A quick grep seems to suggest it's the responsibility of each EGL
platform to re-implement the environment check:
$ grep -r LIBGL_ALWAYS_SOFT src
src/glx/glxext.c: glx_accel = (getenv("LIBGL_ALWAYS_SOFTWARE") == NULL);
src/glx/apple/apple_visual.c: else if (getenv("LIBGL_ALWAYS_SOFTWARE") !=
NULL) {
src/egl/drivers/dri2/platform_wayland.c: int hw_accel =
(getenv("LIBGL_ALWAYS_SOFTWARE") == NULL);
src/egl/drivers/dri2/platform_x11.c: int x11_dri2_accel =
(getenv("LIBGL_ALWAYS_SOFTWARE") == NULL);
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https://bugs.launchpad.net/bugs/1543952
Title:
Mir binaries ignore Mesa setting LIBGL_ALWAYS_SOFTWARE=1 and only ever
try hardware acceleration
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