From 3707b7f49bd9066084c3253c75eae0a25298f6d0 Mon Sep 17 00:00:00 2001
From: Nick Fisher <nick.fisher@polyvox.app>
Date: Fri, 21 Apr 2023 08:44:15 +0800
Subject: [PATCH] tick at lower framerate if specified

---
 lib/filament_controller.dart | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/lib/filament_controller.dart b/lib/filament_controller.dart
index 495ed5b4..9d709079 100644
--- a/lib/filament_controller.dart
+++ b/lib/filament_controller.dart
@@ -77,7 +77,10 @@ class FilamentController {
     _nativeLibrary.render(_viewer, 0);
   }
 
+  int _frameLengthInMicroseconds = 1000000 ~/ 60;
+
   Future setFrameRate(int framerate) async {
+    _frameLengthInMicroseconds = 1000000 ~/ framerate;
     _nativeLibrary.set_frame_interval(_viewer, 1 / framerate);
   }
 
@@ -85,6 +88,8 @@ class FilamentController {
     _pixelRatio = ratio;
   }
 
+  int _last = 0;
+
   Future createViewer(int width, int height) async {
     size = ui.Size(width * _pixelRatio, height * _pixelRatio);
     _textureId =
@@ -125,8 +130,11 @@ class FilamentController {
     _initialized.complete(true);
     _assetManager = _nativeLibrary.get_asset_manager(_viewer);
 
-    _ticker = _tickerProvider.createTicker((elapsed) async {
-      _nativeLibrary.render(_viewer, 0);
+    _ticker = _tickerProvider.createTicker((Duration elapsed) async {
+      if (elapsed.inMicroseconds - _last > _frameLengthInMicroseconds) {
+        render();
+        _last = elapsed.inMicroseconds;
+      }
     });
     _ticker!.start();
   }