GPU client side changes for GpuMemoryBuffers

gpu/command_buffer/client/gpu_memory_buffer_tracker.cc

Index: gpu/command_buffer/client/gpu_memory_buffer_tracker.cc
diff --git a/gpu/command_buffer/client/gpu_memory_buffer_tracker.cc b/gpu/command_buffer/client/gpu_memory_buffer_tracker.cc
new file mode 100644
index 0000000000000000000000000000000000000000..b336796edb06109a8a992b39b9b55721c71763ce
--- /dev/null
+++ b/gpu/command_buffer/client/gpu_memory_buffer_tracker.cc
@@ -0,0 +1,57 @@
+// Copyright (c) 2013 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 "../client/gpu_memory_buffer_tracker.h"
+
+#include "../client/gles2_implementation.h"
+#include "../client/gpu_memory_buffer.h"
+#include "../client/image_factory.h"
+#include "base/memory/scoped_ptr.h"
+
+namespace gpu {
+namespace gles2 {
+
+GpuMemoryBufferTracker::GpuMemoryBufferTracker(ImageFactory* factory)
+    : buffers_(),
+      factory_(factory) {
+}
+
+GpuMemoryBufferTracker::~GpuMemoryBufferTracker() {
+  while (!buffers_.empty()) {
+    RemoveBuffer(buffers_.begin()->first);
+  }
+}
+
+GLuint GpuMemoryBufferTracker::CreateBuffer(
+    GLsizei width, GLsizei height, GLenum internalformat) {
+  GLuint image_id = 0;
+  DCHECK(factory_);
+  scoped_ptr<GpuMemoryBuffer> buffer =
+      factory_->CreateGpuMemoryBuffer(width, height, internalformat, &image_id);
+
+  std::pair<BufferMap::iterator, bool> result =
+      buffers_.insert(std::make_pair(image_id, buffer.release()));
+  GPU_DCHECK(result.second);
+
+  return image_id;
+}
+
+GpuMemoryBuffer* GpuMemoryBufferTracker::GetBuffer(GLuint image_id) {
+  BufferMap::iterator it = buffers_.find(image_id);
+  return (it != buffers_.end()) ? it->second : NULL;
+}
+
+void GpuMemoryBufferTracker::RemoveBuffer(GLuint image_id) {
+  BufferMap::iterator buffer_it = buffers_.find(image_id);
+  if (buffer_it != buffers_.end()) {
+    GpuMemoryBuffer* buffer = buffer_it->second;
+    buffers_.erase(buffer_it);
+    delete buffer;
+  }
+  DCHECK(factory_);
+  factory_->DeleteGpuMemoryBuffer(image_id);
+}
+
+}  // namespace gles2
+}  // namespace gpu