06512: hyprdriv: Occasionally, when the race starting, the 3D graphic objects start to glitch and disappear, game become unplayable

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
06512	Graphics	Major	Sometimes	Feb 25, 2017, 13:52	Feb 27, 2017, 03:42

Tester	Skeleton081983	View Status	Public	Platform	MAME (Official Binary)
Assigned To	R. Belmont	Resolution	Fixed	OS	Windows 10 (64-bit)
Status [?]	Resolved			Driver	midway/seattle.cpp
Version	0.183	Fixed in Version	0.184	Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	06512: hyprdriv: Occasionally, when the race starting, the 3D graphic objects start to glitch and disappear, game become unplayable
Description	After insert coin, select track and machine, when the race starting, the 3D graphic objects start to glitch and, after some second, they completely disappear and the game become unplayable.
Steps To Reproduce	Launch game, insert coin, select track and machine.
Additional Information	This bug occurs only if "DRC" is active, if you launch the game with "-nodrc" options, that disable the "DRC", the game working correctly. Linked video of this bug:
Github Commit

Flags
Regression Version
Affected Sets / Systems	hyprdriv

Attached Files

No.13668 Haze Senior Tester Feb 26, 2017, 11:27 edited on: Feb 26, 2017, 11:29	is it a recompiler issue? ie is it still possible to break with -nodrc ? there have always been reports of some 'random' bugs in games with the DRCs enabled, not sure why, although reports seem to have increased in the last 2 releases, again, not sure why..
No.13669 Skeleton081983 Tester Feb 26, 2017, 15:26	This bug occurs only if "DRC" is active, if you launch the game with "-nodrc" options, that disable the "DRC", the game working correctly.
No.13670 R. Belmont Developer Feb 26, 2017, 19:06 edited on: Feb 26, 2017, 19:21	A regression version on this would be very important, if there is one. Seems to be an FPU bug in the MIPS DRC; the graphics do straighten themselves out after a second or two and then you can play, but it's a definite bug.
No.13673 R. Belmont Developer Feb 27, 2017, 03:42	Happy's submission here fixed this for me: https://github.com/mamedev/mame/pull/2101