05397: mk2: Background tearing on screen fades.

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
05397	Graphics	Minor	Always	Dec 22, 2013, 11:32	May 5, 2016, 09:18

Tester	Yonah	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	Won't fix	OS	Windows Vista/7/8 (64-bit)
Status [?]	Closed			Driver	midway/midtunit.cpp
Version	0.151	Fixed in Version		Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	05397: mk2: Background tearing on screen fades.
Description	Fading transitions, often shown during attract mode, display tearing in the background, irrespective of triple buffering or waitvsync being enabled and do not show up while recording an MNG file. I used FRAPS to build a GIF animation showing the problem.
Steps To Reproduce
Additional Information
Github Commit

Flags
Regression Version
Affected Sets / Systems	mk2

Attached Files	MKII.gif (96,617 bytes) Dec 22, 2013, 11:32 Uploaded by Yonah

No.10089 B2K24 Senior Tester Dec 22, 2013, 20:03	It seems to do something similar after showing the big MK logo and right before the title screen about 50 seconds in after launching the game. It's a possibility this behavior occurs on real hardware.
No.10091 Haze Senior Tester Dec 23, 2013, 06:48 edited on: Dec 23, 2013, 06:48	sounds like the -mt issue.. turn off -mt ? / use -nomt it defaults to off now, but maybe you have old config files.
No.10095 Tafoid Administrator Dec 24, 2013, 00:55	I don't observe it happening on this end w/cheapo lcd monitor and no video syncing options selected or entered - with or without -mt attempted.
No.10096 NekoEd Senior Tester Dec 24, 2013, 01:19	Reproduces here with -mt, not with -nomt. I hardly think that disabling multithreading is the solution to this problem, however.
No.10097 B2K24 Senior Tester Dec 24, 2013, 04:44	After looking at this about 10 times with -nomt and then with -mt there are some distinctive differences I can see and the reported behavior reproduces here when running with -mt An easy way I've found to spot this behavior in quick succession is; run the game and then fast forward through 2 demo fights in attract mode. When you hit the Longest Winning Streak screen you can stop the FF. It will next show the CD and Comic book offer followed by the DCS sound system screen. Next you'll see the MK logo and this is where the reported behavior starts which extends to the next screen which is Midway Presents. running -mt and -nomt both show the FPS always at 100% and oddly enough, if I run -mt and enable my HLSL then the reported behavior does not happen.
No.10098 Haze Senior Tester Dec 24, 2013, 10:45 edited on: Dec 24, 2013, 10:46	as previously discussed, -mt is inherently unsafe, and ends up updating the screen with badly synced palette / video data, that's why it was turned off by default. this should be linked to the other -mt bug report. in reality it will affect every game using indexed palettes (as long as they change the colours rather than using a static palette) it's most noticeable on fades tho.
No.12605 Osso Moderator May 5, 2016, 09:18	-mt functionality has been removed.