Handle multiple clients better.

client.c

@@ -112,7 +112,7 @@ int main(int argc, char *argv[])
 {
 	struct wl_display *display;
 	struct wl_surface *surface;
-	const int x = 200, y = 100, width = 300, height = 300;
+	const int x = 200, y = 200, width = 200, height = 200;
 	int fd, i, ret;
 	uint32_t name, mask;
 	cairo_surface_t *s;
@@ -141,11 +141,11 @@ int main(int argc, char *argv[])
 			  cairo_image_surface_get_stride(s));
 
 	i = 0;
-	while (ret = poll(p, 1, 20), ret >= 0) {
+	while (ret = poll(p, 1, 200), ret >= 0) {
 		if (ret == 0) {
 			wl_surface_map(surface, 
-				       x + cos(i / 10.0) * 50,
-				       y + sin(i / 10.0) * 50,
+				       x + cos(i / 10.0) * 150,
+				       y + sin(i / 10.0) * 150,
 				       width, height);
 			i++;
 			continue;

egl-compositor.c

@@ -21,6 +21,7 @@ struct egl_compositor {
 	EGLDisplay display;
 	EGLSurface surface;
 	EGLContext context;
+	struct wl_display *wl_display;
 	int gem_fd;
 };
 
@@ -28,6 +29,7 @@ struct surface_data {
 	uint32_t handle;
 	int32_t width, height, stride;
 	GLuint texture;
+	struct wl_map map;
 };
 
 void notify_surface_create(struct wl_compositor *compositor,
@@ -134,34 +136,44 @@ void notify_surface_attach(struct wl_compositor *compositor,
 	free(data);
 }
 
-void notify_surface_map(struct wl_compositor *compositor,
-			struct wl_surface *surface, struct wl_map *map)
+static void
+repaint(struct egl_compositor *ec)
 {
-	struct egl_compositor *ec = (struct egl_compositor *) compositor;
+	struct wl_surface_iterator *iterator;
+	struct wl_surface *surface;
 	struct surface_data *sd;
-	GLint vertices[12] = {
-		map->x, map->y, 0.0,
-		map->x, map->y + map->height, 0.0,
-		map->x + map->width, map->y + map->height, 0.0,
-		map->x + map->width, map->y, 0.0
-	};
-	GLint tex_coords[8] = {
-		1, 0,
-		1, 1,
-		0, 1,
-		0, 0
-	};
+	GLint vertices[12];
+	GLint tex_coords[8] = { 1, 0,  1, 1,  0, 1,  0, 0 };
 	GLuint indices[4] = { 0, 1, 2, 3 };
 	       
 	/* This part is where we actually copy the buffer to screen.
-	 * Needs to be part of the repaint loop, not in the notify_map
-	 * handler. */
+	 * Needs to be part of the repaint loop, not called from the
+	 * notify_map handler. */
 
+	glClear(GL_COLOR_BUFFER_BIT); 
+
+	iterator = wl_surface_iterator_create(ec->wl_display, 0);
+	while (wl_surface_iterator_next(iterator, &surface)) {
 		sd = wl_surface_get_data(surface);
 		if (sd == NULL)
-		return;
+			continue;
+
+		vertices[0] = sd->map.x;
+		vertices[1] = sd->map.y;
+		vertices[2] = 0;
+
+		vertices[3] = sd->map.x;
+		vertices[4] = sd->map.y + sd->map.height;
+		vertices[5] = 0;
+
+		vertices[6] = sd->map.x + sd->map.width;
+		vertices[7] = sd->map.y + sd->map.height;
+		vertices[8] = 0;
+
+		vertices[9] = sd->map.x + sd->map.width;
+		vertices[10] = sd->map.y;
+		vertices[11] = 0;
 
