aboutsummaryrefslogtreecommitdiff
path: root/backend/backend.c
blob: 790a14b3ddd0f7ae3a111e4d55c3507f5b75472e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
#include <wayland-server.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include <libinput.h>
#include <wlr/backend/session.h>
#include <wlr/backend/interface.h>
#include <wlr/backend/drm.h>
#include <wlr/backend/libinput.h>
#include <wlr/backend/wayland.h>
#include <wlr/backend/multi.h>
#include <wlr/util/log.h>
#include "backend/udev.h"

void wlr_backend_init(struct wlr_backend *backend,
		const struct wlr_backend_impl *impl) {
	assert(backend);
	backend->impl = impl;
	wl_signal_init(&backend->events.input_add);
	wl_signal_init(&backend->events.input_remove);
	wl_signal_init(&backend->events.output_add);
	wl_signal_init(&backend->events.output_remove);
}

bool wlr_backend_start(struct wlr_backend *backend) {
	if (backend->impl->start) {
		return backend->impl->start(backend);
	}
	return true;
}

void wlr_backend_destroy(struct wlr_backend *backend) {
	if (backend->impl && backend->impl->destroy) {
		backend->impl->destroy(backend);
	} else {
		free(backend);
	}
}

struct wlr_egl *wlr_backend_get_egl(struct wlr_backend *backend) {
	if (backend->impl->get_egl) {
		return backend->impl->get_egl(backend);
	}
	return NULL;
}

static struct wlr_backend *attempt_wl_backend(struct wl_display *display) {
	struct wlr_backend *backend = wlr_wl_backend_create(display);
	if (backend) {
		int outputs = 1;
		const char *_outputs = getenv("WLR_WL_OUTPUTS");
		if (_outputs) {
			char *end;
			outputs = (int)strtol(_outputs, &end, 10);
			if (*end) {
				wlr_log(L_ERROR, "WLR_WL_OUTPUTS specified with invalid integer, ignoring");
				outputs = 1;
			} else if (outputs < 0) {
				wlr_log(L_ERROR, "WLR_WL_OUTPUTS specified with negative outputs, ignoring");
				outputs = 1;
			}
		}
		while (outputs--) {
			wlr_wl_output_create(backend);
		}
	}
	return backend;
}

struct wlr_backend *wlr_backend_autocreate(struct wl_display *display) {
	struct wlr_backend *backend;
	if (getenv("WAYLAND_DISPLAY") || getenv("_WAYLAND_DISPLAY")) {
		backend = attempt_wl_backend(display);
		if (backend) {
			return backend;
		}
	}

	if (getenv("DISPLAY")) {
		wlr_log(L_ERROR, "X11 backend is not implemented"); // TODO
		return NULL;
	}

	// Attempt DRM+libinput

	struct wlr_session *session = wlr_session_start(display);
	if (!session) {
		wlr_log(L_ERROR, "Failed to start a DRM session");
		return NULL;
	}

	struct wlr_udev *udev = wlr_udev_create(display);
	if (!udev) {
		wlr_log(L_ERROR, "Failed to start udev");
		goto error_session;
	}

	int gpu = wlr_udev_find_gpu(udev, session);
	if (gpu == -1) {
		wlr_log(L_ERROR, "Failed to open DRM device");
		goto error_udev;
	}

	backend = wlr_multi_backend_create(session, udev);
	if (!backend) {
		goto error_gpu;
	}

	struct wlr_backend *libinput = wlr_libinput_backend_create(display, session, udev);
	if (!libinput) {
		goto error_multi;
	}

	struct wlr_backend *drm = wlr_drm_backend_create(display, session, udev, gpu);
	if (!drm) {
		goto error_libinput;
	}

	wlr_multi_backend_add(backend, libinput);
	wlr_multi_backend_add(backend, drm);
	return backend;

error_libinput:
	wlr_backend_destroy(libinput);
error_multi:
	wlr_backend_destroy(backend);
error_gpu:
	wlr_session_close_file(session, gpu);
error_udev:
	wlr_udev_destroy(udev);
error_session:
	wlr_session_finish(session);
	return NULL;
}