OpenGL 2 with libmpv: how to make it work?

[barracuda156]

A lot of apps depend on mpv, and some use specifically libmpv. I maintain a port for macOS powerpc, which uses SDL2 backend, where GL works (and macOS < 10.7 supports only GL < 3). However, GL is broken in libmpv, which, for example, makes it impossible to use implay at all and wiliwili with [some] hardware acceleration. celluloid also uses libmpv, and perhaps other apps. It will be really helpful to fix OpenGL 2 support properly in mpv. I understand that upstream is not interested to have it, so this is not a feature request, but a query: I am not a GL expert, and from commit history it seems to me that GL2 support was broken ages ago when the codebase was very different. So I cannot just restore the working code, and it is not a matter of rebasing, unfortunately.

[na-na-hi]

Works for me with the SDL example on Linux. OpenGL 2 is supported on vo=gpu and libmpv GL render API.

Post log.

[barracuda156]

@na-na-hi Interesting. And in this case SDL is not used for GL? (I ask since via SDL it works for me, but not otherwise.)

implay hits this error: https://github.com/tsl0922/ImPlay/blob/204ebdba6f74fb38238019b002a7a99f0a3ddfce/source/mpv.cpp#L108-L109

And pretty much the same error with wiliwili: xfangfang/wiliwili#570 (comment)

Am I doing something wrong? I am not sure how I can pass arguments to libmpv when it is used from a third-part app.

[na-na-hi]

GL2.1 is required but it does not work on your GPU. You need to either remove all parts that assume GL2.1 minimum in the code or upgrade GPU to something in the next generation like 7800 GT.

[barracuda156]

@na-na-hi 7800 GT supports newer GL than 4500 Quadro FX? I am surprised, but can’t verify presently, since out of three top GPUs for PowerMacs 7800 GT is that one which I do not have. (Also GL is proprietary in macOS, and parity with x86 is not guaranteed for the same hardware – in case you rely on published specs.)
That aside, most of IRL powerpc Apple hardware won’t have an option to install 7800 GT, so it still makes sense to make it work for regular machines.

[barracuda156]

Just realized that on the current PowerMac I got 6600, while 4500 is in the Quad, which has issues recently, so I am on this machine. That explains.