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# PtexExtractor/ptex/PtexTriangleFilter.h

    #ifndef PtexTriangleFilter_h
    #define PtexTriangleFilter_h

    /*
    PTEX SOFTWARE
    Copyright 2009 Disney Enterprises, Inc.  All rights reserved

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions are
    met:

      * Redistributions of source code must retain the above copyright
        notice, this list of conditions and the following disclaimer.

      * Redistributions in binary form must reproduce the above copyright
        notice, this list of conditions and the following disclaimer in
        the documentation and/or other materials provided with the
        distribution.

      * The names "Disney", "Walt Disney Pictures", "Walt Disney Animation
        Studios" or the names of its contributors may NOT be used to
        endorse or promote products derived from this software without
        specific prior written permission from Walt Disney Pictures.

    Disclaimer: THIS SOFTWARE IS PROVIDED BY WALT DISNEY PICTURES AND
    CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
    BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
    FOR A PARTICULAR PURPOSE, NONINFRINGEMENT AND TITLE ARE DISCLAIMED.
    IN NO EVENT SHALL WALT DISNEY PICTURES, THE COPYRIGHT HOLDER OR
    CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND BASED ON ANY
    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
    OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
    */

    #include "Ptexture.h"
    class PtexTriangleKernel;
    class PtexTriangleKernelIter;

    class PtexTriangleFilter : public PtexFilter, public Ptex
    {
     public:
        PtexTriangleFilter(PtexTexture* tx, const PtexFilter::Options& opts ) :
        _tx(tx), _options(opts), _result(0), _weight(0),
        _firstChanOffset(0), _nchan(0), _ntxchan(0),
        _dt((DataType)0) {}
        virtual void release() { delete this; }
        virtual void eval(float* result, int firstchan, int nchannels,
                  int faceid, float u, float v,
                  float uw1, float vw1, float uw2, float vw2,
                  float width, float blur);

     protected:
        void buildKernel(PtexTriangleKernel& k, float u, float v,
                 float uw1, float vw1, float uw2, float vw2,
                 float width, float blur, Res faceRes);

        void splitAndApply(PtexTriangleKernel& k, int faceid, const Ptex::FaceInfo& f);
        void applyAcrossEdge(PtexTriangleKernel& k, const Ptex::FaceInfo& f, int eid);
        void apply(PtexTriangleKernel& k, int faceid, const Ptex::FaceInfo& f);
        void applyIter(PtexTriangleKernelIter& k, PtexFaceData* dh);

        virtual ~PtexTriangleFilter() {}

        PtexTexture* _tx;       // texture being evaluated
        Options _options;       // options
        double* _result;        // temp result
        double _weight;     // accumulated weight of data in _result
        int _firstChanOffset;   // byte offset of first channel to eval
        int _nchan;         // number of channels to eval
        int _ntxchan;       // number of channels in texture
        DataType _dt;       // data type of texture
    };

    #endif