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- Ported frame rate limiting code to SDL.

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SVN r3891 (trunk)
This commit is contained in:
Braden Obrzut 2012-10-17 19:45:04 +00:00
commit 1907983ab7
4 changed files with 116 additions and 30 deletions
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83
src/sdl/hardware.cpp
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@ -33,6 +33,8 @@
*/
#include <SDL.h>
#include <signal.h>
#include <time.h>
#include "hardware.h"
#include "i_video.h"
@ -175,10 +177,89 @@ void I_ClosestResolution (int *width, int *height, int bits)
return;
}
}
}
}
//==========================================================================
//
// SetFPSLimit
//
// Initializes an event timer to fire at a rate of <limit>/sec. The video
// update will wait for this timer to trigger before updating.
//
// Pass 0 as the limit for unlimited.
// Pass a negative value for the limit to use the value of vid_maxfps.
//
//==========================================================================
EXTERN_CVAR(Int, vid_maxfps);
EXTERN_CVAR(Bool, cl_capfps);
Semaphore FPSLimitSemaphore;
static void FPSLimitNotify(sigval val)
{
SEMAPHORE_SIGNAL(FPSLimitSemaphore)
}
void I_SetFPSLimit(int limit)
{
static sigevent FPSLimitEvent;
static timer_t FPSLimitTimer;
static bool FPSLimitTimerEnabled = false;
static bool EventSetup = false;
if(!EventSetup)
{
EventSetup = true;
FPSLimitEvent.sigev_notify = SIGEV_THREAD;
FPSLimitEvent.sigev_signo = 0;
FPSLimitEvent.sigev_value.sival_int = 0;
FPSLimitEvent.sigev_notify_function = FPSLimitNotify;
FPSLimitEvent.sigev_notify_attributes = NULL;
SEMAPHORE_INIT(FPSLimitSemaphore, 0, 0)
}
if (limit < 0)
{
limit = vid_maxfps;
}
// Kill any leftover timer.
if (FPSLimitTimerEnabled)
{
timer_delete(FPSLimitTimer);
FPSLimitTimerEnabled = false;
}
if (limit == 0)
{ // no limit
DPrintf("FPS timer disabled\n");
}
else
{
FPSLimitTimerEnabled = true;
if(timer_create(CLOCK_REALTIME, &FPSLimitEvent, &FPSLimitTimer) == -1)
Printf("Failed to create FPS limitter event\n");
itimerspec period = { {0, 0}, {0, 0} };
period.it_value.tv_nsec = period.it_interval.tv_nsec = 1000000000 / limit;
if(timer_settime(FPSLimitTimer, 0, &period, NULL) == -1)
Printf("Failed to set FPS limitter timer\n");
DPrintf("FPS timer set to %u ms\n", (unsigned int) period.it_interval.tv_nsec / 1000000);
}
}
CUSTOM_CVAR (Int, vid_maxfps, 200, CVAR_ARCHIVE | CVAR_GLOBALCONFIG)
{
if (vid_maxfps < TICRATE && vid_maxfps != 0)
{
vid_maxfps = TICRATE;
}
else if (vid_maxfps > 1000)
{
vid_maxfps = 1000;
}
else if (cl_capfps == 0)
{
I_SetFPSLimit(vid_maxfps);
}
}
extern int NewWidth, NewHeight, NewBits, DisplayBits;