[PATCH] compositor: Add support for external back-ends

Krzysztof Konopko kris at youview.com
Thu Sep 8 14:45:13 UTC 2016


This commit adds ability to load external back-end implementations which is
required if they are not (and can not be) maintained within 'weston' tree.

libweston-backend is introduced to provide common back-end functionality to
external implementations.  Also few required functions are exported as
well and libweston-backend.so library is introduced.

Signed-off-by: Krzysztof Konopko <kris at youview.com>
---
 Makefile.am               | 63 +++++++++++++++++++++++++----------------------
 compositor/main.c         |  7 +++---
 libweston/compositor.c    | 16 ++++++++++++
 libweston/compositor.h    | 10 ++++++++
 libweston/libinput-seat.c | 10 ++++----
 libweston/libweston.pc.in |  2 +-
 shared/config-parser.c    |  2 +-
 shared/option-parser.c    |  4 ++-
 8 files changed, 73 insertions(+), 41 deletions(-)

diff --git a/Makefile.am b/Makefile.am
index 1e63a58..d65646e 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -205,30 +205,6 @@ weston_SOURCES =                                   \
 compositor/main.c : $(top_builddir)/libweston/git-version.h
 libweston/compositor.c : $(top_builddir)/libweston/git-version.h

-noinst_LTLIBRARIES +=                          \
-       libsession-helper.la
-
-libsession_helper_la_SOURCES =                 \
-       libweston/launcher-util.c               \
-       libweston/launcher-util.h               \
-       libweston/launcher-impl.h               \
-       libweston/weston-launch.h               \
-       libweston/launcher-weston-launch.c      \
-       libweston/launcher-direct.c
-libsession_helper_la_CFLAGS = $(AM_CFLAGS) $(LIBDRM_CFLAGS) $(PIXMAN_CFLAGS) $(COMPOSITOR_CFLAGS)
-libsession_helper_la_LIBADD = $(LIBDRM_LIBS)
-
-if ENABLE_DBUS
-if HAVE_SYSTEMD_LOGIN
-libsession_helper_la_SOURCES +=                        \
-       libweston/dbus.h                        \
-       libweston/dbus.c                        \
-       libweston/launcher-logind.c
-libsession_helper_la_CFLAGS += $(SYSTEMD_LOGIN_CFLAGS) $(DBUS_CFLAGS)
-libsession_helper_la_LIBADD += $(SYSTEMD_LOGIN_LIBS) $(DBUS_LIBS)
-endif
-endif
-
 if HAVE_GIT_REPO
 libweston/git-version.h : $(top_srcdir)/.git/logs/HEAD
        $(AM_V_GEN)echo "#define BUILD_ID \"$(shell git --git-dir=$(top_srcdir)/.git describe --always --dirty) $(shell git --git-dir=$(top_srcdir)/.git log -1 --format='%s (%ci)')\"" > $@
@@ -285,8 +261,11 @@ libwestoninclude_HEADERS =                 \
        libweston/compositor-rdp.h              \
        libweston/compositor-wayland.h          \
        libweston/compositor-x11.h              \
+       libweston/launcher-util.h               \
+       libweston/libinput-seat.h               \
        libweston/plugin-registry.h             \
        libweston/timeline-object.h             \
+       protocol/presentation-time-server-protocol.h    \
        shared/matrix.h                         \
        shared/config-parser.h                  \
        shared/zalloc.h
@@ -337,7 +316,12 @@ x11_backend_la_SOURCES =                   \
        shared/helpers.h
 endif

-INPUT_BACKEND_LIBS = $(LIBINPUT_BACKEND_LIBS)
+lib_LTLIBRARIES +=                             \
+       libweston-backend.la
+
+libweston_backend_la_CFLAGS = $(AM_CFLAGS) $(LIBDRM_CFLAGS) $(PIXMAN_CFLAGS) $(COMPOSITOR_CFLAGS)
+libweston_backend_la_LIBADD = $(LIBDRM_LIBS) $(LIBINPUT_BACKEND_LIBS) libshared.la
+
 INPUT_BACKEND_SOURCES =                                \
        libweston/libinput-seat.c               \
        libweston/libinput-seat.h               \
@@ -345,16 +329,38 @@ INPUT_BACKEND_SOURCES =                           \
        libweston/libinput-device.h             \
        shared/helpers.h

