Creating functions for uploading a mipmapped texture.

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 455 matching lines @@
 
     int maxSize = this->caps()->maxTextureSize();
     if (desc.fWidth > maxSize || desc.fHeight > maxSize) {
         return NULL;
     }
 
     GrGLTexture::IDDesc idDesc;
     GrSurfaceDesc surfDesc;
 
     idDesc.fTextureID = static_cast<GrGLuint>(desc.fTextureHandle);
-    
+
     switch (ownership) {
         case kAdopt_GrWrapOwnership:
             idDesc.fLifeCycle = GrGpuResource::kAdopted_LifeCycle;
             break;
         case kBorrow_GrWrapOwnership:
             idDesc.fLifeCycle = GrGpuResource::kBorrowed_LifeCycle;
             break;
-    }    
+    }
 
     // next line relies on GrBackendTextureDesc's flags matching GrTexture's
     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());
     bool renderTarget = SkToBool(desc.fFlags & kRenderTarget_GrBackendTextureFlag);
     // FIXME:  this should be calling resolve_origin(), but Chrome code is currently
     // assuming the old behaviour, which is that backend textures are always
@@ skipping 29 matching lines @@
     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;
     desc.fWidth = wrapDesc.fWidth;
     desc.fHeight = wrapDesc.fHeight;
     desc.fSampleCnt = SkTMin(wrapDesc.fSampleCnt, this->caps()->maxSampleCount());
     desc.fOrigin = resolve_origin(wrapDesc.fOrigin, true);
 
@@ skipping 15 matching lines @@
         tgt->renderTargetPriv().didAttachStencilAttachment(sb);
         sb->unref();
     }
     return tgt;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 
 bool GrGLGpu::onWriteTexturePixels(GrTexture* texture,
                                    int left, int top, int width, int height,
-                                   GrPixelConfig config, const void* buffer,
-                                   size_t rowBytes) {
-    if (NULL == buffer) {
+                                   GrPixelConfig config, SkTArray<SkMipMapLevel>& texels) {
+    if (texels.count() == 0) {
         return false;
     }
     GrGLTexture* glTex = static_cast<GrGLTexture*>(texture);
 
     this->setScratchTextureUnit();
     GL_CALL(BindTexture(GR_GL_TEXTURE_2D, 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(), buffer, false, left, top, width,
+        success = this->uploadCompressedTexData(glTex->desc(), texels, false, left, top, width,
                                                 height);
     } else {
         success = this->uploadTexData(glTex->desc(), false, left, top, width, height, config,
-                                      buffer, rowBytes);
+                                      texels);
     }
 
     if (success) {
         texture->texturePriv().dirtyMipMaps(true);
         return true;
     }
 
     return false;
 }
 
@@ skipping 25 matching lines @@
 
 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,
-                            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));
-
-    size_t bpp = GrBytesPerPixel(dataConfig);
-    if (!adjust_pixel_ops_params(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
-    SkAutoSMalloc<128 * 128> tempStorage;
-
-    // We currently lazily create MIPMAPs when the we see a draw with
-    // GrTextureParams::kMipMap_FilterMode. Using texture storage requires that the
-    // MIP levels are all created when the texture is created. So for now we don't use
-    // texture storage.
-    bool useTexStorage = false &&
-                         isNewTexture &&
-                         this->glCaps().texStorageSupport();
-
-    if (useTexStorage && kGL_GrGLStandard == this->glStandard()) {
+/**
+ * Determines if TexStorage can be used when creating a texture.
+ *
+ * @param caps     The capabilities of the GL device.
+ * @param standard The GL standard in use.
+ * @param desc     The surface descriptor for the texture being created.
+ */
+static bool can_use_tex_storage(const GrGLCaps& caps, const GrGLStandard& standard,
+                                const GrSurfaceDesc& desc) {
+    bool useTexStorage = caps.texStorageSupport();
+    if (useTexStorage && kGL_GrGLStandard == standard) {
         // 565 is not a sized internal format on desktop GL. So on desktop with
         // 565 we always use an unsized internal format to let the system pick
         // the best sized format to convert the 565 data to. Since TexStorage
         // only allows sized internal formats we will instead use TexImage2D.
         useTexStorage = desc.fConfig != kRGB_565_GrPixelConfig;
     }
 
