Creating functions for uploading a mipmapped texture.

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 8033ea60e5590de4efd3236c06048bb181435183..b8b21b60a4e37c0c98218df2fc1d06863e4c9622 100644
--- a/src/gpu/gl/GrGLGpu.cpp
+++ b/src/gpu/gl/GrGLGpu.cpp
@@ -22,6 +22,7 @@
 #include "glsl/GrGLSLCaps.h"
 #include "SkStrokeRec.h"
 #include "SkTemplates.h"
+#include "SkTypes.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)
@@ -38,6 +39,12 @@
     #define CHECK_ALLOC_ERROR(iface)          GR_GL_NO_ERROR
 #endif
 
+#if defined(GOOGLE3)
+    // Stack frame size is limited in GOOGLE3.
+    typedef SkAutoSMalloc<64 * 128> SkAutoSMallocTexels;
+#else
+    typedef SkAutoSMalloc<128 * 128> SkAutoSMallocTexels;
+#endif
 
 ///////////////////////////////////////////////////////////////////////////////
 
@@ -465,7 +472,7 @@ GrTexture* GrGLGpu::onWrapBackendTexture(const GrBackendTextureDesc& desc,
         case kBorrow_GrWrapOwnership:
             idDesc.fLifeCycle = GrGpuResource::kBorrowed_LifeCycle;
             break;
-    }    
+    }
 
     surfDesc.fFlags = (GrSurfaceFlags) desc.fFlags;
     surfDesc.fWidth = desc.fWidth;
@@ -513,7 +520,7 @@ GrRenderTarget* GrGLGpu::onWrapBackendRenderTarget(const GrBackendRenderTargetDe
         case kBorrow_GrWrapOwnership:
             idDesc.fLifeCycle = GrGpuResource::kBorrowed_LifeCycle;
             break;
-    }    
+    }
     idDesc.fSampleConfig = GrRenderTarget::kUnified_SampleConfig;
 
     GrSurfaceDesc desc;
@@ -529,7 +536,7 @@ GrRenderTarget* GrGLGpu::onWrapBackendRenderTarget(const GrBackendRenderTargetDe
 
 ////////////////////////////////////////////////////////////////////////////////
 bool GrGLGpu::onGetWritePixelsInfo(GrSurface* dstSurface, int width, int height,
-                                   size_t rowBytes, GrPixelConfig srcConfig,
+                                   GrPixelConfig srcConfig,
                                    DrawPreference* drawPreference,
                                    WritePixelTempDrawInfo* tempDrawInfo) {
     if (kIndex_8_GrPixelConfig == srcConfig || GrPixelConfigIsCompressed(dstSurface->config())) {
@@ -614,8 +621,8 @@ static bool check_write_and_transfer_input(GrGLTexture* glTex, GrSurface* surfac
 
 bool GrGLGpu::onWritePixels(GrSurface* surface,
                             int left, int top, int width, int height,
-                            GrPixelConfig config, const void* buffer,
-                            size_t rowBytes) {
+                            GrPixelConfig config,
+                            const SkTArray<SkMipMapLevel>& texels) {
     GrGLTexture* glTex = static_cast<GrGLTexture*>(surface->asTexture());
 
     if (!check_write_and_transfer_input(glTex, surface, config)) {
@@ -629,19 +636,14 @@ bool GrGLGpu::onWritePixels(GrSurface* surface,
     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, 
+        success = this->uploadCompressedTexData(glTex->desc(), glTex->target(), texels,
                                                 kWrite_UploadType, left, top, width, height);
     } else {
         success = this->uploadTexData(glTex->desc(), glTex->target(), kWrite_UploadType,
-                                      left, top, width, height, config, buffer, rowBytes);
-    }
-
-    if (success) {
-        glTex->texturePriv().dirtyMipMaps(true);
-        return true;
+                                      left, top, width, height, config, texels);
     }
 
