#define EXPANSION_CURVE_SIZE 256
class GammaExpansionEffect : public Effect {
-public:
+private:
+ // Should not be instantiated by end users.
GammaExpansionEffect();
+ friend class EffectChain;
+
+public:
virtual std::string effect_type_id() const { return "GammaExpansionEffect"; }
std::string output_fragment_shader();