08403: ssf2t: Graphics tearing in Cammy's stage (England)

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
08403	Graphics	Minor	Random	Aug 23, 2022, 14:49	Jul 31, 2024, 12:26

Tester	MidnightWolf	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	Open	OS	Windows 10/11 (64-bit)
Status [?]	Confirmed			Driver	capcom/cps2.cpp
Version	0.246	Fixed in Version		Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	08403: ssf2t: Graphics tearing in Cammy's stage (England)
Description	When playing on Cammy's stage (England), the graphics will randomly tear and break-up. This mostly happens on the castle wall on the far right of the screen. Usually happens when both players are jumping and the screen tries to scroll up to follow them, but it also happens at random times. It could possibly be a "sprites per line" error or scrolling error? I am just guessing though, as this graphics tearing happens randomly and for no individual reason that i could see. I have not been able to find any video footage of real arcade hardware displaying this bug so far, but will upload some if i do.
Steps To Reproduce	1. Start playing the game as normal. 2. When on Cammy's stage (England), observe the castle wall to the far right of the screen as you play. The castle wall will show random black lines and / or visible tearing at random moments while you are playing.
Additional Information
Github Commit

Flags
Regression Version
Affected Sets / Systems	ssf2t

Attached Files	0002.png (1,341,728 bytes) Aug 23, 2022, 14:49 Uploaded by MidnightWolf Screen tearing on castle wall at random moments during gameplay.

No.20481 Tafoid Administrator Aug 23, 2022, 15:09	This is already covered in another recent report, isn't it? 08393
No.20484 Tafoid Administrator Aug 23, 2022, 17:28	I checked back a few years and it still happens (0.186 is earliest I can test quickly due to romset changes) and it still happens. My gut tells me it may be related to overall driver timing and lack of wait states in the 68k CPU. Expect this to stick around for a few years more.
No.21624 Deafening_Silence Tester Jul 8, 2023, 21:22 edited on: Jul 8, 2023, 21:23	BTNB. You can see the tearing a couple of times in the round that starts at around 1:42:54 in this video. Also, I have a ST pcb and can confirm this is how the Cps2 behaves. https://m.youtube.com/watch?v=_CYXHDutBS0
No.21629 MidnightWolf Tester Jul 9, 2023, 11:06	If you own the actual PCB, could you upload video footage of your own machine instead of linking to other peoples videos on Youtube? Just to be sure.
No.21631 Deafening_Silence Tester Jul 9, 2023, 13:26	I dont have a working Supergun at the moment, Ill try to find another video. This is common Cps2 behavior, and happens in a lot of games. like SF Alpha (Adon Stage), Marvel Super Heroes (Hulk stage), Night Warriors (Pyron Stage) and Xmen vs Street Fighter (Waterfall stage).
No.21632 MidnightWolf Tester Jul 9, 2023, 13:42	Hard evidence would be better than linking to a hundred random Youtube videos. Maybe just wait until your Supergun is fixed, then you can be sure the video is legit?
No.21633 Haze Senior Tester Jul 9, 2023, 14:03 edited on: Jul 9, 2023, 14:03	Tearing is expected in arcade games. Your dismissive attitude toward somebody who has the hardware and has experienced the problems on hardware is frankly rude, especially when they can link real hardware videos that show the same thing.
No.21635 MidnightWolf Tester Jul 9, 2023, 16:17 edited on: Jul 9, 2023, 18:53	I was in no way trying to offend you or be disrespectful. You say that you own authentic PCB hardware, but refuse to upload a video to verify your claim, and instead link to random Youtube videos that may not be running on arcade hardware.... This is very strange behaviour. EDIT: I have just ran through the following games in MAME 0.256, as quoted by Deafening_Silence in his above post, and i found NO instances of the screen tearing he mentioned. (sfa) Street Fighter Alpha (Adon Stage) (msh) Marvel Super Heroes (Hulk stage) (nwarr) Night Warriors: Darkstalkers Revenge (Pyron Stage) (xmvsf) Xmen vs Street Fighter (Waterfall stage). The above games DO have sprite flicker, which is normal for CPS2 games, as he correctly states. HOWEVER, i believe the problem with Super Street Fighter II (ie: this bug i reported) is nothing to do with sprite flicker, and more likely to do with an actual timing error.
No.22245 Deafening_Silence Tester Jul 31, 2024, 12:26 edited on: Jul 31, 2024, 12:31	Ok, here is some footage of the 2024 evo matches of Super SF2 Turbo, EVO doesnt allow emulation on their tournaments, all ST tournaments there are using CPS2 hardware. You can see the supposed "bug" happening at around 1:39:15, and then again at around 1:39:30. https://m.youtube.com/watch?v=94I9JeFLBRs