08400: blazstar: Corrupted graphics / sprite or tile scrolling glitch - Stage 1

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
08400	Graphics	Minor	Always	Aug 20, 2022, 00:31	Aug 21, 2022, 04:05

Tester	MidnightWolf	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	Bugs That Aren't Bugs	OS	Windows 10/11 (64-bit)
Status [?]	Resolved			Driver	neogeo/neogeo.cpp
Version	0.246	Fixed in Version		Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	08400: blazstar: Corrupted graphics / sprite or tile scrolling glitch - Stage 1
Description	Start of stage 1 of Blazing Star. Graphics on the far left of the screen become corrupted / graphics scrolling error at the left edge of the screen. I noticed that this bug happens as far back as MAME 0.235, but do not have older versions of MAME installed to test.
Steps To Reproduce	How to reproduce: 1. Start the game normally and select your ship. 2. As stage 1 begins, you pass a large white cloud. As this cloud scrolls off the screen to the left, the graphics become corrupted around it.
Additional Information	I have attached screenshots below to display the bug. Please pay attention to the far left of the screen as the large white cloud passes. I found evidence that the bug does not happen in the real NeoGeo arcade game: VIDEO EVIDENCE 1: SKIP TO TIME 2:55 VIDEO EVIDENCE 2: SKIP TO TIME 28:00
Github Commit

Flags
Regression Version
Affected Sets / Systems	blazstar

Attached Files	vlcsnap-2022-08-20-01h35m30s600.png (1,432,620 bytes) Aug 20, 2022, 00:39 Uploaded by MidnightWolf
Attached Files	vlcsnap-2022-08-20-01h35m45s845.png (1,483,115 bytes) Aug 20, 2022, 00:40 Uploaded by MidnightWolf

No.20476 Tafoid Administrator Aug 20, 2022, 02:42 edited on: Aug 20, 2022, 02:43	This looks a lot like known NeoGeo behavior where the left/right borders often have leftover graphics from scrolling and such. Other examples: 01656 02407 06400 If you go to Video Options -> Screen #0 and choose the Screen 0 Cropped (304x244) - you'll notice it doesn't show. Some games do use the full 320 whereas some don't (this game included). I'm inclined to believe in both instances of video above the monitor does not show the areas the emulation does and the emulation is correct.
No.20477 Fujix Administrator Aug 20, 2022, 03:06	This is a topic that has been repeated many times over the years and NOT A BUG. In the real arcade, the problematic area is cropped by the CRT monitor, if you want to eliminate it, please select 304 x 224 resolution in the video option.

No.20476

Tafoid

Administrator

Aug 20, 2022, 02:42

edited on: Aug 20, 2022, 02:43

This looks a lot like known NeoGeo behavior where the left/right borders often have leftover graphics from scrolling and such.
Other examples: 01656 02407 06400

If you go to Video Options -> Screen #0 and choose the Screen 0 Cropped (304x244) - you'll notice it doesn't show. Some games do use the full 320 whereas some don't (this game included).

I'm inclined to believe in both instances of video above the monitor does not show the areas the emulation does and the emulation is correct.

No.20477

Fujix

Administrator

Aug 20, 2022, 03:06

This is a topic that has been repeated many times over the years and NOT A BUG.
In the real arcade, the problematic area is cropped by the CRT monitor, if you want to eliminate it, please select 304 x 224 resolution in the video option.