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, 47 insertions, 0 deletions

diff --git a/Ryujinx.Graphics/Shader/Translation/Optimizations/HalfConversion.cs b/Ryujinx.Graphics/Shader/Translation/Optimizations/HalfConversion.cs
new file mode 100644
index 00000000..9ef35abc
--- /dev/null
+++ b/Ryujinx.Graphics/Shader/Translation/Optimizations/HalfConversion.cs
@@ -0,0 +1,47 @@
+using System;
+
+namespace Ryujinx.Graphics.Shader.Translation.Optimizations
+{
+    static class HalfConversion
+    {
+        public static float HalfToSingle(int value)
+        {
+            int mantissa = (value >> 0)  & 0x3ff;
+            int exponent = (value >> 10) & 0x1f;
+            int sign     = (value >> 15) & 0x1;
+
+            if (exponent == 0x1f)
+            {
+                //NaN or Infinity.
+                mantissa <<= 13;
+                exponent   = 0xff;
+            }
+            else if (exponent != 0 || mantissa != 0 )
+            {
+                if (exponent == 0)
+                {
+                    //Denormal.
+                    int e = -1;
+                    int m = mantissa;
+
+                    do
+                    {
+                        e++;
+                        m <<= 1;
+                    }
+                    while ((m & 0x400) == 0);
+
+                    mantissa = m & 0x3ff;
+                    exponent = e;
+                }
+
+                mantissa <<= 13;
+                exponent   = 127 - 15 + exponent;
+            }
+
+            int output = (sign << 31) | (exponent << 23) | mantissa;
+
+            return BitConverter.Int32BitsToSingle(output);
+        }
+    }
+}
\ No newline at end of file