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, 110 insertions, 0 deletions

diff --git a/Ryujinx.Graphics/Shader/CodeGen/Glsl/Instructions/InstGen.cs b/Ryujinx.Graphics/Shader/CodeGen/Glsl/Instructions/InstGen.cs
new file mode 100644
index 00000000..b0b2ec1a
--- /dev/null
+++ b/Ryujinx.Graphics/Shader/CodeGen/Glsl/Instructions/InstGen.cs
@@ -0,0 +1,110 @@
+using Ryujinx.Graphics.Shader.IntermediateRepresentation;
+using Ryujinx.Graphics.Shader.StructuredIr;
+using System;
+
+using static Ryujinx.Graphics.Shader.CodeGen.Glsl.Instructions.InstGenHelper;
+using static Ryujinx.Graphics.Shader.StructuredIr.InstructionInfo;
+
+namespace Ryujinx.Graphics.Shader.CodeGen.Glsl.Instructions
+{
+    static class InstGen
+    {
+        public static string GetExpression(CodeGenContext context, IAstNode node)
+        {
+            if (node is AstOperation operation)
+            {
+                return GetExpression(context, operation);
+            }
+            else if (node is AstOperand operand)
+            {
+                return context.OperandManager.GetExpression(operand, context.Config.Type);
+            }
+
+            throw new ArgumentException($"Invalid node type \"{node?.GetType().Name ?? "null"}\".");
+        }
+
+        private static string GetExpression(CodeGenContext context, AstOperation operation)
+        {
+            Instruction inst = operation.Inst;
+
+            InstInfo info = GetInstructionInfo(inst);
+
+            if ((info.Type & InstType.Call) != 0)
+            {
+                int arity = (int)(info.Type & InstType.ArityMask);
+
+                string args = string.Empty;
+
+                for (int argIndex = 0; argIndex < arity; argIndex++)
+                {
+                    if (argIndex != 0)
+                    {
+                        args += ", ";
+                    }
+
+                    VariableType dstType = GetSrcVarType(inst, argIndex);
+
+                    args += GetSoureExpr(context, operation.GetSource(argIndex), dstType);
+                }
+
+                return info.OpName + "(" + args + ")";
+            }
+            else if ((info.Type & InstType.Op) != 0)
+            {
+                string op = info.OpName;
+
+                int arity = (int)(info.Type & InstType.ArityMask);
+
+                string[] expr = new string[arity];
+
+                for (int index = 0; index < arity; index++)
+                {
+                    IAstNode src = operation.GetSource(index);
+
+                    string srcExpr = GetSoureExpr(context, src, GetSrcVarType(inst, index));
+
+                    bool isLhs = arity == 2 && index == 0;
+
+                    expr[index] = Enclose(srcExpr, src, inst, info, isLhs);
+                }
+
+                switch (arity)
+                {
+                    case 0:
+                        return op;
+
+                    case 1:
+                        return op + expr[0];
+
+                    case 2:
+                        return $"{expr[0]} {op} {expr[1]}";
+
+                    case 3:
+                        return $"{expr[0]} {op[0]} {expr[1]} {op[1]} {expr[2]}";
+                }
+            }
+            else if ((info.Type & InstType.Special) != 0)
+            {
+                switch (inst)
+                {
+                    case Instruction.LoadConstant:
+                        return InstGenMemory.LoadConstant(context, operation);
+
+                    case Instruction.PackHalf2x16:
+                        return InstGenPacking.PackHalf2x16(context, operation);
+
+                    case Instruction.TextureSample:
+                        return InstGenMemory.TextureSample(context, operation);
+
+                    case Instruction.TextureSize:
+                        return InstGenMemory.TextureSize(context, operation);
+
+                    case Instruction.UnpackHalf2x16:
+                        return InstGenPacking.UnpackHalf2x16(context, operation);
+                }
+            }
+
+            throw new InvalidOperationException($"Unexpected instruction type \"{info.Type}\".");
+        }
+    }
+}
\ No newline at end of file