struct state_key {
	struct {
		int ModeRGB;
	} unit[8];
};
struct ureg {
	int file;
	int idx;
};
struct texenv_fragment_program {
	struct ureg src_previous;
};
struct ureg emit_texenv(struct texenv_fragment_program *p, int unit)
{
	struct state_key *key;
	emit_combine(p, key->unit[unit].ModeRGB);
}
create_new_program()
{
	struct texenv_fragment_program p;
	int unit;
	for (; unit; ++unit)
		p.src_previous = emit_texenv(&p, unit);
}