-	glClear(GL_COLOR_BUFFER_BIT); 
 		glBindTexture(GL_TEXTURE_2D, sd->texture);
 		glEnable(GL_TEXTURE_2D);
 		glEnable(GL_BLEND);
@@ -172,12 +184,28 @@ void notify_surface_map(struct wl_compositor *compositor,
 		glVertexPointer(3, GL_INT, 0, vertices);
 		glTexCoordPointer(2, GL_INT, 0, tex_coords);
 		glDrawElements(GL_QUADS, 4, GL_UNSIGNED_INT, indices);
+	}
+	wl_surface_iterator_destroy(iterator);
 
 	glFlush();
 
 	eglSwapBuffers(ec->display, ec->surface);
 }
 
+void notify_surface_map(struct wl_compositor *compositor,
+			struct wl_surface *surface, struct wl_map *map)
+{
+	struct egl_compositor *ec = (struct egl_compositor *) compositor;
+	struct surface_data *sd;
+
+	sd = wl_surface_get_data(surface);
+	if (sd == NULL)
+		return;
+
+	sd->map = *map;
+	repaint(ec);
+}
+
 struct wl_compositor_interface interface = {
 	notify_surface_create,
 	notify_surface_destroy,
@@ -188,7 +216,7 @@ struct wl_compositor_interface interface = {
 static const char gem_device[] = "/dev/dri/card0";
 
 struct wl_compositor *
-wl_compositor_create(void)
+wl_compositor_create(struct wl_display *display)
 {
 	EGLConfig configs[64];
 	EGLint major, minor, count;
@@ -200,6 +228,7 @@ wl_compositor_create(void)
 		return NULL;
 
 	ec->base.interface = &interface;
+	ec->wl_display = display;
 
 	ec->display = eglCreateDisplay(gem_device, "i965");
 	if (ec->display == NULL) {

wayland-client.c

@@ -51,7 +51,6 @@ wl_display_create(const char *address,
 		return NULL;
 
 	memset(display, 0, sizeof *display);
-	display->id = 256; /* Need to get our id-range. */
 	display->fd = socket(PF_LOCAL, SOCK_STREAM, 0);
 	if (display->fd < 0) {
 		free(display);
@@ -69,6 +68,10 @@ wl_display_create(const char *address,
 		return NULL;
 	}
 
+	/* FIXME: We'll need a protocol for getting a new range, I
+	 * guess... */
+	read(display->fd, &display->id, sizeof display->id);
+
 	/* FIXME: actually discover advertised objects here. */
 	read(display->fd, &id, sizeof id);
 	read(display->fd, &length, sizeof length);

wayland.c

@@ -14,9 +14,33 @@
 
 #define ARRAY_LENGTH(a) (sizeof (a) / sizeof (a)[0])
 
-struct wl_region {
+struct wl_list {
+	struct wl_list *prev;
+	struct wl_list *next;
 };
 
+void wl_list_init(struct wl_list *list)
+{
+	list->prev = list;
+	list->next = list;
+}
+
+void
+wl_list_insert(struct wl_list *list, struct wl_list *elm)
+{
+	elm->prev = list;
+	elm->next = list->next;
+	list->next = elm;
+	elm->next->prev = elm;
+}
+
+void
+wl_list_remove(struct wl_list *elm)
+{
+	elm->prev->next = elm->next;
+	elm->next->prev = elm->prev;
+}
+
 struct wl_client {
 	struct wl_connection *connection;
 	struct wl_event_source *source;
@@ -30,6 +54,9 @@ struct wl_display {
 
 	struct wl_compositor *compositor;
 	struct wl_compositor_interface *compositor_interface;
+
+	struct wl_list surface_list;
+	uint32_t client_id_range;
 };
 
 struct wl_surface {
@@ -41,6 +68,7 @@ struct wl_surface {
 	int stride;
 	
 	struct wl_map map;
+	struct wl_list link;
 
 	/* how to convert buffer contents to pixels in screen format;
 	 * yuv->rgb, indexed->rgb, svg->rgb, but mostly just rgb->rgb. */
@@ -58,7 +86,9 @@ wl_surface_destroy(struct wl_client *client,
 	struct wl_compositor_interface *interface;
 
 	interface = client->display->compositor->interface;
-	interface->notify_surface_destroy(client->display->compositor, surface);
+	interface->notify_surface_destroy(client->display->compositor,
+					  surface);
+	wl_list_remove(&surface->link);
 }
 
 static void
@@ -134,6 +164,8 @@ wl_surface_create(struct wl_display *display, uint32_t id)
 	surface->base.id = id;
 	surface->base.interface = &surface_interface;
 
