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, 68 insertions, 0 deletions

diff --git a/Ryujinx.Graphics/Shader/StructuredIr/AstBlockVisitor.cs b/Ryujinx.Graphics/Shader/StructuredIr/AstBlockVisitor.cs
new file mode 100644
index 00000000..9397fdb9
--- /dev/null
+++ b/Ryujinx.Graphics/Shader/StructuredIr/AstBlockVisitor.cs
@@ -0,0 +1,68 @@
+using System;
+using System.Collections.Generic;
+
+using static Ryujinx.Graphics.Shader.StructuredIr.AstHelper;
+
+namespace Ryujinx.Graphics.Shader.StructuredIr
+{
+    class AstBlockVisitor
+    {
+        public AstBlock Block { get; private set; }
+
+        public class BlockVisitationEventArgs : EventArgs
+        {
+            public AstBlock Block { get; }
+
+            public BlockVisitationEventArgs(AstBlock block)
+            {
+                Block = block;
+            }
+        }
+
+        public event EventHandler<BlockVisitationEventArgs> BlockEntered;
+        public event EventHandler<BlockVisitationEventArgs> BlockLeft;
+
+        public AstBlockVisitor(AstBlock mainBlock)
+        {
+            Block = mainBlock;
+        }
+
+        public IEnumerable<IAstNode> Visit()
+        {
+            IAstNode node = Block.First;
+
+            while (node != null)
+            {
+                //We reached a child block, visit the nodes inside.
+                while (node is AstBlock childBlock)
+                {
+                    Block = childBlock;
+
+                    node = childBlock.First;
+
+                    BlockEntered?.Invoke(this, new BlockVisitationEventArgs(Block));
+                }
+
+                //Node may be null, if the block is empty.
+                if (node != null)
+                {
+                    IAstNode next = Next(node);
+
+                    yield return node;
+
+                    node = next;
+                }
+
+                //We reached the end of the list, go up on tree to the parent blocks.
+                while (node == null && Block.Type != AstBlockType.Main)
+                {
+                    BlockLeft?.Invoke(this, new BlockVisitationEventArgs(Block));
+
+                    node = Next(Block);
+
+                    Block = Block.Parent;
+                }
+            }
+        }
+    }
+}
\ No newline at end of file