/*****************************************************************************
 *
 * Author: Andy Zupko 
 * http://blog.zupko.info
 * 
 * Write me if you use this for anything cool!
 *
 *****************************************************************************/


kernel cos2
{

    parameter float2 center
    <
    minValue: float2(0.0, 0.0);
    maxValue:float2(2000.0, 2000.0);
    defaultValue:float2(100.0,100.0);
    >;
      parameter float spread
    <
    defaultValue:30.0;
    minValue:1.0;
    maxValue:100.0;
    >; 
    
    
    void
    evaluatePixel(image4 inImage, out pixel4 result)
    {
        float2 coord = outCoord();
        float2 pos = coord-center;
        float dist = length(pos);
        float4 color = sampleNearest(inImage, coord);
        
        float cosn = 0.25+cos((dist*dist)/(spread))*0.75;
           
        float4 a = color*float4(cosn, cosn, cosn, 1.0);
        
        result = a;
    }
    
  /*  region generated()
    {
        return region(float4(0,0,width,height));
    }*/
}