Support dynamic switching between integrated and discrete GPUs on Mac OS X.

content/common/gpu/gpu_command_buffer_stub.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.
 
 #if defined(ENABLE_GPU)
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/shared_memory.h"
@@ skipping 11 matching lines @@
 #endif
 
 GpuCommandBufferStub::GpuCommandBufferStub(
     GpuChannel* channel,
     GpuCommandBufferStub* share_group,
     gfx::PluginWindowHandle handle,
     const gfx::Size& size,
     const gpu::gles2::DisallowedFeatures& disallowed_features,
     const std::string& allowed_extensions,
     const std::vector<int32>& attribs,
+    gfx::GpuPreference gpu_preference,
     int32 route_id,
     int32 renderer_id,
     int32 render_view_id,
     GpuWatchdog* watchdog,
     bool software)
     : channel_(channel),
       handle_(handle),
       initial_size_(size),
       disallowed_features_(disallowed_features),
       allowed_extensions_(allowed_extensions),
       requested_attribs_(attribs),
+      gpu_preference_(gpu_preference),
       route_id_(route_id),
       software_(software),
       last_flush_count_(0),
       renderer_id_(renderer_id),
       render_view_id_(render_view_id),
       parent_stub_for_initialization_(),
       parent_texture_for_initialization_(0),
       watchdog_(watchdog),
       task_factory_(ALLOW_THIS_IN_INITIALIZER_LIST(this)) {
   if (share_group) {
@@ skipping 143 matching lines @@
     surface_ = gfx::GLSurface::CreateOffscreenGLSurface(software_,
                                                         gfx::Size(1, 1));
   }
 
   if (!surface_.get()) {
     LOG(ERROR) << "Failed to create surface.\n";
     OnInitializeFailed(reply_message);
     return;
   }
 
-  context_ = gfx::GLContext::CreateGLContext(channel_->share_group(),
-                                             surface_.get());
+  gfx::GpuPreference gpu_preference =
+      channel_->ShouldPreferDiscreteGpu() ?
+          gfx::PreferDiscreteGpu : gpu_preference_;
+
+  context_ = gfx::GLContext::CreateGLContext(
+      channel_->share_group(),
+      surface_.get(),
+      gpu_preference);
   if (!context_.get()) {
     LOG(ERROR) << "Failed to create context.\n";
     OnInitializeFailed(reply_message);
     return;
   }
 
   // Initialize the decoder with either the view or pbuffer GLContext.
   if (!decoder_->Initialize(surface_.get(),
                             context_.get(),
                             initial_size_,
@@ skipping 273 matching lines @@
   channel_->AddRoute(decoder_route_id, decoder);
   decoder->Initialize(profile, reply_message);
 }
 
 void GpuCommandBufferStub::OnDestroyVideoDecoder(int decoder_route_id) {
   channel_->RemoveRoute(decoder_route_id);
   video_decoders_.Remove(decoder_route_id);
 }
 
 #endif  // defined(ENABLE_GPU)