More framework support for TransferBuffers

src/gpu/gl/GrGLGpu.cpp

Index: src/gpu/gl/GrGLGpu.cpp
diff --git a/src/gpu/gl/GrGLGpu.cpp b/src/gpu/gl/GrGLGpu.cpp
index f5c646c86fb636161350ae4d28c98096bf7778e7..e149b3b990786e7ec1621c176d451c34a5ea3627 100644
--- a/src/gpu/gl/GrGLGpu.cpp
+++ b/src/gpu/gl/GrGLGpu.cpp
@@ -1,3381 +1,3436 @@
-/*
- * Copyright 2011 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-
-#include "GrGLGpu.h"
-#include "GrGLGLSL.h"
-#include "GrGLStencilAttachment.h"
-#include "GrGLTextureRenderTarget.h"
-#include "GrGpuResourcePriv.h"
-#include "GrPipeline.h"
-#include "GrRenderTargetPriv.h"
-#include "GrSurfacePriv.h"
-#include "GrTexturePriv.h"
-#include "GrTypes.h"
-#include "GrVertices.h"
-#include "builders/GrGLShaderStringBuilder.h"
-#include "glsl/GrGLSL.h"
-#include "glsl/GrGLSLCaps.h"
-#include "SkStrokeRec.h"
-#include "SkTemplates.h"
-
-#define GL_CALL(X) GR_GL_CALL(this->glInterface(), X)
-#define GL_CALL_RET(RET, X) GR_GL_CALL_RET(this->glInterface(), RET, X)
-
-#define SKIP_CACHE_CHECK    true
-
-#if GR_GL_CHECK_ALLOC_WITH_GET_ERROR
-    #define CLEAR_ERROR_BEFORE_ALLOC(iface)   GrGLClearErr(iface)
-    #define GL_ALLOC_CALL(iface, call)        GR_GL_CALL_NOERRCHECK(iface, call)
-    #define CHECK_ALLOC_ERROR(iface)          GR_GL_GET_ERROR(iface)
-#else
-    #define CLEAR_ERROR_BEFORE_ALLOC(iface)
-    #define GL_ALLOC_CALL(iface, call)        GR_GL_CALL(iface, call)
-    #define CHECK_ALLOC_ERROR(iface)          GR_GL_NO_ERROR
-#endif
-
-
-///////////////////////////////////////////////////////////////////////////////
-
-
-static const GrGLenum gXfermodeEquation2Blend[] = {
-    // Basic OpenGL blend equations.
-    GR_GL_FUNC_ADD,
-    GR_GL_FUNC_SUBTRACT,
-    GR_GL_FUNC_REVERSE_SUBTRACT,
-
-    // GL_KHR_blend_equation_advanced.
-    GR_GL_SCREEN,
-    GR_GL_OVERLAY,
-    GR_GL_DARKEN,
-    GR_GL_LIGHTEN,
-    GR_GL_COLORDODGE,
-    GR_GL_COLORBURN,
-    GR_GL_HARDLIGHT,
-    GR_GL_SOFTLIGHT,
-    GR_GL_DIFFERENCE,
-    GR_GL_EXCLUSION,
-    GR_GL_MULTIPLY,
-    GR_GL_HSL_HUE,
-    GR_GL_HSL_SATURATION,
-    GR_GL_HSL_COLOR,
-    GR_GL_HSL_LUMINOSITY
-};
-GR_STATIC_ASSERT(0 == kAdd_GrBlendEquation);
-GR_STATIC_ASSERT(1 == kSubtract_GrBlendEquation);
-GR_STATIC_ASSERT(2 == kReverseSubtract_GrBlendEquation);
-GR_STATIC_ASSERT(3 == kScreen_GrBlendEquation);
-GR_STATIC_ASSERT(4 == kOverlay_GrBlendEquation);
-GR_STATIC_ASSERT(5 == kDarken_GrBlendEquation);
-GR_STATIC_ASSERT(6 == kLighten_GrBlendEquation);
-GR_STATIC_ASSERT(7 == kColorDodge_GrBlendEquation);
-GR_STATIC_ASSERT(8 == kColorBurn_GrBlendEquation);
-GR_STATIC_ASSERT(9 == kHardLight_GrBlendEquation);
-GR_STATIC_ASSERT(10 == kSoftLight_GrBlendEquation);
-GR_STATIC_ASSERT(11 == kDifference_GrBlendEquation);
-GR_STATIC_ASSERT(12 == kExclusion_GrBlendEquation);
-GR_STATIC_ASSERT(13 == kMultiply_GrBlendEquation);
-GR_STATIC_ASSERT(14 == kHSLHue_GrBlendEquation);
-GR_STATIC_ASSERT(15 == kHSLSaturation_GrBlendEquation);
-GR_STATIC_ASSERT(16 == kHSLColor_GrBlendEquation);
-GR_STATIC_ASSERT(17 == kHSLLuminosity_GrBlendEquation);
-GR_STATIC_ASSERT(SK_ARRAY_COUNT(gXfermodeEquation2Blend) == kGrBlendEquationCnt);
-
-static const GrGLenum gXfermodeCoeff2Blend[] = {
-    GR_GL_ZERO,
-    GR_GL_ONE,
-    GR_GL_SRC_COLOR,
-    GR_GL_ONE_MINUS_SRC_COLOR,
-    GR_GL_DST_COLOR,
-    GR_GL_ONE_MINUS_DST_COLOR,
-    GR_GL_SRC_ALPHA,
-    GR_GL_ONE_MINUS_SRC_ALPHA,
-    GR_GL_DST_ALPHA,
-    GR_GL_ONE_MINUS_DST_ALPHA,
-    GR_GL_CONSTANT_COLOR,
-    GR_GL_ONE_MINUS_CONSTANT_COLOR,
-    GR_GL_CONSTANT_ALPHA,
-    GR_GL_ONE_MINUS_CONSTANT_ALPHA,
-
-    // extended blend coeffs
-    GR_GL_SRC1_COLOR,
-    GR_GL_ONE_MINUS_SRC1_COLOR,
-    GR_GL_SRC1_ALPHA,
-    GR_GL_ONE_MINUS_SRC1_ALPHA,
-};
-
-bool GrGLGpu::BlendCoeffReferencesConstant(GrBlendCoeff coeff) {
-    static const bool gCoeffReferencesBlendConst[] = {
-        false,
-        false,
-        false,
-        false,
-        false,
-        false,
-        false,
-        false,
-        false,
-        false,
-        true,
-        true,
-        true,
-        true,
-
-        // extended blend coeffs
-        false,
-        false,
-        false,
-        false,
-    };
-    return gCoeffReferencesBlendConst[coeff];
-    GR_STATIC_ASSERT(kGrBlendCoeffCnt == SK_ARRAY_COUNT(gCoeffReferencesBlendConst));
-
-    GR_STATIC_ASSERT(0 == kZero_GrBlendCoeff);
-    GR_STATIC_ASSERT(1 == kOne_GrBlendCoeff);
-    GR_STATIC_ASSERT(2 == kSC_GrBlendCoeff);
-    GR_STATIC_ASSERT(3 == kISC_GrBlendCoeff);
-    GR_STATIC_ASSERT(4 == kDC_GrBlendCoeff);
-    GR_STATIC_ASSERT(5 == kIDC_GrBlendCoeff);
-    GR_STATIC_ASSERT(6 == kSA_GrBlendCoeff);
-    GR_STATIC_ASSERT(7 == kISA_GrBlendCoeff);
-    GR_STATIC_ASSERT(8 == kDA_GrBlendCoeff);
-    GR_STATIC_ASSERT(9 == kIDA_GrBlendCoeff);
-    GR_STATIC_ASSERT(10 == kConstC_GrBlendCoeff);
-    GR_STATIC_ASSERT(11 == kIConstC_GrBlendCoeff);
-    GR_STATIC_ASSERT(12 == kConstA_GrBlendCoeff);
-    GR_STATIC_ASSERT(13 == kIConstA_GrBlendCoeff);
-
-    GR_STATIC_ASSERT(14 == kS2C_GrBlendCoeff);
-    GR_STATIC_ASSERT(15 == kIS2C_GrBlendCoeff);
-    GR_STATIC_ASSERT(16 == kS2A_GrBlendCoeff);
-    GR_STATIC_ASSERT(17 == kIS2A_GrBlendCoeff);
-
-    // assertion for gXfermodeCoeff2Blend have to be in GrGpu scope
-    GR_STATIC_ASSERT(kGrBlendCoeffCnt == SK_ARRAY_COUNT(gXfermodeCoeff2Blend));
-}
-
-///////////////////////////////////////////////////////////////////////////////
-
-
-GrGpu* GrGLGpu::Create(GrBackendContext backendContext, const GrContextOptions& options,
-                       GrContext* context) {
-    SkAutoTUnref<const GrGLInterface> glInterface(
-        reinterpret_cast<const GrGLInterface*>(backendContext));
-    if (!glInterface) {
-        glInterface.reset(GrGLDefaultInterface());
-    } else {
-        glInterface->ref();
-    }
-    if (!glInterface) {
-        return nullptr;
-    }
-    GrGLContext* glContext = GrGLContext::Create(glInterface, options);
-    if (glContext) {
-        return new GrGLGpu(glContext, context);
-    }
-    return nullptr;
-}
-
-static bool gPrintStartupSpew;
-
-GrGLGpu::GrGLGpu(GrGLContext* ctx, GrContext* context)
-    : GrGpu(context)
-    , fGLContext(ctx) {
-    SkASSERT(ctx);
-    fCaps.reset(SkRef(ctx->caps()));
-
-    fHWBoundTextureUniqueIDs.reset(this->glCaps().maxFragmentTextureUnits());
-
-    GrGLClearErr(this->glInterface());
-    if (gPrintStartupSpew) {
-        const GrGLubyte* vendor;
-        const GrGLubyte* renderer;
-        const GrGLubyte* version;
-        GL_CALL_RET(vendor, GetString(GR_GL_VENDOR));
-        GL_CALL_RET(renderer, GetString(GR_GL_RENDERER));
-        GL_CALL_RET(version, GetString(GR_GL_VERSION));
-        SkDebugf("------------------------- create GrGLGpu %p --------------\n",
-                 this);
-        SkDebugf("------ VENDOR %s\n", vendor);
-        SkDebugf("------ RENDERER %s\n", renderer);
-        SkDebugf("------ VERSION %s\n",  version);
-        SkDebugf("------ EXTENSIONS\n");
-        this->glContext().extensions().print();
-        SkDebugf("\n");
-        SkDebugf("%s", this->glCaps().dump().c_str());
-    }
-
-    fProgramCache = new ProgramCache(this);
-
-    SkASSERT(this->glCaps().maxVertexAttributes() >= GrGeometryProcessor::kMaxVertexAttribs);
-
-    fHWProgramID = 0;
-    fTempSrcFBOID = 0;
-    fTempDstFBOID = 0;
-    fStencilClearFBOID = 0;
-
-    if (this->glCaps().shaderCaps()->pathRenderingSupport()) {
-        fPathRendering.reset(new GrGLPathRendering(this));
-    }
-    this->createCopyPrograms();
-    fWireRectProgram.fProgram = 0;
-    fWireRectArrayBuffer = 0;
-}
-
-GrGLGpu::~GrGLGpu() {
-    if (0 != fHWProgramID) {
-        // detach the current program so there is no confusion on OpenGL's part
-        // that we want it to be deleted
-        GL_CALL(UseProgram(0));
-    }
-
-    if (0 != fTempSrcFBOID) {
-        GL_CALL(DeleteFramebuffers(1, &fTempSrcFBOID));
-    }
-    if (0 != fTempDstFBOID) {
-        GL_CALL(DeleteFramebuffers(1, &fTempDstFBOID));
-    }
-    if (0 != fStencilClearFBOID) {
-        GL_CALL(DeleteFramebuffers(1, &fStencilClearFBOID));
-    }
-
-    for (size_t i = 0; i < SK_ARRAY_COUNT(fCopyPrograms); ++i) {
-        if (0 != fCopyPrograms[i].fProgram) {
-            GL_CALL(DeleteProgram(fCopyPrograms[i].fProgram));
-        }
-    }
-
-    if (0 != fCopyProgramArrayBuffer) {
-        GL_CALL(DeleteBuffers(1, &fCopyProgramArrayBuffer));
-    }
-
-    if (0 != fWireRectProgram.fProgram) {
-        GL_CALL(DeleteProgram(fWireRectProgram.fProgram));
-    }
-
-    if (0 != fWireRectArrayBuffer) {
-        GL_CALL(DeleteBuffers(1, &fWireRectArrayBuffer));
-    }
-
-    delete fProgramCache;
-}
-
-void GrGLGpu::contextAbandoned() {
-    INHERITED::contextAbandoned();
-    fProgramCache->abandon();
-    fHWProgramID = 0;
-    fTempSrcFBOID = 0;
-    fTempDstFBOID = 0;
-    fStencilClearFBOID = 0;
-    fCopyProgramArrayBuffer = 0;
-    for (size_t i = 0; i < SK_ARRAY_COUNT(fCopyPrograms); ++i) {
-        fCopyPrograms[i].fProgram = 0;
-    }
-    fWireRectProgram.fProgram = 0;
-    fWireRectArrayBuffer = 0;
-    if (this->glCaps().shaderCaps()->pathRenderingSupport()) {
-        this->glPathRendering()->abandonGpuResources();
-    }
-}
-
-///////////////////////////////////////////////////////////////////////////////
-
-void GrGLGpu::onResetContext(uint32_t resetBits) {
-    // we don't use the zb at all
-    if (resetBits & kMisc_GrGLBackendState) {
-        GL_CALL(Disable(GR_GL_DEPTH_TEST));
-        GL_CALL(DepthMask(GR_GL_FALSE));
-
-        fHWDrawFace = GrPipelineBuilder::kInvalid_DrawFace;
-
-        if (kGL_GrGLStandard == this->glStandard()) {
-            // Desktop-only state that we never change
-            if (!this->glCaps().isCoreProfile()) {
-                GL_CALL(Disable(GR_GL_POINT_SMOOTH));
-                GL_CALL(Disable(GR_GL_LINE_SMOOTH));
-                GL_CALL(Disable(GR_GL_POLYGON_SMOOTH));
-                GL_CALL(Disable(GR_GL_POLYGON_STIPPLE));
-                GL_CALL(Disable(GR_GL_COLOR_LOGIC_OP));
-                GL_CALL(Disable(GR_GL_INDEX_LOGIC_OP));
-            }
-            // The windows NVIDIA driver has GL_ARB_imaging in the extension string when using a
-            // core profile. This seems like a bug since the core spec removes any mention of
-            // GL_ARB_imaging.
-            if (this->glCaps().imagingSupport() && !this->glCaps().isCoreProfile()) {
-                GL_CALL(Disable(GR_GL_COLOR_TABLE));
-            }
-            GL_CALL(Disable(GR_GL_POLYGON_OFFSET_FILL));
-            // Since ES doesn't support glPointSize at all we always use the VS to
-            // set the point size
-            GL_CALL(Enable(GR_GL_VERTEX_PROGRAM_POINT_SIZE));
-
-            // We should set glPolygonMode(FRONT_AND_BACK,FILL) here, too. It isn't
-            // currently part of our gl interface. There are probably others as
-            // well.
-        }
-
-        if (kGLES_GrGLStandard == this->glStandard() &&
-                this->hasExtension("GL_ARM_shader_framebuffer_fetch")) {
-            // The arm extension requires specifically enabling MSAA fetching per sample.
-            // On some devices this may have a perf hit.  Also multiple render targets are disabled
-            GL_CALL(Enable(GR_GL_FETCH_PER_SAMPLE_ARM));
-        }
-        fHWWriteToColor = kUnknown_TriState;
-        // we only ever use lines in hairline mode
-        GL_CALL(LineWidth(1));
-        GL_CALL(Disable(GR_GL_DITHER));
-    }
-
-    if (resetBits & kMSAAEnable_GrGLBackendState) {
-        fMSAAEnabled = kUnknown_TriState;
-
-        // In mixed samples mode coverage modulation allows the coverage to be converted to
-        // "opacity", which can then be blended into the color buffer to accomplish antialiasing.
-        // Enable coverage modulation suitable for premultiplied alpha colors.
-        // This state has no effect when not rendering to a mixed sampled target.
-        if (this->caps()->mixedSamplesSupport()) {
-            GL_CALL(CoverageModulation(GR_GL_RGBA));
-        }
-    }
-
-    fHWActiveTextureUnitIdx = -1; // invalid
-
-    if (resetBits & kTextureBinding_GrGLBackendState) {
-        for (int s = 0; s < fHWBoundTextureUniqueIDs.count(); ++s) {
-            fHWBoundTextureUniqueIDs[s] = SK_InvalidUniqueID;
-        }
-    }
-
-    if (resetBits & kBlend_GrGLBackendState) {
-        fHWBlendState.invalidate();
-    }
-
-    if (resetBits & kView_GrGLBackendState) {
-        fHWScissorSettings.invalidate();
-        fHWViewport.invalidate();
-    }
-
-    if (resetBits & kStencil_GrGLBackendState) {
-        fHWStencilSettings.invalidate();
-        fHWStencilTestEnabled = kUnknown_TriState;
-    }
-
-    // Vertex
-    if (resetBits & kVertex_GrGLBackendState) {
-        fHWGeometryState.invalidate();
-    }
-
-    if (resetBits & kRenderTarget_GrGLBackendState) {
-        fHWBoundRenderTargetUniqueID = SK_InvalidUniqueID;
-        fHWSRGBFramebuffer = kUnknown_TriState;
-    }
-
-    if (resetBits & kPathRendering_GrGLBackendState) {
-        if (this->caps()->shaderCaps()->pathRenderingSupport()) {
-            this->glPathRendering()->resetContext();
-        }
-    }
-
-    // we assume these values
-    if (resetBits & kPixelStore_GrGLBackendState) {
-        if (this->glCaps().unpackRowLengthSupport()) {
-            GL_CALL(PixelStorei(GR_GL_UNPACK_ROW_LENGTH, 0));
-        }
-        if (this->glCaps().packRowLengthSupport()) {
-            GL_CALL(PixelStorei(GR_GL_PACK_ROW_LENGTH, 0));
-        }
-        if (this->glCaps().unpackFlipYSupport()) {
-            GL_CALL(PixelStorei(GR_GL_UNPACK_FLIP_Y, GR_GL_FALSE));
-        }
-        if (this->glCaps().packFlipYSupport()) {
-            GL_CALL(PixelStorei(GR_GL_PACK_REVERSE_ROW_ORDER, GR_GL_FALSE));
-        }
-    }
-
-    if (resetBits & kProgram_GrGLBackendState) {
-        fHWProgramID = 0;
-    }
-}
-
-static GrSurfaceOrigin resolve_origin(GrSurfaceOrigin origin, bool renderTarget) {
-    // By default, GrRenderTargets are GL's normal orientation so that they
-    // can be drawn to by the outside world without the client having
-    // to render upside down.
-    if (kDefault_GrSurfaceOrigin == origin) {
-        return renderTarget ? kBottomLeft_GrSurfaceOrigin : kTopLeft_GrSurfaceOrigin;
-    } else {
-        return origin;
-    }
-}
-
-GrTexture* GrGLGpu::onWrapBackendTexture(const GrBackendTextureDesc& desc,
-                                         GrWrapOwnership ownership) {
-#ifdef SK_IGNORE_GL_TEXTURE_TARGET
-    if (!desc.fTextureHandle) {
-        return nullptr;
-    }
-#else
-    const GrGLTextureInfo* info = reinterpret_cast<const GrGLTextureInfo*>(desc.fTextureHandle);
-    if (!info || !info->fID) {
-        return nullptr;
-    }
-#endif
-
-    int maxSize = this->caps()->maxTextureSize();
-    if (desc.fWidth > maxSize || desc.fHeight > maxSize) {
-        return nullptr;
-    }
-
-    // next line relies on GrBackendTextureDesc's flags matching GrTexture's
-    bool renderTarget = SkToBool(desc.fFlags & kRenderTarget_GrBackendTextureFlag);
-
-    GrGLTexture::IDDesc idDesc;
-    GrSurfaceDesc surfDesc;
-
-#ifdef SK_IGNORE_GL_TEXTURE_TARGET
-    idDesc.fInfo.fID = static_cast<GrGLuint>(desc.fTextureHandle);
-    // We only support GL_TEXTURE_2D at the moment.
-    idDesc.fInfo.fTarget = GR_GL_TEXTURE_2D;
-#else
-    idDesc.fInfo = *info;
-#endif
-    if (GR_GL_TEXTURE_EXTERNAL == idDesc.fInfo.fTarget) {
-        if (renderTarget) {
-            // This combination is not supported.
-            return nullptr;
-        }
-        if (!this->glCaps().externalTextureSupport()) {
-            return nullptr;
-        }
-    }
-    // Sample count is interpretted to mean the number of samples that Gr code should allocate
-    // for a render buffer that resolves to the texture. We don't support MSAA textures.
-    if (desc.fSampleCnt && !renderTarget) {
-        return nullptr;
-    }
-
-    switch (ownership) {
-        case kAdopt_GrWrapOwnership:
-            idDesc.fLifeCycle = GrGpuResource::kAdopted_LifeCycle;
-            break;
-        case kBorrow_GrWrapOwnership:
-            idDesc.fLifeCycle = GrGpuResource::kBorrowed_LifeCycle;
-            break;
-    }    
-
-    surfDesc.fFlags = (GrSurfaceFlags) desc.fFlags;
-    surfDesc.fWidth = desc.fWidth;
-    surfDesc.fHeight = desc.fHeight;
-    surfDesc.fConfig = desc.fConfig;
-    surfDesc.fSampleCnt = SkTMin(desc.fSampleCnt, this->caps()->maxSampleCount());
-    // FIXME:  this should be calling resolve_origin(), but Chrome code is currently
-    // assuming the old behaviour, which is that backend textures are always
-    // BottomLeft, even for non-RT's.  Once Chrome is fixed, change this to:
-    // glTexDesc.fOrigin = resolve_origin(desc.fOrigin, renderTarget);
-    if (kDefault_GrSurfaceOrigin == desc.fOrigin) {
-        surfDesc.fOrigin = kBottomLeft_GrSurfaceOrigin;
-    } else {
-        surfDesc.fOrigin = desc.fOrigin;
-    }
-
-    GrGLTexture* texture = nullptr;
-    if (renderTarget) {
-        GrGLRenderTarget::IDDesc rtIDDesc;
-        if (!this->createRenderTargetObjects(surfDesc, GrGpuResource::kUncached_LifeCycle,
-                                             idDesc.fInfo, &rtIDDesc)) {
-            return nullptr;
-        }
-        texture = new GrGLTextureRenderTarget(this, surfDesc, idDesc, rtIDDesc);
-    } else {
-        texture = new GrGLTexture(this, surfDesc, idDesc);
-    }
-    if (nullptr == texture) {
-        return nullptr;
-    }
-
-    return texture;
-}
-
-GrRenderTarget* GrGLGpu::onWrapBackendRenderTarget(const GrBackendRenderTargetDesc& wrapDesc,
-                                                   GrWrapOwnership ownership) {
-    GrGLRenderTarget::IDDesc idDesc;
-    idDesc.fRTFBOID = static_cast<GrGLuint>(wrapDesc.fRenderTargetHandle);
-    idDesc.fMSColorRenderbufferID = 0;
-    idDesc.fTexFBOID = GrGLRenderTarget::kUnresolvableFBOID;
-    switch (ownership) {
-        case kAdopt_GrWrapOwnership:
-            idDesc.fLifeCycle = GrGpuResource::kAdopted_LifeCycle;
-            break;
-        case kBorrow_GrWrapOwnership:
-            idDesc.fLifeCycle = GrGpuResource::kBorrowed_LifeCycle;
-            break;
-    }    
-    idDesc.fSampleConfig = GrRenderTarget::kUnified_SampleConfig;
-
-    GrSurfaceDesc desc;
-    desc.fConfig = wrapDesc.fConfig;
-    desc.fFlags = kCheckAllocation_GrSurfaceFlag | kRenderTarget_GrSurfaceFlag;
-    desc.fWidth = wrapDesc.fWidth;
-    desc.fHeight = wrapDesc.fHeight;
-    desc.fSampleCnt = SkTMin(wrapDesc.fSampleCnt, this->caps()->maxSampleCount());
-    desc.fOrigin = resolve_origin(wrapDesc.fOrigin, true);
-
-    return GrGLRenderTarget::CreateWrapped(this, desc, idDesc, wrapDesc.fStencilBits);
-}
-
-////////////////////////////////////////////////////////////////////////////////
-bool GrGLGpu::onGetWritePixelsInfo(GrSurface* dstSurface, int width, int height,
-                                   size_t rowBytes, GrPixelConfig srcConfig,
-                                   DrawPreference* drawPreference,
-                                   WritePixelTempDrawInfo* tempDrawInfo) {
-    if (kIndex_8_GrPixelConfig == srcConfig || GrPixelConfigIsCompressed(dstSurface->config())) {
-        return false;
-    }
-
-    // This subclass only allows writes to textures. If the dst is not a texture we have to draw
-    // into it. We could use glDrawPixels on GLs that have it, but we don't today.
-    if (!dstSurface->asTexture()) {
-        ElevateDrawPreference(drawPreference, kRequireDraw_DrawPreference);
-    } else {
-        GrGLTexture* texture = static_cast<GrGLTexture*>(dstSurface->asTexture());
-        if (GR_GL_TEXTURE_2D != texture->target()) {
-             // We don't currently support writing pixels to non-TEXTURE_2D textures.
-             return false;
-        }
-    }
-
-    if (GrPixelConfigIsSRGB(dstSurface->config()) != GrPixelConfigIsSRGB(srcConfig)) {
-        ElevateDrawPreference(drawPreference, kRequireDraw_DrawPreference);
-    }
-
-    tempDrawInfo->fSwapRAndB = false;
-
-    // These settings we will always want if a temp draw is performed. Initially set the config
-    // to srcConfig, though that may be modified if we decide to do a R/G swap.
-    tempDrawInfo->fTempSurfaceDesc.fFlags = kNone_GrSurfaceFlags;
-    tempDrawInfo->fTempSurfaceDesc.fConfig = srcConfig;
-    tempDrawInfo->fTempSurfaceDesc.fWidth = width;
-    tempDrawInfo->fTempSurfaceDesc.fHeight = height;
-    tempDrawInfo->fTempSurfaceDesc.fSampleCnt = 0;
-    tempDrawInfo->fTempSurfaceDesc.fOrigin = kTopLeft_GrSurfaceOrigin; // no CPU y-flip for TL.
-
-    bool configsAreRBSwaps = GrPixelConfigSwapRAndB(srcConfig) == dstSurface->config();
-
-    if (configsAreRBSwaps) {
-        if (!this->caps()->isConfigTexturable(srcConfig)) {
-            ElevateDrawPreference(drawPreference, kRequireDraw_DrawPreference);
-            tempDrawInfo->fTempSurfaceDesc.fConfig = dstSurface->config();
-            tempDrawInfo->fSwapRAndB = true;
-        } else if (this->glCaps().rgba8888PixelsOpsAreSlow() &&
-                   kRGBA_8888_GrPixelConfig == srcConfig) {
-            ElevateDrawPreference(drawPreference, kGpuPrefersDraw_DrawPreference);
-            tempDrawInfo->fTempSurfaceDesc.fConfig = dstSurface->config();
-            tempDrawInfo->fSwapRAndB = true;
-        } else if (kGLES_GrGLStandard == this->glStandard() &&
-                   this->glCaps().bgraIsInternalFormat()) {
-            // The internal format and external formats must match texture uploads so we can't
-            // swizzle while uploading when BGRA is a distinct internal format.
-            ElevateDrawPreference(drawPreference, kRequireDraw_DrawPreference);
-            tempDrawInfo->fTempSurfaceDesc.fConfig = dstSurface->config();
-            tempDrawInfo->fSwapRAndB = true;
-        }
-    }
-
-    if (!this->glCaps().unpackFlipYSupport() &&
-        kBottomLeft_GrSurfaceOrigin == dstSurface->origin()) {
-        ElevateDrawPreference(drawPreference, kGpuPrefersDraw_DrawPreference);
-    }
-
-    return true;
-}
-
-bool GrGLGpu::onWritePixels(GrSurface* surface,
-                            int left, int top, int width, int height,
-                            GrPixelConfig config, const void* buffer,
-                            size_t rowBytes) {
-    GrGLTexture* glTex = static_cast<GrGLTexture*>(surface->asTexture());
-    if (!glTex) {
-        return false;
-    }
-
-    // OpenGL doesn't do sRGB <-> linear conversions when reading and writing pixels.
-    if (GrPixelConfigIsSRGB(surface->config()) != GrPixelConfigIsSRGB(config)) {
-        return false;
-    }
-
-    // Write pixels is only implemented for TEXTURE_2D textures
-    if (GR_GL_TEXTURE_2D != glTex->target()) {
-        return false;
-    }
-
-    this->setScratchTextureUnit();
-    GL_CALL(BindTexture(glTex->target(), glTex->textureID()));
-
-    bool success = false;
-    if (GrPixelConfigIsCompressed(glTex->desc().fConfig)) {
-        // We check that config == desc.fConfig in GrGLGpu::canWriteTexturePixels()
-        SkASSERT(config == glTex->desc().fConfig);
-        success = this->uploadCompressedTexData(glTex->desc(), glTex->target(), buffer, false, left,
-                                                top, width, height);
-    } else {
-        success = this->uploadTexData(glTex->desc(), glTex->target(), false, left, top, width,
-                                      height, config, buffer, rowBytes);
-    }
-
-    if (success) {
-        glTex->texturePriv().dirtyMipMaps(true);
-        return true;
-    }
-
-    return false;
-}
-
-// For GL_[UN]PACK_ALIGNMENT.
-static inline GrGLint config_alignment(GrPixelConfig config) {
-    SkASSERT(!GrPixelConfigIsCompressed(config));
-    switch (config) {
-        case kAlpha_8_GrPixelConfig:
-            return 1;
-        case kRGB_565_GrPixelConfig:
-        case kRGBA_4444_GrPixelConfig:
-        case kAlpha_half_GrPixelConfig:
-        case kRGBA_half_GrPixelConfig:
-            return 2;
-        case kRGBA_8888_GrPixelConfig:
-        case kBGRA_8888_GrPixelConfig:
-        case kSRGBA_8888_GrPixelConfig:
-        case kRGBA_float_GrPixelConfig:
-            return 4;
-        default:
-            return 0;
-    }
-}
-
-static inline GrGLenum check_alloc_error(const GrSurfaceDesc& desc,
-                                         const GrGLInterface* interface) {
-    if (SkToBool(desc.fFlags & kCheckAllocation_GrSurfaceFlag)) {
-        return GR_GL_GET_ERROR(interface);
-    } else {
-        return CHECK_ALLOC_ERROR(interface);
-    }
-}
-
-bool GrGLGpu::uploadTexData(const GrSurfaceDesc& desc,
-                            GrGLenum target,
-                            bool isNewTexture,
-                            int left, int top, int width, int height,
-                            GrPixelConfig dataConfig,
-                            const void* data,
-                            size_t rowBytes) {
-    SkASSERT(data || isNewTexture);
-
-    // If we're uploading compressed data then we should be using uploadCompressedTexData
-    SkASSERT(!GrPixelConfigIsCompressed(dataConfig));
-
-    SkASSERT(this->caps()->isConfigTexturable(desc.fConfig));
-
-    size_t bpp = GrBytesPerPixel(dataConfig);
-    if (!GrSurfacePriv::AdjustWritePixelParams(desc.fWidth, desc.fHeight, bpp, &left, &top,
-                                               &width, &height, &data, &rowBytes)) {
-        return false;
-    }
-    size_t trimRowBytes = width * bpp;
-
-    // in case we need a temporary, trimmed copy of the src pixels
-#if defined(GOOGLE3)
-    // Stack frame size is limited in GOOGLE3.
-    SkAutoSMalloc<64 * 128> tempStorage;
-#else
-    SkAutoSMalloc<128 * 128> tempStorage;
-#endif
-
-    // Internal format comes from the texture desc.
-    GrGLenum internalFormat =
-        this->glCaps().configGLFormats(desc.fConfig).fInternalFormatTexImage;
-
-    // External format and type come from the upload data.
-    GrGLenum externalFormat =
-        this->glCaps().configGLFormats(dataConfig).fExternalFormatForTexImage;
-    GrGLenum externalType = this->glCaps().configGLFormats(dataConfig).fExternalType;
-
-    /*
-     *  Check whether to allocate a temporary buffer for flipping y or
-     *  because our srcData has extra bytes past each row. If so, we need
-     *  to trim those off here, since GL ES may not let us specify
-     *  GL_UNPACK_ROW_LENGTH.
-     */
-    bool restoreGLRowLength = false;
-    bool swFlipY = false;
-    bool glFlipY = false;
-    if (data) {
-        if (kBottomLeft_GrSurfaceOrigin == desc.fOrigin) {
-            if (this->glCaps().unpackFlipYSupport()) {
-                glFlipY = true;
-            } else {
-                swFlipY = true;
-            }
-        }
-        if (this->glCaps().unpackRowLengthSupport() && !swFlipY) {
-            // can't use this for flipping, only non-neg values allowed. :(
-            if (rowBytes != trimRowBytes) {
-                GrGLint rowLength = static_cast<GrGLint>(rowBytes / bpp);
-                GL_CALL(PixelStorei(GR_GL_UNPACK_ROW_LENGTH, rowLength));
-                restoreGLRowLength = true;
-            }
-        } else {
-            if (trimRowBytes != rowBytes || swFlipY) {
-                // copy data into our new storage, skipping the trailing bytes
-                size_t trimSize = height * trimRowBytes;
-                const char* src = (const char*)data;
-                if (swFlipY) {
-                    src += (height - 1) * rowBytes;
-                }
-                char* dst = (char*)tempStorage.reset(trimSize);
-                for (int y = 0; y < height; y++) {
-                    memcpy(dst, src, trimRowBytes);
-                    if (swFlipY) {
-                        src -= rowBytes;
-                    } else {
-                        src += rowBytes;
-                    }
-                    dst += trimRowBytes;
-                }
-                // now point data to our copied version
-                data = tempStorage.get();
-            }
-        }
-        if (glFlipY) {
-            GL_CALL(PixelStorei(GR_GL_UNPACK_FLIP_Y, GR_GL_TRUE));
-        }
-        GL_CALL(PixelStorei(GR_GL_UNPACK_ALIGNMENT, config_alignment(dataConfig)));
-    }
-    bool succeeded = true;
-    if (isNewTexture) {
-        if (data && !(0 == left && 0 == top && desc.fWidth == width && desc.fHeight == height)) {
-            succeeded = false;
-        } else {
-            CLEAR_ERROR_BEFORE_ALLOC(this->glInterface());
-            GL_ALLOC_CALL(this->glInterface(), TexImage2D(target, 0, internalFormat, desc.fWidth,
-                                                          desc.fHeight, 0,  externalFormat,
-                                                          externalType, data));
-            GrGLenum error = check_alloc_error(desc, this->glInterface());
-            if (error != GR_GL_NO_ERROR) {
-                succeeded = false;
-            }
-        }
-    } else {
-        if (swFlipY || glFlipY) {
-            top = desc.fHeight - (top + height);
-        }
-        GL_CALL(TexSubImage2D(target,
-                              0, // level
-                              left, top,
-                              width, height,
-                              externalFormat, externalType, data));
-    }
-
-    if (restoreGLRowLength) {
-        SkASSERT(this->glCaps().unpackRowLengthSupport());
-        GL_CALL(PixelStorei(GR_GL_UNPACK_ROW_LENGTH, 0));
-    }
-    if (glFlipY) {
-        GL_CALL(PixelStorei(GR_GL_UNPACK_FLIP_Y, GR_GL_FALSE));
-    }
-    return succeeded;
-}
-
-// TODO: This function is using a lot of wonky semantics like, if width == -1
-// then set width = desc.fWdith ... blah. A better way to do it might be to
-// create a CompressedTexData struct that takes a desc/ptr and figures out
-// the proper upload semantics. Then users can construct this function how they
-// see fit if they want to go against the "standard" way to do it.
-bool GrGLGpu::uploadCompressedTexData(const GrSurfaceDesc& desc,
-                                      GrGLenum target,
-                                      const void* data,
-                                      bool isNewTexture,
-                                      int left, int top, int width, int height) {
-    SkASSERT(this->caps()->isConfigTexturable(desc.fConfig));
-    SkASSERT(data || isNewTexture);
-
-    // No support for software flip y, yet...
-    SkASSERT(kBottomLeft_GrSurfaceOrigin != desc.fOrigin);
-
-    if (-1 == width) {
-        width = desc.fWidth;
-    }
-#ifdef SK_DEBUG
-    else {
-        SkASSERT(width <= desc.fWidth);
-    }
-#endif
-
-    if (-1 == height) {
-        height = desc.fHeight;
-    }
-#ifdef SK_DEBUG
-    else {
-        SkASSERT(height <= desc.fHeight);
-    }
-#endif
-
-    // Make sure that the width and height that we pass to OpenGL
-    // is a multiple of the block size.
-    size_t dataSize = GrCompressedFormatDataSize(desc.fConfig, width, height);
-
-    // We only need the internal format for compressed 2D textures. There is on
-    // sized vs base internal format distinction for compressed textures.
-    GrGLenum internalFormat =this->glCaps().configGLFormats(desc.fConfig).fSizedInternalFormat;
-
-    if (isNewTexture) {
-        CLEAR_ERROR_BEFORE_ALLOC(this->glInterface());
-        GL_ALLOC_CALL(this->glInterface(),
-                      CompressedTexImage2D(target,
-                                           0, // level
-                                           internalFormat,
-                                           width, height,
-                                           0, // border
-                                           SkToInt(dataSize),
-                                           data));
-        GrGLenum error = check_alloc_error(desc, this->glInterface());
-        if (error != GR_GL_NO_ERROR) {
-            return false;
-        }
-    } else {
-        // Paletted textures can't be updated.
-        if (GR_GL_PALETTE8_RGBA8 == internalFormat) {
-            return false;
-        }
-        GL_CALL(CompressedTexSubImage2D(target,
-                                        0, // level
-                                        left, top,
-                                        width, height,
-                                        internalFormat,
-                                        SkToInt(dataSize),
-                                        data));
-    }
-
-    return true;
-}
-
-static bool renderbuffer_storage_msaa(const GrGLContext& ctx,
-                                      int sampleCount,
-                                      GrGLenum format,
-                                      int width, int height) {
-    CLEAR_ERROR_BEFORE_ALLOC(ctx.interface());
-    SkASSERT(GrGLCaps::kNone_MSFBOType != ctx.caps()->msFBOType());
-    switch (ctx.caps()->msFBOType()) {
-        case GrGLCaps::kDesktop_ARB_MSFBOType:
-        case GrGLCaps::kDesktop_EXT_MSFBOType:
-        case GrGLCaps::kMixedSamples_MSFBOType:
-        case GrGLCaps::kES_3_0_MSFBOType:
-            GL_ALLOC_CALL(ctx.interface(),
-                            RenderbufferStorageMultisample(GR_GL_RENDERBUFFER,
-                                                            sampleCount,
-                                                            format,
-                                                            width, height));
-            break;
-        case GrGLCaps::kES_Apple_MSFBOType:
-            GL_ALLOC_CALL(ctx.interface(),
-                            RenderbufferStorageMultisampleES2APPLE(GR_GL_RENDERBUFFER,
-                                                                    sampleCount,
-                                                                    format,
-                                                                    width, height));
-            break;
-        case GrGLCaps::kES_EXT_MsToTexture_MSFBOType:
-        case GrGLCaps::kES_IMG_MsToTexture_MSFBOType:
-            GL_ALLOC_CALL(ctx.interface(),
-                            RenderbufferStorageMultisampleES2EXT(GR_GL_RENDERBUFFER,
-                                                                sampleCount,
-                                                                format,
-                                                                width, height));
-            break;
-        case GrGLCaps::kNone_MSFBOType:
-            SkFAIL("Shouldn't be here if we don't support multisampled renderbuffers.");
-            break;
-    }
-    return (GR_GL_NO_ERROR == CHECK_ALLOC_ERROR(ctx.interface()));
-}
-
-bool GrGLGpu::createRenderTargetObjects(const GrSurfaceDesc& desc,
-                                        GrGpuResource::LifeCycle lifeCycle,
-                                        const GrGLTextureInfo& texInfo,
-                                        GrGLRenderTarget::IDDesc* idDesc) {
-    idDesc->fMSColorRenderbufferID = 0;
-    idDesc->fRTFBOID = 0;
-    idDesc->fTexFBOID = 0;
-    idDesc->fLifeCycle = lifeCycle;
-    idDesc->fSampleConfig = (GrGLCaps::kMixedSamples_MSFBOType == this->glCaps().msFBOType() &&
-                            desc.fSampleCnt > 0) ? GrRenderTarget::kStencil_SampleConfig :
-                                                   GrRenderTarget::kUnified_SampleConfig;
-
-    GrGLenum status;
-
-    GrGLenum colorRenderbufferFormat = 0; // suppress warning
-
-    if (desc.fSampleCnt > 0 && GrGLCaps::kNone_MSFBOType == this->glCaps().msFBOType()) {
-        goto FAILED;
-    }
-
-    GL_CALL(GenFramebuffers(1, &idDesc->fTexFBOID));
-    if (!idDesc->fTexFBOID) {
-        goto FAILED;
-    }
-
-    // If we are using multisampling we will create two FBOS. We render to one and then resolve to
-    // the texture bound to the other. The exception is the IMG multisample extension. With this
-    // extension the texture is multisampled when rendered to and then auto-resolves it when it is
-    // rendered from.