-    return false;
+    return success;
 }
 
 bool GrGLGpu::onTransferPixels(GrSurface* surface,
@@ -670,8 +672,11 @@ bool GrGLGpu::onTransferPixels(GrSurface* surface,
     GL_CALL(BindBuffer(glBuffer->bufferType(), glBuffer->bufferID()));
 
     bool success = false;
+    SkMipMapLevel mipLevel(buffer, rowBytes, width, height);
+    SkSTArray<1, SkMipMapLevel> texels;
+    texels.push_back(mipLevel);
     success = this->uploadTexData(glTex->desc(), glTex->target(), kTransfer_UploadType,
-                                  left, top, width, height, config, buffer, rowBytes);
+                                  left, top, width, height, config, texels);
 
     if (success) {
         glTex->texturePriv().dirtyMipMaps(true);
@@ -711,35 +716,164 @@ static inline GrGLenum check_alloc_error(const GrSurfaceDesc& desc,
     }
 }
 
+/**
+ * Creates storage space for the texture and fills it with texels.
+ *
+ * @param desc           The surface descriptor for the texture being created.
+ * @param interface      The GL interface in use.
+ * @param useTexStorage  The result of a call to can_use_tex_storage().
+ * @param internalFormat The data format used for the internal storage of the texture.
+ * @param externalFormat The data format used for the external storage of the texture.
+ * @param externalType   The type of the data used for the external storage of the texture.
+ * @param texels         The texel data of the texture being created.
+ * @param succeeded      Set to true if allocating and populating the texture completed
+ *                       without error.
+ */
+static void allocate_and_populate_uncompressed_texture(const GrSurfaceDesc& desc,
+                                                       const GrGLInterface& interface,
+                                                       GrGLenum target,
+                                                       GrGLenum internalFormat,
+                                                       GrGLenum externalFormat,
+                                                       GrGLenum externalType,
+                                                       const SkTArray<SkMipMapLevel>& texels,
+                                                       bool* succeeded) {
+    CLEAR_ERROR_BEFORE_ALLOC(&interface);
+    *succeeded = true;
+    for (int currentMipLevel = 0; currentMipLevel < texels.count(); currentMipLevel++) {
+        const void* currentMipData = texels[currentMipLevel].fTexelsOrOffset;
+        // Even if curremtMipData is nullptr, continue to call TexImage2D.
+        // This will allocate texture memory which we can later populate.
+        GL_ALLOC_CALL(&interface,
+                      TexImage2D(target,
+                                 currentMipLevel,
+                                 internalFormat,
+                                 texels[currentMipLevel].fWidth,
+                                 texels[currentMipLevel].fHeight,
+                                 0, // border
+                                 externalFormat, externalType,
+                                 currentMipData));
+        GrGLenum error = check_alloc_error(desc, &interface);
+        if (error != GR_GL_NO_ERROR) {
+            *succeeded = false;
+            break;
+        }
+    }
+}
+
+/**
+ * Creates storage space for the texture and fills it with texels.
+ *
+ * @param desc           The surface descriptor for the texture being created.
+ * @param interface      The GL interface in use.
+ * @param useTexStorage  The result of a call to can_use_tex_storage().
+ * @param internalFormat The data format used for the internal storage of the texture.
+ * @param texels         The texel data of the texture being created.
+ */
+static bool allocate_and_populate_compressed_texture(const GrSurfaceDesc& desc,
+                                                     const GrGLInterface& interface,
+                                                     GrGLenum target, GrGLenum internalFormat,
+                                                     const SkTArray<SkMipMapLevel>& texels) {
