kernel Pixelate
<   nameSpace: "popforge::ImageProcessing";
    vendor: "joa ebert";
    version: 1;
    description: "pixelate filter using modulo";
>
{
    parameter float2 strength<
        minValue: float2(1.0,1.0);
        maxValue: float2(64.0,64.0);
        defaultValue: float2(2.0,2.0);
    >;
    
    void evaluatePixel(in image4 source, out pixel4 result)
    {
        float2 pos = outCoord();
        pos -= mod( pos, strength );
        //pos += strength * float2(0.5,0.5);
        
        pixel4 cur = sampleNearest( source, pos );
        result = cur;
    }
}