Implement GL support for buffer textures

src/gpu/gl/GrGLTexture.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 "GrGLTexture.h"
 #include "GrGLGpu.h"
 #include "SkTraceMemoryDump.h"
 
 #define GPUGL static_cast<GrGLGpu*>(this->getGpu())
 #define GL_CALL(X) GR_GL_CALL(GPUGL->glInterface(), X)
 
 inline static GrSLType sampler_type(const GrGLTexture::IDDesc& idDesc, const GrGLGpu* gpu) {
     if (idDesc.fInfo.fTarget == GR_GL_TEXTURE_EXTERNAL) {
         SkASSERT(gpu->glCaps().glslCaps()->externalTextureSupport());
         return kSamplerExternal_GrSLType;
     } else if (idDesc.fInfo.fTarget == GR_GL_TEXTURE_RECTANGLE) {
         SkASSERT(gpu->glCaps().rectangleTextureSupport());
         return kSampler2DRect_GrSLType;
+    } else if (GR_GL_TEXTURE_BUFFER == idDesc.fInfo.fTarget) {
+        return kSamplerBuffer_GrSLType;
     } else {
         SkASSERT(idDesc.fInfo.fTarget == GR_GL_TEXTURE_2D);
         return kSampler2D_GrSLType;
     }
 }
 
 // Because this class is virtually derived from GrSurface we must explicitly call its constructor.
 GrGLTexture::GrGLTexture(GrGLGpu* gpu, const GrSurfaceDesc& desc, const IDDesc& idDesc)
     : GrSurface(gpu, idDesc.fLifeCycle, desc)
     , INHERITED(gpu, idDesc.fLifeCycle, desc, sampler_type(idDesc, gpu), false) {
@@ skipping 53 matching lines @@
 #endif
 }
 
 void GrGLTexture::setMemoryBacking(SkTraceMemoryDump* traceMemoryDump,
                                    const SkString& dumpName) const {
     SkString texture_id;
     texture_id.appendU32(this->textureID());
     traceMemoryDump->setMemoryBacking(dumpName.c_str(), "gl_texture",
                                       texture_id.c_str());
 }