vo_opengl: improve robustness against PBO failure

If PBO upload fails, disable PBOs and revert to the normal codepath. In
theory we should retry PBO upload on failure (because OpenGL specifies
that it can sporadically fail), but since it normally doesn't happen,
and the fallback will work, I'm not bothering.

Some restructuring is needed, since glUnmapBuffer needs to be called
earlier. In fact, the old code structure didn't make too much sense, and
is a leftover from MPlayer's direct rendering support, which let the
decoder decode to a PBO-mapped region. This means the buffer_ptr field
can be dropped. Drop buffer_size as well, since it only had 2 possible
values (0 or the size required for the current config).

0 files changed, 0 insertions, 0 deletions