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, 101 insertions, 0 deletions

diff --git a/Ryujinx.Graphics/Shader/IntermediateRepresentation/Operation.cs b/Ryujinx.Graphics/Shader/IntermediateRepresentation/Operation.cs
new file mode 100644
index 00000000..f6579953
--- /dev/null
+++ b/Ryujinx.Graphics/Shader/IntermediateRepresentation/Operation.cs
@@ -0,0 +1,101 @@
+namespace Ryujinx.Graphics.Shader.IntermediateRepresentation
+{
+    class Operation : INode
+    {
+        public Instruction Inst { get; private set; }
+
+        private Operand _dest;
+
+        public Operand Dest
+        {
+            get => _dest;
+            set => _dest = AssignDest(value);
+        }
+
+        private Operand[] _sources;
+
+        public int SourcesCount => _sources.Length;
+
+        public int ComponentIndex { get; }
+
+        public Operation(Instruction inst, Operand dest, params Operand[] sources)
+        {
+            Inst = inst;
+            Dest = dest;
+
+            //The array may be modified externally, so we store a copy.
+            _sources = (Operand[])sources.Clone();
+
+            for (int index = 0; index < _sources.Length; index++)
+            {
+                Operand source = _sources[index];
+
+                if (source.Type == OperandType.LocalVariable)
+                {
+                    source.UseOps.Add(this);
+                }
+            }
+        }
+
+        public Operation(
+            Instruction      inst,
+            int              compIndex,
+            Operand          dest,
+            params Operand[] sources) : this(inst, dest, sources)
+        {
+            ComponentIndex = compIndex;
+        }
+
+        private Operand AssignDest(Operand dest)
+        {
+            if (dest != null && dest.Type == OperandType.LocalVariable)
+            {
+                dest.AsgOp = this;
+            }
+
+            return dest;
+        }
+
+        public Operand GetSource(int index)
+        {
+            return _sources[index];
+        }
+
+        public void SetSource(int index, Operand source)
+        {
+            Operand oldSrc = _sources[index];
+
+            if (oldSrc != null && oldSrc.Type == OperandType.LocalVariable)
+            {
+                oldSrc.UseOps.Remove(this);
+            }
+
+            if (source.Type == OperandType.LocalVariable)
+            {
+                source.UseOps.Add(this);
+            }
+
+            _sources[index] = source;
+        }
+
+        public void TurnIntoCopy(Operand source)
+        {
+            Inst = Instruction.Copy;
+
+            foreach (Operand oldSrc in _sources)
+            {
+                if (oldSrc.Type == OperandType.LocalVariable)
+                {
+                    oldSrc.UseOps.Remove(this);
+                }
+            }
+
+            if (source.Type == OperandType.LocalVariable)
+            {
+                source.UseOps.Add(this);
+            }
+
+            _sources = new Operand[] { source };
+        }
+    }
+}
\ No newline at end of file