dps

src/client/utilities/Dpr.ts

@@ -0,0 +1,10 @@
+// Cap the effective devicePixelRatio used for the WebGL drawing buffer and
+// any pixel-aware HUD math. Above 1.5×, low-end integrated GPU compositors
+// (notably older Chromebooks) can't swap the drawing buffer within a vsync
+// interval and frame pacing collapses. All callers must agree on this value
+// or camera ↔ screen coordinate math will desync.
+const MAX_RENDER_DPR = 1.5;
+
+export function getEffectiveDpr(): number {
+  return Math.min(window.devicePixelRatio || 1, MAX_RENDER_DPR);
+}