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//
#ifndef OSD_CPU_VERTEX_DESCRIPTOR_H
#define OSD_CPU_VERTEX_DESCRIPTOR_H

#include "../version.h"

namespace OpenSubdiv {
namespace OPENSUBDIV_VERSION {

struct OsdVertexDescriptor {

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

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

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

    void ApplyVertexEditAdd(float *vertex, int primVarOffset, int primVarWidth, int editIndex, const float *editValues) const {
        int d = editIndex * numVertexElements + primVarOffset;
        for (int i = 0; i < primVarWidth; ++i) {
            vertex[d++] += editValues[i];
        }
    }

    void ApplyVertexEditSet(float *vertex, int primVarOffset, int primVarWidth, int editIndex, const float *editValues) const {
        int d = editIndex * numVertexElements + primVarOffset;
        for (int i = 0; i < primVarWidth; ++i) {
            vertex[d++] = editValues[i];
        }
    }

    int numVertexElements;
    int numVaryingElements;
};

struct OsdVertexBufferDescriptor {
    OsdVertexBufferDescriptor()
    : vertexOffset(0), stride(0), elementOffset(0) { }

    OsdVertexBufferDescriptor(int vertexOffset_, int stride_, int elementOffset_)
    : vertexOffset(vertexOffset_), stride(stride_), elementOffset(elementOffset_) { }

    int vertexOffset;
    int stride;
    int elementOffset;
};

} // end namespace OPENSUBDIV_VERSION
using namespace OPENSUBDIV_VERSION;

} // end namespace OpenSubdiv

#endif /* OSD_CPU_VERTEX_DESCRIPTRO_H */