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Avoid a fast-forward effect when not drawing.

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This fixes loading screens and such, which drop the fps down to 0 or 6
according to our measure, which can distort audio if we've got free time.

If the system is not keeping up, should have the same behavior as before.
This commit is contained in:
Unknown W. Brackets 2014-06-26 00:37:03 -07:00
parent 23dc69fc9b
commit 8172e838a5
1 changed files with 35 additions and 0 deletions
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35
Core/HLE/sceDisplay.cpp
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@ -556,6 +556,38 @@ void DoFrameTiming(bool &throttle, bool &skipFrame, float timestep) {
lastFrameTime = nextFrameTime;
}
void DoFrameIdleTiming() {
if (!FrameTimingThrottled() || wasPaused) {
return;
}
time_update();
double dist = time_now_d() - lastFrameTime;
// Ignore if the distance is just crazy. May mean wrap or pause.
if (dist < 0.0 || dist >= 15 * timePerVblank) {
return;
}
float scaledVblank = timePerVblank;
if (PSP_CoreParameter().fpsLimit == FPS_LIMIT_CUSTOM) {
// 0 is handled in FrameTimingThrottled().
scaledVblank *= 60.0f / g_Config.iFpsLimit;
}
// If we have over at least a vblank of spare time, maintain at least 30fps in delay.
// This prevents fast forward during loading screens.
const double thresh = lastFrameTime + (numVBlanksSinceFlip - 1) * scaledVblank;
if (numVBlanksSinceFlip >= 2 && time_now_d() < thresh) {
// Give a little extra wiggle room in case the next vblank does more work.
const double goal = lastFrameTime + numVBlanksSinceFlip * scaledVblank - 0.001;
while (time_now_d() < goal) {
sleep_ms(1);
time_update();
}
}
}
void hleEnterVblank(u64 userdata, int cyclesLate) {
int vbCount = userdata;
@ -650,6 +682,9 @@ void hleEnterVblank(u64 userdata, int cyclesLate) {
// place to do housekeeping.
CoreTiming::ScheduleEvent(0 - cyclesLate, afterFlipEvent, 0);
numVBlanksSinceFlip = 0;
} else {
// Okay, there's no new frame to draw. But audio may be playing, so we need to time still.
DoFrameIdleTiming();
}
}