+	wl_list_insert(display->surface_list.prev, &surface->link);
+
 	interface = display->compositor->interface;
 	interface->notify_surface_create(display->compositor, surface);
 
@@ -238,11 +270,8 @@ wl_client_demarshal(struct wl_client *client, struct wl_object *target,
 static void
 wl_client_event(struct wl_client *client, struct wl_object *object, uint32_t event)
 {
-	const struct wl_interface *interface;
 	uint32_t p[2];
 
-	interface = object->interface;
-
 	p[0] = object->id;
 	p[1] = event | (8 << 16);
 	wl_connection_write(client->connection, p, sizeof p);
@@ -355,6 +384,11 @@ wl_client_create(struct wl_display *display, int fd)
 						  wl_client_connection_update, 
 						  client);
 
+	wl_connection_write(client->connection,
+			    &display->client_id_range,
+			    sizeof display->client_id_range);
+	display->client_id_range += 256;
+
 	advertise_object(client, &display->base);
 
 	return client;
@@ -421,6 +455,9 @@ wl_display_create(void)
 	display->base.id = 0;
 	display->base.interface = &display_interface;
 	wl_hash_insert(&display->objects, &display->base);
+	wl_list_init(&display->surface_list);
+
+	display->client_id_range = 256; /* Gah, arbitrary... */
 
 	return display;		
 }
@@ -489,6 +526,53 @@ wl_display_add_socket(struct wl_display *display)
 }
 
 
+#define container_of(ptr, type, member) ({			\
+	const typeof( ((type *)0)->member ) *__mptr = (ptr);	\
+	(type *)( (char *)__mptr - offsetof(type,member) );})
+
+struct wl_surface_iterator {
+	struct wl_list *head;
+	struct wl_surface *surface;
+	uint32_t mask;
+};
+
+struct wl_surface_iterator *
+wl_surface_iterator_create(struct wl_display *display, uint32_t mask)
+{
+	struct wl_surface_iterator *iterator;
+
+	iterator = malloc(sizeof *iterator);
+	if (iterator == NULL)
+		return NULL;
+
+	iterator->head = &display->surface_list;
+	iterator->surface = container_of(display->surface_list.next,
+					 struct wl_surface, link);
+	iterator->mask = mask;
+
+	return iterator;
+}
+
+int
+wl_surface_iterator_next(struct wl_surface_iterator *iterator,
+			 struct wl_surface **surface)
+{
+	if (&iterator->surface->link == iterator->head)
+		return 0;
+
+	*surface = iterator->surface;
+	iterator->surface = container_of(iterator->surface->link.next,
+					 struct wl_surface, link);
+
+	return 1;
+}
+
+void
+wl_surface_iterator_destroy(struct wl_surface_iterator *iterator)
+{
+	free(iterator);
+}
+
 int main(int argc, char *argv[])
 {
 	struct wl_display *display;
@@ -501,7 +585,7 @@ int main(int argc, char *argv[])
 		exit(EXIT_FAILURE);
 	}
 
-	compositor = wl_compositor_create();
+	compositor = wl_compositor_create(display);
 	wl_display_set_compositor(display, compositor);
 
 	printf("wayland online, display is %p\n", display);

wayland.h

@@ -84,6 +84,13 @@ struct wl_map {
 void wl_surface_set_data(struct wl_surface *surface, void *data);
 void *wl_surface_get_data(struct wl_surface *surface);
 
+struct wl_surface_iterator;
+struct wl_surface_iterator *
+wl_surface_iterator_create(struct wl_display *display, uint32_t mask);
+int wl_surface_iterator_next(struct wl_surface_iterator *iterator,
+			     struct wl_surface **surface);
+void wl_surface_iterator_destroy(struct wl_surface_iterator *iterator);
+
 struct wl_compositor {
 	struct wl_compositor_interface *interface;
 };
@@ -100,7 +107,7 @@ struct wl_compositor_interface {
 				   struct wl_surface *surface, struct wl_map *map);
 };
 
-struct wl_compositor *wl_compositor_create(void);
+struct wl_compositor *wl_compositor_create(struct wl_display *display);
 
 void wl_display_set_compositor(struct wl_display *display,
 			       struct wl_compositor *compositor);