From 0435b4a96e873da8689267b41a9951d4b27008e0 Mon Sep 17 00:00:00 2001
From: Matt Parker <61717342+MattParkerDev@users.noreply.github.com>
Date: Sat, 6 Dec 2025 13:23:00 +1000
Subject: [PATCH] Dynamically set max fps

---
 src/SharpIDE.Godot/IdeWindow.cs  | 11 +++++++++++
 src/SharpIDE.Godot/project.godot |  2 +-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/SharpIDE.Godot/IdeWindow.cs b/src/SharpIDE.Godot/IdeWindow.cs
index 56c4146..5712031 100644
--- a/src/SharpIDE.Godot/IdeWindow.cs
+++ b/src/SharpIDE.Godot/IdeWindow.cs
@@ -25,6 +25,7 @@ public partial class IdeWindow : Control
         GD.Print("IdeWindow _Ready called");
         ResourceLoader.LoadThreadedRequest(SlnPickerScenePath);
         ResourceLoader.LoadThreadedRequest(IdeRootScenePath);
+        SetMaxFpsForMonitor();
         // Godot doesn't have an easy equivalent of launchsettings.json, and we also want this to be set for published builds
         Environment.SetEnvironmentVariable("MSBUILD_PARSE_SLN_WITH_SOLUTIONPERSISTENCE", "1");
         SharpIdeMsbuildLocator.Register();
@@ -45,6 +46,16 @@ public partial class IdeWindow : Control
         // GC.Collect();
         // PrintOrphanNodes();
     }
+
+    public void SetMaxFpsForMonitor()
+    {
+        // Keep max fps below display refresh rate for gsync, to avoid input lag. Currently does not handle window moving across monitors
+        var refreshRate = (int)DisplayServer.ScreenGetRefreshRate();
+        var refreshRateBelowCap = refreshRate - (refreshRate * refreshRate) / 3600.0;
+        var refreshRateBelowCapRoundedDownToInt = (int)refreshRateBelowCap;
+        GD.Print($"Detected display refresh rate: {refreshRate} Hz, setting max FPS to {refreshRateBelowCapRoundedDownToInt} Hz");
+        Engine.MaxFps = refreshRateBelowCapRoundedDownToInt;
+    }
     
     public void PickSolution(bool fullscreen = false)
     {
diff --git a/src/SharpIDE.Godot/project.godot b/src/SharpIDE.Godot/project.godot
index f2deb07..968c8d5 100644
--- a/src/SharpIDE.Godot/project.godot
+++ b/src/SharpIDE.Godot/project.godot
@@ -13,7 +13,7 @@ config_version=5
 config/name="SharpIDE"
 run/main_scene="uid://b70jhun5a4las"
 config/features=PackedStringArray("4.5", "C#", "Forward Plus")
-run/max_fps=157
+run/max_fps=60
 boot_splash/fullsize=false
 boot_splash/image="uid://c58xmy2syss8s"
 config/icon="uid://tpjfx7mo6cwj"