OgreTerrainLayerBlendMap.h

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/*
-----------------------------------------------------------------------------
This source file is part of OGRE
(Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2012 Torus Knot Software Ltd

Permission is hereby granted, free of charge, to any person obtaining a copy
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The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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*/

#ifndef __Ogre_TerrainLayerBlendMap_H__
#define __Ogre_TerrainLayerBlendMap_H__

#include "OgreTerrainPrerequisites.h"
#include "OgreCommon.h"
#include "OgreVector3.h"
#include "OgreDataStream.h"

namespace Ogre
{
    class Image;
    class _OgreTerrainExport TerrainLayerBlendMap : public TerrainAlloc
    {
    protected:
        Terrain* mParent;
        uint8 mLayerIdx;
        uint8 mChannel; // RGBA
        uint8 mChannelOffset; // in pixel format
        Box mDirtyBox;
        bool mDirty;
        HardwarePixelBuffer* mBuffer;
        float* mData;

        void download();
        void upload();

    public:
        TerrainLayerBlendMap(Terrain* parent, uint8 layerIndex, HardwarePixelBuffer* buf);
        ~TerrainLayerBlendMap();
        Terrain* getParent() const { return mParent; }
        uint8 getLayerIndex() const { return mLayerIdx; }

        void convertWorldToUVSpace(const Vector3& worldPos, Real *outX, Real* outY);

        void convertUVToWorldSpace(Real x, Real y, Vector3* outWorldPos);

        void convertUVToImageSpace(Real x, Real y, size_t* outX, size_t* outY);
        void convertImageToUVSpace(size_t x, size_t y, Real* outX, Real* outY);
        void convertImageToTerrainSpace(size_t x, size_t y, Real* outX, Real* outY);
        void convertTerrainToImageSpace(Real x, Real y, size_t* outX, size_t* outY);

        float getBlendValue(size_t x, size_t y);

        void setBlendValue(size_t x, size_t y, float val);

        float* getBlendPointer();

        void dirty();

        void dirtyRect(const Rect& rect);

        void blit(const PixelBox &src, const Box &dstBox);
        
        void blit(const PixelBox &src);

        void loadImage(const Image& img);

        void loadImage(DataStreamPtr& stream, const String& ext = StringUtil::BLANK);

        void loadImage(const String& filename, const String& groupName);

        void update();


    };

    typedef vector<TerrainLayerBlendMap*>::type TerrainLayerBlendMapList;

}



#endif