content/browser/renderer_host/compositing_iosurface_context_mac.mm

   1 // Copyright (c) 2013 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 "content/browser/renderer_host/compositing_iosurface_context_mac.h"
   6
   7 #include <OpenGL/gl.h>
   8 #include <OpenGL/OpenGL.h>
   9 #include <vector>
  10
  11 #include "base/command_line.h"
  12 #include "base/debug/trace_event.h"
  13 #include "base/logging.h"
  14 #include "content/browser/renderer_host/compositing_iosurface_shader_programs_mac.h"
  15 #include "ui/gl/gl_switches.h"
  16 #include "ui/gl/gpu_switching_manager.h"
  17
  18 namespace content {
  19
  20 // static
  21 scoped_refptr<CompositingIOSurfaceContext>
  22 CompositingIOSurfaceContext::Get(int window_number) {
  23   TRACE_EVENT0("browser", "CompositingIOSurfaceContext::Get");
  24
  25   // Return the context for this window_number, if it exists.
  26   WindowMap::iterator found = window_map()->find(window_number);
  27   if (found != window_map()->end()) {
  28     DCHECK(found->second->can_be_shared_);
  29     return found->second;
  30   }
  31
  32   std::vector<NSOpenGLPixelFormatAttribute> attributes;
  33   attributes.push_back(NSOpenGLPFADoubleBuffer);
  34   // We don't need a depth buffer - try setting its size to 0...
  35   attributes.push_back(NSOpenGLPFADepthSize); attributes.push_back(0);
  36   if (ui::GpuSwitchingManager::GetInstance()->SupportsDualGpus())
  37     attributes.push_back(NSOpenGLPFAAllowOfflineRenderers);
  38   attributes.push_back(0);
  39
  40   base::scoped_nsobject<NSOpenGLPixelFormat> glPixelFormat(
  41       [[NSOpenGLPixelFormat alloc] initWithAttributes:&attributes.front()]);
  42   if (!glPixelFormat) {
  43     LOG(ERROR) << "NSOpenGLPixelFormat initWithAttributes failed";
  44     return NULL;
  45   }
  46
  47   // Create all contexts in the same share group so that the textures don't
  48   // need to be recreated when transitioning contexts.
  49   NSOpenGLContext* share_context = nil;
  50   if (!window_map()->empty())
  51     share_context = window_map()->begin()->second->nsgl_context();
  52   base::scoped_nsobject<NSOpenGLContext> nsgl_context(
  53       [[NSOpenGLContext alloc] initWithFormat:glPixelFormat
  54                                  shareContext:share_context]);
  55   if (!nsgl_context) {
  56     LOG(ERROR) << "NSOpenGLContext initWithFormat failed";
  57     return NULL;
  58   }
  59
  60   CGLContextObj cgl_context = (CGLContextObj)[nsgl_context CGLContextObj];
  61   if (!cgl_context) {
  62     LOG(ERROR) << "CGLContextObj failed";
  63     return NULL;
  64   }
  65
  66   // Draw at beam vsync.
  67   bool is_vsync_disabled =
  68       CommandLine::ForCurrentProcess()->HasSwitch(switches::kDisableGpuVsync);
  69   GLint swapInterval = is_vsync_disabled ? 0 : 1;
  70   [nsgl_context setValues:&swapInterval forParameter:NSOpenGLCPSwapInterval];
  71
  72   // Prepare the shader program cache. Precompile the shader programs
  73   // needed to draw the IO Surface for non-offscreen contexts.
  74   CGLSetCurrentContext(cgl_context);
  75   scoped_ptr<CompositingIOSurfaceShaderPrograms> shader_program_cache(
  76       new CompositingIOSurfaceShaderPrograms());
  77   bool prepared = false;
  78   if (window_number == kOffscreenContextWindowNumber) {
  79     prepared = true;
  80   } else {
  81     prepared = (
  82         shader_program_cache->UseBlitProgram() &&
  83         shader_program_cache->UseSolidWhiteProgram());
  84   }
  85   glUseProgram(0u);
  86   CGLSetCurrentContext(0);
  87   if (!prepared) {
  88     LOG(ERROR) << "IOSurface failed to compile/link required shader programs.";
  89     return NULL;
  90   }
  91
  92   return new CompositingIOSurfaceContext(
  93       window_number,
  94       nsgl_context.release(),
  95       cgl_context,
  96       is_vsync_disabled,
  97       shader_program_cache.Pass());
  98 }
  99
 100 // static
 101 void CompositingIOSurfaceContext::MarkExistingContextsAsNotShareable() {
 102   for (WindowMap::iterator it = window_map()->begin();
 103        it != window_map()->end();
 104        ++it) {
 105     it->second->can_be_shared_ = false;
 106   }
 107   window_map()->clear();
 108 }
 109
 110 CompositingIOSurfaceContext::CompositingIOSurfaceContext(
 111     int window_number,
 112     NSOpenGLContext* nsgl_context,
 113     CGLContextObj cgl_context,
 114     bool is_vsync_disabled,
 115     scoped_ptr<CompositingIOSurfaceShaderPrograms> shader_program_cache)
 116     : window_number_(window_number),
 117       nsgl_context_(nsgl_context),
 118       cgl_context_(cgl_context),
 119       is_vsync_disabled_(is_vsync_disabled),
 120       shader_program_cache_(shader_program_cache.Pass()),
 121       can_be_shared_(true),
 122       initialized_is_intel_(false),
 123       is_intel_(false),
 124       screen_(0) {
 125   DCHECK(window_map()->find(window_number_) == window_map()->end());
 126   window_map()->insert(std::make_pair(window_number_, this));
 127 }
 128
 129 CompositingIOSurfaceContext::~CompositingIOSurfaceContext() {
 130   CGLSetCurrentContext(cgl_context_);
 131   shader_program_cache_->Reset();
 132   CGLSetCurrentContext(0);
 133   if (can_be_shared_) {
 134     DCHECK(window_map()->find(window_number_) != window_map()->end());
 135     DCHECK(window_map()->find(window_number_)->second == this);
 136     window_map()->erase(window_number_);
 137   } else {
 138     WindowMap::const_iterator found = window_map()->find(window_number_);
 139     if (found != window_map()->end())
 140       DCHECK(found->second != this);
 141   }
 142 }
 143
 144 bool CompositingIOSurfaceContext::IsVendorIntel() {
 145   GLint screen;
 146   CGLGetVirtualScreen(cgl_context(), &screen);
 147   if (screen != screen_)
 148     initialized_is_intel_ = false;
 149   screen_ = screen;
 150   if (!initialized_is_intel_) {
 151     is_intel_ = strstr(reinterpret_cast<const char*>(glGetString(GL_VENDOR)),
 152                       "Intel") != NULL;
 153     initialized_is_intel_ = true;
 154   }
 155   return is_intel_;
 156 }
 157
 158 // static
 159 CompositingIOSurfaceContext::WindowMap*
 160     CompositingIOSurfaceContext::window_map() {
 161   return window_map_.Pointer();
 162 }
 163
 164 // static
 165 base::LazyInstance<CompositingIOSurfaceContext::WindowMap>
 166     CompositingIOSurfaceContext::window_map_;
 167
 168 }  // namespace content