04044: batsugun and clones: [possible] batsugun VDP mixing still not correct

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
04044	Graphics	Minor	Always	Sep 4, 2010, 03:13	Sep 7, 2010, 10:27

Tester	AWJ	View Status	Public	Platform	SDLMAME
Assigned To	Haze	Resolution	Fixed	OS	Linux
Status [?]	Resolved			Driver	toaplan/toaplan2.cpp
Version	0.139u2	Fixed in Version	0.139u3	Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	04044: batsugun and clones: [possible] batsugun VDP mixing still not correct
Description	The attached screenshot is the screen shown at the end of a level that tallies up your bonus points for medals (the large and small spinning gold chevrons left by destroyed enemies) At least if the Saturn version is something to go by, there should be medal sprites to the left of the two equals signs, one small and one large.
Steps To Reproduce
Additional Information
Github Commit

Flags	Possible
Regression Version
Affected Sets / Systems	batsugun and clones

Attached Files	0000.png (30,215 bytes) Sep 4, 2010, 03:13

No.06676 Haze Senior Tester Sep 4, 2010, 03:16	agreed, it's not a vdp<->vdp mixing issue with this one tho, it actually seems to indicate there is an issue with the mixing of each individual VDP (which I did think was correct, but this could be a good edge case) Probably an 'equal priority' problem. They're sprites, but they're obscured by the tilemap output from that VDP.
No.06677 Haze Senior Tester Sep 4, 2010, 03:44 edited on: Sep 4, 2010, 03:45	if you shift the sprite priority table one place ie static const UINT8 gp9001_sprprimap1[16] = { 0x04, 0x08, 0x0c, 0x10, 0x14, 0x18, 0x1c, 0x20, 0x24, 0x28, 0x2c, 0x30, 0x34, 0x38, 0x3c, 0x40 }; then that screen works.. seems to require that sprites render above the tiles which have a priority of 1 higher... will need testing tho, it's definitely a single vdp mixing issue tho, rather than a dual one. edit that does nasty things to a few screens in Batrider, so isn't a proper fix.
No.06679 Haze Senior Tester Sep 4, 2010, 04:15	btw if anybody notice any other mixing (priority / hidden objects) bugs with the single VDP games then let me know, they might act as useful test cases, the driver used to contain a lot of hacks but no indication of what they were for.
No.06697 Haze Senior Tester Sep 7, 2010, 10:27	this will be especially true after u3. I've fixed this bug the only way I could reasonably see how, however that meant ignoring what was thought to be one of the priority bits. actual hardware references will always help of course..