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start skipping frames when we are too slow

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This commit is contained in:
Tim Felgentreff 2022-06-28 21:38:30 +02:00
parent 104d89de91
commit afc5d8765b
1 changed files with 26 additions and 0 deletions
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26
src/video/sdl.cpp
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@ -719,6 +719,8 @@ const EventCallback *GetCallbacks()
return Callbacks;
}
static int SkipFrameMask = 0;
/**
** Wait for interactive input event for one frame.
**
@ -738,6 +740,27 @@ void WaitEventsOneFrame()
Uint32 ticks = SDL_GetTicks();
if (ticks > NextFrameTicks) { // We are too slow :(
++SlowFrameCounter;
if (SlowFrameCounter > FRAMES_PER_SECOND) {
unsigned long pct = (SlowFrameCounter * 100) / (FrameCounter ? FrameCounter : 1);
bool warn = false;
if (pct >= 40) {
warn = (SkipFrameMask > 0b1);
SkipFrameMask = 0b1;
} else if (pct >= 20) {
warn = (SkipFrameMask > 0b11);
SkipFrameMask = 0b11;
} else if (pct >= 10) {
warn = (SkipFrameMask == 0);
SkipFrameMask = 0b111;
}
if (warn) {
fprintf(stdout, "WARNING WARNING WARNING\n"
"Frames %lu, Slow frames %d = %lu%%, starting to skip every %d%s frame.\n",
FrameCounter, SlowFrameCounter, pct, SkipFrameMask + 1, SkipFrameMask == 1 ? "nd" : "th");
fflush(stdout);
SlowFrameCounter = 0;
}
}
}
InputMouseTimeout(*GetCallbacks(), ticks);
@ -803,6 +826,9 @@ void RealizeVideoMemory()
if (dummyRenderer) {
return;
}
if (SkipFrameMask && (FrameCounter & SkipFrameMask) == SkipFrameMask) {
return;
}
if (NumRects) {
//SDL_UpdateWindowSurfaceRects(TheWindow, Rects, NumRects);
SDL_UpdateTexture(TheTexture, NULL, TheScreen->pixels, TheScreen->pitch);