04665: tgmj: Palette corruption

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
04665	Color/Palette	Minor	Always	Feb 7, 2012, 23:41	Feb 7, 2025, 21:36

Tester	muf	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	Open	OS
Status [?]	Confirmed			Driver	sony/zn.cpp
Version	0.145	Fixed in Version		Build
		Fixed in Git Commit		Github Pull Request #

Summary	04665: tgmj: Palette corruption
Description	Bright palette indices in one of the attract mode backgrounds are incorrect. See PCB capture screenshot of how it should be.
Steps To Reproduce
Additional Information	The PCB capture colours are slightly oversaturated; this is unrelated to MAME. Also, I didn't capture the exact same frame (in my PCB capture, the tetromino was just locking, in the MAME screenshot the tetromino has locked) -- also unrelated to the issue.
Github Commit

Flags	Verified with Original
Regression Version
Affected Sets / Systems	tgmj

Attached Files	tgm_palette_mame.png (47,642 bytes) Feb 7, 2012, 23:41 Uploaded by muf
Attached Files	tgm_palette_pcb.png (131,192 bytes) Feb 7, 2012, 23:41 Uploaded by muf

No.22960 JimCarlTay Tester Feb 7, 2025, 16:52 edited on: Feb 7, 2025, 16:55	Seems like one of the files in this ROM set may need a redump. Most especially because I can see that the lighting on the background does not render correctly.
No.22964 hap Developer Feb 7, 2025, 17:55	Before anyone gets the idea marking roms as bad, I really doubt it's a ROM dump issue.
No.22965 JimCarlTay Tester Feb 7, 2025, 17:57 edited on: Feb 7, 2025, 18:05	So the incorrect background rendering is because of inaccuracies in emulating the PSX GPU, isn't it? It looks more like a graphics issue to me than a color issue.
No.22968 Haze Senior Tester Feb 7, 2025, 21:36 edited on: Feb 7, 2025, 21:39	it is a little odd that the rest of the rendering on lower lines / to the right of the effect seems to be getting shifted around, even not in the affected area, although the glitches I see running it myself don't quite match the screenshots? PSX rendering does have plenty of inaccuracies though.