scene_graph: Maintain wlr_scene_nodes for the sway tree.

include/sway/output.h

@@ -5,6 +5,7 @@
 #include <wayland-server-core.h>
 #include <wlr/types/wlr_damage_ring.h>
 #include <wlr/types/wlr_output.h>
+#include <wlr/types/wlr_scene.h>
 #include "config.h"
 #include "sway/tree/node.h"
 #include "sway/tree/view.h"
@@ -19,7 +20,21 @@ struct sway_output_state {
 
 struct sway_output {
 	struct sway_node node;
+
+	struct {
+		struct wlr_scene_tree *tiling;
+		struct wlr_scene_tree *fullscreen;
+	} layers;
+
+	// when a container is fullscreen, in case the fullscreen surface is
+	// translucent (can see behind) we must make sure that the background is a
+	// solid color in order to conform to the wayland protocol. This rect
+	// ensures that when looking through a surface, all that will be seen
+	// is black.
+	struct wlr_scene_rect *fullscreen_background;
+
 	struct wlr_output *wlr_output;
+	struct wlr_scene_output *scene_output;
 	struct sway_server *server;
 	struct wl_list link;
 

include/sway/tree/container.h

@@ -3,6 +3,7 @@
 #include <stdint.h>
 #include <sys/types.h>
 #include <wlr/types/wlr_compositor.h>
+#include <wlr/types/wlr_scene.h>
 #include "list.h"
 #include "sway/tree/node.h"
 
@@ -68,6 +69,26 @@ struct sway_container {
 	struct sway_node node;
 	struct sway_view *view;
 
+	struct wlr_scene_tree *scene_tree;
+
+	struct {
+		struct wlr_scene_tree *tree;
+
+		struct wlr_scene_tree *border;
+		struct wlr_scene_tree *background;
+	} title_bar;
+
+	struct {
+		struct wlr_scene_tree *tree;
+
+		struct wlr_scene_rect *top;
+		struct wlr_scene_rect *bottom;
+		struct wlr_scene_rect *left;
+		struct wlr_scene_rect *right;
+	} border;
+
+	struct wlr_scene_tree *content_tree;
+
 	struct sway_container_state current;
 	struct sway_container_state pending;
 

include/sway/tree/node.h

@@ -2,6 +2,7 @@
 #define _SWAY_NODE_H
 #include <wayland-server-core.h>
 #include <stdbool.h>
+#include <wlr/types/wlr_scene.h>
 #include "list.h"
 
 #define MIN_SANE_W 100
@@ -75,4 +76,15 @@ list_t *node_get_children(struct sway_node *node);
 
 bool node_has_ancestor(struct sway_node *node, struct sway_node *ancestor);
 
+// when destroying a sway tree, it's not known which order the tree will be
+// destroyed. To prevent freeing of scene_nodes recursing up the tree,
+// let's use this helper function to disown them to the staging node.
+void scene_node_disown_children(struct wlr_scene_tree *tree);
+
+// a helper function used to allocate tree nodes. If an allocation failure
+// occurs a flag is flipped that can be checked later to destroy a parent
+// of this scene node preventing memory leaks.
+struct wlr_scene_tree *alloc_scene_tree(struct wlr_scene_tree *parent,
+		bool *failed);
+
 #endif

include/sway/tree/root.h

@@ -3,6 +3,7 @@
 #include <wayland-server-core.h>
 #include <wayland-util.h>
 #include <wlr/types/wlr_output_layout.h>
+#include <wlr/types/wlr_scene.h>
 #include <wlr/render/wlr_texture.h>
 #include "sway/tree/container.h"
 #include "sway/tree/node.h"
@@ -16,6 +17,31 @@ struct sway_root {
 	struct wlr_output_layout *output_layout;
 
 	struct wl_listener output_layout_change;
+
+	// scene node layout:
+	// - root
+	// 	- staging
+	// 	- layer shell stuff
+	// 	- tiling
+	// 	- floating
+	// 	- fullscreen stuff
+	// 	- seat stuff
+	// 	- ext_session_lock
+	struct wlr_scene *root_scene;
+
+	// since wlr_scene nodes can't be orphaned and must always
+	// have a parent, use this staging scene_tree so that a
+	// node always have a valid parent. Nothing in this
+	// staging node will be visible.
+	struct wlr_scene_tree *staging;
+
+	struct {
+		struct wlr_scene_tree *tiling;
+		struct wlr_scene_tree *floating;
+		struct wlr_scene_tree *fullscreen;
+		struct wlr_scene_tree *fullscreen_global;
+	} layers;
+
 #if HAVE_XWAYLAND
 	struct wl_list xwayland_unmanaged; // sway_xwayland_unmanaged::link
 #endif

include/sway/tree/view.h

@@ -2,6 +2,7 @@
 #define _SWAY_VIEW_H
 #include <wayland-server-core.h>
 #include <wlr/types/wlr_compositor.h>
+#include <wlr/types/wlr_scene.h>
 #include "sway/config.h"
 #if HAVE_XWAYLAND
 #include <wlr/xwayland.h>
@@ -69,6 +70,9 @@ struct sway_view {
 	enum sway_view_type type;
 	const struct sway_view_impl *impl;
 
+	struct wlr_scene_tree *scene_tree;
+	struct wlr_scene_tree *content_tree;
+
 	struct sway_container *container; // NULL if unmapped and transactions finished
 	struct wlr_surface *surface; // NULL for unmapped views
 	struct sway_xdg_decoration *xdg_decoration;

include/sway/tree/workspace.h

@@ -2,6 +2,7 @@
 #define _SWAY_WORKSPACE_H
 
 #include <stdbool.h>
+#include <wlr/types/wlr_scene.h>
 #include "sway/config.h"
 #include "sway/tree/container.h"
 #include "sway/tree/node.h"
@@ -23,6 +24,12 @@ struct sway_workspace_state {
 
 struct sway_workspace {
 	struct sway_node node;
+
+	struct {
+		struct wlr_scene_tree *tiling;
+		struct wlr_scene_tree *fullscreen;
+	} layers;
+
 	struct sway_container *fullscreen;
 
 	char *name;