+    CLEAR_ERROR_BEFORE_ALLOC(&interface);
+    for (int currentMipLevel = 0; currentMipLevel < texels.count(); currentMipLevel++) {
+        int width = texels[currentMipLevel].fWidth;
+        int height = texels[currentMipLevel].fHeight;
+
+        // 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);
+
+        GL_ALLOC_CALL(&interface,
+                      CompressedTexImage2D(target,
+                                           currentMipLevel,
+                                           internalFormat,
+                                           width,
+                                           height,
+                                           0, // border
+                                           SkToInt(dataSize),
+                                           texels[currentMipLevel].fTexelsOrOffset));
+
+        GrGLenum error = check_alloc_error(desc, &interface);
+        if (error != GR_GL_NO_ERROR) {
+            return false;
+        }
+    }
+
+    return true;
+}
+
+/**
+ * After a texture is created, any state which was altered during its creation
+ * needs to be restored.
+ *
+ * @param interface          The GL interface to use.
+ * @param caps               The capabilities of the GL device.
+ * @param restoreGLRowLength Should the row length unpacking be restored?
+ * @param glFlipY            Did GL flip the texture vertically?
+ */
+static void restore_pixelstore_state(const GrGLInterface& interface, const GrGLCaps& caps,
+                                     bool restoreGLRowLength, bool glFlipY) {
+    if (restoreGLRowLength) {
+        SkASSERT(caps.unpackRowLengthSupport());
+        GR_GL_CALL(&interface, PixelStorei(GR_GL_UNPACK_ROW_LENGTH, 0));
+    }
+    if (glFlipY) {
+        GR_GL_CALL(&interface, PixelStorei(GR_GL_UNPACK_FLIP_Y, GR_GL_FALSE));
+    }
+}
+
 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);
-
+                            const SkTArray<SkMipMapLevel>& texels) {
     // 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;
+    // texels is const.
+    // But we may need to flip the texture vertically to prepare it.
+    // Rather than flip in place and alter the incoming data,
+    // we allocate a new buffer to flip into.
+    // This means we need to make a non-const shallow copy of texels.
+    SkTArray<SkMipMapLevel> texelsShallowCopy(texels);
+
+    for (int currentMipLevel = texelsShallowCopy.count() - 1; currentMipLevel >= 0;
+         currentMipLevel--) {
+        SkASSERT(texelsShallowCopy[currentMipLevel].fTexelsOrOffset ||
+                 kNewTexture_UploadType == uploadType || kTransfer_UploadType == uploadType);
     }
-    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
+
+    const GrGLInterface* interface = this->glInterface();
+    const GrGLCaps& caps = this->glCaps();
+
+    size_t bpp = GrBytesPerPixel(dataConfig);
+    for (int currentMipLevel = 0; currentMipLevel < texelsShallowCopy.count(); currentMipLevel++) {
+        if (texelsShallowCopy[currentMipLevel].fTexelsOrOffset == nullptr) {
+            continue;
+        }
+
+        if (texelsShallowCopy[currentMipLevel].fHeight > SK_MaxS32 ||
+            texelsShallowCopy[currentMipLevel].fWidth > SK_MaxS32) {
+            return false;
+        }
+        int currentMipHeight = texelsShallowCopy[currentMipLevel].fHeight;
+        int currentMipWidth = texelsShallowCopy[currentMipLevel].fWidth;
+        if (!GrSurfacePriv::AdjustWritePixelParams(desc.fWidth, desc.fHeight, bpp, &left, &top,
+                                               &currentMipWidth,
+                                               &currentMipHeight,
+                                               &texelsShallowCopy[currentMipLevel].fTexelsOrOffset,
+                                               &texelsShallowCopy[currentMipLevel].fRowBytes)) {
+            return false;
+        }
+        if (currentMipWidth < 0 || currentMipHeight < 0) {
+            return false;
+        }
+        texelsShallowCopy[currentMipLevel].fWidth = currentMipWidth;
+        texelsShallowCopy[currentMipLevel].fHeight = currentMipHeight;
+    }
 
