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Use high precision timer, replace I_GetTimeMicros with I_GetPreciseTime and I_PreciseToMicros

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This commit is contained in:
James R 2020-11-07 01:31:24 -08:00
parent 15b2d52c69
commit f07c6067e4
3 changed files with 24 additions and 23 deletions
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4
src/doomtype.h
View file

@ -379,4 +379,8 @@ Needed for some lua shenanigans.
#define FIELDFROM( type, field, have, want ) \
(void *)((intptr_t)(field) - offsetof (type, have) + offsetof (type, want))
#ifdef HAVE_SDL
typedef UINT64 precise_t;
#endif
#endif //__DOOMTYPE__

8
src/i_system.h
View file

@ -46,7 +46,13 @@ UINT32 I_GetFreeMem(UINT32 *total);
*/
tic_t I_GetTime(void);
int I_GetTimeMicros(void);// provides microsecond counter for render stats
/** \brief Returns precise time value for performance measurement.
*/
precise_t I_GetPreciseTime(void);
/** \brief Returns the difference between precise times as microseconds.
*/
int I_PreciseToMicros(precise_t);
/** \brief The I_Sleep function

35
src/sdl/i_system.c
View file

@ -54,8 +54,6 @@ typedef LPVOID (WINAPI *p_MapViewOfFile) (HANDLE, DWORD, DWORD, DWORD, SIZE_T);
#include <fcntl.h>
#endif
int TimeFunction(int requested_frequency);
#include <stdio.h>
#ifdef _WIN32
#include <conio.h>
@ -2045,32 +2043,23 @@ ticcmd_t *I_BaseTiccmd2(void)
// returns time in 1/TICRATE second tics
//
// millisecond precision only
int TimeFunction(int requested_frequency)
{
static Uint64 basetime = 0;
Uint64 ticks = SDL_GetTicks();
if (!basetime)
basetime = ticks;
ticks -= basetime;
ticks = (ticks*requested_frequency);
ticks = (ticks/1000);
return ticks;
}
static Uint64 timer_frequency;
static Uint64 tic_epoch;
tic_t I_GetTime(void)
{
return TimeFunction(NEWTICRATE);
const Uint64 now = SDL_GetPerformanceCounter();
return (now - tic_epoch) * NEWTICRATE / timer_frequency;
}
int I_GetTimeMicros(void)
precise_t I_GetPreciseTime(void)
{
return TimeFunction(1000000);
return SDL_GetPerformanceCounter();
}
int I_PreciseToMicros(precise_t d)
{
return d / (timer_frequency / 1000000);
}
//
@ -2078,6 +2067,8 @@ int I_GetTimeMicros(void)
//
void I_StartupTimer(void)
{
timer_frequency = SDL_GetPerformanceFrequency();
tic_epoch = SDL_GetPerformanceCounter();
}
void I_Sleep(void)