starting of root module refactor

src/root.zig

@@ -0,0 +1,71 @@
+const std = @import("std");
+
+const wl = @import("wayland").server.wl;
+const wlr = @import("wlroots");
+
+const Output = @import("output.zig").Output;
+
+const server = &@import("main.zig").server;
+
+pub const Root = struct {
+  scene: *wlr.Scene,
+
+  output_layout: *wlr.OutputLayout,
+
+  new_output: wl.Listener(*wlr.Output),
+
+  pub fn init(root: *Root) !void {
+    std.log.info("Creating root of mezzaluna", .{});
+
+    const output_layout = try wlr.OutputLayout.create(server.wl_server);
+    errdefer output_layout.destroy();
+
+    const scene = try wlr.Scene.create();
+    errdefer scene.tree.node.destroy();
+
+    root.* = .{
+      .scene = scene,
+      .output_layout = output_layout,
+
+      .new_output = .init(handleNewOutput),
+    };
+
+    server.backend.events.new_output.add(&root.new_output);
+  }
+
+  pub fn addOutput(self: *Root, new_output: *Output) void {
+    _ = self.output_layout.addAuto(new_output.wlr_output) catch {
+      std.log.err("failed to add new output to output layout\n", .{});
+      return;
+    };
+
+    _ = self.scene.createSceneOutput(new_output.wlr_output) catch {
+      std.log.err("failed to create scene output for new output", .{});
+      return;
+    };
+  }
+};
+
+fn handleNewOutput(_: *wl.Listener(*wlr.Output), wlr_output: *wlr.Output) void {
+  std.log.info("Handling a new output - {s}", .{wlr_output.name});
+
+  if (!wlr_output.initRender(server.allocator, server.renderer)) return;
+
+  var state = wlr.Output.State.init();
+  defer state.finish();
+
+  state.setEnabled(true);
+
+  if (wlr_output.preferredMode()) |mode| {
+    state.setMode(mode);
+  }
+  if (!wlr_output.commitState(&state)) return;
+
+  const new_output = Output.create(wlr_output) catch {
+    std.log.err("failed to allocate new output", .{});
+    wlr_output.destroy();
+    return;
+  };
+
+  server.root.addOutput(new_output);
+}