Initial work to get ETC1 data up to the GPU

src/gpu/gl/GrGpuGL.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 "GrGpuGL.h"
 #include "GrGLStencilBuffer.h"
@@ skipping 684 matching lines @@
     if (restoreGLRowLength) {
         SkASSERT(this->glCaps().unpackRowLengthSupport());
         GL_CALL(PixelStorei(GR_GL_UNPACK_ROW_LENGTH, 0));
     }
     if (glFlipY) {
         GL_CALL(PixelStorei(GR_GL_UNPACK_FLIP_Y, GR_GL_FALSE));
     }
     return succeeded;
 }
 
+bool GrGpuGL::uploadCompressedTexData(const GrGLTexture::Desc& desc,
+                                      const void* data) {
+    SkASSERT(NULL != data);
+
+    // No support for software flip y, yet...
+    SkASSERT(kBottomLeft_GrSurfaceOrigin != desc.fOrigin);
+
+    // Make sure that the width and height that we pass to OpenGL
+    // is a multiple of the block size.
+    int dataSize = GrCompressedFormatDataSize(desc.fConfig, desc.fWidth, desc.fHeight);
+
+    // We only need the internal format for compressed 2D textures.
+    GrGLenum internalFormat = 0;
+    if (!this->configToGLFormats(desc.fConfig, false, &internalFormat, NULL, NULL)) {
+        return false;
+    }
+
+    bool succeeded = true;
+    CLEAR_ERROR_BEFORE_ALLOC(this->glInterface());
+    GL_ALLOC_CALL(this->glInterface(),
+                  CompressedTexImage2D(GR_GL_TEXTURE_2D,
+                                       0, // level
+                                       internalFormat,
+                                       desc.fWidth, desc.fHeight,
+                                       0, // border
+                                       dataSize,
+                                       data));
+
+    GrGLenum error = check_alloc_error(desc, this->glInterface());
+    if (error != GR_GL_NO_ERROR) {
+        succeeded = false;
+    }
+    return succeeded;
+}
+
 static bool renderbuffer_storage_msaa(GrGLContext& ctx,
                                       int sampleCount,
                                       GrGLenum format,
                                       int width, int height) {
     CLEAR_ERROR_BEFORE_ALLOC(ctx.interface());
     SkASSERT(GrGLCaps::kNone_MSFBOType != ctx.caps()->msFBOType());
     switch (ctx.caps()->msFBOType()) {
         case GrGLCaps::kDesktop_ARB_MSFBOType:
         case GrGLCaps::kDesktop_EXT_MSFBOType:
         case GrGLCaps::kES_3_0_MSFBOType:
@@ skipping 259 matching lines @@
         tex = SkNEW_ARGS(GrGLTexture, (this, glTexDesc));
     }
     tex->setCachedTexParams(initialTexParams, this->getResetTimestamp());
 #ifdef TRACE_TEXTURE_CREATION
     GrPrintf("--- new texture [%d] size=(%d %d) config=%d\n",
              glTexDesc.fTextureID, desc.fWidth, desc.fHeight, desc.fConfig);
 #endif
     return tex;
 }
 
+GrTexture* GrGpuGL::onCreateCompressedTexture(const GrTextureDesc& desc,
+                                              const void* srcData) {
+
+    if(SkToBool(desc.fFlags & kRenderTarget_GrTextureFlagBit)) {
+        return return_null_texture();
+    }
+
+    // Make sure that we're not flipping Y.
+    GrSurfaceOrigin texOrigin = resolve_origin(desc.fOrigin, false);
+    if (kBottomLeft_GrSurfaceOrigin == texOrigin) {
+        return return_null_texture();
+    }
+
+    GrGLTexture::Desc glTexDesc;
+
+    glTexDesc.fFlags  = desc.fFlags;
+    glTexDesc.fWidth  = desc.fWidth;
+    glTexDesc.fHeight = desc.fHeight;
+    glTexDesc.fConfig = desc.fConfig;
+    glTexDesc.fIsWrapped = false;
+    glTexDesc.fOrigin = texOrigin;
+
+    int maxSize = this->caps()->maxTextureSize();
+    if (glTexDesc.fWidth > maxSize || glTexDesc.fHeight > maxSize) {
+        return return_null_texture();
+    }
+
+    GL_CALL(GenTextures(1, &glTexDesc.fTextureID));
+
+    if (!glTexDesc.fTextureID) {
+        return return_null_texture();
+    }
+
+    this->setScratchTextureUnit();
+    GL_CALL(BindTexture(GR_GL_TEXTURE_2D, glTexDesc.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));
+
+    if (!this->uploadCompressedTexData(glTexDesc, srcData)) {
+        GL_CALL(DeleteTextures(1, &glTexDesc.fTextureID));
+        return return_null_texture();
+    }
+
+    GrGLTexture* tex;
+    tex = SkNEW_ARGS(GrGLTexture, (this, glTexDesc));
+    tex->setCachedTexParams(initialTexParams, this->getResetTimestamp());
+#ifdef TRACE_TEXTURE_CREATION
+    GrPrintf("--- new compressed texture [%d] size=(%d %d) config=%d\n",
+             glTexDesc.fTextureID, desc.fWidth, desc.fHeight, desc.fConfig);
+#endif
+    return tex;
+}
+
 namespace {
 
 const GrGLuint kUnknownBitCount = GrGLStencilBuffer::kUnknownBitCount;
 
 void inline get_stencil_rb_sizes(const GrGLInterface* gl,
                                  GrGLStencilBuffer::Format* format) {
 
     // we shouldn't ever know one size and not the other
     SkASSERT((kUnknownBitCount == format->fStencilBits) ==
              (kUnknownBitCount == format->fTotalBits));
@@ skipping 1832 matching lines @@
             this->setVertexArrayID(gpu, 0);
         }
         int attrCount = gpu->glCaps().maxVertexAttributes();
         if (fDefaultVertexArrayAttribState.count() != attrCount) {
             fDefaultVertexArrayAttribState.resize(attrCount);
         }
         attribState = &fDefaultVertexArrayAttribState;
     }
     return attribState;
 }