Implement texel buffers

src/gpu/gl/GrGLBuffer.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrGLBuffer.h"
 #include "GrGLGpu.h"
 #include "SkTraceMemoryDump.h"
@@ skipping 78 matching lines @@
 }
 
 GrGLBuffer::GrGLBuffer(GrGLGpu* gpu, size_t size, GrBufferType intendedType,
                        GrAccessPattern accessPattern, bool cpuBacked, const void* data)
     : INHERITED(gpu, size, intendedType, accessPattern, cpuBacked),
       fCPUData(nullptr),
       fIntendedType(intendedType),
       fBufferID(0),
       fSizeInBytes(size),
       fUsage(gr_to_gl_access_pattern(intendedType, accessPattern)),
-      fGLSizeInBytes(0) {
+      fGLSizeInBytes(0),
+      fHasAttachedToTexture(false) {
     if (this->isCPUBacked()) {
         // Core profile uses vertex array objects, which disallow client side arrays.
         SkASSERT(!gpu->glCaps().isCoreProfile());
         if (gpu->caps()->mustClearUploadedBufferData()) {
             fCPUData = sk_calloc_throw(fSizeInBytes);
         } else {
             fCPUData = sk_malloc_flags(fSizeInBytes, SK_MALLOC_THROW);
         }
         if (data) {
             memcpy(fCPUData, data, fSizeInBytes);
@@ skipping 34 matching lines @@
         VALIDATE();
         // make sure we've not been abandoned or already released
         if (fCPUData) {
             SkASSERT(!fBufferID);
             sk_free(fCPUData);
             fCPUData = nullptr;
         } else if (fBufferID) {
             GL_CALL(DeleteBuffers(1, &fBufferID));
             fBufferID = 0;
             fGLSizeInBytes = 0;
+            this->glGpu()->notifyBufferReleased(this);
         }
         fMapPtr = nullptr;
         VALIDATE();
     }
 
     INHERITED::onRelease();
 }
 
 void GrGLBuffer::onAbandon() {
     fBufferID = 0;
@@ skipping 151 matching lines @@
 
 void GrGLBuffer::validate() const {
     // The following assert isn't valid when the buffer has been abandoned:
     // SkASSERT((0 == fDesc.fID) == (fCPUData));
     SkASSERT(0 != fBufferID || 0 == fGLSizeInBytes);
     SkASSERT(nullptr == fMapPtr || fCPUData || fGLSizeInBytes <= fSizeInBytes);
     SkASSERT(nullptr == fCPUData || nullptr == fMapPtr || fCPUData == fMapPtr);
 }
 
 #endif