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SDL layer: tweak high-resolution timers for profiling, add gethitickms().

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For SDL 1.2 and when building on linux, the code using
clock_gettime(CLOCK_MONOTINIC, ...) is taken over from SDL HG.
gethitickms() is a convenience function that return milliseconds as
doubles and isn't exposed in any header file, yet.

git-svn-id: https://svn.eduke32.com/eduke32@2778 1a8010ca-5511-0410-912e-c29ae57300e0
This commit is contained in:
helixhorned 2012-06-22 21:39:57 +00:00
parent ed5e5b5881
commit bfd1700ceb
1 changed files with 39 additions and 12 deletions
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63
polymer/eduke32/build/src/sdlayer.c
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@ -778,8 +778,10 @@ void releaseallbuttons(void)
static Uint32 timerfreq=0;
static Uint32 timerlastsample=0;
int32_t timerticspersec=0;
static double hiticksperms = 1e308;
static void(*usertimercallback)(void) = NULL;
//
// inittimer() -- initialize timer
//
@ -795,6 +797,8 @@ int32_t inittimer(int32_t tickspersecond)
usertimercallback = NULL;
hiticksperms = (double)gethitickspersec() / 1000;
return 0;
}
@ -806,6 +810,8 @@ void uninittimer(void)
if (!timerfreq) return;
timerfreq=0;
hiticksperms = 1e308;
}
//
@ -838,27 +844,48 @@ uint32_t getticks(void)
}
// high-resolution timers for profiling
uint64_t gethiticks(void)
{
#if (SDL_MAJOR_VERSION == 1 && SDL_MINOR_VERSION < 3) // SDL 1.2
uint64_t gethiticks(void)
{
# if defined __linux && _POSIX_TIMERS>0 && defined _POSIX_MONOTONIC_CLOCK
// This is SDL HG's SDL_GetPerformanceCounter() when clock_gettime() is
// available.
uint64_t ticks;
struct timespec now;
clock_gettime(CLOCK_MONOTONIC, &now);
ticks = now.tv_sec;
ticks *= 1000000000;
ticks += now.tv_nsec;
return (ticks);
# else
return SDL_GetTicks();
}
uint64_t gethitickspersec(void)
{
return 1000;
}
#else // SDL 1.3
uint64_t gethiticks(void)
{
return SDL_GetPerformanceCounter();
}
uint64_t gethitickspersec(void)
{
return SDL_GetPerformanceFrequency();
}
# endif
#else
return SDL_GetPerformanceCounter();
#endif
}
uint64_t gethitickspersec(void)
{
#if (SDL_MAJOR_VERSION == 1 && SDL_MINOR_VERSION < 3) // SDL 1.2
# if defined __linux && _POSIX_TIMERS>0 && defined _POSIX_MONOTONIC_CLOCK
return 1000000000;
# endif
return 1000;
#else // SDL 1.3
return SDL_GetPerformanceFrequency();
#endif
}
// TODO: winlayer too
// Returns the time since an unspecified starting time in milliseconds.
// (May be not monotonic for certain configurations.)
ATTRIBUTE((flatten))
double gethitickms(void)
{
return (double)gethiticks() / hiticksperms;
}
//
// gettimerfreq() -- returns the number of ticks per second the timer is configured to generate