fix: cursor smooth movement on higher refreshrate monitors

src/lib/components/ui/osu-cursor/OsuCursor.svelte

@@ -101,7 +101,7 @@
       duration: smoothCursor ? $cursorSmoothness : 0,
       translateX: mouseX,
       translateY: mouseY,
-      ease: (t: number) => (t - 1) ** 5 + 1,
+      ease: (t: number) => t === 1 ? 1 : 1 - Math.pow(2, -10 * t),
     });
 
     animate(cursor, {

src/lib/displayUtils.ts

@@ -1,19 +1,21 @@
-export function estimateRefreshRate(): Promise<number> {
+export async function estimateFrameRate(): Promise<number> {
   return new Promise((resolve) => {
-    const last = performance.now();
+    const samples: number[] = [];
-    let frames = 0;
+    let last = performance.now();
 
-    function loop() {
+    const tick = () => {
       const now = performance.now();
-      frames++;
+      samples.push(now - last);
+      last = now;
 
-      if (now - last >= 1000) {
+      if (samples.length < 60) {
-        resolve(frames - 2);
+        requestAnimationFrame(tick);
       } else {
-        requestAnimationFrame(loop);
+        const avgDelta = samples.reduce((a, b) => a + b) / samples.length;
+        resolve(Math.round(1000 / avgDelta));
       }
-    }
+    };
 
-    requestAnimationFrame(loop);
+    requestAnimationFrame(tick);
   });
 }

src/screens/Loading.svelte

@@ -1,6 +1,6 @@
 <script lang="ts">
   import Logo from '$assets/logo.png';
-  import { estimateRefreshRate } from '@/displayUtils';
+  import { estimateFrameRate } from '@/displayUtils';
   import {
     beatmapSets,
     currentLoadingInfo,
@@ -67,15 +67,15 @@
   };
 
   const calculateCursorSmoothness = async () => {
-    const refreshRate = await estimateRefreshRate();
+    const refreshRate = await estimateFrameRate();
     const hzMin = 60;
-    const hzMax = 144;
+    const hzMax = 500;
-    const durationMin = 70;
+    const durationMin = 350;
-    const durationMax = 180;
+    const durationMax = 600;
-
+    const clamped = Math.min(Math.max(refreshRate, hzMin), hzMax);
     const duration =
-      durationMin + ((refreshRate - hzMin) / (hzMax - hzMin)) * (durationMax - durationMin);
+      durationMin + ((clamped - hzMin) / (hzMax - hzMin)) * (durationMax - durationMin);
-
+    console.log(Math.round(duration));
     cursorSmoothness.set(Math.round(duration));
   };