Draw calls missing in apitrace (regression)

[linkmauve]

dbfa4b2 is the first bad commit.

This happens with apitrace master, gtk4-demo records everything (?) except draw calls like glDrawArrays().

[batesj]

It looks like before that commit, there was a bug that caused libGL.so to always be used even if libOpenGL.so was present. After the commit, libOpenGL.so will be used if it is found, else libGL.so will be used.

[ya-isakov]

@linkmauve could you please check, if there is libOpenGL.so.0 in your system libraries (I have it in /usr/lib64), and move it somewhere else to test, if it will fix your issue? My guess is that apitrace doesn't support libglvnd.

[ya-isakov]

Also it is worthy to check if setting TRACE_LIBGL=libOpenGL.so.0 will help or not. This will work only if you move libOpenGL.so.0 back.

[evelikov]

@ya-isakov libglvnd should just work, even if libepoxy uses libOpenGL.so while apitrace does libGL.so. Albeit small, there's a possibility of this might be a libglvnd bug in itself.

If it were me, first I would check if apitrace wraps dlsym and {egl,glX}GetProcAddress to intercept all GL dispatch (glDrawArray or otherwise) and see in which library we end on the problematic call(s).

[ebassi]

Commit was reverted, and I released 1.5.8.