void set_shader_program(const Program *, const ProgramData *);
const Program *get_shader_program() const { return shprog; }
const ProgramData *get_shader_data() const { return shdata; }
void set_shader_program(const Program *, const ProgramData *);
const Program *get_shader_program() const { return shprog; }
const ProgramData *get_shader_data() const { return shdata; }
void set_material(const Material *);
const Material *get_material() const { return material.get(); }
const std::string &get_material_slot_name() const { return material_slot; }
void set_material(const Material *);
const Material *get_material() const { return material.get(); }
const std::string &get_material_slot_name() const { return material_slot; }