/** Sets the shader program to use. An initial set of data can be set as
well, with the same semantics as add_shader_data. */
void set_shader_program(const Program *prog, const ProgramData *data = 0);
/** Sets the shader program to use. An initial set of data can be set as
well, with the same semantics as add_shader_data. */
void set_shader_program(const Program *prog, const ProgramData *data = 0);