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# geomShader.cpp

    //-
    // ==========================================================================
    // Copyright 1995,2006,2008 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.
    // ==========================================================================
    //+

    //
    // DESCRIPTION:
    //

    #include <maya/MPxNode.h>
    #include <maya/MIOStream.h>
    #include <maya/MString.h>
    #include <maya/MTypeId.h>
    #include <maya/MPlug.h>
    #include <maya/MDataBlock.h>
    #include <maya/MDataHandle.h>
    #include <maya/MFnNumericAttribute.h>
    #include <maya/MFloatVector.h>
    #include <maya/MFnPlugin.h>

    //
    // DESCRIPTION:
    class GeomNode : public MPxNode
    {
        public:
                         GeomNode();
       virtual           ~GeomNode();

       virtual MStatus   compute( const MPlug&, MDataBlock& );
       virtual void      postConstructor();

       static  void *    creator();
       static  MStatus   initialize();

        //  Id tag for use with binary file format
       static  MTypeId   id;

        private:

        // Input attributes
        static MObject aPoint;
        static MObject aScale;
        static MObject aOffset;

        // Output attributes
        static MObject aOutColor;
    };

    // static data
    MTypeId GeomNode::id( 0x81004 );

    // Attributes
    MObject  GeomNode::aPoint;
    MObject  GeomNode::aScale;
    MObject  GeomNode::aOffset;
    MObject  GeomNode::aOutColor;

    #define MAKE_INPUT(attr)                                \
      CHECK_MSTATUS ( attr.setKeyable(true) );              \
      CHECK_MSTATUS ( attr.setStorable(true) );             \
      CHECK_MSTATUS ( attr.setReadable(true) );             \
      CHECK_MSTATUS ( attr.setWritable(true) );

    #define MAKE_OUTPUT(attr)                               \
      CHECK_MSTATUS (attr.setKeyable(false) );              \
      CHECK_MSTATUS ( attr.setStorable(false));             \
      CHECK_MSTATUS ( attr.setReadable(true) );             \
      CHECK_MSTATUS ( attr.setWritable(false));

    // DESCRIPTION:
    //
    void GeomNode::postConstructor( )
    {
        setMPSafe(true);
    }

    // DESCRIPTION:
    //
    GeomNode::GeomNode()
    {
    }

    // DESCRIPTION:
    //
    GeomNode::~GeomNode()
    {
    }

    // DESCRIPTION:
    //
    void* GeomNode::creator()
    {
        return new GeomNode();
    }

    // DESCRIPTION:
    //
    MStatus GeomNode::initialize()
    {
        MFnNumericAttribute nAttr;

        // Input attributes

        aPoint = nAttr.createPoint( "pointObj", "p" );
        CHECK_MSTATUS ( nAttr.setStorable(false) );
        CHECK_MSTATUS ( nAttr.setHidden(true) );

        aScale = nAttr.createPoint( "scale", "s" );
        MAKE_INPUT(nAttr);
        CHECK_MSTATUS ( nAttr.setDefault(1.0f, 1.0f, 1.0f) );

        aOffset = nAttr.createPoint( "offset", "o" );
        MAKE_INPUT(nAttr);

        // Output attributes
        aOutColor  = nAttr.createColor( "outColor", "oc" );
        MAKE_OUTPUT(nAttr);

        // Add attributes to the node database.
        CHECK_MSTATUS ( addAttribute(aPoint) );
        CHECK_MSTATUS ( addAttribute(aScale) );
        CHECK_MSTATUS ( addAttribute(aOffset) );

        CHECK_MSTATUS ( addAttribute(aOutColor) );

        // All input affect the output color
        CHECK_MSTATUS ( attributeAffects (aPoint, aOutColor) );
        CHECK_MSTATUS ( attributeAffects (aScale, aOutColor) );
        CHECK_MSTATUS ( attributeAffects (aOffset,aOutColor) );

        return MS::kSuccess;
    }

    // DESCRIPTION:
    //
    MStatus GeomNode::compute(
    const MPlug&      plug,
          MDataBlock& block )
    {
        // outColor or individial R, G, B channel
        if((plug != aOutColor) && (plug.parent() != aOutColor))
            return MS::kUnknownParameter;

        MFloatVector resultColor;

        MFloatVector & point  = block.inputValue( aPoint ).asFloatVector();
        MFloatVector & scale  = block.inputValue( aScale ).asFloatVector();
        MFloatVector & offset = block.inputValue( aOffset ).asFloatVector();

        // Scale + Offset original geometry position
        resultColor.x = point.x * scale.x + offset.x;
        resultColor.y = point.y * scale.y + offset.y;
        resultColor.z = point.z * scale.z + offset.z;

        // set ouput color attribute
        MDataHandle outColorHandle = block.outputValue( aOutColor );
        MFloatVector& outColor = outColorHandle.asFloatVector();
        outColor = resultColor;
        outColorHandle.setClean();

        return MS::kSuccess;
    }

    //
    // DESCRIPTION:
    MStatus initializePlugin( MObject obj )
    {
       const MString UserClassify( "utility/general" );

       MFnPlugin plugin( obj, PLUGIN_COMPANY, "4.5", "Any");
       CHECK_MSTATUS ( plugin.registerNode( "geomNode", GeomNode::id,
                             GeomNode::creator, GeomNode::initialize,
                             MPxNode::kDependNode, &UserClassify ) );

       return MS::kSuccess;
    }

    //
    // DESCRIPTION:
    MStatus uninitializePlugin( MObject obj )
    {
       MFnPlugin plugin( obj );
       CHECK_MSTATUS ( plugin.deregisterNode( GeomNode::id ) );

       return MS::kSuccess;
    }