easy comptime hooks

src/App.zig

@@ -1,8 +1,24 @@
 const std = @import("std");
 const nu = @import("nu.zig");
 
+const Bus = @import("nu/Bus.zig");
+const Render = @import("nu/Render.zig");
+const ImGui = @import("nu/ImGui.zig");
+
 pub fn init(alloc: std.mem.Allocator) !void {
     _ = alloc;
 }
 
 pub fn deinit() void {}
+
+pub fn nu_frame() void {}
+
+// pub fn nu_events(events: []const Bus.Event) void {
+//     std.debug.print("{any}\n", .{events});
+// }
+
+// pub fn nu_render_present(_: Render.au.CommandBufferProxy) void {}
+
+pub fn nu_imgui_frame() void {
+    ImGui.igShowMetricsWindow(null);
+}