weston-info: Add support for zwp_linux_dmabuf_v1

This now prints each (format, modifier) tuple, to show which ones the
compositor sends to its clients.  It is only implemented for version 3+,
since I didn’t have any compositor implementing previous versions, and
the old `format` event is deprecated anyway.

Signed-off-by: Emmanuel Gil Peyrot <emmanuel.peyrot@collabora.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>

Makefile.am

@@ -835,7 +835,9 @@ weston_info_SOURCES = 					\
 	shared/helpers.h
 nodist_weston_info_SOURCES =				\
 	protocol/presentation-time-protocol.c		\
-	protocol/presentation-time-client-protocol.h
+	protocol/presentation-time-client-protocol.h	\
+	protocol/linux-dmabuf-unstable-v1-protocol.c	\
+	protocol/linux-dmabuf-unstable-v1-client-protocol.h
 weston_info_LDADD = $(WESTON_INFO_LIBS) libshared.la
 weston_info_CFLAGS = $(AM_CFLAGS) $(CLIENT_CFLAGS)
 

clients/weston-info.c

@@ -40,6 +40,7 @@
 #include "shared/xalloc.h"
 #include "shared/zalloc.h"
 #include "presentation-time-client-protocol.h"
+#include "linux-dmabuf-unstable-v1-client-protocol.h"
 
 typedef void (*print_info_t)(void *info);
 typedef void (*destroy_info_t)(void *info);
@@ -96,6 +97,20 @@ struct shm_info {
 	struct wl_list formats;
 };
 
+struct linux_dmabuf_modifier {
+	struct wl_list link;
+
+	uint32_t format;
+	uint64_t modifier;
+};
+
+struct linux_dmabuf_info {
+	struct global_info global;
+	struct zwp_linux_dmabuf_v1 *dmabuf;
+
+	struct wl_list modifiers;
+};
+
 struct seat_info {
 	struct global_info global;
 	struct wl_seat *seat;
@@ -296,6 +311,25 @@ print_shm_info(void *data)
 	printf("\n");
 }
 
+static void
+print_linux_dmabuf_info(void *data)
+{
+	char str[5];
+	struct linux_dmabuf_info *dmabuf = data;
+	struct linux_dmabuf_modifier *modifier;
+
+	print_global_info(data);
+
+	printf("\tformats:");
+
+	wl_list_for_each(modifier, &dmabuf->modifiers, link) {
+		fourcc2str(modifier->format, str, sizeof(str));
+		printf("\n\t'%s'(0x%08x), modifier: 0x%016"PRIx64, str, modifier->format, modifier->modifier);
+	}
+
+	printf("\n");
+}
+
 static void
 print_seat_info(void *data)
 {
@@ -491,6 +525,62 @@ add_shm_info(struct weston_info *info, uint32_t id, uint32_t version)
 	info->roundtrip_needed = true;
 }
 
+static void
+linux_dmabuf_handle_format(void *data, struct zwp_linux_dmabuf_v1 *zwp_linux_dmabuf_v1, uint32_t format)
+{
+	/* This is a deprecated event, don’t use it. */
+}
+
+static void
+linux_dmabuf_handle_modifier(void *data, struct zwp_linux_dmabuf_v1 *zwp_linux_dmabuf_v1, uint32_t format, uint32_t modifier_hi, uint32_t modifier_lo)
+{
+	struct linux_dmabuf_info *dmabuf = data;
+	struct linux_dmabuf_modifier *linux_dmabuf_modifier = xzalloc(sizeof *linux_dmabuf_modifier);
+
+	wl_list_insert(&dmabuf->modifiers, &linux_dmabuf_modifier->link);
+	linux_dmabuf_modifier->format = format;
+	linux_dmabuf_modifier->modifier = ((uint64_t)modifier_hi) << 32 | modifier_lo;
+}
+
+static const struct zwp_linux_dmabuf_v1_listener linux_dmabuf_listener = {
+	linux_dmabuf_handle_format,
+	linux_dmabuf_handle_modifier,
+};
+
+static void
+destroy_linux_dmabuf_info(void *data)
+{
+	struct linux_dmabuf_info *dmabuf = data;
+	struct linux_dmabuf_modifier *modifier, *tmp;
+
+	wl_list_for_each_safe(modifier, tmp, &dmabuf->modifiers, link) {
+		wl_list_remove(&modifier->link);
+		free(modifier);
+	}
+
+	zwp_linux_dmabuf_v1_destroy(dmabuf->dmabuf);
+}
+
+static void
+add_linux_dmabuf_info(struct weston_info *info, uint32_t id, uint32_t version)
+{
+	struct linux_dmabuf_info *dmabuf = xzalloc(sizeof *dmabuf);
+
+	init_global_info(info, &dmabuf->global, id, "zwp_linux_dmabuf_v1", version);
+	dmabuf->global.print = print_linux_dmabuf_info;
+	dmabuf->global.destroy = destroy_linux_dmabuf_info;
+
+	wl_list_init(&dmabuf->modifiers);
+
+	if (version >= 3) {
+		dmabuf->dmabuf = wl_registry_bind(info->registry,
+		                                  id, &zwp_linux_dmabuf_v1_interface, 3);
+		zwp_linux_dmabuf_v1_add_listener(dmabuf->dmabuf, &linux_dmabuf_listener, dmabuf);
+
+		info->roundtrip_needed = true;
+	}
+}
+
 static void
 output_handle_geometry(void *data, struct wl_output *wl_output,
 		       int32_t x, int32_t y,
@@ -688,6 +778,8 @@ global_handler(void *data, struct wl_registry *registry, uint32_t id,
 		add_seat_info(info, id, version);
 	else if (!strcmp(interface, "wl_shm"))
 		add_shm_info(info, id, version);
+	else if (!strcmp(interface, "zwp_linux_dmabuf_v1"))
+		add_linux_dmabuf_info(info, id, version);
 	else if (!strcmp(interface, "wl_output"))
 		add_output_info(info, id, version);
 	else if (!strcmp(interface, wp_presentation_interface.name))