-    GrGLenum internalFormat = 0x0; // suppress warning
-    GrGLenum externalFormat = 0x0; // suppress warning
-    GrGLenum externalType = 0x0;   // suppress warning
+    return useTexStorage;
+}
 
+/**
+ * Determines if sized internal formats are available for the texture being created.
+ *
+ * @param useTexStorage The result of a call to can_use_tex_storage().
+ * @param caps          The capabilities of the GL device.
+ * @param standard      The GL standard in use.
+ * @param version       The GL version in use.
+ * @param dataConfig    The pixel configuration for the texture being created.
+ */
+static bool can_use_sized_format(bool useTexStorage, const GrGLCaps& caps,
+                                 const GrGLStandard& standard, const GrGLVersion& version,
+                                 GrPixelConfig dataConfig) {
     // glTexStorage requires sized internal formats on both desktop and ES. ES2 requires an unsized
     // format for glTexImage, unlike ES3 and desktop.
     bool useSizedFormat = useTexStorage;
-    if (kGL_GrGLStandard == this->glStandard() ||
-        (this->glVersion() >= GR_GL_VER(3, 0) &&
+    if (kGL_GrGLStandard == standard ||
+        (version >= GR_GL_VER(3, 0) &&
          // ES3 only works with sized BGRA8 format if "GL_APPLE_texture_format_BGRA8888" enabled
-         (kBGRA_8888_GrPixelConfig != dataConfig || !this->glCaps().bgraIsInternalFormat())))  {
+         (kBGRA_8888_GrPixelConfig != dataConfig || !caps.bgraIsInternalFormat()))) {
         useSizedFormat = true;
     }
 
-    if (!this->configToGLFormats(dataConfig, useSizedFormat, &internalFormat,
-                                 &externalFormat, &externalType)) {
-        return false;
-    }
+    return useSizedFormat;
+}
 