+SESSION_HELPER_SOURCES =                       \
+       libweston/launcher-util.c               \
+       libweston/launcher-util.h               \
+       libweston/launcher-impl.h               \
+       libweston/weston-launch.h               \
+       libweston/launcher-weston-launch.c      \
+       libweston/launcher-direct.c
+
+if ENABLE_DBUS
+if HAVE_SYSTEMD_LOGIN
+SESSION_HELPER_SOURCES +=                      \
+       libweston/dbus.h                        \
+       libweston/dbus.c                        \
+       libweston/launcher-logind.c
+libweston_backend_la_CFLAGS += $(SYSTEMD_LOGIN_CFLAGS) $(DBUS_CFLAGS)
+libweston_backend_la_LIBADD += $(SYSTEMD_LOGIN_LIBS) $(DBUS_LIBS)
+endif
+endif
+
+libweston_backend_la_SOURCES =                 \
+       $(INPUT_BACKEND_SOURCES)                \
+       $(SESSION_HELPER_SOURCES)
+
 if ENABLE_DRM_COMPOSITOR
 libweston_module_LTLIBRARIES += drm-backend.la
 drm_backend_la_LDFLAGS = -module -avoid-version
 drm_backend_la_LIBADD =                                \
        $(COMPOSITOR_LIBS)                      \
        $(DRM_COMPOSITOR_LIBS)                  \
-       $(INPUT_BACKEND_LIBS)                   \
        libshared.la                            \
        $(CLOCK_GETTIME_LIBS)                   \
-       libsession-helper.la
+       libweston-backend.la
 drm_backend_la_CFLAGS =                                \
        $(COMPOSITOR_CFLAGS)                    \
        $(EGL_CFLAGS)                           \
@@ -416,8 +422,7 @@ fbdev_backend_la_LDFLAGS = -module -avoid-version
 fbdev_backend_la_LIBADD =                      \
        $(COMPOSITOR_LIBS)                      \
        $(FBDEV_COMPOSITOR_LIBS)                \
-       $(INPUT_BACKEND_LIBS)                   \
-       libsession-helper.la                    \
+       libweston-backend.la                    \
        libshared.la
 fbdev_backend_la_CFLAGS =                      \
        $(COMPOSITOR_CFLAGS)                    \
diff --git a/compositor/main.c b/compositor/main.c
index 0e5af5b..a6ab81e 100644
--- a/compositor/main.c
+++ b/compositor/main.c
@@ -1525,7 +1525,6 @@ load_wayland_backend(struct weston_compositor *c,
        return ret;
 }

-
 static int
 load_backend(struct weston_compositor *compositor, const char *backend,
             int *argc, char **argv, struct weston_config *config)
@@ -1542,9 +1541,9 @@ load_backend(struct weston_compositor *compositor, const char *backend,
                return load_x11_backend(compositor, argc, argv, config);
        else if (strstr(backend, "wayland-backend.so"))
                return load_wayland_backend(compositor, argc, argv, config);
-
-       weston_log("Error: unknown backend \"%s\"\n", backend);
-       return -1;
+       else
+               return weston_compositor_load_backend_ext(compositor, backend,
+                                                         argc, argv, config);
 }

 static char *
diff --git a/libweston/compositor.c b/libweston/compositor.c
index 47907bb..685ebbb 100644
--- a/libweston/compositor.c
+++ b/libweston/compositor.c
@@ -5104,6 +5104,22 @@ weston_compositor_load_backend(struct weston_compositor *compositor,
 }

