Better update accuracy on windows

Mulwasteve · Feb 22, 2023 · dbd3a12 · dbd3a12
1 parent efb6ab7
commit dbd3a12
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Showing 2 changed files with 19 additions and 3 deletions.
diff --git a/src/OpenTK.Windowing.Desktop/GameWindow.cs b/src/OpenTK.Windowing.Desktop/GameWindow.cs
@@ -9,6 +9,7 @@
 
 using System;
 using System.Diagnostics;
+using System.Runtime.InteropServices;
 using System.Threading;
 using OpenTK.Windowing.Common;
 using OpenTK.Windowing.GraphicsLibraryFramework;
@@ -201,6 +202,12 @@ public GameWindow(GameWindowSettings gameWindowSettings, NativeWindowSettings na
             UpdateFrequency = gameWindowSettings.UpdateFrequency;
         }
 
+        [DllImport("winmm")]
+        private static extern uint timeBeginPeriod(uint uPeriod);
+
+        [DllImport("winmm")]
+        private static extern uint timeEndPeriod(uint uPeriod);
+
         /// <summary>
         /// Initialize the update thread (if using a multi-threaded context, and enter the game loop of the GameWindow).
         /// </summary>
@@ -209,6 +216,11 @@ public virtual unsafe void Run()
             // Make sure that the gl contexts is current for OnLoad and the initial OnResize
             Context?.MakeCurrent();
 
+            if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+            {
+                timeBeginPeriod(1);
+            }
+
             // Send the OnLoad event, to load all user code.
             OnLoad();
 
@@ -246,6 +258,8 @@ public virtual unsafe void Run()
             }
 
             OnUnload();
+
+            timeEndPeriod(1);
         }
 
         private unsafe void StartRenderThread()

diff --git a/tests/LocalTest/Program.cs b/tests/LocalTest/Program.cs
@@ -14,8 +14,8 @@ static void Main(string[] args)
         {
             GameWindowSettings gwSettings = new GameWindowSettings()
             {
-                //UpdateFrequency = 10,
-                //RenderFrequency = 10,
+                // UpdateFrequency = 60,
+                // RenderFrequency = 60,
             };
 
             NativeWindowSettings nwSettings = new NativeWindowSettings()
@@ -28,7 +28,7 @@ static void Main(string[] args)
                 Profile = ContextProfile.Core,
                 Size = (800, 600),
                 StartFocused = true,
-                StartVisible = false,
+                StartVisible = true,
                 Title = "Local OpenTK Test",
                 WindowBorder = WindowBorder.Resizable,
                 WindowState = WindowState.Normal,
@@ -58,6 +58,8 @@ protected override void OnRenderFrame(FrameEventArgs args)
             GL.ClearColor(Color4.Coral);
             GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
 
+            Console.WriteLine($"{1/args.Time:0.000}");
+
             SwapBuffers();
         }