-    if (desc.fSampleCnt > 0 && this->glCaps().usesMSAARenderBuffers()) {
-        GL_CALL(GenFramebuffers(1, &idDesc->fRTFBOID));
-        GL_CALL(GenRenderbuffers(1, &idDesc->fMSColorRenderbufferID));
-        if (!idDesc->fRTFBOID ||
-            !idDesc->fMSColorRenderbufferID) {
-            goto FAILED;
-        }
-        // All ES versions (thus far) require sized internal formats for render buffers.
-        // TODO: Always use sized internal format?
-        // If this rule gets more complicated, add a field to ConfigEntry rather than logic here.
-        colorRenderbufferFormat = kGLES_GrGLStandard == this->glStandard() ?
-                            this->glCaps().configGLFormats(desc.fConfig).fSizedInternalFormat :
-                            this->glCaps().configGLFormats(desc.fConfig).fBaseInternalFormat;
-    } else {
-        idDesc->fRTFBOID = idDesc->fTexFBOID;
-    }
-
-    // below here we may bind the FBO
-    fHWBoundRenderTargetUniqueID = SK_InvalidUniqueID;
-    if (idDesc->fRTFBOID != idDesc->fTexFBOID) {
-        SkASSERT(desc.fSampleCnt > 0);
-        GL_CALL(BindRenderbuffer(GR_GL_RENDERBUFFER, idDesc->fMSColorRenderbufferID));
-        if (!renderbuffer_storage_msaa(*fGLContext,
-                                       desc.fSampleCnt,
-                                       colorRenderbufferFormat,
-                                       desc.fWidth, desc.fHeight)) {
-            goto FAILED;
-        }
-        fStats.incRenderTargetBinds();
-        GL_CALL(BindFramebuffer(GR_GL_FRAMEBUFFER, idDesc->fRTFBOID));
-        GL_CALL(FramebufferRenderbuffer(GR_GL_FRAMEBUFFER,
-                                        GR_GL_COLOR_ATTACHMENT0,
-                                        GR_GL_RENDERBUFFER,
-                                        idDesc->fMSColorRenderbufferID));
-        if ((desc.fFlags & kCheckAllocation_GrSurfaceFlag) ||
-            !this->glCaps().isConfigVerifiedColorAttachment(desc.fConfig)) {
-            GL_CALL_RET(status, CheckFramebufferStatus(GR_GL_FRAMEBUFFER));
-            if (status != GR_GL_FRAMEBUFFER_COMPLETE) {
-                goto FAILED;
-            }
-            fGLContext->caps()->markConfigAsValidColorAttachment(desc.fConfig);
-        }
-    }
-    fStats.incRenderTargetBinds();
-    GL_CALL(BindFramebuffer(GR_GL_FRAMEBUFFER, idDesc->fTexFBOID));
-
-    if (this->glCaps().usesImplicitMSAAResolve() && desc.fSampleCnt > 0) {
-        GL_CALL(FramebufferTexture2DMultisample(GR_GL_FRAMEBUFFER,
-                                                GR_GL_COLOR_ATTACHMENT0,
-                                                texInfo.fTarget,
-                                                texInfo.fID, 0, desc.fSampleCnt));
-    } else {
-        GL_CALL(FramebufferTexture2D(GR_GL_FRAMEBUFFER,
-                                     GR_GL_COLOR_ATTACHMENT0,
-                                     texInfo.fTarget,
-                                     texInfo.fID, 0));
-    }
-    if ((desc.fFlags & kCheckAllocation_GrSurfaceFlag) ||
-        !this->glCaps().isConfigVerifiedColorAttachment(desc.fConfig)) {
-        GL_CALL_RET(status, CheckFramebufferStatus(GR_GL_FRAMEBUFFER));
-        if (status != GR_GL_FRAMEBUFFER_COMPLETE) {
-            goto FAILED;
-        }
-        fGLContext->caps()->markConfigAsValidColorAttachment(desc.fConfig);
-    }
-
-    return true;
-
-FAILED:
-    if (idDesc->fMSColorRenderbufferID) {
-        GL_CALL(DeleteRenderbuffers(1, &idDesc->fMSColorRenderbufferID));
-    }
-    if (idDesc->fRTFBOID != idDesc->fTexFBOID) {
-        GL_CALL(DeleteFramebuffers(1, &idDesc->fRTFBOID));
-    }
-    if (idDesc->fTexFBOID) {
-        GL_CALL(DeleteFramebuffers(1, &idDesc->fTexFBOID));
-    }
-    return false;
-}
-
-// good to set a break-point here to know when createTexture fails
-static GrTexture* return_null_texture() {
-//    SkDEBUGFAIL("null texture");
-    return nullptr;
-}
-
-#if 0 && defined(SK_DEBUG)
-static size_t as_size_t(int x) {
-    return x;
-}
-#endif
-
-GrTexture* GrGLGpu::onCreateTexture(const GrSurfaceDesc& desc,
-                                    GrGpuResource::LifeCycle lifeCycle,
-                                    const void* srcData, size_t rowBytes) {
-    // We fail if the MSAA was requested and is not available.
-    if (GrGLCaps::kNone_MSFBOType == this->glCaps().msFBOType() && desc.fSampleCnt) {
-        //SkDebugf("MSAA RT requested but not supported on this platform.");
-        return return_null_texture();
-    }
-
-    bool renderTarget = SkToBool(desc.fFlags & kRenderTarget_GrSurfaceFlag);
-
-    GrGLTexture::IDDesc idDesc;
-    idDesc.fInfo.fID = 0;
-    GL_CALL(GenTextures(1, &idDesc.fInfo.fID));
-    idDesc.fLifeCycle = lifeCycle;
-    // We only support GL_TEXTURE_2D at the moment.
-    idDesc.fInfo.fTarget = GR_GL_TEXTURE_2D;
-
-    if (!idDesc.fInfo.fID) {
-        return return_null_texture();
-    }
-
-    this->setScratchTextureUnit();
-    GL_CALL(BindTexture(idDesc.fInfo.fTarget, idDesc.fInfo.fID));
-
-    if (renderTarget && this->glCaps().textureUsageSupport()) {
-        // provides a hint about how this texture will be used
-        GL_CALL(TexParameteri(idDesc.fInfo.fTarget,
-                              GR_GL_TEXTURE_USAGE,
-                              GR_GL_FRAMEBUFFER_ATTACHMENT));
-    }
-
-    // Some drivers like to know filter/wrap before seeing glTexImage2D. Some
-    // drivers have a bug where an FBO won't be complete if it includes a
-    // texture that is not mipmap complete (considering the filter in use).
-    GrGLTexture::TexParams initialTexParams;
-    // we only set a subset here so invalidate first
-    initialTexParams.invalidate();
-    initialTexParams.fMinFilter = GR_GL_NEAREST;
-    initialTexParams.fMagFilter = GR_GL_NEAREST;
-    initialTexParams.fWrapS = GR_GL_CLAMP_TO_EDGE;
-    initialTexParams.fWrapT = GR_GL_CLAMP_TO_EDGE;
-    GL_CALL(TexParameteri(idDesc.fInfo.fTarget,
-                          GR_GL_TEXTURE_MAG_FILTER,
-                          initialTexParams.fMagFilter));
-    GL_CALL(TexParameteri(idDesc.fInfo.fTarget,
-                          GR_GL_TEXTURE_MIN_FILTER,
-                          initialTexParams.fMinFilter));
-    GL_CALL(TexParameteri(idDesc.fInfo.fTarget,
-                          GR_GL_TEXTURE_WRAP_S,
-                          initialTexParams.fWrapS));
-    GL_CALL(TexParameteri(idDesc.fInfo.fTarget,
-                          GR_GL_TEXTURE_WRAP_T,
-                          initialTexParams.fWrapT));
-    if (!this->uploadTexData(desc, idDesc.fInfo.fTarget, true, 0, 0,
-                             desc.fWidth, desc.fHeight,
-                             desc.fConfig, srcData, rowBytes)) {
-        GL_CALL(DeleteTextures(1, &idDesc.fInfo.fID));
-        return return_null_texture();
-    }
-
-    GrGLTexture* tex;
-    if (renderTarget) {
-        // unbind the texture from the texture unit before binding it to the frame buffer
-        GL_CALL(BindTexture(idDesc.fInfo.fTarget, 0));
-        GrGLRenderTarget::IDDesc rtIDDesc;
-
-        if (!this->createRenderTargetObjects(desc, lifeCycle, idDesc.fInfo, &rtIDDesc)) {
-            GL_CALL(DeleteTextures(1, &idDesc.fInfo.fID));
-            return return_null_texture();
-        }
-        tex = new GrGLTextureRenderTarget(this, desc, idDesc, rtIDDesc);
-    } else {
-        tex = new GrGLTexture(this, desc, idDesc);
-    }
-    tex->setCachedTexParams(initialTexParams, this->getResetTimestamp());
-#ifdef TRACE_TEXTURE_CREATION
-    SkDebugf("--- new texture [%d] size=(%d %d) config=%d\n",
-             glTexDesc.fTextureID, desc.fWidth, desc.fHeight, desc.fConfig);
-#endif
-    return tex;
-}
-
-GrTexture* GrGLGpu::onCreateCompressedTexture(const GrSurfaceDesc& desc,
-                                              GrGpuResource::LifeCycle lifeCycle,
-                                              const void* srcData) {
-    // Make sure that we're not flipping Y.
-    if (kBottomLeft_GrSurfaceOrigin == desc.fOrigin) {
-        return return_null_texture();
-    }
-
-    GrGLTexture::IDDesc idDesc;
-    idDesc.fInfo.fID = 0;
-    GL_CALL(GenTextures(1, &idDesc.fInfo.fID));
-    idDesc.fLifeCycle = lifeCycle;
-    // We only support GL_TEXTURE_2D at the moment.
-    idDesc.fInfo.fTarget = GR_GL_TEXTURE_2D;
-
-    if (!idDesc.fInfo.fID) {
-        return return_null_texture();
-    }
-
-    this->setScratchTextureUnit();
-    GL_CALL(BindTexture(idDesc.fInfo.fTarget, idDesc.fInfo.fID));
-
-    // Some drivers like to know filter/wrap before seeing glTexImage2D. Some
-    // drivers have a bug where an FBO won't be complete if it includes a
-    // texture that is not mipmap complete (considering the filter in use).
-    GrGLTexture::TexParams initialTexParams;
-    // we only set a subset here so invalidate first
-    initialTexParams.invalidate();
-    initialTexParams.fMinFilter = GR_GL_NEAREST;
-    initialTexParams.fMagFilter = GR_GL_NEAREST;
-    initialTexParams.fWrapS = GR_GL_CLAMP_TO_EDGE;
-    initialTexParams.fWrapT = GR_GL_CLAMP_TO_EDGE;
-    GL_CALL(TexParameteri(idDesc.fInfo.fTarget,
-                          GR_GL_TEXTURE_MAG_FILTER,
-                          initialTexParams.fMagFilter));
-    GL_CALL(TexParameteri(idDesc.fInfo.fTarget,
-                          GR_GL_TEXTURE_MIN_FILTER,
-                          initialTexParams.fMinFilter));
-    GL_CALL(TexParameteri(idDesc.fInfo.fTarget,
-                          GR_GL_TEXTURE_WRAP_S,
-                          initialTexParams.fWrapS));
-    GL_CALL(TexParameteri(idDesc.fInfo.fTarget,
-                          GR_GL_TEXTURE_WRAP_T,
-                          initialTexParams.fWrapT));
-
-    if (!this->uploadCompressedTexData(desc, idDesc.fInfo.fTarget, srcData)) {
-        GL_CALL(DeleteTextures(1, &idDesc.fInfo.fID));
-        return return_null_texture();
-    }
-
-    GrGLTexture* tex;
-    tex = new GrGLTexture(this, desc, idDesc);
-    tex->setCachedTexParams(initialTexParams, this->getResetTimestamp());
-#ifdef TRACE_TEXTURE_CREATION
-    SkDebugf("--- new compressed texture [%d] size=(%d %d) config=%d\n",
-             glTexDesc.fTextureID, desc.fWidth, desc.fHeight, desc.fConfig);
-#endif
-    return tex;
-}
-
-namespace {
-
-const GrGLuint kUnknownBitCount = GrGLStencilAttachment::kUnknownBitCount;
-
-void inline get_stencil_rb_sizes(const GrGLInterface* gl,
-                                 GrGLStencilAttachment::Format* format) {
-
-    // we shouldn't ever know one size and not the other
-    SkASSERT((kUnknownBitCount == format->fStencilBits) ==
-             (kUnknownBitCount == format->fTotalBits));
-    if (kUnknownBitCount == format->fStencilBits) {
-        GR_GL_GetRenderbufferParameteriv(gl, GR_GL_RENDERBUFFER,
-                                         GR_GL_RENDERBUFFER_STENCIL_SIZE,
-                                         (GrGLint*)&format->fStencilBits);
-        if (format->fPacked) {
-            GR_GL_GetRenderbufferParameteriv(gl, GR_GL_RENDERBUFFER,
-                                             GR_GL_RENDERBUFFER_DEPTH_SIZE,
-                                             (GrGLint*)&format->fTotalBits);
-            format->fTotalBits += format->fStencilBits;
-        } else {
-            format->fTotalBits = format->fStencilBits;
-        }
-    }
-}
-}
-
-int GrGLGpu::getCompatibleStencilIndex(GrPixelConfig config) {
-    static const int kSize = 16;
-    SkASSERT(this->caps()->isConfigRenderable(config, false));
-    if (!this->glCaps().hasStencilFormatBeenDeterminedForConfig(config)) {
-        // Default to unsupported, set this if we find a stencil format that works.
-        int firstWorkingStencilFormatIndex = -1;
-        // Create color texture
-        GrGLuint colorID = 0;
-        GL_CALL(GenTextures(1, &colorID));
-        this->setScratchTextureUnit();
-        GL_CALL(BindTexture(GR_GL_TEXTURE_2D, colorID));
-        GL_CALL(TexParameteri(GR_GL_TEXTURE_2D,
-                              GR_GL_TEXTURE_MAG_FILTER,
-                              GR_GL_NEAREST));
-        GL_CALL(TexParameteri(GR_GL_TEXTURE_2D,
-                              GR_GL_TEXTURE_MIN_FILTER,
-                              GR_GL_NEAREST));
-        GL_CALL(TexParameteri(GR_GL_TEXTURE_2D,
-                              GR_GL_TEXTURE_WRAP_S,
-                              GR_GL_CLAMP_TO_EDGE));
-        GL_CALL(TexParameteri(GR_GL_TEXTURE_2D,
-                              GR_GL_TEXTURE_WRAP_T,
-                              GR_GL_CLAMP_TO_EDGE));
-
-        const GrGLCaps::ConfigFormats colorFormats = this->glCaps().configGLFormats(config);
-
-        CLEAR_ERROR_BEFORE_ALLOC(this->glInterface());
-        GL_ALLOC_CALL(this->glInterface(), TexImage2D(GR_GL_TEXTURE_2D,
-                                                      0,
-                                                      colorFormats.fInternalFormatTexImage,
-                                                      kSize,
-                                                      kSize,
-                                                      0,
-                                                      colorFormats.fExternalFormatForTexImage,
-                                                      colorFormats.fExternalType,
-                                                      NULL));
-        if (GR_GL_NO_ERROR != CHECK_ALLOC_ERROR(this->glInterface())) {
-            GL_CALL(DeleteTextures(1, &colorID));
-            return -1;
-        }
-
-        // unbind the texture from the texture unit before binding it to the frame buffer
-        GL_CALL(BindTexture(GR_GL_TEXTURE_2D, 0));
-
-        // Create Framebuffer
-        GrGLuint fb = 0;
-        GL_CALL(GenFramebuffers(1, &fb));
-        GL_CALL(BindFramebuffer(GR_GL_FRAMEBUFFER, fb));
-        fHWBoundRenderTargetUniqueID = SK_InvalidUniqueID;
-        GL_CALL(FramebufferTexture2D(GR_GL_FRAMEBUFFER,
-                                     GR_GL_COLOR_ATTACHMENT0,
-                                     GR_GL_TEXTURE_2D,
-                                     colorID,
-                                     0));
-        GrGLuint sbRBID = 0;
-        GL_CALL(GenRenderbuffers(1, &sbRBID));
-
-        // look over formats till I find a compatible one
-        int stencilFmtCnt = this->glCaps().stencilFormats().count();
-        if (sbRBID) {
-            GL_CALL(BindRenderbuffer(GR_GL_RENDERBUFFER, sbRBID));
-            for (int i = 0; i < stencilFmtCnt && sbRBID; ++i) {
-                const GrGLCaps::StencilFormat& sFmt = this->glCaps().stencilFormats()[i];
-                CLEAR_ERROR_BEFORE_ALLOC(this->glInterface());
-                GL_ALLOC_CALL(this->glInterface(), RenderbufferStorage(GR_GL_RENDERBUFFER,
-                                                                       sFmt.fInternalFormat,
-                                                                       kSize, kSize));
-                if (GR_GL_NO_ERROR == CHECK_ALLOC_ERROR(this->glInterface())) {
-                    GL_CALL(FramebufferRenderbuffer(GR_GL_FRAMEBUFFER,
-                                                    GR_GL_STENCIL_ATTACHMENT,
-                                                    GR_GL_RENDERBUFFER, sbRBID));
-                    if (sFmt.fPacked) {
-                        GL_CALL(FramebufferRenderbuffer(GR_GL_FRAMEBUFFER,
-                                                        GR_GL_DEPTH_ATTACHMENT,
-                                                        GR_GL_RENDERBUFFER, sbRBID));
-                    } else {
-                        GL_CALL(FramebufferRenderbuffer(GR_GL_FRAMEBUFFER,
-                                                        GR_GL_DEPTH_ATTACHMENT,
-                                                        GR_GL_RENDERBUFFER, 0));
-                    }
-                    GrGLenum status;
-                    GL_CALL_RET(status, CheckFramebufferStatus(GR_GL_FRAMEBUFFER));
-                    if (status == GR_GL_FRAMEBUFFER_COMPLETE) {
-                        firstWorkingStencilFormatIndex = i;
-                        break;
-                    }
-                    GL_CALL(FramebufferRenderbuffer(GR_GL_FRAMEBUFFER,
-                                                    GR_GL_STENCIL_ATTACHMENT,
-                                                    GR_GL_RENDERBUFFER, 0));
-                    if (sFmt.fPacked) {
-                        GL_CALL(FramebufferRenderbuffer(GR_GL_FRAMEBUFFER,
-                                                        GR_GL_DEPTH_ATTACHMENT,
-                                                        GR_GL_RENDERBUFFER, 0));
-                    }
-                }
-            }
-            GL_CALL(DeleteRenderbuffers(1, &sbRBID));
-        }
-        GL_CALL(DeleteTextures(1, &colorID));
-        GL_CALL(BindFramebuffer(GR_GL_FRAMEBUFFER, 0));
-        GL_CALL(DeleteFramebuffers(1, &fb));
-        fGLContext->caps()->setStencilFormatIndexForConfig(config, firstWorkingStencilFormatIndex);
-    }
-    return this->glCaps().getStencilFormatIndexForConfig(config);
-}
-
-GrStencilAttachment* GrGLGpu::createStencilAttachmentForRenderTarget(const GrRenderTarget* rt,
-                                                                     int width,
-                                                                     int height) {
-    // All internally created RTs are also textures. We don't create
-    // SBs for a client's standalone RT (that is a RT that isn't also a texture).
-    SkASSERT(rt->asTexture());
-    SkASSERT(width >= rt->width());
-    SkASSERT(height >= rt->height());
-
-    int samples = rt->numStencilSamples();
-    GrGLStencilAttachment::IDDesc sbDesc;
-
-    int sIdx = this->getCompatibleStencilIndex(rt->config());
-    if (sIdx < 0) {
-        return nullptr;
-    }
-
-    if (!sbDesc.fRenderbufferID) {
-        GL_CALL(GenRenderbuffers(1, &sbDesc.fRenderbufferID));
-    }
-    if (!sbDesc.fRenderbufferID) {
-        return nullptr;
-    }
-    GL_CALL(BindRenderbuffer(GR_GL_RENDERBUFFER, sbDesc.fRenderbufferID));
-    const GrGLCaps::StencilFormat& sFmt = this->glCaps().stencilFormats()[sIdx];
-    CLEAR_ERROR_BEFORE_ALLOC(this->glInterface());
-    // we do this "if" so that we don't call the multisample
-    // version on a GL that doesn't have an MSAA extension.
-    if (samples > 0) {
-        SkAssertResult(renderbuffer_storage_msaa(*fGLContext,
-                                                 samples,
-                                                 sFmt.fInternalFormat,
-                                                 width, height));
-    } else {
-        GL_ALLOC_CALL(this->glInterface(), RenderbufferStorage(GR_GL_RENDERBUFFER,
-                                                               sFmt.fInternalFormat,
-                                                               width, height));
-        SkASSERT(GR_GL_NO_ERROR == check_alloc_error(rt->desc(), this->glInterface()));
-    }
-    fStats.incStencilAttachmentCreates();
-    // After sized formats we attempt an unsized format and take
-    // whatever sizes GL gives us. In that case we query for the size.
-    GrGLStencilAttachment::Format format = sFmt;
-    get_stencil_rb_sizes(this->glInterface(), &format);
-    GrGLStencilAttachment* stencil = new GrGLStencilAttachment(this,
-                                                               sbDesc,
-                                                               width,
-                                                               height,
-                                                               samples,
-                                                               format);
-    return stencil;
-}
-
-////////////////////////////////////////////////////////////////////////////////
-
-// GL_STREAM_DRAW triggers an optimization in Chromium's GPU process where a client's vertex buffer
-// objects are implemented as client-side-arrays on tile-deferred architectures.
-#define DYNAMIC_USAGE_PARAM GR_GL_STREAM_DRAW
-
-GrVertexBuffer* GrGLGpu::onCreateVertexBuffer(size_t size, bool dynamic) {
-    GrGLVertexBuffer::Desc desc;
-    desc.fUsage = dynamic ? GrGLBufferImpl::kDynamicDraw_Usage : GrGLBufferImpl::kStaticDraw_Usage;
-    desc.fSizeInBytes = size;
-
-    if (this->glCaps().useNonVBOVertexAndIndexDynamicData() && dynamic) {
-        desc.fID = 0;
-        GrGLVertexBuffer* vertexBuffer = new GrGLVertexBuffer(this, desc);
-        return vertexBuffer;
-    } else {
-        desc.fID = 0;
-        GL_CALL(GenBuffers(1, &desc.fID));
-        if (desc.fID) {
-            fHWGeometryState.setVertexBufferID(this, desc.fID);
-            CLEAR_ERROR_BEFORE_ALLOC(this->glInterface());
-            // make sure driver can allocate memory for this buffer
-            GL_ALLOC_CALL(this->glInterface(),
-                          BufferData(GR_GL_ARRAY_BUFFER,
-                                     (GrGLsizeiptr) desc.fSizeInBytes,
-                                     nullptr,   // data ptr
-                                     dynamic ? DYNAMIC_USAGE_PARAM : GR_GL_STATIC_DRAW));
-            if (CHECK_ALLOC_ERROR(this->glInterface()) != GR_GL_NO_ERROR) {
-                GL_CALL(DeleteBuffers(1, &desc.fID));
-                this->notifyVertexBufferDelete(desc.fID);
-                return nullptr;
-            }
-            GrGLVertexBuffer* vertexBuffer = new GrGLVertexBuffer(this, desc);
-            return vertexBuffer;
-        }
-        return nullptr;
-    }
-}
-
-GrIndexBuffer* GrGLGpu::onCreateIndexBuffer(size_t size, bool dynamic) {
-    GrGLIndexBuffer::Desc desc;
-    desc.fUsage = dynamic ? GrGLBufferImpl::kDynamicDraw_Usage : GrGLBufferImpl::kStaticDraw_Usage;
-    desc.fSizeInBytes = size;
-
-    if (this->glCaps().useNonVBOVertexAndIndexDynamicData() && dynamic) {
-        desc.fID = 0;
-        GrIndexBuffer* indexBuffer = new GrGLIndexBuffer(this, desc);
-        return indexBuffer;
-    } else {
-        desc.fID = 0;
-        GL_CALL(GenBuffers(1, &desc.fID));
-        if (desc.fID) {
-            fHWGeometryState.setIndexBufferIDOnDefaultVertexArray(this, desc.fID);
-            CLEAR_ERROR_BEFORE_ALLOC(this->glInterface());
-            // make sure driver can allocate memory for this buffer
-            GL_ALLOC_CALL(this->glInterface(),
-                          BufferData(GR_GL_ELEMENT_ARRAY_BUFFER,
-                                     (GrGLsizeiptr) desc.fSizeInBytes,
-                                     nullptr,  // data ptr
-                                     dynamic ? DYNAMIC_USAGE_PARAM : GR_GL_STATIC_DRAW));
-            if (CHECK_ALLOC_ERROR(this->glInterface()) != GR_GL_NO_ERROR) {
-                GL_CALL(DeleteBuffers(1, &desc.fID));
-                this->notifyIndexBufferDelete(desc.fID);
-                return nullptr;
-            }
-            GrIndexBuffer* indexBuffer = new GrGLIndexBuffer(this, desc);
-            return indexBuffer;
-        }
-        return nullptr;
-    }
-}
-
-GrTransferBuffer* GrGLGpu::onCreateTransferBuffer(size_t size, TransferType xferType) {
-    GrGLCaps::TransferBufferType xferBufferType = this->ctxInfo().caps()->transferBufferType();
-    if (GrGLCaps::kNone_TransferBufferType == xferBufferType) {
-        return nullptr;
-    }
-
-    GrGLTransferBuffer::Desc desc;
-    bool toGpu = (kCpuToGpu_TransferType == xferType);
-    desc.fUsage = toGpu ? GrGLBufferImpl::kStreamDraw_Usage : GrGLBufferImpl::kStreamRead_Usage;
-
-    desc.fSizeInBytes = size;
-    desc.fID = 0;
-    GL_CALL(GenBuffers(1, &desc.fID));
-    if (desc.fID) {
-        CLEAR_ERROR_BEFORE_ALLOC(this->glInterface());
-        // make sure driver can allocate memory for this bmapuffer
-        GrGLenum type;
-        if (GrGLCaps::kChromium_TransferBufferType == xferBufferType) {
-            type = toGpu ? GR_GL_PIXEL_UNPACK_TRANSFER_BUFFER_CHROMIUM
-                         : GR_GL_PIXEL_PACK_TRANSFER_BUFFER_CHROMIUM;
-        } else {
-            SkASSERT(GrGLCaps::kPBO_TransferBufferType == xferBufferType);
-            type = toGpu ? GR_GL_PIXEL_UNPACK_BUFFER : GR_GL_PIXEL_PACK_BUFFER;
-        }
-        GL_ALLOC_CALL(this->glInterface(),
-                      BufferData(type,
-                                 (GrGLsizeiptr) desc.fSizeInBytes,
-                                 nullptr,  // data ptr
-                                 (toGpu ? GR_GL_STREAM_DRAW : GR_GL_STREAM_READ)));
-        if (CHECK_ALLOC_ERROR(this->glInterface()) != GR_GL_NO_ERROR) {
-            GL_CALL(DeleteBuffers(1, &desc.fID));
-            return nullptr;
-        }
-        GrTransferBuffer* transferBuffer = new GrGLTransferBuffer(this, desc, type);
-        return transferBuffer;
-    }
-
-    return nullptr;
-}
-
-void GrGLGpu::flushScissor(const GrScissorState& scissorState,
-                           const GrGLIRect& rtViewport,
-                           GrSurfaceOrigin rtOrigin) {
-    if (scissorState.enabled()) {
-        GrGLIRect scissor;
-        scissor.setRelativeTo(rtViewport,
-                              scissorState.rect().fLeft,
-                              scissorState.rect().fTop,
-                              scissorState.rect().width(),
-                              scissorState.rect().height(),
-                              rtOrigin);
-        // if the scissor fully contains the viewport then we fall through and
-        // disable the scissor test.
-        if (!scissor.contains(rtViewport)) {
-            if (fHWScissorSettings.fRect != scissor) {
-                scissor.pushToGLScissor(this->glInterface());
-                fHWScissorSettings.fRect = scissor;
-            }
-            if (kYes_TriState != fHWScissorSettings.fEnabled) {
-                GL_CALL(Enable(GR_GL_SCISSOR_TEST));
-                fHWScissorSettings.fEnabled = kYes_TriState;
-            }
-            return;
-        }
-    }
-
-    // See fall through note above
-    this->disableScissor();
-}
-
-bool GrGLGpu::flushGLState(const DrawArgs& args) {
-    GrXferProcessor::BlendInfo blendInfo;
-    const GrPipeline& pipeline = *args.fPipeline;
-    args.fPipeline->getXferProcessor().getBlendInfo(&blendInfo);
-
-    this->flushColorWrite(blendInfo.fWriteColor);
-    this->flushDrawFace(pipeline.getDrawFace());
-
-    SkAutoTUnref<GrGLProgram> program(fProgramCache->refProgram(args));
-    if (!program) {
-        GrCapsDebugf(this->caps(), "Failed to create program!\n");
-        return false;
-    }
-
-    GrGLuint programID = program->programID();
-    if (fHWProgramID != programID) {
-        GL_CALL(UseProgram(programID));
-        fHWProgramID = programID;
-    }
-
-    if (blendInfo.fWriteColor) {
-        this->flushBlend(blendInfo);
-    }
-
-    SkSTArray<8, const GrTextureAccess*> textureAccesses;
-    program->setData(*args.fPrimitiveProcessor, pipeline, &textureAccesses);
-
-    int numTextureAccesses = textureAccesses.count();
-    for (int i = 0; i < numTextureAccesses; i++) {
-        this->bindTexture(i, textureAccesses[i]->getParams(),
-                          static_cast<GrGLTexture*>(textureAccesses[i]->getTexture()));
-    }
-
-    GrGLRenderTarget* glRT = static_cast<GrGLRenderTarget*>(pipeline.getRenderTarget());
-    this->flushStencil(pipeline.getStencil());
-    this->flushScissor(pipeline.getScissorState(), glRT->getViewport(), glRT->origin());
-    this->flushHWAAState(glRT, pipeline.isHWAntialiasState());
-
-    // This must come after textures are flushed because a texture may need
-    // to be msaa-resolved (which will modify bound FBO state).
-    this->flushRenderTarget(glRT, nullptr);
-
-    return true;
-}
-
-void GrGLGpu::setupGeometry(const GrPrimitiveProcessor& primProc,
-                            const GrNonInstancedVertices& vertices,
-                            size_t* indexOffsetInBytes) {
-    GrGLVertexBuffer* vbuf;
-    vbuf = (GrGLVertexBuffer*) vertices.vertexBuffer();
-
-    SkASSERT(vbuf);
-    SkASSERT(!vbuf->isMapped());
-
-    GrGLIndexBuffer* ibuf = nullptr;
-    if (vertices.isIndexed()) {
-        SkASSERT(indexOffsetInBytes);
-
-        *indexOffsetInBytes = 0;
-        ibuf = (GrGLIndexBuffer*)vertices.indexBuffer();
-
-        SkASSERT(ibuf);
-        SkASSERT(!ibuf->isMapped());
-        *indexOffsetInBytes += ibuf->baseOffset();
-    }
-    GrGLAttribArrayState* attribState =
-        fHWGeometryState.bindArrayAndBuffersToDraw(this, vbuf, ibuf);
-
-    int vaCount = primProc.numAttribs();
-    if (vaCount > 0) {
-
-        GrGLsizei stride = static_cast<GrGLsizei>(primProc.getVertexStride());
-
-        size_t vertexOffsetInBytes = stride * vertices.startVertex();
-
-        vertexOffsetInBytes += vbuf->baseOffset();
-
-        uint32_t usedAttribArraysMask = 0;
-        size_t offset = 0;
-
-        for (int attribIndex = 0; attribIndex < vaCount; attribIndex++) {
-            const GrGeometryProcessor::Attribute& attrib = primProc.getAttrib(attribIndex);
-            usedAttribArraysMask |= (1 << attribIndex);
-            GrVertexAttribType attribType = attrib.fType;
-            attribState->set(this,
-                             attribIndex,
-                             vbuf->bufferID(),
-                             GrGLAttribTypeToLayout(attribType).fCount,
-                             GrGLAttribTypeToLayout(attribType).fType,
-                             GrGLAttribTypeToLayout(attribType).fNormalized,
-                             stride,
-                             reinterpret_cast<GrGLvoid*>(vertexOffsetInBytes + offset));
-            offset += attrib.fOffset;
-        }
-        attribState->disableUnusedArrays(this, usedAttribArraysMask);
-    }
-}
-
-void GrGLGpu::buildProgramDesc(GrProgramDesc* desc,
-                               const GrPrimitiveProcessor& primProc,
-                               const GrPipeline& pipeline) const {
-    if (!GrGLProgramDescBuilder::Build(desc, primProc, pipeline, this)) {
-        SkDEBUGFAIL("Failed to generate GL program descriptor");
-    }
-}
-
-void GrGLGpu::bindBuffer(GrGLuint id, GrGLenum type) {
-    this->handleDirtyContext();
-    if (GR_GL_ARRAY_BUFFER == type) {
-        this->bindVertexBuffer(id);
-    } else if (GR_GL_ELEMENT_ARRAY_BUFFER == type) {
-        this->bindIndexBufferAndDefaultVertexArray(id);
-    } else {
-        GR_GL_CALL(this->glInterface(), BindBuffer(type, id));
-    }
-}
-
-void GrGLGpu::releaseBuffer(GrGLuint id, GrGLenum type) {
-    this->handleDirtyContext();
-    GL_CALL(DeleteBuffers(1, &id));
-    if (GR_GL_ARRAY_BUFFER == type) {
-        this->notifyVertexBufferDelete(id);
-    } else if (GR_GL_ELEMENT_ARRAY_BUFFER == type) {
-        this->notifyIndexBufferDelete(id);
-    }
-}
-
-static GrGLenum get_gl_usage(GrGLBufferImpl::Usage usage) {
-    static const GrGLenum grToGL[] = {
-        GR_GL_STATIC_DRAW,   // GrGLBufferImpl::kStaticDraw_Usage
-        DYNAMIC_USAGE_PARAM, // GrGLBufferImpl::kDynamicDraw_Usage
-        GR_GL_STREAM_DRAW,   // GrGLBufferImpl::kStreamDraw_Usage
-        GR_GL_STREAM_READ,   // GrGLBufferImpl::kStreamRead_Usage
-    };
-    static_assert(SK_ARRAY_COUNT(grToGL) == GrGLBufferImpl::kUsageCount, "array_size_mismatch");
-
-    return grToGL[usage];
-}
-
-void* GrGLGpu::mapBuffer(GrGLuint id, GrGLenum type, GrGLBufferImpl::Usage usage, 
-                         size_t currentSize, size_t requestedSize) {
-    void* mapPtr = nullptr;
-    GrGLenum glUsage = get_gl_usage(usage);
-    bool readOnly = (GrGLBufferImpl::kStreamRead_Usage == usage);
-
-    // Handling dirty context is done in the bindBuffer call
-    switch (this->glCaps().mapBufferType()) {
-        case GrGLCaps::kNone_MapBufferType:
-            break;
-        case GrGLCaps::kMapBuffer_MapBufferType:
-            this->bindBuffer(id, type);
-            // Let driver know it can discard the old data
-            if (GR_GL_USE_BUFFER_DATA_NULL_HINT || currentSize != requestedSize) {
-                GL_CALL(BufferData(type, requestedSize, nullptr, glUsage));
-            }
-            GL_CALL_RET(mapPtr, MapBuffer(type, readOnly ? GR_GL_READ_ONLY : GR_GL_WRITE_ONLY));
-            break;
-        case GrGLCaps::kMapBufferRange_MapBufferType: {
-            this->bindBuffer(id, type);
-            // Make sure the GL buffer size agrees with fDesc before mapping.
-            if (currentSize != requestedSize) {
-                GL_CALL(BufferData(type, requestedSize, nullptr, glUsage));
-            }
-            static const GrGLbitfield kWriteAccess = GR_GL_MAP_INVALIDATE_BUFFER_BIT |
-                                                     GR_GL_MAP_WRITE_BIT;
-            GL_CALL_RET(mapPtr, MapBufferRange(type, 0, requestedSize, readOnly ? 
-                                                                       GR_GL_MAP_READ_BIT :                                                       
-                                                                       kWriteAccess));
-            break;
-        }
-        case GrGLCaps::kChromium_MapBufferType:
-            this->bindBuffer(id, type);
-            // Make sure the GL buffer size agrees with fDesc before mapping.
-            if (currentSize != requestedSize) {
-                GL_CALL(BufferData(type, requestedSize, nullptr, glUsage));
-            }
-            GL_CALL_RET(mapPtr, MapBufferSubData(type, 0, requestedSize, readOnly ? 
-                                                                         GR_GL_READ_ONLY : 
-                                                                         GR_GL_WRITE_ONLY));
-            break;
-    }
-    return mapPtr;
-}
-
-void GrGLGpu::bufferData(GrGLuint id, GrGLenum type, GrGLBufferImpl::Usage usage, 
-                         size_t currentSize, const void* src, size_t srcSizeInBytes) {
-    SkASSERT(srcSizeInBytes <= currentSize);
-    // bindbuffer handles dirty context
-    this->bindBuffer(id, type);
-    GrGLenum glUsage = get_gl_usage(usage);
-
-#if GR_GL_USE_BUFFER_DATA_NULL_HINT
-    if (currentSize == srcSizeInBytes) {
-        GL_CALL(BufferData(type, (GrGLsizeiptr) srcSizeInBytes, src, glUsage));
-    } else {
-        // Before we call glBufferSubData we give the driver a hint using
-        // glBufferData with nullptr. This makes the old buffer contents
-        // inaccessible to future draws. The GPU may still be processing
-        // draws that reference the old contents. With this hint it can
-        // assign a different allocation for the new contents to avoid
-        // flushing the gpu past draws consuming the old contents.
-        // TODO I think we actually want to try calling bufferData here
-        GL_CALL(BufferData(type, currentSize, nullptr, glUsage));
-        GL_CALL(BufferSubData(type, 0, (GrGLsizeiptr) srcSizeInBytes, src));
-    }
-#else
-    // Note that we're cheating on the size here. Currently no methods
-    // allow a partial update that preserves contents of non-updated
-    // portions of the buffer (map() does a glBufferData(..size, nullptr..))
