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, 206 insertions, 0 deletions

diff --git a/Ryujinx.Graphics/Shader/CodeGen/Glsl/Declarations.cs b/Ryujinx.Graphics/Shader/CodeGen/Glsl/Declarations.cs
new file mode 100644
index 00000000..5412d872
--- /dev/null
+++ b/Ryujinx.Graphics/Shader/CodeGen/Glsl/Declarations.cs
@@ -0,0 +1,206 @@
+using Ryujinx.Graphics.Gal;
+using Ryujinx.Graphics.Shader.IntermediateRepresentation;
+using Ryujinx.Graphics.Shader.StructuredIr;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace Ryujinx.Graphics.Shader.CodeGen.Glsl
+{
+    static class Declarations
+    {
+        public static void Declare(CodeGenContext context, StructuredProgramInfo info)
+        {
+            context.AppendLine("#version 420 core");
+
+            context.AppendLine();
+
+            context.AppendLine($"const int {DefaultNames.UndefinedName} = 0;");
+
+            context.AppendLine();
+
+            if (context.Config.Type == GalShaderType.Geometry)
+            {
+                context.AppendLine("layout (points) in;");
+                context.AppendLine("layout (triangle_strip, max_vertices = 4) out;");
+
+                context.AppendLine();
+            }
+
+            context.AppendLine("layout (std140) uniform Extra");
+
+            context.EnterScope();
+
+            context.AppendLine("vec2 flip;");
+            context.AppendLine("int instance;");
+
+            context.LeaveScope(";");
+
+            context.AppendLine();
+
+            if (info.CBuffers.Count != 0)
+            {
+                DeclareUniforms(context, info);
+
+                context.AppendLine();
+            }
+
+            if (info.Samplers.Count != 0)
+            {
+                DeclareSamplers(context, info);
+
+                context.AppendLine();
+            }
+
+            if (info.IAttributes.Count != 0)
+            {
+                DeclareInputAttributes(context, info);
+
+                context.AppendLine();
+            }
+
+            if (info.OAttributes.Count != 0)
+            {
+                DeclareOutputAttributes(context, info);
+
+                context.AppendLine();
+            }
+        }
+
+        public static void DeclareLocals(CodeGenContext context, StructuredProgramInfo info)
+        {
+            foreach (AstOperand decl in info.Locals)
+            {
+                string name = context.OperandManager.DeclareLocal(decl);
+
+                context.AppendLine(GetVarTypeName(decl.VarType) + " " + name + ";");
+            }
+        }
+
+        private static string GetVarTypeName(VariableType type)
+        {
+            switch (type)
+            {
+                case VariableType.Bool: return "bool";
+                case VariableType.F32:  return "float";
+                case VariableType.S32:  return "int";
+                case VariableType.U32:  return "uint";
+            }
+
+            throw new ArgumentException($"Invalid variable type \"{type}\".");
+        }
+
+        private static void DeclareUniforms(CodeGenContext context, StructuredProgramInfo info)
+        {
+            foreach (int cbufSlot in info.CBuffers.OrderBy(x => x))
+            {
+                string ubName = OperandManager.GetShaderStagePrefix(context.Config.Type);
+
+                ubName += "_" + DefaultNames.UniformNamePrefix + cbufSlot;
+
+                context.CBufferDescriptors.Add(new CBufferDescriptor(ubName, cbufSlot));
+
+                context.AppendLine("layout (std140) uniform " + ubName);
+
+                context.EnterScope();
+
+                string ubSize = "[" + NumberFormatter.FormatInt(context.Config.MaxCBufferSize / 16) + "]";
+
+                context.AppendLine("vec4 " + OperandManager.GetUbName(context.Config.Type, cbufSlot) + ubSize + ";");
+
+                context.LeaveScope(";");
+            }
+        }
+
+        private static void DeclareSamplers(CodeGenContext context, StructuredProgramInfo info)
+        {
+            Dictionary<string, AstTextureOperation> samplers = new Dictionary<string, AstTextureOperation>();
+
+            foreach (AstTextureOperation texOp in info.Samplers.OrderBy(x => x.Handle))
+            {
+                string samplerName = OperandManager.GetSamplerName(context.Config.Type, texOp);
+
+                if (!samplers.TryAdd(samplerName, texOp))
+                {
+                    continue;
+                }
+
+                string samplerTypeName = GetSamplerTypeName(texOp.Type);
+
+                context.AppendLine("uniform " + samplerTypeName + " " + samplerName + ";");
+            }
+
+            foreach (KeyValuePair<string, AstTextureOperation> kv in samplers)
+            {
+                string samplerName = kv.Key;
+
+                AstTextureOperation texOp = kv.Value;
+
+                TextureDescriptor desc;
+
+                if ((texOp.Flags & TextureFlags.Bindless) != 0)
+                {
+                    AstOperand operand = texOp.GetSource(0) as AstOperand;
+
+                    desc = new TextureDescriptor(samplerName, operand.CbufSlot, operand.CbufOffset);
+                }
+                else
+                {
+                    desc = new TextureDescriptor(samplerName, texOp.Handle);
+                }
+
+                context.TextureDescriptors.Add(desc);
+            }
+        }
+
+        private static void DeclareInputAttributes(CodeGenContext context, StructuredProgramInfo info)
+        {
+            string suffix = context.Config.Type == GalShaderType.Geometry ? "[]" : string.Empty;
+
+            foreach (int attr in info.IAttributes.OrderBy(x => x))
+            {
+                context.AppendLine($"layout (location = {attr}) in vec4 {DefaultNames.IAttributePrefix}{attr}{suffix};");
+            }
+        }
+
+        private static void DeclareOutputAttributes(CodeGenContext context, StructuredProgramInfo info)
+        {
+            foreach (int attr in info.OAttributes.OrderBy(x => x))
+            {
+                context.AppendLine($"layout (location = {attr}) out vec4 {DefaultNames.OAttributePrefix}{attr};");
+            }
+        }
+
+        private static string GetSamplerTypeName(TextureType type)
+        {
+            string typeName;
+
+            switch (type & TextureType.Mask)
+            {
+                case TextureType.Texture1D:   typeName = "sampler1D";   break;
+                case TextureType.Texture2D:   typeName = "sampler2D";   break;
+                case TextureType.Texture3D:   typeName = "sampler3D";   break;
+                case TextureType.TextureCube: typeName = "samplerCube"; break;
+
+                default: throw new ArgumentException($"Invalid sampler type \"{type}\".");
+            }
+
+            if ((type & TextureType.Multisample) != 0)
+            {
+                typeName += "MS";
+            }
+
+            if ((type & TextureType.Array) != 0)
+            {
+                typeName += "Array";
+            }
+
+            if ((type & TextureType.Shadow) != 0)
+            {
+                typeName += "Shadow";
+            }
+
+            return typeName;
+        }
+    }
+}
\ No newline at end of file