#!/usr/bin/env bash

 #Define shader
GRAYSCALE=$(cat <<-END
uniform sampler2D tex;

void main() {
   vec4 c = texture2D(tex, gl_TexCoord[0].xy);
   float y = dot(c.rgb, vec3(0.299, 0.587, 0.114));
   vec4 gray = vec4(y, y, y, c.a);
   gl_FragColor = mix(c, gray, 0.95);

}
END
)

# Restart compton with the selected mode
killall -q compton
if [[ $MODE == "grayscale" ]]; then
   compton "$@" --glx-fshader-win "$GRAYSCALE" --backend glx
else
   compton "$@"
fi