"""Чем рисует OpenGL в контейнере: видеокарта или программный llvmpipe.

    docker run --rm -e DISPLAY=:0 -v /tmp/.X11-unix:/tmp/.X11-unix \
        -v "$PWD/docker:/smoke:ro" flyguard python3 /smoke/gl_probe.py

Окно не открывается: контекст создаётся на pbuffer 1×1 через EGL.
"""
import ctypes
import sys

EGL_OPENGL_API = 0x30A2
EGL_SURFACE_TYPE, EGL_PBUFFER_BIT = 0x3033, 0x0001
EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT = 0x3040, 0x0008
EGL_WIDTH, EGL_HEIGHT, EGL_NONE = 0x3057, 0x3056, 0x3038
GL_VENDOR, GL_RENDERER, GL_VERSION = 0x1F00, 0x1F01, 0x1F02

egl = ctypes.CDLL("libEGL.so.1")
gl = ctypes.CDLL("libGL.so.1")
egl.eglGetDisplay.restype = ctypes.c_void_p
egl.eglGetDisplay.argtypes = [ctypes.c_void_p]
egl.eglInitialize.argtypes = [ctypes.c_void_p, ctypes.c_void_p, ctypes.c_void_p]
egl.eglChooseConfig.argtypes = [ctypes.c_void_p, ctypes.c_void_p, ctypes.c_void_p,
                                ctypes.c_int, ctypes.c_void_p]
egl.eglCreatePbufferSurface.restype = ctypes.c_void_p
egl.eglCreatePbufferSurface.argtypes = [ctypes.c_void_p, ctypes.c_void_p, ctypes.c_void_p]
egl.eglCreateContext.restype = ctypes.c_void_p
egl.eglCreateContext.argtypes = [ctypes.c_void_p, ctypes.c_void_p, ctypes.c_void_p,
                                 ctypes.c_void_p]
egl.eglMakeCurrent.argtypes = [ctypes.c_void_p] * 4
gl.glGetString.restype = ctypes.c_char_p

dpy = egl.eglGetDisplay(None)
if not dpy or not egl.eglInitialize(dpy, None, None):
    sys.exit("EGL не инициализировался (нет DISPLAY?)")
egl.eglBindAPI(EGL_OPENGL_API)
attrs = (ctypes.c_int * 5)(EGL_SURFACE_TYPE, EGL_PBUFFER_BIT,
                           EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT, EGL_NONE)
cfg, n = ctypes.c_void_p(), ctypes.c_int()
if not egl.eglChooseConfig(dpy, attrs, ctypes.byref(cfg), 1, ctypes.byref(n)) or n.value < 1:
    sys.exit("нет подходящей конфигурации EGL")
surf = egl.eglCreatePbufferSurface(dpy, cfg, (ctypes.c_int * 5)(EGL_WIDTH, 1, EGL_HEIGHT, 1,
                                                               EGL_NONE))
ctx = egl.eglCreateContext(dpy, cfg, None, None)
if not ctx or not egl.eglMakeCurrent(dpy, surf, surf, ctx):
    sys.exit("контекст OpenGL не создан")
renderer = gl.glGetString(GL_RENDERER).decode()
print("vendor:  ", gl.glGetString(GL_VENDOR).decode())
print("renderer:", renderer)
print("version: ", gl.glGetString(GL_VERSION).decode())
print("ПРОГРАММНО (процессор)" if "llvmpipe" in renderer or "softpipe" in renderer
      else "ВИДЕОКАРТА")