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[Base] Optional raw Clock source.

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New cvar clock_source_raw allows to use the cpu cycle counter itself as an alternative time source, if system timing resolution is to low and causes problems.
This commit is contained in:
Joel Linn
2019-11-20 22:08:41 +01:00
committed by Rick Gibbed
parent f88d46cead
commit 15d422d988
5 changed files with 145 additions and 11 deletions
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14
src/xenia/base/clock.h
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@@ -15,13 +15,22 @@
#include "xenia/base/cvar.h"
DECLARE_bool(clock_no_scaling);
DECLARE_bool(clock_source_raw);
namespace xe {
class Clock {
public:
// Host ticks-per-second.
static uint64_t host_tick_frequency();
// Host ticks-per-second. Generally QueryHostTickFrequency should be used.
// Either from platform suplied time source or from hardware directly.
static uint64_t host_tick_frequency_platform();
static uint64_t host_tick_frequency_raw();
// Host tick count. Generally QueryHostTickCount() should be used.
static uint64_t host_tick_count_platform();
static uint64_t host_tick_count_raw();
// Queries the host tick frequency.
static uint64_t QueryHostTickFrequency();
// Queries the current host tick count.
static uint64_t QueryHostTickCount();
// Host time, in FILETIME format.
@@ -43,6 +52,7 @@ class Clock {
// Sets the guest time base, used for computing the system time.
// By default this is the current system time.
static void set_guest_system_time_base(uint64_t time_base);
// Queries the current guest tick count, accounting for frequency adjustment
// and scaling.
static uint64_t QueryGuestTickCount();