class AlphaMultiplicationEffect : public Effect {
public:
AlphaMultiplicationEffect() {}
virtual std::string effect_type_id() const { return "AlphaMultiplicationEffect"; }
std::string output_fragment_shader();
class AlphaMultiplicationEffect : public Effect {
public:
AlphaMultiplicationEffect() {}
virtual std::string effect_type_id() const { return "AlphaMultiplicationEffect"; }
std::string output_fragment_shader();