-    /*
-     *  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) {
+/**
+ * Prior to a texture being created, the image may need to be flipped vertically. This function
+ * prepares the texels for texture creation.
+ *
+ * @param desc               The surface descriptor for the texture being created.
+ * @param caps               The capabilities of the GL device.
+ * @param interface          The GL interface in use.
+ * @param swFlipY            Should software be used when flipping a texture vertically?
+ * @param glFlipY            Should GL be used when flipping a texture vertically?
+ * @param width              The width of the texture in texels.
+ * @param height             The height of the texture in texels.
+ * @param bpp                The bits per pixel (or texel, really) of the texture.
+ * @param rowBytes           The number of bytes between consecutive rows. Zero means rows are
+ *                           tightly packed.
+ * @param data               The texel data of the texture being created.
+ * @param tempStorage        In the case where the image needs to be flipped vertically, it will use
+ *                           tempStorage as a buffer.
+ * @param restoreGLRowLength After the texture is created, will the GL row length unpacking need to
+ *                           be restored?
+ */
+static void prepare_image_for_writing_to_texture(const GrSurfaceDesc& desc, const GrGLCaps& caps,
+                                                 const GrGLInterface& interface, bool swFlipY,
+                                                 bool glFlipY, int width, int height, int bpp,
+                                                 SkTArray<SkMipMapLevel>& texels,
+                                                 SkAutoSMalloc<128 * 128>& tempStorage,
+                                                 bool* restoreGLRowLength) {
+    int currentMipLevelWidth = width;
+    for(int currentMipLevel = 0; currentMipLevel < texels.count(); currentMipLevel++) {
+        size_t trimRowBytes = currentMipLevelWidth * 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;
+
+        auto rowBytes = texels[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));
-                restoreGLRowLength = true;
+                GR_GL_CALL(&interface, 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;
+                const char* src = (const char*)texels[currentMipLevel].fTexels;
                 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();
+                texels[currentMipLevel] = SkMipMapLevel(tempStorage.get(), trimRowBytes);
             }
         }
         if (glFlipY) {
-            GL_CALL(PixelStorei(GR_GL_UNPACK_FLIP_Y, GR_GL_TRUE));
-        }
-        GL_CALL(PixelStorei(GR_GL_UNPACK_ALIGNMENT,
-              static_cast<GrGLint>(GrUnpackAlignment(dataConfig))));
-    }
+            GR_GL_CALL(&interface, PixelStorei(GR_GL_UNPACK_FLIP_Y, GR_GL_TRUE));
+        }
+        GR_GL_CALL(&interface, PixelStorei(GR_GL_UNPACK_ALIGNMENT,
+                                           static_cast<GrGLint>(GrUnpackAlignment(desc.fConfig))));
+        currentMipLevelWidth /= 2;
+    }
+}
+
+/**
+ * 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,
+                                                       bool useTexStorage,
+                                                       GrGLenum internalFormat,
+                                                       GrGLenum externalFormat,
+                                                       GrGLenum externalType,
+                                                       const SkTArray<SkMipMapLevel>& texels,
+                                                       bool* succeeded) {
+    CLEAR_ERROR_BEFORE_ALLOC(&interface);
+    if (useTexStorage) {
+        // We never resize or change formats of textures.
+        GL_ALLOC_CALL(&interface,
+                      TexStorage2D(GR_GL_TEXTURE_2D,
+                                   texels.count(),
+                                   internalFormat,
+                                   desc.fWidth, desc.fHeight));
+    } else {
+        int width = desc.fWidth;
+        int height = desc.fHeight;
+        for (int currentMipLevel = 0; currentMipLevel < texels.count(); currentMipLevel++) {
+            auto currentMipData = texels[currentMipLevel].fTexels;
+            GL_ALLOC_CALL(&interface,
+                          TexImage2D(GR_GL_TEXTURE_2D,
+                                     currentMipLevel,
+                                     internalFormat,
+                                     width, height,
+                                     0, // border
+                                     externalFormat, externalType,
+                                     currentMipData));
+            width /= 2;
+            height /= 2;
+        }
+    }
+
+    GrGLenum error = check_alloc_error(desc, &interface);
+    if (error != GR_GL_NO_ERROR) {
+        *succeeded = false;
+    } else {
+        int width = desc.fWidth;
+        int height = desc.fHeight;
+        for (int currentMipLevel = texels.count(); currentMipLevel != 0; currentMipLevel--) {
+            auto currentMipData = texels[currentMipLevel].fTexels;
+            GR_GL_CALL(&interface,
+                       TexSubImage2D(GR_GL_TEXTURE_2D,
+                                     currentMipLevel,
+                                     0, // left
+                                     0, // top
+                                     width, height,
+                                     externalFormat, externalType,
+                                     currentMipData));
+            width /= 2;
+            height /= 2;
+        }
+        *succeeded = true;
+    }
+}
+
+/**
+ * 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 data           The texel data of the texture being created.
+ */
+static bool allocate_and_populate_compressed_texture(const GrSurfaceDesc& desc,
+                                                     const GrGLInterface& interface,
+                                                     bool useTexStorage, GrGLenum internalFormat,
+                                                     const SkTArray<SkMipMapLevel>& texels) {
+    CLEAR_ERROR_BEFORE_ALLOC(&interface);
+    if (useTexStorage) {
+        // We never resize or change formats of textures.
+        GL_ALLOC_CALL(&interface,
+                      TexStorage2D(GR_GL_TEXTURE_2D,
+                                   texels.count(),
+                                   internalFormat,
