Thanks for testing will! I have now added the rebuilt chain to the PR and marked it as ready for review, hopefully it will get merged soon.

This reminds me, will bgfx support multiple monitors on Macs? I've tried various options and right now it seems no dual screens at all.

I have an iMac with an external Cinema Display. Using OpenGL, it blacks out both screens and I have to toggle full screen in and out multiple times to get it to work somewhat.

It's quite a messy experience and I end up playing in windowed mode. Now with OpenGL messing up on a Retina display, it is even worse.

Fingers crossed you guys can fix it with bgfx supporting metal. Thanks!

OK I figured out something with the multiscreen games like Darius. You have to specify each monitor:

darius -bgfx_screen_chains default,default,default
[img]https://photos.app.goo.gl/kNu8ReiPt5TdPpfC6[/img]

darius -bgfx_screen_chains hlsl,hlsl,hlsl
[img]https://photos.app.goo.gl/WwgnhEjUYQpWuL1b7[/img]

So the problem is if you don't specify default or unfiltered or hlsl then it shows that screen in all red.

That should be fixed so that it defaults to default

Indeed. "default" seems like a more reasonable default than "none"

So just to recap: ./mame64 darius results in 2 out of 3 screens in all red.

In order to play darius without issue, the correct command is:

./mame64 darius -bgfx_screen_chains default,default,default

Do you have any chains configured in the ini? Even default? if yes, can you try renaming the ini so that it is not used? What *could* be happening is that if ini has default set as screen chain, it does what it says: passes -bgfx_screen_chains default to the executable. What is needed for darius is -bgfx_screen_chains default,default,default.
This would be not really a bug, but just an unfortunate consequence of the literal interpretation of the ini and the fact that the screen chain is called default.

I renamed my ini so mame is only using default settings. The second and third screen are still red.

./mame64 darius -video bgfx -bgfx_debug

[img]https://photos.app.goo.gl/6kGe4dLW1w6CiXNG8[/img]

Thanks, it was worth a shot.

Incidentally, bgfx_backend opengl is failing with any game I try.

illegal hardware instruction ./mame64 dkong -bgfx_backend opengl