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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 <GL/osmesa.h>
#include <algorithm>
#include "base/logging.h"
#include "ui/gfx/gl/gl_bindings.h"
#include "ui/gfx/gl/gl_context_osmesa.h"
namespace gfx {
GLContextOSMesa::GLContextOSMesa(GLSurfaceOSMesa* surface)
: surface_(surface),
context_(NULL)
{
}
GLContextOSMesa::~GLContextOSMesa() {
}
bool GLContextOSMesa::Initialize(GLuint format, GLContext* shared_context) {
DCHECK(!context_);
OSMesaContext shared_handle = NULL;
if (shared_context)
shared_handle = static_cast<OSMesaContext>(shared_context->GetHandle());
context_ = OSMesaCreateContextExt(format,
24, // depth bits
8, // stencil bits
0, // accum bits
shared_handle);
if (!context_) {
LOG(ERROR) << "OSMesaCreateContextExt failed.";
return false;
}
return true;
}
void GLContextOSMesa::Destroy() {
if (context_) {
OSMesaDestroyContext(static_cast<OSMesaContext>(context_));
context_ = NULL;
}
surface_->Destroy();
surface_.reset();
}
bool GLContextOSMesa::MakeCurrent() {
DCHECK(context_);
gfx::Size size = surface_->GetSize();
if (!OSMesaMakeCurrent(static_cast<OSMesaContext>(context_),
surface_->GetHandle(),
GL_UNSIGNED_BYTE,
size.width(), size.height())) {
return false;
}
// Row 0 is at the top.
OSMesaPixelStore(OSMESA_Y_UP, 0);
return true;
}
bool GLContextOSMesa::IsCurrent() {
DCHECK(context_);
return context_ == OSMesaGetCurrentContext();
}
bool GLContextOSMesa::IsOffscreen() {
// TODO(apatrick): remove this from GLContext interface.
return surface_->IsOffscreen();
}
bool GLContextOSMesa::SwapBuffers() {
// TODO(apatrick): remove this from GLContext interface.
return surface_->SwapBuffers();
}
gfx::Size GLContextOSMesa::GetSize() {
// TODO(apatrick): remove this from GLContext interface.
return surface_->GetSize();
}
void* GLContextOSMesa::GetHandle() {
return context_;
}
void GLContextOSMesa::SetSwapInterval(int interval) {
DCHECK(IsCurrent());
NOTREACHED() << "Attempt to call SetSwapInterval on an GLContextOSMesa.";
}
} // namespace gfx
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