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// Copyright (c) 2013 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 "content/browser/renderer_host/compositing_iosurface_context_mac.h"
#include <OpenGL/gl.h>
#include <OpenGL/OpenGL.h>
#include <vector>
#include "base/command_line.h"
#include "base/debug/trace_event.h"
#include "base/logging.h"
#include "content/browser/renderer_host/compositing_iosurface_shader_programs_mac.h"
#include "content/browser/gpu/gpu_data_manager_impl.h"
#include "ui/base/ui_base_switches.h"
#include "ui/gl/gl_switches.h"
#include "ui/gl/gpu_switching_manager.h"
namespace content {
// static
scoped_refptr<CompositingIOSurfaceContext>
CompositingIOSurfaceContext::Get(int window_number) {
TRACE_EVENT0("browser", "CompositingIOSurfaceContext::Get");
// Return the context for this window_number, if it exists.
WindowMap::iterator found = window_map()->find(window_number);
if (found != window_map()->end()) {
DCHECK(!found->second->poisoned_);
return found->second;
}
static bool is_vsync_disabled =
CommandLine::ForCurrentProcess()->HasSwitch(switches::kDisableGpuVsync);
base::ScopedTypeRef<CGLContextObj> cgl_context_strong;
CGLContextObj cgl_context = NULL;
CGLError error = kCGLNoError;
// Create the pixel format object for the context.
std::vector<CGLPixelFormatAttribute> attribs;
attribs.push_back(kCGLPFADepthSize);
attribs.push_back(static_cast<CGLPixelFormatAttribute>(0));
if (ui::GpuSwitchingManager::GetInstance()->SupportsDualGpus()) {
attribs.push_back(kCGLPFAAllowOfflineRenderers);
attribs.push_back(static_cast<CGLPixelFormatAttribute>(1));
}
attribs.push_back(static_cast<CGLPixelFormatAttribute>(0));
GLint number_virtual_screens = 0;
base::ScopedTypeRef<CGLPixelFormatObj> pixel_format;
error = CGLChoosePixelFormat(&attribs.front(),
pixel_format.InitializeInto(),
&number_virtual_screens);
if (error != kCGLNoError) {
LOG(ERROR) << "Failed to create pixel format object.";
return NULL;
}
// Create all contexts in the same share group so that the textures don't
// need to be recreated when transitioning contexts.
CGLContextObj share_context = NULL;
if (!window_map()->empty())
share_context = window_map()->begin()->second->cgl_context();
error = CGLCreateContext(
pixel_format, share_context, cgl_context_strong.InitializeInto());
if (error != kCGLNoError) {
LOG(ERROR) << "Failed to create context object.";
return NULL;
}
cgl_context = cgl_context_strong;
// Note that VSync is ignored because CoreAnimation will automatically
// rate limit draws.
// Prepare the shader program cache. Precompile the shader programs
// needed to draw the IO Surface for non-offscreen contexts.
bool prepared = false;
scoped_ptr<CompositingIOSurfaceShaderPrograms> shader_program_cache;
{
gfx::ScopedCGLSetCurrentContext scoped_set_current_context(cgl_context);
shader_program_cache.reset(new CompositingIOSurfaceShaderPrograms());
if (window_number == kOffscreenContextWindowNumber) {
prepared = true;
} else {
prepared = (
shader_program_cache->UseBlitProgram() &&
shader_program_cache->UseSolidWhiteProgram());
}
glUseProgram(0u);
}
if (!prepared) {
LOG(ERROR) << "IOSurface failed to compile/link required shader programs.";
return NULL;
}
return new CompositingIOSurfaceContext(
window_number,
cgl_context_strong,
cgl_context,
is_vsync_disabled,
shader_program_cache.Pass());
}
void CompositingIOSurfaceContext::PoisonContextAndSharegroup() {
if (poisoned_)
return;
for (WindowMap::iterator it = window_map()->begin();
it != window_map()->end();
++it) {
it->second->poisoned_ = true;
}
window_map()->clear();
}
CompositingIOSurfaceContext::CompositingIOSurfaceContext(
int window_number,
base::ScopedTypeRef<CGLContextObj> cgl_context_strong,
CGLContextObj cgl_context,
bool is_vsync_disabled,
scoped_ptr<CompositingIOSurfaceShaderPrograms> shader_program_cache)
: window_number_(window_number),
cgl_context_strong_(cgl_context_strong),
cgl_context_(cgl_context),
is_vsync_disabled_(is_vsync_disabled),
shader_program_cache_(shader_program_cache.Pass()),
poisoned_(false) {
DCHECK(window_map()->find(window_number_) == window_map()->end());
window_map()->insert(std::make_pair(window_number_, this));
GpuDataManager::GetInstance()->AddObserver(this);
}
CompositingIOSurfaceContext::~CompositingIOSurfaceContext() {
GpuDataManager::GetInstance()->RemoveObserver(this);
{
gfx::ScopedCGLSetCurrentContext scoped_set_current_context(cgl_context_);
shader_program_cache_->Reset();
}
if (!poisoned_) {
DCHECK(window_map()->find(window_number_) != window_map()->end());
DCHECK(window_map()->find(window_number_)->second == this);
window_map()->erase(window_number_);
} else {
WindowMap::const_iterator found = window_map()->find(window_number_);
if (found != window_map()->end())
DCHECK(found->second != this);
}
}
void CompositingIOSurfaceContext::OnGpuSwitching() {
// Recreate all browser-side GL contexts whenever the GPU switches. If this
// is not done, performance will suffer.
// http://crbug.com/361493
PoisonContextAndSharegroup();
}
// static
CompositingIOSurfaceContext::WindowMap*
CompositingIOSurfaceContext::window_map() {
return window_map_.Pointer();
}
// static
base::LazyInstance<CompositingIOSurfaceContext::WindowMap>
CompositingIOSurfaceContext::window_map_;
} // namespace content
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