//
//     Copyright (C) Pixar. All rights reserved.
//
//     This license governs use of the accompanying software. If you
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//     the license, do not use the software.
//
//     1. Definitions
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//     "distribution" have the same meaning here as under U.S.
//     copyright law.  A "contribution" is the original software, or
//     any additions or changes to the software.
//     A "contributor" is any person or entity that distributes its
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//     directly on its contribution.
//
//     2. Grant of Rights
//     (A) Copyright Grant- Subject to the terms of this license,
//     including the license conditions and limitations in section 3,
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//
//     3. Conditions and Limitations
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//     patents that you claim are infringed by the software, your
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//     (E) The software is licensed "as-is." You bear the risk of
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//     rights under your local laws which this license cannot change.
//     To the extent permitted under your local laws, the contributors
//     exclude the implied warranties of merchantability, fitness for
//     a particular purpose and non-infringement.
//
#ifndef OSD_CPU_KERNEL_H
#define OSD_CPU_KERNEL_H

namespace OpenSubdiv {
namespace OPENSUBDIV_VERSION {

struct VertexDescriptor {

    VertexDescriptor(int numVertexElem, int numVaryingElem) 
        : numVertexElements(numVertexElem), numVaryingElements(numVaryingElem) { }

    void Clear(float *vertex, float *varying) const {
        for (int i = 0; i < numVertexElements; ++i)
            vertex[i] = 0.0f;

        for (int i = 0; i < numVaryingElements; ++i)
            varying[i] = 0.0f;
    }
    void AddWithWeight(float *vertex, const float *src, float weight) const {
        for (int i = 0; i < numVertexElements; ++i)
            vertex[i] += src[i] * weight;
    }
    void AddVaryingWithWeight(float *varying, const float *src, float weight) const {
        for (int i = 0; i < numVaryingElements; ++i)
            varying[i] += src[i] * weight;
    }
    
    int numVertexElements;
    int numVaryingElements;
};

extern void computeFace(const VertexDescriptor *vdesc, float * vertex, float * varying,
                        const int *F_IT, const int *F_ITa, int offset, int start, int end);
extern void computeEdge(const VertexDescriptor *vdesc, float *vertex, float * varying,
                        const int *E_IT, const float *E_W, int offset, int start, int end);
extern void computeVertexA(const VertexDescriptor *vdesc, float *vertex, float * varying,
                           const int *V_ITa, const float *V_W,
                           int offset, int start, int end, int pass);
extern void computeVertexB(const VertexDescriptor *vdesc, float *vertex, float * varying,
                           const int *V_ITa, const int *V_IT, const float *V_W,
                           int offset, int start, int end);
extern void computeLoopVertexB(const VertexDescriptor *vdesc, float *vertex, float * varying,
                               const int *V_ITa, const int *V_IT, const float *V_W,
                               int offset, int start, int end);

} // end namespace OPENSUBDIV_VERSION
using namespace OPENSUBDIV_VERSION;

} // end namespace OpenSubdiv

#endif /* OSD_CPU_KERNEL_H */