How OSMesa bootstraps the GL renderer to output to main memory

"MC player" <[email protected]>
Newsgroups gmane.comp.freedesktop.xorg.drivers.freedreno,gmane.comp.video.mesa3d.user
Message-ID <[email protected]> 
How OSMesa bootstraps the GL renderer to output to main memory? I have seen Osmesa source code, but I don't know much. I guess Osmesa is some of the information inside the GL context to boot the output location of the renderer, but I am uncertain, can anyone tell me some more detailed things?
I am trying to make Vulkan output to the surface created by EGL, but I don't know how to "boot" VK, but I see OSMESA to make Zink to the client memory. So I guess whether this is related to the information stored with the context In addition, I don't know what changes will be made after the context is bound to the window.
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