hwAnisotropicShader_NV20.h

#ifndef _hwAnisotropicShader_NV20
#define _hwAnisotropicShader_NV20

//-
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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 hwAnisotropicShader_NV20 : public MPxHwShaderNode
{
public:
                    hwAnisotropicShader_NV20();
    virtual         ~hwAnisotropicShader_NV20();
        void                    releaseEverything();

        virtual void    postConstructor();

        virtual MStatus bind(const MDrawRequest& request,
                                                 M3dView& view);

        virtual MStatus unbind(const MDrawRequest& request,
                                                   M3dView& view);

        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();

        bool                    fVertexProgramsLoaded;
        GLuint                  fVertexProgramDirectional;
        GLuint                  fVertexProgramPointDecay;
        GLuint                  fVertexProgramPointNoDecay;

        void                    printGlError( const char *call );

        void                    init_ext(const char *ext);
        MStatus                 getFloat3(MObject colorAttr, float colorValue[3]);
        MStatus                 getString(MObject attr, MString &str);


protected:
        // Make the look-up texture
        void make_lookup_texture();
        // Bind the look-up texture in the current GL texture unit.
        // This function automatically calls make_lookup_texture,
        // and reloads the texture in video memory if it needs to.
        void bind_lookup_table();
        // Release the memory occupied by the look-up texture.
        void release_lookup_texture();

        
        // Attributes for the lighting model 
        //
    static MObject  colorR;
        static MObject  colorG;
        static MObject  colorB;
        static MObject  color;

        static MObject  kDiffuse;
        static MObject  kSpecular;
    static MObject  roughness;

        vec3f                   lightRotation;
        vec3f                   cameraPos;
        boolean                 isDirectionalLight;     // when light's rotation is on the lightPos attr
        boolean                 isNonAmbientLight; // Has a decay rate 

        // Current color, roughness etc used to generate the lookup texture
        // which contains the anisotropic lighting model
        float currentColor[3];
        float currentRoughness;
        float currentKd;
        float currentKs;
        tex_object_2D *lookup_texture;
        unsigned char *lookup_table;
        static const unsigned int lookup_texture_size;
        bool fLookupTextureReprocessed;


        // 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);
};

#endif /* _hwAnisotropicShader_NV20 */