-    GL_CALL(BufferData(type, srcSizeInBytes, src, glUsage));
-#endif
-}
-
-void GrGLGpu::unmapBuffer(GrGLuint id, GrGLenum type, void* mapPtr) {
-    // bind buffer handles the dirty context
-    switch (this->glCaps().mapBufferType()) {
-        case GrGLCaps::kNone_MapBufferType:
-            SkDEBUGFAIL("Shouldn't get here.");
-            return;
-        case GrGLCaps::kMapBuffer_MapBufferType: // fall through
-        case GrGLCaps::kMapBufferRange_MapBufferType:
-            this->bindBuffer(id, type);
-            GL_CALL(UnmapBuffer(type));
-            break;
-        case GrGLCaps::kChromium_MapBufferType:
-            this->bindBuffer(id, type);
-            GL_CALL(UnmapBufferSubData(mapPtr));
-            break;
-    }
-}
-
-void GrGLGpu::disableScissor() {
-    if (kNo_TriState != fHWScissorSettings.fEnabled) {
-        GL_CALL(Disable(GR_GL_SCISSOR_TEST));
-        fHWScissorSettings.fEnabled = kNo_TriState;
-        return;
-    }
-}
-
-void GrGLGpu::onClear(GrRenderTarget* target, const SkIRect& rect, GrColor color) {
-    // parent class should never let us get here with no RT
-    SkASSERT(target);
-    GrGLRenderTarget* glRT = static_cast<GrGLRenderTarget*>(target);
-
-    this->flushRenderTarget(glRT, &rect);
-    GrScissorState scissorState;
-    scissorState.set(rect);
-    this->flushScissor(scissorState, glRT->getViewport(), glRT->origin());
-
-    GrGLfloat r, g, b, a;
-    static const GrGLfloat scale255 = 1.f / 255.f;
-    a = GrColorUnpackA(color) * scale255;
-    GrGLfloat scaleRGB = scale255;
-    r = GrColorUnpackR(color) * scaleRGB;
-    g = GrColorUnpackG(color) * scaleRGB;
-    b = GrColorUnpackB(color) * scaleRGB;
-
-    GL_CALL(ColorMask(GR_GL_TRUE, GR_GL_TRUE, GR_GL_TRUE, GR_GL_TRUE));
-    fHWWriteToColor = kYes_TriState;
-    GL_CALL(ClearColor(r, g, b, a));
-    GL_CALL(Clear(GR_GL_COLOR_BUFFER_BIT));
-}
-
-void GrGLGpu::discard(GrRenderTarget* renderTarget) {
-    SkASSERT(renderTarget);
-    if (!this->caps()->discardRenderTargetSupport()) {
-        return;
-    }
-
-    GrGLRenderTarget* glRT = static_cast<GrGLRenderTarget*>(renderTarget);
-    if (renderTarget->getUniqueID() != fHWBoundRenderTargetUniqueID) {
-        fHWBoundRenderTargetUniqueID = SK_InvalidUniqueID;
-        fStats.incRenderTargetBinds();
-        GL_CALL(BindFramebuffer(GR_GL_FRAMEBUFFER, glRT->renderFBOID()));
-    }
-    switch (this->glCaps().invalidateFBType()) {
-        case GrGLCaps::kNone_InvalidateFBType:
-            SkFAIL("Should never get here.");
-            break;
-        case GrGLCaps::kInvalidate_InvalidateFBType:
-            if (0 == glRT->renderFBOID()) {
-                //  When rendering to the default framebuffer the legal values for attachments
-                //  are GL_COLOR, GL_DEPTH, GL_STENCIL, ... rather than the various FBO attachment
-                //  types.
-                static const GrGLenum attachments[] = { GR_GL_COLOR };
-                GL_CALL(InvalidateFramebuffer(GR_GL_FRAMEBUFFER, SK_ARRAY_COUNT(attachments),
-                        attachments));
-            } else {
-                static const GrGLenum attachments[] = { GR_GL_COLOR_ATTACHMENT0 };
-                GL_CALL(InvalidateFramebuffer(GR_GL_FRAMEBUFFER, SK_ARRAY_COUNT(attachments),
-                        attachments));
-            }
-            break;
-        case GrGLCaps::kDiscard_InvalidateFBType: {
-            if (0 == glRT->renderFBOID()) {
-                //  When rendering to the default framebuffer the legal values for attachments
-                //  are GL_COLOR, GL_DEPTH, GL_STENCIL, ... rather than the various FBO attachment
-                //  types. See glDiscardFramebuffer() spec.
-                static const GrGLenum attachments[] = { GR_GL_COLOR };
-                GL_CALL(DiscardFramebuffer(GR_GL_FRAMEBUFFER, SK_ARRAY_COUNT(attachments),
-                        attachments));
-            } else {
-                static const GrGLenum attachments[] = { GR_GL_COLOR_ATTACHMENT0 };
-                GL_CALL(DiscardFramebuffer(GR_GL_FRAMEBUFFER, SK_ARRAY_COUNT(attachments),
-                        attachments));
-            }
-            break;
-        }
-    }
-    renderTarget->flagAsResolved();
-}
-
-void GrGLGpu::clearStencil(GrRenderTarget* target) {
-    if (nullptr == target) {
-        return;
-    }
-    GrGLRenderTarget* glRT = static_cast<GrGLRenderTarget*>(target);
-    this->flushRenderTarget(glRT, &SkIRect::EmptyIRect());
-
-    this->disableScissor();
-
-    GL_CALL(StencilMask(0xffffffff));
-    GL_CALL(ClearStencil(0));
-    GL_CALL(Clear(GR_GL_STENCIL_BUFFER_BIT));
-    fHWStencilSettings.invalidate();
-}
-
-void GrGLGpu::onClearStencilClip(GrRenderTarget* target, const SkIRect& rect, bool insideClip) {
-    SkASSERT(target);
-
-    GrStencilAttachment* sb = target->renderTargetPriv().getStencilAttachment();
-    // this should only be called internally when we know we have a
-    // stencil buffer.
-    SkASSERT(sb);
-    GrGLint stencilBitCount =  sb->bits();
-#if 0
-    SkASSERT(stencilBitCount > 0);
-    GrGLint clipStencilMask  = (1 << (stencilBitCount - 1));
-#else
-    // we could just clear the clip bit but when we go through
-    // ANGLE a partial stencil mask will cause clears to be
-    // turned into draws. Our contract on GrDrawTarget says that
-    // changing the clip between stencil passes may or may not
-    // zero the client's clip bits. So we just clear the whole thing.
-    static const GrGLint clipStencilMask  = ~0;
-#endif
-    GrGLint value;
-    if (insideClip) {
-        value = (1 << (stencilBitCount - 1));
-    } else {
-        value = 0;
-    }
-    GrGLRenderTarget* glRT = static_cast<GrGLRenderTarget*>(target);
-    this->flushRenderTarget(glRT, &SkIRect::EmptyIRect());
-
-    GrScissorState scissorState;
-    scissorState.set(rect);
-    this->flushScissor(scissorState, glRT->getViewport(), glRT->origin());
-
-    GL_CALL(StencilMask((uint32_t) clipStencilMask));
-    GL_CALL(ClearStencil(value));
-    GL_CALL(Clear(GR_GL_STENCIL_BUFFER_BIT));
-    fHWStencilSettings.invalidate();
-}
-
-static bool read_pixels_pays_for_y_flip(GrRenderTarget* renderTarget, const GrGLCaps& caps,
-                                        int width, int height,  GrPixelConfig config,
-                                        size_t rowBytes) {
-    // If this render target is already TopLeft, we don't need to flip.
-    if (kTopLeft_GrSurfaceOrigin == renderTarget->origin()) {
-        return false;
-    }
-
-    // If the read is really small or smaller than the min texture size, don't force a draw.
-    static const int kMinSize = 32;
-    if (width < kMinSize || height < kMinSize) {
-        return false;
-    }
-
-    // if GL can do the flip then we'll never pay for it.
-    if (caps.packFlipYSupport()) {
-        return false;
-    }
-
-    // If we have to do memcpy to handle non-trim rowBytes then we
-    // get the flip for free. Otherwise it costs.
-    // Note that we're assuming that 0 rowBytes has already been handled and that the width has been
-    // clipped.
-    return caps.packRowLengthSupport() || GrBytesPerPixel(config) * width == rowBytes;
-}
-
-bool GrGLGpu::onGetReadPixelsInfo(GrSurface* srcSurface, int width, int height, size_t rowBytes,
-                                  GrPixelConfig readConfig, DrawPreference* drawPreference,
-                                  ReadPixelTempDrawInfo* tempDrawInfo) {
-    // This subclass can only read pixels from a render target. We could use glTexSubImage2D on
-    // GL versions that support it but we don't today.
-    if (!srcSurface->asRenderTarget()) {
-        ElevateDrawPreference(drawPreference, kRequireDraw_DrawPreference);
-    }
-
-    if (GrPixelConfigIsSRGB(srcSurface->config()) != GrPixelConfigIsSRGB(readConfig)) {
-        ElevateDrawPreference(drawPreference, kRequireDraw_DrawPreference);
-    }
-
-    tempDrawInfo->fSwapRAndB = false;
-
-    // These settings we will always want if a temp draw is performed. The config is set below
-    // depending on whether we want to do a R/B swap or not.
-    tempDrawInfo->fTempSurfaceDesc.fFlags = kRenderTarget_GrSurfaceFlag;
-    tempDrawInfo->fTempSurfaceDesc.fWidth = width;
-    tempDrawInfo->fTempSurfaceDesc.fHeight = height;
-    tempDrawInfo->fTempSurfaceDesc.fSampleCnt = 0;
-    tempDrawInfo->fTempSurfaceDesc.fOrigin = kTopLeft_GrSurfaceOrigin; // no CPU y-flip for TL.
-    tempDrawInfo->fUseExactScratch = this->glCaps().partialFBOReadIsSlow();
-
-    // Start off assuming that any temp draw should be to the readConfig, then check if that will
-    // be inefficient.
-    GrPixelConfig srcConfig = srcSurface->config();
-    tempDrawInfo->fTempSurfaceDesc.fConfig = readConfig;
-
-    if (this->glCaps().rgba8888PixelsOpsAreSlow() && kRGBA_8888_GrPixelConfig == readConfig) {
-        tempDrawInfo->fTempSurfaceDesc.fConfig = kBGRA_8888_GrPixelConfig;
-        tempDrawInfo->fSwapRAndB = true;
-        ElevateDrawPreference(drawPreference, kGpuPrefersDraw_DrawPreference);
-    } else if (kMesa_GrGLDriver == this->glContext().driver() &&
-               GrBytesPerPixel(readConfig) == 4 &&
-               GrPixelConfigSwapRAndB(readConfig) == srcConfig) {
-        // Mesa 3D takes a slow path on when reading back  BGRA from an RGBA surface and vice-versa.
-        // Better to do a draw with a R/B swap and then read as the original config.
-        tempDrawInfo->fTempSurfaceDesc.fConfig = srcConfig;
-        tempDrawInfo->fSwapRAndB = true;
-        ElevateDrawPreference(drawPreference, kGpuPrefersDraw_DrawPreference);
-    } else if (readConfig == kBGRA_8888_GrPixelConfig &&
-               !this->glCaps().readPixelsSupported(this->glInterface(), GR_GL_BGRA,
-                                                   GR_GL_UNSIGNED_BYTE, srcConfig)) {
-        tempDrawInfo->fTempSurfaceDesc.fConfig = kRGBA_8888_GrPixelConfig;
-        tempDrawInfo->fSwapRAndB = true;
-        ElevateDrawPreference(drawPreference, kRequireDraw_DrawPreference);
-    }
-
-    GrRenderTarget* srcAsRT = srcSurface->asRenderTarget();
-    if (!srcAsRT) {
-        ElevateDrawPreference(drawPreference, kRequireDraw_DrawPreference);
-    } else if (read_pixels_pays_for_y_flip(srcAsRT, this->glCaps(), width, height, readConfig,
-                                           rowBytes)) {
-        ElevateDrawPreference(drawPreference, kGpuPrefersDraw_DrawPreference);
-    }
-
-    return true;
-}
-
-bool GrGLGpu::onReadPixels(GrSurface* surface,
-                           int left, int top,
-                           int width, int height,
-                           GrPixelConfig config,
-                           void* buffer,
-                           size_t rowBytes) {
-    SkASSERT(surface);
-
-    GrGLRenderTarget* tgt = static_cast<GrGLRenderTarget*>(surface->asRenderTarget());
-    if (!tgt) {
-        return false;
-    }
-
-    // OpenGL doesn't do sRGB <-> linear conversions when reading and writing pixels.
-    if (GrPixelConfigIsSRGB(surface->config()) != GrPixelConfigIsSRGB(config)) {
-        return false;
-    }
-
-    GrGLenum format = this->glCaps().configGLFormats(config).fExternalFormat;
-    GrGLenum type = this->glCaps().configGLFormats(config).fExternalType;
-    bool flipY = kBottomLeft_GrSurfaceOrigin == surface->origin();
-
-    // resolve the render target if necessary
-    switch (tgt->getResolveType()) {
-        case GrGLRenderTarget::kCantResolve_ResolveType:
-            return false;
-        case GrGLRenderTarget::kAutoResolves_ResolveType:
-            this->flushRenderTarget(tgt, &SkIRect::EmptyIRect());
-            break;
-        case GrGLRenderTarget::kCanResolve_ResolveType:
-            this->onResolveRenderTarget(tgt);
-            // we don't track the state of the READ FBO ID.
-            fStats.incRenderTargetBinds();
-            GL_CALL(BindFramebuffer(GR_GL_READ_FRAMEBUFFER,
-                                    tgt->textureFBOID()));
-            break;
-        default:
-            SkFAIL("Unknown resolve type");
-    }
-
-    const GrGLIRect& glvp = tgt->getViewport();
-
-    // the read rect is viewport-relative
-    GrGLIRect readRect;
-    readRect.setRelativeTo(glvp, left, top, width, height, tgt->origin());
-
-    size_t tightRowBytes = GrBytesPerPixel(config) * width;
-
-    size_t readDstRowBytes = tightRowBytes;
-    void* readDst = buffer;
-
-    // determine if GL can read using the passed rowBytes or if we need
-    // a scratch buffer.
-    SkAutoSMalloc<32 * sizeof(GrColor)> scratch;
-    if (rowBytes != tightRowBytes) {
-        if (this->glCaps().packRowLengthSupport()) {
-            SkASSERT(!(rowBytes % sizeof(GrColor)));
-            GL_CALL(PixelStorei(GR_GL_PACK_ROW_LENGTH,
-                                static_cast<GrGLint>(rowBytes / sizeof(GrColor))));
-            readDstRowBytes = rowBytes;
-        } else {
-            scratch.reset(tightRowBytes * height);
-            readDst = scratch.get();
-        }
-    }
-    if (flipY && this->glCaps().packFlipYSupport()) {
-        GL_CALL(PixelStorei(GR_GL_PACK_REVERSE_ROW_ORDER, 1));
-    }
-    GL_CALL(PixelStorei(GR_GL_PACK_ALIGNMENT, config_alignment(config)));
-
-    GL_CALL(ReadPixels(readRect.fLeft, readRect.fBottom,
-                       readRect.fWidth, readRect.fHeight,
-                       format, type, readDst));
-    if (readDstRowBytes != tightRowBytes) {
-        SkASSERT(this->glCaps().packRowLengthSupport());
-        GL_CALL(PixelStorei(GR_GL_PACK_ROW_LENGTH, 0));
-    }
-    if (flipY && this->glCaps().packFlipYSupport()) {
-        GL_CALL(PixelStorei(GR_GL_PACK_REVERSE_ROW_ORDER, 0));
-        flipY = false;
-    }
-
-    // now reverse the order of the rows, since GL's are bottom-to-top, but our
-    // API presents top-to-bottom. We must preserve the padding contents. Note
-    // that the above readPixels did not overwrite the padding.
-    if (readDst == buffer) {
-        SkASSERT(rowBytes == readDstRowBytes);
-        if (flipY) {
-            scratch.reset(tightRowBytes);
-            void* tmpRow = scratch.get();
-            // flip y in-place by rows
-            const int halfY = height >> 1;
-            char* top = reinterpret_cast<char*>(buffer);
-            char* bottom = top + (height - 1) * rowBytes;
-            for (int y = 0; y < halfY; y++) {
-                memcpy(tmpRow, top, tightRowBytes);
-                memcpy(top, bottom, tightRowBytes);
-                memcpy(bottom, tmpRow, tightRowBytes);
-                top += rowBytes;
-                bottom -= rowBytes;
-            }
-        }
-    } else {
-        SkASSERT(readDst != buffer);        SkASSERT(rowBytes != tightRowBytes);
-        // copy from readDst to buffer while flipping y
-        // const int halfY = height >> 1;
-        const char* src = reinterpret_cast<const char*>(readDst);
-        char* dst = reinterpret_cast<char*>(buffer);
-        if (flipY) {
-            dst += (height-1) * rowBytes;
-        }
-        for (int y = 0; y < height; y++) {
-            memcpy(dst, src, tightRowBytes);
-            src += readDstRowBytes;
-            if (!flipY) {
-                dst += rowBytes;
-            } else {
-                dst -= rowBytes;
-            }
-        }
-    }
-    return true;
-}
-
-void GrGLGpu::flushRenderTarget(GrGLRenderTarget* target, const SkIRect* bound) {
-
-    SkASSERT(target);
-
-    uint32_t rtID = target->getUniqueID();
-    if (fHWBoundRenderTargetUniqueID != rtID) {
-        fStats.incRenderTargetBinds();
-        GL_CALL(BindFramebuffer(GR_GL_FRAMEBUFFER, target->renderFBOID()));
-#ifdef SK_DEBUG
-        // don't do this check in Chromium -- this is causing
-        // lots of repeated command buffer flushes when the compositor is
-        // rendering with Ganesh, which is really slow; even too slow for
-        // Debug mode.
-        if (kChromium_GrGLDriver != this->glContext().driver()) {
-            GrGLenum status;
-            GL_CALL_RET(status, CheckFramebufferStatus(GR_GL_FRAMEBUFFER));
-            if (status != GR_GL_FRAMEBUFFER_COMPLETE) {
-                SkDebugf("GrGLGpu::flushRenderTarget glCheckFramebufferStatus %x\n", status);
-            }
-        }
-#endif
-        fHWBoundRenderTargetUniqueID = rtID;
-        const GrGLIRect& vp = target->getViewport();
-        if (fHWViewport != vp) {
-            vp.pushToGLViewport(this->glInterface());
-            fHWViewport = vp;
-        }
-        if (this->glCaps().srgbWriteControl()) {
-            bool enableSRGBWrite = GrPixelConfigIsSRGB(target->config());
-            if (enableSRGBWrite && kYes_TriState != fHWSRGBFramebuffer) {
-                GL_CALL(Enable(GR_GL_FRAMEBUFFER_SRGB));
-                fHWSRGBFramebuffer = kYes_TriState;
-            } else if (!enableSRGBWrite && kNo_TriState != fHWSRGBFramebuffer) {
-                GL_CALL(Disable(GR_GL_FRAMEBUFFER_SRGB));
-                fHWSRGBFramebuffer = kNo_TriState;
-            }
-        }
-    }
-    if (nullptr == bound || !bound->isEmpty()) {
-        target->flagAsNeedingResolve(bound);
-    }
-
-    GrTexture *texture = target->asTexture();
-    if (texture) {
-        texture->texturePriv().dirtyMipMaps(true);
-    }
-}
-
-GrGLenum gPrimitiveType2GLMode[] = {
-    GR_GL_TRIANGLES,
-    GR_GL_TRIANGLE_STRIP,
-    GR_GL_TRIANGLE_FAN,
-    GR_GL_POINTS,
-    GR_GL_LINES,
-    GR_GL_LINE_STRIP
-};
-
-#define SWAP_PER_DRAW 0
-
-#if SWAP_PER_DRAW
-    #if defined(SK_BUILD_FOR_MAC)
-        #include <AGL/agl.h>
-    #elif defined(SK_BUILD_FOR_WIN32)
-        #include <gl/GL.h>
-        void SwapBuf() {
-            DWORD procID = GetCurrentProcessId();
-            HWND hwnd = GetTopWindow(GetDesktopWindow());
-            while(hwnd) {
-                DWORD wndProcID = 0;
-                GetWindowThreadProcessId(hwnd, &wndProcID);
-                if(wndProcID == procID) {
-                    SwapBuffers(GetDC(hwnd));
-                }
-                hwnd = GetNextWindow(hwnd, GW_HWNDNEXT);
-            }
-         }
-    #endif
-#endif
-
-void GrGLGpu::onDraw(const DrawArgs& args, const GrNonInstancedVertices& vertices) {
-    if (!this->flushGLState(args)) {
-        return;
-    }
-
-    size_t indexOffsetInBytes = 0;
-    this->setupGeometry(*args.fPrimitiveProcessor, vertices, &indexOffsetInBytes);
-
-    SkASSERT((size_t)vertices.primitiveType() < SK_ARRAY_COUNT(gPrimitiveType2GLMode));
-
-    if (vertices.isIndexed()) {
-        GrGLvoid* indices =
-            reinterpret_cast<GrGLvoid*>(indexOffsetInBytes + sizeof(uint16_t) *
-                                        vertices.startIndex());
-        // info.startVertex() was accounted for by setupGeometry.
-        GL_CALL(DrawElements(gPrimitiveType2GLMode[vertices.primitiveType()],
-                             vertices.indexCount(),
-                             GR_GL_UNSIGNED_SHORT,
-                             indices));
-    } else {
-        // Pass 0 for parameter first. We have to adjust glVertexAttribPointer() to account for
-        // startVertex in the DrawElements case. So we always rely on setupGeometry to have
-        // accounted for startVertex.
-        GL_CALL(DrawArrays(gPrimitiveType2GLMode[vertices.primitiveType()], 0,
-                           vertices.vertexCount()));
-    }
-#if SWAP_PER_DRAW
-    glFlush();
-    #if defined(SK_BUILD_FOR_MAC)
-        aglSwapBuffers(aglGetCurrentContext());
-        int set_a_break_pt_here = 9;
-        aglSwapBuffers(aglGetCurrentContext());
-    #elif defined(SK_BUILD_FOR_WIN32)
-        SwapBuf();
-        int set_a_break_pt_here = 9;
-        SwapBuf();
-    #endif
-#endif
-}
-
-void GrGLGpu::onResolveRenderTarget(GrRenderTarget* target) {
-    GrGLRenderTarget* rt = static_cast<GrGLRenderTarget*>(target);
-    if (rt->needsResolve()) {
-        // Some extensions automatically resolves the texture when it is read.
-        if (this->glCaps().usesMSAARenderBuffers()) {
-            SkASSERT(rt->textureFBOID() != rt->renderFBOID());
-            fStats.incRenderTargetBinds();
-            fStats.incRenderTargetBinds();
-            GL_CALL(BindFramebuffer(GR_GL_READ_FRAMEBUFFER, rt->renderFBOID()));
-            GL_CALL(BindFramebuffer(GR_GL_DRAW_FRAMEBUFFER, rt->textureFBOID()));
-            // make sure we go through flushRenderTarget() since we've modified
-            // the bound DRAW FBO ID.
-            fHWBoundRenderTargetUniqueID = SK_InvalidUniqueID;
-            const GrGLIRect& vp = rt->getViewport();
-            const SkIRect dirtyRect = rt->getResolveRect();
-
-            if (GrGLCaps::kES_Apple_MSFBOType == this->glCaps().msFBOType()) {
-                // Apple's extension uses the scissor as the blit bounds.
-                GrScissorState scissorState;
-                scissorState.set(dirtyRect);
-                this->flushScissor(scissorState, vp, rt->origin());
-                GL_CALL(ResolveMultisampleFramebuffer());
-            } else {
-                GrGLIRect r;
-                r.setRelativeTo(vp, dirtyRect.fLeft, dirtyRect.fTop,
-                                dirtyRect.width(), dirtyRect.height(), target->origin());
-
-                int right = r.fLeft + r.fWidth;
-                int top = r.fBottom + r.fHeight;
-
-                // BlitFrameBuffer respects the scissor, so disable it.
-                this->disableScissor();
-                GL_CALL(BlitFramebuffer(r.fLeft, r.fBottom, right, top,
-                                        r.fLeft, r.fBottom, right, top,
-                                        GR_GL_COLOR_BUFFER_BIT, GR_GL_NEAREST));
-            }
-        }
-        rt->flagAsResolved();
-    }
-}
-
-namespace {
-
-
-GrGLenum gr_to_gl_stencil_op(GrStencilOp op) {
-    static const GrGLenum gTable[] = {
-        GR_GL_KEEP,        // kKeep_StencilOp
-        GR_GL_REPLACE,     // kReplace_StencilOp
-        GR_GL_INCR_WRAP,   // kIncWrap_StencilOp
-        GR_GL_INCR,        // kIncClamp_StencilOp
-        GR_GL_DECR_WRAP,   // kDecWrap_StencilOp
-        GR_GL_DECR,        // kDecClamp_StencilOp
-        GR_GL_ZERO,        // kZero_StencilOp
-        GR_GL_INVERT,      // kInvert_StencilOp
-    };
-    GR_STATIC_ASSERT(SK_ARRAY_COUNT(gTable) == kStencilOpCount);
-    GR_STATIC_ASSERT(0 == kKeep_StencilOp);
-    GR_STATIC_ASSERT(1 == kReplace_StencilOp);
-    GR_STATIC_ASSERT(2 == kIncWrap_StencilOp);
-    GR_STATIC_ASSERT(3 == kIncClamp_StencilOp);
-    GR_STATIC_ASSERT(4 == kDecWrap_StencilOp);
-    GR_STATIC_ASSERT(5 == kDecClamp_StencilOp);
-    GR_STATIC_ASSERT(6 == kZero_StencilOp);
-    GR_STATIC_ASSERT(7 == kInvert_StencilOp);
-    SkASSERT((unsigned) op < kStencilOpCount);
-    return gTable[op];
-}
-
-void set_gl_stencil(const GrGLInterface* gl,
-                    const GrStencilSettings& settings,
-                    GrGLenum glFace,
-                    GrStencilSettings::Face grFace) {
-    GrGLenum glFunc = GrToGLStencilFunc(settings.func(grFace));
-    GrGLenum glFailOp = gr_to_gl_stencil_op(settings.failOp(grFace));
-    GrGLenum glPassOp = gr_to_gl_stencil_op(settings.passOp(grFace));
-
-    GrGLint ref = settings.funcRef(grFace);
-    GrGLint mask = settings.funcMask(grFace);
-    GrGLint writeMask = settings.writeMask(grFace);
-
-    if (GR_GL_FRONT_AND_BACK == glFace) {
-        // we call the combined func just in case separate stencil is not
-        // supported.
-        GR_GL_CALL(gl, StencilFunc(glFunc, ref, mask));
-        GR_GL_CALL(gl, StencilMask(writeMask));
-        GR_GL_CALL(gl, StencilOp(glFailOp, GR_GL_KEEP, glPassOp));
-    } else {
-        GR_GL_CALL(gl, StencilFuncSeparate(glFace, glFunc, ref, mask));
-        GR_GL_CALL(gl, StencilMaskSeparate(glFace, writeMask));
-        GR_GL_CALL(gl, StencilOpSeparate(glFace, glFailOp, GR_GL_KEEP, glPassOp));
-    }
-}
-}
-
-void GrGLGpu::flushStencil(const GrStencilSettings& stencilSettings) {
-    if (fHWStencilSettings != stencilSettings) {
-        if (stencilSettings.isDisabled()) {
-            if (kNo_TriState != fHWStencilTestEnabled) {
-                GL_CALL(Disable(GR_GL_STENCIL_TEST));
-                fHWStencilTestEnabled = kNo_TriState;
-            }
-        } else {
-            if (kYes_TriState != fHWStencilTestEnabled) {
-                GL_CALL(Enable(GR_GL_STENCIL_TEST));
-                fHWStencilTestEnabled = kYes_TriState;
-            }
-        }
-        if (!stencilSettings.isDisabled()) {
-            if (this->caps()->twoSidedStencilSupport()) {
-                set_gl_stencil(this->glInterface(),
-                               stencilSettings,
-                               GR_GL_FRONT,
-                               GrStencilSettings::kFront_Face);
-                set_gl_stencil(this->glInterface(),
-                               stencilSettings,
-                               GR_GL_BACK,
-                               GrStencilSettings::kBack_Face);
-            } else {
-                set_gl_stencil(this->glInterface(),
-                               stencilSettings,
-                               GR_GL_FRONT_AND_BACK,
-                               GrStencilSettings::kFront_Face);
-            }
-        }
-        fHWStencilSettings = stencilSettings;
-    }
-}
-
-void GrGLGpu::flushHWAAState(GrRenderTarget* rt, bool useHWAA) {
-    SkASSERT(!useHWAA || rt->isStencilBufferMultisampled());
-
-    if (this->glCaps().multisampleDisableSupport()) {
-        if (useHWAA) {
-            if (kYes_TriState != fMSAAEnabled) {
-                GL_CALL(Enable(GR_GL_MULTISAMPLE));
-                fMSAAEnabled = kYes_TriState;
-            }
-        } else {
-            if (kNo_TriState != fMSAAEnabled) {
-                GL_CALL(Disable(GR_GL_MULTISAMPLE));
-                fMSAAEnabled = kNo_TriState;
-            }
-        }
-    }
-}
-
-void GrGLGpu::flushBlend(const GrXferProcessor::BlendInfo& blendInfo) {
-    // Any optimization to disable blending should have already been applied and
-    // tweaked the equation to "add" or "subtract", and the coeffs to (1, 0).
-
-    GrBlendEquation equation = blendInfo.fEquation;
-    GrBlendCoeff srcCoeff = blendInfo.fSrcBlend;
-    GrBlendCoeff dstCoeff = blendInfo.fDstBlend;
-    bool blendOff = (kAdd_GrBlendEquation == equation || kSubtract_GrBlendEquation == equation) &&
-                    kOne_GrBlendCoeff == srcCoeff && kZero_GrBlendCoeff == dstCoeff;
-    if (blendOff) {
-        if (kNo_TriState != fHWBlendState.fEnabled) {
-            GL_CALL(Disable(GR_GL_BLEND));
-
-            // Workaround for the ARM KHR_blend_equation_advanced blacklist issue
-            // https://code.google.com/p/skia/issues/detail?id=3943
-            if (kARM_GrGLVendor == this->ctxInfo().vendor() &&
-                GrBlendEquationIsAdvanced(fHWBlendState.fEquation)) {
-                SkASSERT(this->caps()->advancedBlendEquationSupport());
-                // Set to any basic blending equation.
-                GrBlendEquation blend_equation = kAdd_GrBlendEquation;
-                GL_CALL(BlendEquation(gXfermodeEquation2Blend[blend_equation]));
-                fHWBlendState.fEquation = blend_equation;
-            }
-
-            fHWBlendState.fEnabled = kNo_TriState;
-        }
-        return;
-    }
-
-    if (kYes_TriState != fHWBlendState.fEnabled) {
-        GL_CALL(Enable(GR_GL_BLEND));
-        fHWBlendState.fEnabled = kYes_TriState;
-    }
-
-    if (fHWBlendState.fEquation != equation) {
-        GL_CALL(BlendEquation(gXfermodeEquation2Blend[equation]));
-        fHWBlendState.fEquation = equation;
-    }
-
-    if (GrBlendEquationIsAdvanced(equation)) {
-        SkASSERT(this->caps()->advancedBlendEquationSupport());
-        // Advanced equations have no other blend state.
-        return;
-    }
-
-    if (fHWBlendState.fSrcCoeff != srcCoeff ||
-        fHWBlendState.fDstCoeff != dstCoeff) {
-        GL_CALL(BlendFunc(gXfermodeCoeff2Blend[srcCoeff],
-                          gXfermodeCoeff2Blend[dstCoeff]));
-        fHWBlendState.fSrcCoeff = srcCoeff;
-        fHWBlendState.fDstCoeff = dstCoeff;
-    }
-
-    GrColor blendConst = blendInfo.fBlendConstant;
-    if ((BlendCoeffReferencesConstant(srcCoeff) ||
-         BlendCoeffReferencesConstant(dstCoeff)) &&
-        (!fHWBlendState.fConstColorValid ||
-         fHWBlendState.fConstColor != blendConst)) {
-        GrGLfloat c[4];
-        GrColorToRGBAFloat(blendConst, c);
-        GL_CALL(BlendColor(c[0], c[1], c[2], c[3]));
-        fHWBlendState.fConstColor = blendConst;
-        fHWBlendState.fConstColorValid = true;
-    }
-}
-
-static inline GrGLenum tile_to_gl_wrap(SkShader::TileMode tm) {
-    static const GrGLenum gWrapModes[] = {
-        GR_GL_CLAMP_TO_EDGE,
-        GR_GL_REPEAT,
-        GR_GL_MIRRORED_REPEAT
-    };
-    GR_STATIC_ASSERT(SkShader::kTileModeCount == SK_ARRAY_COUNT(gWrapModes));
-    GR_STATIC_ASSERT(0 == SkShader::kClamp_TileMode);
-    GR_STATIC_ASSERT(1 == SkShader::kRepeat_TileMode);
-    GR_STATIC_ASSERT(2 == SkShader::kMirror_TileMode);
-    return gWrapModes[tm];
-}
-
-static GrGLenum get_component_enum_from_char(char component) {
-    switch (component) {
-        case 'r':
-           return GR_GL_RED;
-        case 'g':
-           return GR_GL_GREEN;
-        case 'b':
-           return GR_GL_BLUE;
-        case 'a':
-           return GR_GL_ALPHA;
-        default:
-            SkFAIL("Unsupported component");
-            return 0;
-    }
-}
-
-/** If texture swizzling is available using tex parameters then it is preferred over mangling
-  the generated shader code. This potentially allows greater reuse of cached shaders. */
-static void get_tex_param_swizzle(GrPixelConfig config,
-                                  const GrGLSLCaps& caps,
-                                  GrGLenum* glSwizzle) {
-    const char* swizzle = caps.getSwizzleMap(config);
-    for (int i = 0; i < 4; ++i) {
-        glSwizzle[i] = get_component_enum_from_char(swizzle[i]);
-    }
-}
-
-void GrGLGpu::bindTexture(int unitIdx, const GrTextureParams& params, GrGLTexture* texture) {
-    SkASSERT(texture);
-
-#ifdef SK_DEBUG
-    if (!this->caps()->npotTextureTileSupport()) {
-        const bool tileX = SkShader::kClamp_TileMode != params.getTileModeX();
-        const bool tileY = SkShader::kClamp_TileMode != params.getTileModeY();
-        if (tileX || tileY) {
-            const int w = texture->width();
-            const int h = texture->height();
-            SkASSERT(SkIsPow2(w) && SkIsPow2(h));
-        }
-    }
-#endif
-
-    // If we created a rt/tex and rendered to it without using a texture and now we're texturing
-    // from the rt it will still be the last bound texture, but it needs resolving. So keep this
-    // out of the "last != next" check.
-    GrGLRenderTarget* texRT = static_cast<GrGLRenderTarget*>(texture->asRenderTarget());
-    if (texRT) {
-        this->onResolveRenderTarget(texRT);
-    }
-
-    uint32_t textureID = texture->getUniqueID();
-    GrGLenum target = texture->target();
-    if (fHWBoundTextureUniqueIDs[unitIdx] != textureID) {
-        this->setTextureUnit(unitIdx);
-        GL_CALL(BindTexture(target, texture->textureID()));
-        fHWBoundTextureUniqueIDs[unitIdx] = textureID;
-    }
-
-    ResetTimestamp timestamp;
-    const GrGLTexture::TexParams& oldTexParams = texture->getCachedTexParams(&timestamp);
-    bool setAll = timestamp < this->getResetTimestamp();
-    GrGLTexture::TexParams newTexParams;
-
-    static GrGLenum glMinFilterModes[] = {
-        GR_GL_NEAREST,
-        GR_GL_LINEAR,
-        GR_GL_LINEAR_MIPMAP_LINEAR
-    };
-    static GrGLenum glMagFilterModes[] = {
-        GR_GL_NEAREST,
-        GR_GL_LINEAR,
-        GR_GL_LINEAR
-    };
-    GrTextureParams::FilterMode filterMode = params.filterMode();
-
-    if (GrTextureParams::kMipMap_FilterMode == filterMode) {
-        if (!this->caps()->mipMapSupport() || GrPixelConfigIsCompressed(texture->config())) {
-            filterMode = GrTextureParams::kBilerp_FilterMode;
-        }
-    }
-
-    newTexParams.fMinFilter = glMinFilterModes[filterMode];
-    newTexParams.fMagFilter = glMagFilterModes[filterMode];
-
-    if (GrTextureParams::kMipMap_FilterMode == filterMode &&
-        texture->texturePriv().mipMapsAreDirty()) {
-        GL_CALL(GenerateMipmap(target));
-        texture->texturePriv().dirtyMipMaps(false);
-    }
-
-    newTexParams.fWrapS = tile_to_gl_wrap(params.getTileModeX());
-    newTexParams.fWrapT = tile_to_gl_wrap(params.getTileModeY());
-    get_tex_param_swizzle(texture->config(), *this->glCaps().glslCaps(), newTexParams.fSwizzleRGBA);
-    if (setAll || newTexParams.fMagFilter != oldTexParams.fMagFilter) {
-        this->setTextureUnit(unitIdx);
-        GL_CALL(TexParameteri(target, GR_GL_TEXTURE_MAG_FILTER, newTexParams.fMagFilter));
-    }
-    if (setAll || newTexParams.fMinFilter != oldTexParams.fMinFilter) {
-        this->setTextureUnit(unitIdx);
-        GL_CALL(TexParameteri(target, GR_GL_TEXTURE_MIN_FILTER, newTexParams.fMinFilter));
-    }
-    if (setAll || newTexParams.fWrapS != oldTexParams.fWrapS) {
-        this->setTextureUnit(unitIdx);
-        GL_CALL(TexParameteri(target, GR_GL_TEXTURE_WRAP_S, newTexParams.fWrapS));
-    }
-    if (setAll || newTexParams.fWrapT != oldTexParams.fWrapT) {
-        this->setTextureUnit(unitIdx);
-        GL_CALL(TexParameteri(target, GR_GL_TEXTURE_WRAP_T, newTexParams.fWrapT));
-    }
-    if (!this->glCaps().glslCaps()->mustSwizzleInShader() &&
-        (setAll || memcmp(newTexParams.fSwizzleRGBA,
-                          oldTexParams.fSwizzleRGBA,
-                          sizeof(newTexParams.fSwizzleRGBA)))) {
-        this->setTextureUnit(unitIdx);
-        if (this->glStandard() == kGLES_GrGLStandard) {
-            // ES3 added swizzle support but not GL_TEXTURE_SWIZZLE_RGBA.
-            const GrGLenum* swizzle = newTexParams.fSwizzleRGBA;
-            GL_CALL(TexParameteri(target, GR_GL_TEXTURE_SWIZZLE_R, swizzle[0]));
-            GL_CALL(TexParameteri(target, GR_GL_TEXTURE_SWIZZLE_G, swizzle[1]));
-            GL_CALL(TexParameteri(target, GR_GL_TEXTURE_SWIZZLE_B, swizzle[2]));
-            GL_CALL(TexParameteri(target, GR_GL_TEXTURE_SWIZZLE_A, swizzle[3]));
-        } else {
-            GR_STATIC_ASSERT(sizeof(newTexParams.fSwizzleRGBA[0]) == sizeof(GrGLint));
-            const GrGLint* swizzle = reinterpret_cast<const GrGLint*>(newTexParams.fSwizzleRGBA);
-            GL_CALL(TexParameteriv(target, GR_GL_TEXTURE_SWIZZLE_RGBA, swizzle));
-        }
-    }
-    texture->setCachedTexParams(newTexParams, this->getResetTimestamp());
-}
-
-void GrGLGpu::flushColorWrite(bool writeColor) {
-    if (!writeColor) {
-        if (kNo_TriState != fHWWriteToColor) {
-            GL_CALL(ColorMask(GR_GL_FALSE, GR_GL_FALSE,
-                              GR_GL_FALSE, GR_GL_FALSE));
-            fHWWriteToColor = kNo_TriState;
-        }
-    } else {
-        if (kYes_TriState != fHWWriteToColor) {
-            GL_CALL(ColorMask(GR_GL_TRUE, GR_GL_TRUE, GR_GL_TRUE, GR_GL_TRUE));
-            fHWWriteToColor = kYes_TriState;
-        }
-    }
-}
-
-void GrGLGpu::flushDrawFace(GrPipelineBuilder::DrawFace face) {
-    if (fHWDrawFace != face) {
-        switch (face) {
-            case GrPipelineBuilder::kCCW_DrawFace:
-                GL_CALL(Enable(GR_GL_CULL_FACE));
-                GL_CALL(CullFace(GR_GL_BACK));
-                break;
-            case GrPipelineBuilder::kCW_DrawFace:
-                GL_CALL(Enable(GR_GL_CULL_FACE));
-                GL_CALL(CullFace(GR_GL_FRONT));
-                break;
-            case GrPipelineBuilder::kBoth_DrawFace:
-                GL_CALL(Disable(GR_GL_CULL_FACE));
-                break;
-            default:
-                SkFAIL("Unknown draw face.");
-        }
-        fHWDrawFace = face;
-    }
-}
-
-void GrGLGpu::setTextureUnit(int unit) {
-    SkASSERT(unit >= 0 && unit < fHWBoundTextureUniqueIDs.count());
-    if (unit != fHWActiveTextureUnitIdx) {
-        GL_CALL(ActiveTexture(GR_GL_TEXTURE0 + unit));
-        fHWActiveTextureUnitIdx = unit;
-    }
-}
-
-void GrGLGpu::setScratchTextureUnit() {
-    // Bind the last texture unit since it is the least likely to be used by GrGLProgram.
