ENBSeries

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        // lens distortion value
        float k = -1;

        // cubic distortion value
        float kcube = 0.5;

        float r2 = (coord.x-0.5) * (coord.x-0.5) + (coord.y-0.5) * (coord.y-0.5);       
        float f = 0;

        if( kcube == 0.0){
                f = 1 + r2 * k;
        }else{
                f = 1 + r2 * (k + kcube * sqrt(r2));
        };

        float x = f*(coord.x-0.5)+0.5;
        float y = f*(coord.y-0.5)+0.5;
        float3 inputDistord = tex2D(SamplerColor,float2(x,y));

        return float4(inputDistord.r,inputDistord.g,inputDistord.b,1);