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use performance counters (#947)

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Roman Fomin 2023-03-19 16:13:23 +07:00 committed by GitHub
parent fc24be131c
commit dd192165e3
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 68 additions and 42 deletions
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72
src/i_timer.c
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@ -24,49 +24,63 @@
#include "doomstat.h"
#include "m_argv.h"
static int MSToTic(Uint32 time)
static uint64_t basecounter = 0;
static uint64_t basefreq = 0;
static int MSToTic(uint32_t time)
{
return time * TICRATE / 1000;
}
static Uint32 TicToMS(int tic)
static uint64_t TicToCounter(int tic)
{
return (Uint32)tic * 1000 / TICRATE;
return (uint64_t)tic * basefreq / TICRATE;
}
static Uint32 basetime = 0;
int I_GetTimeMS(void)
{
Uint32 time;
uint64_t counter = SDL_GetPerformanceCounter();
time = SDL_GetTicks();
if (basecounter == 0)
basecounter = counter;
if (basetime == 0)
basetime = time;
return ((counter - basecounter) * 1000ull) / basefreq;
}
return time - basetime;
uint64_t I_GetTimeUS(void)
{
uint64_t counter = SDL_GetPerformanceCounter();
if (basecounter == 0)
basecounter = counter;
return ((counter - basecounter) * 1000000ull) / basefreq;
}
int time_scale = 100;
static Uint32 GetTimeMS_Scaled(void)
static uint64_t GetPerfCounter_Scaled(void)
{
Uint32 time;
uint64_t counter;
if (time_scale == 100)
{
time = SDL_GetTicks();
}
else
{
time = SDL_GetTicks() * time_scale / 100;
counter = SDL_GetPerformanceCounter() * time_scale / 100;
if (basecounter == 0)
basecounter = counter;
return counter - basecounter;
}
if (basetime == 0)
basetime = time;
static uint32_t GetTimeMS_Scaled(void)
{
uint64_t counter;
return time - basetime;
counter = SDL_GetPerformanceCounter() * time_scale / 100;
if (basecounter == 0)
basecounter = counter;
return ((counter - basecounter) * 1000ull) / basefreq;
}
int I_GetTime_RealTime(void)
@ -104,19 +118,21 @@ int (*I_GetFracTime)(void) = I_GetFracTime_Scaled;
void I_InitTimer(void)
{
basefreq = SDL_GetPerformanceFrequency();
I_GetTime = I_GetTime_Scaled;
I_GetFracTime = I_GetFracTime_Scaled;
}
void I_SetTimeScale(int scale)
{
Uint32 time;
uint64_t counter;
time = GetTimeMS_Scaled();
counter = GetPerfCounter_Scaled();
time_scale = scale;
basetime += (GetTimeMS_Scaled() - time);
basecounter += (GetPerfCounter_Scaled() - counter);
}
void I_SetFastdemoTimer(boolean on)
@ -130,11 +146,11 @@ void I_SetFastdemoTimer(boolean on)
}
else if (I_GetTime == I_GetTime_FastDemo)
{
Uint32 time;
uint64_t counter;
time = TicToMS(I_GetTime_FastDemo());
counter = TicToCounter(I_GetTime_FastDemo());
basetime += (GetTimeMS_Scaled() - time);
basecounter += (GetPerfCounter_Scaled() - counter);
I_GetTime = I_GetTime_Scaled;
I_GetFracTime = I_GetFracTime_Scaled;

4
src/i_timer.h
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@ -30,7 +30,9 @@ int I_GetTime_RealTime(void); // killough
extern int (*I_GetFracTime)(void);
// [FG] Same as I_GetTime, but returns time in milliseconds
int I_GetTimeMS();
int I_GetTimeMS(void);
uint64_t I_GetTimeUS(void);
void I_SetTimeScale(int scale);

24
src/i_video.c
View File

@ -972,18 +972,26 @@ void I_FinishUpdate(void)
{
if (fpslimit >= TICRATE)
{
static uint64_t last_frame;
uint64_t current_frame;
uint64_t target_time = 1000000ull / fpslimit;
static uint64_t start_time;
current_frame = (I_GetTimeMS() * fpslimit) / 1000;
while (current_frame == last_frame)
while (1)
{
I_Sleep(1);
current_frame = (I_GetTimeMS() * fpslimit) / 1000;
uint64_t current_time = I_GetTimeUS();
uint64_t elapsed_time = current_time - start_time;
uint64_t remaining_time = 0;
if (elapsed_time >= target_time)
{
start_time = current_time;
break;
}
last_frame = current_frame;
remaining_time = target_time - elapsed_time;
if (remaining_time > 1000)
I_Sleep((remaining_time - 1000) / 1000);
}
}
// [AM] Figure out how far into the current tic we're in as a fixed_t.