WhiteBalanceEffect();
virtual std::string effect_type_id() const { return "WhiteBalanceEffect"; }
virtual AlphaHandling alpha_handling() const { return DONT_CARE_ALPHA_TYPE; }
+ virtual bool one_to_one_sampling() const { return true; }
std::string output_fragment_shader();
void set_gl_state(GLuint glsl_program_num, const std::string &prefix, unsigned *sampler_num);