aboutsummaryrefslogtreecommitdiff
path: root/backend/backend.c
blob: ff5603bde9e9669fc92b9900b6bc20fcd3faff68 (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
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
#include <assert.h>
#include <errno.h>
#include <libinput.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <wayland-server.h>
#include <wlr/backend/drm.h>
#include <wlr/backend/interface.h>
#include <wlr/backend/libinput.h>
#include <wlr/backend/multi.h>
#include <wlr/backend/session.h>
#include <wlr/backend/wayland.h>
#include <wlr/config.h>
#include <wlr/util/log.h>

/* WLR_HAS_X11_BACKEND needs to be after wlr/config.h */
#ifdef WLR_HAS_X11_BACKEND
#include <wlr/backend/x11.h>
#endif

void wlr_backend_init(struct wlr_backend *backend,
		const struct wlr_backend_impl *impl) {
	assert(backend);
	backend->impl = impl;
	wl_signal_init(&backend->events.destroy);
	wl_signal_init(&backend->events.new_input);
	wl_signal_init(&backend->events.new_output);
}

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) {
		return;
	}

	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;
}

struct wlr_renderer *wlr_backend_get_renderer(struct wlr_backend *backend) {
	if (backend->impl->get_renderer) {
		return backend->impl->get_renderer(backend);
	}
	return NULL;
}

static int parse_outputs_env(const char *name) {
	const char *outputs_str = getenv(name);
	if (outputs_str == NULL) {
		return 1;
	}

	char *end;
	int outputs = (int)strtol(outputs_str, &end, 10);
	if (*end || outputs < 0) {
		wlr_log(L_ERROR, "%s specified with invalid integer, ignoring", name);
		return 1;
	}

	return outputs;
}

static struct wlr_backend *attempt_wl_backend(struct wl_display *display) {
	struct wlr_backend *backend = wlr_wl_backend_create(display, NULL);
	if (backend == NULL) {
		return NULL;
	}

	int outputs = parse_outputs_env("WLR_WL_OUTPUTS");
	for (int i = 0; i < outputs; ++i) {
		wlr_wl_output_create(backend);
	}

	return backend;
}

static struct wlr_backend *attempt_x11_backend(struct wl_display *display,
		const char *x11_display) {
	struct wlr_backend *backend = wlr_x11_backend_create(display, x11_display);
	if (backend == NULL) {
		return NULL;
	}

	int outputs = parse_outputs_env("WLR_X11_OUTPUTS");
	for (int i = 0; i < outputs; ++i) {
		wlr_x11_output_create(backend);
	}

	return backend;
}

struct wlr_backend *wlr_backend_autocreate(struct wl_display *display) {
	struct wlr_backend *backend = wlr_multi_backend_create(display);
	if (!backend) {
		wlr_log(L_ERROR, "could not allocate multibackend");
		return NULL;
	}

	if (getenv("WAYLAND_DISPLAY") || getenv("_WAYLAND_DISPLAY") ||
			getenv("WAYLAND_SOCKET")) {
		struct wlr_backend *wl_backend = attempt_wl_backend(display);
		if (wl_backend) {
			wlr_multi_backend_add(backend, wl_backend);
			return backend;
		}
	}

#ifdef WLR_HAS_X11_BACKEND
	const char *x11_display = getenv("DISPLAY");
	if (x11_display) {
		struct wlr_backend *x11_backend =
			attempt_x11_backend(display, x11_display);
		if (x11_backend) {
			wlr_multi_backend_add(backend, x11_backend);
			return backend;
		}
	}
#endif

	// Attempt DRM+libinput
	struct wlr_session *session = wlr_session_create(display);
	if (!session) {
		wlr_log(L_ERROR, "Failed to start a DRM session");
		wlr_backend_destroy(backend);
		return NULL;
	}

	struct wlr_backend *libinput = wlr_libinput_backend_create(display, session);
	if (libinput) {
		wlr_multi_backend_add(backend, libinput);
	} else {
		wlr_log(L_ERROR, "Failed to start libinput backend");
		wlr_backend_destroy(backend);
		wlr_session_destroy(session);
		return NULL;
	}

	int gpus[8];
	size_t num_gpus = wlr_session_find_gpus(session, 8, gpus);
	struct wlr_backend *primary_drm = NULL;
	wlr_log(L_INFO, "Found %zu GPUs", num_gpus);

	for (size_t i = 0; i < num_gpus; ++i) {
		struct wlr_backend *drm = wlr_drm_backend_create(display, session,
			gpus[i], primary_drm);
		if (!drm) {
			wlr_log(L_ERROR, "Failed to open DRM device");
			continue;
		}

		if (!primary_drm) {
			primary_drm = drm;
		}

		wlr_multi_backend_add(backend, drm);
	}

	if (!primary_drm) {
		wlr_log(L_ERROR, "Failed to open any DRM device");
		wlr_backend_destroy(libinput);
		wlr_session_destroy(session);
		wlr_backend_destroy(backend);
		return NULL;
	}

	return backend;
}

uint32_t usec_to_msec(uint64_t usec) {
	return (uint32_t)(usec / 1000);
}