From b46b63e06a36845175f68331edb5ddeeb34de27b Mon Sep 17 00:00:00 2001
From: gdkchan <gab.dark.100@gmail.com>
Date: Tue, 5 Jul 2022 19:58:36 -0300
Subject: Add support for alpha to coverage dithering (#3069)

* Add support for alpha to coverage dithering

* Shader cache version bump

* Fix wrong alpha register

* Ensure support buffer is cleared

* New shader specialization based approach
---
 Ryujinx.Graphics.OpenGL/Pipeline.cs | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

(limited to 'Ryujinx.Graphics.OpenGL/Pipeline.cs')

diff --git a/Ryujinx.Graphics.OpenGL/Pipeline.cs b/Ryujinx.Graphics.OpenGL/Pipeline.cs
index 62d4dee9..fde86424 100644
--- a/Ryujinx.Graphics.OpenGL/Pipeline.cs
+++ b/Ryujinx.Graphics.OpenGL/Pipeline.cs
@@ -918,6 +918,34 @@ namespace Ryujinx.Graphics.OpenGL
             }
         }
 
+        public void SetMultisampleState(MultisampleDescriptor multisample)
+        {
+            if (multisample.AlphaToCoverageEnable)
+            {
+                GL.Enable(EnableCap.SampleAlphaToCoverage);
+
+                if (multisample.AlphaToOneEnable)
+                {
+                    GL.Enable(EnableCap.SampleAlphaToOne);
+                }
+                else
+                {
+                    GL.Disable(EnableCap.SampleAlphaToOne);
+                }
+
+                if (HwCapabilities.SupportsAlphaToCoverageDitherControl)
+                {
+                    GL.NV.AlphaToCoverageDitherControl(multisample.AlphaToCoverageDitherEnable
+                        ? NvAlphaToCoverageDitherControl.AlphaToCoverageDitherEnableNv
+                        : NvAlphaToCoverageDitherControl.AlphaToCoverageDitherDisableNv);
+                }
+            }
+            else
+            {
+                GL.Disable(EnableCap.SampleAlphaToCoverage);
+            }
+        }
+
         public void SetLineParameters(float width, bool smooth)
         {
             if (smooth)
-- 
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