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Old 07 January 2015, 00:32   #1
lordofchaos
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Screen tearing on small portion of display

Whilst using latest official release (WinUAE 3.0.0) I've been noticing screen tear occurring at the top (not quite the top) portion of the screen. I've tried different games but everything seems affected. The only way I can stop it from happening is switching the Graphics API from Direct3D to DirectDraw. I`m not sure how far this goes back with older versions of WinUAE, but seems fairly recent.

GeForce GTX 550 Ti
Intel(R) Core (TIM) i5-2500K @ 3.30GHz
8.00 GB RAM
Windows 7 (64bit)

My DirectX and G-Force drivers are up to date. Thought this might be the problem but appears not.
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File Type: uae A500+ STOCK.uae (21.9 KB, 46 views)

Last edited by lordofchaos; 07 January 2015 at 00:41.
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Old 07 January 2015, 09:44   #2
Toni Wilen
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Thats normal in low latency vsync + no buffer mode if buffer switch gets delayed. It is not guaranteed to work in all systems.

Also power saving features can cause it. Make sure nvidia control does not have "adaptive power saving" or any other power saving enabled.
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Old 07 January 2015, 17:28   #3
lordofchaos
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Well seems my GFX card is running at optimal settings, it's a shame this has just started to happen despite my hardware remaining the same.

After some tinkering with screen resolutions I've manage to find one that prevents the tearing. 720x576. Curious if others have experienced this though with similar hardware.
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Old 07 January 2015, 17:39   #4
Toni Wilen
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Driver update? Windows update? To get "manual" ("no buffer") buffer swap exactly right requires extremely tight timing.

WinUAE has not any recent vsync or graphics rendering changes.
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Old 07 January 2015, 17:51   #5
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Quote:
Originally Posted by Toni Wilen View Post
Driver update? Windows update? To get "manual" ("no buffer") buffer swap exactly right requires extremely tight timing.

WinUAE has not any recent vsync or graphics rendering changes.
Yup, sounds like driver/windows updates are the culprit. Maybe future updates from windows/nvidia will reverse the effect :-) Fortunately everything seems fine at 720x576.
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Old 07 January 2015, 18:38   #6
Toni Wilen
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Is it "stable" tearing (does not jump up or down more than few pixels)? If it is stable, it can be worked around by adjusting buffer swap scan line number. (Not yet possible but can be easily added)
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Old 07 January 2015, 19:13   #7
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The best I can describe is, it's limited to a narrow band located at the top part of the screen, most noticeable on smooth 8-way scrolling games.

The example picture attached shows the region where it's occurring. I can't capture it happening real-time with snapshot.
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Old 07 January 2015, 20:48   #8
Toni Wilen
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Unfortunately it is way too tall. If it was about 1/4 or 1/5 in size, there may have been possibility to hide it inside vblank.
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Old 07 January 2015, 21:14   #9
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I`ll have to take another look, the area marked in red was a rough approximation where is was but not it's size. Won't pin any hope on it being much smaller though. Thanks for looking.
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Old 16 January 2015, 16:35   #10
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I've had another look at this problem and may have found a work around. Seems if I enable double buffering along with low-latency VS the tearing goes away, even at my native 1080p.

Also I`m not noticing any extra latency as a result of using double buffering combined with of low-latency VS? Doesn't using double buffer create extra latency?
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Old 16 January 2015, 17:27   #11
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Also I`m not noticing any extra latency as a result of using double buffering combined with of low-latency VS? Doesn't using double buffer create extra latency?
I have no idea, but even if we assume it creates lag of an entire frame, that is not going to be noticable to any human.
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Old 16 January 2015, 20:43   #12
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Well seems you may be right I loaded up Pinball Dreams and had a few games, didn't notice any real tangible lag. I remember playing this before Toni implemented the low-latency VS and it was really noticeable.
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Old 17 January 2015, 10:04   #13
Toni Wilen
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One buffer = 1 frame extra latency (50Hz=20ms, 60Hz=16.6ms). Usually playability gets too bad if latency is over 2 frames, at least in pinball games.
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