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u/time: Add helper comparising functions

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This commit is contained in:
Jakob Bornecrantz 2021-04-05 22:51:26 +01:00
parent 5c15b60cf2
commit c876087ee7
1 changed files with 85 additions and 0 deletions
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85
src/xrt/auxiliary/util/u_time.h
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@ -93,6 +93,91 @@ time_s_to_ns(double duration)
return (time_duration_ns)(duration * (double)U_TIME_1S_IN_NS);
}
/*!
* Convert nanoseconds to double float milliseconds, useful for printing.
*
* @see timepoint_ns
* @ingroup aux_util
*/
static inline double
time_ns_to_ms_f(time_duration_ns ns)
{
return (double)(ns) / (double)U_TIME_1MS_IN_NS;
}
/*!
* Checks if two timepoints are with a certain range of each other.
*
* @see timepoint_ns
* @ingroup aux_util
*/
static inline bool
time_is_within_range_of_each_other(timepoint_ns a, timepoint_ns b, uint64_t range)
{
int64_t t = (int64_t)a - (int64_t)b;
return (-(int64_t)range < t) && (t < (int64_t)range);
}
/*!
* Checks if two timepoints are with half a millisecond of each other.
*
* @see timepoint_ns
* @ingroup aux_util
*/
static inline bool
time_is_within_half_ms(timepoint_ns a, timepoint_ns b)
{
return time_is_within_range_of_each_other(a, b, U_TIME_HALF_MS_IN_NS);
}
/*!
* Fuzzy comparisons.
*
* @see timepoint_ns
* @ingroup aux_util
*/
static inline bool
time_is_less_then_or_within_range(timepoint_ns a, timepoint_ns b, uint64_t range)
{
return a < b || time_is_within_range_of_each_other(a, b, range);
}
/*!
* Fuzzy comparisons.
*
* @see timepoint_ns
* @ingroup aux_util
*/
static inline bool
time_is_less_then_or_within_half_ms(timepoint_ns a, timepoint_ns b)
{
return time_is_less_then_or_within_range(a, b, U_TIME_HALF_MS_IN_NS);
}
/*!
* Fuzzy comparisons.
*
* @see timepoint_ns
* @ingroup aux_util
*/
static inline bool
time_is_greater_then_or_within_range(timepoint_ns a, timepoint_ns b, uint64_t range)
{
return a > b || time_is_within_range_of_each_other(a, b, range);
}
/*!
* Fuzzy comparisons.
*
* @see timepoint_ns
* @ingroup aux_util
*/
static inline bool
time_is_greater_then_or_within_half_ms(timepoint_ns a, timepoint_ns b)
{
return time_is_greater_then_or_within_range(a, b, U_TIME_HALF_MS_IN_NS);
}
/*!
* @struct time_state util/u_time.h
* @brief Time-keeping state structure.