07000: tinstar: Tinstar - Tripping over invisible barrel?

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
07000	Gameplay	Major	Always	Jun 4, 2018, 13:08	Jun 10, 2021, 11:19

Tester	rcoltrane	View Status	Public	Platform	MAME (Official Binary)
Assigned To	galibert	Resolution	Fixed	OS	Windows 10 (64-bit)
Status [?]	Resolved			Driver	taito/taitosj.cpp
Version	0.198	Fixed in Version	0.233	Build	64-bit
		Fixed in Git Commit	7d65e37	Github Pull Request #

Summary	07000: tinstar: Tinstar - Tripping over invisible barrel?
Description	When you start a new game and go straight to the bottom right side of the screen, the character lays on the floor and you cannot get up until after some time or a bullet hits you. Seems to happen only with the 1st life, after you lose a life, the problem disappears. EDIT: changed the severity to Major because the gameplay is severely impacted by this bug.
Steps To Reproduce	Start a new game and go straight to the bottom right side of the screen. When you reach that position, the character will lay down on the floor.
Additional Information
Github Commit

Flags
Regression Version	0.123u2
Affected Sets / Systems	tinstar

Attached Files

No.15089 Tafoid Administrator Jun 4, 2018, 18:00	Surely could use some actual PCB reference. It seems to me like your character is stumbling over a barrel that is not visible. If you avoid that corner for a time during the game and let a barrel roll through on screen, you are no longer tripped up going to the right side corner.
No.18229 MetalGod Senior Tester Dec 7, 2020, 23:48	I've just found out this bug has a regression version. Regression is 0.123u2 - 0.123u2: Zsolt Vasvari simplified collision detection in Taito SJ driver. Removing "possible" flag.
No.18230 Osso Moderator Dec 8, 2020, 15:45	If that's the regression version, the specific commit is probably: https://git.redump.net/mame/commit/?id=5b35164ee0cc534a1354df327b8190e9d2738bd3
No.18232 rcoltrane Tester Dec 9, 2020, 16:16 edited on: Dec 9, 2020, 16:18	Confirmed the regression version pointed by OSSO. In version 0.122, both gameplay and the sound when inserting a coin are perfect! I really don't understand why Zsolt Vasvary did that 'major driver cleanup' in MAME version 0.123, which clearly made things worse. After doing these tests I strongly suggest that we revert this driver back to the 0.122 one.
No.18235 Tafoid Administrator Dec 9, 2020, 19:06	Wholesale "reverting" a driver is not the answer. MAME's sourcecode has changed significantly since 0.122 (13 years ago) and as such this cannot be done. Someone who is capable will need to see what the old vs new code did to make the emulation behave differently and implement that in the current codebase.
No.18945 Robbbert Senior Tester Jun 8, 2021, 02:17	Does this fix it? https://github.com/mamedev/mame/commit/7d65e376f053d3a25ccc06e1d52cccc68ff207d5
No.18961 rcoltrane Tester Jun 10, 2021, 11:19 edited on: Jun 10, 2021, 11:19	I will do some more tests on it when the next official MAME version is released.