[Mesa-dev] [Bug 38869] Cannot create a valid pBuffer with height and/or width of zero

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Wed Jul 20 07:25:36 PDT 2011


--- Comment #1 from Brian Paul <brian.e.paul at gmail.com> 2011-07-20 07:25:36 PDT ---
"Both the EGL and GLX specifications allow pbuffers to be created with a height
and/or width of zero (and these are the default values)."
"Other implementations throw a BAD_VALUE error in this case although this is
part of either specification."

I'm not clear on what you're saying.  According to the GLX spec, it looks like
a size 0 x 0 pbuffer is legal.  But are you saying other implementations throw
BadValue if you try that?

In Mesa, have you tried removing the width==0 || height==0 check?  If so, what
happens when you create a 0x0 pbuffer?

Also, off-hand, I don't know of a way to directly generate an X error with Xlib
calls.  Remember, the fake GLX layer we're talking about here has no internal
hooks into X so we can't do everything that the real GLX library does.  I
suppose we could set up an unrelated protocol request that purposely has bad
arguments to generate the error.  If you need this, could you try to implement

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