08747: raiden,raidena,raidenu: boss graphics stuck on screen

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
08747	Graphics	Major	Sometimes	Aug 26, 2023, 07:44	Sep 4, 2023, 06:20

Tester	ggmaximo	View Status	Public	Platform	MAME (Unofficial Binary)
Assigned To		Resolution	Open	OS	Windows 10/11 (64-bit)
Status [?]	Acknowledged			Driver	seibu/raiden.cpp
Version	0.257	Fixed in Version		Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	08747: raiden, raidena, raidenu: boss graphics stuck on screen
Description	I noticed over the years (from personal runs & replays from other players) that destroying some bosses/boss phases while bombing can cause glitches where parts of the boss graphics remain on screen indefinitely until you reset the machine. This bug apparently does not occur on the arcade PCB, looking at run footage such as SOF-WTN's run here ( timestamp 1:26:24): ?si=9Pfdv9yP1RdtHJzo&t=5182 This bug most commonly occurs on the stage 3 boss ( as it transitions to its second phase), stage 5 boss, and stage 7 boss. As far as I know, this bug was originally seen on ShmupMAME 4.2 and older versions of MAME, but it looks like it occurs on my build based on 0.239, so it may still be present in newer versions of MAME. (Edit 08/26) - Tested this on the latest official build of MAME 0.257, I was still able to reproduce the glitch on the 3rd boss with the updated screenshot)
Steps To Reproduce	1. Insert a credit and play the game until you get to the stage 3 boss with full power in Blue Laser/ ( Missile or Homing). 2. Damage the center part of the boss and then bomb as soon as the boss explodes and sends a column of bullets at you ( phase change into 2nd phase) 3. You can continue to fight & destroy the boss by killing the central part, but you can notice that parts of the boss are stuck on screen in you scroll left/right.
Additional Information
Github Commit

Flags
Regression Version
Affected Sets / Systems	raiden,raidena,raidenu

Attached Files	raidenbossglitchmame0257b.PNG (845,118 bytes) Aug 26, 2023, 18:12 Uploaded by ggmaximo

No.21710 MetalGod Senior Tester Aug 26, 2023, 08:39	You must test this on the last official mame or this report won't be accepted.
No.21711 ggmaximo Tester Aug 26, 2023, 18:14	Gotcha, I just tested this out on the latest available build of MAME (0.257b). I was still able to get the boss graphic glitch using the same steps to reproduce the bug above on the 3rd boss.
No.21723 Haze Senior Tester Sep 3, 2023, 13:55	would be interesting to see if this one happens on hardware, while a classic, some of the programming in Raiden isn't especially good.