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// Copyright (c) 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 "ui/gl/gpu_switching_manager.h"
#include "base/command_line.h"
#include "base/logging.h"
#include "ui/gl/gl_switches.h"
#if defined(OS_MACOSX)
#include "base/mac/mac_util.h"
#include "ui/gl/gl_context_cgl.h"
#endif // OS_MACOSX
namespace {
#if defined(OS_MACOSX)
bool SupportsOnlineAndOfflineRenderers() {
// Enumerate all hardware-accelerated renderers. If we find one
// online and one offline, assume we're on a dual-GPU system.
GLuint display_mask = static_cast<GLuint>(-1);
CGLRendererInfoObj renderer_info = NULL;
GLint num_renderers = 0;
bool found_online = false;
bool found_offline = false;
if (CGLQueryRendererInfo(display_mask,
&renderer_info,
&num_renderers) != kCGLNoError) {
return false;
}
gfx::ScopedCGLRendererInfoObj scoper(renderer_info);
for (GLint i = 0; i < num_renderers; ++i) {
GLint accelerated = 0;
if (CGLDescribeRenderer(renderer_info,
i,
kCGLRPAccelerated,
&accelerated) != kCGLNoError) {
return false;
}
if (!accelerated)
continue;
GLint online = 0;
if (CGLDescribeRenderer(renderer_info,
i,
kCGLRPOnline,
&online) != kCGLNoError) {
return false;
}
if (online) {
found_online = true;
} else {
found_offline = true;
}
}
return (found_online && found_offline);
}
#endif // OS_MACOSX
} // namespace anonymous
namespace ui {
// static
GpuSwitchingManager* GpuSwitchingManager::GetInstance() {
return Singleton<GpuSwitchingManager>::get();
}
GpuSwitchingManager::GpuSwitchingManager()
: gpu_switching_option_(gfx::PreferIntegratedGpu),
gpu_switching_option_set_(false),
supports_dual_gpus_(false),
supports_dual_gpus_set_(false) {
#if defined(OS_MACOSX)
discrete_pixel_format_ = NULL;
#endif // OS_MACOSX
}
GpuSwitchingManager::~GpuSwitchingManager() {
#if defined(OS_MACOSX)
if (discrete_pixel_format_)
CGLReleasePixelFormat(discrete_pixel_format_);
#endif // OS_MACOSX
}
void GpuSwitchingManager::ForceUseOfIntegratedGpu() {
DCHECK(SupportsDualGpus());
if (gpu_switching_option_set_) {
DCHECK_EQ(gpu_switching_option_, gfx::PreferIntegratedGpu);
} else {
gpu_switching_option_ = gfx::PreferIntegratedGpu;
gpu_switching_option_set_ = true;
}
}
void GpuSwitchingManager::ForceUseOfDiscreteGpu() {
DCHECK(SupportsDualGpus());
if (gpu_switching_option_set_) {
DCHECK_EQ(gpu_switching_option_, gfx::PreferDiscreteGpu);
} else {
gpu_switching_option_ = gfx::PreferDiscreteGpu;
gpu_switching_option_set_ = true;
#if defined(OS_MACOSX)
// Create a pixel format that lasts the lifespan of Chrome, so Chrome
// stays on the discrete GPU.
SwitchToDiscreteGpuMac();
#endif // OS_MACOSX
}
}
bool GpuSwitchingManager::SupportsDualGpus() {
if (!supports_dual_gpus_set_) {
const CommandLine& command_line = *CommandLine::ForCurrentProcess();
bool flag = false;
if (command_line.HasSwitch(switches::kSupportsDualGpus)) {
// GPU process, flag is passed down from browser process.
std::string flag_string = command_line.GetSwitchValueASCII(
switches::kSupportsDualGpus);
if (flag_string == "true") {
flag = true;
} else if (flag_string == "false") {
flag = false;
} else {
NOTIMPLEMENTED();
}
} else {
// Browser process.
// We only compute this flag in the browser process.
#if defined(OS_MACOSX)
flag = SupportsOnlineAndOfflineRenderers();
if (flag && command_line.HasSwitch(switches::kUseGL) &&
command_line.GetSwitchValueASCII(switches::kUseGL) !=
gfx::kGLImplementationDesktopName)
flag = false;
if (flag && !base::mac::IsOSLionOrLater())
flag = false;
#endif // OS_MACOSX
}
supports_dual_gpus_ = flag;
supports_dual_gpus_set_ = true;
}
return supports_dual_gpus_;
}
gfx::GpuPreference GpuSwitchingManager::AdjustGpuPreference(
gfx::GpuPreference gpu_preference) {
if (!gpu_switching_option_set_)
return gpu_preference;
return gpu_switching_option_;
}
#if defined(OS_MACOSX)
void GpuSwitchingManager::SwitchToDiscreteGpuMac() {
if (discrete_pixel_format_)
return;
CGLPixelFormatAttribute attribs[1];
attribs[0] = static_cast<CGLPixelFormatAttribute>(0);
GLint num_pixel_formats = 0;
CGLChoosePixelFormat(attribs, &discrete_pixel_format_, &num_pixel_formats);
}
#endif // OS_MACOSX
} // namespace ui
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