New shader translator implementation (#654)

* Start implementing a new shader translator

* Fix shift instructions and a typo

* Small refactoring on StructuredProgram, move RemovePhis method to a separate class

* Initial geometry shader support

* Implement TLD4

* Fix -- There's no negation on FMUL32I

* Add constant folding and algebraic simplification optimizations, nits

* Some leftovers from constant folding

* Avoid cast for constant assignments

* Add a branch elimination pass, and misc small fixes

* Remove redundant branches, add expression propagation and other improvements on the code

* Small leftovers -- add missing break and continue, remove unused properties, other improvements

* Add null check to handle empty block cases on block visitor

* Add HADD2 and HMUL2 half float shader instructions

* Optimize pack/unpack sequences, some fixes related to half float instructions

* Add TXQ, TLD, TLDS and TLD4S shader texture instructions, and some support for bindless textures, some refactoring on codegen

* Fix copy paste mistake that caused RZ to be ignored on the AST instruction

* Add workaround for conditional exit, and fix half float instruction with constant buffer

* Add missing 0.0 source for TLDS.LZ variants

* Simplify the switch for TLDS.LZ

* Texture instructions related fixes

* Implement the HFMA instruction, and some misc. fixes

* Enable constant folding on UnpackHalf2x16 instructions

* Refactor HFMA to use OpCode* for opcode decoding rather than on the helper methods