-    int lastUnitIdx = fHWBoundTextureUniqueIDs.count() - 1;
-    if (lastUnitIdx != fHWActiveTextureUnitIdx) {
-        GL_CALL(ActiveTexture(GR_GL_TEXTURE0 + lastUnitIdx));
-        fHWActiveTextureUnitIdx = lastUnitIdx;
-    }
-    // clear out the this field so that if a program does use this unit it will rebind the correct
-    // texture.
-    fHWBoundTextureUniqueIDs[lastUnitIdx] = SK_InvalidUniqueID;
-}
-
-// Determines whether glBlitFramebuffer could be used between src and dst.
-static inline bool can_blit_framebuffer(const GrSurface* dst,
-                                        const GrSurface* src,
-                                        const GrGLGpu* gpu) {
-    if (gpu->glCaps().isConfigRenderable(dst->config(), dst->desc().fSampleCnt > 0) &&
-        gpu->glCaps().isConfigRenderable(src->config(), src->desc().fSampleCnt > 0) &&
-        gpu->glCaps().usesMSAARenderBuffers()) {
-        // ES3 doesn't allow framebuffer blits when the src has MSAA and the configs don't match
-        // or the rects are not the same (not just the same size but have the same edges).
-        if (GrGLCaps::kES_3_0_MSFBOType == gpu->glCaps().msFBOType() &&
-            (src->desc().fSampleCnt > 0 || src->config() != dst->config())) {
-           return false;
-        }
-        const GrGLTexture* dstTex = static_cast<const GrGLTexture*>(dst->asTexture());
-        if (dstTex && dstTex->target() != GR_GL_TEXTURE_2D) {
-            return false;
-        }
-        const GrGLTexture* srcTex = static_cast<const GrGLTexture*>(dst->asTexture());
-        if (srcTex && srcTex->target() != GR_GL_TEXTURE_2D) {
-            return false;
-        }
-        return true;
-    } else {
-        return false;
-    }
-}
-
-static inline bool can_copy_texsubimage(const GrSurface* dst,
-                                        const GrSurface* src,
-                                        const GrGLGpu* gpu) {
-    // Table 3.9 of the ES2 spec indicates the supported formats with CopyTexSubImage
-    // and BGRA isn't in the spec. There doesn't appear to be any extension that adds it. Perhaps
-    // many drivers would allow it to work, but ANGLE does not.
-    if (kGLES_GrGLStandard == gpu->glStandard() && gpu->glCaps().bgraIsInternalFormat() &&
-        (kBGRA_8888_GrPixelConfig == dst->config() || kBGRA_8888_GrPixelConfig == src->config())) {
-        return false;
-    }
-    const GrGLRenderTarget* dstRT = static_cast<const GrGLRenderTarget*>(dst->asRenderTarget());
-    // If dst is multisampled (and uses an extension where there is a separate MSAA renderbuffer)
-    // then we don't want to copy to the texture but to the MSAA buffer.
-    if (dstRT && dstRT->renderFBOID() != dstRT->textureFBOID()) {
-        return false;
-    }
-    const GrGLRenderTarget* srcRT = static_cast<const GrGLRenderTarget*>(src->asRenderTarget());
-    // If the src is multisampled (and uses an extension where there is a separate MSAA
-    // renderbuffer) then it is an invalid operation to call CopyTexSubImage
-    if (srcRT && srcRT->renderFBOID() != srcRT->textureFBOID()) {
-        return false;
-    }
-
-    const GrGLTexture* dstTex = static_cast<const GrGLTexture*>(dst->asTexture());
-    // CopyTex(Sub)Image writes to a texture and we have no way of dynamically wrapping a RT in a
-    // texture.
-    if (!dstTex) {
-        return false;
-    }
-
-    const GrGLTexture* srcTex = static_cast<const GrGLTexture*>(src->asTexture());
-    
-    // Check that we could wrap the source in an FBO, that the dst is TEXTURE_2D, that no mirroring
-    // is required.
-    if (gpu->glCaps().isConfigRenderable(src->config(), src->desc().fSampleCnt > 0) &&
-        !GrPixelConfigIsCompressed(src->config()) &&
-        (!srcTex || srcTex->target() == GR_GL_TEXTURE_2D) &&
-        dstTex->target() == GR_GL_TEXTURE_2D &&
-        dst->origin() == src->origin()) {
-        return true;
-    } else {
-        return false;
-    }
-}
-
-// If a temporary FBO was created, its non-zero ID is returned. The viewport that the copy rect is
-// relative to is output.
-void GrGLGpu::bindSurfaceFBOForCopy(GrSurface* surface, GrGLenum fboTarget, GrGLIRect* viewport,
-                                    TempFBOTarget tempFBOTarget) {
-    GrGLRenderTarget* rt = static_cast<GrGLRenderTarget*>(surface->asRenderTarget());
-    if (nullptr == rt) {
-        SkASSERT(surface->asTexture());
-        GrGLuint texID = static_cast<GrGLTexture*>(surface->asTexture())->textureID();
-        GrGLenum target = static_cast<GrGLTexture*>(surface->asTexture())->target();
-        GrGLuint* tempFBOID;
-        tempFBOID = kSrc_TempFBOTarget == tempFBOTarget ? &fTempSrcFBOID : &fTempDstFBOID;
-
-        if (0 == *tempFBOID) {
-            GR_GL_CALL(this->glInterface(), GenFramebuffers(1, tempFBOID));
-        }
-
-        fStats.incRenderTargetBinds();
-        GR_GL_CALL(this->glInterface(), BindFramebuffer(fboTarget, *tempFBOID));
-        GR_GL_CALL(this->glInterface(), FramebufferTexture2D(fboTarget,
-                                                             GR_GL_COLOR_ATTACHMENT0,
-                                                             target,
-                                                             texID,
-                                                             0));
-        viewport->fLeft = 0;
-        viewport->fBottom = 0;
-        viewport->fWidth = surface->width();
-        viewport->fHeight = surface->height();
-    } else {
-        fStats.incRenderTargetBinds();
-        GR_GL_CALL(this->glInterface(), BindFramebuffer(fboTarget, rt->renderFBOID()));
-        *viewport = rt->getViewport();
-    }
-}
-
-void GrGLGpu::unbindTextureFBOForCopy(GrGLenum fboTarget, GrSurface* surface) {
-    // bindSurfaceFBOForCopy temporarily binds textures that are not render targets to 
-    if (!surface->asRenderTarget()) {
-        SkASSERT(surface->asTexture());
-        GrGLenum textureTarget = static_cast<GrGLTexture*>(surface->asTexture())->target();
-        GR_GL_CALL(this->glInterface(), FramebufferTexture2D(fboTarget,
-                                                             GR_GL_COLOR_ATTACHMENT0,
-                                                             textureTarget,
-                                                             0,
-                                                             0));
-    }
-}
-
-bool GrGLGpu::initCopySurfaceDstDesc(const GrSurface* src, GrSurfaceDesc* desc) const {
-    // If the src is a texture, we can implement the blit as a draw assuming the config is
-    // renderable.
-    if (src->asTexture() && this->caps()->isConfigRenderable(src->config(), false)) {
-        desc->fOrigin = kDefault_GrSurfaceOrigin;
-        desc->fFlags = kRenderTarget_GrSurfaceFlag;
-        desc->fConfig = src->config();
-        return true;
-    }
-
-    const GrGLTexture* srcTexture = static_cast<const GrGLTexture*>(src->asTexture());
-    if (srcTexture && srcTexture->target() != GR_GL_TEXTURE_2D) {
-        // Not supported for FBO blit or CopyTexSubImage
-        return false;
-    }
-
-    // We look for opportunities to use CopyTexSubImage, or fbo blit. If neither are
-    // possible and we return false to fallback to creating a render target dst for render-to-
-    // texture. This code prefers CopyTexSubImage to fbo blit and avoids triggering temporary fbo
-    // creation. It isn't clear that avoiding temporary fbo creation is actually optimal.
-
-    // Check for format issues with glCopyTexSubImage2D
-    if (kGLES_GrGLStandard == this->glStandard() && this->glCaps().bgraIsInternalFormat() &&
-        kBGRA_8888_GrPixelConfig == src->config()) {
-        // glCopyTexSubImage2D doesn't work with this config. If the bgra can be used with fbo blit
-        // then we set up for that, otherwise fail.
-        if (this->caps()->isConfigRenderable(kBGRA_8888_GrPixelConfig, false)) {
-            desc->fOrigin = kDefault_GrSurfaceOrigin;
-            desc->fFlags = kRenderTarget_GrSurfaceFlag;
-            desc->fConfig = kBGRA_8888_GrPixelConfig;
-            return true;
-        }
-        return false;
-    } else if (nullptr == src->asRenderTarget()) {
-        // CopyTexSubImage2D or fbo blit would require creating a temp fbo for the src.
-        return false;
-    }
-
-    const GrGLRenderTarget* srcRT = static_cast<const GrGLRenderTarget*>(src->asRenderTarget());
-    if (srcRT && srcRT->renderFBOID() != srcRT->textureFBOID()) {
-        // It's illegal to call CopyTexSubImage2D on a MSAA renderbuffer. Set up for FBO blit or
-        // fail.
-        if (this->caps()->isConfigRenderable(src->config(), false)) {
-            desc->fOrigin = kDefault_GrSurfaceOrigin;
-            desc->fFlags = kRenderTarget_GrSurfaceFlag;
-            desc->fConfig = src->config();
-            return true;
-        }
-        return false;
-    }
-
-    // We'll do a CopyTexSubImage. Make the dst a plain old texture.
-    desc->fConfig = src->config();
-    desc->fOrigin = src->origin();
-    desc->fFlags = kNone_GrSurfaceFlags;
-    return true;
-}
-
-bool GrGLGpu::onCopySurface(GrSurface* dst,
-                            GrSurface* src,
-                            const SkIRect& srcRect,
-                            const SkIPoint& dstPoint) {
-    if (src->asTexture() && dst->asRenderTarget()) {
-        this->copySurfaceAsDraw(dst, src, srcRect, dstPoint);
-        return true;
-    }
-    
-    if (can_copy_texsubimage(dst, src, this)) {
-        this->copySurfaceAsCopyTexSubImage(dst, src, srcRect, dstPoint);
-        return true;
-    }
-
-    if (can_blit_framebuffer(dst, src, this)) {
-        return this->copySurfaceAsBlitFramebuffer(dst, src, srcRect, dstPoint);
-    }
-
-    return false;
-}
-
-void GrGLGpu::createCopyPrograms() {
-    for (size_t i = 0; i < SK_ARRAY_COUNT(fCopyPrograms); ++i) {
-        fCopyPrograms[i].fProgram = 0;
-    }
-    const char* version = this->glCaps().glslCaps()->versionDeclString();
-    static const GrSLType kSamplerTypes[2] = { kSampler2D_GrSLType, kSamplerExternal_GrSLType };
-    SkASSERT(2 == SK_ARRAY_COUNT(fCopyPrograms));
-    int programCount = this->glCaps().externalTextureSupport() ? 2 : 1;
-    for (int i = 0; i < programCount; ++i) {
-        GrGLSLShaderVar aVertex("a_vertex", kVec2f_GrSLType, GrShaderVar::kAttribute_TypeModifier);
-        GrGLSLShaderVar uTexCoordXform("u_texCoordXform", kVec4f_GrSLType,
-                                     GrShaderVar::kUniform_TypeModifier);
-        GrGLSLShaderVar uPosXform("u_posXform", kVec4f_GrSLType,
-                                  GrShaderVar::kUniform_TypeModifier);
-        GrGLSLShaderVar uTexture("u_texture", kSamplerTypes[i],
-                                 GrShaderVar::kUniform_TypeModifier);
-        GrGLSLShaderVar vTexCoord("v_texCoord", kVec2f_GrSLType,
-                                  GrShaderVar::kVaryingOut_TypeModifier);
-        GrGLSLShaderVar oFragColor("o_FragColor", kVec4f_GrSLType,
-                                   GrShaderVar::kOut_TypeModifier);
-
-        SkString vshaderTxt(version);
-        aVertex.appendDecl(this->glCaps().glslCaps(), &vshaderTxt);
-        vshaderTxt.append(";");
-        uTexCoordXform.appendDecl(this->glCaps().glslCaps(), &vshaderTxt);
-        vshaderTxt.append(";");
-        uPosXform.appendDecl(this->glCaps().glslCaps(), &vshaderTxt);
-        vshaderTxt.append(";");
-        vTexCoord.appendDecl(this->glCaps().glslCaps(), &vshaderTxt);
-        vshaderTxt.append(";");
-    
-        vshaderTxt.append(
-            "// Copy Program VS\n"
-            "void main() {"
-            "  v_texCoord = a_vertex.xy * u_texCoordXform.xy + u_texCoordXform.zw;"
-            "  gl_Position.xy = a_vertex * u_posXform.xy + u_posXform.zw;"
-            "  gl_Position.zw = vec2(0, 1);"
-            "}"
-        );
-
-        SkString fshaderTxt(version);
-        if (kSamplerTypes[i] == kSamplerExternal_GrSLType) {
-            fshaderTxt.appendf("#extension %s : require\n",
-                               this->glCaps().glslCaps()->externalTextureExtensionString());
-        }
-        GrGLSLAppendDefaultFloatPrecisionDeclaration(kDefault_GrSLPrecision,
-                                                     *this->glCaps().glslCaps(),
-                                                     &fshaderTxt);
-        vTexCoord.setTypeModifier(GrShaderVar::kVaryingIn_TypeModifier);
-        vTexCoord.appendDecl(this->glCaps().glslCaps(), &fshaderTxt);
-        fshaderTxt.append(";");
-        uTexture.appendDecl(this->glCaps().glslCaps(), &fshaderTxt);
-        fshaderTxt.append(";");
-        const char* fsOutName;
-        if (this->glCaps().glslCaps()->mustDeclareFragmentShaderOutput()) {
-            oFragColor.appendDecl(this->glCaps().glslCaps(), &fshaderTxt);
-            fshaderTxt.append(";");
-            fsOutName = oFragColor.c_str();
-        } else {
-            fsOutName = "gl_FragColor";
-        }
-        fshaderTxt.appendf(
-            "// Copy Program FS\n"
-            "void main() {"
-            "  %s = %s(u_texture, v_texCoord);"
-            "}",
-            fsOutName,
-            GrGLSLTexture2DFunctionName(kVec2f_GrSLType, this->glslGeneration())
-        );
-    
-        GL_CALL_RET(fCopyPrograms[i].fProgram, CreateProgram());
-        const char* str;
-        GrGLint length;
-
-        str = vshaderTxt.c_str();
-        length = SkToInt(vshaderTxt.size());
-        GrGLuint vshader = GrGLCompileAndAttachShader(*fGLContext, fCopyPrograms[i].fProgram,
-                                                      GR_GL_VERTEX_SHADER, &str, &length, 1,
-                                                      &fStats);
-
-        str = fshaderTxt.c_str();
-        length = SkToInt(fshaderTxt.size());
-        GrGLuint fshader = GrGLCompileAndAttachShader(*fGLContext, fCopyPrograms[i].fProgram,
-                                                      GR_GL_FRAGMENT_SHADER, &str, &length, 1,
-                                                      &fStats);
-
-        GL_CALL(LinkProgram(fCopyPrograms[i].fProgram));
-
-        GL_CALL_RET(fCopyPrograms[i].fTextureUniform,
-                    GetUniformLocation(fCopyPrograms[i].fProgram, "u_texture"));
-        GL_CALL_RET(fCopyPrograms[i].fPosXformUniform,
-                    GetUniformLocation(fCopyPrograms[i].fProgram, "u_posXform"));
-        GL_CALL_RET(fCopyPrograms[i].fTexCoordXformUniform,
-                    GetUniformLocation(fCopyPrograms[i].fProgram, "u_texCoordXform"));
-
-        GL_CALL(BindAttribLocation(fCopyPrograms[i].fProgram, 0, "a_vertex"));
-
-        GL_CALL(DeleteShader(vshader));
-        GL_CALL(DeleteShader(fshader));
-    }
-    fCopyProgramArrayBuffer = 0;
-    GL_CALL(GenBuffers(1, &fCopyProgramArrayBuffer));
-    fHWGeometryState.setVertexBufferID(this, fCopyProgramArrayBuffer);
-    static const GrGLfloat vdata[] = {
-        0, 0,
-        0, 1,
-        1, 0,
-        1, 1
-    };
-    GL_ALLOC_CALL(this->glInterface(),
-                  BufferData(GR_GL_ARRAY_BUFFER,
-                             (GrGLsizeiptr) sizeof(vdata),
-                             vdata,  // data ptr
-                             GR_GL_STATIC_DRAW));
-}
-
-void GrGLGpu::createWireRectProgram() {
-    SkASSERT(!fWireRectProgram.fProgram);
-    GrGLSLShaderVar uColor("u_color", kVec4f_GrSLType, GrShaderVar::kUniform_TypeModifier);
-    GrGLSLShaderVar uRect("u_rect", kVec4f_GrSLType, GrShaderVar::kUniform_TypeModifier);
-    GrGLSLShaderVar aVertex("a_vertex", kVec2f_GrSLType, GrShaderVar::kAttribute_TypeModifier);
-    const char* version = this->glCaps().glslCaps()->versionDeclString();
-
-    // The rect uniform specifies the rectangle in NDC space as a vec4 (left,top,right,bottom). The
-    // program is used with a vbo containing the unit square. Vertices are computed from the rect
-    // uniform using the 4 vbo vertices.
-    SkString vshaderTxt(version);
-    aVertex.appendDecl(this->glCaps().glslCaps(), &vshaderTxt);
-    vshaderTxt.append(";");
-    uRect.appendDecl(this->glCaps().glslCaps(), &vshaderTxt);
-    vshaderTxt.append(";");
-    vshaderTxt.append(
-        "// Wire Rect Program VS\n"
-        "void main() {"
-        "  gl_Position.x = u_rect.x + a_vertex.x * (u_rect.z - u_rect.x);"
-        "  gl_Position.y = u_rect.y + a_vertex.y * (u_rect.w - u_rect.y);"
-        "  gl_Position.zw = vec2(0, 1);"
-        "}"
-    );
-
-    GrGLSLShaderVar oFragColor("o_FragColor", kVec4f_GrSLType, GrShaderVar::kOut_TypeModifier);
-
-    SkString fshaderTxt(version);
-    GrGLSLAppendDefaultFloatPrecisionDeclaration(kDefault_GrSLPrecision,
-                                                 *this->glCaps().glslCaps(),
-                                                 &fshaderTxt);
-    uColor.appendDecl(this->glCaps().glslCaps(), &fshaderTxt);
-    fshaderTxt.append(";");
-    const char* fsOutName;
-    if (this->glCaps().glslCaps()->mustDeclareFragmentShaderOutput()) {
-        oFragColor.appendDecl(this->glCaps().glslCaps(), &fshaderTxt);
-        fshaderTxt.append(";");
-        fsOutName = oFragColor.c_str();
-    } else {
-        fsOutName = "gl_FragColor";
-    }
-    fshaderTxt.appendf(
-        "// Write Rect Program FS\n"
-        "void main() {"
-        "  %s = %s;"
-        "}",
-        fsOutName,
-        uColor.c_str()
-    );
-
-    GL_CALL_RET(fWireRectProgram.fProgram, CreateProgram());
-    const char* str;
-    GrGLint length;
-
-    str = vshaderTxt.c_str();
-    length = SkToInt(vshaderTxt.size());
-    GrGLuint vshader = GrGLCompileAndAttachShader(*fGLContext, fWireRectProgram.fProgram,
-                                                  GR_GL_VERTEX_SHADER, &str, &length, 1,
-                                                  &fStats);
-
-    str = fshaderTxt.c_str();
-    length = SkToInt(fshaderTxt.size());
-    GrGLuint fshader = GrGLCompileAndAttachShader(*fGLContext, fWireRectProgram.fProgram,
-                                                  GR_GL_FRAGMENT_SHADER, &str, &length, 1,
-                                                  &fStats);
-
-    GL_CALL(LinkProgram(fWireRectProgram.fProgram));
-
-    GL_CALL_RET(fWireRectProgram.fColorUniform,
-                GetUniformLocation(fWireRectProgram.fProgram, "u_color"));
-    GL_CALL_RET(fWireRectProgram.fRectUniform,
-                GetUniformLocation(fWireRectProgram.fProgram, "u_rect"));
-    GL_CALL(BindAttribLocation(fWireRectProgram.fProgram, 0, "a_vertex"));
-
-    GL_CALL(DeleteShader(vshader));
-    GL_CALL(DeleteShader(fshader));
-    GL_CALL(GenBuffers(1, &fWireRectArrayBuffer));
-    fHWGeometryState.setVertexBufferID(this, fWireRectArrayBuffer);
-    static const GrGLfloat vdata[] = {
-        0, 0,
-        0, 1,
-        1, 1,
-        1, 0,
-    };
-    GL_ALLOC_CALL(this->glInterface(),
-                  BufferData(GR_GL_ARRAY_BUFFER,
-                             (GrGLsizeiptr) sizeof(vdata),
-                             vdata,  // data ptr
-                             GR_GL_STATIC_DRAW));
-}
-
-void GrGLGpu::drawDebugWireRect(GrRenderTarget* rt, const SkIRect& rect, GrColor color) {
-    this->handleDirtyContext();
-    if (!fWireRectProgram.fProgram) {
-        this->createWireRectProgram();
-    }
-
-    int w = rt->width();
-    int h = rt->height();
-
-    // Compute the edges of the rectangle (top,left,right,bottom) in NDC space. Must consider
-    // whether the render target is flipped or not.
-    GrGLfloat edges[4];
-    edges[0] = SkIntToScalar(rect.fLeft) + 0.5f;
-    edges[2] = SkIntToScalar(rect.fRight) - 0.5f;
-    if (kBottomLeft_GrSurfaceOrigin == rt->origin()) {
-        edges[1] = h - (SkIntToScalar(rect.fTop) + 0.5f);
-        edges[3] = h - (SkIntToScalar(rect.fBottom) - 0.5f);
-    } else {
-        edges[1] = SkIntToScalar(rect.fTop) + 0.5f;
-        edges[3] = SkIntToScalar(rect.fBottom) - 0.5f;
-    }
-    edges[0] = 2 * edges[0] / w - 1.0f;
-    edges[1] = 2 * edges[1] / h - 1.0f;
-    edges[2] = 2 * edges[2] / w - 1.0f;
-    edges[3] = 2 * edges[3] / h - 1.0f;
-
-    GrGLfloat channels[4];
-    static const GrGLfloat scale255 = 1.f / 255.f;
-    channels[0] = GrColorUnpackR(color) * scale255;
-    channels[1] = GrColorUnpackG(color) * scale255;
-    channels[2] = GrColorUnpackB(color) * scale255;
-    channels[3] = GrColorUnpackA(color) * scale255;
-
-    GrGLRenderTarget* glRT = static_cast<GrGLRenderTarget*>(rt->asRenderTarget());
-    this->flushRenderTarget(glRT, &rect);
-
-    GL_CALL(UseProgram(fWireRectProgram.fProgram));
-    fHWProgramID = fWireRectProgram.fProgram;
-
-    fHWGeometryState.setVertexArrayID(this, 0);
-
-    GrGLAttribArrayState* attribs =
-        fHWGeometryState.bindArrayAndBufferToDraw(this, fWireRectArrayBuffer);
-    attribs->set(this, 0, fWireRectArrayBuffer, 2, GR_GL_FLOAT, false, 2 * sizeof(GrGLfloat), 0);
-    attribs->disableUnusedArrays(this, 0x1);
-
-    GL_CALL(Uniform4fv(fWireRectProgram.fRectUniform, 1, edges));
-    GL_CALL(Uniform4fv(fWireRectProgram.fColorUniform, 1, channels));
-
-    GrXferProcessor::BlendInfo blendInfo;
-    blendInfo.reset();
-    this->flushBlend(blendInfo);
-    this->flushColorWrite(true);
-    this->flushDrawFace(GrPipelineBuilder::kBoth_DrawFace);
-    this->flushHWAAState(glRT, false);
-    this->disableScissor();
-    GrStencilSettings stencil;
-    stencil.setDisabled();
-    this->flushStencil(stencil);
-
-    GL_CALL(DrawArrays(GR_GL_LINE_LOOP, 0, 4));
-}
-
-
-void GrGLGpu::copySurfaceAsDraw(GrSurface* dst,
-                                GrSurface* src,
-                                const SkIRect& srcRect,
-                                const SkIPoint& dstPoint) {
-    int w = srcRect.width();
-    int h = srcRect.height();
-
-    GrGLTexture* srcTex = static_cast<GrGLTexture*>(src->asTexture());
-    GrTextureParams params(SkShader::kClamp_TileMode, GrTextureParams::kNone_FilterMode);
-    this->bindTexture(0, params, srcTex);
-
-    GrGLRenderTarget* dstRT = static_cast<GrGLRenderTarget*>(dst->asRenderTarget());
-    SkIRect dstRect = SkIRect::MakeXYWH(dstPoint.fX, dstPoint.fY, w, h);
-    this->flushRenderTarget(dstRT, &dstRect);
-
-    int progIdx = TextureTargetToCopyProgramIdx(srcTex->target());
-
-    GL_CALL(UseProgram(fCopyPrograms[progIdx].fProgram));
-    fHWProgramID = fCopyPrograms[progIdx].fProgram;
-
-    fHWGeometryState.setVertexArrayID(this, 0);
-
-    GrGLAttribArrayState* attribs =
-        fHWGeometryState.bindArrayAndBufferToDraw(this, fCopyProgramArrayBuffer);
-    attribs->set(this, 0, fCopyProgramArrayBuffer, 2, GR_GL_FLOAT, false, 2 * sizeof(GrGLfloat), 0);
-    attribs->disableUnusedArrays(this, 0x1);
-
-    // dst rect edges in NDC (-1 to 1)
-    int dw = dst->width();
-    int dh = dst->height();
-    GrGLfloat dx0 = 2.f * dstPoint.fX / dw - 1.f;
-    GrGLfloat dx1 = 2.f * (dstPoint.fX + w) / dw - 1.f;
-    GrGLfloat dy0 = 2.f * dstPoint.fY / dh - 1.f;
-    GrGLfloat dy1 = 2.f * (dstPoint.fY + h) / dh - 1.f;
-    if (kBottomLeft_GrSurfaceOrigin == dst->origin()) {
-        dy0 = -dy0;
-        dy1 = -dy1;
-    }
-
-    // src rect edges in normalized texture space (0 to 1)
-    int sw = src->width();
-    int sh = src->height();
-    GrGLfloat sx0 = (GrGLfloat)srcRect.fLeft / sw;
-    GrGLfloat sx1 = (GrGLfloat)(srcRect.fLeft + w) / sw;
-    GrGLfloat sy0 = (GrGLfloat)srcRect.fTop / sh;
-    GrGLfloat sy1 = (GrGLfloat)(srcRect.fTop + h) / sh;
-    if (kBottomLeft_GrSurfaceOrigin == src->origin()) {
-        sy0 = 1.f - sy0;
-        sy1 = 1.f - sy1;
-    }
-
-    GL_CALL(Uniform4f(fCopyPrograms[progIdx].fPosXformUniform, dx1 - dx0, dy1 - dy0, dx0, dy0));
-    GL_CALL(Uniform4f(fCopyPrograms[progIdx].fTexCoordXformUniform,
-                      sx1 - sx0, sy1 - sy0, sx0, sy0));
-    GL_CALL(Uniform1i(fCopyPrograms[progIdx].fTextureUniform, 0));
-
-    GrXferProcessor::BlendInfo blendInfo;
-    blendInfo.reset();
-    this->flushBlend(blendInfo);
-    this->flushColorWrite(true);
-    this->flushDrawFace(GrPipelineBuilder::kBoth_DrawFace);
-    this->flushHWAAState(dstRT, false);
-    this->disableScissor();
-    GrStencilSettings stencil;
-    stencil.setDisabled();
-    this->flushStencil(stencil);
-
-    GL_CALL(DrawArrays(GR_GL_TRIANGLE_STRIP, 0, 4));
-}
-
-void GrGLGpu::copySurfaceAsCopyTexSubImage(GrSurface* dst,
-                                           GrSurface* src,
-                                           const SkIRect& srcRect,
-                                           const SkIPoint& dstPoint) {
-    SkASSERT(can_copy_texsubimage(dst, src, this));
-    GrGLIRect srcVP;
-    this->bindSurfaceFBOForCopy(src, GR_GL_FRAMEBUFFER, &srcVP, kSrc_TempFBOTarget);
-    GrGLTexture* dstTex = static_cast<GrGLTexture*>(dst->asTexture());
-    SkASSERT(dstTex);
-    // We modified the bound FBO
-    fHWBoundRenderTargetUniqueID = SK_InvalidUniqueID;
-    GrGLIRect srcGLRect;
-    srcGLRect.setRelativeTo(srcVP,
-                            srcRect.fLeft,
-                            srcRect.fTop,
-                            srcRect.width(),
-                            srcRect.height(),
-                            src->origin());
-
-    this->setScratchTextureUnit();
-    GL_CALL(BindTexture(dstTex->target(), dstTex->textureID()));
-    GrGLint dstY;
-    if (kBottomLeft_GrSurfaceOrigin == dst->origin()) {
-        dstY = dst->height() - (dstPoint.fY + srcGLRect.fHeight);
-    } else {
-        dstY = dstPoint.fY;
-    }
-    GL_CALL(CopyTexSubImage2D(dstTex->target(), 0,
-                                dstPoint.fX, dstY,
-                                srcGLRect.fLeft, srcGLRect.fBottom,
-                                srcGLRect.fWidth, srcGLRect.fHeight));
-    this->unbindTextureFBOForCopy(GR_GL_FRAMEBUFFER, src);
-}
-
-bool GrGLGpu::copySurfaceAsBlitFramebuffer(GrSurface* dst,
-                                           GrSurface* src,
-                                           const SkIRect& srcRect,
-                                           const SkIPoint& dstPoint) {
-    SkASSERT(can_blit_framebuffer(dst, src, this));
-    SkIRect dstRect = SkIRect::MakeXYWH(dstPoint.fX, dstPoint.fY,
-                                        srcRect.width(), srcRect.height());
-    if (dst == src) {
-        if (SkIRect::IntersectsNoEmptyCheck(dstRect, srcRect)) {
-            return false;
-        }
-    }
-
-    GrGLIRect dstVP;
-    GrGLIRect srcVP;
-    this->bindSurfaceFBOForCopy(dst, GR_GL_DRAW_FRAMEBUFFER, &dstVP, kDst_TempFBOTarget);
-    this->bindSurfaceFBOForCopy(src, GR_GL_READ_FRAMEBUFFER, &srcVP, kSrc_TempFBOTarget);
-    // We modified the bound FBO
-    fHWBoundRenderTargetUniqueID = SK_InvalidUniqueID;
-    GrGLIRect srcGLRect;
-    GrGLIRect dstGLRect;
-    srcGLRect.setRelativeTo(srcVP,
-                            srcRect.fLeft,
-                            srcRect.fTop,
-                            srcRect.width(),
-                            srcRect.height(),
-                            src->origin());
-    dstGLRect.setRelativeTo(dstVP,
-                            dstRect.fLeft,
-                            dstRect.fTop,
-                            dstRect.width(),
-                            dstRect.height(),
-                            dst->origin());
-
-    // BlitFrameBuffer respects the scissor, so disable it.
-    this->disableScissor();
-
-    GrGLint srcY0;
-    GrGLint srcY1;
-    // Does the blit need to y-mirror or not?
-    if (src->origin() == dst->origin()) {
-        srcY0 = srcGLRect.fBottom;
-        srcY1 = srcGLRect.fBottom + srcGLRect.fHeight;
-    } else {
-        srcY0 = srcGLRect.fBottom + srcGLRect.fHeight;
-        srcY1 = srcGLRect.fBottom;
-    }
-    GL_CALL(BlitFramebuffer(srcGLRect.fLeft,
-                            srcY0,
-                            srcGLRect.fLeft + srcGLRect.fWidth,
-                            srcY1,
-                            dstGLRect.fLeft,
-                            dstGLRect.fBottom,
-                            dstGLRect.fLeft + dstGLRect.fWidth,
-                            dstGLRect.fBottom + dstGLRect.fHeight,
-                            GR_GL_COLOR_BUFFER_BIT, GR_GL_NEAREST));
-    this->unbindTextureFBOForCopy(GR_GL_DRAW_FRAMEBUFFER, dst);
-    this->unbindTextureFBOForCopy(GR_GL_READ_FRAMEBUFFER, src);
-    return true;
-}
-
-void GrGLGpu::xferBarrier(GrRenderTarget* rt, GrXferBarrierType type) {
-    SkASSERT(type);
-    switch (type) {
-        case kTexture_GrXferBarrierType: {
-            GrGLRenderTarget* glrt = static_cast<GrGLRenderTarget*>(rt);
-            if (glrt->textureFBOID() != glrt->renderFBOID()) {
-                // The render target uses separate storage so no need for glTextureBarrier.
-                // FIXME: The render target will resolve automatically when its texture is bound,
-                // but we could resolve only the bounds that will be read if we do it here instead.
-                return;
-            }
-            SkASSERT(this->caps()->textureBarrierSupport());
-            GL_CALL(TextureBarrier());
-            return;
-        }
-        case kBlend_GrXferBarrierType:
-            SkASSERT(GrCaps::kAdvanced_BlendEquationSupport ==
-                     this->caps()->blendEquationSupport());
-            GL_CALL(BlendBarrier());
-            return;
-        default: break; // placate compiler warnings that kNone not handled
-    }
-}
-
-GrBackendObject GrGLGpu::createTestingOnlyBackendTexture(void* pixels, int w, int h,
-                                                         GrPixelConfig config) const {
-    if (!this->caps()->isConfigTexturable(config)) {
-        return false;
-    }
-    GrGLTextureInfo* info = new GrGLTextureInfo;
-    info->fTarget = GR_GL_TEXTURE_2D;
-    info->fID = 0;
-    GL_CALL(GenTextures(1, &info->fID));
-    GL_CALL(ActiveTexture(GR_GL_TEXTURE0));
-    GL_CALL(PixelStorei(GR_GL_UNPACK_ALIGNMENT, 1));
-    GL_CALL(BindTexture(info->fTarget, info->fID));
-    GL_CALL(TexParameteri(info->fTarget, GR_GL_TEXTURE_MAG_FILTER, GR_GL_NEAREST));
-    GL_CALL(TexParameteri(info->fTarget, GR_GL_TEXTURE_MIN_FILTER, GR_GL_NEAREST));
-    GL_CALL(TexParameteri(info->fTarget, GR_GL_TEXTURE_WRAP_S, GR_GL_CLAMP_TO_EDGE));
-    GL_CALL(TexParameteri(info->fTarget, GR_GL_TEXTURE_WRAP_T, GR_GL_CLAMP_TO_EDGE));
-
-    GrGLenum internalFormat = this->glCaps().configGLFormats(config).fInternalFormatTexImage;
-    GrGLenum externalFormat = this->glCaps().configGLFormats(config).fExternalFormatForTexImage;
-    GrGLenum externalType = this->glCaps().configGLFormats(config).fExternalType;
-
-    GL_CALL(TexImage2D(info->fTarget, 0, internalFormat, w, h, 0, externalFormat,
-                       externalType, pixels));
-
-#ifdef SK_IGNORE_GL_TEXTURE_TARGET
-    GrGLuint id = info->fID;
-    delete info;
-    return id;
-#else
-    return reinterpret_cast<GrBackendObject>(info);
-#endif
-}
-
-bool GrGLGpu::isTestingOnlyBackendTexture(GrBackendObject id) const {
-#ifdef SK_IGNORE_GL_TEXTURE_TARGET
-    GrGLuint texID = (GrGLuint)id;
-#else
-    GrGLuint texID = reinterpret_cast<const GrGLTextureInfo*>(id)->fID;
-#endif
-
-    GrGLboolean result;
-    GL_CALL_RET(result, IsTexture(texID));
-
-    return (GR_GL_TRUE == result);
-}
-
-void GrGLGpu::deleteTestingOnlyBackendTexture(GrBackendObject id, bool abandonTexture) const {
-#ifdef SK_IGNORE_GL_TEXTURE_TARGET
-    GrGLuint texID = (GrGLuint)id;
-#else
-    const GrGLTextureInfo* info = reinterpret_cast<const GrGLTextureInfo*>(id);
-    GrGLuint texID = info->fID;
-#endif
-
-    if (!abandonTexture) {
-        GL_CALL(DeleteTextures(1, &texID));
-    }
-
-#ifndef SK_IGNORE_GL_TEXTURE_TARGET
-    delete info;
-#endif
-}
-
-void GrGLGpu::resetShaderCacheForTesting() const {
-    fProgramCache->abandon();
-}
-
-///////////////////////////////////////////////////////////////////////////////
-GrGLAttribArrayState* GrGLGpu::HWGeometryState::bindArrayAndBuffersToDraw(
-                                                GrGLGpu* gpu,
-                                                const GrGLVertexBuffer* vbuffer,
-                                                const GrGLIndexBuffer* ibuffer) {
-    SkASSERT(vbuffer);
-    GrGLuint vbufferID = vbuffer->bufferID();
-    GrGLuint* ibufferIDPtr = nullptr;
-    GrGLuint ibufferID;
-    if (ibuffer) {
-        ibufferID = ibuffer->bufferID();
-        ibufferIDPtr = &ibufferID;
-    }
-    return this->internalBind(gpu, vbufferID, ibufferIDPtr);
-}
-
-GrGLAttribArrayState* GrGLGpu::HWGeometryState::bindArrayAndBufferToDraw(GrGLGpu* gpu,
-                                                                         GrGLuint vbufferID) {
-    return this->internalBind(gpu, vbufferID, nullptr);
-}
-
-GrGLAttribArrayState* GrGLGpu::HWGeometryState::bindArrayAndBuffersToDraw(GrGLGpu* gpu,
-                                                                          GrGLuint vbufferID,
-                                                                          GrGLuint ibufferID) {
-    return this->internalBind(gpu, vbufferID, &ibufferID);
-}
-
-GrGLAttribArrayState* GrGLGpu::HWGeometryState::internalBind(GrGLGpu* gpu,
-                                                             GrGLuint vbufferID,
-                                                             GrGLuint* ibufferID) {
-    GrGLAttribArrayState* attribState;
-
-    if (gpu->glCaps().isCoreProfile() && 0 != vbufferID) {
-        if (!fVBOVertexArray) {
-            GrGLuint arrayID;
-            GR_GL_CALL(gpu->glInterface(), GenVertexArrays(1, &arrayID));
-            int attrCount = gpu->glCaps().maxVertexAttributes();
-            fVBOVertexArray = new GrGLVertexArray(arrayID, attrCount);
-        }
-        if (ibufferID) {
-            attribState = fVBOVertexArray->bindWithIndexBuffer(gpu, *ibufferID);
-        } else {
-            attribState = fVBOVertexArray->bind(gpu);
-        }
-    } else {
-        if (ibufferID) {
-            this->setIndexBufferIDOnDefaultVertexArray(gpu, *ibufferID);
-        } else {
-            this->setVertexArrayID(gpu, 0);
-        }
-        int attrCount = gpu->glCaps().maxVertexAttributes();
-        if (fDefaultVertexArrayAttribState.count() != attrCount) {
-            fDefaultVertexArrayAttribState.resize(attrCount);
-        }
-        attribState = &fDefaultVertexArrayAttribState;
-    }
-    return attribState;
-}
+/*
+ * Copyright 2011 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+
+#include "GrGLGpu.h"
+#include "GrGLGLSL.h"
+#include "GrGLStencilAttachment.h"
+#include "GrGLTextureRenderTarget.h"
+#include "GrGpuResourcePriv.h"
+#include "GrPipeline.h"
+#include "GrRenderTargetPriv.h"
+#include "GrSurfacePriv.h"
+#include "GrTexturePriv.h"
+#include "GrTypes.h"
+#include "GrVertices.h"
+#include "builders/GrGLShaderStringBuilder.h"
+#include "glsl/GrGLSL.h"
+#include "glsl/GrGLSLCaps.h"
+#include "SkStrokeRec.h"
+#include "SkTemplates.h"
+
+#define GL_CALL(X) GR_GL_CALL(this->glInterface(), X)
+#define GL_CALL_RET(RET, X) GR_GL_CALL_RET(this->glInterface(), RET, X)
+
+#define SKIP_CACHE_CHECK    true
+
+#if GR_GL_CHECK_ALLOC_WITH_GET_ERROR
+    #define CLEAR_ERROR_BEFORE_ALLOC(iface)   GrGLClearErr(iface)
+    #define GL_ALLOC_CALL(iface, call)        GR_GL_CALL_NOERRCHECK(iface, call)
+    #define CHECK_ALLOC_ERROR(iface)          GR_GL_GET_ERROR(iface)
+#else
+    #define CLEAR_ERROR_BEFORE_ALLOC(iface)
+    #define GL_ALLOC_CALL(iface, call)        GR_GL_CALL(iface, call)
+    #define CHECK_ALLOC_ERROR(iface)          GR_GL_NO_ERROR
+#endif
+
+
+///////////////////////////////////////////////////////////////////////////////
+
+
+static const GrGLenum gXfermodeEquation2Blend[] = {
+    // Basic OpenGL blend equations.
