valter/dosbox-staging
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Introduce a random sleep period, which activates after 3 short sleeps in one frame.

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@4039
This commit is contained in:
Peter Veenstra 2017-09-02 09:49:19 +00:00
parent 33da572d9e
commit 8d5d05846b
1 changed files with 31 additions and 2 deletions
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33
src/dosbox.cpp
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@ -154,6 +154,9 @@ static Bitu Normal_Loop(void) {
}
}
//For trying other delays
#define wrap_delay(a) SDL_Delay(a)
void increaseticks() { //Make it return ticksRemain and set it in the function above to remove the global variable.
if (GCC_UNLIKELY(ticksLocked)) { // For Fast Forward Mode
ticksRemain=5;
@ -164,14 +167,36 @@ void increaseticks() { //Make it return ticksRemain and set it in the function a
ticksScheduled = 0;
return;
}
static Bit32s lastsleepDone = -1;
static Bitu sleep1count = 0;
Bit32u ticksNew;
ticksNew = GetTicks();
ticksScheduled += ticksAdded;
if (ticksNew <= ticksLast) { //lower should not be possible, only equal.
ticksAdded = 0;
SDL_Delay(1);
ticksDone -= GetTicks() - ticksNew;
if (!CPU_CycleAutoAdjust || CPU_SkipCycleAutoAdjust || sleep1count < 3) {
wrap_delay(1);
} else {
/* Certain configurations always give an exact sleepingtime of 1, this causes problems due to the fact that
dosbox keeps track of full blocks.
This code introduces some randomness to the time slept, which improves stability on those configurations
*/
static const Bit32u sleeppattern[] = { 2, 2, 3, 2, 2, 4, 2};
static Bit32u sleepindex = 0;
if (ticksDone != lastsleepDone) sleepindex = 0;
wrap_delay(sleeppattern[sleepindex++]);
sleepindex %= sizeof(sleeppattern) / sizeof(sleeppattern[0]);
}
Bit32s timeslept = GetTicks() - ticksNew;
// Count how many times in the current block (of 250 ms) the time slept was 1 ms
if (CPU_CycleAutoAdjust && !CPU_SkipCycleAutoAdjust && timeslept == 1) sleep1count++;
lastsleepDone = ticksDone;
// Update ticksDone with the time spent sleeping
ticksDone -= timeslept;
if (ticksDone < 0)
ticksDone = 0;
return; //0
@ -249,9 +274,13 @@ void increaseticks() { //Make it return ticksRemain and set it in the function a
}
}
}
//Reset cycleguessing parameters.
CPU_IODelayRemoved = 0;
ticksDone = 0;
ticksScheduled = 0;
lastsleepDone = -1;
sleep1count = 0;
} else if (ticksAdded > 15) {
/* ticksAdded > 15 but ticksScheduled < 5, lower the cycles
but do not reset the scheduled/done ticks to take them into