/*
 * Copyright (C) 2009 Apple 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:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 APPLE COMPUTER, INC. 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, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

#ifndef WebGLProgram_h
#define WebGLProgram_h

#include "CanvasObject.h"

#include <wtf/PassRefPtr.h>
#include <wtf/RefCounted.h>
#include <wtf/Vector.h>

namespace WebCore {
    
    class WebGLProgram : public CanvasObject {
    public:
        virtual ~WebGLProgram() { deleteObject(); }
        
        static PassRefPtr<WebGLProgram> create(WebGLRenderingContext*);

        // cacheActiveAttribLocation() is only called once after linkProgram()
        // succeeds.
        bool cacheActiveAttribLocations();
        int numActiveAttribLocations() const;
        int getActiveAttribLocation(int index) const;

        bool isUsingVertexAttrib0() const;

        // Return true means getProgramParameter(LINK_STATUS) should return
        // false; return false means we should actually call
        // getProgramParameter(LINK_STATUS) to find out.
        bool isLinkFailureFlagSet() const { return m_linkFailure; }
        void setLinkFailureFlag(bool failed) { m_linkFailure = failed; }

    protected:
        WebGLProgram(WebGLRenderingContext*);
        
        virtual void _deleteObject(Platform3DObject);

    private:
        virtual bool isProgram() const { return true; }

        Vector<int> m_activeAttribLocations;

        bool m_linkFailure;
    };
    
} // namespace WebCore

#endif // WebGLProgram_h