/*
 * Copyright (C) 2010 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */


#ifndef CanvasLayerChromium_h
#define CanvasLayerChromium_h

#if USE(ACCELERATED_COMPOSITING)

#include "LayerChromium.h"

namespace WebCore {

// Base class for WebGL and accelerated 2d canvases.
class CanvasLayerChromium : public LayerChromium {
public:
    virtual ~CanvasLayerChromium();

    virtual void draw();

    class SharedValues {
    public:
        explicit SharedValues(GraphicsContext3D*);
        ~SharedValues();

        unsigned canvasShaderProgram() const { return m_canvasShaderProgram; }
        int shaderSamplerLocation() const { return m_shaderSamplerLocation; }
        int shaderMatrixLocation() const { return m_shaderMatrixLocation; }
        int shaderAlphaLocation() const { return m_shaderAlphaLocation; }
        bool initialized() const { return m_initialized; }

    private:
        GraphicsContext3D* m_context;
        unsigned m_canvasShaderProgram;
        int m_shaderSamplerLocation;
        int m_shaderMatrixLocation;
        int m_shaderAlphaLocation;
        bool m_initialized;
    };

protected:
    explicit CanvasLayerChromium(GraphicsLayerChromium* owner);
    bool m_textureChanged;
    unsigned m_textureId;

private:
    static unsigned m_shaderProgramId;
};

}
#endif // USE(ACCELERATED_COMPOSITING)

#endif // CanvasLayerChromium_h