<div dir="ltr">Thank you very much, Pekka.<div> </div></div> <div class="gmail_quote"><div dir="ltr" class="gmail_attr">Em ter., 30 de abr. de 2024 às 11:39, Pekka Paalanen <<a href="mailto:pekka.paalanen@haloniitty.fi">pekka.paalanen@haloniitty.fi</a>> escreveu: </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">On Tue, 30 Apr 2024 09:58:32 -0300 Thiago Milczarek Sayão <<a href="mailto:thiago.sayao@gmail.com" target="_blank">thiago.sayao@gmail.com</a>> wrote: > Hi, > > I'm looking the docs at > <a href="https://registry.khronos.org/EGL/sdk/docs/man/html/eglGetDisplay.xhtml" rel="noreferrer" target="_blank">https://registry.khronos.org/EGL/sdk/docs/man/html/eglGetDisplay.xhtml</a> > > But I'm still in doubt how it actually works, especially on Mesa. > > Will it detect which platform it's on if I pass EGL_DEFAULT_DISPLAY ? For > example, if I want to use the same code for Wayland and X11. I think Mesa EGL will first look at environment variable EGL_PLATFORM for a hard-override of the chosen platform. Otherwise, it tries to detect a platform from the native display passed in, which EGL_DEFAULT_DISPLAY does not provide. Finally there is a build-time chosen fallback. eglGetDisplay itself is a bit problematic since it was not intended to support choosing the platform at runtime (only at EGL implementation build time). New code would be better using eglGetPlatformDisplay(EXT) if at all possible, especially when you want it to work on multiple platforms, or just to be safe that EGL does not guess wrong what kind of native display you are passing in. Guessing it wrong would cause nonsensical errors or crashes. This is also why using EGL_PLATFORM environment variable is not a good idea. FWIW, on Wayland, EGL_DEFAULT_DISPLAY will not allow you to render into a window. It would open a new Wayland connection, but your application windows are created through a connection you made yourself, so EGL would not be able to target your windows. Each wl_surface is private to the connection where it was created. Thanks, pq </blockquote></div>