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

[Ralf Jung]

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Hi,

> OK, the presence of glDrawBuffer(GL_FRONT) in the linked code plus 
> the glFinish()/glFlush()es made it look like you were.
I did some experimenting with manual copying... also, the code will
clearly show that I am very inexperienced at GL ;-)

> You don't need any flushing after a swapbuffers.
I added that in an attempt tog et more predictable timing behaviour...
to no avail, however. It still spends 99% of the time (that is, the
blocking between two frames in glClear, which I don't understand - I'd
expect it to do that in swap buffers or at least in glFinish, bit no,
it blocks in glClear.

Kind regards,
Ralf
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