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anholt / libepoxy

Epoxy is a library for handling OpenGL function pointer management for you
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glGetString displays (null) for nvidia-340xx #253

Closed wojnilowicz closed 3 years ago

wojnilowicz commented 3 years ago

Steps to reproduce: 1) unpack gl3.zip 2) compile gl3.cxx with "cc -o gl3 gl3.cxx -Dwith_epoxy=1 -lGL -lX11 -lepoxy" 3) run "./gl3"

Result: OpenGL vendor string: (null)

Expected result: OpenGL vendor string: NVIDIA Corporation

Additional info: 1) compiling gl3.cxx with "cc -o gl3 gl3.cxx -Dwith_epoxy=0 -lGL -lX11 -lepoxy" gives OpenGL vendor string: NVIDIA Corporation

2) compiling gl3.cxx with "cc -o gl3 gl3.cxx -Dwith_epoxy=1 /usr/lib64/libOpenGL.so /usr/lib64/libGLX.so -lX11 -lepoxy" gives OpenGL vendor string: (null)

3) compiling gl3.cxx with "cc -o gl3 gl3.cxx -Dwith_epoxy=0 /usr/lib64/libOpenGL.so /usr/lib64/libGLX.so -lX11 -lepoxy" gives libGL error: No matching fbConfigs or visuals found libGL error: failed to load driver: swrast X Error of failed request: GLXBadFBConfig Major opcode of failed request: 154 (GLX) Minor opcode of failed request: 0 () Serial number of failed request: 37 Current serial number in output stream: 37

4) reverting https://github.com/anholt/libepoxy/commit/dbfa4b209c0712b67dfeb8366c2ebe8503063b52 helps

5) KDE relies on info returned from glGetString to enable compositing, and after getting (null) for every query, the compositor remains disabled.

6) Fedora 34 X86_64, libepoxy 1.5.7, nvidia 340.108

Please fix this.

ebassi commented 3 years ago

This is a duplicate of #252.

ya-isakov commented 3 years ago

@wojnilowicz is it the same with cc -o gl3 gl3.cxx -Dwith_epoxy=1 -lX11 -lepoxy (just dropped linking with libOpenGL.so and libGLX.so, libepoxy should load them dynamically)

ya-isakov commented 3 years ago

@wojnilowicz also, could you, please, check if libGLX.so is provided by libglvnd?

wojnilowicz commented 3 years ago

@wojnilowicz is it the same with cc -o gl3 gl3.cxx -Dwith_epoxy=1 -lX11 -lepoxy (just dropped linking with libOpenGL.so and libGLX.so, libepoxy should load them dynamically)

Yes.

@wojnilowicz also, could you, please, check if libGLX.so is provided by libglvnd?

Yes.