undefined symbol: glEGLImageTargetTexStorageEXT

[omar-polo]

Hello,

picom fails to build on OpenBSD due to a linker error:

ld: error: undefined symbol: glEGLImageTargetTexStorageEXT
>>> referenced by egl.c:273 (../src/backend/gl/egl.c:273)
>>>               src/picom.p/backend_gl_egl.c.o:(egl_bind_pixmap)

The compiler doesn't report any warning while compiling, but the linking faills. There's a prototype for glEGLImageTargetTexStorageEXT, but I guess the function pointer needs to be retrieved via eglGetProcAddress? I'm not sure. I don't have any prior experience with opengl, mesa or X11 rendering in general, so please review this diff with extra care.

I've come up with this diff that at least allows to build and seems to work. I'm running picom --config /dev/null --vsync --backend egl.

Note that it's lacking a cast on the return of eglGetProcAddress, and I'm not sure I'm using eglGetProcAddress in an idiomatic way.

Thanks!

[codecov]

Codecov Report

Merging #930 (2d35f78) into next (ec02fc6) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             next     #930      +/-   ##
==========================================
- Coverage   37.74%   37.72%   -0.02%     
==========================================
  Files          48       48              
  Lines       10656    10661       +5     
==========================================
  Hits         4022     4022              
- Misses       6634     6639       +5     

Impacted Files	Coverage Δ
src/backend/gl/egl.c	24.88% <0.00%> (-0.59%)	⬇️

[omar-polo]

Thanks!