+                                   desc.fWidth, desc.fHeight));
+    } else {
+        int width = desc.fWidth;
+        int height = desc.fHeight;
+        for (int currentMipLevel = texels.count(); currentMipLevel != 0; currentMipLevel--) {
+            auto currentMipData = texels[currentMipLevel].fTexels;
+
+            // 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);
+
+            GR_GL_CALL(&interface,
+                       CompressedTexImage2D(GR_GL_TEXTURE_2D,
+                                            texels.count(),
+                                            internalFormat,
+                                            width, height,
+                                            0, // border
+                                            SkToInt(dataSize),
+                                            currentMipData));
+            width /= 2;
+            height /= 2;
+        }
+    }
+
+    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_gl_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,
+                            bool isNewTexture,
+                            int left, int top, int width, int height,
+                            GrPixelConfig dataConfig,
+                            SkTArray<SkMipMapLevel>& texels) {
+    SkASSERT(isNewTexture);
+
+    // If we're uploading compressed data then we should be using uploadCompressedTexData
+    SkASSERT(!GrPixelConfigIsCompressed(dataConfig));
+
+    auto interface = this->glInterface();
+    if (interface == nullptr) {
+        return false;
+    }
+    auto& caps = this->glCaps();
+    auto standard = this->glStandard();
+    auto version = this->glVersion();
+
+    size_t bpp = GrBytesPerPixel(dataConfig);
+    int mipWidth = desc.fWidth;
+    int mipHeight = desc.fHeight;
+    for (int currentMipLevel = texels.count(); currentMipLevel != 0; currentMipLevel--) {
+        if (!adjust_pixel_ops_params(desc.fWidth, desc.fHeight, bpp, &left, &top,
+                                     &mipWidth, &mipHeight, &texels[currentMipLevel].fTexels,
+                                     &texels[currentMipLevel].fRowBytes)) {
+            return false;
+        }
+    }
+
+    bool useTexStorage = can_use_tex_storage(caps, standard, desc);
+    bool useSizedFormat = can_use_sized_format(useTexStorage, caps, standard, version, dataConfig);
+
+    GrGLenum internalFormat = 0x0; // suppress warning
+    GrGLenum externalFormat = 0x0; // suppress warning
+    GrGLenum externalType = 0x0;   // suppress warning
+
+    if (!this->configToGLFormats(dataConfig, useSizedFormat, &internalFormat,
+                                 &externalFormat, &externalType)) {
+        return false;
+    }
+
+    bool swFlipY = false;
+    bool glFlipY = false;
+
+    if (kBottomLeft_GrSurfaceOrigin == desc.fOrigin) {
+        if (caps.unpackFlipYSupport()) {
+            glFlipY = true;
+        } else {
+            swFlipY = true;
+        }
+    }
+
+    bool restoreGLRowLength = false;
+
+    // in case we need a temporary, trimmed copy of the src pixels
+    SkAutoSMalloc<128 * 128> tempStorage;
+    prepare_image_for_writing_to_texture(desc, caps, *interface, swFlipY, glFlipY, width,
+                                         height, bpp, texels, tempStorage, &restoreGLRowLength);
     bool succeeded = true;
     if (isNewTexture &&
         0 == left && 0 == top &&
         desc.fWidth == width && desc.fHeight == height) {
-        CLEAR_ERROR_BEFORE_ALLOC(this->glInterface());
-        if (useTexStorage) {
-            // We never resize  or change formats of textures.
-            GL_ALLOC_CALL(this->glInterface(),
-                          TexStorage2D(GR_GL_TEXTURE_2D,
-                                       1, // levels
-                                       internalFormat,
-                                       desc.fWidth, desc.fHeight));
-        } else {
-            GL_ALLOC_CALL(this->glInterface(),
-                          TexImage2D(GR_GL_TEXTURE_2D,
-                                     0, // level
-                                     internalFormat,
-                                     desc.fWidth, desc.fHeight,
-                                     0, // border
-                                     externalFormat, externalType,
-                                     data));
-        }
-        GrGLenum error = check_alloc_error(desc, this->glInterface());
-        if (error != GR_GL_NO_ERROR) {
-            succeeded = false;
-        } else {
-            // if we have data and we used TexStorage to create the texture, we
-            // now upload with TexSubImage.
-            if (data && useTexStorage) {
-                GL_CALL(TexSubImage2D(GR_GL_TEXTURE_2D,
-                                      0, // level
-                                      left, top,
-                                      width, height,
-                                      externalFormat, externalType,
-                                      data));
-            }
-        }
+        allocate_and_populate_uncompressed_texture(desc, *interface, useTexStorage, internalFormat,
+                                                   externalFormat, externalType, texels,
+                                                   &succeeded);
     } else {
         if (swFlipY || glFlipY) {
             top = desc.fHeight - (top + height);
         }
-        GL_CALL(TexSubImage2D(GR_GL_TEXTURE_2D,
-                              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));
-    }
+        width = desc.fWidth;
+        height = desc.fHeight;
+        for (int currentMipLevel = 0; currentMipLevel < texels.count(); currentMipLevel++) {
+            GL_CALL(TexSubImage2D(GR_GL_TEXTURE_2D,
+                                  0, // level
+                                  left, top,
+                                  width, height,
+                                  externalFormat, externalType, texels[currentMipLevel].fTexels));
+            width /= 2;
+            height /= 2;
+        }
+    }
+
+    restore_gl_state(*interface, caps, restoreGLRowLength, glFlipY);
+
     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,
-                                      const void* data,
+                                      const SkTArray<SkMipMapLevel>& texels,
                                       bool isNewTexture,
                                       int left, int top, int width, int height) {
-    SkASSERT(data || isNewTexture);
+    SkASSERT(isNewTexture);
 
