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desmume
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Added FPS limiter. Only for the gtk ui at the moment.

This commit is contained in:
evilynux 2007-02-18 07:05:44 +00:00
parent 2e7ea2767e
commit a297f65bdb
1 changed files with 52 additions and 2 deletions
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54
desmume/src/gtk/main.c
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@ -26,6 +26,9 @@
#define EMULOOP_PRIO (G_PRIORITY_HIGH_IDLE + 20)
#define FPS_LIMITER_FRAME_PERIOD 20
static SDL_sem *fps_limiter_semaphore;
/************************ CONFIG FILE *****************************/
// extern char FirmwareFile[256];
@ -886,7 +889,7 @@ gboolean EmuLoop(gpointer data)
if(desmume_running()) /* Si on est en train d'executer le programme ... */
{
static int limiter_frame_counter = 0;
fps_FrameCount += Frameskip + 1;
if(!fps_SecStart) fps_SecStart = SDL_GetTicks();
if(SDL_GetTicks() - fps_SecStart >= 1000)
@ -907,6 +910,15 @@ gboolean EmuLoop(gpointer data)
_updateDTools();
gtk_widget_queue_draw(pDrawingArea);
limiter_frame_counter += 1;
if ( limiter_frame_counter >= FPS_LIMITER_FRAME_PERIOD) {
limiter_frame_counter = 0;
/* wait for the timer to expire */
SDL_SemWait( fps_limiter_semaphore);
}
return TRUE;
}
@ -916,6 +928,27 @@ gboolean EmuLoop(gpointer data)
}
/**
* A SDL timer callback function. Signals the supplied SDL semaphore
* if its value is small.
*
* @param interval The interval since the last call (in ms)
* @param param The pointer to the semaphore.
*
* @return The interval to the next call (required by SDL)
*/
static u32 fps_limiter_fn(u32 interval, void *param) {
SDL_sem *sdl_semaphore = (SDL_sem *)param;
/* signal the semaphore if it is getting low */
if ( SDL_SemValue( sdl_semaphore) < 4) {
SDL_SemPost( sdl_semaphore);
}
return interval;
}
/////////////////////////////// MAIN ///////////////////////////////
#ifdef WIN32
@ -932,6 +965,7 @@ static void dui_set_accel_group(gpointer action, gpointer group) {
int main (int argc, char *argv[])
{
int i;
SDL_TimerID limiter_timer;
const char *commandLine_File = NULL;
GtkWidget *pVBox;
@ -947,7 +981,7 @@ int main (int argc, char *argv[])
#endif
gtk_init(&argc, &argv);
if(SDL_Init(SDL_INIT_VIDEO) == -1)
if(SDL_Init(SDL_INIT_TIMER) == -1)
{
fprintf(stderr, "Error trying to initialize SDL: %s\n",
SDL_GetError());
@ -1182,6 +1216,18 @@ int main (int argc, char *argv[])
gtk_widget_show_all(pWindow);
//LoadFirmware("fw.bin");
/* create the semaphore used for fps limiting */
fps_limiter_semaphore = SDL_CreateSemaphore( 1);
/* start a SDL timer for every FPS_LIMITER_FRAME_PERIOD frames to keep us at 60 fps */
limiter_timer = SDL_AddTimer( 16 * FPS_LIMITER_FRAME_PERIOD, fps_limiter_fn, fps_limiter_semaphore);
if ( limiter_timer == NULL) {
fprintf( stderr, "Error trying to start FPS limiter timer: %s\n",
SDL_GetError());
return 1;
}
/* Vérifie la ligne de commandes */
if(commandLine_File)
@ -1211,6 +1257,10 @@ int main (int argc, char *argv[])
desmume_free();
/* tidy up the FPS limiter timer and semaphore */
SDL_RemoveTimer( limiter_timer);
SDL_DestroySemaphore( fps_limiter_semaphore);
#ifdef DEBUG
LogStop();
#endif