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# hwRefractReflectShader_NV20.h

    #ifndef _hwRefractReflectShader_NV20
    #define _hwRefractReflectShader_NV20

    //-
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    // rights reserved.
    //
    // The coded instructions, statements, computer programs, and/or related
    // material (collectively the "Data") in these files contain unpublished
    // information proprietary to Autodesk, Inc. ("Autodesk") and/or its
    // licensors, which is protected by U.S. and Canadian federal copyright
    // law and by international treaties.
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    // to use, modify, and incorporate this Data into other products for
    // purposes authorized by the Autodesk software license agreement,
    // without fee.
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    // The copyright notices in the Software and this entire statement,
    // including the above license grant, this restriction and the
    // following disclaimer, must be included in all copies of the
    // Software, in whole or in part, and all derivative works of
    // the Software, unless such copies or derivative works are solely
    // in the form of machine-executable object code generated by a
    // source language processor.
    //
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    //
    // NOTE: PLEASE READ THE README.TXT FILE FOR INSTRUCTIONS ON
    // COMPILING AND USAGE REQUIREMENTS.
    //
    // DESCRIPTION: NV20-specific (Geforce3) sample shader.
    //              <fill up later>
    //
    //  This shader builds on the foundation demonstrated in the
    //  hwUnlitShader.
    //
    //

    #include <maya/MPxHwShaderNode.h>
    #include "MTextureCache.h"

    class hwRefractReflectShader_NV20 : public MPxHwShaderNode
    {
    public:
                        hwRefractReflectShader_NV20();
        virtual         ~hwRefractReflectShader_NV20();
        void            releaseEverything();

        virtual MStatus compute( const MPlug&, MDataBlock& );
        virtual void    postConstructor();

        virtual MStatus geometry( const MDrawRequest& request,
                                  M3dView& view,
                                  int prim,
                                  unsigned int writable,
                                  int indexCount,
                                  const unsigned int * indexArray,
                                  int vertexCount,
                                  const int * vertexIDs,
                                  const float * vertexArray,
                                  int normalCount,
                                  const float ** normalArrays,
                                  int colorCount,
                                  const float ** colorArrays,
                                  int texCoordCount,
                                  const float ** texCoordArrays);

        virtual int     normalsPerVertex();
        virtual int     texCoordsPerVertex();
        static  void *  creator();
        static  MStatus initialize();
        static  MTypeId id;

        MTextureCache   *m_pTextureCache;

        void            loadVertexProgramGL( M3dView& view );
        float*          computeBinormals(int indexCount, const unsigned int * indexArray,
                                         int vertexCount, const float* vertexArray,
                                         const float* normalsArray,
                                         const float* texCoordsArray);

    protected:

        void        init_ext(const char *ext);

        MStatus     loadTextures(const MDrawRequest& request, M3dView& view);
        void        initCombiners(const MDrawRequest& request, M3dView& view);

        MStatus     preDraw (const MDrawRequest& request, M3dView& view);
        MStatus     postDraw(const MDrawRequest& request, M3dView& view);

        static MObject  colorR;
        static MObject  colorG;
        static MObject  colorB;
        static MObject  color;

        static MObject  refractionIndex;
        static MObject  reflectivity;

        // Callbacks that we monitor so we can release OpenGL-dependant resources before
        // their context gets destroyed.
        MCallbackId fBeforeNewCB;
        MCallbackId fBeforeOpenCB;
        MCallbackId fBeforeRemoveReferenceCB;
        MCallbackId fMayaExitingCB;

        void attachSceneCallbacks();
        void detachSceneCallbacks();
        static void releaseCallback(void* clientData);

    private:

        // Images to store the cubeMap texture names
        //
        MImage theImage_XP;
        MImage theImage_XN;
        MImage theImage_YP;
        MImage theImage_YN;
        MImage theImage_ZP;
        MImage theImage_ZN;

        GLuint  vertex_program_id;      // handle for the Vertex Program
        GLuint  fTextureName;           // texture name
        MString currentTextureNames[6]; // cubemap file texture names

        float   fRefractionIndex;
        float   fReflectivity;

        MVector fCameraRotationAxis;
        double  fCameraRotationAngle;
    };

    #endif /* _hwRefractReflectShader_NV20 */