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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/gl_context_cgl.h"
#include <OpenGL/CGLRenderers.h>
#include <OpenGL/CGLTypes.h>
#include <vector>
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "base/trace_event/trace_event.h"
#include "ui/gl/gl_bindings.h"
#include "ui/gl/gl_implementation.h"
#include "ui/gl/gl_surface.h"
#include "ui/gl/gpu_switching_manager.h"
namespace gfx {
namespace {
bool g_support_renderer_switching;
struct CGLRendererInfoObjDeleter {
void operator()(CGLRendererInfoObj* x) {
if (x)
CGLDestroyRendererInfo(*x);
}
};
} // namespace
static CGLPixelFormatObj GetPixelFormat() {
static CGLPixelFormatObj format;
if (format)
return format;
std::vector<CGLPixelFormatAttribute> attribs;
// If the system supports dual gpus then allow offline renderers for every
// context, so that they can all be in the same share group.
if (ui::GpuSwitchingManager::GetInstance()->SupportsDualGpus()) {
attribs.push_back(kCGLPFAAllowOfflineRenderers);
g_support_renderer_switching = true;
}
if (GetGLImplementation() == kGLImplementationAppleGL) {
attribs.push_back(kCGLPFARendererID);
attribs.push_back((CGLPixelFormatAttribute) kCGLRendererGenericFloatID);
g_support_renderer_switching = false;
}
if (GetGLImplementation() == kGLImplementationDesktopGLCoreProfile) {
// These constants don't exist in the 10.6 SDK against which
// Chromium currently compiles.
const int kOpenGLProfile = 99;
const int kOpenGL3_2Core = 0x3200;
attribs.push_back(static_cast<CGLPixelFormatAttribute>(kOpenGLProfile));
attribs.push_back(static_cast<CGLPixelFormatAttribute>(kOpenGL3_2Core));
}
attribs.push_back((CGLPixelFormatAttribute) 0);
GLint num_virtual_screens;
if (CGLChoosePixelFormat(&attribs.front(),
&format,
&num_virtual_screens) != kCGLNoError) {
LOG(ERROR) << "Error choosing pixel format.";
return nullptr;
}
if (!format) {
LOG(ERROR) << "format == 0.";
return nullptr;
}
DCHECK_NE(num_virtual_screens, 0);
return format;
}
GLContextCGL::GLContextCGL(GLShareGroup* share_group)
: GLContextReal(share_group),
context_(nullptr),
gpu_preference_(PreferIntegratedGpu),
discrete_pixelformat_(nullptr),
screen_(-1),
renderer_id_(-1),
safe_to_force_gpu_switch_(true) {
}
bool GLContextCGL::Initialize(GLSurface* compatible_surface,
GpuPreference gpu_preference) {
DCHECK(compatible_surface);
gpu_preference = ui::GpuSwitchingManager::GetInstance()->AdjustGpuPreference(
gpu_preference);
GLContextCGL* share_context = share_group() ?
static_cast<GLContextCGL*>(share_group()->GetContext()) : nullptr;
CGLPixelFormatObj format = GetPixelFormat();
if (!format)
return false;
// If using the discrete gpu, create a pixel format requiring it before we
// create the context.
if (!ui::GpuSwitchingManager::GetInstance()->SupportsDualGpus() ||
gpu_preference == PreferDiscreteGpu) {
std::vector<CGLPixelFormatAttribute> discrete_attribs;
discrete_attribs.push_back((CGLPixelFormatAttribute) 0);
GLint num_pixel_formats;
if (CGLChoosePixelFormat(&discrete_attribs.front(),
&discrete_pixelformat_,
&num_pixel_formats) != kCGLNoError) {
LOG(ERROR) << "Error choosing pixel format.";
return false;
}
// The renderer might be switched after this, so ignore the saved ID.
share_group()->SetRendererID(-1);
}
CGLError res = CGLCreateContext(
format,
share_context ?
static_cast<CGLContextObj>(share_context->GetHandle()) : nullptr,
reinterpret_cast<CGLContextObj*>(&context_));
if (res != kCGLNoError) {
LOG(ERROR) << "Error creating context.";
Destroy();
return false;
}
gpu_preference_ = gpu_preference;
// Contexts that prefer integrated gpu are known to use only the subset of GL
// that can be safely migrated between the iGPU and the dGPU. Mark those
// contexts as safe to forcibly transition between the GPUs by default.