+    GR_GL_FUNC_ADD,
+    GR_GL_FUNC_SUBTRACT,
+    GR_GL_FUNC_REVERSE_SUBTRACT,
+
+    // GL_KHR_blend_equation_advanced.
+    GR_GL_SCREEN,
+    GR_GL_OVERLAY,
+    GR_GL_DARKEN,
+    GR_GL_LIGHTEN,
+    GR_GL_COLORDODGE,
+    GR_GL_COLORBURN,
+    GR_GL_HARDLIGHT,
+    GR_GL_SOFTLIGHT,
+    GR_GL_DIFFERENCE,
+    GR_GL_EXCLUSION,
+    GR_GL_MULTIPLY,
+    GR_GL_HSL_HUE,
+    GR_GL_HSL_SATURATION,
+    GR_GL_HSL_COLOR,
+    GR_GL_HSL_LUMINOSITY
+};
+GR_STATIC_ASSERT(0 == kAdd_GrBlendEquation);
+GR_STATIC_ASSERT(1 == kSubtract_GrBlendEquation);
+GR_STATIC_ASSERT(2 == kReverseSubtract_GrBlendEquation);
+GR_STATIC_ASSERT(3 == kScreen_GrBlendEquation);
+GR_STATIC_ASSERT(4 == kOverlay_GrBlendEquation);
+GR_STATIC_ASSERT(5 == kDarken_GrBlendEquation);
+GR_STATIC_ASSERT(6 == kLighten_GrBlendEquation);
+GR_STATIC_ASSERT(7 == kColorDodge_GrBlendEquation);
+GR_STATIC_ASSERT(8 == kColorBurn_GrBlendEquation);
+GR_STATIC_ASSERT(9 == kHardLight_GrBlendEquation);
+GR_STATIC_ASSERT(10 == kSoftLight_GrBlendEquation);
+GR_STATIC_ASSERT(11 == kDifference_GrBlendEquation);
+GR_STATIC_ASSERT(12 == kExclusion_GrBlendEquation);
+GR_STATIC_ASSERT(13 == kMultiply_GrBlendEquation);
+GR_STATIC_ASSERT(14 == kHSLHue_GrBlendEquation);
+GR_STATIC_ASSERT(15 == kHSLSaturation_GrBlendEquation);
+GR_STATIC_ASSERT(16 == kHSLColor_GrBlendEquation);
+GR_STATIC_ASSERT(17 == kHSLLuminosity_GrBlendEquation);
+GR_STATIC_ASSERT(SK_ARRAY_COUNT(gXfermodeEquation2Blend) == kGrBlendEquationCnt);
+
+static const GrGLenum gXfermodeCoeff2Blend[] = {
+    GR_GL_ZERO,
+    GR_GL_ONE,
+    GR_GL_SRC_COLOR,
+    GR_GL_ONE_MINUS_SRC_COLOR,
+    GR_GL_DST_COLOR,
+    GR_GL_ONE_MINUS_DST_COLOR,
+    GR_GL_SRC_ALPHA,
+    GR_GL_ONE_MINUS_SRC_ALPHA,
+    GR_GL_DST_ALPHA,
+    GR_GL_ONE_MINUS_DST_ALPHA,
+    GR_GL_CONSTANT_COLOR,
+    GR_GL_ONE_MINUS_CONSTANT_COLOR,
+    GR_GL_CONSTANT_ALPHA,
+    GR_GL_ONE_MINUS_CONSTANT_ALPHA,
+
+    // extended blend coeffs
+    GR_GL_SRC1_COLOR,
+    GR_GL_ONE_MINUS_SRC1_COLOR,
+    GR_GL_SRC1_ALPHA,
+    GR_GL_ONE_MINUS_SRC1_ALPHA,
+};
+
+bool GrGLGpu::BlendCoeffReferencesConstant(GrBlendCoeff coeff) {
+    static const bool gCoeffReferencesBlendConst[] = {
+        false,
+        false,
+        false,
+        false,
+        false,
+        false,
+        false,
+        false,
+        false,
+        false,
+        true,
+        true,
+        true,
+        true,
+
+        // extended blend coeffs
+        false,
+        false,
+        false,
+        false,
+    };
+    return gCoeffReferencesBlendConst[coeff];
+    GR_STATIC_ASSERT(kGrBlendCoeffCnt == SK_ARRAY_COUNT(gCoeffReferencesBlendConst));
+
+    GR_STATIC_ASSERT(0 == kZero_GrBlendCoeff);
+    GR_STATIC_ASSERT(1 == kOne_GrBlendCoeff);
+    GR_STATIC_ASSERT(2 == kSC_GrBlendCoeff);
+    GR_STATIC_ASSERT(3 == kISC_GrBlendCoeff);
+    GR_STATIC_ASSERT(4 == kDC_GrBlendCoeff);
+    GR_STATIC_ASSERT(5 == kIDC_GrBlendCoeff);
+    GR_STATIC_ASSERT(6 == kSA_GrBlendCoeff);
+    GR_STATIC_ASSERT(7 == kISA_GrBlendCoeff);
+    GR_STATIC_ASSERT(8 == kDA_GrBlendCoeff);
+    GR_STATIC_ASSERT(9 == kIDA_GrBlendCoeff);
+    GR_STATIC_ASSERT(10 == kConstC_GrBlendCoeff);
+    GR_STATIC_ASSERT(11 == kIConstC_GrBlendCoeff);
+    GR_STATIC_ASSERT(12 == kConstA_GrBlendCoeff);
+    GR_STATIC_ASSERT(13 == kIConstA_GrBlendCoeff);
+
+    GR_STATIC_ASSERT(14 == kS2C_GrBlendCoeff);
+    GR_STATIC_ASSERT(15 == kIS2C_GrBlendCoeff);
+    GR_STATIC_ASSERT(16 == kS2A_GrBlendCoeff);
+    GR_STATIC_ASSERT(17 == kIS2A_GrBlendCoeff);
+
+    // assertion for gXfermodeCoeff2Blend have to be in GrGpu scope
+    GR_STATIC_ASSERT(kGrBlendCoeffCnt == SK_ARRAY_COUNT(gXfermodeCoeff2Blend));
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+
+GrGpu* GrGLGpu::Create(GrBackendContext backendContext, const GrContextOptions& options,
+                       GrContext* context) {
+    SkAutoTUnref<const GrGLInterface> glInterface(
+        reinterpret_cast<const GrGLInterface*>(backendContext));
+    if (!glInterface) {
+        glInterface.reset(GrGLDefaultInterface());
+    } else {
+        glInterface->ref();
+    }
+    if (!glInterface) {
+        return nullptr;
+    }
+    GrGLContext* glContext = GrGLContext::Create(glInterface, options);
+    if (glContext) {
+        return new GrGLGpu(glContext, context);
+    }
+    return nullptr;
+}
+
+static bool gPrintStartupSpew;
+
+GrGLGpu::GrGLGpu(GrGLContext* ctx, GrContext* context)
+    : GrGpu(context)
+    , fGLContext(ctx) {
+    SkASSERT(ctx);
+    fCaps.reset(SkRef(ctx->caps()));
+
+    fHWBoundTextureUniqueIDs.reset(this->glCaps().maxFragmentTextureUnits());
+
+    GrGLClearErr(this->glInterface());
+    if (gPrintStartupSpew) {
+        const GrGLubyte* vendor;
+        const GrGLubyte* renderer;
+        const GrGLubyte* version;
+        GL_CALL_RET(vendor, GetString(GR_GL_VENDOR));
+        GL_CALL_RET(renderer, GetString(GR_GL_RENDERER));
+        GL_CALL_RET(version, GetString(GR_GL_VERSION));
+        SkDebugf("------------------------- create GrGLGpu %p --------------\n",
+                 this);
+        SkDebugf("------ VENDOR %s\n", vendor);
+        SkDebugf("------ RENDERER %s\n", renderer);
+        SkDebugf("------ VERSION %s\n",  version);
+        SkDebugf("------ EXTENSIONS\n");
+        this->glContext().extensions().print();
+        SkDebugf("\n");
+        SkDebugf("%s", this->glCaps().dump().c_str());
+    }
+
+    fProgramCache = new ProgramCache(this);
+
+    SkASSERT(this->glCaps().maxVertexAttributes() >= GrGeometryProcessor::kMaxVertexAttribs);
+
+    fHWProgramID = 0;
+    fTempSrcFBOID = 0;
+    fTempDstFBOID = 0;
+    fStencilClearFBOID = 0;
+
+    if (this->glCaps().shaderCaps()->pathRenderingSupport()) {
+        fPathRendering.reset(new GrGLPathRendering(this));
+    }
+    this->createCopyPrograms();
+    fWireRectProgram.fProgram = 0;
+    fWireRectArrayBuffer = 0;
+}
+
+GrGLGpu::~GrGLGpu() {
+    if (0 != fHWProgramID) {
+        // detach the current program so there is no confusion on OpenGL's part
+        // that we want it to be deleted
+        GL_CALL(UseProgram(0));
+    }
+
+    if (0 != fTempSrcFBOID) {
+        GL_CALL(DeleteFramebuffers(1, &fTempSrcFBOID));
+    }
+    if (0 != fTempDstFBOID) {
+        GL_CALL(DeleteFramebuffers(1, &fTempDstFBOID));
+    }
+    if (0 != fStencilClearFBOID) {
+        GL_CALL(DeleteFramebuffers(1, &fStencilClearFBOID));
+    }
+
+    for (size_t i = 0; i < SK_ARRAY_COUNT(fCopyPrograms); ++i) {
+        if (0 != fCopyPrograms[i].fProgram) {
+            GL_CALL(DeleteProgram(fCopyPrograms[i].fProgram));
+        }
+    }
+
+    if (0 != fCopyProgramArrayBuffer) {
+        GL_CALL(DeleteBuffers(1, &fCopyProgramArrayBuffer));
+    }
+
+    if (0 != fWireRectProgram.fProgram) {
+        GL_CALL(DeleteProgram(fWireRectProgram.fProgram));
+    }
+
+    if (0 != fWireRectArrayBuffer) {
+        GL_CALL(DeleteBuffers(1, &fWireRectArrayBuffer));
+    }
+
+    delete fProgramCache;
+}
+
+void GrGLGpu::contextAbandoned() {
+    INHERITED::contextAbandoned();
+    fProgramCache->abandon();
+    fHWProgramID = 0;
+    fTempSrcFBOID = 0;
+    fTempDstFBOID = 0;
+    fStencilClearFBOID = 0;
+    fCopyProgramArrayBuffer = 0;
+    for (size_t i = 0; i < SK_ARRAY_COUNT(fCopyPrograms); ++i) {
+        fCopyPrograms[i].fProgram = 0;
+    }
+    fWireRectProgram.fProgram = 0;
+    fWireRectArrayBuffer = 0;
+    if (this->glCaps().shaderCaps()->pathRenderingSupport()) {
+        this->glPathRendering()->abandonGpuResources();
+    }
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+void GrGLGpu::onResetContext(uint32_t resetBits) {
+    // we don't use the zb at all
+    if (resetBits & kMisc_GrGLBackendState) {
+        GL_CALL(Disable(GR_GL_DEPTH_TEST));
+        GL_CALL(DepthMask(GR_GL_FALSE));
+
+        fHWDrawFace = GrPipelineBuilder::kInvalid_DrawFace;
+
+        if (kGL_GrGLStandard == this->glStandard()) {
+            // Desktop-only state that we never change
+            if (!this->glCaps().isCoreProfile()) {
+                GL_CALL(Disable(GR_GL_POINT_SMOOTH));
+                GL_CALL(Disable(GR_GL_LINE_SMOOTH));
+                GL_CALL(Disable(GR_GL_POLYGON_SMOOTH));
+                GL_CALL(Disable(GR_GL_POLYGON_STIPPLE));
+                GL_CALL(Disable(GR_GL_COLOR_LOGIC_OP));
+                GL_CALL(Disable(GR_GL_INDEX_LOGIC_OP));
+            }
+            // The windows NVIDIA driver has GL_ARB_imaging in the extension string when using a
+            // core profile. This seems like a bug since the core spec removes any mention of
+            // GL_ARB_imaging.
+            if (this->glCaps().imagingSupport() && !this->glCaps().isCoreProfile()) {
+                GL_CALL(Disable(GR_GL_COLOR_TABLE));
+            }
+            GL_CALL(Disable(GR_GL_POLYGON_OFFSET_FILL));
+            // Since ES doesn't support glPointSize at all we always use the VS to
+            // set the point size
+            GL_CALL(Enable(GR_GL_VERTEX_PROGRAM_POINT_SIZE));
+
+            // We should set glPolygonMode(FRONT_AND_BACK,FILL) here, too. It isn't
+            // currently part of our gl interface. There are probably others as
+            // well.
+        }
+
+        if (kGLES_GrGLStandard == this->glStandard() &&
+                this->hasExtension("GL_ARM_shader_framebuffer_fetch")) {
+            // The arm extension requires specifically enabling MSAA fetching per sample.
+            // On some devices this may have a perf hit.  Also multiple render targets are disabled
+            GL_CALL(Enable(GR_GL_FETCH_PER_SAMPLE_ARM));
+        }
+        fHWWriteToColor = kUnknown_TriState;
+        // we only ever use lines in hairline mode
+        GL_CALL(LineWidth(1));
+        GL_CALL(Disable(GR_GL_DITHER));
+    }
+
+    if (resetBits & kMSAAEnable_GrGLBackendState) {
+        fMSAAEnabled = kUnknown_TriState;
+
+        // In mixed samples mode coverage modulation allows the coverage to be converted to
+        // "opacity", which can then be blended into the color buffer to accomplish antialiasing.
+        // Enable coverage modulation suitable for premultiplied alpha colors.
+        // This state has no effect when not rendering to a mixed sampled target.
+        if (this->caps()->mixedSamplesSupport()) {
+            GL_CALL(CoverageModulation(GR_GL_RGBA));
+        }
+    }
+
+    fHWActiveTextureUnitIdx = -1; // invalid
+
+    if (resetBits & kTextureBinding_GrGLBackendState) {
+        for (int s = 0; s < fHWBoundTextureUniqueIDs.count(); ++s) {
+            fHWBoundTextureUniqueIDs[s] = SK_InvalidUniqueID;
+        }
+    }
+
+    if (resetBits & kBlend_GrGLBackendState) {
+        fHWBlendState.invalidate();
+    }
+
+    if (resetBits & kView_GrGLBackendState) {
+        fHWScissorSettings.invalidate();
+        fHWViewport.invalidate();
+    }
+
+    if (resetBits & kStencil_GrGLBackendState) {
+        fHWStencilSettings.invalidate();
+        fHWStencilTestEnabled = kUnknown_TriState;
+    }
+
+    // Vertex
+    if (resetBits & kVertex_GrGLBackendState) {
+        fHWGeometryState.invalidate();
+    }
+
+    if (resetBits & kRenderTarget_GrGLBackendState) {
+        fHWBoundRenderTargetUniqueID = SK_InvalidUniqueID;
+        fHWSRGBFramebuffer = kUnknown_TriState;
+    }
+
+    if (resetBits & kPathRendering_GrGLBackendState) {
+        if (this->caps()->shaderCaps()->pathRenderingSupport()) {
+            this->glPathRendering()->resetContext();
+        }
+    }
+
+    // we assume these values
+    if (resetBits & kPixelStore_GrGLBackendState) {
+        if (this->glCaps().unpackRowLengthSupport()) {
+            GL_CALL(PixelStorei(GR_GL_UNPACK_ROW_LENGTH, 0));
+        }
+        if (this->glCaps().packRowLengthSupport()) {
+            GL_CALL(PixelStorei(GR_GL_PACK_ROW_LENGTH, 0));
+        }
+        if (this->glCaps().unpackFlipYSupport()) {
+            GL_CALL(PixelStorei(GR_GL_UNPACK_FLIP_Y, GR_GL_FALSE));
+        }
+        if (this->glCaps().packFlipYSupport()) {
+            GL_CALL(PixelStorei(GR_GL_PACK_REVERSE_ROW_ORDER, GR_GL_FALSE));
+        }
+    }
+
+    if (resetBits & kProgram_GrGLBackendState) {
+        fHWProgramID = 0;
+    }
+}
+
+static GrSurfaceOrigin resolve_origin(GrSurfaceOrigin origin, bool renderTarget) {
+    // By default, GrRenderTargets are GL's normal orientation so that they
+    // can be drawn to by the outside world without the client having
+    // to render upside down.
+    if (kDefault_GrSurfaceOrigin == origin) {
+        return renderTarget ? kBottomLeft_GrSurfaceOrigin : kTopLeft_GrSurfaceOrigin;
+    } else {
+        return origin;
+    }
+}
+
+GrTexture* GrGLGpu::onWrapBackendTexture(const GrBackendTextureDesc& desc,
+                                         GrWrapOwnership ownership) {
+#ifdef SK_IGNORE_GL_TEXTURE_TARGET
+    if (!desc.fTextureHandle) {
+        return nullptr;
+    }
+#else
+    const GrGLTextureInfo* info = reinterpret_cast<const GrGLTextureInfo*>(desc.fTextureHandle);
+    if (!info || !info->fID) {
+        return nullptr;
+    }
+#endif
+
+    int maxSize = this->caps()->maxTextureSize();
+    if (desc.fWidth > maxSize || desc.fHeight > maxSize) {
+        return nullptr;
+    }
+
+    // next line relies on GrBackendTextureDesc's flags matching GrTexture's
+    bool renderTarget = SkToBool(desc.fFlags & kRenderTarget_GrBackendTextureFlag);
+
+    GrGLTexture::IDDesc idDesc;
+    GrSurfaceDesc surfDesc;
+
+#ifdef SK_IGNORE_GL_TEXTURE_TARGET
+    idDesc.fInfo.fID = static_cast<GrGLuint>(desc.fTextureHandle);
+    // We only support GL_TEXTURE_2D at the moment.
+    idDesc.fInfo.fTarget = GR_GL_TEXTURE_2D;
+#else
+    idDesc.fInfo = *info;
+#endif
+    if (GR_GL_TEXTURE_EXTERNAL == idDesc.fInfo.fTarget) {
+        if (renderTarget) {
+            // This combination is not supported.
+            return nullptr;
+        }
+        if (!this->glCaps().externalTextureSupport()) {
+            return nullptr;
+        }
+    }
+    // Sample count is interpretted to mean the number of samples that Gr code should allocate
+    // for a render buffer that resolves to the texture. We don't support MSAA textures.
+    if (desc.fSampleCnt && !renderTarget) {
+        return nullptr;
+    }
+
+    switch (ownership) {
+        case kAdopt_GrWrapOwnership:
+            idDesc.fLifeCycle = GrGpuResource::kAdopted_LifeCycle;
+            break;
+        case kBorrow_GrWrapOwnership:
+            idDesc.fLifeCycle = GrGpuResource::kBorrowed_LifeCycle;
+            break;
+    }    
+
+    surfDesc.fFlags = (GrSurfaceFlags) desc.fFlags;
+    surfDesc.fWidth = desc.fWidth;
+    surfDesc.fHeight = desc.fHeight;
+    surfDesc.fConfig = desc.fConfig;
+    surfDesc.fSampleCnt = SkTMin(desc.fSampleCnt, this->caps()->maxSampleCount());
+    // FIXME:  this should be calling resolve_origin(), but Chrome code is currently
+    // assuming the old behaviour, which is that backend textures are always
+    // BottomLeft, even for non-RT's.  Once Chrome is fixed, change this to:
+    // glTexDesc.fOrigin = resolve_origin(desc.fOrigin, renderTarget);
+    if (kDefault_GrSurfaceOrigin == desc.fOrigin) {
+        surfDesc.fOrigin = kBottomLeft_GrSurfaceOrigin;
+    } else {
+        surfDesc.fOrigin = desc.fOrigin;
+    }
+
+    GrGLTexture* texture = nullptr;
+    if (renderTarget) {
+        GrGLRenderTarget::IDDesc rtIDDesc;
+        if (!this->createRenderTargetObjects(surfDesc, GrGpuResource::kUncached_LifeCycle,
+                                             idDesc.fInfo, &rtIDDesc)) {
+            return nullptr;
+        }
+        texture = new GrGLTextureRenderTarget(this, surfDesc, idDesc, rtIDDesc);
+    } else {
+        texture = new GrGLTexture(this, surfDesc, idDesc);
+    }
+    if (nullptr == texture) {
+        return nullptr;
+    }
+
+    return texture;
+}
+
+GrRenderTarget* GrGLGpu::onWrapBackendRenderTarget(const GrBackendRenderTargetDesc& wrapDesc,
+                                                   GrWrapOwnership ownership) {
+    GrGLRenderTarget::IDDesc idDesc;
+    idDesc.fRTFBOID = static_cast<GrGLuint>(wrapDesc.fRenderTargetHandle);
+    idDesc.fMSColorRenderbufferID = 0;
+    idDesc.fTexFBOID = GrGLRenderTarget::kUnresolvableFBOID;
+    switch (ownership) {
+        case kAdopt_GrWrapOwnership:
+            idDesc.fLifeCycle = GrGpuResource::kAdopted_LifeCycle;
+            break;
+        case kBorrow_GrWrapOwnership:
+            idDesc.fLifeCycle = GrGpuResource::kBorrowed_LifeCycle;
+            break;
+    }    
+    idDesc.fSampleConfig = GrRenderTarget::kUnified_SampleConfig;
+
+    GrSurfaceDesc desc;
+    desc.fConfig = wrapDesc.fConfig;
+    desc.fFlags = kCheckAllocation_GrSurfaceFlag | kRenderTarget_GrSurfaceFlag;
+    desc.fWidth = wrapDesc.fWidth;
+    desc.fHeight = wrapDesc.fHeight;
+    desc.fSampleCnt = SkTMin(wrapDesc.fSampleCnt, this->caps()->maxSampleCount());
+    desc.fOrigin = resolve_origin(wrapDesc.fOrigin, true);
+
+    return GrGLRenderTarget::CreateWrapped(this, desc, idDesc, wrapDesc.fStencilBits);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+bool GrGLGpu::onGetWritePixelsInfo(GrSurface* dstSurface, int width, int height,
+                                   size_t rowBytes, GrPixelConfig srcConfig,
+                                   DrawPreference* drawPreference,
+                                   WritePixelTempDrawInfo* tempDrawInfo) {
+    if (kIndex_8_GrPixelConfig == srcConfig || GrPixelConfigIsCompressed(dstSurface->config())) {
+        return false;
+    }
+
+    // This subclass only allows writes to textures. If the dst is not a texture we have to draw
+    // into it. We could use glDrawPixels on GLs that have it, but we don't today.
+    if (!dstSurface->asTexture()) {
+        ElevateDrawPreference(drawPreference, kRequireDraw_DrawPreference);
+    } else {
+        GrGLTexture* texture = static_cast<GrGLTexture*>(dstSurface->asTexture());
+        if (GR_GL_TEXTURE_2D != texture->target()) {
+             // We don't currently support writing pixels to non-TEXTURE_2D textures.
+             return false;
+        }
+    }
+
+    if (GrPixelConfigIsSRGB(dstSurface->config()) != GrPixelConfigIsSRGB(srcConfig)) {
+        ElevateDrawPreference(drawPreference, kRequireDraw_DrawPreference);
+    }
+
+    tempDrawInfo->fSwapRAndB = false;
+
+    // These settings we will always want if a temp draw is performed. Initially set the config
+    // to srcConfig, though that may be modified if we decide to do a R/G swap.
+    tempDrawInfo->fTempSurfaceDesc.fFlags = kNone_GrSurfaceFlags;
+    tempDrawInfo->fTempSurfaceDesc.fConfig = srcConfig;
+    tempDrawInfo->fTempSurfaceDesc.fWidth = width;
+    tempDrawInfo->fTempSurfaceDesc.fHeight = height;
+    tempDrawInfo->fTempSurfaceDesc.fSampleCnt = 0;
+    tempDrawInfo->fTempSurfaceDesc.fOrigin = kTopLeft_GrSurfaceOrigin; // no CPU y-flip for TL.
+
+    bool configsAreRBSwaps = GrPixelConfigSwapRAndB(srcConfig) == dstSurface->config();
+
+    if (configsAreRBSwaps) {
+        if (!this->caps()->isConfigTexturable(srcConfig)) {
+            ElevateDrawPreference(drawPreference, kRequireDraw_DrawPreference);
+            tempDrawInfo->fTempSurfaceDesc.fConfig = dstSurface->config();
+            tempDrawInfo->fSwapRAndB = true;
+        } else if (this->glCaps().rgba8888PixelsOpsAreSlow() &&
+                   kRGBA_8888_GrPixelConfig == srcConfig) {
+            ElevateDrawPreference(drawPreference, kGpuPrefersDraw_DrawPreference);
+            tempDrawInfo->fTempSurfaceDesc.fConfig = dstSurface->config();
+            tempDrawInfo->fSwapRAndB = true;
+        } else if (kGLES_GrGLStandard == this->glStandard() &&
+                   this->glCaps().bgraIsInternalFormat()) {
+            // The internal format and external formats must match texture uploads so we can't
+            // swizzle while uploading when BGRA is a distinct internal format.
+            ElevateDrawPreference(drawPreference, kRequireDraw_DrawPreference);
+            tempDrawInfo->fTempSurfaceDesc.fConfig = dstSurface->config();
+            tempDrawInfo->fSwapRAndB = true;
+        }
+    }
+
+    if (!this->glCaps().unpackFlipYSupport() &&
+        kBottomLeft_GrSurfaceOrigin == dstSurface->origin()) {
+        ElevateDrawPreference(drawPreference, kGpuPrefersDraw_DrawPreference);
+    }
+
+    return true;
+}
+
+bool GrGLGpu::onWritePixels(GrSurface* surface,
+                            int left, int top, int width, int height,
+                            GrPixelConfig config, const void* buffer,
+                            size_t rowBytes) {
+    GrGLTexture* glTex = static_cast<GrGLTexture*>(surface->asTexture());
+    if (!glTex) {
+        return false;
+    }
+
+    // OpenGL doesn't do sRGB <-> linear conversions when reading and writing pixels.
+    if (GrPixelConfigIsSRGB(surface->config()) != GrPixelConfigIsSRGB(config)) {
+        return false;
+    }
+
+    // Write pixels is only implemented for TEXTURE_2D textures
+    if (GR_GL_TEXTURE_2D != glTex->target()) {
+        return false;
+    }
+
+    this->setScratchTextureUnit();
+    GL_CALL(BindTexture(glTex->target(), glTex->textureID()));
+
+    bool success = false;
+    if (GrPixelConfigIsCompressed(glTex->desc().fConfig)) {
+        // We check that config == desc.fConfig in GrGLGpu::canWriteTexturePixels()
+        SkASSERT(config == glTex->desc().fConfig);
+        success = this->uploadCompressedTexData(glTex->desc(), glTex->target(), buffer, 
+                                                kDefault_UploadType, left, top, width, height);
+    } else {
+        success = this->uploadTexData(glTex->desc(), glTex->target(), kDefault_UploadType, 
+                                      left, top, width, height, config, buffer, rowBytes);
+    }
+
+    if (success) {
+        glTex->texturePriv().dirtyMipMaps(true);
+        return true;
+    }
+
+    return false;
+}
+
+bool GrGLGpu::onTransferPixels(GrSurface* surface,
+                               int left, int top, int width, int height,
+                               GrPixelConfig config, GrTransferBuffer* buffer,
+                               size_t offset, size_t rowBytes) {
+    GrGLTexture* glTex = static_cast<GrGLTexture*>(surface->asTexture());
+    if (!glTex) {

[bsalomon, 2016/01/05 14:01:17]

If there is a simple way to share this preamble of checks with onUploadPixels
that'd be nice.

[jvanverth1, 2016/01/05 17:21:28]

Done.

+        return false;
+    }
+
+    // OpenGL doesn't do sRGB <-> linear conversions when reading and writing pixels.
+    if (GrPixelConfigIsSRGB(surface->config()) != GrPixelConfigIsSRGB(config)) {
+        return false;
+    }
+
+    // Transfer pixels is only implemented for TEXTURE_2D textures
+    if (GR_GL_TEXTURE_2D != glTex->target()) {
+        return false;
+    }
+
+    // For the moment, can't transfer compressed data
+    if (GrPixelConfigIsCompressed(glTex->desc().fConfig)) {
+        return false;
+    }
+
+    this->setScratchTextureUnit();
+    GL_CALL(BindTexture(glTex->target(), glTex->textureID()));
+
+    SkASSERT(!buffer->isMapped());
+    GrGLTransferBuffer* glBuffer = reinterpret_cast<GrGLTransferBuffer*>(buffer);
+    // bind the transfer buffer
+    SkASSERT(GR_GL_PIXEL_UNPACK_BUFFER == glBuffer->bufferType() ||
+             GR_GL_PIXEL_UNPACK_TRANSFER_BUFFER_CHROMIUM == glBuffer->bufferType());
+    GL_CALL(BindBuffer(glBuffer->bufferType(), glBuffer->bufferID()));
+
+    bool success = false;
+    success = this->uploadTexData(glTex->desc(), glTex->target(), kTransfer_UploadType,
+                                  left, top, width, height, config, buffer, rowBytes);
+
+    if (success) {
+        glTex->texturePriv().dirtyMipMaps(true);
+        return true;
+    }
+
+    return false;
+}
+
+// For GL_[UN]PACK_ALIGNMENT.
+static inline GrGLint config_alignment(GrPixelConfig config) {
+    SkASSERT(!GrPixelConfigIsCompressed(config));
+    switch (config) {
+        case kAlpha_8_GrPixelConfig:
+            return 1;
+        case kRGB_565_GrPixelConfig:
+        case kRGBA_4444_GrPixelConfig:
+        case kAlpha_half_GrPixelConfig:
+        case kRGBA_half_GrPixelConfig:
+            return 2;
+        case kRGBA_8888_GrPixelConfig:
+        case kBGRA_8888_GrPixelConfig:
+        case kSRGBA_8888_GrPixelConfig:
+        case kRGBA_float_GrPixelConfig:
+            return 4;
+        default:
+            return 0;
+    }
+}
+
+static inline GrGLenum check_alloc_error(const GrSurfaceDesc& desc,
+                                         const GrGLInterface* interface) {
+    if (SkToBool(desc.fFlags & kCheckAllocation_GrSurfaceFlag)) {
+        return GR_GL_GET_ERROR(interface);
+    } else {
+        return CHECK_ALLOC_ERROR(interface);
+    }
+}
+
+bool GrGLGpu::uploadTexData(const GrSurfaceDesc& desc,
+                            GrGLenum target,
+                            UploadType uploadType,
+                            int left, int top, int width, int height,
+                            GrPixelConfig dataConfig,
+                            const void* dataOrOffset,
+                            size_t rowBytes) {
+    SkASSERT(dataOrOffset || kNewTexture_UploadType == uploadType || 
+             kTransfer_UploadType == uploadType);
+
+    // If we're uploading compressed data then we should be using uploadCompressedTexData
+    SkASSERT(!GrPixelConfigIsCompressed(dataConfig));
+
+    SkASSERT(this->caps()->isConfigTexturable(desc.fConfig));
+
+    size_t bpp = GrBytesPerPixel(dataConfig);
+    if (!GrSurfacePriv::AdjustWritePixelParams(desc.fWidth, desc.fHeight, bpp, &left, &top,
+                                               &width, &height, &dataOrOffset, &rowBytes)) {
+        return false;
+    }
+    size_t trimRowBytes = width * bpp;
+
+    // in case we need a temporary, trimmed copy of the src pixels
+#if defined(GOOGLE3)
+    // Stack frame size is limited in GOOGLE3.
+    SkAutoSMalloc<64 * 128> tempStorage;
+#else
+    SkAutoSMalloc<128 * 128> tempStorage;
+#endif
+
+    // Internal format comes from the texture desc.
+    GrGLenum internalFormat =
+        this->glCaps().configGLFormats(desc.fConfig).fInternalFormatTexImage;
+
+    // External format and type come from the upload data.
+    GrGLenum externalFormat =
+        this->glCaps().configGLFormats(dataConfig).fExternalFormatForTexImage;
+    GrGLenum externalType = this->glCaps().configGLFormats(dataConfig).fExternalType;
+
+    /*
+     *  Check whether to allocate a temporary buffer for flipping y or
+     *  because our srcData has extra bytes past each row. If so, we need
+     *  to trim those off here, since GL ES may not let us specify
+     *  GL_UNPACK_ROW_LENGTH.
+     */
+    bool restoreGLRowLength = false;
+    bool swFlipY = false;
+    bool glFlipY = false;
+    if (dataOrOffset) {
+        if (kBottomLeft_GrSurfaceOrigin == desc.fOrigin) {
+            if (this->glCaps().unpackFlipYSupport()) {
+                glFlipY = true;
+            } else {
+                swFlipY = true;
+            }
+        }
+        if (this->glCaps().unpackRowLengthSupport() && !swFlipY) {
+            // can't use this for flipping, only non-neg values allowed. :(
+            if (rowBytes != trimRowBytes) {
+                GrGLint rowLength = static_cast<GrGLint>(rowBytes / bpp);
+                GL_CALL(PixelStorei(GR_GL_UNPACK_ROW_LENGTH, rowLength));
+                restoreGLRowLength = true;
+            }
+        } else if (kTransfer_UploadType != uploadType) {
+            if (trimRowBytes != rowBytes || swFlipY) {
+                // copy data into our new storage, skipping the trailing bytes
+                size_t trimSize = height * trimRowBytes;
+                const char* src = (const char*)dataOrOffset;
+                if (swFlipY) {
+                    src += (height - 1) * rowBytes;
+                }
+                char* dst = (char*)tempStorage.reset(trimSize);
+                for (int y = 0; y < height; y++) {
+                    memcpy(dst, src, trimRowBytes);
+                    if (swFlipY) {
+                        src -= rowBytes;
+                    } else {
+                        src += rowBytes;
+                    }
+                    dst += trimRowBytes;
+                }
+                // now point data to our copied version
+                dataOrOffset = tempStorage.get();
+            }
+        } else {
+            return false;
+        }
+        if (glFlipY) {
+            GL_CALL(PixelStorei(GR_GL_UNPACK_FLIP_Y, GR_GL_TRUE));
+        }
+        GL_CALL(PixelStorei(GR_GL_UNPACK_ALIGNMENT, config_alignment(dataConfig)));
+    }
+    bool succeeded = true;
+    if (kNewTexture_UploadType == uploadType) {
+        if (dataOrOffset && 
+            !(0 == left && 0 == top && desc.fWidth == width && desc.fHeight == height)) {
+            succeeded = false;
+        } else {
+            CLEAR_ERROR_BEFORE_ALLOC(this->glInterface());
+            GL_ALLOC_CALL(this->glInterface(), TexImage2D(target, 0, internalFormat, desc.fWidth,
+                                                          desc.fHeight, 0,  externalFormat,
+                                                          externalType, dataOrOffset));
+            GrGLenum error = check_alloc_error(desc, this->glInterface());
+            if (error != GR_GL_NO_ERROR) {
+                succeeded = false;
+            }
+        }
+    } else {
+        if (swFlipY || glFlipY) {
+            top = desc.fHeight - (top + height);
+        }
+        GL_CALL(TexSubImage2D(target,
+                              0, // level
+                              left, top,
+                              width, height,
+                              externalFormat, externalType, dataOrOffset));
+    }
+
+    if (restoreGLRowLength) {
+        SkASSERT(this->glCaps().unpackRowLengthSupport());
+        GL_CALL(PixelStorei(GR_GL_UNPACK_ROW_LENGTH, 0));
+    }
+    if (glFlipY) {
+        GL_CALL(PixelStorei(GR_GL_UNPACK_FLIP_Y, GR_GL_FALSE));
+    }
+    return succeeded;
+}
+
+// TODO: This function is using a lot of wonky semantics like, if width == -1
+// then set width = desc.fWdith ... blah. A better way to do it might be to
+// create a CompressedTexData struct that takes a desc/ptr and figures out
+// the proper upload semantics. Then users can construct this function how they
+// see fit if they want to go against the "standard" way to do it.
+bool GrGLGpu::uploadCompressedTexData(const GrSurfaceDesc& desc,
+                                      GrGLenum target,
+                                      const void* data,
+                                      UploadType uploadType,
+                                      int left, int top, int width, int height) {
+    SkASSERT(this->caps()->isConfigTexturable(desc.fConfig));
+    SkASSERT(kTransfer_UploadType != uploadType && 
+             (data || kNewTexture_UploadType != uploadType));
+
+    // No support for software flip y, yet...
+    SkASSERT(kBottomLeft_GrSurfaceOrigin != desc.fOrigin);
+
+    if (-1 == width) {
+        width = desc.fWidth;
+    }
+#ifdef SK_DEBUG
+    else {
+        SkASSERT(width <= desc.fWidth);
+    }
+#endif
+
+    if (-1 == height) {
+        height = desc.fHeight;
+    }
+#ifdef SK_DEBUG
+    else {
+        SkASSERT(height <= desc.fHeight);
+    }
+#endif
+
+    // Make sure that the width and height that we pass to OpenGL
+    // is a multiple of the block size.
+    size_t dataSize = GrCompressedFormatDataSize(desc.fConfig, width, height);
+
+    // We only need the internal format for compressed 2D textures. There is on
+    // sized vs base internal format distinction for compressed textures.
+    GrGLenum internalFormat =this->glCaps().configGLFormats(desc.fConfig).fSizedInternalFormat;
+
+    if (kNewTexture_UploadType == uploadType) {
+        CLEAR_ERROR_BEFORE_ALLOC(this->glInterface());
+        GL_ALLOC_CALL(this->glInterface(),
+                      CompressedTexImage2D(target,
+                                           0, // level
+                                           internalFormat,
+                                           width, height,
+                                           0, // border
+                                           SkToInt(dataSize),
+                                           data));
+        GrGLenum error = check_alloc_error(desc, this->glInterface());
+        if (error != GR_GL_NO_ERROR) {
+            return false;
+        }
+    } else {
+        // Paletted textures can't be updated.
