https://bugs.freedesktop.org/show_bug.cgi?id=100425
Bug ID: 100425
Summary: glGenFramebuffersEXT appears to be null on (some?)
Mesa 12.0.6 systems
Product: Mesa
Version: 12.0
Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: GLX
Assignee: [email protected]
Reporter: [email protected]
QA Contact: [email protected]
Chromium is seeing GPU process crash reports on Linux with Mesa 12.0.6 in which
the function glGenFramebuffersEXT appears to be null. This is seen on Intel
mostly, some NVIDIA and a few AMD.
We have not tried to reproduce it as we don't have such a system on hand
(sorry). It may be reproducible by running Chrome 57.0 Stable (snapshot below)
on a Mesa 12.0.6 system and using WebGL 2.0: http://webglreport.com/?v=2 . See
chrome://gpu for GPU process logs.
https://commondatastorage.googleapis.com/chromium-browser-snapshots/index.html?prefix=Linux_x64/444952/
(chrome-linux.zip)
The glGenFramebuffersEXT call in question:
https://chromium.googlesource.com/chromium/src/+/57.0.2987.110/gpu/command_buffer/service/feature_info.cc#872
Here is the generated code for retrieving glGenFramebuffersEXT. Note that it
should be requesting "glGenFramebuffers" on GL 3.0+.
https://cs.chromium.org/chromium/src/ui/gl/gl_bindings_autogen_gl.cc?l=1206&rcl=57.0.2987.110
GetGLProcAddress calls g_get_proc_address:
https://cs.chromium.org/chromium/src/ui/gl/gl_implementation.cc?l=126&rcl=57.0.2987.110
Which should be glXGetProcAddress on Linux:
https://cs.chromium.org/chromium/src/ui/gl/init/gl_initializer_x11.cc?l=58&rcl=57.0.2987.110
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