     // Internal format comes from the texture desc.
     GrGLenum internalFormat;
@@ -759,30 +893,62 @@ bool GrGLGpu::uploadTexData(const GrSurfaceDesc& desc,
     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 (kBottomLeft_GrSurfaceOrigin == desc.fOrigin) {
+        if (caps.unpackFlipYSupport()) {
+            glFlipY = true;
+        } else {
+            swFlipY = true;
         }
-        if (this->glCaps().unpackRowLengthSupport() && !swFlipY) {
+    }
+
+    // in case we need a temporary, trimmed copy of the src pixels
+    SkAutoSMallocTexels tempStorage;
+
+    // find the combined size of all the mip levels and the relative offset of
+    // each into the collective buffer
+    size_t combined_buffer_size = 0;
+    SkTArray<size_t> individual_mip_offsets(texelsShallowCopy.count());
+    for (int currentMipLevel = 0; currentMipLevel < texelsShallowCopy.count(); currentMipLevel++) {
+        const size_t trimmedSize = texels[currentMipLevel].fWidth * bpp *
+            texelsShallowCopy[currentMipLevel].fHeight;
+        individual_mip_offsets.push_back(combined_buffer_size);
+        combined_buffer_size += trimmedSize;
+    }
+    char* buffer = (char*)tempStorage.reset(combined_buffer_size);
+
+    for (int currentMipLevel = 0; currentMipLevel < texelsShallowCopy.count(); currentMipLevel++) {
+        if (texelsShallowCopy[currentMipLevel].fTexelsOrOffset == nullptr) {
+            continue;
+        }
+
+        const size_t trimRowBytes = texelsShallowCopy[currentMipLevel].fWidth * bpp;
+
+        /*
+         *  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.
+         */
+        restoreGLRowLength = false;
+
+        const size_t rowBytes = texelsShallowCopy[currentMipLevel].fRowBytes;
+        if (caps.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));
+                GR_GL_CALL(interface, PixelStorei(GR_GL_UNPACK_ROW_LENGTH, rowLength));
                 restoreGLRowLength = true;
             }
         } else if (kTransfer_UploadType != uploadType) {
             if (trimRowBytes != rowBytes || swFlipY) {
+                const int height = texelsShallowCopy[currentMipLevel].fHeight;
                 // copy data into our new storage, skipping the trailing bytes
-                size_t trimSize = height * trimRowBytes;
-                const char* src = (const char*)dataOrOffset;
-                if (swFlipY) {
+                const char* src = (const char*)texelsShallowCopy[currentMipLevel].fTexelsOrOffset;
+                if (swFlipY && height >= 1) {
                     src += (height - 1) * rowBytes;
                 }
-                char* dst = (char*)tempStorage.reset(trimSize);
+                char* dst = buffer + individual_mip_offsets[currentMipLevel];
                 for (int y = 0; y < height; y++) {
                     memcpy(dst, src, trimRowBytes);
                     if (swFlipY) {
@@ -793,49 +959,51 @@ bool GrGLGpu::uploadTexData(const GrSurfaceDesc& desc,
                     dst += trimRowBytes;
                 }
                 // now point data to our copied version
-                dataOrOffset = tempStorage.get();
+                texelsShallowCopy[currentMipLevel] =
+                    SkMipMapLevel(buffer + individual_mip_offsets[currentMipLevel],
+                                  trimRowBytes,
+                                  texelsShallowCopy[currentMipLevel].fWidth,
+                                  texelsShallowCopy[currentMipLevel].fHeight);
             }
         } else {
             return false;
         }
         if (glFlipY) {
-            GL_CALL(PixelStorei(GR_GL_UNPACK_FLIP_Y, GR_GL_TRUE));
+            GR_GL_CALL(interface, PixelStorei(GR_GL_UNPACK_FLIP_Y, GR_GL_TRUE));
         }
-        GL_CALL(PixelStorei(GR_GL_UNPACK_ALIGNMENT, config_alignment(dataConfig)));
+        GR_GL_CALL(interface, PixelStorei(GR_GL_UNPACK_ALIGNMENT,
+                                          config_alignment(desc.fConfig)));
     }
+
     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;
-            }
-        }
+    if (kNewTexture_UploadType == uploadType &&
+        0 == left && 0 == top &&
+        desc.fWidth == width && desc.fHeight == height) {
+        allocate_and_populate_uncompressed_texture(desc, *interface, target, internalFormat,
+                                                   externalFormat, externalType, texelsShallowCopy,
+                                                   &succeeded);
     } else {
         if (swFlipY || glFlipY) {
             top = desc.fHeight - (top + height);
         }
-        GL_CALL(TexSubImage2D(target,
-                              0, // level
-                              left, top,
-                              width, height,
-                              externalFormat, externalType, dataOrOffset));
-    }
+        for (int currentMipLevel = 0; currentMipLevel < texelsShallowCopy.count();
+             currentMipLevel++) {
+            if (texelsShallowCopy[currentMipLevel].fTexelsOrOffset == nullptr) {
+                continue;
+            }
 