+        if (GR_GL_PALETTE8_RGBA8 == internalFormat) {
+            return false;
+        }
+        GL_CALL(CompressedTexSubImage2D(target,
+                                        0, // level
+                                        left, top,
+                                        width, height,
+                                        internalFormat,
+                                        SkToInt(dataSize),
+                                        data));
+    }
+
+    return true;
+}
+
+static bool renderbuffer_storage_msaa(const GrGLContext& ctx,
+                                      int sampleCount,
+                                      GrGLenum format,
+                                      int width, int height) {
+    CLEAR_ERROR_BEFORE_ALLOC(ctx.interface());
+    SkASSERT(GrGLCaps::kNone_MSFBOType != ctx.caps()->msFBOType());
+    switch (ctx.caps()->msFBOType()) {
+        case GrGLCaps::kDesktop_ARB_MSFBOType:
+        case GrGLCaps::kDesktop_EXT_MSFBOType:
+        case GrGLCaps::kMixedSamples_MSFBOType:
+        case GrGLCaps::kES_3_0_MSFBOType:
+            GL_ALLOC_CALL(ctx.interface(),
+                            RenderbufferStorageMultisample(GR_GL_RENDERBUFFER,
+                                                            sampleCount,
+                                                            format,
+                                                            width, height));
+            break;
+        case GrGLCaps::kES_Apple_MSFBOType:
+            GL_ALLOC_CALL(ctx.interface(),
+                            RenderbufferStorageMultisampleES2APPLE(GR_GL_RENDERBUFFER,
+                                                                    sampleCount,
+                                                                    format,
+                                                                    width, height));
+            break;
+        case GrGLCaps::kES_EXT_MsToTexture_MSFBOType:
+        case GrGLCaps::kES_IMG_MsToTexture_MSFBOType:
+            GL_ALLOC_CALL(ctx.interface(),
+                            RenderbufferStorageMultisampleES2EXT(GR_GL_RENDERBUFFER,
+                                                                sampleCount,
+                                                                format,
+                                                                width, height));
+            break;
+        case GrGLCaps::kNone_MSFBOType:
+            SkFAIL("Shouldn't be here if we don't support multisampled renderbuffers.");
+            break;
+    }
+    return (GR_GL_NO_ERROR == CHECK_ALLOC_ERROR(ctx.interface()));
+}
+
+bool GrGLGpu::createRenderTargetObjects(const GrSurfaceDesc& desc,
+                                        GrGpuResource::LifeCycle lifeCycle,
+                                        const GrGLTextureInfo& texInfo,
+                                        GrGLRenderTarget::IDDesc* idDesc) {
+    idDesc->fMSColorRenderbufferID = 0;
+    idDesc->fRTFBOID = 0;
+    idDesc->fTexFBOID = 0;
+    idDesc->fLifeCycle = lifeCycle;
+    idDesc->fSampleConfig = (GrGLCaps::kMixedSamples_MSFBOType == this->glCaps().msFBOType() &&
+                            desc.fSampleCnt > 0) ? GrRenderTarget::kStencil_SampleConfig :
+                                                   GrRenderTarget::kUnified_SampleConfig;
+
+    GrGLenum status;
+
+    GrGLenum colorRenderbufferFormat = 0; // suppress warning
+
+    if (desc.fSampleCnt > 0 && GrGLCaps::kNone_MSFBOType == this->glCaps().msFBOType()) {
+        goto FAILED;
+    }
+
+    GL_CALL(GenFramebuffers(1, &idDesc->fTexFBOID));
+    if (!idDesc->fTexFBOID) {
+        goto FAILED;
+    }
+
+    // If we are using multisampling we will create two FBOS. We render to one and then resolve to
+    // the texture bound to the other. The exception is the IMG multisample extension. With this
+    // extension the texture is multisampled when rendered to and then auto-resolves it when it is
+    // rendered from.
+    if (desc.fSampleCnt > 0 && this->glCaps().usesMSAARenderBuffers()) {
+        GL_CALL(GenFramebuffers(1, &idDesc->fRTFBOID));
+        GL_CALL(GenRenderbuffers(1, &idDesc->fMSColorRenderbufferID));
+        if (!idDesc->fRTFBOID ||
+            !idDesc->fMSColorRenderbufferID) {
+            goto FAILED;
+        }
+        // All ES versions (thus far) require sized internal formats for render buffers.
+        // TODO: Always use sized internal format?
+        // If this rule gets more complicated, add a field to ConfigEntry rather than logic here.
+        colorRenderbufferFormat = kGLES_GrGLStandard == this->glStandard() ?
+                            this->glCaps().configGLFormats(desc.fConfig).fSizedInternalFormat :
+                            this->glCaps().configGLFormats(desc.fConfig).fBaseInternalFormat;
+    } else {
+        idDesc->fRTFBOID = idDesc->fTexFBOID;
+    }
+
+    // below here we may bind the FBO
+    fHWBoundRenderTargetUniqueID = SK_InvalidUniqueID;
+    if (idDesc->fRTFBOID != idDesc->fTexFBOID) {
+        SkASSERT(desc.fSampleCnt > 0);
+        GL_CALL(BindRenderbuffer(GR_GL_RENDERBUFFER, idDesc->fMSColorRenderbufferID));
+        if (!renderbuffer_storage_msaa(*fGLContext,
+                                       desc.fSampleCnt,
+                                       colorRenderbufferFormat,
+                                       desc.fWidth, desc.fHeight)) {
+            goto FAILED;
+        }
+        fStats.incRenderTargetBinds();
+        GL_CALL(BindFramebuffer(GR_GL_FRAMEBUFFER, idDesc->fRTFBOID));
+        GL_CALL(FramebufferRenderbuffer(GR_GL_FRAMEBUFFER,
+                                        GR_GL_COLOR_ATTACHMENT0,
+                                        GR_GL_RENDERBUFFER,
+                                        idDesc->fMSColorRenderbufferID));
+        if ((desc.fFlags & kCheckAllocation_GrSurfaceFlag) ||
+            !this->glCaps().isConfigVerifiedColorAttachment(desc.fConfig)) {
+            GL_CALL_RET(status, CheckFramebufferStatus(GR_GL_FRAMEBUFFER));
+            if (status != GR_GL_FRAMEBUFFER_COMPLETE) {
+                goto FAILED;
+            }
+            fGLContext->caps()->markConfigAsValidColorAttachment(desc.fConfig);
+        }
+    }
+    fStats.incRenderTargetBinds();
+    GL_CALL(BindFramebuffer(GR_GL_FRAMEBUFFER, idDesc->fTexFBOID));
+
+    if (this->glCaps().usesImplicitMSAAResolve() && desc.fSampleCnt > 0) {
+        GL_CALL(FramebufferTexture2DMultisample(GR_GL_FRAMEBUFFER,
+                                                GR_GL_COLOR_ATTACHMENT0,
+                                                texInfo.fTarget,
+                                                texInfo.fID, 0, desc.fSampleCnt));
+    } else {
+        GL_CALL(FramebufferTexture2D(GR_GL_FRAMEBUFFER,
+                                     GR_GL_COLOR_ATTACHMENT0,
+                                     texInfo.fTarget,
+                                     texInfo.fID, 0));
+    }
+    if ((desc.fFlags & kCheckAllocation_GrSurfaceFlag) ||
+        !this->glCaps().isConfigVerifiedColorAttachment(desc.fConfig)) {
+        GL_CALL_RET(status, CheckFramebufferStatus(GR_GL_FRAMEBUFFER));
+        if (status != GR_GL_FRAMEBUFFER_COMPLETE) {
+            goto FAILED;
+        }
+        fGLContext->caps()->markConfigAsValidColorAttachment(desc.fConfig);
+    }
+
+    return true;
+
+FAILED:
+    if (idDesc->fMSColorRenderbufferID) {
+        GL_CALL(DeleteRenderbuffers(1, &idDesc->fMSColorRenderbufferID));
+    }
+    if (idDesc->fRTFBOID != idDesc->fTexFBOID) {
+        GL_CALL(DeleteFramebuffers(1, &idDesc->fRTFBOID));
+    }
+    if (idDesc->fTexFBOID) {
+        GL_CALL(DeleteFramebuffers(1, &idDesc->fTexFBOID));
+    }
+    return false;
+}
+
+// good to set a break-point here to know when createTexture fails
+static GrTexture* return_null_texture() {
+//    SkDEBUGFAIL("null texture");
+    return nullptr;
+}
+
+#if 0 && defined(SK_DEBUG)
+static size_t as_size_t(int x) {
+    return x;
+}
+#endif
+
+GrTexture* GrGLGpu::onCreateTexture(const GrSurfaceDesc& desc,
+                                    GrGpuResource::LifeCycle lifeCycle,
+                                    const void* srcData, size_t rowBytes) {
+    // We fail if the MSAA was requested and is not available.
+    if (GrGLCaps::kNone_MSFBOType == this->glCaps().msFBOType() && desc.fSampleCnt) {
+        //SkDebugf("MSAA RT requested but not supported on this platform.");
+        return return_null_texture();
+    }
+
+    bool renderTarget = SkToBool(desc.fFlags & kRenderTarget_GrSurfaceFlag);
+
+    GrGLTexture::IDDesc idDesc;
+    idDesc.fInfo.fID = 0;
+    GL_CALL(GenTextures(1, &idDesc.fInfo.fID));
+    idDesc.fLifeCycle = lifeCycle;
+    // We only support GL_TEXTURE_2D at the moment.
+    idDesc.fInfo.fTarget = GR_GL_TEXTURE_2D;
+
+    if (!idDesc.fInfo.fID) {
+        return return_null_texture();
+    }
+
+    this->setScratchTextureUnit();
+    GL_CALL(BindTexture(idDesc.fInfo.fTarget, idDesc.fInfo.fID));
+
+    if (renderTarget && this->glCaps().textureUsageSupport()) {
+        // provides a hint about how this texture will be used
+        GL_CALL(TexParameteri(idDesc.fInfo.fTarget,
+                              GR_GL_TEXTURE_USAGE,
+                              GR_GL_FRAMEBUFFER_ATTACHMENT));
+    }
+
+    // Some drivers like to know filter/wrap before seeing glTexImage2D. Some
+    // drivers have a bug where an FBO won't be complete if it includes a
+    // texture that is not mipmap complete (considering the filter in use).
+    GrGLTexture::TexParams initialTexParams;
+    // we only set a subset here so invalidate first
+    initialTexParams.invalidate();
+    initialTexParams.fMinFilter = GR_GL_NEAREST;
+    initialTexParams.fMagFilter = GR_GL_NEAREST;
+    initialTexParams.fWrapS = GR_GL_CLAMP_TO_EDGE;
+    initialTexParams.fWrapT = GR_GL_CLAMP_TO_EDGE;
+    GL_CALL(TexParameteri(idDesc.fInfo.fTarget,
+                          GR_GL_TEXTURE_MAG_FILTER,
+                          initialTexParams.fMagFilter));
+    GL_CALL(TexParameteri(idDesc.fInfo.fTarget,
+                          GR_GL_TEXTURE_MIN_FILTER,
+                          initialTexParams.fMinFilter));
+    GL_CALL(TexParameteri(idDesc.fInfo.fTarget,
+                          GR_GL_TEXTURE_WRAP_S,
+                          initialTexParams.fWrapS));
+    GL_CALL(TexParameteri(idDesc.fInfo.fTarget,
+                          GR_GL_TEXTURE_WRAP_T,
+                          initialTexParams.fWrapT));
+    if (!this->uploadTexData(desc, idDesc.fInfo.fTarget, kNewTexture_UploadType, 0, 0,
+                             desc.fWidth, desc.fHeight,
+                             desc.fConfig, srcData, rowBytes)) {
+        GL_CALL(DeleteTextures(1, &idDesc.fInfo.fID));
+        return return_null_texture();
+    }
+
+    GrGLTexture* tex;
+    if (renderTarget) {
+        // unbind the texture from the texture unit before binding it to the frame buffer
+        GL_CALL(BindTexture(idDesc.fInfo.fTarget, 0));
+        GrGLRenderTarget::IDDesc rtIDDesc;
+
+        if (!this->createRenderTargetObjects(desc, lifeCycle, idDesc.fInfo, &rtIDDesc)) {
+            GL_CALL(DeleteTextures(1, &idDesc.fInfo.fID));
+            return return_null_texture();
+        }
+        tex = new GrGLTextureRenderTarget(this, desc, idDesc, rtIDDesc);
+    } else {
+        tex = new GrGLTexture(this, desc, idDesc);
+    }
+    tex->setCachedTexParams(initialTexParams, this->getResetTimestamp());
+#ifdef TRACE_TEXTURE_CREATION
+    SkDebugf("--- new texture [%d] size=(%d %d) config=%d\n",
+             glTexDesc.fTextureID, desc.fWidth, desc.fHeight, desc.fConfig);
+#endif
+    return tex;
+}
+
+GrTexture* GrGLGpu::onCreateCompressedTexture(const GrSurfaceDesc& desc,
+                                              GrGpuResource::LifeCycle lifeCycle,
+                                              const void* srcData) {
+    // Make sure that we're not flipping Y.
+    if (kBottomLeft_GrSurfaceOrigin == desc.fOrigin) {
+        return return_null_texture();
+    }
+
+    GrGLTexture::IDDesc idDesc;
+    idDesc.fInfo.fID = 0;
+    GL_CALL(GenTextures(1, &idDesc.fInfo.fID));
+    idDesc.fLifeCycle = lifeCycle;
+    // We only support GL_TEXTURE_2D at the moment.
+    idDesc.fInfo.fTarget = GR_GL_TEXTURE_2D;
+
+    if (!idDesc.fInfo.fID) {
+        return return_null_texture();
+    }
+
+    this->setScratchTextureUnit();
+    GL_CALL(BindTexture(idDesc.fInfo.fTarget, idDesc.fInfo.fID));
+
+    // Some drivers like to know filter/wrap before seeing glTexImage2D. Some
+    // drivers have a bug where an FBO won't be complete if it includes a
+    // texture that is not mipmap complete (considering the filter in use).
+    GrGLTexture::TexParams initialTexParams;
+    // we only set a subset here so invalidate first
+    initialTexParams.invalidate();
+    initialTexParams.fMinFilter = GR_GL_NEAREST;
+    initialTexParams.fMagFilter = GR_GL_NEAREST;
+    initialTexParams.fWrapS = GR_GL_CLAMP_TO_EDGE;
+    initialTexParams.fWrapT = GR_GL_CLAMP_TO_EDGE;
+    GL_CALL(TexParameteri(idDesc.fInfo.fTarget,
+                          GR_GL_TEXTURE_MAG_FILTER,
+                          initialTexParams.fMagFilter));
+    GL_CALL(TexParameteri(idDesc.fInfo.fTarget,
+                          GR_GL_TEXTURE_MIN_FILTER,
+                          initialTexParams.fMinFilter));
+    GL_CALL(TexParameteri(idDesc.fInfo.fTarget,
+                          GR_GL_TEXTURE_WRAP_S,
+                          initialTexParams.fWrapS));
+    GL_CALL(TexParameteri(idDesc.fInfo.fTarget,
+                          GR_GL_TEXTURE_WRAP_T,
+                          initialTexParams.fWrapT));
+
+    if (!this->uploadCompressedTexData(desc, idDesc.fInfo.fTarget, srcData)) {
+        GL_CALL(DeleteTextures(1, &idDesc.fInfo.fID));
+        return return_null_texture();
+    }
+
+    GrGLTexture* tex;
+    tex = new GrGLTexture(this, desc, idDesc);
+    tex->setCachedTexParams(initialTexParams, this->getResetTimestamp());
+#ifdef TRACE_TEXTURE_CREATION
+    SkDebugf("--- new compressed texture [%d] size=(%d %d) config=%d\n",
+             glTexDesc.fTextureID, desc.fWidth, desc.fHeight, desc.fConfig);
+#endif
+    return tex;
+}
+
+namespace {
+
+const GrGLuint kUnknownBitCount = GrGLStencilAttachment::kUnknownBitCount;
+
+void inline get_stencil_rb_sizes(const GrGLInterface* gl,
+                                 GrGLStencilAttachment::Format* format) {
+
+    // we shouldn't ever know one size and not the other
+    SkASSERT((kUnknownBitCount == format->fStencilBits) ==
+             (kUnknownBitCount == format->fTotalBits));
+    if (kUnknownBitCount == format->fStencilBits) {
+        GR_GL_GetRenderbufferParameteriv(gl, GR_GL_RENDERBUFFER,
+                                         GR_GL_RENDERBUFFER_STENCIL_SIZE,
+                                         (GrGLint*)&format->fStencilBits);
+        if (format->fPacked) {
+            GR_GL_GetRenderbufferParameteriv(gl, GR_GL_RENDERBUFFER,
+                                             GR_GL_RENDERBUFFER_DEPTH_SIZE,
+                                             (GrGLint*)&format->fTotalBits);
+            format->fTotalBits += format->fStencilBits;
+        } else {
+            format->fTotalBits = format->fStencilBits;
+        }
+    }
+}
+}
+
+int GrGLGpu::getCompatibleStencilIndex(GrPixelConfig config) {
+    static const int kSize = 16;
+    SkASSERT(this->caps()->isConfigRenderable(config, false));
+    if (!this->glCaps().hasStencilFormatBeenDeterminedForConfig(config)) {
+        // Default to unsupported, set this if we find a stencil format that works.
+        int firstWorkingStencilFormatIndex = -1;
+        // Create color texture
+        GrGLuint colorID = 0;
+        GL_CALL(GenTextures(1, &colorID));
+        this->setScratchTextureUnit();
+        GL_CALL(BindTexture(GR_GL_TEXTURE_2D, colorID));
+        GL_CALL(TexParameteri(GR_GL_TEXTURE_2D,
+                              GR_GL_TEXTURE_MAG_FILTER,
+                              GR_GL_NEAREST));
+        GL_CALL(TexParameteri(GR_GL_TEXTURE_2D,
+                              GR_GL_TEXTURE_MIN_FILTER,
+                              GR_GL_NEAREST));
+        GL_CALL(TexParameteri(GR_GL_TEXTURE_2D,
+                              GR_GL_TEXTURE_WRAP_S,
+                              GR_GL_CLAMP_TO_EDGE));
+        GL_CALL(TexParameteri(GR_GL_TEXTURE_2D,
+                              GR_GL_TEXTURE_WRAP_T,
+                              GR_GL_CLAMP_TO_EDGE));
+
+        const GrGLCaps::ConfigFormats colorFormats = this->glCaps().configGLFormats(config);
+
+        CLEAR_ERROR_BEFORE_ALLOC(this->glInterface());
+        GL_ALLOC_CALL(this->glInterface(), TexImage2D(GR_GL_TEXTURE_2D,
+                                                      0,
+                                                      colorFormats.fInternalFormatTexImage,
+                                                      kSize,
+                                                      kSize,
+                                                      0,
+                                                      colorFormats.fExternalFormatForTexImage,
+                                                      colorFormats.fExternalType,
+                                                      NULL));
+        if (GR_GL_NO_ERROR != CHECK_ALLOC_ERROR(this->glInterface())) {
+            GL_CALL(DeleteTextures(1, &colorID));
+            return -1;
+        }
+
+        // unbind the texture from the texture unit before binding it to the frame buffer
+        GL_CALL(BindTexture(GR_GL_TEXTURE_2D, 0));
+
+        // Create Framebuffer
+        GrGLuint fb = 0;
+        GL_CALL(GenFramebuffers(1, &fb));
+        GL_CALL(BindFramebuffer(GR_GL_FRAMEBUFFER, fb));
+        fHWBoundRenderTargetUniqueID = SK_InvalidUniqueID;
+        GL_CALL(FramebufferTexture2D(GR_GL_FRAMEBUFFER,
+                                     GR_GL_COLOR_ATTACHMENT0,
+                                     GR_GL_TEXTURE_2D,
+                                     colorID,
+                                     0));
+        GrGLuint sbRBID = 0;
+        GL_CALL(GenRenderbuffers(1, &sbRBID));
+
+        // look over formats till I find a compatible one
+        int stencilFmtCnt = this->glCaps().stencilFormats().count();
+        if (sbRBID) {
+            GL_CALL(BindRenderbuffer(GR_GL_RENDERBUFFER, sbRBID));
+            for (int i = 0; i < stencilFmtCnt && sbRBID; ++i) {
+                const GrGLCaps::StencilFormat& sFmt = this->glCaps().stencilFormats()[i];
+                CLEAR_ERROR_BEFORE_ALLOC(this->glInterface());
+                GL_ALLOC_CALL(this->glInterface(), RenderbufferStorage(GR_GL_RENDERBUFFER,
+                                                                       sFmt.fInternalFormat,
+                                                                       kSize, kSize));
+                if (GR_GL_NO_ERROR == CHECK_ALLOC_ERROR(this->glInterface())) {
+                    GL_CALL(FramebufferRenderbuffer(GR_GL_FRAMEBUFFER,
+                                                    GR_GL_STENCIL_ATTACHMENT,
+                                                    GR_GL_RENDERBUFFER, sbRBID));
+                    if (sFmt.fPacked) {
+                        GL_CALL(FramebufferRenderbuffer(GR_GL_FRAMEBUFFER,
+                                                        GR_GL_DEPTH_ATTACHMENT,
+                                                        GR_GL_RENDERBUFFER, sbRBID));
+                    } else {
+                        GL_CALL(FramebufferRenderbuffer(GR_GL_FRAMEBUFFER,
+                                                        GR_GL_DEPTH_ATTACHMENT,
+                                                        GR_GL_RENDERBUFFER, 0));
+                    }
+                    GrGLenum status;
+                    GL_CALL_RET(status, CheckFramebufferStatus(GR_GL_FRAMEBUFFER));
+                    if (status == GR_GL_FRAMEBUFFER_COMPLETE) {
+                        firstWorkingStencilFormatIndex = i;
+                        break;
+                    }
+                    GL_CALL(FramebufferRenderbuffer(GR_GL_FRAMEBUFFER,
+                                                    GR_GL_STENCIL_ATTACHMENT,
+                                                    GR_GL_RENDERBUFFER, 0));
+                    if (sFmt.fPacked) {
+                        GL_CALL(FramebufferRenderbuffer(GR_GL_FRAMEBUFFER,
+                                                        GR_GL_DEPTH_ATTACHMENT,
+                                                        GR_GL_RENDERBUFFER, 0));
+                    }
+                }
+            }
+            GL_CALL(DeleteRenderbuffers(1, &sbRBID));
+        }
+        GL_CALL(DeleteTextures(1, &colorID));
+        GL_CALL(BindFramebuffer(GR_GL_FRAMEBUFFER, 0));
+        GL_CALL(DeleteFramebuffers(1, &fb));
+        fGLContext->caps()->setStencilFormatIndexForConfig(config, firstWorkingStencilFormatIndex);
+    }
+    return this->glCaps().getStencilFormatIndexForConfig(config);
+}
+
+GrStencilAttachment* GrGLGpu::createStencilAttachmentForRenderTarget(const GrRenderTarget* rt,
+                                                                     int width,
+                                                                     int height) {
+    // All internally created RTs are also textures. We don't create
+    // SBs for a client's standalone RT (that is a RT that isn't also a texture).
+    SkASSERT(rt->asTexture());
+    SkASSERT(width >= rt->width());
+    SkASSERT(height >= rt->height());
+
+    int samples = rt->numStencilSamples();
+    GrGLStencilAttachment::IDDesc sbDesc;
+
+    int sIdx = this->getCompatibleStencilIndex(rt->config());
+    if (sIdx < 0) {
+        return nullptr;
+    }
+
+    if (!sbDesc.fRenderbufferID) {
+        GL_CALL(GenRenderbuffers(1, &sbDesc.fRenderbufferID));
+    }
+    if (!sbDesc.fRenderbufferID) {
+        return nullptr;
+    }
+    GL_CALL(BindRenderbuffer(GR_GL_RENDERBUFFER, sbDesc.fRenderbufferID));
+    const GrGLCaps::StencilFormat& sFmt = this->glCaps().stencilFormats()[sIdx];
+    CLEAR_ERROR_BEFORE_ALLOC(this->glInterface());
+    // we do this "if" so that we don't call the multisample
+    // version on a GL that doesn't have an MSAA extension.
+    if (samples > 0) {
+        SkAssertResult(renderbuffer_storage_msaa(*fGLContext,
+                                                 samples,
+                                                 sFmt.fInternalFormat,
+                                                 width, height));
+    } else {
+        GL_ALLOC_CALL(this->glInterface(), RenderbufferStorage(GR_GL_RENDERBUFFER,
+                                                               sFmt.fInternalFormat,
+                                                               width, height));
+        SkASSERT(GR_GL_NO_ERROR == check_alloc_error(rt->desc(), this->glInterface()));
+    }
+    fStats.incStencilAttachmentCreates();
+    // After sized formats we attempt an unsized format and take
+    // whatever sizes GL gives us. In that case we query for the size.
+    GrGLStencilAttachment::Format format = sFmt;
+    get_stencil_rb_sizes(this->glInterface(), &format);
+    GrGLStencilAttachment* stencil = new GrGLStencilAttachment(this,
+                                                               sbDesc,
+                                                               width,
+                                                               height,
+                                                               samples,
+                                                               format);
+    return stencil;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+// GL_STREAM_DRAW triggers an optimization in Chromium's GPU process where a client's vertex buffer
+// objects are implemented as client-side-arrays on tile-deferred architectures.
+#define DYNAMIC_USAGE_PARAM GR_GL_STREAM_DRAW
+
+GrVertexBuffer* GrGLGpu::onCreateVertexBuffer(size_t size, bool dynamic) {
+    GrGLVertexBuffer::Desc desc;
+    desc.fUsage = dynamic ? GrGLBufferImpl::kDynamicDraw_Usage : GrGLBufferImpl::kStaticDraw_Usage;
+    desc.fSizeInBytes = size;
+
+    if (this->glCaps().useNonVBOVertexAndIndexDynamicData() && dynamic) {
+        desc.fID = 0;
+        GrGLVertexBuffer* vertexBuffer = new GrGLVertexBuffer(this, desc);
+        return vertexBuffer;
+    } else {
+        desc.fID = 0;
+        GL_CALL(GenBuffers(1, &desc.fID));
+        if (desc.fID) {
+            fHWGeometryState.setVertexBufferID(this, desc.fID);
+            CLEAR_ERROR_BEFORE_ALLOC(this->glInterface());
+            // make sure driver can allocate memory for this buffer
+            GL_ALLOC_CALL(this->glInterface(),
+                          BufferData(GR_GL_ARRAY_BUFFER,
+                                     (GrGLsizeiptr) desc.fSizeInBytes,
+                                     nullptr,   // data ptr
+                                     dynamic ? DYNAMIC_USAGE_PARAM : GR_GL_STATIC_DRAW));
+            if (CHECK_ALLOC_ERROR(this->glInterface()) != GR_GL_NO_ERROR) {
+                GL_CALL(DeleteBuffers(1, &desc.fID));
+                this->notifyVertexBufferDelete(desc.fID);
+                return nullptr;
+            }
+            GrGLVertexBuffer* vertexBuffer = new GrGLVertexBuffer(this, desc);
+            return vertexBuffer;
+        }
+        return nullptr;
+    }
+}
+
+GrIndexBuffer* GrGLGpu::onCreateIndexBuffer(size_t size, bool dynamic) {
+    GrGLIndexBuffer::Desc desc;
+    desc.fUsage = dynamic ? GrGLBufferImpl::kDynamicDraw_Usage : GrGLBufferImpl::kStaticDraw_Usage;
+    desc.fSizeInBytes = size;
+
+    if (this->glCaps().useNonVBOVertexAndIndexDynamicData() && dynamic) {
+        desc.fID = 0;
+        GrIndexBuffer* indexBuffer = new GrGLIndexBuffer(this, desc);
+        return indexBuffer;
+    } else {
+        desc.fID = 0;
+        GL_CALL(GenBuffers(1, &desc.fID));
+        if (desc.fID) {
+            fHWGeometryState.setIndexBufferIDOnDefaultVertexArray(this, desc.fID);
+            CLEAR_ERROR_BEFORE_ALLOC(this->glInterface());
+            // make sure driver can allocate memory for this buffer
+            GL_ALLOC_CALL(this->glInterface(),
+                          BufferData(GR_GL_ELEMENT_ARRAY_BUFFER,
+                                     (GrGLsizeiptr) desc.fSizeInBytes,
+                                     nullptr,  // data ptr
+                                     dynamic ? DYNAMIC_USAGE_PARAM : GR_GL_STATIC_DRAW));
+            if (CHECK_ALLOC_ERROR(this->glInterface()) != GR_GL_NO_ERROR) {
+                GL_CALL(DeleteBuffers(1, &desc.fID));
+                this->notifyIndexBufferDelete(desc.fID);
+                return nullptr;
+            }
+            GrIndexBuffer* indexBuffer = new GrGLIndexBuffer(this, desc);
+            return indexBuffer;
+        }
+        return nullptr;
+    }
+}
+
+GrTransferBuffer* GrGLGpu::onCreateTransferBuffer(size_t size, TransferType xferType) {
+    GrGLCaps::TransferBufferType xferBufferType = this->ctxInfo().caps()->transferBufferType();
+    if (GrGLCaps::kNone_TransferBufferType == xferBufferType) {
+        return nullptr;
+    }
+
+    GrGLTransferBuffer::Desc desc;
+    bool toGpu = (kCpuToGpu_TransferType == xferType);
+    desc.fUsage = toGpu ? GrGLBufferImpl::kStreamDraw_Usage : GrGLBufferImpl::kStreamRead_Usage;
+
+    desc.fSizeInBytes = size;
+    desc.fID = 0;
+    GL_CALL(GenBuffers(1, &desc.fID));
+    if (desc.fID) {
+        CLEAR_ERROR_BEFORE_ALLOC(this->glInterface());
+        // make sure driver can allocate memory for this bmapuffer
+        GrGLenum target;
+        if (GrGLCaps::kChromium_TransferBufferType == xferBufferType) {
+            target = toGpu ? GR_GL_PIXEL_UNPACK_TRANSFER_BUFFER_CHROMIUM
+                         : GR_GL_PIXEL_PACK_TRANSFER_BUFFER_CHROMIUM;
+        } else {
+            SkASSERT(GrGLCaps::kPBO_TransferBufferType == xferBufferType);
+            target = toGpu ? GR_GL_PIXEL_UNPACK_BUFFER : GR_GL_PIXEL_PACK_BUFFER;
+        }
+        GL_CALL(BindBuffer(target, desc.fID));
+        GL_ALLOC_CALL(this->glInterface(), 
+                      BufferData(target,
+                                 (GrGLsizeiptr) desc.fSizeInBytes,
+                                 nullptr,  // data ptr
+                                 (toGpu ? GR_GL_STREAM_DRAW : GR_GL_STREAM_READ)));
+        if (CHECK_ALLOC_ERROR(this->glInterface()) != GR_GL_NO_ERROR) {
+            GL_CALL(DeleteBuffers(1, &desc.fID));
+            return nullptr;
+        }
+        GrTransferBuffer* transferBuffer = new GrGLTransferBuffer(this, desc, target);
+        return transferBuffer;
+    }
+
+    return nullptr;
+}
+
+void GrGLGpu::flushScissor(const GrScissorState& scissorState,
+                           const GrGLIRect& rtViewport,
+                           GrSurfaceOrigin rtOrigin) {
+    if (scissorState.enabled()) {
+        GrGLIRect scissor;
+        scissor.setRelativeTo(rtViewport,
+                              scissorState.rect().fLeft,
+                              scissorState.rect().fTop,
+                              scissorState.rect().width(),
+                              scissorState.rect().height(),
+                              rtOrigin);
+        // if the scissor fully contains the viewport then we fall through and
+        // disable the scissor test.
+        if (!scissor.contains(rtViewport)) {
+            if (fHWScissorSettings.fRect != scissor) {
+                scissor.pushToGLScissor(this->glInterface());
+                fHWScissorSettings.fRect = scissor;
+            }
+            if (kYes_TriState != fHWScissorSettings.fEnabled) {
+                GL_CALL(Enable(GR_GL_SCISSOR_TEST));
+                fHWScissorSettings.fEnabled = kYes_TriState;
+            }
+            return;
+        }
+    }
+
+    // See fall through note above
+    this->disableScissor();
+}
+
+bool GrGLGpu::flushGLState(const DrawArgs& args) {
+    GrXferProcessor::BlendInfo blendInfo;
+    const GrPipeline& pipeline = *args.fPipeline;
+    args.fPipeline->getXferProcessor().getBlendInfo(&blendInfo);
+
+    this->flushColorWrite(blendInfo.fWriteColor);
+    this->flushDrawFace(pipeline.getDrawFace());
+
+    SkAutoTUnref<GrGLProgram> program(fProgramCache->refProgram(args));
+    if (!program) {
+        GrCapsDebugf(this->caps(), "Failed to create program!\n");
+        return false;
+    }
+
+    GrGLuint programID = program->programID();
+    if (fHWProgramID != programID) {
+        GL_CALL(UseProgram(programID));
+        fHWProgramID = programID;
+    }
+
+    if (blendInfo.fWriteColor) {
+        this->flushBlend(blendInfo);
+    }
+
+    SkSTArray<8, const GrTextureAccess*> textureAccesses;
+    program->setData(*args.fPrimitiveProcessor, pipeline, &textureAccesses);
+
+    int numTextureAccesses = textureAccesses.count();
+    for (int i = 0; i < numTextureAccesses; i++) {
+        this->bindTexture(i, textureAccesses[i]->getParams(),
+                          static_cast<GrGLTexture*>(textureAccesses[i]->getTexture()));
+    }
+
+    GrGLRenderTarget* glRT = static_cast<GrGLRenderTarget*>(pipeline.getRenderTarget());
+    this->flushStencil(pipeline.getStencil());
+    this->flushScissor(pipeline.getScissorState(), glRT->getViewport(), glRT->origin());
+    this->flushHWAAState(glRT, pipeline.isHWAntialiasState());
+
+    // This must come after textures are flushed because a texture may need
+    // to be msaa-resolved (which will modify bound FBO state).
+    this->flushRenderTarget(glRT, nullptr);
+
+    return true;
+}
+
+void GrGLGpu::setupGeometry(const GrPrimitiveProcessor& primProc,
+                            const GrNonInstancedVertices& vertices,
+                            size_t* indexOffsetInBytes) {
+    GrGLVertexBuffer* vbuf;
+    vbuf = (GrGLVertexBuffer*) vertices.vertexBuffer();
+
+    SkASSERT(vbuf);
+    SkASSERT(!vbuf->isMapped());
+
+    GrGLIndexBuffer* ibuf = nullptr;
+    if (vertices.isIndexed()) {
+        SkASSERT(indexOffsetInBytes);
+
+        *indexOffsetInBytes = 0;
+        ibuf = (GrGLIndexBuffer*)vertices.indexBuffer();
+
+        SkASSERT(ibuf);
+        SkASSERT(!ibuf->isMapped());
+        *indexOffsetInBytes += ibuf->baseOffset();
+    }
+    GrGLAttribArrayState* attribState =
+        fHWGeometryState.bindArrayAndBuffersToDraw(this, vbuf, ibuf);
+
+    int vaCount = primProc.numAttribs();
+    if (vaCount > 0) {
+
+        GrGLsizei stride = static_cast<GrGLsizei>(primProc.getVertexStride());
+
+        size_t vertexOffsetInBytes = stride * vertices.startVertex();
+
+        vertexOffsetInBytes += vbuf->baseOffset();
+
+        uint32_t usedAttribArraysMask = 0;
+        size_t offset = 0;
+
+        for (int attribIndex = 0; attribIndex < vaCount; attribIndex++) {
+            const GrGeometryProcessor::Attribute& attrib = primProc.getAttrib(attribIndex);
+            usedAttribArraysMask |= (1 << attribIndex);
+            GrVertexAttribType attribType = attrib.fType;
+            attribState->set(this,
+                             attribIndex,
+                             vbuf->bufferID(),
+                             GrGLAttribTypeToLayout(attribType).fCount,
+                             GrGLAttribTypeToLayout(attribType).fType,
+                             GrGLAttribTypeToLayout(attribType).fNormalized,
+                             stride,
+                             reinterpret_cast<GrGLvoid*>(vertexOffsetInBytes + offset));
+            offset += attrib.fOffset;
+        }
+        attribState->disableUnusedArrays(this, usedAttribArraysMask);
+    }
+}
+
+void GrGLGpu::buildProgramDesc(GrProgramDesc* desc,
+                               const GrPrimitiveProcessor& primProc,
+                               const GrPipeline& pipeline) const {
+    if (!GrGLProgramDescBuilder::Build(desc, primProc, pipeline, this)) {
+        SkDEBUGFAIL("Failed to generate GL program descriptor");
+    }
+}
+
+void GrGLGpu::bindBuffer(GrGLuint id, GrGLenum type) {
+    this->handleDirtyContext();
+    if (GR_GL_ARRAY_BUFFER == type) {
+        this->bindVertexBuffer(id);
+    } else if (GR_GL_ELEMENT_ARRAY_BUFFER == type) {
+        this->bindIndexBufferAndDefaultVertexArray(id);
+    } else {
+        GR_GL_CALL(this->glInterface(), BindBuffer(type, id));
+    }
+}
+
+void GrGLGpu::releaseBuffer(GrGLuint id, GrGLenum type) {
+    this->handleDirtyContext();
+    GL_CALL(DeleteBuffers(1, &id));
+    if (GR_GL_ARRAY_BUFFER == type) {
+        this->notifyVertexBufferDelete(id);
+    } else if (GR_GL_ELEMENT_ARRAY_BUFFER == type) {
+        this->notifyIndexBufferDelete(id);
+    }
+}
+
+static GrGLenum get_gl_usage(GrGLBufferImpl::Usage usage) {
+    static const GrGLenum grToGL[] = {
+        GR_GL_STATIC_DRAW,   // GrGLBufferImpl::kStaticDraw_Usage
+        DYNAMIC_USAGE_PARAM, // GrGLBufferImpl::kDynamicDraw_Usage
+        GR_GL_STREAM_DRAW,   // GrGLBufferImpl::kStreamDraw_Usage
+        GR_GL_STREAM_READ,   // GrGLBufferImpl::kStreamRead_Usage
+    };
+    static_assert(SK_ARRAY_COUNT(grToGL) == GrGLBufferImpl::kUsageCount, "array_size_mismatch");
+
+    return grToGL[usage];
+}
+
+void* GrGLGpu::mapBuffer(GrGLuint id, GrGLenum type, GrGLBufferImpl::Usage usage, 
+                         size_t currentSize, size_t requestedSize) {
+    void* mapPtr = nullptr;
+    GrGLenum glUsage = get_gl_usage(usage);
+    bool readOnly = (GrGLBufferImpl::kStreamRead_Usage == usage);
+
+    // Handling dirty context is done in the bindBuffer call
+    switch (this->glCaps().mapBufferType()) {
+        case GrGLCaps::kNone_MapBufferType:
+            break;
+        case GrGLCaps::kMapBuffer_MapBufferType:
+            this->bindBuffer(id, type);
+            // Let driver know it can discard the old data
+            if (GR_GL_USE_BUFFER_DATA_NULL_HINT || currentSize != requestedSize) {
+                GL_CALL(BufferData(type, requestedSize, nullptr, glUsage));
+            }
+            GL_CALL_RET(mapPtr, MapBuffer(type, readOnly ? GR_GL_READ_ONLY : GR_GL_WRITE_ONLY));
+            break;
+        case GrGLCaps::kMapBufferRange_MapBufferType: {
+            this->bindBuffer(id, type);
+            // Make sure the GL buffer size agrees with fDesc before mapping.
+            if (currentSize != requestedSize) {
+                GL_CALL(BufferData(type, requestedSize, nullptr, glUsage));
+            }
+            GrGLbitfield writeAccess = GR_GL_MAP_WRITE_BIT;
+            // TODO: allow the client to specify invalidation in the stream draw case
+            if (GrGLBufferImpl::kStreamDraw_Usage != usage) {
+                writeAccess |= GR_GL_MAP_INVALIDATE_BUFFER_BIT;
+            }
+            GL_CALL_RET(mapPtr, MapBufferRange(type, 0, requestedSize, readOnly ? 
+                                                                       GR_GL_MAP_READ_BIT :                                                       
+                                                                       writeAccess));
+            break;
+        }
+        case GrGLCaps::kChromium_MapBufferType:
+            this->bindBuffer(id, type);
+            // Make sure the GL buffer size agrees with fDesc before mapping.
+            if (currentSize != requestedSize) {
+                GL_CALL(BufferData(type, requestedSize, nullptr, glUsage));
+            }
+            GL_CALL_RET(mapPtr, MapBufferSubData(type, 0, requestedSize, readOnly ? 
+                                                                         GR_GL_READ_ONLY : 
+                                                                         GR_GL_WRITE_ONLY));
+            break;
+    }
+    return mapPtr;
+}
+
+void GrGLGpu::bufferData(GrGLuint id, GrGLenum type, GrGLBufferImpl::Usage usage, 
+                         size_t currentSize, const void* src, size_t srcSizeInBytes) {
+    SkASSERT(srcSizeInBytes <= currentSize);
+    // bindbuffer handles dirty context
+    this->bindBuffer(id, type);
+    GrGLenum glUsage = get_gl_usage(usage);
+
+#if GR_GL_USE_BUFFER_DATA_NULL_HINT
+    if (currentSize == srcSizeInBytes) {
+        GL_CALL(BufferData(type, (GrGLsizeiptr) srcSizeInBytes, src, glUsage));
+    } else {
+        // Before we call glBufferSubData we give the driver a hint using
+        // glBufferData with nullptr. This makes the old buffer contents
+        // inaccessible to future draws. The GPU may still be processing
+        // draws that reference the old contents. With this hint it can
+        // assign a different allocation for the new contents to avoid
+        // flushing the gpu past draws consuming the old contents.
+        // TODO I think we actually want to try calling bufferData here
+        GL_CALL(BufferData(type, currentSize, nullptr, glUsage));
+        GL_CALL(BufferSubData(type, 0, (GrGLsizeiptr) srcSizeInBytes, src));
+    }
+#else
+    // Note that we're cheating on the size here. Currently no methods
+    // allow a partial update that preserves contents of non-updated
+    // portions of the buffer (map() does a glBufferData(..size, nullptr..))
