glslShader/crackFreePrimitiveGenerator.h

//-
// ==========================================================================
// Copyright 2015 Autodesk, Inc.  All rights reserved.
//
// Use of this software is subject to the terms of the Autodesk
// license agreement provided at the time of installation or download,
// or which otherwise accompanies this software in either electronic
// or hard copy form.
// ==========================================================================
//+

// Example plugin: crackFreePrimitiveGenerator.cpp
//
// This plug-in is an example of a custom MPxIndexBufferMutator.
// It provides custom primitives based on shader requirements coming from 
// an MPxShaderOverride.  The name() in the MIndexBufferDescriptor is used 
// to signify a unique identifier for a custom buffer.

#include <maya/MPxIndexBufferMutator.h>

class CrackFreePrimitiveGenerator : public MHWRender::MPxIndexBufferMutator
{
public:
    CrackFreePrimitiveGenerator(bool addAdjacentEdges, bool addDominantEdges, bool addDominantPosition);
    ~CrackFreePrimitiveGenerator() override;

    MHWRender::MGeometry::Primitive mutateIndexing(const MHWRender::MComponentDataIndexingList& sourceIndexBuffers, 
        const MHWRender::MVertexBufferArray& vertexBuffers,
        MHWRender::MIndexBuffer& mutatedBuffer,
        int& primitiveStride) const override;

    // This will allow cleaning up the swatch for PNAEN geometries:
    static void mutateIndexBuffer( const MUintArray& originalBufferIndices, 
                        const float* positionBufferFloat, 
                        const float* uvBufferFloat, 
                        bool bAddAdjacentEdges,
                        bool bAddDominantEdges,
                        bool bAddDominantPosition,
                        MHWRender::MGeometry::DataType indexBufferDataType,
                        void* indexData );

    static unsigned int computeTriangleSize( bool bAddAdjacentEdges,
                            bool bAddDominantEdges,
                            bool bAddDominantPosition);

    static MHWRender::MPxIndexBufferMutator* createCrackFreePrimitiveGenerator18();
    static MHWRender::MPxIndexBufferMutator* createCrackFreePrimitiveGenerator9();

private:
    bool fAddAdjacentEdges;
    bool fAddDominantEdges;
    bool fAddDominantPosition;
};