Re-land r92885, which was reverted in r92891.

ppapi/shared_impl/graphics_3d_impl.cc

+// Copyright (c) 2011 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 "ppapi/shared_impl/graphics_3d_impl.h"
+
+#include "base/logging.h"
+#include "gpu/command_buffer/client/gles2_cmd_helper.h"
+#include "gpu/command_buffer/client/gles2_implementation.h"
+#include "ppapi/c/pp_errors.h"
+
+namespace ppapi {
+
+Graphics3DImpl::Graphics3DImpl()
+    : transfer_buffer_id_(-1),
+      swap_callback_(PP_BlockUntilComplete()) {
+}
+
+Graphics3DImpl::~Graphics3DImpl() {
+  // Make sure that GLES2 implementation has already been destroyed.
+  DCHECK_EQ(transfer_buffer_id_, -1);
+  DCHECK(!gles2_helper_.get());
+  DCHECK(!gles2_impl_.get());
+}
+
+int32_t Graphics3DImpl::GetAttribs(int32_t* attrib_list) {
+  // TODO(alokp): Implement me.
+  return PP_ERROR_FAILED;
+}
+
+int32_t Graphics3DImpl::SetAttribs(int32_t* attrib_list) {
+  // TODO(alokp): Implement me.
+  return PP_ERROR_FAILED;
+}
+
+int32_t Graphics3DImpl::SwapBuffers(PP_CompletionCallback callback) {
+  if (!callback.func) {
+    // Blocking SwapBuffers isn't supported (since we have to be on the main
+    // thread).
+    return PP_ERROR_BADARGUMENT;
+  }
+
+  if (HasPendingSwap()) {
+    // Already a pending SwapBuffers that hasn't returned yet.
+    return PP_ERROR_INPROGRESS;
+  }
+
+  swap_callback_ = callback;
+  return DoSwapBuffers();
+}
+
+void Graphics3DImpl::SwapBuffersACK(int32_t pp_error) {
+  DCHECK(HasPendingSwap());
+  PP_RunAndClearCompletionCallback(&swap_callback_, pp_error);
+}
+
+bool Graphics3DImpl::CreateGLES2Impl(int32 command_buffer_size,
+                                     int32 transfer_buffer_size) {
+  gpu::CommandBuffer* command_buffer = GetCommandBuffer();
+  DCHECK(command_buffer);
+
+  // Create the GLES2 helper, which writes the command buffer protocol.
+  gles2_helper_.reset(new gpu::gles2::GLES2CmdHelper(command_buffer));
+  if (!gles2_helper_->Initialize(command_buffer_size))
+    return false;
+
+  // Create a transfer buffer used to copy resources between the renderer
+  // process and the GPU process.
+  transfer_buffer_id_ =
+      command_buffer->CreateTransferBuffer(transfer_buffer_size, -1);
+  if (transfer_buffer_id_ < 0)
+    return false;
+
+  // Map the buffer into the renderer process's address space.
+  gpu::Buffer transfer_buffer =
+      command_buffer->GetTransferBuffer(transfer_buffer_id_);
+  if (!transfer_buffer.ptr)
+    return false;
+
+  // Create the object exposing the OpenGL API.
+  gles2_impl_.reset(new gpu::gles2::GLES2Implementation(
+      gles2_helper_.get(),
+      transfer_buffer.size,
+      transfer_buffer.ptr,
+      transfer_buffer_id_,
+      false));
+
+  return true;
+}
+
+void Graphics3DImpl::DestroyGLES2Impl() {
+  gles2_impl_.reset();
+
+  if (transfer_buffer_id_ != -1) {
+    gpu::CommandBuffer* command_buffer = GetCommandBuffer();
+    DCHECK(command_buffer);
+    command_buffer->DestroyTransferBuffer(transfer_buffer_id_);
+    transfer_buffer_id_ = -1;
+  }
+
+  gles2_helper_.reset();
+}
+
+}  // namespace ppapi
+