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sdlayer.c: Add high-resolution timer for OS X, using mach_absolute_time().

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git-svn-id: https://svn.eduke32.com/eduke32@2861 1a8010ca-5511-0410-912e-c29ae57300e0
This commit is contained in:
helixhorned 2012-08-02 10:52:41 +00:00
parent b7cfd2fe2c
commit 569f0dbe7c
1 changed files with 16 additions and 3 deletions
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19
polymer/eduke32/build/src/sdlayer.c
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@ -27,6 +27,8 @@
#if defined __APPLE__
# include "osxbits.h"
# include <mach/mach.h>
# include <mach/mach_time.h>
#elif defined HAVE_GTK2
# include "gtkbits.h"
#endif
@ -847,7 +849,7 @@ uint32_t getticks(void)
uint64_t gethiticks(void)
{
#if (SDL_MAJOR_VERSION == 1 && SDL_MINOR_VERSION < 3) // SDL 1.2
# if defined __linux && _POSIX_TIMERS>0 && defined _POSIX_MONOTONIC_CLOCK
# if _POSIX_TIMERS>0 && defined _POSIX_MONOTONIC_CLOCK
// This is SDL HG's SDL_GetPerformanceCounter() when clock_gettime() is
// available.
uint64_t ticks;
@ -858,7 +860,12 @@ uint64_t gethiticks(void)
ticks *= 1000000000;
ticks += now.tv_nsec;
return (ticks);
# elif defined __APPLE__
return mach_absolute_time();
# else
// Blar. This pragma is unsupported on earlier GCC versions.
// At least we'll get a warning and a reference to this line...
# pragma message "Using low-resolution (1ms) timer for gethiticks. Profiling will work badly."
return SDL_GetTicks();
# endif
#else
@ -869,10 +876,16 @@ uint64_t gethiticks(void)
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
# if _POSIX_TIMERS>0 && defined _POSIX_MONOTONIC_CLOCK
return 1000000000;
# endif
# elif defined __APPLE__
static mach_timebase_info_data_t ti;
if (ti.denom == 0)
(void)mach_timebase_info(&ti); // ti.numer/ti.denom: nsec/(m_a_t() tick)
return (1000000000LL*ti.denom)/ti.numer;
# else
return 1000;
# endif
#else // SDL 1.3
return SDL_GetPerformanceFrequency();
#endif