-    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));
+            GL_CALL(TexSubImage2D(target,
+                                  currentMipLevel,
+                                  left, top,
+                                  texelsShallowCopy[currentMipLevel].fWidth,
+                                  texelsShallowCopy[currentMipLevel].fHeight,
+                                  externalFormat, externalType,
+                                  texelsShallowCopy[currentMipLevel].fTexelsOrOffset));
+        }
     }
+
+    restore_pixelstore_state(*interface, caps, restoreGLRowLength, glFlipY);
+
     return succeeded;
 }
 
@@ -846,16 +1014,19 @@ bool GrGLGpu::uploadTexData(const GrSurfaceDesc& desc,
 // 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,
+                                      const SkTArray<SkMipMapLevel>& texels,
                                       UploadType uploadType,
                                       int left, int top, int width, int height) {
     SkASSERT(this->caps()->isConfigTexturable(desc.fConfig));
-    SkASSERT(kTransfer_UploadType != uploadType && 
-             (data || kNewTexture_UploadType != uploadType));
+    SkASSERT(kTransfer_UploadType != uploadType &&
+             (texels[0].fTexelsOrOffset || kNewTexture_UploadType != uploadType));
 
     // No support for software flip y, yet...
     SkASSERT(kBottomLeft_GrSurfaceOrigin != desc.fOrigin);
 
+    const GrGLInterface* interface = this->glInterface();
+    const GrGLCaps& caps = this->glCaps();
+
     if (-1 == width) {
         width = desc.fWidth;
     }
@@ -874,42 +1045,39 @@ bool GrGLGpu::uploadCompressedTexData(const GrSurfaceDesc& desc,
     }
 #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.
     GrGLenum internalFormat;
-    if (!this->glCaps().getCompressedTexImageFormats(desc.fConfig, &internalFormat)) {
+    if (!caps.getCompressedTexImageFormats(desc.fConfig, &internalFormat)) {
         return false;
     }
 
     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;
-        }
+        return allocate_and_populate_compressed_texture(desc, *interface, target, internalFormat,
+                                                        texels);
     } 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));
+        for (int currentMipLevel = 0; currentMipLevel < texels.count(); currentMipLevel++) {
+            if (texels[currentMipLevel].fTexelsOrOffset == nullptr) {
+                continue;
+            }
+
+            // 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,
+                                                         texels[currentMipLevel].fWidth,
+                                                         texels[currentMipLevel].fHeight);
+            GL_CALL(CompressedTexSubImage2D(target,
+                                            currentMipLevel,
+                                            left, top,
+                                            texels[currentMipLevel].fWidth,
+                                            texels[currentMipLevel].fHeight,
+                                            internalFormat,
+                                            dataSize,
+                                            texels[currentMipLevel].fTexelsOrOffset));
+        }
     }
 
