Add option to draw wireframe batch bounds

src/gpu/gl/GrGLGpu.cpp

 /*
  * 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"
@@ skipping 214 matching lines @@
         fPixelConfigToStencilIndex[i] = kUnknownStencilIndex;
     }
     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) {
@@ skipping 2720 matching lines @@
         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(";");
     
@@ skipping 75 matching lines @@
         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->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()) {
@@ skipping 267 matching lines @@
             this->setVertexArrayID(gpu, 0);
         }
         int attrCount = gpu->glCaps().maxVertexAttributes();
         if (fDefaultVertexArrayAttribState.count() != attrCount) {
             fDefaultVertexArrayAttribState.resize(attrCount);
         }
         attribState = &fDefaultVertexArrayAttribState;
     }
     return attribState;
 }