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[client] implemented better clock drift correction

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This commit is contained in:
Geoffrey McRae
2020-05-22 20:45:59 +10:00
parent f5da432d38
commit 4441427943
3 changed files with 50 additions and 30 deletions
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42
client/src/main.c
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@@ -154,28 +154,23 @@ static int renderThread(void * unused)
while(state.running)
{
// if our clock is too far out of sync, resync it
// this can happen when switching to/from a TTY, or due to clock drift
// we only check this once every 100 frames
if (state.frameTime > 0 && ++resyncCheck == 100)
if (state.frameTime > 0)
{
resyncCheck = 0;
tsAdd(&time, state.frameTime);
struct timespec tmp;
clock_gettime(CLOCK_REALTIME, &tmp);
if (tmp.tv_nsec - time.tv_nsec < 0)
// if our clock is too far out of sync, resync it
// this can happen when switching to/from a TTY, or due to clock drift
// we only check this once every 100 frames
if (++resyncCheck == 100)
{
tmp.tv_sec -= time.tv_sec - 1;
tmp.tv_nsec = 1000000000 + tmp.tv_nsec - time.tv_nsec;
}
else
{
tmp.tv_sec -= time.tv_sec;
tmp.tv_nsec -= time.tv_nsec;
}
resyncCheck = 0;
if (tmp.tv_sec > 1)
clock_gettime(CLOCK_REALTIME, &time);
struct timespec end, diff;
clock_gettime(CLOCK_REALTIME, &end);
tsDiff(&diff, &time, &end);
if (diff.tv_sec > 0 || diff.tv_nsec > 1000000000) // 100ms
clock_gettime(CLOCK_REALTIME, &time);
}
}
if (state.lgrResize)
@@ -218,18 +213,7 @@ static int renderThread(void * unused)
}
if (state.frameTime > 0)
{
uint64_t nsec = time.tv_nsec + state.frameTime;
if(nsec > 1e9)
{
time.tv_nsec = nsec - 1e9;
++time.tv_sec;
}
else
time.tv_nsec = nsec;
lgWaitEventAbs(e_frame, &time);
}
}
state.running = false;