- virtual void inform_input_size(unsigned input_num, unsigned width, unsigned height);
- void set_gl_state(GLuint glsl_program_num, const std::string &prefix, unsigned *sampler_num);
+ void inform_input_size(unsigned input_num, unsigned width, unsigned height) override;
+ void set_gl_state(GLuint glsl_program_num, const std::string &prefix, unsigned *sampler_num) override;