// https://knarkowicz.wordpress.com/2016/01/06/aces-filmic-tone-mapping-curve/
vec3 acesFilm(const vec3 x) {
    const float a = 2.51;
    const float b = 0.03;
    const float c = 2.43;
    const float d = 0.59;
    const float e = 0.14;
    return clamp((x * (a * x + b)) / (x * (c * x + d ) + e), 0.0, 1.0);
}

out vec4 color;

void main(void) {
    vec2 uv = TEXCOORD.st;
    vec4 src = texture2D(iChannel0, uv);
    color = vec4( acesFilm(src.xyz), src.a);
}