/*

 * 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 WebGLTexture_h

#define WebGLTexture_h

#include "CanvasObject.h"

#include <wtf/PassRefPtr.h>

#include <wtf/RefCounted.h>

#include <wtf/Vector.h>

namespace WebCore {

    class WebGLTexture : public CanvasObject {

    public:

        virtual ~WebGLTexture() { deleteObject(); }

        static PassRefPtr<WebGLTexture> create(WebGLRenderingContext*);

        bool isCubeMapRWrapModeInitialized() {

            return cubeMapRWrapModeInitialized;

        }

        void setCubeMapRWrapModeInitialized(bool initialized) {

            cubeMapRWrapModeInitialized = initialized;

        }

        void setTarget(unsigned long target, int maxLevel);

        void setParameteri(unsigned long pname, int param);

        void setParameterf(unsigned long pname, float param);

        void setLevelInfo(unsigned long target, int level, unsigned long internalFormat, int width, int height, unsigned long type);

        bool canGenerateMipmaps();

        // Generate all level information.

        void generateMipmapLevelInfo();

        unsigned long getInternalFormat() const;

        // Whether width/height is NotPowerOfTwo.

        static bool isNPOT(unsigned, unsigned);

        bool isNPOT() const;

        // Determine if texture sampling should always return [0, 0, 0, 1] (OpenGL ES 2.0 Sec 3.8.2).

        bool needToUseBlackTexture() const;

        static int computeLevelCount(int width, int height);

    protected:

        WebGLTexture(WebGLRenderingContext*);

        virtual void _deleteObject(Platform3DObject);

    private:

        virtual bool isTexture() const { return true; }

        void update();

        int mapTargetToIndex(unsigned long);

        bool cubeMapRWrapModeInitialized;

        unsigned long m_target;

        int m_minFilter;

        int m_magFilter;

        int m_wrapS;

        int m_wrapT;

        class LevelInfo {

        public:

            LevelInfo()

                : valid(false)

                , internalFormat(0)

                , width(0)

                , height(0)

                , type(0)

            {

            }

            void setInfo(unsigned long internalFmt, int w, int h, unsigned long tp)

            {

                valid = true;

                internalFormat = internalFmt;

                width = w;

                height = h;

                type = tp;

            }

            bool valid;

            unsigned long internalFormat;

            int width;

            int height;

            unsigned long type;

        };

        Vector<Vector<LevelInfo> > m_info;

        bool m_isNPOT;

        bool m_isComplete;

        bool m_needToUseBlackTexture;

    };

} // namespace WebCore

#endif // WebGLTexture_h