glx: Demand success from CreateContext requests (v2)

GLXCreate{,New}Context, like most X resource creation requests, does not
emit a reply and therefore is emitted into the X stream asynchronously.
However, unlike most resource creation requests, the GLXContext we
return is a handle to library state instead of an XID. So if context
creation fails for any reason - say, the server doesn't support indirect
contexts - then we will fail in strange places for strange reasons.

We could make every GLX entrypoint robust against half-created contexts,
or we could just verify that context creation worked. Reuse the
__glXIsDirect code to do this, as a cheap way of verifying that the
XID is real.

glXCreateContextAttribsARB solves this by using the _checked version of
the xcb command, so effectively this change makes the classic context
creation paths as robust as CreateContextAttribs.

v2: Better use of Bool, check that error != NULL first (Olivier Fourdan)

Signed-off-by: Adam Jackson <[email protected]>
Reviewed-by: Michel Dänzer <[email protected]>

0 files changed, 0 insertions, 0 deletions