EGL/GBM troubles

[abandoned-cocoon]

It seems that

prefix = 'EGL_'
assumed_version = [1,0]
version_prefix = 'EGL_VERSION_EGL_'

in raw/EGL/_types.py gives errors and should be

prefix = as_8_bit('EGL_')
assumed_version = [1,0]
version_prefix = as_8_bit('EGL_VERSION_EGL_')

The other issue is that I cannot call eglGetPlatformDisplayEXT to get a display because it's marked as part of an extension and pyopengl tries to check if the extension is present without specifying a display but my egl implementation (glvnd/mesa) answers with an error.
My workaround right now is

import OpenGL
import OpenGL.platform.egl
OpenGL.platform.PLATFORM = p = OpenGL.platform.egl.EGLPlatform()
from OpenGL.EGL import *
from OpenGL.EGL.EXT.platform_base import *
from OpenGL.EGL.MESA.platform_gbm import *
import ctypes

with open("/dev/dri/renderD128", "w") as f:
	gbm = ctypes.CDLL("libgbm.so")
	dev = gbm.gbm_create_device(f.fileno())

	eglGetPlatformDisplayEXT.extension = None
	oc = p.__class__.constructFunction
	def nc(*args, **kwargs):
		kwargs.update({"force_extension": True})
		return oc(p, *args, **kwargs)

	p.constructFunction = nc
	dpy = eglGetPlatformDisplayEXT(EGL_PLATFORM_GBM_MESA, ctypes.c_void_p(dev), ctypes.c_void_p(0))
	del p.constructFunction
	print(dpy)

[mcfletch]

So I've worked on getting GBM support working relatively well. You can now find tests/os_egl.py in the develop branch which does both GBM and EGL enumeration context setups. I'm going to close the ticket for now, if there are further problems, let me know.