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Fall back on precise syncing

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This commit is contained in:
Boulay Mathias 2022-05-31 23:52:01 +02:00
parent ea3c1ac903
commit c1212c7039
1 changed files with 38 additions and 21 deletions
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59
jre_lwjgl3glfw/src/main/java/org/lwjgl/opengl/Sync.java
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@ -72,6 +72,11 @@ class Sync {
if (fps <= 0) if (fps <= 0)
return; return;
preciseSync(fps);
}
/** Fast, more cpu friendly way of syncing, although can be off the mark at times */
private static void fastSync(int fps){
if (!initialised){ if (!initialised){
initialised = true; initialised = true;
lastFrameTime = getTime(); lastFrameTime = getTime();
@ -96,6 +101,39 @@ class Sync {
lastFrameTime = getTime(); lastFrameTime = getTime();
} }
/** Precise, more cpu intensive way of syncing */
private static void preciseSync(int fps){
if (!initialised)
initialise();
try {
// sleep until the average sleep time is greater than the time
// remaining till nextFrame
for (long t0 = getTime(), t1; (nextFrame - t0) > sleepDurations.avg(); t0 = t1) {
Thread.sleep(1);
sleepDurations.add((t1 = getTime()) - t0); // update average
// sleep time
}
// slowly dampen sleep average if too high to avoid yielding too
// much
sleepDurations.dampenForLowResTicker();
// yield until the average yield time is greater than the time
// remaining till nextFrame
for (long t0 = getTime(), t1; (nextFrame - t0) > yieldDurations.avg(); t0 = t1) {
Thread.yield();
yieldDurations.add((t1 = getTime()) - t0); // update average
// yield time
}
} catch (InterruptedException e) {
}
// schedule next frame, drop frame(s) if already too late for next frame
nextFrame = Math.max(nextFrame + NANOS_IN_SECOND / fps, getTime());
}
/** /**
* This method will initialise the sync method by setting initial values for * This method will initialise the sync method by setting initial values for
* sleepDurations/yieldDurations and nextFrame. * sleepDurations/yieldDurations and nextFrame.
@ -109,27 +147,6 @@ class Sync {
yieldDurations.init((int) (-(getTime() - getTime()) * 1.333)); yieldDurations.init((int) (-(getTime() - getTime()) * 1.333));
nextFrame = getTime(); nextFrame = getTime();
String osName = System.getProperty("os.name");
if (osName.startsWith("Win")) {
// On windows the sleep functions can be highly inaccurate by
// over 10ms making in unusable. However it can be forced to
// be a bit more accurate by running a separate sleeping daemon
// thread.
Thread timerAccuracyThread = new Thread(new Runnable() {
public void run() {
try {
Thread.sleep(Long.MAX_VALUE);
} catch (Exception e) {
}
}
});
timerAccuracyThread.setName("LWJGL Timer");
timerAccuracyThread.setDaemon(true);
timerAccuracyThread.start();
}
} }
/** /**