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backend: add WLR_BACKEND env variable

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emersion 2018-05-15 00:07:41 +01:00
parent 98088e78df
commit a1631dd9ee
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2 changed files with 43 additions and 0 deletions
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42
backend/backend.c
View file

@ -6,6 +6,7 @@
#include <unistd.h>
#include <wayland-server.h>
#include <wlr/backend/drm.h>
#include <wlr/backend/headless.h>
#include <wlr/backend/interface.h>
#include <wlr/backend/libinput.h>
#include <wlr/backend/multi.h>
@ -101,6 +102,35 @@ static struct wlr_backend *attempt_x11_backend(struct wl_display *display,
}
#endif
static struct wlr_backend *attempt_headless_backend(
struct wl_display *display) {
struct wlr_backend *backend = wlr_headless_backend_create(display);
if (backend == NULL) {
return NULL;
}
size_t outputs = parse_outputs_env("WLR_HEADLESS_OUTPUTS");
for (size_t i = 0; i < outputs; ++i) {
wlr_headless_add_output(backend, 1280, 720);
}
return backend;
}
static struct wlr_backend *attempt_backend_by_name(struct wl_display *display,
const char *name) {
if (strcmp(name, "wayland") == 0) {
return attempt_wl_backend(display);
#ifdef WLR_HAS_X11_BACKEND
} else if (strcmp(name, "x11") == 0) {
return attempt_x11_backend(display, NULL);
#endif
} else if (strcmp(name, "headless") == 0) {
return attempt_headless_backend(display);
}
return NULL;
}
struct wlr_backend *wlr_backend_autocreate(struct wl_display *display) {
struct wlr_backend *backend = wlr_multi_backend_create(display);
if (!backend) {
@ -108,6 +138,18 @@ struct wlr_backend *wlr_backend_autocreate(struct wl_display *display) {
return NULL;
}
const char *name = getenv("WLR_BACKEND");
if (name) {
struct wlr_backend *subbackend = attempt_backend_by_name(display, name);
if (subbackend) {
wlr_multi_backend_add(backend, subbackend);
return backend;
} else {
wlr_log(L_ERROR, "unrecognized backend '%s'", name);
return NULL;
}
}
if (getenv("WAYLAND_DISPLAY") || getenv("_WAYLAND_DISPLAY") ||
getenv("WAYLAND_SOCKET")) {
struct wlr_backend *wl_backend = attempt_wl_backend(display);

1
docs/env_vars.md
View file

@ -5,6 +5,7 @@ wlroots specific
* *WLR_DRM_DEVICES*: specifies the DRM devices (as a colon separated list) instead of auto probing them. The first existing device in this list is considered the primary DRM device.
* *WLR_DRM_NO_ATOMIC*: set to 1 to use legacy DRM interface instead of atomic mode setting
* *WLR_LIBINPUT_NO_DEVICES*: set to 1 to not fail without any input devices
* *WLR_BACKEND*: force a specific backend to be used (one of: wayland, x11, headless)
* *WLR_WL_OUTPUTS*: when using the wayland backend specifies the number of outputs
* *WLR_X11_OUTPUTS*: when using the X11 backend specifies the number of outputs