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native: Add headless mode using surfaceless EGL context

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This eliminates the need for any render node or device nodes, thus can
be used without any graphics hardware available at all, or with a
graphics driver without any render node available.

The surfaceless mode currently requires EGL_KHR_no_config_context to
configure the initial EGL display.

This also means we can enable the native backend tests in CI, as it
should work without any additional privileges.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1698>
This commit is contained in:
Jonas Ådahl
2021-02-09 14:32:55 +01:00
committed by Marge Bot
parent ee4a0dae7c
commit 634c948fc6
5 changed files with 130 additions and 40 deletions
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12
src/backends/native/meta-backend-native.c
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@ -144,6 +144,12 @@ maybe_disable_screen_cast_dma_bufs (MetaBackendNative *native)
};
primary_gpu = meta_renderer_native_get_primary_gpu (renderer_native);
if (!primary_gpu)
{
g_message ("Disabling DMA buffer screen sharing (surfaceless)");
goto disable_dma_bufs;
}
kms_device = meta_gpu_kms_get_kms_device (primary_gpu);
driver_name = meta_kms_device_get_driver_name (kms_device);
@ -157,6 +163,7 @@ maybe_disable_screen_cast_dma_bufs (MetaBackendNative *native)
g_message ("Disabling DMA buffer screen sharing for driver '%s'.",
driver_name);
disable_dma_bufs:
meta_screen_cast_disable_dma_bufs (screen_cast);
}
#endif /* HAVE_REMOTE_DESKTOP */
@ -473,7 +480,7 @@ init_gpus (MetaBackendNative *native,
GList *l;
devices = meta_udev_list_drm_devices (udev, error);
if (!devices)
if (*error)
return FALSE;
for (l = devices; l; l = l->next)
@ -498,7 +505,8 @@ init_gpus (MetaBackendNative *native,
g_list_free_full (devices, g_object_unref);
if (g_list_length (meta_backend_get_gpus (backend)) == 0)
if (!native->is_headless &&
g_list_length (meta_backend_get_gpus (backend)) == 0)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_NOT_FOUND,
"No GPUs found");