def create_initialized_headless_egl_display():
"""Creates an initialized EGL display directly on a device."""
all_devices = EGL.eglQueryDevicesEXT()
selected_device = os.environ.get('EGL_DEVICE_ID', None)
if selected_device is None:
candidates = all_devices
else:
device_idx = int(selected_device)
if not 0 <= device_idx < len(all_devices):
raise RuntimeError(
f'EGL_DEVICE_ID must be an integer between 0 and '
f'{len(all_devices) - 1} (inclusive), got {device_idx}.')
candidates = all_devices[device_idx:device_idx + 1]
for device in candidates:
display = EGL.eglGetPlatformDisplayEXT(
EGL.EGL_PLATFORM_DEVICE_EXT, device, None)
if display != EGL.EGL_NO_DISPLAY and EGL.eglGetError() == EGL.EGL_SUCCESS:
# `eglInitialize` may or may not raise an exception on failure depending
# on how PyOpenGL is configured. We therefore catch a `GLError` and also
# manually check the output of `eglGetError()` here.
try:
initialized = EGL.eglInitialize(display, None, None)
except error.GLError:
pass
else:
if initialized == EGL.EGL_TRUE and EGL.eglGetError() == EGL.EGL_SUCCESS:
return display
return EGL.EGL_NO_DISPLAY
def create_initialized_headless_egl_display():
"""Creates an initialized EGL display directly on a device."""
display = EGL.EGL_NO_DISPLAY
devices = EGL.eglQueryDevicesEXT()
for device in devices:
display = EGL.eglGetPlatformDisplayEXT(
EGL.EGL_PLATFORM_DEVICE_EXT, device, None)
if display and EGL.eglGetError() == EGL.EGL_SUCCESS:
initialized = EGL.eglInitialize(display, None, None)
if EGL.eglGetError() == EGL.EGL_SUCCESS and initialized == EGL.EGL_TRUE:
break
else:
display = EGL.EGL_NO_DISPLAY
return display
def create_initialized_headless_egl_display():
"""Creates an initialized EGL display directly on a device."""
for device in EGL.eglQueryDevicesEXT():
display = EGL.eglGetPlatformDisplayEXT(EGL.EGL_PLATFORM_DEVICE_EXT,
device, None)
if display != EGL.EGL_NO_DISPLAY and EGL.eglGetError(
) == EGL.EGL_SUCCESS:
# `eglInitialize` may or may not raise an exception on failure depending
# on how PyOpenGL is configured. We therefore catch a `GLError` and also
# manually check the output of `eglGetError()` here.
try:
initialized = EGL.eglInitialize(display, None, None)
except error.GLError:
pass
else:
if initialized == EGL.EGL_TRUE and EGL.eglGetError(
) == EGL.EGL_SUCCESS:
return display
return EGL.EGL_NO_DISPLAY