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# simpleImageFile.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:
    //  Simple Image File plugin. This plugin registers a new image
    //  file format against file extension ".moo". Loading any ".moo"
    //  image file will produce a procedurally generated colour
    //  spectrum including values outside 0 to 1.
    //

    #include <maya/MPxImageFile.h>
    #include <maya/MImageFileInfo.h>
    #include <maya/MImage.h>
    #include <maya/MFnPlugin.h>
    #include <maya/MStringArray.h>
    #include <maya/MIOStream.h>

    #if defined(OSMac_MachO_)
    #include <OpenGL/gl.h>
    #include <OpenGL/glu.h>
    #else
    #include <GL/gl.h>
    #include <GL/glu.h>
    #endif

    MString kImagePluginName( "SimpleImageFile");

    class SimpleImageFile : public MPxImageFile
    {
    public:
                        SimpleImageFile();
        virtual         ~SimpleImageFile();
        static void*    creator();
        virtual MStatus open( MString pathname, MImageFileInfo* info);
        virtual MStatus load( MImage& image, unsigned int idx);
        virtual MStatus glLoad( const MImageFileInfo& info, unsigned int imageNumber);

    private:
        void            populateTestImage( float* pixels, unsigned int w, unsigned int h);
    };

    //
    // DESCRIPTION:
    SimpleImageFile::SimpleImageFile()
    {
    }

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

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

    //
    // DESCRIPTION:
    // Configure the image characteristics. A real image file
    // format plugin would extract these values from the image
    // file header.
    //
    MStatus SimpleImageFile::open( MString pathname, MImageFileInfo* info)
    {
        if( info)
        {
            info->width( 512);
            info->height( 512);
            info->channels( 3);
            info->pixelType( MImage::kFloat);

            // Only necessary if your format defines a native
            // hardware texture loader
            info->hardwareType( MImageFileInfo::kHwTexture2D);
        }
        return MS::kSuccess;
    }

    //
    // DESCRIPTION:
    // Internal helper method to populate our procedural test image
    //
    void SimpleImageFile::populateTestImage( float* pixels, unsigned int w, unsigned int h)
    {
        #define RAINBOW_SCALE 4.0f
        unsigned int x, y;
        for( y = 0; y < h; y++)
        {
            float g = RAINBOW_SCALE * y / (float)h;
            for( x = 0; x < w; x++)
            {
                float r = RAINBOW_SCALE * x / (float)w;
                *pixels++ = r;
                *pixels++ = g;
                *pixels++ = RAINBOW_SCALE * 1.5f - r - g;
            }
        }
    }

    //
    // DESCRIPTION:
    // Load the contents of this image file into an MImage. A real
    // file format plugin would extract the pixel data from the image
    // file here.
    //
    MStatus SimpleImageFile::load( MImage& image, unsigned int)
    {
        unsigned int w = 512;
        unsigned int h = 512;

        // Create a floating point image and fill it with
        // a pretty rainbow test image.
        //
        image.create( w, h, 3, MImage::kFloat);
        populateTestImage( image.floatPixels(), w, h);
        return MS::kSuccess;
    }

    //
    // DESCRIPTION:
    // Load the contents of this image file into an OpenGL texture. A
    // real file format plugin would extract the pixel data from the
    // image file here.
    //
    MStatus SimpleImageFile::glLoad( const MImageFileInfo& info, unsigned int)
    {
        // Create a floating point image
        unsigned int w = info.width();
        unsigned int h = info.height();
        float* pixels = new float[ w * h * 3];
        populateTestImage( pixels, w, h);

        // Now load it into OpenGL as a floating point image
        ::glTexImage2D( GL_TEXTURE_2D, 0, GL_RGB, w, h, 0, GL_RGB, GL_FLOAT, pixels);

        delete[] pixels;
        return MS::kSuccess;
    }

    // DESCRIPTION:
    MStatus initializePlugin( MObject obj )
    {
        MFnPlugin plugin( obj, PLUGIN_COMPANY, "8.0", "Any" );
        MStringArray extensions;
        extensions.append( "moo");
        CHECK_MSTATUS( plugin.registerImageFile(
                        kImagePluginName,
                        SimpleImageFile::creator,
                        extensions));

        return MS::kSuccess;
    }

    // DESCRIPTION:
    MStatus uninitializePlugin( MObject obj )
    {
        MFnPlugin plugin( obj );
        CHECK_MSTATUS( plugin.deregisterImageFile( kImagePluginName ) );

        return MS::kSuccess;
    }