 WL_EXPORT int
+weston_compositor_load_backend_ext(struct weston_compositor *compositor,
+                                  char *name, int *argc, char **argv,
+                                  struct weston_config *wc)
+{
+       int (*backend_init_ext)(struct weston_compositor *c,
+                               int *argc, char **argv,
+                               struct weston_config *wc);
+
+       backend_init_ext = weston_load_module(name, "backend_init_ext");
+       if (!backend_init_ext)
+               return -1;
+
+       return backend_init_ext(compositor, argc, argv, wc);
+}
+
+WL_EXPORT int
 weston_compositor_load_xwayland(struct weston_compositor *compositor)
 {
        int (*module_init)(struct weston_compositor *ec,
diff --git a/libweston/compositor.h b/libweston/compositor.h
index 16db03b..1d94eb3 100644
--- a/libweston/compositor.h
+++ b/libweston/compositor.h
@@ -1568,6 +1568,12 @@ int
 weston_compositor_load_backend(struct weston_compositor *compositor,
                               enum weston_compositor_backend backend,
                               struct weston_backend_config *config_base);
+
+int
+weston_compositor_load_backend_ext(struct weston_compositor *compositor,
+                                  char *name, int *argc, char **argv,
+                                  struct weston_config *wc);
+
 void
 weston_compositor_exit(struct weston_compositor *ec);
 void *
@@ -1765,6 +1771,10 @@ int
 backend_init(struct weston_compositor *c,
             struct weston_backend_config *config_base);
 int
+backend_init_ext(struct weston_compositor *compositor, int *argc, char *argv[],
+                struct weston_config * config);
+
+int
 module_init(struct weston_compositor *compositor,
            int *argc, char *argv[]);

diff --git a/libweston/libinput-seat.c b/libweston/libinput-seat.c
index 78a5fc4..97ca4e2 100644
--- a/libweston/libinput-seat.c
+++ b/libweston/libinput-seat.c
@@ -128,7 +128,7 @@ udev_seat_remove_devices(struct udev_seat *seat)
        }
 }

-void
+WL_EXPORT void
 udev_input_disable(struct udev_input *input)
 {
        if (input->suspended)
@@ -224,7 +224,7 @@ const struct libinput_interface libinput_interface = {
        close_restricted,
 };

-int
+WL_EXPORT  int
 udev_input_enable(struct udev_input *input)
 {
        struct wl_event_loop *loop;
@@ -281,7 +281,7 @@ libinput_log_func(struct libinput *libinput,
        weston_vlog(format, args);
 }

-int
+WL_EXPORT int
 udev_input_init(struct udev_input *input, struct weston_compositor *c,
                struct udev *udev, const char *seat_id,
                udev_configure_device_t configure_device)
@@ -326,7 +326,7 @@ udev_input_init(struct udev_input *input, struct weston_compositor *c,
        return udev_input_enable(input);
 }

-void
+WL_EXPORT void
 udev_input_destroy(struct udev_input *input)
 {
        struct udev_seat *seat, *next;
@@ -403,7 +403,7 @@ udev_seat_destroy(struct udev_seat *seat)
        free(seat);
 }

-struct udev_seat *
+WL_EXPORT struct udev_seat *
 udev_seat_get_named(struct udev_input *input, const char *seat_name)
 {
        struct udev_seat *seat;
diff --git a/libweston/libweston.pc.in b/libweston/libweston.pc.in
index 2391003..30b411a 100644
--- a/libweston/libweston.pc.in
+++ b/libweston/libweston.pc.in
@@ -8,4 +8,4 @@ Description: Header files for libweston compositors development
 Version: @WESTON_VERSION@
 Requires.private: wayland-server pixman-1 xkbcommon
 Cflags: -I${includedir}/libweston- at LIBWESTON_MAJOR@
-Libs: -L${libdir} -lweston- at LIBWESTON_MAJOR@
+Libs: -L${libdir} -lweston- at LIBWESTON_MAJOR@ -lweston-backend
diff --git a/shared/config-parser.c b/shared/config-parser.c
index e2b5fa2..e2b90aa 100644
--- a/shared/config-parser.c
+++ b/shared/config-parser.c
@@ -403,7 +403,7 @@ section_add_entry(struct weston_config_section *section,
        return entry;
 }

-struct weston_config *
+WL_EXPORT struct weston_config *
 weston_config_parse(const char *name)
 {
        FILE *fp;
diff --git a/shared/option-parser.c b/shared/option-parser.c
index eee7546..08c29e7 100644
--- a/shared/option-parser.c
+++ b/shared/option-parser.c
@@ -32,6 +32,8 @@
 #include <assert.h>
 #include <errno.h>

+#include <wayland-util.h>
+
 #include "config-parser.h"
 #include "string-helpers.h"

@@ -135,7 +137,7 @@ short_option_with_arg(const struct weston_option *options, int count, char *arg,
        return 0;
 }

-int
+WL_EXPORT int
 parse_options(const struct weston_option *options,
              int count, int *argc, char *argv[])
 {
--
2.1.4

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