// http://crbug.com/180876, http://crbug.com/227228
safe_to_force_gpu_switch_ = gpu_preference == PreferIntegratedGpu;
return true;
}
void GLContextCGL::Destroy() {
if (discrete_pixelformat_) {
if (base::MessageLoop::current() != nullptr) {
// Delay releasing the pixel format for 10 seconds to reduce the number of
// unnecessary GPU switches.
base::MessageLoop::current()->PostDelayedTask(
FROM_HERE, base::Bind(&CGLReleasePixelFormat, discrete_pixelformat_),
base::TimeDelta::FromSeconds(10));
} else {
CGLReleasePixelFormat(discrete_pixelformat_);
}
discrete_pixelformat_ = nullptr;
}
if (context_) {
CGLDestroyContext(static_cast<CGLContextObj>(context_));
context_ = nullptr;
}
}
bool GLContextCGL::ForceGpuSwitchIfNeeded() {
DCHECK(context_);
// The call to CGLSetVirtualScreen can hang on some AMD drivers
// http://crbug.com/227228
if (safe_to_force_gpu_switch_) {
int renderer_id = share_group()->GetRendererID();
int screen;
CGLGetVirtualScreen(static_cast<CGLContextObj>(context_), &screen);
if (g_support_renderer_switching &&
!discrete_pixelformat_ && renderer_id != -1 &&
(screen != screen_ || renderer_id != renderer_id_)) {
// Attempt to find a virtual screen that's using the requested renderer,
// and switch the context to use that screen. Don't attempt to switch if
// the context requires the discrete GPU.
CGLPixelFormatObj format = GetPixelFormat();
int virtual_screen_count;
if (CGLDescribePixelFormat(format, 0, kCGLPFAVirtualScreenCount,
&virtual_screen_count) != kCGLNoError)
return false;
for (int i = 0; i < virtual_screen_count; ++i) {
int screen_renderer_id;
if (CGLDescribePixelFormat(format, i, kCGLPFARendererID,
&screen_renderer_id) != kCGLNoError)
return false;
screen_renderer_id &= kCGLRendererIDMatchingMask;
if (screen_renderer_id == renderer_id) {
CGLSetVirtualScreen(static_cast<CGLContextObj>(context_), i);
screen_ = i;
break;
}
}
renderer_id_ = renderer_id;
}
}
return true;
}
bool GLContextCGL::MakeCurrent(GLSurface* surface) {
DCHECK(context_);
if (!ForceGpuSwitchIfNeeded())
return false;
if (IsCurrent(surface))
return true;
ScopedReleaseCurrent release_current;
TRACE_EVENT0("gpu", "GLContextCGL::MakeCurrent");
if (CGLSetCurrentContext(
static_cast<CGLContextObj>(context_)) != kCGLNoError) {
LOG(ERROR) << "Unable to make gl context current.";
return false;
}
// Set this as soon as the context is current, since we might call into GL.
SetRealGLApi();
SetCurrent(surface);
if (!InitializeDynamicBindings()) {
return false;
}
if (!surface->OnMakeCurrent(this)) {
LOG(ERROR) << "Unable to make gl context current.";
return false;
}
release_current.Cancel();
return true;
}
void GLContextCGL::ReleaseCurrent(GLSurface* surface) {
if (!IsCurrent(surface))
return;
SetCurrent(nullptr);
CGLSetCurrentContext(nullptr);
}
bool GLContextCGL::IsCurrent(GLSurface* surface) {
bool native_context_is_current = CGLGetCurrentContext() == context_;
// If our context is current then our notion of which GLContext is
// current must be correct. On the other hand, third-party code
// using OpenGL might change the current context.
DCHECK(!native_context_is_current || (GetRealCurrent() == this));
if (!native_context_is_current)
return false;
return true;
}
void* GLContextCGL::GetHandle() {
return context_;
}
void GLContextCGL::OnSetSwapInterval(int interval) {
DCHECK(IsCurrent(nullptr));
}
void GLContextCGL::SetSafeToForceGpuSwitch() {
safe_to_force_gpu_switch_ = true;
}
GLContextCGL::~GLContextCGL() {
Destroy();
}
GpuPreference GLContextCGL::GetGpuPreference() {
return gpu_preference_;
}
} // namespace gfx
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