ui/gl/gpu_switching_manager.cc

   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
  19 GpuSwitchingManager* GpuSwitchingManager::GetInstance() {
  20   return Singleton<GpuSwitchingManager>::get();
  21 }
  22
  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
  34 GpuSwitchingManager::~GpuSwitchingManager() {
  35 #if defined(OS_MACOSX)
  36   if (discrete_pixel_format_)
  37     CGLReleasePixelFormat(discrete_pixel_format_);
  38 #endif  // OS_MACOSX
  39 }
  40
  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
  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
  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
 101 void GpuSwitchingManager::SetGpuCount(size_t gpu_count) {
 102   gpu_count_ = gpu_count;
 103 }
 104
 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)
 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