lighttroupe/luz

class ActorEffectPixelGlowMap < ActorEffect
    virtual        # deprecated, not useful

    title                "Pixel Glow Map"
    description "Uses chosen image to add to (or subtact from) actor's pixel values."

    categories :color

    setting 'glow_map', :image, :shader => true
    setting 'amount', :float, :range => -10.0..10.0, :default => 0.0..2.0, :shader => true
    setting 'offset_x', :float, :range => -1.0..1.0, :default => 0.0..1.0, :shader => true
    setting 'offset_y', :float, :range => -1.0..1.0, :default => 0.0..1.0, :shader => true

    CODE = "
        vec4 glow_rgba = texture2D(glow_map, texture_st + vec2(-offset_x, offset_y));

        output_rgba.r += (glow_rgba.r * glow_rgba.a * amount);
        output_rgba.g += (glow_rgba.g * glow_rgba.a * amount);
        output_rgba.b += (glow_rgba.b * glow_rgba.a * amount);
    "

    def render
        return yield if amount == 0.0

        with_fragment_shader_snippet(CODE, self) {
            yield
        }
    end
end