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libobs: use clock_gettime_nsec_np() for macOS

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macOS should use the function clock_gettime_nsec_np() to get the
current clock in nanoseconds, instead of manually using
mach_absolute_time() and manually adjusting the timebase. This
greatly simplifies the platform-specific code to manage the
current time in nanoseconds.
This commit is contained in:
Doug Kelly 2021-01-18 15:53:50 -08:00 committed by Jim
parent 9b699f65d7
commit 4ab5a3bea1
1 changed files with 1 additions and 36 deletions
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37
libobs/util/platform-cocoa.m
View file

@ -38,44 +38,9 @@
#include "apple/cfstring-utils.h"
/* clock function selection taken from libc++ */
static uint64_t ns_time_simple()
{
return mach_absolute_time();
}
static double ns_time_compute_factor()
{
mach_timebase_info_data_t info = {1, 1};
mach_timebase_info(&info);
return ((double)info.numer) / info.denom;
}
static uint64_t ns_time_full()
{
static double factor = 0.;
if (factor == 0.)
factor = ns_time_compute_factor();
return (uint64_t)(mach_absolute_time() * factor);
}
typedef uint64_t (*time_func)();
static time_func ns_time_select_func()
{
mach_timebase_info_data_t info = {1, 1};
mach_timebase_info(&info);
if (info.denom == info.numer)
return ns_time_simple;
return ns_time_full;
}
uint64_t os_gettime_ns(void)
{
static time_func f = NULL;
if (!f)
f = ns_time_select_func();
return f();
return clock_gettime_nsec_np(CLOCK_UPTIME_RAW);
}
/* gets the location [domain mask]/Library/Application Support/[name] */