CSPspEmu.Core.Cpu.VFpu.VfpuPrefix.SourceIndex C# (CSharp) Method

        public uint SourceIndex(int i)
        {
            return BitUtils.Extract(Value, 0 + i * 2, 2);
        }

        public static void ParseAndUpdateVfprSourceTargetPrefix(int Index, string RegisterName, ref VfpuPrefix VfpuPrefix)
        {
            int SetIndex = Index;
            bool IsConstant;

            RegisterName = RegisterName.Replace(" ", "");

            if (RegisterName.StartsWith("-"))
            {
                RegisterName = RegisterName.Substr(1);
                VfpuPrefix.SourceNegate(Index, true);
            }

            if (RegisterName.StartsWith("|") && RegisterName.EndsWith("|"))
            {
                RegisterName = RegisterName.Substr(1, -1);
                VfpuPrefix.SourceAbsolute(Index, true);
            }

            switch (RegisterName)
            {
                case "x": IsConstant = false; SetIndex = 0; break;
                case "y": IsConstant = false; SetIndex = 1; break;
                case "z": IsConstant = false; SetIndex = 2; break;
                case "w": IsConstant = false; SetIndex = 3; break;
                case "3": IsConstant = true; SetIndex = 0; VfpuPrefix.SourceAbsolute(Index, true); break;
                case "0": IsConstant = true; SetIndex = 0; VfpuPrefix.SourceAbsolute(Index, false); break;
                case "1/3": IsConstant = true; SetIndex = 1; VfpuPrefix.SourceAbsolute(Index, true); break;
                case "1": IsConstant = true; SetIndex = 1; VfpuPrefix.SourceAbsolute(Index, false); break;
                case "1/4": IsConstant = true; SetIndex = 2; VfpuPrefix.SourceAbsolute(Index, true); break;
                case "2": IsConstant = true; SetIndex = 2; VfpuPrefix.SourceAbsolute(Index, false); break;
                case "1/6": IsConstant = true; SetIndex = 3; VfpuPrefix.SourceAbsolute(Index, true); break;
                case "1/2": IsConstant = true; SetIndex = 3; VfpuPrefix.SourceAbsolute(Index, false); break;
                default: throw(new NotImplementedException(String.Format("Invalid RegisterName {0}", RegisterName)));
            }

            VfpuPrefix.SourceConstant(Index, IsConstant);
            VfpuPrefix.SourceIndex(Index, (uint)SetIndex);
        }