Rework Server

include/render.c

@@ -2,19 +2,14 @@
 #include <wlr/backend.h>
 #include <wlr/render/wlr_renderer.h>
 
-struct wlr_backend *zag_wlr_backend_autocreate(struct wl_display *display) {
+struct wlr_backend *wlr_backend_autocreate(struct wl_display *display) {
     return wlr_backend_autocreate(display, NULL);
 }
 
-struct wlr_renderer *zag_wlr_backend_get_renderer(struct wlr_backend *backend) {
+struct wlr_renderer *wlr_backend_get_renderer(struct wlr_backend *backend) {
     return wlr_backend_get_renderer(backend);
 }
 
-bool zag_wlr_backend_start(struct wlr_backend *backend) {
+bool wlr_backend_start(struct wlr_backend *backend) {
     return wlr_backend_start(backend);
 }
-
-void zag_wlr_backend_destroy(struct wlr_backend *backend) {
-    zag_wlr_backend_destroy(backend);
-}
-

include/render.h

@@ -18,10 +18,9 @@ struct wlr_backend {
 	} events;
 };
 
-struct wlr_backend *zag_wlr_backend_autocreate(struct wl_display *display);
+struct wlr_backend *wlr_backend_autocreate(struct wl_display *display);
-struct wlr_renderer *zag_wlr_backend_get_renderer(struct wlr_backend *backend);
+struct wlr_renderer *wlr_backend_get_renderer(struct wlr_backend *backend);
-bool zag_wlr_backend_start(struct wlr_backend *backend);
+bool wlr_backend_start(struct wlr_backend *backend);
-void zag_wlr_backend_destroy(struct wlr_backend *backend);
 
 
 #endif

src/main.zig

@@ -1,31 +1,13 @@
 const std = @import("std");
 const c = @import("c.zig").c;
-const man_c = @import("c.zig").manual;
-
-const ZagError = error{
-    InitError,
-    CantAddSocket,
-    CantStartBackend,
-    CantSetEnv,
-};
 
 pub fn main() !void {
     std.debug.warn("Starting up.\n", .{});
 
     c.wlr_log_init(c.enum_wlr_log_importance.WLR_DEBUG, null);
 
-    var server: Server = undefined;
+    var server = try Server.init(std.heap.c_allocator);
-
+    defer server.deinit();
-    // Creates an output layout, which a wlroots utility for working with an
-    // arrangement of screens in a physical layout.
-    server.output_layout = c.wlr_output_layout_create();
-
-    server.outputs = std.ArrayList(Output).init(std.heap.c_allocator);
-
-    // Configure a listener to be notified when new outputs are available on the
-    // backend.
-    server.new_output.notify = server_new_output;
-    c.wl_signal_add(&server.backend.*.events.new_output, &server.new_output);
 
     // Set up our list of views and the xdg-shell. The xdg-shell is a Wayland
     // protocol which is used for application windows.
@@ -35,39 +17,13 @@ pub fn main() !void {
     server.new_xdg_surface.notify = server_new_xdg_surface;
     c.wl_signal_add(&server.xdg_shell.*.events.new_surface, &server.new_xdg_surface);
 
-    // Add a Unix socket to the Wayland display.
+    try server.start();
-    const socket = c.wl_display_add_socket_auto(server.wl_display);
-    if (socket == null) {
-        c.zag_wlr_backend_destroy(server.backend);
-        return ZagError.CantAddSocket;
-    }
 
-    // Start the backend. This will enumerate outputs and inputs, become the DRM
+    // Spawn an instance of alacritty
-    // master, etc
+    // const argv = [_][]const u8{ "/bin/sh", "-c", "WAYLAND_DEBUG=1 alacritty" };
-    if (!c.zag_wlr_backend_start(server.backend)) {
+    const argv = [_][]const u8{ "/bin/sh", "-c", "alacritty" };
-        c.zag_wlr_backend_destroy(server.backend);
-        c.wl_display_destroy(server.wl_display);
-        return ZagError.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 ZagError.CantSetEnv;
-    }
-
-    const argv = [_][]const u8{ "/bin/sh", "-c", "WAYLAND_DEBUG=1 alacritty" };
     var child = try std.ChildProcess.init(&argv, std.heap.c_allocator);
     try std.ChildProcess.spawn(child);
 
-    // Run the Wayland event loop. This does not return until you exit the
+    server.run();
-    // compositor. Starting the backend rigged up all of the necessary event
-    // loop configuration to listen to libinput events, DRM events, generate
-    // frame events at the refresh rate, and so on.
-    //c.wlr_log(WLR_INFO, "Running Wayland compositor on WAYLAND_DISPLAY=%s", socket);
-    c.wl_display_run(server.wl_display);
-
-    // Once wl_display_run returns, we shut down the server.
-    c.wl_display_destroy_clients(server.wl_display);
-    c.wl_display_destroy(server.wl_display);
 }

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,
+    wlr_backend: *c.wlr_backend,
-    renderer: *c.wlr_renderer,
+    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
+        // The wlr_backend abstracts the input/output hardware. Autocreate chooses
-        // output hardware. The autocreate option will choose the most suitable
+        // the best option based on the environment, for example DRM when run from
-        // backend based on the current environment, such as opening an X11 window
+        // a tty or wayland if WAYLAND_DISPLAY is set.
-        // 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
+        // This frees itself when the wl_display is destroyed.
-        // backend uses the renderer, for example, to fall back to software cursors
+        server.wlr_backend = c.wlr_backend_autocreate(server.wl_display) orelse
-        // if the backend does not support hardware cursors (some older GPUs
+            return error.CantCreateWlrBackend;
-        // don't).
-        server.backend = c.zag_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;
+        server.wlr_renderer = c.wlr_backend_get_renderer(server.backend) orelse
-        c.wlr_renderer_init_wl_display(server.renderer, server.wl_display) orelse return error.CantInitWlDisplay;
+            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
+        // These both free themselves when the wl_display is destroyed
-        // necessary for clients to allocate surfaces and the data device manager
+        _ = c.wlr_compositor_create(server.wl_display, server.renderer) orelse
-        // handles the clipboard. Each of these wlroots interfaces has room for you
+            return error.CantCreateWlrCompositor;
-        // to dig your fingers in and play with their behavior if you want.
+        _ = c.wlr_data_device_manager_create(server.wl_display) orelse
-        _ = c.wlr_compositor_create(server.wl_display, server.renderer) orelse return error.CantCreateWlrCompositor;
+            return error.CantCreateWlrDataDeviceManager;
-        _ = 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;
     }
-
 };