* Remove the old shader translator

* Remove ShaderDeclInfo and other unused things

* Add dual vertex shader support

* Add ShaderConfig, used to pass shader type and maximum cbuffer size

* Move and rename some instruction enums

* Move texture instructions into a separate file

* Move operand GetExpression and locals management to OperandManager

* Optimize opcode decoding using a simple list and binary search

* Add missing condition for do-while on goto elimination

* Misc. fixes on texture instructions

* Simplify TLDS switch

* Address PR feedback, and a nit

1 files changed, 267 insertions, 0 deletions

diff --git a/Ryujinx.Graphics/Shader/Instructions/InstEmitHelper.cs b/Ryujinx.Graphics/Shader/Instructions/InstEmitHelper.cs
new file mode 100644
index 00000000..e31528d0
--- /dev/null
+++ b/Ryujinx.Graphics/Shader/Instructions/InstEmitHelper.cs
@@ -0,0 +1,267 @@
+using Ryujinx.Graphics.Shader.Decoders;
+using Ryujinx.Graphics.Shader.IntermediateRepresentation;
+using Ryujinx.Graphics.Shader.Translation;
+using System;
+
+using static Ryujinx.Graphics.Shader.IntermediateRepresentation.OperandHelper;
+
+namespace Ryujinx.Graphics.Shader.Instructions
+{
+    static class InstEmitHelper
+    {
+        public static Operand GetZF(EmitterContext context)
+        {
+            return Register(0, RegisterType.Flag);
+        }
+
+        public static Operand GetNF(EmitterContext context)
+        {
+            return Register(1, RegisterType.Flag);
+        }
+
+        public static Operand GetCF(EmitterContext context)
+        {
+            return Register(2, RegisterType.Flag);
+        }
+
+        public static Operand GetVF(EmitterContext context)
+        {
+            return Register(3, RegisterType.Flag);
+        }
+
+        public static Operand GetDest(EmitterContext context)
+        {
+            return Register(((IOpCodeRd)context.CurrOp).Rd);
+        }
+
+        public static Operand GetSrcA(EmitterContext context)
+        {
+            return Register(((IOpCodeRa)context.CurrOp).Ra);
+        }
+
+        public static Operand GetSrcB(EmitterContext context, FPType floatType)
+        {
+            if (floatType == FPType.FP32)
+            {
+                return GetSrcB(context);
+            }
+            else if (floatType == FPType.FP16)
+            {
+                int h = context.CurrOp.RawOpCode.Extract(41, 1);
+
+                return GetHalfSources(context, GetSrcB(context), FPHalfSwizzle.FP16)[h];
+            }
+            else if (floatType == FPType.FP64)
+            {
+                //TODO.
+            }
+
+            throw new ArgumentException($"Invalid floating point type \"{floatType}\".");
+        }
+
+        public static Operand GetSrcB(EmitterContext context)
+        {
+            switch (context.CurrOp)
+            {
+                case IOpCodeCbuf op:
+                    return Cbuf(op.Slot, op.Offset);
+
+                case IOpCodeImm op:
+                    return Const(op.Immediate);
+
+                case IOpCodeImmF op:
+                    return ConstF(op.Immediate);
+
+                case IOpCodeReg op:
+                    return Register(op.Rb);
+
+                case IOpCodeRegCbuf op:
+                    return Register(op.Rc);
+            }
+
+            throw new InvalidOperationException($"Unexpected opcode type \"{context.CurrOp.GetType().Name}\".");
+        }
+
+        public static Operand GetSrcC(EmitterContext context)
+        {
+            switch (context.CurrOp)
+            {
+                case IOpCodeRegCbuf op:
+                    return Cbuf(op.Slot, op.Offset);
+
+                case IOpCodeRc op:
+                    return Register(op.Rc);
+            }
+
+            throw new InvalidOperationException($"Unexpected opcode type \"{context.CurrOp.GetType().Name}\".");
+        }
+
+        public static Operand[] GetHalfSrcA(EmitterContext context)
+        {
+            OpCode op = context.CurrOp;
+
+            bool absoluteA = false, negateA = false;
+
+            if (op is IOpCodeCbuf || op is IOpCodeImm)
+            {
+                negateA   = op.RawOpCode.Extract(43);
+                absoluteA = op.RawOpCode.Extract(44);
+            }
+            else if (op is IOpCodeReg)
+            {
+                absoluteA = op.RawOpCode.Extract(44);
+            }
+            else if (op is OpCodeAluImm32 && op.Emitter == InstEmit.Hadd2)
+            {
+                negateA = op.RawOpCode.Extract(56);
+            }
+
+            FPHalfSwizzle swizzle = (FPHalfSwizzle)op.RawOpCode.Extract(47, 2);
+
+            Operand[] operands = GetHalfSources(context, GetSrcA(context), swizzle);
+
+            return FPAbsNeg(context, operands, absoluteA, negateA);
+        }
+
+        public static Operand[] GetHalfSrcB(EmitterContext context)
+        {
+            OpCode op = context.CurrOp;
+
+            FPHalfSwizzle swizzle = FPHalfSwizzle.FP16;
+
+            bool absoluteB = false, negateB = false;
+
+            if (op is IOpCodeReg)
+            {
+                swizzle = (FPHalfSwizzle)op.RawOpCode.Extract(28, 2);
+
+                absoluteB = op.RawOpCode.Extract(30);
+                negateB   = op.RawOpCode.Extract(31);
+            }
+            else if (op is IOpCodeCbuf)
+            {
+                swizzle = FPHalfSwizzle.FP32;
+
+                absoluteB = op.RawOpCode.Extract(54);
+            }
+
+            Operand[] operands = GetHalfSources(context, GetSrcB(context), swizzle);
+
+            return FPAbsNeg(context, operands, absoluteB, negateB);
+        }
+
+        public static Operand[] FPAbsNeg(EmitterContext context, Operand[] operands, bool abs, bool neg)
+        {
+            for (int index = 0; index < operands.Length; index++)
+            {
+                operands[index] = context.FPAbsNeg(operands[index], abs, neg);
+            }
+
+            return operands;
+        }
+
+        public static Operand[] GetHalfSources(EmitterContext context, Operand src, FPHalfSwizzle swizzle)
+        {
+            switch (swizzle)
+            {
+                case FPHalfSwizzle.FP16:
+                    return new Operand[]
+                    {
+                        context.UnpackHalf2x16Low (src),
+                        context.UnpackHalf2x16High(src)
+                    };
+
+                case FPHalfSwizzle.FP32: return new Operand[] { src, src };
+
+                case FPHalfSwizzle.DupH0:
+                    return new Operand[]
+                    {
+                        context.UnpackHalf2x16Low(src),
+                        context.UnpackHalf2x16Low(src)
+                    };
+
+                case FPHalfSwizzle.DupH1:
+                    return new Operand[]
+                    {
+                        context.UnpackHalf2x16High(src),
+                        context.UnpackHalf2x16High(src)
+                    };
+            }
+
+            throw new ArgumentException($"Invalid swizzle \"{swizzle}\".");
+        }
+
+        public static Operand GetHalfPacked(EmitterContext context, Operand[] results)
+        {
+            OpCode op = context.CurrOp;
+
+            FPHalfSwizzle swizzle = FPHalfSwizzle.FP16;
+
+            if (!(op is OpCodeAluImm32))
+            {
+                swizzle = (FPHalfSwizzle)context.CurrOp.RawOpCode.Extract(49, 2);
+            }
+
+            switch (swizzle)
+            {
+                case FPHalfSwizzle.FP16: return context.PackHalf2x16(results[0], results[1]);
+
+                case FPHalfSwizzle.FP32: return results[0];
+
+                case FPHalfSwizzle.DupH0:
+                {
+                    Operand h1 = GetHalfDest(context, isHigh: true);
+
+                    return context.PackHalf2x16(results[0], h1);
+                }
+
+                case FPHalfSwizzle.DupH1:
+                {
+                    Operand h0 = GetHalfDest(context, isHigh: false);
+
+                    return context.PackHalf2x16(h0, results[1]);
+                }
+            }
+
+            throw new ArgumentException($"Invalid swizzle \"{swizzle}\".");
+        }
+
+        public static Operand GetHalfDest(EmitterContext context, bool isHigh)
+        {
+            if (isHigh)
+            {
+                return context.UnpackHalf2x16High(GetDest(context));
+            }
+            else
+            {
+                return context.UnpackHalf2x16Low(GetDest(context));
+            }
+        }
+
+        public static Operand GetPredicate39(EmitterContext context)
+        {
+            IOpCodeAlu op = (IOpCodeAlu)context.CurrOp;
+
+            Operand local = Register(op.Predicate39);
+
+            if (op.InvertP)
+            {
+                local = context.BitwiseNot(local);
+            }
+
+            return local;
+        }
+
+        public static Operand SignExtendTo32(EmitterContext context, Operand src, int srcBits)
+        {
+            return context.BitfieldExtractS32(src, Const(0), Const(srcBits));
+        }
+
+        public static Operand ZeroExtendTo32(EmitterContext context, Operand src, int srcBits)
+        {
+            int mask = (int)(0xffffffffu >> (32 - srcBits));
+
+            return context.BitwiseAnd(src, Const(mask));
+        }
+    }
+}
\ No newline at end of file