From 076dd9a56abcb7180e39c7bb23631b31db7a7fd5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bar=C4=B1=C5=9F=20Hamil?= <barishamil90@gmail.com>
Date: Sun, 22 Jun 2025 00:39:02 +0300
Subject: [PATCH] Overlays: fix delta calculation

---
 src/Ryujinx.Graphics.Gpu/Window.cs | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/src/Ryujinx.Graphics.Gpu/Window.cs b/src/Ryujinx.Graphics.Gpu/Window.cs
index c5186c77b..7c023d5a8 100644
--- a/src/Ryujinx.Graphics.Gpu/Window.cs
+++ b/src/Ryujinx.Graphics.Gpu/Window.cs
@@ -21,7 +21,7 @@ namespace Ryujinx.Graphics.Gpu
     {
         private readonly GpuContext _context;
         private readonly OverlayManager _overlayManager;
-        private DateTime _lastUpdateTime = DateTime.UtcNow;
+        private DateTime? _lastUpdateTime = null;
 
         /// <summary>
         /// Texture presented on the window.
@@ -271,13 +271,16 @@ namespace Ryujinx.Graphics.Gpu
         {
             try
             {
-                // Calculate delta time for lifespan updates
                 DateTime currentTime = DateTime.UtcNow;
-                float deltaTime = (float)(currentTime - _lastUpdateTime).TotalSeconds;
-                _lastUpdateTime = currentTime;
+                if (_lastUpdateTime != null)
+                {
+                    // Calculate delta time for lifespan updates
+                    float deltaTime = (float)(currentTime - _lastUpdateTime.Value).TotalSeconds;
+                    _overlayManager.Update(deltaTime, new SKSize(texture.Info.Width, texture.Info.Height));
+                }
 
                 // Update overlay animations
-                _overlayManager.Update(deltaTime, new SKSize(texture.Info.Width, texture.Info.Height));
+                _lastUpdateTime = currentTime;
 
                 // Get texture data from host texture
                 using var pinnedData = texture.HostTexture.GetData();
@@ -301,7 +304,7 @@ namespace Ryujinx.Graphics.Gpu
                 // Create SKBitmap from texture data
                 var imageInfo = new SKImageInfo(width, height, colorType, SKAlphaType.Premul);
                 using var bitmap = new SKBitmap(imageInfo);
-                
+
                 // Copy texture data to bitmap
                 unsafe
                 {
@@ -313,7 +316,7 @@ namespace Ryujinx.Graphics.Gpu
 
                 // Create canvas for drawing overlays
                 using var canvas = new SKCanvas(bitmap);
-                
+
                 // On Linux with OpenGL, we need to flip the Y-axis because OpenGL uses bottom-left origin
                 // while SkiaSharp uses top-left origin
                 if (OperatingSystem.IsLinux())
@@ -321,7 +324,7 @@ namespace Ryujinx.Graphics.Gpu
                     canvas.Scale(1, -1);
                     canvas.Translate(0, -height);
                 }
-                
+
                 // Render all overlays
                 _overlayManager.Render(canvas);