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, 116 insertions, 0 deletions

diff --git a/Ryujinx.Graphics/Shader/StructuredIr/AstBlock.cs b/Ryujinx.Graphics/Shader/StructuredIr/AstBlock.cs
new file mode 100644
index 00000000..fdef87de
--- /dev/null
+++ b/Ryujinx.Graphics/Shader/StructuredIr/AstBlock.cs
@@ -0,0 +1,116 @@
+using Ryujinx.Graphics.Shader.IntermediateRepresentation;
+using System;
+using System.Collections;
+using System.Collections.Generic;
+
+using static Ryujinx.Graphics.Shader.StructuredIr.AstHelper;
+
+namespace Ryujinx.Graphics.Shader.StructuredIr
+{
+    class AstBlock : AstNode, IEnumerable<IAstNode>
+    {
+        public AstBlockType Type { get; private set; }
+
+        private IAstNode _condition;
+
+        public IAstNode Condition
+        {
+            get
+            {
+                return _condition;
+            }
+            set
+            {
+                RemoveUse(_condition, this);
+
+                AddUse(value, this);
+
+                _condition = value;
+            }
+        }
+
+        private LinkedList<IAstNode> _nodes;
+
+        public IAstNode First => _nodes.First?.Value;
+
+        public int Count => _nodes.Count;
+
+        public AstBlock(AstBlockType type, IAstNode condition = null)
+        {
+            Type      = type;
+            Condition = condition;
+
+            _nodes = new LinkedList<IAstNode>();
+        }
+
+        public void Add(IAstNode node)
+        {
+            Add(node, _nodes.AddLast(node));
+        }
+
+        public void AddFirst(IAstNode node)
+        {
+            Add(node, _nodes.AddFirst(node));
+        }
+
+        public void AddBefore(IAstNode next, IAstNode node)
+        {
+            Add(node, _nodes.AddBefore(next.LLNode, node));
+        }
+
+        public void AddAfter(IAstNode prev, IAstNode node)
+        {
+            Add(node, _nodes.AddAfter(prev.LLNode, node));
+        }
+
+        private void Add(IAstNode node, LinkedListNode<IAstNode> newNode)
+        {
+            if (node.Parent != null)
+            {
+                throw new ArgumentException("Node already belongs to a block.");
+            }
+
+            node.Parent = this;
+            node.LLNode = newNode;
+        }
+
+        public void Remove(IAstNode node)
+        {
+            _nodes.Remove(node.LLNode);
+
+            node.Parent = null;
+            node.LLNode = null;
+        }
+
+        public void AndCondition(IAstNode cond)
+        {
+            Condition = new AstOperation(Instruction.LogicalAnd, Condition, cond);
+        }
+
+        public void OrCondition(IAstNode cond)
+        {
+            Condition = new AstOperation(Instruction.LogicalOr, Condition, cond);
+        }
+        public void TurnIntoIf(IAstNode cond)
+        {
+            Condition = cond;
+
+            Type = AstBlockType.If;
+        }
+
+        public void TurnIntoElseIf()
+        {
+            Type = AstBlockType.ElseIf;
+        }
+
+        public IEnumerator<IAstNode> GetEnumerator()
+        {
+            return _nodes.GetEnumerator();
+        }
+
+        IEnumerator IEnumerable.GetEnumerator()
+        {
+            return GetEnumerator();
+        }
+    }
+}
\ No newline at end of file