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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 <vector>
#include "base/debug/trace_event.h"
#include "base/logging.h"
#include "ui/gl/gl_bindings.h"
#include "ui/gl/gl_implementation.h"
#include "ui/gl/gl_surface_cgl.h"
namespace gfx {
GLContextCGL::GLContextCGL(GLShareGroup* share_group)
: GLContext(share_group),
context_(NULL),
gpu_preference_(PreferIntegratedGpu) {
}
bool GLContextCGL::Initialize(GLSurface* compatible_surface,
GpuPreference gpu_preference) {
DCHECK(compatible_surface);
GLContextCGL* share_context = share_group() ?
static_cast<GLContextCGL*>(share_group()->GetContext()) : NULL;
if (SupportsDualGpus()) {
// Ensure the GPU preference is compatible with contexts already in the
// share group.
if (share_context && gpu_preference != share_context->GetGpuPreference())
return false;
}
std::vector<CGLPixelFormatAttribute> attribs;
bool using_offline_renderer =
SupportsDualGpus() && gpu_preference == PreferIntegratedGpu;
if (using_offline_renderer) {
attribs.push_back(kCGLPFAAllowOfflineRenderers);
}
if (GetGLImplementation() == kGLImplementationAppleGL) {
attribs.push_back(kCGLPFARendererID);
attribs.push_back((CGLPixelFormatAttribute) kCGLRendererGenericFloatID);
}
attribs.push_back((CGLPixelFormatAttribute) 0);
CGLPixelFormatObj format;
GLint num_pixel_formats;
if (CGLChoosePixelFormat(&attribs.front(),
&format,
&num_pixel_formats) != kCGLNoError) {
LOG(ERROR) << "Error choosing pixel format.";
return false;
}
if (!format) {
LOG(ERROR) << "format == 0.";
return false;
}
DCHECK_NE(num_pixel_formats, 0);
CGLError res = CGLCreateContext(
format,
share_context ?
static_cast<CGLContextObj>(share_context->GetHandle()) : NULL,
reinterpret_cast<CGLContextObj*>(&context_));
CGLReleasePixelFormat(format);
if (res != kCGLNoError) {
LOG(ERROR) << "Error creating context.";
Destroy();
return false;
}
gpu_preference_ = gpu_preference;
return true;
}
void GLContextCGL::Destroy() {
if (context_) {
CGLDestroyContext(static_cast<CGLContextObj>(context_));
context_ = NULL;
}
}
bool GLContextCGL::MakeCurrent(GLSurface* surface) {
DCHECK(context_);
if (IsCurrent(surface))
return true;
TRACE_EVENT0("gpu", "GLContextCGL::MakeCurrent");
if (CGLSetCurrentContext(
static_cast<CGLContextObj>(context_)) != kCGLNoError) {
LOG(ERROR) << "Unable to make gl context current.";
return false;
}
SetCurrent(this, surface);
if (!InitializeExtensionBindings()) {
ReleaseCurrent(surface);
return false;
}
if (!surface->OnMakeCurrent(this)) {
LOG(ERROR) << "Unable to make gl context current.";
return false;
}
return true;
}
void GLContextCGL::ReleaseCurrent(GLSurface* surface) {
if (!IsCurrent(surface))
return;
SetCurrent(NULL, NULL);
CGLSetCurrentContext(NULL);
}
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 || (GetCurrent() == this));
if (!native_context_is_current)
return false;
return true;
}
void* GLContextCGL::GetHandle() {
return context_;
}
void GLContextCGL::SetSwapInterval(int interval) {
DCHECK(IsCurrent(NULL));
LOG(WARNING) << "GLContex: GLContextCGL::SetSwapInterval is ignored.";
}
GLContextCGL::~GLContextCGL() {
Destroy();
}
GpuPreference GLContextCGL::GetGpuPreference() {
return gpu_preference_;
}
void GLContextCGL::ForceUseOfDiscreteGPU() {
static CGLPixelFormatObj format = NULL;
if (format)
return;
CGLPixelFormatAttribute attribs[1];
attribs[0] = static_cast<CGLPixelFormatAttribute>(0);
GLint num_pixel_formats = 0;
CGLChoosePixelFormat(attribs, &format, &num_pixel_formats);
// format is deliberately leaked.
}
} // namespace gfx
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