[Mesa-dev] [Bug 57098] New: Many extension functions exported by libGL.so.1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=57098

          Priority: medium
            Bug ID: 57098
          Assignee: mesa-dev at lists.freedesktop.org
           Summary: Many extension functions exported by libGL.so.1
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: amonakov at gmail.com
          Hardware: Other
            Status: NEW
           Version: git
         Component: Other
           Product: Mesa

Created attachment 70035
  --> https://bugs.freedesktop.org/attachment.cgi?id=70035&action=edit
GL exports checking script

Current OpenGL ABI specifies that libraries need not export functions beyond
GLX 1.4, OpenGL 1.2 and GL_ARB_multitexture.  Anything else must be obtained
via glXGetProcAddress.  Current Mesa exports a lot more than that, and I was
told today on #dri-devel IRC that it's a bug that ought to be reported.

I'm attaching a simple script that has a whitelist of OpenGL functions
corresponding to the above ABI subset, and prints exported functions that are
not from that subset.  The whitelist counts 494 functions, and running the
script on my git build of Mesa produces a list of 848 functions.

Known (to me) applications that ignore the OpenGL ABI and explicitely link
against extension functions:

1. Braid. My bugreport here:
https://bugzilla.icculus.org/show_bug.cgi?id=5759#c0
2. Trine 2. No public bugzilla, reported to developers in private e-mail.
3. Enemy Territory: tries to use dlopen instead of glXGetProcAddress.
4. Waking Mars. Not reported yet.
5. Steam for Linux. List of imported extensions here:
https://github.com/amonakov/primus/issues/21#issuecomment-10185661
6. Some Webkit-related library used in Linux Steam attempts to load extensions
with dlopen. Not analyzed, not reported yet.

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