     // No support for software flip y, yet...
     SkASSERT(kBottomLeft_GrSurfaceOrigin != desc.fOrigin);
 
+    auto interface = this->glInterface();
+    if (interface == nullptr) {
+        return false;
+    }
+    auto& caps = this->glCaps();
+    auto standard = this->glStandard();
+
     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);
+    bool useTexStorage = can_use_tex_storage(caps, standard, desc);
 
     // We only need the internal format for compressed 2D textures.
     GrGLenum internalFormat = 0;
     if (!this->configToGLFormats(desc.fConfig, false, &internalFormat, NULL, NULL)) {
         return false;
     }
 
     if (isNewTexture) {
-        CLEAR_ERROR_BEFORE_ALLOC(this->glInterface());
-        GL_ALLOC_CALL(this->glInterface(),
-                      CompressedTexImage2D(GR_GL_TEXTURE_2D,
-                                           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, useTexStorage,
+                                                        internalFormat, texels);
     } else {
         // Paletted textures can't be updated.
         if (GR_GL_PALETTE8_RGBA8 == internalFormat) {
             return false;
         }
-        GL_CALL(CompressedTexSubImage2D(GR_GL_TEXTURE_2D,
-                                        0, // level
-                                        left, top,
-                                        width, height,
-                                        internalFormat,
-                                        SkToInt(dataSize),
-                                        data));
+        int currentMipWidth = width;
+        int currentMipHeight = height;
+        for(int currentMipLevel = 0; currentMipLevel < texels.count(); currentMipLevel++) {
+            // 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, currentMipWidth, currentMipHeight);
+            GL_CALL(CompressedTexSubImage2D(GR_GL_TEXTURE_2D,
+                                            currentMipLevel,
+                                            left, top,
+                                            currentMipWidth, currentMipHeight,
+                                            internalFormat,
+                                            dataSize,
+                                            texels[currentMipLevel].fTexels));
+            currentMipWidth /= 2;
+            currentMipHeight /= 2;
+        }
     }
 
     return true;
 }
 
 static bool renderbuffer_storage_msaa(const GrGLContext& ctx,
                                       int sampleCount,
                                       GrGLenum format,
                                       int width, int height) {
     CLEAR_ERROR_BEFORE_ALLOC(ctx.interface());
@@ skipping 85 matching lines @@
         GL_CALL(BindRenderbuffer(GR_GL_RENDERBUFFER, idDesc->fMSColorRenderbufferID));
         if (!renderbuffer_storage_msaa(*fGLContext,
                                        desc.fSampleCnt,
                                        msColorFormat,
                                        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));
+                                        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();
@@ skipping 39 matching lines @@
 //    SkDEBUGFAIL("null texture");
     return NULL;
 }
 
 #if 0 && defined(SK_DEBUG)
 static size_t as_size_t(int x) {
     return x;
 }
 #endif
 
