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libweston: allow loading multiple backends

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Before loading a backend, clear the weston_compositor::backend pointer
to check whether the backend supports multi-backend operation and adds
itself to the weston_compositor::backend_list.

Keep weston_compositor::backend pointing to the last loaded backend
either way, to allow the calling compositor code to store it away for
later, to check whether a head belongs to a given backend in the output
configuration code. This workaround can be removed after all backends
are converted to be multi-backend aware.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
This commit is contained in:
Philipp Zabel 2021-03-16 16:28:20 +01:00 committed by Derek Foreman
parent 3d50069afc
commit 20c5b4527c
2 changed files with 19 additions and 6 deletions
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3
include/libweston/libweston.h
View File

@ -1480,6 +1480,9 @@ struct weston_compositor {
/* Whether to let the compositor run without any input device. */
bool require_input;
/* Whether to load multiple backends. */
bool multi_backend;
/* Test suite data */
struct weston_testsuite_data test_data;

22
libweston/compositor.c
View File

@ -9545,14 +9545,12 @@ weston_compositor_load_backend(struct weston_compositor *compositor,
int (*backend_init)(struct weston_compositor *c,
struct weston_backend_config *config_base);
if (compositor->backend) {
weston_log("Error: attempt to load a backend when one is already loaded\n");
return -1;
}
if (backend >= ARRAY_LENGTH(backend_map))
return -1;
/* Clear backend pointer to catch multi-backend incapable backends. */
compositor->backend = NULL;
backend_init = weston_load_module(backend_map[backend],
"weston_backend_init",
LIBWESTON_MODULEDIR);
@ -9564,7 +9562,19 @@ weston_compositor_load_backend(struct weston_compositor *compositor,
return -1;
}
wl_list_insert(&compositor->backend_list, &compositor->backend->link);
/* Multi-backend capable backends add themselves to the backend_list. */
if (compositor->backend) {
if (compositor->multi_backend) {
weston_log("error: backend does not support multi-backend operation\n");
return -1;
}
wl_list_insert(&compositor->backend_list,
&compositor->backend->link);
}
/* Point compositor->backend to the last loaded backend. */
compositor->backend = wl_container_of(compositor->backend_list.next,
compositor->backend, link);
return 0;
}