cc: Refactor ResourceProvider.

cc/resources/resource_helper.cc

+// Copyright 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "cc/resources/resource_helper.h"
+
+#include "gpu/GLES2/gl2extchromium.h"
+#include "gpu/command_buffer/client/gles2_interface.h"
+#include "third_party/khronos/GLES2/gl2.h"
+#include "third_party/khronos/GLES2/gl2ext.h"
+#include "third_party/skia/include/gpu/GrContext.h"
+
+using gpu::gles2::GLES2Interface;
+
+namespace cc {
+
+ResourceHelper::ResourceHelper(OutputSurface* output_surface)
+    : output_surface_(output_surface) {
+}
+
+ResourceHelper::~ResourceHelper() {
+}
+
+ResourceHelper::ScopedGpuRaster::ScopedGpuRaster(
+    ResourceHelper* resource_helper)
+    : resource_helper_(resource_helper) {
+  BeginGpuRaster();
+}
+
+ResourceHelper::ScopedGpuRaster::~ScopedGpuRaster() {
+  EndGpuRaster();
+}
+
+void ResourceHelper::Flush() {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  GLES2Interface* gl = this->ContextGL();
+  if (gl)
+    gl->Flush();
+}
+
+void ResourceHelper::Finish() {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  GLES2Interface* gl = this->ContextGL();
+  if (gl)
+    gl->Finish();
+}
+
+bool ResourceHelper::ShallowFlushIfSupported() {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  GLES2Interface* gl = this->ContextGL();
+  if (!gl)
+    return false;
+
+  gl->ShallowFlushCHROMIUM();
+  return true;
+}
+
+GLint ResourceHelper::GetActiveTextureUnit(GLES2Interface* gl) {
+  GLint active_unit = 0;
+  gl->GetIntegerv(GL_ACTIVE_TEXTURE, &active_unit);
+  return active_unit;
+}
+
+GLES2Interface* ResourceHelper::ContextGL() const {
+  ContextProvider* context_provider = output_surface_->context_provider();
+  return context_provider ? context_provider->ContextGL() : NULL;
+}
+
+class GrContext* ResourceHelper::GrContext() const {
+  ContextProvider* context_provider = output_surface_->context_provider();
+  return context_provider ? context_provider->GrContext() : NULL;
+}
+
+void ResourceHelper::ScopedGpuRaster::BeginGpuRaster() {
+  GLES2Interface* gl = resource_helper_->ContextGL();
+  DCHECK(gl);
+
+  // TODO(alokp): Use a trace macro to push/pop markers.
+  // Using push/pop functions directly incurs cost to evaluate function
+  // arguments even when tracing is disabled.
+  gl->PushGroupMarkerEXT(0, "GpuRasterization");
+
+  class GrContext* gr_context = resource_helper_->GrContext();
+  if (gr_context)
+    gr_context->resetContext();
+}
+
+void ResourceHelper::ScopedGpuRaster::EndGpuRaster() {
+  GLES2Interface* gl = resource_helper_->ContextGL();
+  DCHECK(gl);
+
+  class GrContext* gr_context = resource_helper_->GrContext();
+  if (gr_context)
+    gr_context->flush();
+
+  // TODO(alokp): Use a trace macro to push/pop markers.
+  // Using push/pop functions directly incurs cost to evaluate function
+  // arguments even when tracing is disabled.
+  gl->PopGroupMarkerEXT();
+}
+
+}  // namespace cc