[Bug 94148] Framebuffer considered invalid when a draw call is done before glCheckFramebufferStatus

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94148

--- Comment #5 from Ilia Mirkin <imirkin at alum.mit.edu> ---
(In reply to Corentin Wallez from comment #4)
> I believe I stumbled on the same bug when running the WebGL CTS on Mesa
> 11.2's core 3.3 context. The specific failing case is
> https://www.khronos.org/registry/webgl/sdk/tests/conformance/extensions/oes-
> texture-half-float.html that is flaky about 2/3 of the time. A standalone
> repro case is available here:
> https://github.com/Kangz/GLDriverBugs/blob/master/fbo_completness_caching/
> Main.cpp

I can confirm that this happens with the repro on mesa mainline with i965/SKL,
but not any st/mesa-based drivers. The error I get is

User error: GL_INVALID_FRAMEBUFFER_OPERATION in glReadPixels(incomplete
framebuffer)

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