From 426cbfccba65f469987a68e1ff5c9b2caff26482 Mon Sep 17 00:00:00 2001
From: Matt Mascarenhas <matt@handmadedev.org>
Date: Tue, 15 May 2018 20:45:03 +0100
Subject: [PATCH] cinera_player_pre.js: Use YouTube API's timer

This lets users of Firefox 59+ get sub-millisecond accurate performance:
https://developer.mozilla.org/en-US/docs/Web/API/Performance/now
---
 cinera/cinera.c             | 3 ++-
 cinera/cinera_player_pre.js | 6 +-----
 2 files changed, 3 insertions(+), 6 deletions(-)

diff --git a/cinera/cinera.c b/cinera/cinera.c
index c61c878..7672db7 100644
--- a/cinera/cinera.c
+++ b/cinera/cinera.c
@@ -16,7 +16,7 @@ typedef struct
 version CINERA_APP_VERSION = {
     .Major = 0,
     .Minor = 5,
-    .Patch = 50
+    .Patch = 51
 };
 
 // TODO(matt): Copy in the DB 3 stuff from cinera_working.c
@@ -787,6 +787,7 @@ StringsDifferT(char *A, // NOTE(matt): Null-terminated string
                char Terminator // NOTE(matt): Caller definable terminator. Pass 0 to only match on the extent of A
                )
 {
+    // TODO(matt): Make sure this can't crash upon reaching the end of B's buffer
     int ALength = StringLength(A);
     int i = 0;
     while(i < ALength && A[i] && A[i] == B[i])
diff --git a/cinera/cinera_player_pre.js b/cinera/cinera_player_pre.js
index 035340f..2a7ee7c 100644
--- a/cinera/cinera_player_pre.js
+++ b/cinera/cinera_player_pre.js
@@ -43,7 +43,6 @@ function Player(htmlContainer, refsCallback) {
     this.pauseAfterBuffer = false;
     this.speed = 1;
     this.currentTime = -1;
-    this.lastFrameTime = 0;
     this.scrollTo = -1;
     this.scrollPosition = 0;
     this.nextFrame = null;
@@ -250,11 +249,8 @@ Player.prototype.updateProgress = function() {
 };
 
 Player.prototype.doFrame = function() {
-    var now = performance.now();
-    var delta = (now - this.lastFrameTime) / 1000.0;
-    this.lastFrameTime = now;
     if (this.playing) {
-        this.currentTime += delta * this.speed;
+        this.currentTime = this.youtubePlayer.getCurrentTime();
     }
     this.updateProgress();