From 1876b346fea647e8284a66bb6d62c38801035cff Mon Sep 17 00:00:00 2001
From: gdk <gab.dark.100@gmail.com>
Date: Sun, 13 Oct 2019 03:02:07 -0300
Subject: Initial work

---
 .../Translation/Optimizations/GlobalToStorage.cs   | 145 +++++++++++++++++++++
 1 file changed, 145 insertions(+)
 create mode 100644 Ryujinx.Graphics.Shader/Translation/Optimizations/GlobalToStorage.cs

(limited to 'Ryujinx.Graphics.Shader/Translation/Optimizations/GlobalToStorage.cs')

diff --git a/Ryujinx.Graphics.Shader/Translation/Optimizations/GlobalToStorage.cs b/Ryujinx.Graphics.Shader/Translation/Optimizations/GlobalToStorage.cs
new file mode 100644
index 00000000..06db2a80
--- /dev/null
+++ b/Ryujinx.Graphics.Shader/Translation/Optimizations/GlobalToStorage.cs
@@ -0,0 +1,145 @@
+using Ryujinx.Graphics.Shader.IntermediateRepresentation;
+using System.Collections.Generic;
+
+using static Ryujinx.Graphics.Shader.IntermediateRepresentation.OperandHelper;
+
+namespace Ryujinx.Graphics.Shader.Translation.Optimizations
+{
+    static class GlobalToStorage
+    {
+        private const int StorageDescsBaseOffset = 0x44; // In words.
+
+        private const int UbeStorageDescsBaseOffset = 0x84; // In words.
+        private const int UbeStorageMaxCount        = 14;
+
+        private const int StorageDescSize = 4; // In words.
+        private const int StorageMaxCount = 16;
+
+        private const int StorageDescsSize  = StorageDescSize * StorageMaxCount;
+
+        public static void RunPass(BasicBlock block, ShaderStage stage)
+        {
+            int sbStart = GetStorageBaseCbOffset(stage);
+
+            int sbEnd = sbStart + StorageDescsSize;
+
+            // This one is only used on compute shaders.
+            // Compute shaders uses two separate sets of storage.
+            int ubeSbStart = UbeStorageDescsBaseOffset;
+            int ubeSbEnd   = UbeStorageDescsBaseOffset + StorageDescSize * UbeStorageMaxCount;
+
+            for (LinkedListNode<INode> node = block.Operations.First; node != null; node = node.Next)
+            {
+                if (!(node.Value is Operation operation))
+                {
+                    continue;
+                }
+
+                if (operation.Inst == Instruction.LoadGlobal ||
+                    operation.Inst == Instruction.StoreGlobal)
+                {
+                    Operand source = operation.GetSource(0);
+
+                    if (source.AsgOp is Operation asgOperation)
+                    {
+                        int storageIndex = SearchForStorageBase(asgOperation, sbStart, sbEnd);
+
+                        /*if (storageIndex < 0 && stage == ShaderStage.Compute)
+                        {
+                            storageIndex = SearchForStorageBase(asgOperation, ubeSbStart, ubeSbEnd);
+                        }*/
+
+                        if (storageIndex >= 0)
+                        {
+                            node = ReplaceGlobalWithStorage(node, storageIndex);
+                        }
+                    }
+                }
+            }
+        }
+
+        private static LinkedListNode<INode> ReplaceGlobalWithStorage(LinkedListNode<INode> node, int storageIndex)
+        {
+            Operation operation = (Operation)node.Value;
+
+            Operation storageOp;
+
+            if (operation.Inst == Instruction.LoadGlobal)
+            {
+                Operand source = operation.GetSource(0);
+
+                storageOp = new Operation(Instruction.LoadStorage, operation.Dest, Const(storageIndex), source);
+            }
+            else
+            {
+                Operand src1 = operation.GetSource(0);
+                Operand src2 = operation.GetSource(1);
+
+                storageOp = new Operation(Instruction.StoreStorage, null, Const(storageIndex), src1, src2);
+            }
+
+            for (int index = 0; index < operation.SourcesCount; index++)
+            {
+                operation.SetSource(index, null);
+            }
+
+            LinkedListNode<INode> oldNode = node;
+
+            node = node.List.AddAfter(node, storageOp);
+
+            node.List.Remove(oldNode);
+
+            return node;
+        }
+
+        private static int SearchForStorageBase(Operation operation, int sbStart, int sbEnd)
+        {
+            Queue<Operation> assignments = new Queue<Operation>();
+
+            assignments.Enqueue(operation);
+
+            while (assignments.TryDequeue(out operation))
+            {
+                for (int index = 0; index < operation.SourcesCount; index++)
+                {
+                    Operand source = operation.GetSource(index);
+
+                    if (source.Type == OperandType.ConstantBuffer)
+                    {
+                        int slot   = source.GetCbufSlot();
+                        int offset = source.GetCbufOffset();
+
+                        if (slot == 0 && offset >= sbStart && offset < sbEnd)
+                        {
+                            int storageIndex = (offset - sbStart) / StorageDescSize;
+
+                            return storageIndex;
+                        }
+                    }
+
+                    if (source.AsgOp is Operation asgOperation)
+                    {
+                        assignments.Enqueue(asgOperation);
+                    }
+                }
+            }
+
+            return -1;
+        }
+
+        private static int GetStorageBaseCbOffset(ShaderStage stage)
+        {
+            switch (stage)
+            {
+                case ShaderStage.Compute:                return StorageDescsBaseOffset + 2 * StorageDescsSize;
+                case ShaderStage.Vertex:                 return StorageDescsBaseOffset;
+                case ShaderStage.TessellationControl:    return StorageDescsBaseOffset + 1 * StorageDescsSize;
+                case ShaderStage.TessellationEvaluation: return StorageDescsBaseOffset + 2 * StorageDescsSize;
+                case ShaderStage.Geometry:               return StorageDescsBaseOffset + 3 * StorageDescsSize;
+                case ShaderStage.Fragment:               return StorageDescsBaseOffset + 4 * StorageDescsSize;
+            }
+
+            return 0;
+        }
+    }
+}
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