     return true;
@@ -1073,9 +1241,47 @@ static size_t as_size_t(int x) {
 }
 #endif
 
+static GrGLTexture::IDDesc generate_gl_texture(const GrGLInterface* interface,
+                                               GrGpuResource::LifeCycle lifeCycle) {
+    GrGLTexture::IDDesc idDesc;
+    idDesc.fInfo.fID = 0;
+    GR_GL_CALL(interface, GenTextures(1, &idDesc.fInfo.fID));
+    idDesc.fLifeCycle = lifeCycle;
+    // We only support GL_TEXTURE_2D at the moment.
+    idDesc.fInfo.fTarget = GR_GL_TEXTURE_2D;
+    return idDesc;
+}
+
+static GrGLTexture::TexParams set_initial_texture_params(const GrGLInterface* interface,
+                                                         GrGLTexture::IDDesc idDesc) {
+    // 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;
+    GR_GL_CALL(interface, TexParameteri(idDesc.fInfo.fTarget,
+                                        GR_GL_TEXTURE_MAG_FILTER,
+                                        initialTexParams.fMagFilter));
+    GR_GL_CALL(interface, TexParameteri(idDesc.fInfo.fTarget,
+                                        GR_GL_TEXTURE_MIN_FILTER,
+                                        initialTexParams.fMinFilter));
+    GR_GL_CALL(interface, TexParameteri(idDesc.fInfo.fTarget,
+                                        GR_GL_TEXTURE_WRAP_S,
+                                        initialTexParams.fWrapS));
+    GR_GL_CALL(interface, TexParameteri(idDesc.fInfo.fTarget,
+                                        GR_GL_TEXTURE_WRAP_T,
+                                        initialTexParams.fWrapT));
+    return initialTexParams;
+}
+
 GrTexture* GrGLGpu::onCreateTexture(const GrSurfaceDesc& desc,
                                     GrGpuResource::LifeCycle lifeCycle,
-                                    const void* srcData, size_t rowBytes) {
+                                    const SkTArray<SkMipMapLevel>& texels) {
     // 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.");
@@ -1084,13 +1290,7 @@ GrTexture* GrGLGpu::onCreateTexture(const GrSurfaceDesc& desc,
 
     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;
-
+    GrGLTexture::IDDesc idDesc = generate_gl_texture(this->glInterface(), lifeCycle);
     if (!idDesc.fInfo.fID) {
         return return_null_texture();
     }
@@ -1105,31 +1305,12 @@ GrTexture* GrGLGpu::onCreateTexture(const GrSurfaceDesc& desc,
                               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));
+    GrGLTexture::TexParams initialTexParams = set_initial_texture_params(this->glInterface(),
+                                                                         idDesc);
+
     if (!this->uploadTexData(desc, idDesc.fInfo.fTarget, kNewTexture_UploadType, 0, 0,
                              desc.fWidth, desc.fHeight,
-                             desc.fConfig, srcData, rowBytes)) {
+                             desc.fConfig, texels)) {
         GL_CALL(DeleteTextures(1, &idDesc.fInfo.fID));
         return return_null_texture();
     }
@@ -1146,31 +1327,29 @@ GrTexture* GrGLGpu::onCreateTexture(const GrSurfaceDesc& desc,
         }
         tex = new GrGLTextureRenderTarget(this, desc, idDesc, rtIDDesc);
     } else {
-        tex = new GrGLTexture(this, desc, idDesc);
+        bool wasMipMapDataProvided = false;
+        if (texels.count() > 1) {
+            wasMipMapDataProvided = true;
+        }
+        tex = new GrGLTexture(this, desc, idDesc, wasMipMapDataProvided);
     }
     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);
+             glTexDesc.fInfo.fID, desc.fWidth, desc.fHeight, desc.fConfig);
 #endif
     return tex;
 }
 
 GrTexture* GrGLGpu::onCreateCompressedTexture(const GrSurfaceDesc& desc,
                                               GrGpuResource::LifeCycle lifeCycle,
-                                              const void* srcData) {
+                                              const SkTArray<SkMipMapLevel>& texels) {
     // 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;
-
+    GrGLTexture::IDDesc idDesc = generate_gl_texture(this->glInterface(), lifeCycle);
     if (!idDesc.fInfo.fID) {
         return return_null_texture();
     }
@@ -1178,30 +1357,10 @@ GrTexture* GrGLGpu::onCreateCompressedTexture(const GrSurfaceDesc& desc,
     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)) {
+    GrGLTexture::TexParams initialTexParams = set_initial_texture_params(this->glInterface(),
+                                                                         idDesc);
+
+    if (!this->uploadCompressedTexData(desc, idDesc.fInfo.fTarget, texels)) {
         GL_CALL(DeleteTextures(1, &idDesc.fInfo.fID));
         return return_null_texture();
     }
@@ -1211,7 +1370,7 @@ GrTexture* GrGLGpu::onCreateCompressedTexture(const GrSurfaceDesc& desc,
     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);
+             glTexDesc.fInfo.fID, desc.fWidth, desc.fHeight, desc.fConfig);
 #endif
     return tex;
 }
@@ -2561,10 +2720,21 @@ void GrGLGpu::bindTexture(int unitIdx, const GrTextureParams& params, GrGLTextur
     newTexParams.fMinFilter = glMinFilterModes[filterMode];
     newTexParams.fMagFilter = glMagFilterModes[filterMode];
 
