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fix stupidly incorrect calculation of smoothed frequency and timer resolution (fixes observed dependence of sim rate on framerate, see http://www.wildfiregames.com/forum/index.php?showtopic=1671)

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also improved filtering of the frame delta times.
while at it, improved interface of whrt backends to avoid leaking
implementation details.

This was SVN commit r6401.
This commit is contained in:
janwas
2008-09-19 17:56:05 +00:00
parent 33ca85cb4c
commit c3a42633fa
15 changed files with 490 additions and 575 deletions
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source/lib/timer.cpp
+8 -6
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@@ -58,7 +58,9 @@ static struct timeval start;
void timer_LatchStartTime()
{
#if HAVE_CLOCK_GETTIME
#if OS_WIN
// whrt_Time starts at zero, nothing needs to be done.
#elif HAVE_CLOCK_GETTIME
(void)clock_gettime(CLOCK_REALTIME, &start);
#elif HAVE_GETTIMEOFDAY
gettimeofday(&start, 0);
@@ -103,17 +105,17 @@ double timer_Resolution()
double res = 0.0;
#if HAVE_CLOCK_GETTIME
#if OS_WIN
res = whrt_Resolution();
#elif HAVE_CLOCK_GETTIME
struct timespec ts;
if(clock_getres(CLOCK_REALTIME, &ts) == 0)
res = ts.tv_nsec * 1e-9;
#elif OS_WIN
res = whrt_Resolution();
#else
const double t0 = timer_Time();
double t1, t2;
do t1 = timer_Time(); while(t1 == t0);
do t2 = timer_Time(); while(t2 == t1);
do t1 = timer_Time(); while(t1 == t0);
do t2 = timer_Time(); while(t2 == t1);
res = t2-t1;
#endif