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[client] implemented better clock drift correction
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f5da432d38
commit
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@ -154,28 +154,23 @@ static int renderThread(void * unused)
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while(state.running)
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{
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// if our clock is too far out of sync, resync it
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// this can happen when switching to/from a TTY, or due to clock drift
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// we only check this once every 100 frames
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if (state.frameTime > 0 && ++resyncCheck == 100)
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if (state.frameTime > 0)
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{
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resyncCheck = 0;
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tsAdd(&time, state.frameTime);
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struct timespec tmp;
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clock_gettime(CLOCK_REALTIME, &tmp);
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if (tmp.tv_nsec - time.tv_nsec < 0)
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// if our clock is too far out of sync, resync it
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// this can happen when switching to/from a TTY, or due to clock drift
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// we only check this once every 100 frames
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if (++resyncCheck == 100)
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{
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tmp.tv_sec -= time.tv_sec - 1;
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tmp.tv_nsec = 1000000000 + tmp.tv_nsec - time.tv_nsec;
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}
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else
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{
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tmp.tv_sec -= time.tv_sec;
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tmp.tv_nsec -= time.tv_nsec;
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}
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resyncCheck = 0;
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if (tmp.tv_sec > 1)
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clock_gettime(CLOCK_REALTIME, &time);
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struct timespec end, diff;
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clock_gettime(CLOCK_REALTIME, &end);
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tsDiff(&diff, &time, &end);
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if (diff.tv_sec > 0 || diff.tv_nsec > 1000000000) // 100ms
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clock_gettime(CLOCK_REALTIME, &time);
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}
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}
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if (state.lgrResize)
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@ -218,18 +213,7 @@ static int renderThread(void * unused)
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}
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if (state.frameTime > 0)
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{
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uint64_t nsec = time.tv_nsec + state.frameTime;
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if(nsec > 1e9)
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{
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time.tv_nsec = nsec - 1e9;
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++time.tv_sec;
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}
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else
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time.tv_nsec = nsec;
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lgWaitEventAbs(e_frame, &time);
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}
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}
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state.running = false;
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@ -66,6 +66,42 @@ static inline void nsleep(uint64_t ns)
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};
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nanosleep(&ts, NULL);
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}
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static inline void tsDiff(struct timespec *diff, const struct timespec *left,
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const struct timespec *right)
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{
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diff->tv_sec = left->tv_sec - right->tv_sec;
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diff->tv_nsec = left->tv_nsec - right->tv_nsec;
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if (diff->tv_nsec < 0)
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{
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--diff->tv_sec;
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diff->tv_nsec += 1000000000;
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}
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}
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static inline uint32_t __iter_div_u64_rem(uint64_t dividend, uint32_t divisor, uint64_t *remainder)
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{
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uint32_t ret = 0;
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while (dividend >= divisor) {
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/* The following asm() prevents the compiler from
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optimising this loop into a modulo operation. */
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asm("" : "+rm"(dividend));
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dividend -= divisor;
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ret++;
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}
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*remainder = dividend;
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return ret;
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}
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static inline void tsAdd(struct timespec *a, uint64_t ns)
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{
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a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, 1000000000L, &ns);
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a->tv_nsec = ns;
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}
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#endif
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typedef bool (*LGTimerFn)(void * udata);
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