[Bug 98784] Talos Principle rendering flickering garbage on start instead of its logo and loading squares

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98784

--- Comment #15 from Michel Dänzer <michel at daenzer.net> ---
Thanks for raising the issue with Croteam.

(In reply to Germano Massullo from comment #14)
> I've just double checked and we definately set GL_DRAW_FRAMEBUFFER to 0
> (default back buffer) before clear.

When I look at the trace from comment #10 in qapitrace, I see a bunch of
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, ...) calls in frame 0, the last one
being

 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 31)

After that, there are no glBindFramebuffer calls for a long time.
GL_DRAW_FRAMEBUFFER isn't set to 0 before frame 777, after which the flickering
stops, and the window contents start looking as expected.

I've now also confirmed this with running glretrace in gdb and setting a
breakpoint at _mesa_BindFramebuffer.

I'd definitely like somebody else to confirm the above though, to make sure I'm
not missing anything.

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