allow MacOS OpenGL software renderer?

[jjYBdx4IL]

Seems to work by simply replacing:

ADD_ATTRIB(NSOpenGLPFAAccelerated);

with

ADD_ATTRIB(NSOpenGLPFARendererID);ADD_ATTRIB(kCGLRendererGenericFloatID);

in src/nsgl_context.m.

An automatic (optional?) fallback would be the best option.

Would be useful for debugging OpenGL apps inside a VM. Or as a fallback for incompatible hardware. For that purpose it would then also be great to have a way to check whether hardware acceleration is in use or not.

[Khrysys]

Was it throwing a specific error?

[jjYBdx4IL]

error (65545): NSGL: Failed to find a suitable pixel format

when calling initWithAttributes. After "#undef SET_ATTRIB".

[iTrooz]

I agree that this would be a great feature, I need it for the same reason (testing an app on a MacOS virtual machine)

[ikus060]

Is that something that is working today ? Is it possible to of this project in order to run openGL application on MacOS running within a VM ?

[iTrooz]

Idk on upstream, but if you check my linked PR (WerWolv/ImHex#708) we've been using it in ImHex for a while now

[HinTak]

I can answer the last question - when the software renderer is in use, glGetString(GL_RENDERER) after obtaining a valid GL context, reports itself as b'Apple Software Renderer' . On genuine Mac os desktops, we have seen b'Apple M3 Pro' and b'Apple M1' for that field (reported by some skia python users in one of our mac os x specific issues, 214) . So you can read that field to see what actual hardware/software is in use. There is probably a more convenient way.

[HinTak]

My interests in this is github's own CI testing (which is headless), and I have no apple hardware nor VM. Looking at the code, I think it is possible to add automatic fall-back? The is no simple way of doing DELETE_ATTRIB, but it seems to be possible to do a REPLACE_ATTRIB. Slight complications of replacing 1 with 2 - I guess if we are sure it was added earlier, we can everything upward by 1, then insert the two in the middle overwriting the previous one.

[HinTak]

I have added automatic software renderer retry if the accelerated request fails: #2571 - can somebody with genuine mac hardware gives it a try to check that accelerated opengl still works?