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vec4 desaturate(vec3 color, float strength)
{
vec3 lum = vec3(0.299, 0.587, 0.114); // lum values based on: ITU-R BT.601
vec3 gray = vec3(dot(lum, color));
return vec4(mix(color, gray, strength), 1.0);
}
void MAIN()
{
vec4 origColor = texture(INPUT, INPUT_UV);
FRAGCOLOR = desaturate(origColor.rgb, amount);
}