06476: all: bgfx - metal crashes since 0.177 in every version

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
06476	Graphics	Major	Always	Jan 26, 2017, 20:07	Jan 27, 2017, 10:57

Tester	estefan3112	View Status	Public	Platform	MAME (Self-compiled)
Assigned To		Resolution	Not fixable	OS	MacOS X
Status [?]	Closed			Driver	konami/gyruss.cpp
Version	0.182	Fixed in Version		Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	06476: all: bgfx - metal crashes since 0.177 in every version
Description	Since version 0.177 of MAME, bgfx-metal crashes/does not work. I could reproduce this both in El Capitan (0.177 - 0.179, and these systems also crash in MacOS Sierra), since 0.180 in MacOS Sierra. In younger versions, MAME does not crash, but produces no picture. Latest error message under 0.182 after exiting the system: CoreAnimation: warning, deleted thread with uncommitted CATransaction; set CA_DEBUG_TRANSACTIONS=1 in environment to log backtraces. Same happens with the officially compiled version of SDLMAME. MAME 0.176 still works in my current environment. PS: I could not report earlier because I have real troubles with logging in in MAME Testers if I am using the MacOSX Password Manager -> I get immediately kicked out again.
Steps To Reproduce	./mame64 -video bgfx -str 60 -noafs -bgfx_screen_chains crt-geom-deluxe -bgfx_backend metal -artcrop -noreadconfig -nosleep -nothrottle gyruss (any game)
Additional Information	See also my blog re running MAME on Macs: https://mameonmacs.blogspot.co.at/2016/09/mame-0177-first-impressions.html Crash has been confirme by one visitor of my blog. As indicated by Tafoid below, the command works under Windows, however, since Metal is an Apple API requiring El Capitan or newer, my assumption is that 'metal' is ignored in the MAME Windows version.
Github Commit

Flags	SDL specific
Regression Version	0.177
Affected Sets / Systems	all

Attached Files

No.13559 Tafoid Administrator Jan 26, 2017, 21:04	At least for Windows, your command lines seems to work (had to take out -noreadconfig which had my path settings). I'm able to see and hear Gyruss without issue. Hopefully someone else on MAC OSX can test.
No.13561 estefan3112 Tester Jan 26, 2017, 21:40 edited on: Jan 26, 2017, 21:41	I have added this in my report: Metal is an Apple API requiring El Capitan or higher, so my assumption is that the MAME Windows version just ignores 'bgfx_backend metal'.
No.13562 Tafoid Administrator Jan 27, 2017, 10:55 edited on: Jan 27, 2017, 10:58	From what I was told from our current project leader, the metal backend support is preliminary through BGFX and was never fully supported. The BGFX project, https://github.com/bkaradzic/bgfx , is entirely responsible for it working or not and the fact that it works for one platform and not another is a matter of luck. You may be able to address your issues directly with them as it falls beyond the scope of our bug coverage. It is suggested to use OpenGL 3. Again, this is nothing we can address or fix on our end. Closing this report.