public void PrepareForReturn()
        {
            if (_config.Stage == ShaderStage.Fragment)
            {
                if (_config.OmapDepth)
                {
                    Operand dest = Attribute(AttributeConsts.FragmentOutputDepth);

                    Operand src = Register(_config.GetDepthRegister(), RegisterType.Gpr);

                    this.Copy(dest, src);
                }

                int regIndex = 0;

                for (int attachment = 0; attachment < 8; attachment++)
                {
                    OutputMapTarget target = _config.OmapTargets[attachment];

                    for (int component = 0; component < 4; component++)
                    {
                        if (target.ComponentEnabled(component))
                        {
                            Operand dest = Attribute(AttributeConsts.FragmentOutputColorBase + attachment * 16 + component * 4);

                            Operand src = Register(regIndex, RegisterType.Gpr);

                            this.Copy(dest, src);

                            regIndex++;
                        }
                    }
                }
            }
        }