Can it use native OpenGL 2.1 for raspberry pi instead of GL4ES?

[sosssego]

Is it possible to use Raspberry Pi version of OpenGL 2.1 instead of GL4ES?

Also I would like to understand how it works, any suggestion on what to read?
How it translate for example DirectX calls to OpenGL?

Thanks
ps. Great work!

[ptitSeb]

Is it possible to use Raspberry Pi version of OpenGL 2.1 instead of GL4ES?

Yes of course. Box86 will use whatever libGL.so.1 it find first. On a Pi4, just don't put GL4ES to use default GL (so mesa)

Also I would like to understand how it works, any suggestion on what to read?

Here is an old article about box86: https://www.giantpockets.com/box86-run-x86-code-and-games-on-arm/ It's a bit old, so the Dynarec didn't exist at that time. But the principle of box86 are explained. Just not the dynarec.
Also I write a blog, so you can have some more technical info from time to time; https://box86.org/index.php/2021/06/27/game-performances/

How it translate for example DirectX calls to OpenGL?

That's Wine working there, not box86 directly. Box86 allow x86 version of Wine to run (translating x86 binaries to ARM). And Wine is doing all the Windows to Linux translation.

Thanks
ps. Great work!

Thanks :)

[sosssego]

Thanks for your answer, I read the 2 links they are good.
I still did not understand all of it, I think I need to study the .elf part
I did not get how you check that the one program is calling a function, but I think I should try replicate the system call example in your link. It may be I good idea put links to the commits in the article.

Regards

[ptitSeb]

Function call are indeed resolved durring the elf loading. You can use readelf -aW /PATH/TO/SOME/ELF | less to have some detailled informations on what an elf file needs...