+static GrGLTexture::IDDesc generate_and_bind_gl_texture(const GrGLInterface* interface,
+                                                        GrGpuResource::LifeCycle lifeCycle) {
+    GrGLTexture::IDDesc idDesc;
+    GR_GL_CALL(interface, GenTextures(1, &idDesc.fTextureID));
+    idDesc.fLifeCycle = lifeCycle;
+    return idDesc;
+}
+
+static GrGLTexture::TexParams set_initial_texture_params(const GrGLInterface* interface) {
+    // 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(GR_GL_TEXTURE_2D,
+                                        GR_GL_TEXTURE_MAG_FILTER,
+                                        initialTexParams.fMagFilter));
+    GR_GL_CALL(interface, TexParameteri(GR_GL_TEXTURE_2D,
+                                        GR_GL_TEXTURE_MIN_FILTER,
+                                        initialTexParams.fMinFilter));
+    GR_GL_CALL(interface, TexParameteri(GR_GL_TEXTURE_2D,
+                                        GR_GL_TEXTURE_WRAP_S,
+                                        initialTexParams.fWrapS));
+    GR_GL_CALL(interface, TexParameteri(GR_GL_TEXTURE_2D,
+                                        GR_GL_TEXTURE_WRAP_T,
+                                        initialTexParams.fWrapT));
+    return initialTexParams;
+}
+
 GrTexture* GrGLGpu::onCreateTexture(const GrSurfaceDesc& desc,
                                     GrGpuResource::LifeCycle lifeCycle,
-                                    const void* srcData, size_t rowBytes) {
+                                    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.");
         return return_null_texture();
     }
 
     bool renderTarget = SkToBool(desc.fFlags & kRenderTarget_GrSurfaceFlag);
 
-    GrGLTexture::IDDesc idDesc;
-    GL_CALL(GenTextures(1, &idDesc.fTextureID));
-    idDesc.fLifeCycle = lifeCycle;
-
+    auto idDesc = generate_and_bind_gl_texture(this->glInterface(), lifeCycle);
     if (!idDesc.fTextureID) {
         return return_null_texture();
     }
 
     this->setScratchTextureUnit();
     GL_CALL(BindTexture(GR_GL_TEXTURE_2D, idDesc.fTextureID));
 
     if (renderTarget && this->glCaps().textureUsageSupport()) {
         // provides a hint about how this texture will be used
         GL_CALL(TexParameteri(GR_GL_TEXTURE_2D,
                               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(GR_GL_TEXTURE_2D,
-                          GR_GL_TEXTURE_MAG_FILTER,
-                          initialTexParams.fMagFilter));
-    GL_CALL(TexParameteri(GR_GL_TEXTURE_2D,
-                          GR_GL_TEXTURE_MIN_FILTER,
-                          initialTexParams.fMinFilter));
-    GL_CALL(TexParameteri(GR_GL_TEXTURE_2D,
-                          GR_GL_TEXTURE_WRAP_S,
-                          initialTexParams.fWrapS));
-    GL_CALL(TexParameteri(GR_GL_TEXTURE_2D,
-                          GR_GL_TEXTURE_WRAP_T,
-                          initialTexParams.fWrapT));
+    auto initialTexParams = set_initial_texture_params(this->glInterface());
+
     if (!this->uploadTexData(desc, true, 0, 0,
                              desc.fWidth, desc.fHeight,
-                             desc.fConfig, srcData, rowBytes)) {
+                             desc.fConfig, texels)) {
         GL_CALL(DeleteTextures(1, &idDesc.fTextureID));
         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(GR_GL_TEXTURE_2D, 0));
         GrGLRenderTarget::IDDesc rtIDDesc;
 
         if (!this->createRenderTargetObjects(desc, lifeCycle, idDesc.fTextureID, &rtIDDesc)) {
             GL_CALL(DeleteTextures(1, &idDesc.fTextureID));
             return return_null_texture();
         }
         tex = SkNEW_ARGS(GrGLTextureRenderTarget, (this, desc, idDesc, rtIDDesc));
     } else {
         tex = SkNEW_ARGS(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) {
+                                              SkTArray<SkMipMapLevel>& texels) {
     // Make sure that we're not flipping Y.
     if (kBottomLeft_GrSurfaceOrigin == desc.fOrigin) {
         return return_null_texture();
     }
 
-    GrGLTexture::IDDesc idDesc;
-    GL_CALL(GenTextures(1, &idDesc.fTextureID));
-    idDesc.fLifeCycle = lifeCycle;
-
+    auto idDesc = generate_and_bind_gl_texture(this->glInterface(), lifeCycle);
     if (!idDesc.fTextureID) {
         return return_null_texture();
     }
 
     this->setScratchTextureUnit();
     GL_CALL(BindTexture(GR_GL_TEXTURE_2D, idDesc.fTextureID));
 
