From 464a92d8a7082a86552d8776256fa763ded227f4 Mon Sep 17 00:00:00 2001
From: gdkchan <gab.dark.100@gmail.com>
Date: Tue, 12 Oct 2021 18:46:42 -0300
Subject: [PATCH] Force index buffer update for games using Vulkan (#2726)

---
 Ryujinx.Graphics.Gpu/Engine/Threed/DrawManager.cs | 1 +
 Ryujinx.Graphics.Gpu/Engine/Threed/ThreedClass.cs | 9 +++++++++
 2 files changed, 10 insertions(+)

diff --git a/Ryujinx.Graphics.Gpu/Engine/Threed/DrawManager.cs b/Ryujinx.Graphics.Gpu/Engine/Threed/DrawManager.cs
index 82aff2049..a060c6c96 100644
--- a/Ryujinx.Graphics.Gpu/Engine/Threed/DrawManager.cs
+++ b/Ryujinx.Graphics.Gpu/Engine/Threed/DrawManager.cs
@@ -312,6 +312,7 @@ namespace Ryujinx.Graphics.Gpu.Engine.Threed
             bool oldDrawIndexed = _drawState.DrawIndexed;
 
             _drawState.DrawIndexed = true;
+            engine.ForceStateDirty(IndexBufferCountMethodOffset * 4);
 
             DrawEnd(engine, firstIndex, indexCount);
 
diff --git a/Ryujinx.Graphics.Gpu/Engine/Threed/ThreedClass.cs b/Ryujinx.Graphics.Gpu/Engine/Threed/ThreedClass.cs
index 52637c20f..5478704ac 100644
--- a/Ryujinx.Graphics.Gpu/Engine/Threed/ThreedClass.cs
+++ b/Ryujinx.Graphics.Gpu/Engine/Threed/ThreedClass.cs
@@ -143,6 +143,15 @@ namespace Ryujinx.Graphics.Gpu.Engine.Threed
             _stateUpdater.SetAllDirty();
         }
 
+        /// <summary>
+        /// Marks the specified register offset as dirty, forcing the associated state to update on the next draw.
+        /// </summary>
+        /// <param name="offset">Register offset</param>
+        public void ForceStateDirty(int offset)
+        {
+            _stateUpdater.SetDirty(offset);
+        }
+
         /// <summary>
         /// Forces the shaders to be rebound on the next draw.
         /// </summary>