From 395a6cc218e8e796af94aaa196ac736786ac85f1 Mon Sep 17 00:00:00 2001
From: Isaac Marovitz <isaacryu@icloud.com>
Date: Fri, 31 May 2024 11:43:26 +0100
Subject: [PATCH] Depth Bias

---
 src/Ryujinx.Graphics.Metal/EncoderState.cs    |  4 ++++
 .../EncoderStateManager.cs                    | 22 +++++++++++++++++++
 src/Ryujinx.Graphics.Metal/Pipeline.cs        |  2 +-
 3 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/src/Ryujinx.Graphics.Metal/EncoderState.cs b/src/Ryujinx.Graphics.Metal/EncoderState.cs
index a75ea3dc9..deee78a60 100644
--- a/src/Ryujinx.Graphics.Metal/EncoderState.cs
+++ b/src/Ryujinx.Graphics.Metal/EncoderState.cs
@@ -51,6 +51,10 @@ namespace Ryujinx.Graphics.Metal
         public MTLCompareFunction DepthCompareFunction = MTLCompareFunction.Always;
         public bool DepthWriteEnabled = false;
 
+        public float DepthBias;
+        public float SlopeScale;
+        public float Clamp;
+
         public MTLStencilDescriptor BackFaceStencil = new();
         public MTLStencilDescriptor FrontFaceStencil = new();
         public int BackRefValue = 0;
diff --git a/src/Ryujinx.Graphics.Metal/EncoderStateManager.cs b/src/Ryujinx.Graphics.Metal/EncoderStateManager.cs
index 0ca7dbd2d..74bdc4258 100644
--- a/src/Ryujinx.Graphics.Metal/EncoderStateManager.cs
+++ b/src/Ryujinx.Graphics.Metal/EncoderStateManager.cs
@@ -79,6 +79,7 @@ namespace Ryujinx.Graphics.Metal
                 // Set all the inline state, since it might have changed
                 var renderCommandEncoder = _pipeline.GetOrCreateRenderEncoder();
                 SetDepthClamp(renderCommandEncoder);
+                SetDepthBias(renderCommandEncoder);
                 SetScissors(renderCommandEncoder);
                 SetViewports(renderCommandEncoder);
                 SetVertexBuffers(renderCommandEncoder, _currentState.VertexBuffers);
@@ -165,6 +166,7 @@ namespace Ryujinx.Graphics.Metal
 
             // Rebind all the state
             SetDepthClamp(renderCommandEncoder);
+            SetDepthBias(renderCommandEncoder);
             SetCullMode(renderCommandEncoder);
             SetFrontFace(renderCommandEncoder);
             SetStencilRefValue(renderCommandEncoder);
@@ -561,6 +563,21 @@ namespace Ryujinx.Graphics.Metal
             }
         }
 
+        // Inlineable
+        public void UpdateDepthBias(float depthBias, float slopeScale, float clamp)
+        {
+            _currentState.DepthBias = depthBias;
+            _currentState.SlopeScale = slopeScale;
+            _currentState.Clamp = clamp;
+
+            // Inline update
+            if (_pipeline.CurrentEncoderType == EncoderType.Render && _pipeline.CurrentEncoder != null)
+            {
+                var renderCommandEncoder = new MTLRenderCommandEncoder(_pipeline.CurrentEncoder.Value);
+                SetDepthBias(renderCommandEncoder);
+            }
+        }
+
         // Inlineable
         public void UpdateScissors(ReadOnlySpan<Rectangle<int>> regions)
         {
@@ -839,6 +856,11 @@ namespace Ryujinx.Graphics.Metal
             renderCommandEncoder.SetDepthClipMode(_currentState.DepthClipMode);
         }
 
+        private readonly void SetDepthBias(MTLRenderCommandEncoder renderCommandEncoder)
+        {
+            renderCommandEncoder.SetDepthBias(_currentState.DepthBias, _currentState.SlopeScale, _currentState.Clamp);
+        }
+
         private unsafe void SetScissors(MTLRenderCommandEncoder renderCommandEncoder)
         {
             if (_currentState.Scissors.Length > 0)
diff --git a/src/Ryujinx.Graphics.Metal/Pipeline.cs b/src/Ryujinx.Graphics.Metal/Pipeline.cs
index 7cdc2c6d8..34c4d30cb 100644
--- a/src/Ryujinx.Graphics.Metal/Pipeline.cs
+++ b/src/Ryujinx.Graphics.Metal/Pipeline.cs
@@ -388,7 +388,7 @@ namespace Ryujinx.Graphics.Metal
 
         public void SetDepthBias(PolygonModeMask enables, float factor, float units, float clamp)
         {
-            Logger.Warning?.Print(LogClass.Gpu, "Not Implemented!");
+            _encoderStateManager.UpdateDepthBias(units, factor, clamp);
         }
 
         public void SetDepthClamp(bool clamp)