+    GL_CALL(BufferData(type, srcSizeInBytes, src, glUsage));
+#endif
+}
+
+void GrGLGpu::unmapBuffer(GrGLuint id, GrGLenum type, void* mapPtr) {
+    // bind buffer handles the dirty context
+    switch (this->glCaps().mapBufferType()) {
+        case GrGLCaps::kNone_MapBufferType:
+            SkDEBUGFAIL("Shouldn't get here.");
+            return;
+        case GrGLCaps::kMapBuffer_MapBufferType: // fall through
+        case GrGLCaps::kMapBufferRange_MapBufferType:
+            this->bindBuffer(id, type);
+            GL_CALL(UnmapBuffer(type));
+            break;
+        case GrGLCaps::kChromium_MapBufferType:
+            this->bindBuffer(id, type);
+            GL_CALL(UnmapBufferSubData(mapPtr));
+            break;
+    }
+}
+
+void GrGLGpu::disableScissor() {
+    if (kNo_TriState != fHWScissorSettings.fEnabled) {
+        GL_CALL(Disable(GR_GL_SCISSOR_TEST));
+        fHWScissorSettings.fEnabled = kNo_TriState;
+        return;
+    }
+}
+
+void GrGLGpu::onClear(GrRenderTarget* target, const SkIRect& rect, GrColor color) {
+    // parent class should never let us get here with no RT
+    SkASSERT(target);
+    GrGLRenderTarget* glRT = static_cast<GrGLRenderTarget*>(target);
+
+    this->flushRenderTarget(glRT, &rect);
+    GrScissorState scissorState;
+    scissorState.set(rect);
+    this->flushScissor(scissorState, glRT->getViewport(), glRT->origin());
+
+    GrGLfloat r, g, b, a;
+    static const GrGLfloat scale255 = 1.f / 255.f;
+    a = GrColorUnpackA(color) * scale255;
+    GrGLfloat scaleRGB = scale255;
+    r = GrColorUnpackR(color) * scaleRGB;
+    g = GrColorUnpackG(color) * scaleRGB;
+    b = GrColorUnpackB(color) * scaleRGB;
+
+    GL_CALL(ColorMask(GR_GL_TRUE, GR_GL_TRUE, GR_GL_TRUE, GR_GL_TRUE));
+    fHWWriteToColor = kYes_TriState;
+    GL_CALL(ClearColor(r, g, b, a));
+    GL_CALL(Clear(GR_GL_COLOR_BUFFER_BIT));
+}
+
+void GrGLGpu::discard(GrRenderTarget* renderTarget) {
+    SkASSERT(renderTarget);
+    if (!this->caps()->discardRenderTargetSupport()) {
+        return;
+    }
+
+    GrGLRenderTarget* glRT = static_cast<GrGLRenderTarget*>(renderTarget);
+    if (renderTarget->getUniqueID() != fHWBoundRenderTargetUniqueID) {
+        fHWBoundRenderTargetUniqueID = SK_InvalidUniqueID;
+        fStats.incRenderTargetBinds();
+        GL_CALL(BindFramebuffer(GR_GL_FRAMEBUFFER, glRT->renderFBOID()));
+    }
+    switch (this->glCaps().invalidateFBType()) {
+        case GrGLCaps::kNone_InvalidateFBType:
+            SkFAIL("Should never get here.");
+            break;
+        case GrGLCaps::kInvalidate_InvalidateFBType:
+            if (0 == glRT->renderFBOID()) {
+                //  When rendering to the default framebuffer the legal values for attachments
+                //  are GL_COLOR, GL_DEPTH, GL_STENCIL, ... rather than the various FBO attachment
+                //  types.
+                static const GrGLenum attachments[] = { GR_GL_COLOR };
+                GL_CALL(InvalidateFramebuffer(GR_GL_FRAMEBUFFER, SK_ARRAY_COUNT(attachments),
+                        attachments));
+            } else {
+                static const GrGLenum attachments[] = { GR_GL_COLOR_ATTACHMENT0 };
+                GL_CALL(InvalidateFramebuffer(GR_GL_FRAMEBUFFER, SK_ARRAY_COUNT(attachments),
+                        attachments));
+            }
+            break;
+        case GrGLCaps::kDiscard_InvalidateFBType: {
+            if (0 == glRT->renderFBOID()) {
+                //  When rendering to the default framebuffer the legal values for attachments
+                //  are GL_COLOR, GL_DEPTH, GL_STENCIL, ... rather than the various FBO attachment
+                //  types. See glDiscardFramebuffer() spec.
+                static const GrGLenum attachments[] = { GR_GL_COLOR };
+                GL_CALL(DiscardFramebuffer(GR_GL_FRAMEBUFFER, SK_ARRAY_COUNT(attachments),
+                        attachments));
+            } else {
+                static const GrGLenum attachments[] = { GR_GL_COLOR_ATTACHMENT0 };
+                GL_CALL(DiscardFramebuffer(GR_GL_FRAMEBUFFER, SK_ARRAY_COUNT(attachments),
+                        attachments));
+            }
+            break;
+        }
+    }
+    renderTarget->flagAsResolved();
+}
+
+void GrGLGpu::clearStencil(GrRenderTarget* target) {
+    if (nullptr == target) {
+        return;
+    }
+    GrGLRenderTarget* glRT = static_cast<GrGLRenderTarget*>(target);
+    this->flushRenderTarget(glRT, &SkIRect::EmptyIRect());
+
+    this->disableScissor();
+
+    GL_CALL(StencilMask(0xffffffff));
+    GL_CALL(ClearStencil(0));
+    GL_CALL(Clear(GR_GL_STENCIL_BUFFER_BIT));
+    fHWStencilSettings.invalidate();
+}
+
+void GrGLGpu::onClearStencilClip(GrRenderTarget* target, const SkIRect& rect, bool insideClip) {
+    SkASSERT(target);
+
+    GrStencilAttachment* sb = target->renderTargetPriv().getStencilAttachment();
+    // this should only be called internally when we know we have a
+    // stencil buffer.
+    SkASSERT(sb);
+    GrGLint stencilBitCount =  sb->bits();
+#if 0
+    SkASSERT(stencilBitCount > 0);
+    GrGLint clipStencilMask  = (1 << (stencilBitCount - 1));
+#else
+    // we could just clear the clip bit but when we go through
+    // ANGLE a partial stencil mask will cause clears to be
+    // turned into draws. Our contract on GrDrawTarget says that
+    // changing the clip between stencil passes may or may not
+    // zero the client's clip bits. So we just clear the whole thing.
+    static const GrGLint clipStencilMask  = ~0;
+#endif
+    GrGLint value;
+    if (insideClip) {
+        value = (1 << (stencilBitCount - 1));
+    } else {
+        value = 0;
+    }
+    GrGLRenderTarget* glRT = static_cast<GrGLRenderTarget*>(target);
+    this->flushRenderTarget(glRT, &SkIRect::EmptyIRect());
+
+    GrScissorState scissorState;
+    scissorState.set(rect);
+    this->flushScissor(scissorState, glRT->getViewport(), glRT->origin());
+
+    GL_CALL(StencilMask((uint32_t) clipStencilMask));
+    GL_CALL(ClearStencil(value));
+    GL_CALL(Clear(GR_GL_STENCIL_BUFFER_BIT));
+    fHWStencilSettings.invalidate();
+}
+
+static bool read_pixels_pays_for_y_flip(GrRenderTarget* renderTarget, const GrGLCaps& caps,
+                                        int width, int height,  GrPixelConfig config,
+                                        size_t rowBytes) {
+    // If this render target is already TopLeft, we don't need to flip.
+    if (kTopLeft_GrSurfaceOrigin == renderTarget->origin()) {
+        return false;
+    }
+
+    // If the read is really small or smaller than the min texture size, don't force a draw.
+    static const int kMinSize = 32;
+    if (width < kMinSize || height < kMinSize) {
+        return false;
+    }
+
+    // if GL can do the flip then we'll never pay for it.
+    if (caps.packFlipYSupport()) {
+        return false;
+    }
+
+    // If we have to do memcpy to handle non-trim rowBytes then we
+    // get the flip for free. Otherwise it costs.
+    // Note that we're assuming that 0 rowBytes has already been handled and that the width has been
+    // clipped.
+    return caps.packRowLengthSupport() || GrBytesPerPixel(config) * width == rowBytes;
+}
+
+bool GrGLGpu::onGetReadPixelsInfo(GrSurface* srcSurface, int width, int height, size_t rowBytes,
+                                  GrPixelConfig readConfig, DrawPreference* drawPreference,
+                                  ReadPixelTempDrawInfo* tempDrawInfo) {
+    // This subclass can only read pixels from a render target. We could use glTexSubImage2D on
+    // GL versions that support it but we don't today.
+    if (!srcSurface->asRenderTarget()) {
+        ElevateDrawPreference(drawPreference, kRequireDraw_DrawPreference);
+    }
+
+    if (GrPixelConfigIsSRGB(srcSurface->config()) != GrPixelConfigIsSRGB(readConfig)) {
+        ElevateDrawPreference(drawPreference, kRequireDraw_DrawPreference);
+    }
+
+    tempDrawInfo->fSwapRAndB = false;
+
+    // These settings we will always want if a temp draw is performed. The config is set below
+    // depending on whether we want to do a R/B swap or not.
+    tempDrawInfo->fTempSurfaceDesc.fFlags = kRenderTarget_GrSurfaceFlag;
+    tempDrawInfo->fTempSurfaceDesc.fWidth = width;
+    tempDrawInfo->fTempSurfaceDesc.fHeight = height;
+    tempDrawInfo->fTempSurfaceDesc.fSampleCnt = 0;
+    tempDrawInfo->fTempSurfaceDesc.fOrigin = kTopLeft_GrSurfaceOrigin; // no CPU y-flip for TL.
+    tempDrawInfo->fUseExactScratch = this->glCaps().partialFBOReadIsSlow();
+
+    // Start off assuming that any temp draw should be to the readConfig, then check if that will
+    // be inefficient.
+    GrPixelConfig srcConfig = srcSurface->config();
+    tempDrawInfo->fTempSurfaceDesc.fConfig = readConfig;
+
+    if (this->glCaps().rgba8888PixelsOpsAreSlow() && kRGBA_8888_GrPixelConfig == readConfig) {
+        tempDrawInfo->fTempSurfaceDesc.fConfig = kBGRA_8888_GrPixelConfig;
+        tempDrawInfo->fSwapRAndB = true;
+        ElevateDrawPreference(drawPreference, kGpuPrefersDraw_DrawPreference);
+    } else if (kMesa_GrGLDriver == this->glContext().driver() &&
+               GrBytesPerPixel(readConfig) == 4 &&
+               GrPixelConfigSwapRAndB(readConfig) == srcConfig) {
+        // Mesa 3D takes a slow path on when reading back  BGRA from an RGBA surface and vice-versa.
+        // Better to do a draw with a R/B swap and then read as the original config.
+        tempDrawInfo->fTempSurfaceDesc.fConfig = srcConfig;
+        tempDrawInfo->fSwapRAndB = true;
+        ElevateDrawPreference(drawPreference, kGpuPrefersDraw_DrawPreference);
+    } else if (readConfig == kBGRA_8888_GrPixelConfig &&
+               !this->glCaps().readPixelsSupported(this->glInterface(), GR_GL_BGRA,
+                                                   GR_GL_UNSIGNED_BYTE, srcConfig)) {
+        tempDrawInfo->fTempSurfaceDesc.fConfig = kRGBA_8888_GrPixelConfig;
+        tempDrawInfo->fSwapRAndB = true;
+        ElevateDrawPreference(drawPreference, kRequireDraw_DrawPreference);
+    }
+
+    GrRenderTarget* srcAsRT = srcSurface->asRenderTarget();
+    if (!srcAsRT) {
+        ElevateDrawPreference(drawPreference, kRequireDraw_DrawPreference);
+    } else if (read_pixels_pays_for_y_flip(srcAsRT, this->glCaps(), width, height, readConfig,
+                                           rowBytes)) {
+        ElevateDrawPreference(drawPreference, kGpuPrefersDraw_DrawPreference);
+    }
+
+    return true;
+}
+
+bool GrGLGpu::onReadPixels(GrSurface* surface,
+                           int left, int top,
+                           int width, int height,
+                           GrPixelConfig config,
+                           void* buffer,
+                           size_t rowBytes) {
+    SkASSERT(surface);
+
+    GrGLRenderTarget* tgt = static_cast<GrGLRenderTarget*>(surface->asRenderTarget());
+    if (!tgt) {
+        return false;
+    }
+
+    // OpenGL doesn't do sRGB <-> linear conversions when reading and writing pixels.
+    if (GrPixelConfigIsSRGB(surface->config()) != GrPixelConfigIsSRGB(config)) {
+        return false;
+    }
+
+    GrGLenum format = this->glCaps().configGLFormats(config).fExternalFormat;
+    GrGLenum type = this->glCaps().configGLFormats(config).fExternalType;
+    bool flipY = kBottomLeft_GrSurfaceOrigin == surface->origin();
+
+    // resolve the render target if necessary
+    switch (tgt->getResolveType()) {
+        case GrGLRenderTarget::kCantResolve_ResolveType:
+            return false;
+        case GrGLRenderTarget::kAutoResolves_ResolveType:
+            this->flushRenderTarget(tgt, &SkIRect::EmptyIRect());
+            break;
+        case GrGLRenderTarget::kCanResolve_ResolveType:
+            this->onResolveRenderTarget(tgt);
+            // we don't track the state of the READ FBO ID.
+            fStats.incRenderTargetBinds();
+            GL_CALL(BindFramebuffer(GR_GL_READ_FRAMEBUFFER,
+                                    tgt->textureFBOID()));
+            break;
+        default:
+            SkFAIL("Unknown resolve type");
+    }
+
+    const GrGLIRect& glvp = tgt->getViewport();
+
+    // the read rect is viewport-relative
+    GrGLIRect readRect;
+    readRect.setRelativeTo(glvp, left, top, width, height, tgt->origin());
+
+    size_t tightRowBytes = GrBytesPerPixel(config) * width;
+
+    size_t readDstRowBytes = tightRowBytes;
+    void* readDst = buffer;
+
+    // determine if GL can read using the passed rowBytes or if we need
+    // a scratch buffer.
+    SkAutoSMalloc<32 * sizeof(GrColor)> scratch;
+    if (rowBytes != tightRowBytes) {
+        if (this->glCaps().packRowLengthSupport()) {
+            SkASSERT(!(rowBytes % sizeof(GrColor)));
+            GL_CALL(PixelStorei(GR_GL_PACK_ROW_LENGTH,
+                                static_cast<GrGLint>(rowBytes / sizeof(GrColor))));
+            readDstRowBytes = rowBytes;
+        } else {
+            scratch.reset(tightRowBytes * height);
+            readDst = scratch.get();
+        }
+    }
+    if (flipY && this->glCaps().packFlipYSupport()) {
+        GL_CALL(PixelStorei(GR_GL_PACK_REVERSE_ROW_ORDER, 1));
+    }
+    GL_CALL(PixelStorei(GR_GL_PACK_ALIGNMENT, config_alignment(config)));
+
+    GL_CALL(ReadPixels(readRect.fLeft, readRect.fBottom,
+                       readRect.fWidth, readRect.fHeight,
+                       format, type, readDst));
+    if (readDstRowBytes != tightRowBytes) {
+        SkASSERT(this->glCaps().packRowLengthSupport());
+        GL_CALL(PixelStorei(GR_GL_PACK_ROW_LENGTH, 0));
+    }
+    if (flipY && this->glCaps().packFlipYSupport()) {
+        GL_CALL(PixelStorei(GR_GL_PACK_REVERSE_ROW_ORDER, 0));
+        flipY = false;
+    }
+
+    // now reverse the order of the rows, since GL's are bottom-to-top, but our
+    // API presents top-to-bottom. We must preserve the padding contents. Note
+    // that the above readPixels did not overwrite the padding.
+    if (readDst == buffer) {
+        SkASSERT(rowBytes == readDstRowBytes);
+        if (flipY) {
+            scratch.reset(tightRowBytes);
+            void* tmpRow = scratch.get();
+            // flip y in-place by rows
+            const int halfY = height >> 1;
+            char* top = reinterpret_cast<char*>(buffer);
+            char* bottom = top + (height - 1) * rowBytes;
+            for (int y = 0; y < halfY; y++) {
+                memcpy(tmpRow, top, tightRowBytes);
+                memcpy(top, bottom, tightRowBytes);
+                memcpy(bottom, tmpRow, tightRowBytes);
+                top += rowBytes;
+                bottom -= rowBytes;
+            }
+        }
+    } else {
+        SkASSERT(readDst != buffer);        SkASSERT(rowBytes != tightRowBytes);
+        // copy from readDst to buffer while flipping y
+        // const int halfY = height >> 1;
+        const char* src = reinterpret_cast<const char*>(readDst);
+        char* dst = reinterpret_cast<char*>(buffer);
+        if (flipY) {
+            dst += (height-1) * rowBytes;
+        }
+        for (int y = 0; y < height; y++) {
+            memcpy(dst, src, tightRowBytes);
+            src += readDstRowBytes;
+            if (!flipY) {
+                dst += rowBytes;
+            } else {
+                dst -= rowBytes;
+            }
+        }
+    }
+    return true;
+}
+
+void GrGLGpu::flushRenderTarget(GrGLRenderTarget* target, const SkIRect* bound) {
+
+    SkASSERT(target);
+
+    uint32_t rtID = target->getUniqueID();
+    if (fHWBoundRenderTargetUniqueID != rtID) {
+        fStats.incRenderTargetBinds();
+        GL_CALL(BindFramebuffer(GR_GL_FRAMEBUFFER, target->renderFBOID()));
+#ifdef SK_DEBUG
+        // don't do this check in Chromium -- this is causing
+        // lots of repeated command buffer flushes when the compositor is
+        // rendering with Ganesh, which is really slow; even too slow for
+        // Debug mode.
+        if (kChromium_GrGLDriver != this->glContext().driver()) {
+            GrGLenum status;
+            GL_CALL_RET(status, CheckFramebufferStatus(GR_GL_FRAMEBUFFER));
+            if (status != GR_GL_FRAMEBUFFER_COMPLETE) {
+                SkDebugf("GrGLGpu::flushRenderTarget glCheckFramebufferStatus %x\n", status);
+            }
+        }
+#endif
+        fHWBoundRenderTargetUniqueID = rtID;
+        const GrGLIRect& vp = target->getViewport();
+        if (fHWViewport != vp) {
+            vp.pushToGLViewport(this->glInterface());
+            fHWViewport = vp;
+        }
+        if (this->glCaps().srgbWriteControl()) {
+            bool enableSRGBWrite = GrPixelConfigIsSRGB(target->config());
+            if (enableSRGBWrite && kYes_TriState != fHWSRGBFramebuffer) {
+                GL_CALL(Enable(GR_GL_FRAMEBUFFER_SRGB));
+                fHWSRGBFramebuffer = kYes_TriState;
+            } else if (!enableSRGBWrite && kNo_TriState != fHWSRGBFramebuffer) {
+                GL_CALL(Disable(GR_GL_FRAMEBUFFER_SRGB));
+                fHWSRGBFramebuffer = kNo_TriState;
+            }
+        }
+    }
+    if (nullptr == bound || !bound->isEmpty()) {
+        target->flagAsNeedingResolve(bound);
+    }
+
+    GrTexture *texture = target->asTexture();
+    if (texture) {
+        texture->texturePriv().dirtyMipMaps(true);
+    }
+}
+
+GrGLenum gPrimitiveType2GLMode[] = {
+    GR_GL_TRIANGLES,
+    GR_GL_TRIANGLE_STRIP,
+    GR_GL_TRIANGLE_FAN,
+    GR_GL_POINTS,
+    GR_GL_LINES,
+    GR_GL_LINE_STRIP
+};
+
+#define SWAP_PER_DRAW 0
+
+#if SWAP_PER_DRAW
+    #if defined(SK_BUILD_FOR_MAC)
+        #include <AGL/agl.h>
+    #elif defined(SK_BUILD_FOR_WIN32)
+        #include <gl/GL.h>
+        void SwapBuf() {
+            DWORD procID = GetCurrentProcessId();
+            HWND hwnd = GetTopWindow(GetDesktopWindow());
+            while(hwnd) {
+                DWORD wndProcID = 0;
+                GetWindowThreadProcessId(hwnd, &wndProcID);
+                if(wndProcID == procID) {
+                    SwapBuffers(GetDC(hwnd));
+                }
+                hwnd = GetNextWindow(hwnd, GW_HWNDNEXT);
+            }
+         }
+    #endif
+#endif
+
+void GrGLGpu::onDraw(const DrawArgs& args, const GrNonInstancedVertices& vertices) {
+    if (!this->flushGLState(args)) {
+        return;
+    }
+
+    size_t indexOffsetInBytes = 0;
+    this->setupGeometry(*args.fPrimitiveProcessor, vertices, &indexOffsetInBytes);
+
+    SkASSERT((size_t)vertices.primitiveType() < SK_ARRAY_COUNT(gPrimitiveType2GLMode));
+
+    if (vertices.isIndexed()) {
+        GrGLvoid* indices =
+            reinterpret_cast<GrGLvoid*>(indexOffsetInBytes + sizeof(uint16_t) *
+                                        vertices.startIndex());
+        // info.startVertex() was accounted for by setupGeometry.
+        GL_CALL(DrawElements(gPrimitiveType2GLMode[vertices.primitiveType()],
+                             vertices.indexCount(),
+                             GR_GL_UNSIGNED_SHORT,
+                             indices));
+    } else {
+        // Pass 0 for parameter first. We have to adjust glVertexAttribPointer() to account for
+        // startVertex in the DrawElements case. So we always rely on setupGeometry to have
+        // accounted for startVertex.
+        GL_CALL(DrawArrays(gPrimitiveType2GLMode[vertices.primitiveType()], 0,
+                           vertices.vertexCount()));
+    }
+#if SWAP_PER_DRAW
+    glFlush();
+    #if defined(SK_BUILD_FOR_MAC)
+        aglSwapBuffers(aglGetCurrentContext());
+        int set_a_break_pt_here = 9;
+        aglSwapBuffers(aglGetCurrentContext());
+    #elif defined(SK_BUILD_FOR_WIN32)
+        SwapBuf();
+        int set_a_break_pt_here = 9;
+        SwapBuf();
+    #endif
+#endif
+}
+
+void GrGLGpu::onResolveRenderTarget(GrRenderTarget* target) {
+    GrGLRenderTarget* rt = static_cast<GrGLRenderTarget*>(target);
+    if (rt->needsResolve()) {
+        // Some extensions automatically resolves the texture when it is read.
+        if (this->glCaps().usesMSAARenderBuffers()) {
+            SkASSERT(rt->textureFBOID() != rt->renderFBOID());
+            fStats.incRenderTargetBinds();
+            fStats.incRenderTargetBinds();
+            GL_CALL(BindFramebuffer(GR_GL_READ_FRAMEBUFFER, rt->renderFBOID()));
+            GL_CALL(BindFramebuffer(GR_GL_DRAW_FRAMEBUFFER, rt->textureFBOID()));
+            // make sure we go through flushRenderTarget() since we've modified
+            // the bound DRAW FBO ID.
+            fHWBoundRenderTargetUniqueID = SK_InvalidUniqueID;
+            const GrGLIRect& vp = rt->getViewport();
+            const SkIRect dirtyRect = rt->getResolveRect();
+
+            if (GrGLCaps::kES_Apple_MSFBOType == this->glCaps().msFBOType()) {
+                // Apple's extension uses the scissor as the blit bounds.
+                GrScissorState scissorState;
+                scissorState.set(dirtyRect);
+                this->flushScissor(scissorState, vp, rt->origin());
+                GL_CALL(ResolveMultisampleFramebuffer());
+            } else {
+                GrGLIRect r;
+                r.setRelativeTo(vp, dirtyRect.fLeft, dirtyRect.fTop,
+                                dirtyRect.width(), dirtyRect.height(), target->origin());
+
+                int right = r.fLeft + r.fWidth;
+                int top = r.fBottom + r.fHeight;
+
+                // BlitFrameBuffer respects the scissor, so disable it.
+                this->disableScissor();
+                GL_CALL(BlitFramebuffer(r.fLeft, r.fBottom, right, top,
+                                        r.fLeft, r.fBottom, right, top,
+                                        GR_GL_COLOR_BUFFER_BIT, GR_GL_NEAREST));
+            }
+        }
+        rt->flagAsResolved();
+    }
+}
+
+namespace {
+
+
+GrGLenum gr_to_gl_stencil_op(GrStencilOp op) {
+    static const GrGLenum gTable[] = {
+        GR_GL_KEEP,        // kKeep_StencilOp
+        GR_GL_REPLACE,     // kReplace_StencilOp
+        GR_GL_INCR_WRAP,   // kIncWrap_StencilOp
+        GR_GL_INCR,        // kIncClamp_StencilOp
+        GR_GL_DECR_WRAP,   // kDecWrap_StencilOp
+        GR_GL_DECR,        // kDecClamp_StencilOp
+        GR_GL_ZERO,        // kZero_StencilOp
+        GR_GL_INVERT,      // kInvert_StencilOp
+    };
+    GR_STATIC_ASSERT(SK_ARRAY_COUNT(gTable) == kStencilOpCount);
+    GR_STATIC_ASSERT(0 == kKeep_StencilOp);
+    GR_STATIC_ASSERT(1 == kReplace_StencilOp);
+    GR_STATIC_ASSERT(2 == kIncWrap_StencilOp);
+    GR_STATIC_ASSERT(3 == kIncClamp_StencilOp);
+    GR_STATIC_ASSERT(4 == kDecWrap_StencilOp);
+    GR_STATIC_ASSERT(5 == kDecClamp_StencilOp);
+    GR_STATIC_ASSERT(6 == kZero_StencilOp);
+    GR_STATIC_ASSERT(7 == kInvert_StencilOp);
+    SkASSERT((unsigned) op < kStencilOpCount);
+    return gTable[op];
+}
+
+void set_gl_stencil(const GrGLInterface* gl,
+                    const GrStencilSettings& settings,
+                    GrGLenum glFace,
+                    GrStencilSettings::Face grFace) {
+    GrGLenum glFunc = GrToGLStencilFunc(settings.func(grFace));
+    GrGLenum glFailOp = gr_to_gl_stencil_op(settings.failOp(grFace));
+    GrGLenum glPassOp = gr_to_gl_stencil_op(settings.passOp(grFace));
+
+    GrGLint ref = settings.funcRef(grFace);
+    GrGLint mask = settings.funcMask(grFace);
+    GrGLint writeMask = settings.writeMask(grFace);
+
+    if (GR_GL_FRONT_AND_BACK == glFace) {
+        // we call the combined func just in case separate stencil is not
+        // supported.
+        GR_GL_CALL(gl, StencilFunc(glFunc, ref, mask));
+        GR_GL_CALL(gl, StencilMask(writeMask));
+        GR_GL_CALL(gl, StencilOp(glFailOp, GR_GL_KEEP, glPassOp));
+    } else {
+        GR_GL_CALL(gl, StencilFuncSeparate(glFace, glFunc, ref, mask));
+        GR_GL_CALL(gl, StencilMaskSeparate(glFace, writeMask));
+        GR_GL_CALL(gl, StencilOpSeparate(glFace, glFailOp, GR_GL_KEEP, glPassOp));
+    }
+}
+}
+
+void GrGLGpu::flushStencil(const GrStencilSettings& stencilSettings) {
+    if (fHWStencilSettings != stencilSettings) {
+        if (stencilSettings.isDisabled()) {
+            if (kNo_TriState != fHWStencilTestEnabled) {
+                GL_CALL(Disable(GR_GL_STENCIL_TEST));
+                fHWStencilTestEnabled = kNo_TriState;
+            }
+        } else {
+            if (kYes_TriState != fHWStencilTestEnabled) {
+                GL_CALL(Enable(GR_GL_STENCIL_TEST));
+                fHWStencilTestEnabled = kYes_TriState;
+            }
+        }
+        if (!stencilSettings.isDisabled()) {
+            if (this->caps()->twoSidedStencilSupport()) {
+                set_gl_stencil(this->glInterface(),
+                               stencilSettings,
+                               GR_GL_FRONT,
+                               GrStencilSettings::kFront_Face);
+                set_gl_stencil(this->glInterface(),
+                               stencilSettings,
+                               GR_GL_BACK,
+                               GrStencilSettings::kBack_Face);
+            } else {
+                set_gl_stencil(this->glInterface(),
+                               stencilSettings,
+                               GR_GL_FRONT_AND_BACK,
+                               GrStencilSettings::kFront_Face);
+            }
+        }
+        fHWStencilSettings = stencilSettings;
+    }
+}
+
+void GrGLGpu::flushHWAAState(GrRenderTarget* rt, bool useHWAA) {
+    SkASSERT(!useHWAA || rt->isStencilBufferMultisampled());
+
+    if (this->glCaps().multisampleDisableSupport()) {
+        if (useHWAA) {
+            if (kYes_TriState != fMSAAEnabled) {
+                GL_CALL(Enable(GR_GL_MULTISAMPLE));
+                fMSAAEnabled = kYes_TriState;
+            }
+        } else {
+            if (kNo_TriState != fMSAAEnabled) {
+                GL_CALL(Disable(GR_GL_MULTISAMPLE));
+                fMSAAEnabled = kNo_TriState;
+            }
+        }
+    }
+}
+
+void GrGLGpu::flushBlend(const GrXferProcessor::BlendInfo& blendInfo) {
+    // Any optimization to disable blending should have already been applied and
+    // tweaked the equation to "add" or "subtract", and the coeffs to (1, 0).
+
+    GrBlendEquation equation = blendInfo.fEquation;
+    GrBlendCoeff srcCoeff = blendInfo.fSrcBlend;
+    GrBlendCoeff dstCoeff = blendInfo.fDstBlend;
+    bool blendOff = (kAdd_GrBlendEquation == equation || kSubtract_GrBlendEquation == equation) &&
+                    kOne_GrBlendCoeff == srcCoeff && kZero_GrBlendCoeff == dstCoeff;
+    if (blendOff) {
+        if (kNo_TriState != fHWBlendState.fEnabled) {
+            GL_CALL(Disable(GR_GL_BLEND));
+
+            // Workaround for the ARM KHR_blend_equation_advanced blacklist issue
+            // https://code.google.com/p/skia/issues/detail?id=3943
+            if (kARM_GrGLVendor == this->ctxInfo().vendor() &&
+                GrBlendEquationIsAdvanced(fHWBlendState.fEquation)) {
+                SkASSERT(this->caps()->advancedBlendEquationSupport());
+                // Set to any basic blending equation.
+                GrBlendEquation blend_equation = kAdd_GrBlendEquation;
+                GL_CALL(BlendEquation(gXfermodeEquation2Blend[blend_equation]));
+                fHWBlendState.fEquation = blend_equation;
+            }
+
+            fHWBlendState.fEnabled = kNo_TriState;
+        }
+        return;
+    }
+
+    if (kYes_TriState != fHWBlendState.fEnabled) {
+        GL_CALL(Enable(GR_GL_BLEND));
+        fHWBlendState.fEnabled = kYes_TriState;
+    }
+
+    if (fHWBlendState.fEquation != equation) {
+        GL_CALL(BlendEquation(gXfermodeEquation2Blend[equation]));
+        fHWBlendState.fEquation = equation;
+    }
+
+    if (GrBlendEquationIsAdvanced(equation)) {
+        SkASSERT(this->caps()->advancedBlendEquationSupport());
+        // Advanced equations have no other blend state.
+        return;
+    }
+
+    if (fHWBlendState.fSrcCoeff != srcCoeff ||
+        fHWBlendState.fDstCoeff != dstCoeff) {
+        GL_CALL(BlendFunc(gXfermodeCoeff2Blend[srcCoeff],
+                          gXfermodeCoeff2Blend[dstCoeff]));
+        fHWBlendState.fSrcCoeff = srcCoeff;
+        fHWBlendState.fDstCoeff = dstCoeff;
+    }
+
+    GrColor blendConst = blendInfo.fBlendConstant;
+    if ((BlendCoeffReferencesConstant(srcCoeff) ||
+         BlendCoeffReferencesConstant(dstCoeff)) &&
+        (!fHWBlendState.fConstColorValid ||
+         fHWBlendState.fConstColor != blendConst)) {
+        GrGLfloat c[4];
+        GrColorToRGBAFloat(blendConst, c);
+        GL_CALL(BlendColor(c[0], c[1], c[2], c[3]));
+        fHWBlendState.fConstColor = blendConst;
+        fHWBlendState.fConstColorValid = true;
+    }
+}
+
+static inline GrGLenum tile_to_gl_wrap(SkShader::TileMode tm) {
+    static const GrGLenum gWrapModes[] = {
+        GR_GL_CLAMP_TO_EDGE,
+        GR_GL_REPEAT,
+        GR_GL_MIRRORED_REPEAT
+    };
+    GR_STATIC_ASSERT(SkShader::kTileModeCount == SK_ARRAY_COUNT(gWrapModes));
+    GR_STATIC_ASSERT(0 == SkShader::kClamp_TileMode);
+    GR_STATIC_ASSERT(1 == SkShader::kRepeat_TileMode);
+    GR_STATIC_ASSERT(2 == SkShader::kMirror_TileMode);
+    return gWrapModes[tm];
+}
+
+static GrGLenum get_component_enum_from_char(char component) {
+    switch (component) {
+        case 'r':
+           return GR_GL_RED;
+        case 'g':
+           return GR_GL_GREEN;
+        case 'b':
+           return GR_GL_BLUE;
+        case 'a':
+           return GR_GL_ALPHA;
+        default:
+            SkFAIL("Unsupported component");
+            return 0;
+    }
+}
+
+/** If texture swizzling is available using tex parameters then it is preferred over mangling
+  the generated shader code. This potentially allows greater reuse of cached shaders. */
+static void get_tex_param_swizzle(GrPixelConfig config,
+                                  const GrGLSLCaps& caps,
+                                  GrGLenum* glSwizzle) {
+    const char* swizzle = caps.getSwizzleMap(config);
+    for (int i = 0; i < 4; ++i) {
+        glSwizzle[i] = get_component_enum_from_char(swizzle[i]);
+    }
+}
+
+void GrGLGpu::bindTexture(int unitIdx, const GrTextureParams& params, GrGLTexture* texture) {
+    SkASSERT(texture);
+
+#ifdef SK_DEBUG
+    if (!this->caps()->npotTextureTileSupport()) {
+        const bool tileX = SkShader::kClamp_TileMode != params.getTileModeX();
+        const bool tileY = SkShader::kClamp_TileMode != params.getTileModeY();
+        if (tileX || tileY) {
+            const int w = texture->width();
+            const int h = texture->height();
+            SkASSERT(SkIsPow2(w) && SkIsPow2(h));
+        }
+    }
+#endif
+
+    // If we created a rt/tex and rendered to it without using a texture and now we're texturing
+    // from the rt it will still be the last bound texture, but it needs resolving. So keep this
+    // out of the "last != next" check.
+    GrGLRenderTarget* texRT = static_cast<GrGLRenderTarget*>(texture->asRenderTarget());
+    if (texRT) {
+        this->onResolveRenderTarget(texRT);
+    }
+
+    uint32_t textureID = texture->getUniqueID();
+    GrGLenum target = texture->target();
+    if (fHWBoundTextureUniqueIDs[unitIdx] != textureID) {
+        this->setTextureUnit(unitIdx);
+        GL_CALL(BindTexture(target, texture->textureID()));
+        fHWBoundTextureUniqueIDs[unitIdx] = textureID;
+    }
+
+    ResetTimestamp timestamp;
+    const GrGLTexture::TexParams& oldTexParams = texture->getCachedTexParams(&timestamp);
+    bool setAll = timestamp < this->getResetTimestamp();
+    GrGLTexture::TexParams newTexParams;
+
+    static GrGLenum glMinFilterModes[] = {
+        GR_GL_NEAREST,
+        GR_GL_LINEAR,
+        GR_GL_LINEAR_MIPMAP_LINEAR
+    };
+    static GrGLenum glMagFilterModes[] = {
+        GR_GL_NEAREST,
+        GR_GL_LINEAR,
+        GR_GL_LINEAR
+    };
+    GrTextureParams::FilterMode filterMode = params.filterMode();
+
+    if (GrTextureParams::kMipMap_FilterMode == filterMode) {
+        if (!this->caps()->mipMapSupport() || GrPixelConfigIsCompressed(texture->config())) {
+            filterMode = GrTextureParams::kBilerp_FilterMode;
+        }
+    }
+
+    newTexParams.fMinFilter = glMinFilterModes[filterMode];
+    newTexParams.fMagFilter = glMagFilterModes[filterMode];
+
+    if (GrTextureParams::kMipMap_FilterMode == filterMode &&
+        texture->texturePriv().mipMapsAreDirty()) {
+        GL_CALL(GenerateMipmap(target));
+        texture->texturePriv().dirtyMipMaps(false);
+    }
+
+    newTexParams.fWrapS = tile_to_gl_wrap(params.getTileModeX());
+    newTexParams.fWrapT = tile_to_gl_wrap(params.getTileModeY());
+    get_tex_param_swizzle(texture->config(), *this->glCaps().glslCaps(), newTexParams.fSwizzleRGBA);
+    if (setAll || newTexParams.fMagFilter != oldTexParams.fMagFilter) {
+        this->setTextureUnit(unitIdx);
+        GL_CALL(TexParameteri(target, GR_GL_TEXTURE_MAG_FILTER, newTexParams.fMagFilter));
+    }
+    if (setAll || newTexParams.fMinFilter != oldTexParams.fMinFilter) {
+        this->setTextureUnit(unitIdx);
+        GL_CALL(TexParameteri(target, GR_GL_TEXTURE_MIN_FILTER, newTexParams.fMinFilter));
+    }
+    if (setAll || newTexParams.fWrapS != oldTexParams.fWrapS) {
+        this->setTextureUnit(unitIdx);
+        GL_CALL(TexParameteri(target, GR_GL_TEXTURE_WRAP_S, newTexParams.fWrapS));
+    }
+    if (setAll || newTexParams.fWrapT != oldTexParams.fWrapT) {
+        this->setTextureUnit(unitIdx);
+        GL_CALL(TexParameteri(target, GR_GL_TEXTURE_WRAP_T, newTexParams.fWrapT));
+    }
+    if (!this->glCaps().glslCaps()->mustSwizzleInShader() &&
+        (setAll || memcmp(newTexParams.fSwizzleRGBA,
+                          oldTexParams.fSwizzleRGBA,
+                          sizeof(newTexParams.fSwizzleRGBA)))) {
+        this->setTextureUnit(unitIdx);
+        if (this->glStandard() == kGLES_GrGLStandard) {
+            // ES3 added swizzle support but not GL_TEXTURE_SWIZZLE_RGBA.
+            const GrGLenum* swizzle = newTexParams.fSwizzleRGBA;
+            GL_CALL(TexParameteri(target, GR_GL_TEXTURE_SWIZZLE_R, swizzle[0]));
+            GL_CALL(TexParameteri(target, GR_GL_TEXTURE_SWIZZLE_G, swizzle[1]));
+            GL_CALL(TexParameteri(target, GR_GL_TEXTURE_SWIZZLE_B, swizzle[2]));
+            GL_CALL(TexParameteri(target, GR_GL_TEXTURE_SWIZZLE_A, swizzle[3]));
+        } else {
+            GR_STATIC_ASSERT(sizeof(newTexParams.fSwizzleRGBA[0]) == sizeof(GrGLint));
+            const GrGLint* swizzle = reinterpret_cast<const GrGLint*>(newTexParams.fSwizzleRGBA);
+            GL_CALL(TexParameteriv(target, GR_GL_TEXTURE_SWIZZLE_RGBA, swizzle));
+        }
+    }
+    texture->setCachedTexParams(newTexParams, this->getResetTimestamp());
+}
+
+void GrGLGpu::flushColorWrite(bool writeColor) {
+    if (!writeColor) {
+        if (kNo_TriState != fHWWriteToColor) {
+            GL_CALL(ColorMask(GR_GL_FALSE, GR_GL_FALSE,
+                              GR_GL_FALSE, GR_GL_FALSE));
+            fHWWriteToColor = kNo_TriState;
+        }
+    } else {
+        if (kYes_TriState != fHWWriteToColor) {
+            GL_CALL(ColorMask(GR_GL_TRUE, GR_GL_TRUE, GR_GL_TRUE, GR_GL_TRUE));
+            fHWWriteToColor = kYes_TriState;
+        }
+    }
+}
+
+void GrGLGpu::flushDrawFace(GrPipelineBuilder::DrawFace face) {
+    if (fHWDrawFace != face) {
+        switch (face) {
+            case GrPipelineBuilder::kCCW_DrawFace:
+                GL_CALL(Enable(GR_GL_CULL_FACE));
+                GL_CALL(CullFace(GR_GL_BACK));
+                break;
+            case GrPipelineBuilder::kCW_DrawFace:
+                GL_CALL(Enable(GR_GL_CULL_FACE));
+                GL_CALL(CullFace(GR_GL_FRONT));
+                break;
+            case GrPipelineBuilder::kBoth_DrawFace:
+                GL_CALL(Disable(GR_GL_CULL_FACE));
+                break;
+            default:
+                SkFAIL("Unknown draw face.");
+        }
+        fHWDrawFace = face;
+    }
+}
+
+void GrGLGpu::setTextureUnit(int unit) {
+    SkASSERT(unit >= 0 && unit < fHWBoundTextureUniqueIDs.count());
+    if (unit != fHWActiveTextureUnitIdx) {
+        GL_CALL(ActiveTexture(GR_GL_TEXTURE0 + unit));
+        fHWActiveTextureUnitIdx = unit;
+    }
+}
+
+void GrGLGpu::setScratchTextureUnit() {
+    // Bind the last texture unit since it is the least likely to be used by GrGLProgram.
