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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/compositor.h"
#include <GL/gl.h>
#include "app/gfx/gl/gl_context.h"
#include "app/gfx/gl/gl_implementation.h"
#include "base/scoped_ptr.h"
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/logging.h"
#include "ui/gfx/transform.h"
namespace ui {
class CompositorGL : public Compositor {
public:
CompositorGL(gfx::AcceleratedWidget widget);
private:
// Overridden from Compositor.
void NotifyStart() OVERRIDE;
void NotifyEnd() OVERRIDE;
void DrawTextureWithTransform(TextureID txt,
const ui::Transform& transform) OVERRIDE;
void SaveTransform() OVERRIDE;
void RestoreTransform() OVERRIDE;
// The GL context used for compositing.
scoped_ptr<gfx::GLContext> gl_context_;
// Keep track of whether compositing has started or not.
bool started_;
DISALLOW_COPY_AND_ASSIGN(CompositorGL);
};
CompositorGL::CompositorGL(gfx::AcceleratedWidget widget)
: gl_context_(gfx::GLContext::CreateViewGLContext(widget, false)),
started_(false) {
}
void CompositorGL::NotifyStart() {
started_ = true;
gl_context_->MakeCurrent();
}
void CompositorGL::NotifyEnd() {
DCHECK(started_);
gl_context_->SwapBuffers();
started_ = false;
}
void CompositorGL::DrawTextureWithTransform(TextureID txt,
const ui::Transform& transform) {
DCHECK(started_);
// TODO(wjmaclean):
NOTIMPLEMENTED();
}
void CompositorGL::SaveTransform() {
glPushMatrix();
}
void CompositorGL::RestoreTransform() {
glPopMatrix();
}
// static
Compositor* Compositor::Create(gfx::AcceleratedWidget widget) {
if (gfx::GetGLImplementation() != gfx::kGLImplementationNone)
return new CompositorGL(widget);
return NULL;
}
} // namespace ui
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