From b3a8512129d84c2375b8250ca7bb16606aab9136 Mon Sep 17 00:00:00 2001
From: Dennis Ranke <dennis.ranke@gmail.com>
Date: Fri, 7 Apr 2023 17:08:04 +0200
Subject: [PATCH] update frame pacing calculation in web runtime

fixes carts running too slow in chrome
---
 web/src/microw8.js | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/web/src/microw8.js b/web/src/microw8.js
index dcdc845..d457702 100644
--- a/web/src/microw8.js
+++ b/web/src/microw8.js
@@ -274,7 +274,7 @@ export default function MicroW8(screen, config = {}) {
     
                 try {
                     let restart = false;
-                    let thisFrame;
+                    let nextFrame = 0;
                     if (!isPaused) {
                         let gamepads = navigator.getGamepads();
                         let gamepad = 0;
@@ -321,13 +321,12 @@ export default function MicroW8(screen, config = {}) {
                         }
                         canvasCtx.putImageData(imageData, 0, 0);
 
-                        let timeOffset = ((time * 6) % 100 - 50) / 6;
-                        thisFrame = startTime + time - timeOffset / 8;
-                    } else {
-                        thisFrame = Date.now();
+                        let thisFrame = Math.floor(time * 6 / 100);
+                        let timeOffset = time - thisFrame * 100 / 6;
+                        nextFrame = Math.ceil(startTime + (thisFrame + 1) * 100 / 6 + Math.min(4, timeOffset));
                     }
                     let now = Date.now();
-                    let nextFrame = Math.max(thisFrame + timePerFrame, now);
+                    nextFrame = Math.max(nextFrame, now);
     
                     if (restart) {
                         runModule(currentData);