lighttroupe/luz

class ActorEffectPixelBlur < ActorEffect
    title                "Pixel Blur"
    description "Averages several nearby pixels."

    categories :color

    setting 'amount', :float, :range => 0.0..1.0, :default => 0.0..1.0, :shader => true
    setting 'samples', :integer, :range => 1..8, :default => 1..4, :shader => true
    setting 'sample_distance', :float, :range => 0.0..1.0, :default => 0.004..1.0, :shader => true

    CODE = "
        vec4 accumulator = vec4(0.0,0.0,0.0,0.0);

        output_rgba *= texture2D(texture0, texture_st);

        for(int i=-samples ; i<=samples ; i++) {
            if(i != 0) {
                accumulator += texture2D(texture0, texture_st + vec2(float(i) * (sample_distance / 100.0), 0));
            }
        }

        for(int i=-samples ; i<=samples ; i++) {
            if(i != 0) {
                accumulator += texture2D(texture0, texture_st + vec2(0, float(i) * (sample_distance / 100.0)));
            }
        }

        accumulator /= float(samples * 4);

        output_rgba = mix(output_rgba, accumulator, amount);
    "

    def render
        return yield if amount == 0.0

        with_fragment_shader_snippet(CODE, self) {
            yield
        }
    end
end