GR/GR_AttribOffset.h

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/*
 * PROPRIETARY INFORMATION.  This software is proprietary to
 * Side Effects Software Inc., and is not to be reproduced,
 * transmitted, or disclosed in any way without written permission.
 *
 * Produced by:
 *      Side Effects Software Inc.
 *      477 Richmond Street West
 *      Toronto, Ontario
 *      Canada   M5V 3E7
 *      416-504-9876
 *
 * NAME:        GR_ShadedOffset.h (GR library, C++)
 *
 * COMMENTS:    Attribute offsets specifically for GR
 *
 */

#ifndef __GR_AttribOffset_h__
#define __GR_AttribOffset_h__

#include "GR_API.h"
#include <UT/UT_IntArray.h>
#include <GU/GU_DisplayAttribs.h>

class RE_Material;
class GR_DisplayOption;

class GR_API GR_AttribOffset : public GU_DisplayAttribs
{
public:
    typedef const float *(*ColorLookupFunc)(const void *data);

    GR_AttribOffset();

    GR_AttribOffset(const GR_AttribOffset &copy);
    GR_AttribOffset &operator=(const GR_AttribOffset &copy);

    // This function overrides the base class version.
    // It's non-virtual for efficiency as we don't use this class in a
    // polymorphic fashion.
    void        resetOffsets();

    void        getShaderAttribOffsets(const GU_Detail *gdp,
                                       const RE_Material *mat);

    void        getLookups(const GU_Detail *gdp, const GR_DisplayOption &dopt);

    // Query whether we have vertex level colors.  This includes both point
    // and vertex attributes.
    inline bool hasVertexColors() const
                    { return ptCd >= 0 || vtxCd >= 0 ||
                        ptColorLookupOffset >= 0 || vtxColorLookupOffset >= 0; }

    // OpenGL shaders.
    UT_IntArray ptLocations;    // OpenGL shader attribute offsets
    UT_IntArray ptOffsets;      // Corresponding gdp attribute offsets
    UT_IntArray ptSizes;        // Corresponding gdp attribute sizes
    UT_IntArray vtxLocations;   // OpenGL shader (vertex) attribute offsets
    UT_IntArray vtxOffsets;     // Corresponding gdp (vertex) attribute offsets
    UT_IntArray vtxSizes;       // Corresponding gdp (vertex) attribute sizes

    ColorLookupFunc     colorLookup;
    int                 ptColorLookupOffset;
    int                 vtxColorLookupOffset;

private:
};

#endif // __GR_AttribOffset_h__

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