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[OpenTK] Do not hang when update rate too high

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OpenTK will now detect when an UpdateFrame handler is consistently
taking too long to finish, and stop raising UpdateFrame events. This
gives ProcessEvents() a chance to execute and will protect the
application from hanging up.
This commit is contained in:
Stefanos A. 2014-01-14 13:55:24 +01:00
parent 95d71bc0cc
commit 1f44cf27a1
1 changed files with 11 additions and 0 deletions
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11
Source/OpenTK/GameWindow.cs
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@ -92,6 +92,8 @@ namespace OpenTK
double update_epsilon; // quantization error for UpdateFrame events
bool is_running_slowly; // true, when UpdatePeriod cannot reach TargetUpdatePeriod
VSyncMode vsync;
FrameEventArgs update_args = new FrameEventArgs();
@ -440,6 +442,7 @@ namespace OpenTK
void DispatchUpdateAndRenderFrame(object sender, EventArgs e)
{
int is_running_slowly_retries = 4;
double timestamp = watch.Elapsed.TotalSeconds;
double elapsed = 0;
@ -464,6 +467,14 @@ namespace OpenTK
// per ProcessEvents() call)
break;
}
is_running_slowly = update_epsilon >= TargetUpdatePeriod;
if (is_running_slowly && --is_running_slowly_retries == 0)
{
// If UpdateFrame consistently takes longer than TargetUpdateFrame
// stop raising events to avoid hanging inside the UpdateFrame loop.
break;
}
}
elapsed = ClampElapsed(timestamp - render_timestamp);