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// Copyright (c) 2011 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/gfx/gl/gl_context_cgl.h"
#include "base/logging.h"
#include "ui/gfx/gl/gl_bindings.h"
#include "ui/gfx/gl/gl_surface_cgl.h"
namespace gfx {
GLContextCGL::GLContextCGL(GLShareGroup* share_group)
: GLContext(share_group),
context_(NULL) {
}
GLContextCGL::~GLContextCGL() {
Destroy();
}
bool GLContextCGL::Initialize(GLSurface* compatible_surface) {
DCHECK(compatible_surface);
CGLError res = CGLCreateContext(
static_cast<CGLPixelFormatObj>(GLSurfaceCGL::GetPixelFormat()),
share_group() ?
static_cast<CGLContextObj>(share_group()->GetHandle()) : NULL,
reinterpret_cast<CGLContextObj*>(&context_));
if (res != kCGLNoError) {
LOG(ERROR) << "Error creating context.";
Destroy();
return false;
}
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;
if (CGLSetPBuffer(static_cast<CGLContextObj>(context_),
static_cast<CGLPBufferObj>(surface->GetHandle()),
0,
0,
0) != kCGLNoError) {
LOG(ERROR) << "Error attaching pbuffer to context.";
Destroy();
return false;
}
if (CGLSetCurrentContext(
static_cast<CGLContextObj>(context_)) != kCGLNoError) {
LOG(ERROR) << "Unable to make gl context current.";
return false;
}
return true;
}
void GLContextCGL::ReleaseCurrent(GLSurface* surface) {
if (!IsCurrent(surface))
return;
CGLSetCurrentContext(NULL);
CGLSetPBuffer(static_cast<CGLContextObj>(context_), NULL, 0, 0, 0);
}
bool GLContextCGL::IsCurrent(GLSurface* surface) {
if (CGLGetCurrentContext() != context_)
return false;
if (surface) {
CGLPBufferObj current_surface = NULL;
GLenum face;
GLint level;
GLint screen;
CGLGetPBuffer(static_cast<CGLContextObj>(context_),
¤t_surface,
&face,
&level,
&screen);
if (current_surface != surface->GetHandle())
return false;
}
return true;
}
void* GLContextCGL::GetHandle() {
return context_;
}
void GLContextCGL::SetSwapInterval(int interval) {
DCHECK(IsCurrent(NULL));
LOG(WARNING) << "GLContex: GLContextCGL::SetSwapInterval is ignored.";
}
} // namespace gfx
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