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# mixtureShader.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.
    // ==========================================================================
    //+

    #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 MixtureNode : public MPxNode
    {
        public:
                        MixtureNode();
        virtual         ~MixtureNode();

        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 aColor1;                 // 1st Input color
        static MObject aColor2;                 // 2nd Input color
        static MObject aAlphaInput1;            // Input Alpha's for 1st color
        static MObject aAlphaInput2;            // Input Alpha's for 2nd color

        // Output attributes
        static MObject aOutColor;               // Output color
    };

    // static data
    MTypeId MixtureNode::id( 0x81007 );

    // Attributes
    MObject MixtureNode::aColor1;
    MObject MixtureNode::aColor2;
    MObject MixtureNode::aAlphaInput1;
    MObject MixtureNode::aAlphaInput2;
    MObject MixtureNode::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 MixtureNode::postConstructor( )
    {
        setMPSafe(true);
    }

    //
    // DESCRIPTION:
    MixtureNode::MixtureNode()
    {
    }

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

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

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

        // Input attributes

        aColor1 = nAttr.createColor( "color1", "c1" );
        MAKE_INPUT(nAttr);
         CHECK_MSTATUS ( nAttr.setDefault(0.0f, 1.0f, 0.0f) );      // Green

        aColor2 = nAttr.createColor( "color2", "c2" );
        MAKE_INPUT(nAttr);
         CHECK_MSTATUS ( nAttr.setDefault(0.0f, 0.0f, 1.0f) );      // Blue

        aAlphaInput1= nAttr.createColor( "mask1", "m1" );
        MAKE_INPUT(nAttr);
         CHECK_MSTATUS ( nAttr.setDefault(.5f, .5f, .5f) );

        aAlphaInput2= nAttr.createColor( "mask2", "m2" );
        MAKE_INPUT(nAttr);
         CHECK_MSTATUS ( nAttr.setDefault(.5f, .5f, .5f) );

        // Output attributes

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

        //  Add attributes to the node database.
         CHECK_MSTATUS ( addAttribute(aColor1) );
         CHECK_MSTATUS ( addAttribute(aColor2) );
         CHECK_MSTATUS ( addAttribute(aAlphaInput1) );
         CHECK_MSTATUS ( addAttribute(aAlphaInput2) );
         CHECK_MSTATUS ( addAttribute(aOutColor) );

        // All input affect the output color
         CHECK_MSTATUS ( attributeAffects(aColor1, aOutColor) );
         CHECK_MSTATUS ( attributeAffects(aColor2, aOutColor) );
         CHECK_MSTATUS ( attributeAffects(aAlphaInput1, aOutColor) );
         CHECK_MSTATUS ( attributeAffects(aAlphaInput2, aOutColor) );

        return MS::kSuccess;
    }

    //
    // DESCRIPTION:
    MStatus MixtureNode::compute(const MPlug& plug, MDataBlock& block )
    {
        if ((plug != aOutColor) && (plug.parent() != aOutColor))
            return MS::kUnknownParameter;

        MFloatVector color1 = block.inputValue( aColor1 ).asFloatVector();
        MFloatVector color2 = block.inputValue( aColor2 ).asFloatVector();
        MFloatVector mask1  = block.inputValue( aAlphaInput1 ).asFloatVector();
        MFloatVector mask2  = block.inputValue( aAlphaInput2 ).asFloatVector();

        // Mask1 applied to color1, mask2 applied to color2
        color1[0] *= mask1[0]; color1[1] *= mask1[1]; color1[2] *= mask1[2];
        color2[0] *= mask2[0]; color2[1] *= mask2[1]; color2[2] *= mask2[2];

        // set ouput color attribute
        MDataHandle outColorHandle = block.outputValue( aOutColor );
        MFloatVector& outColor = outColorHandle.asFloatVector();
        outColor = color1 + color2;
        outColorHandle.setClean();

        return MS::kSuccess;
    }

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

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

       return MS::kSuccess;
    }

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

       return MS::kSuccess;
    }