/*
 * 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