-    // 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(GR_GL_TEXTURE_2D,
-                          GR_GL_TEXTURE_MAG_FILTER,
-                          initialTexParams.fMagFilter));
-    GL_CALL(TexParameteri(GR_GL_TEXTURE_2D,
-                          GR_GL_TEXTURE_MIN_FILTER,
-                          initialTexParams.fMinFilter));
-    GL_CALL(TexParameteri(GR_GL_TEXTURE_2D,
-                          GR_GL_TEXTURE_WRAP_S,
-                          initialTexParams.fWrapS));
-    GL_CALL(TexParameteri(GR_GL_TEXTURE_2D,
-                          GR_GL_TEXTURE_WRAP_T,
-                          initialTexParams.fWrapT));
+    auto initialTexParams = set_initial_texture_params(this->glInterface());
 
-    if (!this->uploadCompressedTexData(desc, srcData)) {
+    if (!this->uploadCompressedTexData(desc, texels)) {
         GL_CALL(DeleteTextures(1, &idDesc.fTextureID));
         return return_null_texture();
     }
 
     GrGLTexture* tex;
     tex = SkNEW_ARGS(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);
@@ skipping 66 matching lines @@
                                                                    width, height));
             created = (GR_GL_NO_ERROR == check_alloc_error(rt->desc(), this->glInterface()));
         }
         if (created) {
             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);
             SkAutoTUnref<GrGLStencilAttachment> sb(SkNEW_ARGS(GrGLStencilAttachment,
-                                                  (this, sbDesc, width, height, samples, format)));
+                                                              (this, sbDesc, width, height, samples, format)));

[bsalomon, 2015/08/26 18:30:11]

nit wrap at 100 col

[cblume, 2015/08/26 18:58:00]

Done.

             if (this->attachStencilAttachmentToRenderTarget(sb, rt)) {
                 fLastSuccessfulStencilFmtIdx = sIdx;
                 rt->renderTargetPriv().didAttachStencilAttachment(sb);
 // This work around is currently breaking on windows 7 hd2000 bot when we bind a color buffer
 #if 0
                 // Clear the stencil buffer. We use a special purpose FBO for this so that the
                 // entire stencil buffer is cleared, even if it is attached to an FBO with a
                 // smaller color target.
                 if (0 == fStencilClearFBOID) {
                     GL_CALL(GenFramebuffers(1, &fStencilClearFBOID));
@@ skipping 94 matching lines @@
             GL_CALL(FramebufferRenderbuffer(GR_GL_FRAMEBUFFER,
                                             GR_GL_DEPTH_ATTACHMENT,
                                             GR_GL_RENDERBUFFER, 0));
         }
 
