hwUnlitShader/hwUnlitShader.h

#ifndef _hwUnlitShader
#define _hwUnlitShader

//-
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//
// NOTE: PLEASE READ THE README.TXT FILE FOR INSTRUCTIONS ON
// COMPILING AND USAGE REQUIREMENTS.
//
// DESCRIPTION: Simple hardware shader which uses regular OpenGL
//              texturing and disables lighting.
//
//  This sample demonstrates how to:
//      - Specify a color attribute on your HW shader plug-in 
//        so that end-users can attach a file texture to it.
//      - Traverse what's upstream of the color attribute, including 
//        going through shading switches if required.
//      - Using the MImage API class to load and uncompress a file 
//        texture in any Maya-supported file format.
//      - Setting up the graphics pipeline to display the 
//        texture correctly.
//
//

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

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

    virtual MStatus compute( const MPlug&, MDataBlock& );
    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 bool    hasTransparency();
    virtual int     texCoordsPerVertex();

    static  void *  creator();
    static  MStatus initialize();
    static  MTypeId id;

    MTextureCache*  m_pTextureCache;

    void            printGlError( const char *call );

    MStatus         getFloat3(MObject colorAttr, float colorValue[3]);
    MStatus         getString(MObject attr, MString &str);

    void            updateTransparencyFlags(MString objectPath);

protected:
    static MObject  colorR;
    static MObject  colorG;
    static MObject  colorB;
    static MObject  color;


    static MObject  transparencyR;
    static MObject  transparencyG;
    static MObject  transparencyB;
    static MObject  transparency;
    float fConstantTransparency;

    MDagPath currentObjectPath;

    // 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 /* _hwUnlitShader */