+    int lastUnitIdx = fHWBoundTextureUniqueIDs.count() - 1;
+    if (lastUnitIdx != fHWActiveTextureUnitIdx) {
+        GL_CALL(ActiveTexture(GR_GL_TEXTURE0 + lastUnitIdx));
+        fHWActiveTextureUnitIdx = lastUnitIdx;
+    }
+    // clear out the this field so that if a program does use this unit it will rebind the correct
+    // texture.
+    fHWBoundTextureUniqueIDs[lastUnitIdx] = SK_InvalidUniqueID;
+}
+
+// Determines whether glBlitFramebuffer could be used between src and dst.
+static inline bool can_blit_framebuffer(const GrSurface* dst,
+                                        const GrSurface* src,
+                                        const GrGLGpu* gpu) {
+    if (gpu->glCaps().isConfigRenderable(dst->config(), dst->desc().fSampleCnt > 0) &&
+        gpu->glCaps().isConfigRenderable(src->config(), src->desc().fSampleCnt > 0) &&
+        gpu->glCaps().usesMSAARenderBuffers()) {
+        // ES3 doesn't allow framebuffer blits when the src has MSAA and the configs don't match
+        // or the rects are not the same (not just the same size but have the same edges).
+        if (GrGLCaps::kES_3_0_MSFBOType == gpu->glCaps().msFBOType() &&
+            (src->desc().fSampleCnt > 0 || src->config() != dst->config())) {
+           return false;
+        }
+        const GrGLTexture* dstTex = static_cast<const GrGLTexture*>(dst->asTexture());
+        if (dstTex && dstTex->target() != GR_GL_TEXTURE_2D) {
+            return false;
+        }
+        const GrGLTexture* srcTex = static_cast<const GrGLTexture*>(dst->asTexture());
+        if (srcTex && srcTex->target() != GR_GL_TEXTURE_2D) {
+            return false;
+        }
+        return true;
+    } else {
+        return false;
+    }
+}
+
+static inline bool can_copy_texsubimage(const GrSurface* dst,
+                                        const GrSurface* src,
+                                        const GrGLGpu* gpu) {
+    // Table 3.9 of the ES2 spec indicates the supported formats with CopyTexSubImage
+    // and BGRA isn't in the spec. There doesn't appear to be any extension that adds it. Perhaps
+    // many drivers would allow it to work, but ANGLE does not.
+    if (kGLES_GrGLStandard == gpu->glStandard() && gpu->glCaps().bgraIsInternalFormat() &&
+        (kBGRA_8888_GrPixelConfig == dst->config() || kBGRA_8888_GrPixelConfig == src->config())) {
+        return false;
+    }
+    const GrGLRenderTarget* dstRT = static_cast<const GrGLRenderTarget*>(dst->asRenderTarget());
+    // If dst is multisampled (and uses an extension where there is a separate MSAA renderbuffer)
+    // then we don't want to copy to the texture but to the MSAA buffer.
+    if (dstRT && dstRT->renderFBOID() != dstRT->textureFBOID()) {
+        return false;
+    }
+    const GrGLRenderTarget* srcRT = static_cast<const GrGLRenderTarget*>(src->asRenderTarget());
+    // If the src is multisampled (and uses an extension where there is a separate MSAA
+    // renderbuffer) then it is an invalid operation to call CopyTexSubImage
+    if (srcRT && srcRT->renderFBOID() != srcRT->textureFBOID()) {
+        return false;
+    }
+
+    const GrGLTexture* dstTex = static_cast<const GrGLTexture*>(dst->asTexture());
+    // CopyTex(Sub)Image writes to a texture and we have no way of dynamically wrapping a RT in a
+    // texture.
+    if (!dstTex) {
+        return false;
+    }
+
+    const GrGLTexture* srcTex = static_cast<const GrGLTexture*>(src->asTexture());
+    
+    // Check that we could wrap the source in an FBO, that the dst is TEXTURE_2D, that no mirroring
+    // is required.
+    if (gpu->glCaps().isConfigRenderable(src->config(), src->desc().fSampleCnt > 0) &&
+        !GrPixelConfigIsCompressed(src->config()) &&
+        (!srcTex || srcTex->target() == GR_GL_TEXTURE_2D) &&
+        dstTex->target() == GR_GL_TEXTURE_2D &&
+        dst->origin() == src->origin()) {
+        return true;
+    } else {
+        return false;
+    }
+}
+
+// If a temporary FBO was created, its non-zero ID is returned. The viewport that the copy rect is
+// relative to is output.
+void GrGLGpu::bindSurfaceFBOForCopy(GrSurface* surface, GrGLenum fboTarget, GrGLIRect* viewport,
+                                    TempFBOTarget tempFBOTarget) {
+    GrGLRenderTarget* rt = static_cast<GrGLRenderTarget*>(surface->asRenderTarget());
+    if (nullptr == rt) {
+        SkASSERT(surface->asTexture());
+        GrGLuint texID = static_cast<GrGLTexture*>(surface->asTexture())->textureID();
+        GrGLenum target = static_cast<GrGLTexture*>(surface->asTexture())->target();
+        GrGLuint* tempFBOID;
+        tempFBOID = kSrc_TempFBOTarget == tempFBOTarget ? &fTempSrcFBOID : &fTempDstFBOID;
+
+        if (0 == *tempFBOID) {
+            GR_GL_CALL(this->glInterface(), GenFramebuffers(1, tempFBOID));
+        }
+
+        fStats.incRenderTargetBinds();
+        GR_GL_CALL(this->glInterface(), BindFramebuffer(fboTarget, *tempFBOID));
+        GR_GL_CALL(this->glInterface(), FramebufferTexture2D(fboTarget,
+                                                             GR_GL_COLOR_ATTACHMENT0,
+                                                             target,
+                                                             texID,
+                                                             0));
+        viewport->fLeft = 0;
+        viewport->fBottom = 0;
+        viewport->fWidth = surface->width();
+        viewport->fHeight = surface->height();
+    } else {
+        fStats.incRenderTargetBinds();
+        GR_GL_CALL(this->glInterface(), BindFramebuffer(fboTarget, rt->renderFBOID()));
+        *viewport = rt->getViewport();
+    }
+}
+
+void GrGLGpu::unbindTextureFBOForCopy(GrGLenum fboTarget, GrSurface* surface) {
+    // bindSurfaceFBOForCopy temporarily binds textures that are not render targets to 
+    if (!surface->asRenderTarget()) {
+        SkASSERT(surface->asTexture());
+        GrGLenum textureTarget = static_cast<GrGLTexture*>(surface->asTexture())->target();
+        GR_GL_CALL(this->glInterface(), FramebufferTexture2D(fboTarget,
+                                                             GR_GL_COLOR_ATTACHMENT0,
+                                                             textureTarget,
+                                                             0,
+                                                             0));
+    }
+}
+
+bool GrGLGpu::initCopySurfaceDstDesc(const GrSurface* src, GrSurfaceDesc* desc) const {
+    // If the src is a texture, we can implement the blit as a draw assuming the config is
+    // renderable.
+    if (src->asTexture() && this->caps()->isConfigRenderable(src->config(), false)) {
+        desc->fOrigin = kDefault_GrSurfaceOrigin;
+        desc->fFlags = kRenderTarget_GrSurfaceFlag;
+        desc->fConfig = src->config();
+        return true;
+    }
+
+    const GrGLTexture* srcTexture = static_cast<const GrGLTexture*>(src->asTexture());
+    if (srcTexture && srcTexture->target() != GR_GL_TEXTURE_2D) {
+        // Not supported for FBO blit or CopyTexSubImage
+        return false;
+    }
+
+    // We look for opportunities to use CopyTexSubImage, or fbo blit. If neither are
+    // possible and we return false to fallback to creating a render target dst for render-to-
+    // texture. This code prefers CopyTexSubImage to fbo blit and avoids triggering temporary fbo
+    // creation. It isn't clear that avoiding temporary fbo creation is actually optimal.
+
+    // Check for format issues with glCopyTexSubImage2D
+    if (kGLES_GrGLStandard == this->glStandard() && this->glCaps().bgraIsInternalFormat() &&
+        kBGRA_8888_GrPixelConfig == src->config()) {
+        // glCopyTexSubImage2D doesn't work with this config. If the bgra can be used with fbo blit
+        // then we set up for that, otherwise fail.
+        if (this->caps()->isConfigRenderable(kBGRA_8888_GrPixelConfig, false)) {
+            desc->fOrigin = kDefault_GrSurfaceOrigin;
+            desc->fFlags = kRenderTarget_GrSurfaceFlag;
+            desc->fConfig = kBGRA_8888_GrPixelConfig;
+            return true;
+        }
+        return false;
+    } else if (nullptr == src->asRenderTarget()) {
+        // CopyTexSubImage2D or fbo blit would require creating a temp fbo for the src.
+        return false;
+    }
+
+    const GrGLRenderTarget* srcRT = static_cast<const GrGLRenderTarget*>(src->asRenderTarget());
+    if (srcRT && srcRT->renderFBOID() != srcRT->textureFBOID()) {
+        // It's illegal to call CopyTexSubImage2D on a MSAA renderbuffer. Set up for FBO blit or
+        // fail.
+        if (this->caps()->isConfigRenderable(src->config(), false)) {
+            desc->fOrigin = kDefault_GrSurfaceOrigin;
+            desc->fFlags = kRenderTarget_GrSurfaceFlag;
+            desc->fConfig = src->config();
+            return true;
+        }
+        return false;
+    }
+
+    // We'll do a CopyTexSubImage. Make the dst a plain old texture.
+    desc->fConfig = src->config();
+    desc->fOrigin = src->origin();
+    desc->fFlags = kNone_GrSurfaceFlags;
+    return true;
+}
+
+bool GrGLGpu::onCopySurface(GrSurface* dst,
+                            GrSurface* src,
+                            const SkIRect& srcRect,
+                            const SkIPoint& dstPoint) {
+    if (src->asTexture() && dst->asRenderTarget()) {
+        this->copySurfaceAsDraw(dst, src, srcRect, dstPoint);
+        return true;
+    }
+    
+    if (can_copy_texsubimage(dst, src, this)) {
+        this->copySurfaceAsCopyTexSubImage(dst, src, srcRect, dstPoint);
+        return true;
+    }
+
+    if (can_blit_framebuffer(dst, src, this)) {
+        return this->copySurfaceAsBlitFramebuffer(dst, src, srcRect, dstPoint);
+    }
+
+    return false;
+}
+
+void GrGLGpu::createCopyPrograms() {
+    for (size_t i = 0; i < SK_ARRAY_COUNT(fCopyPrograms); ++i) {
+        fCopyPrograms[i].fProgram = 0;
+    }
+    const char* version = this->glCaps().glslCaps()->versionDeclString();
+    static const GrSLType kSamplerTypes[2] = { kSampler2D_GrSLType, kSamplerExternal_GrSLType };
+    SkASSERT(2 == SK_ARRAY_COUNT(fCopyPrograms));
+    int programCount = this->glCaps().externalTextureSupport() ? 2 : 1;
+    for (int i = 0; i < programCount; ++i) {
+        GrGLSLShaderVar aVertex("a_vertex", kVec2f_GrSLType, GrShaderVar::kAttribute_TypeModifier);
+        GrGLSLShaderVar uTexCoordXform("u_texCoordXform", kVec4f_GrSLType,
+                                     GrShaderVar::kUniform_TypeModifier);
+        GrGLSLShaderVar uPosXform("u_posXform", kVec4f_GrSLType,
+                                  GrShaderVar::kUniform_TypeModifier);
+        GrGLSLShaderVar uTexture("u_texture", kSamplerTypes[i],
+                                 GrShaderVar::kUniform_TypeModifier);
+        GrGLSLShaderVar vTexCoord("v_texCoord", kVec2f_GrSLType,
+                                  GrShaderVar::kVaryingOut_TypeModifier);
+        GrGLSLShaderVar oFragColor("o_FragColor", kVec4f_GrSLType,
+                                   GrShaderVar::kOut_TypeModifier);
+
+        SkString vshaderTxt(version);
+        aVertex.appendDecl(this->glCaps().glslCaps(), &vshaderTxt);
+        vshaderTxt.append(";");
+        uTexCoordXform.appendDecl(this->glCaps().glslCaps(), &vshaderTxt);
+        vshaderTxt.append(";");
+        uPosXform.appendDecl(this->glCaps().glslCaps(), &vshaderTxt);
+        vshaderTxt.append(";");
+        vTexCoord.appendDecl(this->glCaps().glslCaps(), &vshaderTxt);
+        vshaderTxt.append(";");
+    
+        vshaderTxt.append(
+            "// Copy Program VS\n"
+            "void main() {"
+            "  v_texCoord = a_vertex.xy * u_texCoordXform.xy + u_texCoordXform.zw;"
+            "  gl_Position.xy = a_vertex * u_posXform.xy + u_posXform.zw;"
+            "  gl_Position.zw = vec2(0, 1);"
+            "}"
+        );
+
+        SkString fshaderTxt(version);
+        if (kSamplerTypes[i] == kSamplerExternal_GrSLType) {
+            fshaderTxt.appendf("#extension %s : require\n",
+                               this->glCaps().glslCaps()->externalTextureExtensionString());
+        }
+        GrGLSLAppendDefaultFloatPrecisionDeclaration(kDefault_GrSLPrecision,
+                                                     *this->glCaps().glslCaps(),
+                                                     &fshaderTxt);
+        vTexCoord.setTypeModifier(GrShaderVar::kVaryingIn_TypeModifier);
+        vTexCoord.appendDecl(this->glCaps().glslCaps(), &fshaderTxt);
+        fshaderTxt.append(";");
+        uTexture.appendDecl(this->glCaps().glslCaps(), &fshaderTxt);
+        fshaderTxt.append(";");
+        const char* fsOutName;
+        if (this->glCaps().glslCaps()->mustDeclareFragmentShaderOutput()) {
+            oFragColor.appendDecl(this->glCaps().glslCaps(), &fshaderTxt);
+            fshaderTxt.append(";");
+            fsOutName = oFragColor.c_str();
+        } else {
+            fsOutName = "gl_FragColor";
+        }
+        fshaderTxt.appendf(
+            "// Copy Program FS\n"
+            "void main() {"
+            "  %s = %s(u_texture, v_texCoord);"
+            "}",
+            fsOutName,
+            GrGLSLTexture2DFunctionName(kVec2f_GrSLType, this->glslGeneration())
+        );
+    
+        GL_CALL_RET(fCopyPrograms[i].fProgram, CreateProgram());
+        const char* str;
+        GrGLint length;
+
+        str = vshaderTxt.c_str();
+        length = SkToInt(vshaderTxt.size());
+        GrGLuint vshader = GrGLCompileAndAttachShader(*fGLContext, fCopyPrograms[i].fProgram,
+                                                      GR_GL_VERTEX_SHADER, &str, &length, 1,
+                                                      &fStats);
+
+        str = fshaderTxt.c_str();
+        length = SkToInt(fshaderTxt.size());
+        GrGLuint fshader = GrGLCompileAndAttachShader(*fGLContext, fCopyPrograms[i].fProgram,
+                                                      GR_GL_FRAGMENT_SHADER, &str, &length, 1,
+                                                      &fStats);
+
+        GL_CALL(LinkProgram(fCopyPrograms[i].fProgram));
+
+        GL_CALL_RET(fCopyPrograms[i].fTextureUniform,
+                    GetUniformLocation(fCopyPrograms[i].fProgram, "u_texture"));
+        GL_CALL_RET(fCopyPrograms[i].fPosXformUniform,
+                    GetUniformLocation(fCopyPrograms[i].fProgram, "u_posXform"));
+        GL_CALL_RET(fCopyPrograms[i].fTexCoordXformUniform,
+                    GetUniformLocation(fCopyPrograms[i].fProgram, "u_texCoordXform"));
+
+        GL_CALL(BindAttribLocation(fCopyPrograms[i].fProgram, 0, "a_vertex"));
+
+        GL_CALL(DeleteShader(vshader));
+        GL_CALL(DeleteShader(fshader));
+    }
+    fCopyProgramArrayBuffer = 0;
+    GL_CALL(GenBuffers(1, &fCopyProgramArrayBuffer));
+    fHWGeometryState.setVertexBufferID(this, fCopyProgramArrayBuffer);
+    static const GrGLfloat vdata[] = {
+        0, 0,
+        0, 1,
+        1, 0,
+        1, 1
+    };
+    GL_ALLOC_CALL(this->glInterface(),
+                  BufferData(GR_GL_ARRAY_BUFFER,
+                             (GrGLsizeiptr) sizeof(vdata),
+                             vdata,  // data ptr
+                             GR_GL_STATIC_DRAW));
+}
+
+void GrGLGpu::createWireRectProgram() {
+    SkASSERT(!fWireRectProgram.fProgram);
+    GrGLSLShaderVar uColor("u_color", kVec4f_GrSLType, GrShaderVar::kUniform_TypeModifier);
+    GrGLSLShaderVar uRect("u_rect", kVec4f_GrSLType, GrShaderVar::kUniform_TypeModifier);
+    GrGLSLShaderVar aVertex("a_vertex", kVec2f_GrSLType, GrShaderVar::kAttribute_TypeModifier);
+    const char* version = this->glCaps().glslCaps()->versionDeclString();
+
+    // The rect uniform specifies the rectangle in NDC space as a vec4 (left,top,right,bottom). The
+    // program is used with a vbo containing the unit square. Vertices are computed from the rect
+    // uniform using the 4 vbo vertices.
+    SkString vshaderTxt(version);
+    aVertex.appendDecl(this->glCaps().glslCaps(), &vshaderTxt);
+    vshaderTxt.append(";");
+    uRect.appendDecl(this->glCaps().glslCaps(), &vshaderTxt);
+    vshaderTxt.append(";");
+    vshaderTxt.append(
+        "// Wire Rect Program VS\n"
+        "void main() {"
+        "  gl_Position.x = u_rect.x + a_vertex.x * (u_rect.z - u_rect.x);"
+        "  gl_Position.y = u_rect.y + a_vertex.y * (u_rect.w - u_rect.y);"
+        "  gl_Position.zw = vec2(0, 1);"
+        "}"
+    );
+
+    GrGLSLShaderVar oFragColor("o_FragColor", kVec4f_GrSLType, GrShaderVar::kOut_TypeModifier);
+
+    SkString fshaderTxt(version);
+    GrGLSLAppendDefaultFloatPrecisionDeclaration(kDefault_GrSLPrecision,
+                                                 *this->glCaps().glslCaps(),
+                                                 &fshaderTxt);
+    uColor.appendDecl(this->glCaps().glslCaps(), &fshaderTxt);
+    fshaderTxt.append(";");
+    const char* fsOutName;
+    if (this->glCaps().glslCaps()->mustDeclareFragmentShaderOutput()) {
+        oFragColor.appendDecl(this->glCaps().glslCaps(), &fshaderTxt);
+        fshaderTxt.append(";");
+        fsOutName = oFragColor.c_str();
+    } else {
+        fsOutName = "gl_FragColor";
+    }
+    fshaderTxt.appendf(
+        "// Write Rect Program FS\n"
+        "void main() {"
+        "  %s = %s;"
+        "}",
+        fsOutName,
+        uColor.c_str()
+    );
+
+    GL_CALL_RET(fWireRectProgram.fProgram, CreateProgram());
+    const char* str;
+    GrGLint length;
+
+    str = vshaderTxt.c_str();
+    length = SkToInt(vshaderTxt.size());
+    GrGLuint vshader = GrGLCompileAndAttachShader(*fGLContext, fWireRectProgram.fProgram,
+                                                  GR_GL_VERTEX_SHADER, &str, &length, 1,
+                                                  &fStats);
+
+    str = fshaderTxt.c_str();
+    length = SkToInt(fshaderTxt.size());
+    GrGLuint fshader = GrGLCompileAndAttachShader(*fGLContext, fWireRectProgram.fProgram,
+                                                  GR_GL_FRAGMENT_SHADER, &str, &length, 1,
+                                                  &fStats);
+
+    GL_CALL(LinkProgram(fWireRectProgram.fProgram));
+
+    GL_CALL_RET(fWireRectProgram.fColorUniform,
+                GetUniformLocation(fWireRectProgram.fProgram, "u_color"));
+    GL_CALL_RET(fWireRectProgram.fRectUniform,
+                GetUniformLocation(fWireRectProgram.fProgram, "u_rect"));
+    GL_CALL(BindAttribLocation(fWireRectProgram.fProgram, 0, "a_vertex"));
+
+    GL_CALL(DeleteShader(vshader));
+    GL_CALL(DeleteShader(fshader));
+    GL_CALL(GenBuffers(1, &fWireRectArrayBuffer));
+    fHWGeometryState.setVertexBufferID(this, fWireRectArrayBuffer);
+    static const GrGLfloat vdata[] = {
+        0, 0,
+        0, 1,
+        1, 1,
+        1, 0,
+    };
+    GL_ALLOC_CALL(this->glInterface(),
+                  BufferData(GR_GL_ARRAY_BUFFER,
+                             (GrGLsizeiptr) sizeof(vdata),
+                             vdata,  // data ptr
+                             GR_GL_STATIC_DRAW));
+}
+
+void GrGLGpu::drawDebugWireRect(GrRenderTarget* rt, const SkIRect& rect, GrColor color) {
+    this->handleDirtyContext();
+    if (!fWireRectProgram.fProgram) {
+        this->createWireRectProgram();
+    }
+
+    int w = rt->width();
+    int h = rt->height();
+
+    // Compute the edges of the rectangle (top,left,right,bottom) in NDC space. Must consider
+    // whether the render target is flipped or not.
+    GrGLfloat edges[4];
+    edges[0] = SkIntToScalar(rect.fLeft) + 0.5f;
+    edges[2] = SkIntToScalar(rect.fRight) - 0.5f;
+    if (kBottomLeft_GrSurfaceOrigin == rt->origin()) {
+        edges[1] = h - (SkIntToScalar(rect.fTop) + 0.5f);
+        edges[3] = h - (SkIntToScalar(rect.fBottom) - 0.5f);
+    } else {
+        edges[1] = SkIntToScalar(rect.fTop) + 0.5f;
+        edges[3] = SkIntToScalar(rect.fBottom) - 0.5f;
+    }
+    edges[0] = 2 * edges[0] / w - 1.0f;
+    edges[1] = 2 * edges[1] / h - 1.0f;
+    edges[2] = 2 * edges[2] / w - 1.0f;
+    edges[3] = 2 * edges[3] / h - 1.0f;
+
+    GrGLfloat channels[4];
+    static const GrGLfloat scale255 = 1.f / 255.f;
+    channels[0] = GrColorUnpackR(color) * scale255;
+    channels[1] = GrColorUnpackG(color) * scale255;
+    channels[2] = GrColorUnpackB(color) * scale255;
+    channels[3] = GrColorUnpackA(color) * scale255;
+
+    GrGLRenderTarget* glRT = static_cast<GrGLRenderTarget*>(rt->asRenderTarget());
+    this->flushRenderTarget(glRT, &rect);
+
+    GL_CALL(UseProgram(fWireRectProgram.fProgram));
+    fHWProgramID = fWireRectProgram.fProgram;
+
+    fHWGeometryState.setVertexArrayID(this, 0);
+
+    GrGLAttribArrayState* attribs =
+        fHWGeometryState.bindArrayAndBufferToDraw(this, fWireRectArrayBuffer);
+    attribs->set(this, 0, fWireRectArrayBuffer, 2, GR_GL_FLOAT, false, 2 * sizeof(GrGLfloat), 0);
+    attribs->disableUnusedArrays(this, 0x1);
+
+    GL_CALL(Uniform4fv(fWireRectProgram.fRectUniform, 1, edges));
+    GL_CALL(Uniform4fv(fWireRectProgram.fColorUniform, 1, channels));
+
+    GrXferProcessor::BlendInfo blendInfo;
+    blendInfo.reset();
+    this->flushBlend(blendInfo);
+    this->flushColorWrite(true);
+    this->flushDrawFace(GrPipelineBuilder::kBoth_DrawFace);
+    this->flushHWAAState(glRT, false);
+    this->disableScissor();
+    GrStencilSettings stencil;
+    stencil.setDisabled();
+    this->flushStencil(stencil);
+
+    GL_CALL(DrawArrays(GR_GL_LINE_LOOP, 0, 4));
+}
+
+
+void GrGLGpu::copySurfaceAsDraw(GrSurface* dst,
+                                GrSurface* src,
+                                const SkIRect& srcRect,
+                                const SkIPoint& dstPoint) {
+    int w = srcRect.width();
+    int h = srcRect.height();
+
+    GrGLTexture* srcTex = static_cast<GrGLTexture*>(src->asTexture());
+    GrTextureParams params(SkShader::kClamp_TileMode, GrTextureParams::kNone_FilterMode);
+    this->bindTexture(0, params, srcTex);
+
+    GrGLRenderTarget* dstRT = static_cast<GrGLRenderTarget*>(dst->asRenderTarget());
+    SkIRect dstRect = SkIRect::MakeXYWH(dstPoint.fX, dstPoint.fY, w, h);
+    this->flushRenderTarget(dstRT, &dstRect);
+
+    int progIdx = TextureTargetToCopyProgramIdx(srcTex->target());
+
+    GL_CALL(UseProgram(fCopyPrograms[progIdx].fProgram));
+    fHWProgramID = fCopyPrograms[progIdx].fProgram;
+
+    fHWGeometryState.setVertexArrayID(this, 0);
+
+    GrGLAttribArrayState* attribs =
+        fHWGeometryState.bindArrayAndBufferToDraw(this, fCopyProgramArrayBuffer);
+    attribs->set(this, 0, fCopyProgramArrayBuffer, 2, GR_GL_FLOAT, false, 2 * sizeof(GrGLfloat), 0);
+    attribs->disableUnusedArrays(this, 0x1);
+
+    // dst rect edges in NDC (-1 to 1)
+    int dw = dst->width();
+    int dh = dst->height();
+    GrGLfloat dx0 = 2.f * dstPoint.fX / dw - 1.f;
+    GrGLfloat dx1 = 2.f * (dstPoint.fX + w) / dw - 1.f;
+    GrGLfloat dy0 = 2.f * dstPoint.fY / dh - 1.f;
+    GrGLfloat dy1 = 2.f * (dstPoint.fY + h) / dh - 1.f;
+    if (kBottomLeft_GrSurfaceOrigin == dst->origin()) {
+        dy0 = -dy0;
+        dy1 = -dy1;
+    }
+
+    // src rect edges in normalized texture space (0 to 1)
+    int sw = src->width();
+    int sh = src->height();
+    GrGLfloat sx0 = (GrGLfloat)srcRect.fLeft / sw;
+    GrGLfloat sx1 = (GrGLfloat)(srcRect.fLeft + w) / sw;
+    GrGLfloat sy0 = (GrGLfloat)srcRect.fTop / sh;
+    GrGLfloat sy1 = (GrGLfloat)(srcRect.fTop + h) / sh;
+    if (kBottomLeft_GrSurfaceOrigin == src->origin()) {
+        sy0 = 1.f - sy0;
+        sy1 = 1.f - sy1;
+    }
+
+    GL_CALL(Uniform4f(fCopyPrograms[progIdx].fPosXformUniform, dx1 - dx0, dy1 - dy0, dx0, dy0));
+    GL_CALL(Uniform4f(fCopyPrograms[progIdx].fTexCoordXformUniform,
+                      sx1 - sx0, sy1 - sy0, sx0, sy0));
+    GL_CALL(Uniform1i(fCopyPrograms[progIdx].fTextureUniform, 0));
+
+    GrXferProcessor::BlendInfo blendInfo;
+    blendInfo.reset();
+    this->flushBlend(blendInfo);
+    this->flushColorWrite(true);
+    this->flushDrawFace(GrPipelineBuilder::kBoth_DrawFace);
+    this->flushHWAAState(dstRT, false);
+    this->disableScissor();
+    GrStencilSettings stencil;
+    stencil.setDisabled();
+    this->flushStencil(stencil);
+
+    GL_CALL(DrawArrays(GR_GL_TRIANGLE_STRIP, 0, 4));
+}
+
+void GrGLGpu::copySurfaceAsCopyTexSubImage(GrSurface* dst,
+                                           GrSurface* src,
+                                           const SkIRect& srcRect,
+                                           const SkIPoint& dstPoint) {
+    SkASSERT(can_copy_texsubimage(dst, src, this));
+    GrGLIRect srcVP;
+    this->bindSurfaceFBOForCopy(src, GR_GL_FRAMEBUFFER, &srcVP, kSrc_TempFBOTarget);
+    GrGLTexture* dstTex = static_cast<GrGLTexture*>(dst->asTexture());
+    SkASSERT(dstTex);
+    // We modified the bound FBO
+    fHWBoundRenderTargetUniqueID = SK_InvalidUniqueID;
+    GrGLIRect srcGLRect;
+    srcGLRect.setRelativeTo(srcVP,
+                            srcRect.fLeft,
+                            srcRect.fTop,
+                            srcRect.width(),
+                            srcRect.height(),
+                            src->origin());
+
+    this->setScratchTextureUnit();
+    GL_CALL(BindTexture(dstTex->target(), dstTex->textureID()));
+    GrGLint dstY;
+    if (kBottomLeft_GrSurfaceOrigin == dst->origin()) {
+        dstY = dst->height() - (dstPoint.fY + srcGLRect.fHeight);
+    } else {
+        dstY = dstPoint.fY;
+    }
+    GL_CALL(CopyTexSubImage2D(dstTex->target(), 0,
+                                dstPoint.fX, dstY,
+                                srcGLRect.fLeft, srcGLRect.fBottom,
+                                srcGLRect.fWidth, srcGLRect.fHeight));
+    this->unbindTextureFBOForCopy(GR_GL_FRAMEBUFFER, src);
+}
+
+bool GrGLGpu::copySurfaceAsBlitFramebuffer(GrSurface* dst,
+                                           GrSurface* src,
+                                           const SkIRect& srcRect,
+                                           const SkIPoint& dstPoint) {
+    SkASSERT(can_blit_framebuffer(dst, src, this));
+    SkIRect dstRect = SkIRect::MakeXYWH(dstPoint.fX, dstPoint.fY,
+                                        srcRect.width(), srcRect.height());
+    if (dst == src) {
+        if (SkIRect::IntersectsNoEmptyCheck(dstRect, srcRect)) {
+            return false;
+        }
+    }
+
+    GrGLIRect dstVP;
+    GrGLIRect srcVP;
+    this->bindSurfaceFBOForCopy(dst, GR_GL_DRAW_FRAMEBUFFER, &dstVP, kDst_TempFBOTarget);
+    this->bindSurfaceFBOForCopy(src, GR_GL_READ_FRAMEBUFFER, &srcVP, kSrc_TempFBOTarget);
+    // We modified the bound FBO
+    fHWBoundRenderTargetUniqueID = SK_InvalidUniqueID;
+    GrGLIRect srcGLRect;
+    GrGLIRect dstGLRect;
+    srcGLRect.setRelativeTo(srcVP,
+                            srcRect.fLeft,
+                            srcRect.fTop,
+                            srcRect.width(),
+                            srcRect.height(),
+                            src->origin());
+    dstGLRect.setRelativeTo(dstVP,
+                            dstRect.fLeft,
+                            dstRect.fTop,
+                            dstRect.width(),
+                            dstRect.height(),
+                            dst->origin());
+
+    // BlitFrameBuffer respects the scissor, so disable it.
+    this->disableScissor();
+
+    GrGLint srcY0;
+    GrGLint srcY1;
+    // Does the blit need to y-mirror or not?
+    if (src->origin() == dst->origin()) {
+        srcY0 = srcGLRect.fBottom;
+        srcY1 = srcGLRect.fBottom + srcGLRect.fHeight;
+    } else {
+        srcY0 = srcGLRect.fBottom + srcGLRect.fHeight;
+        srcY1 = srcGLRect.fBottom;
+    }
+    GL_CALL(BlitFramebuffer(srcGLRect.fLeft,
+                            srcY0,
+                            srcGLRect.fLeft + srcGLRect.fWidth,
+                            srcY1,
+                            dstGLRect.fLeft,
+                            dstGLRect.fBottom,
+                            dstGLRect.fLeft + dstGLRect.fWidth,
+                            dstGLRect.fBottom + dstGLRect.fHeight,
+                            GR_GL_COLOR_BUFFER_BIT, GR_GL_NEAREST));
+    this->unbindTextureFBOForCopy(GR_GL_DRAW_FRAMEBUFFER, dst);
+    this->unbindTextureFBOForCopy(GR_GL_READ_FRAMEBUFFER, src);
+    return true;
+}
+
+void GrGLGpu::xferBarrier(GrRenderTarget* rt, GrXferBarrierType type) {
+    SkASSERT(type);
+    switch (type) {
+        case kTexture_GrXferBarrierType: {
+            GrGLRenderTarget* glrt = static_cast<GrGLRenderTarget*>(rt);
+            if (glrt->textureFBOID() != glrt->renderFBOID()) {
+                // The render target uses separate storage so no need for glTextureBarrier.
+                // FIXME: The render target will resolve automatically when its texture is bound,
+                // but we could resolve only the bounds that will be read if we do it here instead.
+                return;
+            }
+            SkASSERT(this->caps()->textureBarrierSupport());
+            GL_CALL(TextureBarrier());
+            return;
+        }
+        case kBlend_GrXferBarrierType:
+            SkASSERT(GrCaps::kAdvanced_BlendEquationSupport ==
+                     this->caps()->blendEquationSupport());
+            GL_CALL(BlendBarrier());
+            return;
+        default: break; // placate compiler warnings that kNone not handled
+    }
+}
+
+GrBackendObject GrGLGpu::createTestingOnlyBackendTexture(void* pixels, int w, int h,
+                                                         GrPixelConfig config) const {
+    if (!this->caps()->isConfigTexturable(config)) {
+        return false;
+    }
+    GrGLTextureInfo* info = new GrGLTextureInfo;
+    info->fTarget = GR_GL_TEXTURE_2D;
+    info->fID = 0;
+    GL_CALL(GenTextures(1, &info->fID));
+    GL_CALL(ActiveTexture(GR_GL_TEXTURE0));
+    GL_CALL(PixelStorei(GR_GL_UNPACK_ALIGNMENT, 1));
+    GL_CALL(BindTexture(info->fTarget, info->fID));
+    GL_CALL(TexParameteri(info->fTarget, GR_GL_TEXTURE_MAG_FILTER, GR_GL_NEAREST));
+    GL_CALL(TexParameteri(info->fTarget, GR_GL_TEXTURE_MIN_FILTER, GR_GL_NEAREST));
+    GL_CALL(TexParameteri(info->fTarget, GR_GL_TEXTURE_WRAP_S, GR_GL_CLAMP_TO_EDGE));
+    GL_CALL(TexParameteri(info->fTarget, GR_GL_TEXTURE_WRAP_T, GR_GL_CLAMP_TO_EDGE));
+
+    GrGLenum internalFormat = this->glCaps().configGLFormats(config).fInternalFormatTexImage;
+    GrGLenum externalFormat = this->glCaps().configGLFormats(config).fExternalFormatForTexImage;
+    GrGLenum externalType = this->glCaps().configGLFormats(config).fExternalType;
+
+    GL_CALL(TexImage2D(info->fTarget, 0, internalFormat, w, h, 0, externalFormat,
+                       externalType, pixels));
+
+#ifdef SK_IGNORE_GL_TEXTURE_TARGET
+    GrGLuint id = info->fID;
+    delete info;
+    return id;
+#else
+    return reinterpret_cast<GrBackendObject>(info);
+#endif
+}
+
+bool GrGLGpu::isTestingOnlyBackendTexture(GrBackendObject id) const {
+#ifdef SK_IGNORE_GL_TEXTURE_TARGET
+    GrGLuint texID = (GrGLuint)id;
+#else
+    GrGLuint texID = reinterpret_cast<const GrGLTextureInfo*>(id)->fID;
+#endif
+
+    GrGLboolean result;
+    GL_CALL_RET(result, IsTexture(texID));
+
+    return (GR_GL_TRUE == result);
+}
+
+void GrGLGpu::deleteTestingOnlyBackendTexture(GrBackendObject id, bool abandonTexture) const {
+#ifdef SK_IGNORE_GL_TEXTURE_TARGET
+    GrGLuint texID = (GrGLuint)id;
+#else
+    const GrGLTextureInfo* info = reinterpret_cast<const GrGLTextureInfo*>(id);
+    GrGLuint texID = info->fID;
+#endif
+
+    if (!abandonTexture) {
+        GL_CALL(DeleteTextures(1, &texID));
+    }
+
+#ifndef SK_IGNORE_GL_TEXTURE_TARGET
+    delete info;
+#endif
+}
+
+void GrGLGpu::resetShaderCacheForTesting() const {
+    fProgramCache->abandon();
+}
+
+///////////////////////////////////////////////////////////////////////////////
+GrGLAttribArrayState* GrGLGpu::HWGeometryState::bindArrayAndBuffersToDraw(
+                                                GrGLGpu* gpu,
+                                                const GrGLVertexBuffer* vbuffer,
+                                                const GrGLIndexBuffer* ibuffer) {
+    SkASSERT(vbuffer);
+    GrGLuint vbufferID = vbuffer->bufferID();
+    GrGLuint* ibufferIDPtr = nullptr;
+    GrGLuint ibufferID;
+    if (ibuffer) {
+        ibufferID = ibuffer->bufferID();
+        ibufferIDPtr = &ibufferID;
+    }
+    return this->internalBind(gpu, vbufferID, ibufferIDPtr);
+}
+
+GrGLAttribArrayState* GrGLGpu::HWGeometryState::bindArrayAndBufferToDraw(GrGLGpu* gpu,
+                                                                         GrGLuint vbufferID) {
+    return this->internalBind(gpu, vbufferID, nullptr);
+}
+
+GrGLAttribArrayState* GrGLGpu::HWGeometryState::bindArrayAndBuffersToDraw(GrGLGpu* gpu,
+                                                                          GrGLuint vbufferID,
+                                                                          GrGLuint ibufferID) {
+    return this->internalBind(gpu, vbufferID, &ibufferID);
+}
+
+GrGLAttribArrayState* GrGLGpu::HWGeometryState::internalBind(GrGLGpu* gpu,
+                                                             GrGLuint vbufferID,
+                                                             GrGLuint* ibufferID) {
+    GrGLAttribArrayState* attribState;
+
+    if (gpu->glCaps().isCoreProfile() && 0 != vbufferID) {
+        if (!fVBOVertexArray) {
+            GrGLuint arrayID;
+            GR_GL_CALL(gpu->glInterface(), GenVertexArrays(1, &arrayID));
+            int attrCount = gpu->glCaps().maxVertexAttributes();
+            fVBOVertexArray = new GrGLVertexArray(arrayID, attrCount);
+        }
+        if (ibufferID) {
+            attribState = fVBOVertexArray->bindWithIndexBuffer(gpu, *ibufferID);
+        } else {
+            attribState = fVBOVertexArray->bind(gpu);
+        }
+    } else {
+        if (ibufferID) {
+            this->setIndexBufferIDOnDefaultVertexArray(gpu, *ibufferID);
+        } else {
+            this->setVertexArrayID(gpu, 0);
+        }
+        int attrCount = gpu->glCaps().maxVertexAttributes();
+        if (fDefaultVertexArrayAttribState.count() != attrCount) {
+            fDefaultVertexArrayAttribState.resize(attrCount);
+        }
+        attribState = &fDefaultVertexArrayAttribState;
+    }
+    return attribState;
+}