Rework Server

src/server.zig

@@ -3,45 +3,92 @@ const c = @import("c.zig").c;
 
 pub const Server = struct {
     wl_display: *c.wl_display,
-    backend: *c.wlr_backend,
-    renderer: *c.wlr_renderer,
+    wlr_backend: *c.wlr_backend,
+    wlr_renderer: *c.wlr_renderer,
+
+    wlr_output_layout: *c.wlr_output_layout,
+    outputs: std.ArrayList(Output),
+
+    listen_new_output: c.wl_listener,
+
     xdg_shell: *c.wlr_xdg_shell,
     new_xdg_surface: c.wl_listener,
     views: std.ArrayList(View),
 
-    output_layout: *c.wlr_output_layout,
-    outputs: std.ArrayList(Output),
-    new_output: c.wl_listener,
-
     pub fn init(allocator: *std.mem.Allocator) !@This() {
-        var server: @This() = undefined;
+        var server = undefined;
 
         // The Wayland display is managed by libwayland. It handles accepting
         // clients from the Unix socket, manging Wayland globals, and so on.
-        server.wl_display = c.wl_display_create() orelse return error.CantCreateWlDisplay;
+        server.wl_display = c.wl_display_create() orelse
+            return error.CantCreateWlDisplay;
+        errdefer c.wl_display_destroy(server.wl_display);
 
-        // The backend is a wlroots feature which abstracts the underlying input and
-        // output hardware. The autocreate option will choose the most suitable
-        // backend based on the current environment, such as opening an X11 window
-        // if an X11 server is running. The NULL argument here optionally allows you
-        // to pass in a custom renderer if wlr_renderer doesn't meet your needs. The
-        // backend uses the renderer, for example, to fall back to software cursors
-        // if the backend does not support hardware cursors (some older GPUs
-        // don't).
-        server.backend = c.zag_wlr_backend_autocreate(server.wl_display) orelse return error.CantCreateWlrBackend;
+        // The wlr_backend abstracts the input/output hardware. Autocreate chooses
+        // the best option based on the environment, for example DRM when run from
+        // a tty or wayland if WAYLAND_DISPLAY is set.
+        //
+        // This frees itself when the wl_display is destroyed.
+        server.wlr_backend = c.wlr_backend_autocreate(server.wl_display) orelse
+            return error.CantCreateWlrBackend;
 
         // If we don't provide a renderer, autocreate makes a GLES2 renderer for us.
         // The renderer is responsible for defining the various pixel formats it
         // supports for shared memory, this configures that for clients.
-        server.renderer = c.zag_wlr_backend_get_renderer(server.backend) orelse return error.CantGetWlrRenderer;
-        c.wlr_renderer_init_wl_display(server.renderer, server.wl_display) orelse return error.CantInitWlDisplay;
+        server.wlr_renderer = c.wlr_backend_get_renderer(server.backend) orelse
+            return error.CantGetWlrRenderer;
+        c.wlr_renderer_init_wl_display(server.wlr_renderer, server.wl_display) orelse
+            return error.CantInitWlDisplay;
 
-        // This creates some hands-off wlroots interfaces. The compositor is
-        // necessary for clients to allocate surfaces and the data device manager
-        // handles the clipboard. Each of these wlroots interfaces has room for you
-        // to dig your fingers in and play with their behavior if you want.
-        _ = c.wlr_compositor_create(server.wl_display, server.renderer) orelse return error.CantCreateWlrCompositor;
-        _ = c.wlr_data_device_manager_create(server.wl_display) orelse return error.CantCreateWlrDataDeviceManager;
+        // These both free themselves when the wl_display is destroyed
+        _ = c.wlr_compositor_create(server.wl_display, server.renderer) orelse
+            return error.CantCreateWlrCompositor;
+        _ = c.wlr_data_device_manager_create(server.wl_display) orelse
+            return error.CantCreateWlrDataDeviceManager;
+
+        // Create an output layout, which a wlroots utility for working with an
+        // arrangement of screens in a physical layout.
+        server.wlr_output_layout = c.wlr_output_layout_create() orelse
+            return error.CantCreateWlrOutputLayout;
+        errdefer c.wlr_output_layout_destroy(server.wlr_output_layout);
+
+        server.outputs = std.ArrayList(Output).init(std.heap.c_allocator);
+
+        // Setup a listener for new outputs
+        server.listen_new_output = handle_new_output;
+        c.wl_signal_add(&server.wlr_backend.*.events.new_output, &server.listen_new_output);
+    }
+
+    /// Free allocated memory and clean up
+    pub fn deinit(self: @This()) void {
+        c.wl_display_destroy_clients(self.wl_display);
+        c.wl_display_destroy(self.wl_display);
+        c.wlr_output_layout_destroy(self.wlr_output_layout);
+    }
+
+    /// Create the socket, set WAYLAND_DISPLAY, and start the backend
+    pub fn start(self: @This()) !void {
+        // Add a Unix socket to the Wayland display.
+        const socket = c.wl_display_add_socket_auto(self.wl_display) orelse;
+            return error.CantAddSocket;
+
+        // Start the backend. This will enumerate outputs and inputs, become the DRM
+        // master, etc
+        if (!c.wlr_backend_start(self.wlr_backend)) {
+            c.wlr_backend_destroy(self.wlr_backend);
+            return error.CantStartBackend;
+        }
+
+        // Set the WAYLAND_DISPLAY environment variable to our socket and run the
+        // startup command if requested. */
+        if (c.setenv("WAYLAND_DISPLAY", socket, 1) == -1) {
+            return error.CantSetEnv;
+        }
+    }
+
+    /// Enter the wayland event loop and block until the compositor is exited
+    pub fn run(self: @This()) void {
+        c.wl_display_run(server.wl_display);
     }
 
     pub fn handle_keybinding(self: *@This(), sym: c.xkb_keysym_t) bool {
@@ -67,5 +114,4 @@ pub const Server = struct {
         }
         return true;
     }
-
 };