void set_shader_program(const Program *, const ProgramData *);
const Program *get_shader_program() const { return shprog; }
void set_shader_program(const Program *, const ProgramData *);
const Program *get_shader_program() const { return shprog; }
void set_texture(unsigned, const Texture *);
const Texturing *get_texturing() const { return texturing; }
int get_texture_index(const std::string &) const;
void set_texture(unsigned, const Texture *);
const Texturing *get_texturing() const { return texturing; }
int get_texture_index(const std::string &) const;