From 0d15f0fc9055b327e0208d5ec1d7230d822de99f Mon Sep 17 00:00:00 2001
From: Samuliak <samuliak77@gmail.com>
Date: Thu, 23 May 2024 15:48:20 +0200
Subject: [PATCH] implement depth stencil cache

---
 .../DepthStencilCache.cs                      | 73 +++++++++++++++++++
 .../EncoderStateManager.cs                    |  6 +-
 2 files changed, 77 insertions(+), 2 deletions(-)
 create mode 100644 src/Ryujinx.Graphics.Metal/DepthStencilCache.cs

diff --git a/src/Ryujinx.Graphics.Metal/DepthStencilCache.cs b/src/Ryujinx.Graphics.Metal/DepthStencilCache.cs
new file mode 100644
index 0000000000..8456a92283
--- /dev/null
+++ b/src/Ryujinx.Graphics.Metal/DepthStencilCache.cs
@@ -0,0 +1,73 @@
+using Ryujinx.Common.Logging;
+using Ryujinx.Graphics.GAL;
+using SharpMetal.Foundation;
+using SharpMetal.Metal;
+using System;
+using System.Collections.Generic;
+using System.Runtime.Versioning;
+
+namespace Ryujinx.Graphics.Metal
+{
+    [SupportedOSPlatform("macos")]
+    public struct DepthStencilHash
+    {
+        public struct StencilHash
+        {
+            public MTLStencilOperation StencilFailureOperation;
+            public MTLStencilOperation DepthFailureOperation;
+            public MTLStencilOperation DepthStencilPassOperation;
+            public MTLCompareFunction StencilCompareFunction;
+            public uint ReadMask;
+            public uint WriteMask;
+        }
+        public StencilHash FrontFace;
+        public StencilHash BackFace;
+        public MTLCompareFunction DepthCompareFunction;
+        public bool DepthWriteEnabled;
+    }
+
+    [SupportedOSPlatform("macos")]
+    public class DepthStencilCache : StateCache<MTLDepthStencilState, MTLDepthStencilDescriptor, DepthStencilHash>
+    {
+        private readonly MTLDevice _device;
+
+        public DepthStencilCache(MTLDevice device) {
+            _device = device;
+        }
+
+        protected override DepthStencilHash GetHash(MTLDepthStencilDescriptor descriptor) {
+            var hash = new DepthStencilHash();
+
+            // Front face
+            hash.FrontFace = new DepthStencilHash.StencilHash {
+                StencilFailureOperation = descriptor.FrontFaceStencil.StencilFailureOperation,
+                DepthFailureOperation = descriptor.FrontFaceStencil.DepthFailureOperation,
+                DepthStencilPassOperation = descriptor.FrontFaceStencil.DepthStencilPassOperation,
+                StencilCompareFunction = descriptor.FrontFaceStencil.StencilCompareFunction,
+                ReadMask = descriptor.FrontFaceStencil.ReadMask,
+                WriteMask = descriptor.FrontFaceStencil.WriteMask
+            };
+
+            // Back face
+            hash.BackFace = new DepthStencilHash.StencilHash {
+                StencilFailureOperation = descriptor.BackFaceStencil.StencilFailureOperation,
+                DepthFailureOperation = descriptor.BackFaceStencil.DepthFailureOperation,
+                DepthStencilPassOperation = descriptor.BackFaceStencil.DepthStencilPassOperation,
+                StencilCompareFunction = descriptor.BackFaceStencil.StencilCompareFunction,
+                ReadMask = descriptor.BackFaceStencil.ReadMask,
+                WriteMask = descriptor.BackFaceStencil.WriteMask
+            };
+
+            // Depth
+            hash.DepthCompareFunction = descriptor.DepthCompareFunction;
+            hash.DepthWriteEnabled = descriptor.DepthWriteEnabled;
+
+            return hash;
+        }
+
+        protected override MTLDepthStencilState CreateValue(MTLDepthStencilDescriptor descriptor)
+        {
+            return _device.NewDepthStencilState(descriptor);
+        }
+    }
+}
diff --git a/src/Ryujinx.Graphics.Metal/EncoderStateManager.cs b/src/Ryujinx.Graphics.Metal/EncoderStateManager.cs
index 2c6893c92f..fc8be20c18 100644
--- a/src/Ryujinx.Graphics.Metal/EncoderStateManager.cs
+++ b/src/Ryujinx.Graphics.Metal/EncoderStateManager.cs
@@ -16,6 +16,7 @@ namespace Ryujinx.Graphics.Metal
         private readonly Pipeline _pipeline;
 
         private readonly RenderPipelineCache RenderPipelineCache;
+        private readonly DepthStencilCache DepthStencilCache;
 
         private EncoderState _currentState = new();
         private EncoderState _backState = new();
@@ -32,6 +33,7 @@ namespace Ryujinx.Graphics.Metal
             _device = device;
             _pipeline = pipeline;
             RenderPipelineCache = new(device);
+            DepthStencilCache = new(device);
         }
 
         public void SwapStates()
@@ -328,7 +330,7 @@ namespace Ryujinx.Graphics.Metal
                 descriptor.FrontFaceStencil = _currentState.FrontFaceStencil;
             }
 
-            _currentState.DepthStencilState = _device.NewDepthStencilState(descriptor);
+            _currentState.DepthStencilState = DepthStencilCache.GetOrCreate(descriptor);
 
             // Mark dirty
             _currentState.Dirty.DepthStencil = true;
@@ -352,7 +354,7 @@ namespace Ryujinx.Graphics.Metal
                 descriptor.FrontFaceStencil = _currentState.FrontFaceStencil;
             }
 
-            _currentState.DepthStencilState = _device.NewDepthStencilState(descriptor);
+            _currentState.DepthStencilState = DepthStencilCache.GetOrCreate(descriptor);
 
             // Mark dirty
             _currentState.Dirty.DepthStencil = true;