[Mesa-dev] EGL and glClear(): Nothing is drawn on screen

[Eric Anholt]

Ralf Jung <post at ralfj.de> writes:

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> Hi,
>
>>> I am not using GLES, but normal OpenGL through EGL. And I am 
>>> pretty sure it's double-buffered - as far as I understood it, 
>>> that's the default, and I did not attempt to override it in any 
>>> way (like calling glDrawBuffer).
>> 
>> Oh, our EGL implementation is not prepared for frontbuffer 
>> rendering at all.
> I do not render into the frontbuffer. I render to the backbuffer, as
> usual, and then call eglSwapBuffers. See
> <http://www.ralfj.de/git/gltest.git/blob/refs/heads/master:/gltest.cpp#l138>

OK, the presence of glDrawBuffer(GL_FRONT) in the linked code plus the
glFinish()/glFlush()es made it look like you were.  You don't need any
flushing after a swapbuffers.
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