From c532118d94dea0bbafff7b92000c1a25cd4e021d Mon Sep 17 00:00:00 2001
From: gdkchan <gab.dark.100@gmail.com>
Date: Wed, 5 Apr 2023 00:25:19 -0300
Subject: Use index fragment shader output when dual source blend is enabled
 (#4404)

* Use index fragment shader output when dual source blend is enabled

* Shader cache version bump

* Actually set DualSourceBlendEnabled to true

* Fix XML doc

---------

Co-authored-by: Ac_K <Acoustik666@gmail.com>
---
 .../Engine/Threed/SpecializationStateUpdater.cs    | 14 ++++++++++++++
 Ryujinx.Graphics.Gpu/Engine/Threed/StateUpdater.cs | 22 ++++++++++++++++++++++
 2 files changed, 36 insertions(+)

(limited to 'Ryujinx.Graphics.Gpu/Engine')

diff --git a/Ryujinx.Graphics.Gpu/Engine/Threed/SpecializationStateUpdater.cs b/Ryujinx.Graphics.Gpu/Engine/Threed/SpecializationStateUpdater.cs
index 62df15e7..a8af5497 100644
--- a/Ryujinx.Graphics.Gpu/Engine/Threed/SpecializationStateUpdater.cs
+++ b/Ryujinx.Graphics.Gpu/Engine/Threed/SpecializationStateUpdater.cs
@@ -328,5 +328,19 @@ namespace Ryujinx.Graphics.Gpu.Engine.Threed
                 Signal();
             }
         }
+
+        /// <summary>
+        /// Sets the dual-source blend enabled state.
+        /// </summary>
+        /// <param name="enabled">True if blending is enabled and using dual-source blend</param>
+        public void SetDualSourceBlendEnabled(bool enabled)
+        {
+            if (enabled != _graphics.DualSourceBlendEnable)
+            {
+                _graphics.DualSourceBlendEnable = enabled;
+
+                Signal();
+            }
+        }
     }
 }
diff --git a/Ryujinx.Graphics.Gpu/Engine/Threed/StateUpdater.cs b/Ryujinx.Graphics.Gpu/Engine/Threed/StateUpdater.cs
index d7d197ad..00e09a31 100644
--- a/Ryujinx.Graphics.Gpu/Engine/Threed/StateUpdater.cs
+++ b/Ryujinx.Graphics.Gpu/Engine/Threed/StateUpdater.cs
@@ -1183,6 +1183,8 @@ namespace Ryujinx.Graphics.Gpu.Engine.Threed
             bool blendIndependent = _state.State.BlendIndependent;
             ColorF blendConstant = _state.State.BlendConstant;
 
+            bool dualSourceBlendEnabled = false;
+
             if (blendIndependent)
             {
                 for (int index = 0; index < Constants.TotalRenderTargets; index++)
@@ -1200,6 +1202,15 @@ namespace Ryujinx.Graphics.Gpu.Engine.Threed
                         FilterBlendFactor(blend.AlphaSrcFactor, index),
                         FilterBlendFactor(blend.AlphaDstFactor, index));
 
+                    if (enable &&
+                        (blend.ColorSrcFactor.IsDualSource() ||
+                        blend.ColorDstFactor.IsDualSource() ||
+                        blend.AlphaSrcFactor.IsDualSource() ||
+                        blend.AlphaDstFactor.IsDualSource()))
+                    {
+                        dualSourceBlendEnabled = true;
+                    }
+
                     _pipeline.BlendDescriptors[index] = descriptor;
                     _context.Renderer.Pipeline.SetBlendState(index, descriptor);
                 }
@@ -1219,12 +1230,23 @@ namespace Ryujinx.Graphics.Gpu.Engine.Threed
                     FilterBlendFactor(blend.AlphaSrcFactor, 0),
                     FilterBlendFactor(blend.AlphaDstFactor, 0));
 
+                if (enable &&
+                    (blend.ColorSrcFactor.IsDualSource() ||
+                    blend.ColorDstFactor.IsDualSource() ||
+                    blend.AlphaSrcFactor.IsDualSource() ||
+                    blend.AlphaDstFactor.IsDualSource()))
+                {
+                    dualSourceBlendEnabled = true;
+                }
+
                 for (int index = 0; index < Constants.TotalRenderTargets; index++)
                 {
                     _pipeline.BlendDescriptors[index] = descriptor;
                     _context.Renderer.Pipeline.SetBlendState(index, descriptor);
                 }
             }
+
+            _currentSpecState.SetDualSourceBlendEnabled(dualSourceBlendEnabled);
         }
 
         /// <summary>
-- 
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