         GrGLenum status;
         if (!this->glCaps().isColorConfigAndStencilFormatVerified(rt->config(), glsb->format())) {
             GL_CALL_RET(status, CheckFramebufferStatus(GR_GL_FRAMEBUFFER));
             if (status != GR_GL_FRAMEBUFFER_COMPLETE) {
                 GL_CALL(FramebufferRenderbuffer(GR_GL_FRAMEBUFFER,
-                                              GR_GL_STENCIL_ATTACHMENT,
-                                              GR_GL_RENDERBUFFER, 0));
+                                                GR_GL_STENCIL_ATTACHMENT,
+                                                GR_GL_RENDERBUFFER, 0));
                 if (glsb->format().fPacked) {
                     GL_CALL(FramebufferRenderbuffer(GR_GL_FRAMEBUFFER,
-                                                  GR_GL_DEPTH_ATTACHMENT,
-                                                  GR_GL_RENDERBUFFER, 0));
+                                                    GR_GL_DEPTH_ATTACHMENT,
+                                                    GR_GL_RENDERBUFFER, 0));
                 }
                 return false;
             } else {
                 fGLContext->caps()->markColorConfigAndStencilFormatAsVerified(
                     rt->config(),
                     glsb->format());
             }
         }
         return true;
     }
@@ skipping 1051 matching lines @@
         case kSRGBA_8888_GrPixelConfig:
             *internalFormat = GR_GL_SRGB_ALPHA;
             *externalFormat = GR_GL_SRGB_ALPHA;
             if (getSizedInternalFormat || kGL_GrGLStandard == this->glStandard()) {
                 // desktop or ES 3.0
                 SkASSERT(this->glVersion() >= GR_GL_VER(3, 0));
                 *internalFormat = GR_GL_SRGB8_ALPHA8;
                 *externalFormat = GR_GL_RGBA;
             } else {
                 // ES 2.0 with EXT_sRGB
-                SkASSERT(kGL_GrGLStandard != this->glStandard() && 
+                SkASSERT(kGL_GrGLStandard != this->glStandard() &&
                          this->glVersion() < GR_GL_VER(3, 0));
                 *internalFormat = GR_GL_SRGB_ALPHA;
                 *externalFormat = GR_GL_SRGB_ALPHA;
             }
             *externalType = GR_GL_UNSIGNED_BYTE;
             break;
         case kRGB_565_GrPixelConfig:
             *internalFormat = GR_GL_RGB;
             *externalFormat = GR_GL_RGB;
             if (getSizedInternalFormat) {
@@ skipping 87 matching lines @@
                     *internalFormat = GR_GL_ALPHA;
                 }
                 *externalFormat = GR_GL_ALPHA;
             }
             if (kGL_GrGLStandard == this->glStandard() || this->glVersion() >= GR_GL_VER(3, 0)) {
                 *externalType = GR_GL_HALF_FLOAT;
             } else {
                 *externalType = GR_GL_HALF_FLOAT_OES;
             }
             break;
-            
+
         case kRGBA_half_GrPixelConfig:
             *internalFormat = GR_GL_RGBA16F;
             *externalFormat = GR_GL_RGBA;
             if (kGL_GrGLStandard == this->glStandard() || this->glVersion() >= GR_GL_VER(3, 0)) {
                 *externalType = GR_GL_HALF_FLOAT;
             } else {
                 *externalType = GR_GL_HALF_FLOAT_OES;
             }
             break;
 
@@ skipping 174 matching lines @@
 }
 
 bool GrGLGpu::copySurface(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::createCopyProgram() {
     const char* version = GrGLGetGLSLVersionDecl(this->ctxInfo());
 
     GrGLShaderVar aVertex("a_vertex", kVec2f_GrSLType, GrShaderVar::kAttribute_TypeModifier);
     GrGLShaderVar uTexCoordXform("u_texCoordXform", kVec4f_GrSLType,
                                  GrShaderVar::kUniform_TypeModifier);
     GrGLShaderVar uPosXform("u_posXform", kVec4f_GrSLType, GrShaderVar::kUniform_TypeModifier);
     GrGLShaderVar uTexture("u_texture", kSampler2D_GrSLType, GrShaderVar::kUniform_TypeModifier);
     GrGLShaderVar vTexCoord("v_texCoord", kVec2f_GrSLType, GrShaderVar::kVaryingOut_TypeModifier);
     GrGLShaderVar oFragColor("o_FragColor", kVec4f_GrSLType, GrShaderVar::kOut_TypeModifier);
-    
+
     SkString vshaderTxt(version);
     aVertex.appendDecl(this->ctxInfo(), &vshaderTxt);
     vshaderTxt.append(";");
     uTexCoordXform.appendDecl(this->ctxInfo(), &vshaderTxt);
     vshaderTxt.append(";");
     uPosXform.appendDecl(this->ctxInfo(), &vshaderTxt);
     vshaderTxt.append(";");
     vTexCoord.appendDecl(this->ctxInfo(), &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);
@@ skipping 13 matching lines @@
         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(fCopyProgram.fProgram, CreateProgram());
     const char* str;
     GrGLint length;
 
     str = vshaderTxt.c_str();
     length = SkToInt(vshaderTxt.size());
     GrGLuint vshader = GrGLCompileAndAttachShader(*fGLContext, fCopyProgram.fProgram,
                                                   GR_GL_VERTEX_SHADER, &str, &length, 1, &fStats);
 
     str = fshaderTxt.c_str();
@@ skipping 338 matching lines @@
             this->setVertexArrayID(gpu, 0);
         }
         int attrCount = gpu->glCaps().maxVertexAttributes();
         if (fDefaultVertexArrayAttribState.count() != attrCount) {
             fDefaultVertexArrayAttribState.resize(attrCount);
         }
         attribState = &fDefaultVertexArrayAttribState;
     }
     return attribState;
 }