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add delay during drawing to step down, targeting 40-60 FPS

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This commit is contained in:
Jorj Bauer 2017-02-27 09:35:49 -05:00
parent 691b2de8bb
commit 2060f366e5
1 changed files with 21 additions and 8 deletions
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29
sdl/aiie.cpp
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@ -232,6 +232,7 @@ int main(int argc, char *argv[])
}
while (1) {
static uint32_t usleepcycles = 16384; // step-down for display drawing. FIXME: this constant works well for *my* machine. Dynamically generate?
static uint32_t ctr = 0;
if (++ctr == 0) {
printf("hit: %llu; miss: %llu; pct: %f\n", hitcount, misscount, (double)misscount / (double)(misscount + hitcount));
@ -254,20 +255,32 @@ int main(int argc, char *argv[])
g_keyboard->maintainKeyboard();
g_display->drawBatteryStatus(100);
#ifdef SHOWFPS
// calculate FPS & dynamically step up/down as necessary
static time_t startAt = time(NULL);
static uint32_t loopCount = 0;
loopCount++;
time_t lenSecs = time(NULL) - startAt;
if (lenSecs >= 10) {
uint32_t lenSecs = time(NULL) - startAt;
if (lenSecs >= 5) {
float fps = loopCount / lenSecs;
#ifdef SHOWFPS
char buf[25];
sprintf(buf, "%lu FPS", loopCount / lenSecs);
sprintf(buf, "%f FPS", fps);
g_display->debugMsg(buf);
startAt = time(NULL);
loopCount = 0;
}
#endif
if (fps > 60) {
usleepcycles *= 2;
} else if (fps < 40) {
usleepcycles /= 2;
}
// reset the counter & we'll adjust again in 5 seconds
loopCount = 0;
startAt = time(NULL);
}
if (usleepcycles >= 2) {
usleep(usleepcycles);
}
#ifdef SHOWPC
{
char buf[25];