1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "ui/gl/gpu_switching_manager.h"
6
7 #include "base/command_line.h"
8 #include "base/logging.h"
9 #include "ui/gl/gl_switches.h"
10
11 #if defined(OS_MACOSX)
12 #include "base/mac/mac_util.h"
13 #include "ui/gl/gl_context_cgl.h"
14 #endif // OS_MACOSX
15
16 namespace ui {
17
18 // static
GetInstance()19 GpuSwitchingManager* GpuSwitchingManager::GetInstance() {
20 return Singleton<GpuSwitchingManager>::get();
21 }
22
GpuSwitchingManager()23 GpuSwitchingManager::GpuSwitchingManager()
24 : gpu_switching_option_(gfx::PreferIntegratedGpu),
25 gpu_switching_option_set_(false),
26 supports_dual_gpus_(false),
27 supports_dual_gpus_set_(false),
28 gpu_count_(0) {
29 #if defined(OS_MACOSX)
30 discrete_pixel_format_ = NULL;
31 #endif // OS_MACOSX
32 }
33
~GpuSwitchingManager()34 GpuSwitchingManager::~GpuSwitchingManager() {
35 #if defined(OS_MACOSX)
36 if (discrete_pixel_format_)
37 CGLReleasePixelFormat(discrete_pixel_format_);
38 #endif // OS_MACOSX
39 }
40
ForceUseOfIntegratedGpu()41 void GpuSwitchingManager::ForceUseOfIntegratedGpu() {
42 DCHECK(SupportsDualGpus());
43 if (gpu_switching_option_set_) {
44 DCHECK_EQ(gpu_switching_option_, gfx::PreferIntegratedGpu);
45 } else {
46 gpu_switching_option_ = gfx::PreferIntegratedGpu;
47 gpu_switching_option_set_ = true;
48 }
49 }
50
ForceUseOfDiscreteGpu()51 void GpuSwitchingManager::ForceUseOfDiscreteGpu() {
52 DCHECK(SupportsDualGpus());
53 if (gpu_switching_option_set_) {
54 DCHECK_EQ(gpu_switching_option_, gfx::PreferDiscreteGpu);
55 } else {
56 gpu_switching_option_ = gfx::PreferDiscreteGpu;
57 gpu_switching_option_set_ = true;
58 #if defined(OS_MACOSX)
59 // Create a pixel format that lasts the lifespan of Chrome, so Chrome
60 // stays on the discrete GPU.
61 SwitchToDiscreteGpuMac();
62 #endif // OS_MACOSX
63 }
64 }
65
SupportsDualGpus()66 bool GpuSwitchingManager::SupportsDualGpus() {
67 if (!supports_dual_gpus_set_) {
68 const CommandLine& command_line = *CommandLine::ForCurrentProcess();
69 bool flag = false;
70 if (command_line.HasSwitch(switches::kSupportsDualGpus)) {
71 // GPU process, flag is passed down from browser process.
72 std::string flag_string = command_line.GetSwitchValueASCII(
73 switches::kSupportsDualGpus);
74 if (flag_string == "true") {
75 flag = true;
76 } else if (flag_string == "false") {
77 flag = false;
78 } else {
79 NOTIMPLEMENTED();
80 }
81 } else {
82 // Browser process.
83 // We only compute this flag in the browser process.
84 #if defined(OS_MACOSX)
85 flag = (gpu_count_ == 2);
86 if (flag && command_line.HasSwitch(switches::kUseGL) &&
87 command_line.GetSwitchValueASCII(switches::kUseGL) !=
88 gfx::kGLImplementationDesktopName)
89 flag = false;
90
91 if (flag && !base::mac::IsOSLionOrLater())
92 flag = false;
93 #endif // OS_MACOSX
94 }
95 supports_dual_gpus_ = flag;
96 supports_dual_gpus_set_ = true;
97 }
98 return supports_dual_gpus_;
99 }
100
SetGpuCount(size_t gpu_count)101 void GpuSwitchingManager::SetGpuCount(size_t gpu_count) {
102 gpu_count_ = gpu_count;
103 }
104
AdjustGpuPreference(gfx::GpuPreference gpu_preference)105 gfx::GpuPreference GpuSwitchingManager::AdjustGpuPreference(
106 gfx::GpuPreference gpu_preference) {
107 if (!gpu_switching_option_set_)
108 return gpu_preference;
109 return gpu_switching_option_;
110 }
111
112 #if defined(OS_MACOSX)
SwitchToDiscreteGpuMac()113 void GpuSwitchingManager::SwitchToDiscreteGpuMac() {
114 if (discrete_pixel_format_)
115 return;
116 CGLPixelFormatAttribute attribs[1];
117 attribs[0] = static_cast<CGLPixelFormatAttribute>(0);
118 GLint num_pixel_formats = 0;
119 CGLChoosePixelFormat(attribs, &discrete_pixel_format_, &num_pixel_formats);
120 }
121 #endif // OS_MACOSX
122
123 } // namespace ui
124