kernel SinePlasma
<   nameSpace: "popforge::ImageProcessing";
    vendor: "Joa Ebert";
    version: 1;
    description: "generates a simple monochromatic sine plasma";
>
{
    parameter int width
    <
        defaultValue:   200;
        minValue:       1;
        maxValue:       400;
        description:    "height of the generated plasma";
    >;
    
    parameter int height
    <
        defaultValue:   200;
        minValue:       1;
        maxValue:       400;
        description:    "width of the generated plasma";
    >;
    
    parameter float amp
    <
        minValue:       0.0;
        maxValue:       2.0;
        defaultValue:   1.0;
        description:    "amplitude of the sine wave";
    >;
    
    parameter float freqX
    <
        minValue:       0.0;
        maxValue:       2.0;
        defaultValue:   0.5;
        description:    "sine frequency in x-direction";
    >;
    
    parameter float freqY
    <
        minValue:       0.0;
        maxValue:       2.0;
        defaultValue:   0.5;
        description:    "sine frequency in y-direction";
    >;
    
    parameter float levelRed
    <
        minValue:       0.0;
        maxValue:       2.0;
        defaultValue:   1.0;
        description:    "red channel multiplier";
    >;
    
    parameter float levelGreen
    <
        minValue:       0.0;
        maxValue:       2.0;
        defaultValue:   1.0;
        description:    "green channel multiplier";
    >;
    
    parameter float levelBlue
    <
        minValue:       0.0;
        maxValue:       2.0;
        defaultValue:   1.0;
        description:    "blue channel multiplier";
    >;
    
    void evaluatePixel(out pixel4 result)
    {
        float2 coords = outCoord();
        float y = 0.25 * sin( freqX * coords.x ) + 0.25 * sin( freqY * coords.y ) * amp + 0.5;
        result = pixel4(levelRed*y,levelGreen*y,levelBlue*y,y);
    }
    
    region generated()
    {
        return region(float4(0,0,width,height));
    }
}