Code review comment for lp:~cameronnemo/pantheon-greeter/optional-gl

also the bug report stated that it should work it egl also known as opengl es.
to fix the bug you also need to make it working with opengl es function: https://www.khronos.org/registry/gles/specs/1.1/es_cm_spec_1.1.12.pdf

otherwise we would lose functionality/apperance on arm build.