-    if (GrTextureParams::kMipMap_FilterMode == filterMode &&
-        texture->texturePriv().mipMapsAreDirty()) {
-        GL_CALL(GenerateMipmap(target));
-        texture->texturePriv().dirtyMipMaps(false);
+    if (GrTextureParams::kMipMap_FilterMode == filterMode) {
+        if (texture->texturePriv().mipMapsAreDirty()) {
+            GL_CALL(GenerateMipmap(target));

[bsalomon, 2016/01/14 13:57:23]

Should we set the mip count here, if not already set? Seems like the texture now
has a known number of MIP levels same as if we explicitly uploaded them

[Chris Blume, 2016/01/20 06:15:08]

Done.

+            texture->texturePriv().dirtyMipMaps(false);
+        }
+        if (texture->texturePriv().hasMipMaps()) {
+            if (texture->texturePriv().isMaxMipMapLevelSpecified()) {
+                GL_CALL(TexParameteri(target, GR_GL_TEXTURE_MIN_LOD, 0));
+                GL_CALL(TexParameteri(target, GR_GL_TEXTURE_BASE_LEVEL, 0));
+                GL_CALL(TexParameteri(target, GR_GL_TEXTURE_MAX_LOD,
+                                      static_cast<float>(texture->texturePriv().maxMipMapLevel())));
+                GL_CALL(TexParameteri(target, GR_GL_TEXTURE_MAX_LEVEL,
+                                      texture->texturePriv().maxMipMapLevel()));
+            }
+        }
     }
 
     newTexParams.fWrapS = tile_to_gl_wrap(params.getTileModeX());
@@ -2770,7 +2940,7 @@ void GrGLGpu::bindSurfaceFBOForCopy(GrSurface* surface, GrGLenum fboTarget, GrGL
 }
 
 void GrGLGpu::unbindTextureFBOForCopy(GrGLenum fboTarget, GrSurface* surface) {
-    // bindSurfaceFBOForCopy temporarily binds textures that are not render targets to 
+    // bindSurfaceFBOForCopy temporarily binds textures that are not render targets to
     if (!surface->asRenderTarget()) {
         SkASSERT(surface->asTexture());
         GrGLenum textureTarget = static_cast<GrGLTexture*>(surface->asTexture())->target();
@@ -2854,7 +3024,7 @@ bool GrGLGpu::onCopySurface(GrSurface* dst,
         this->copySurfaceAsDraw(dst, src, srcRect, dstPoint);
         return true;
     }
-    
+
     if (can_copy_texsubimage(dst, src, this)) {
         this->copySurfaceAsCopyTexSubImage(dst, src, srcRect, dstPoint);
         return true;
@@ -2897,7 +3067,7 @@ void GrGLGpu::createCopyPrograms() {
         vshaderTxt.append(";");
         vTexCoord.appendDecl(this->glCaps().glslCaps(), &vshaderTxt);
         vshaderTxt.append(";");
-    
+
         vshaderTxt.append(
             "// Copy Program VS\n"
             "void main() {"
@@ -2936,7 +3106,7 @@ void GrGLGpu::createCopyPrograms() {
             fsOutName,
             GrGLSLTexture2DFunctionName(kVec2f_GrSLType, this->glslGeneration())
         );
-    
+
         GL_CALL_RET(fCopyPrograms[i].fProgram, CreateProgram());
         const char* str;
         GrGLint length;