runtime hooks

src/nu/Render.zig

@@ -9,6 +9,8 @@ const vk = @import("vk");
 const nu = @import("../nu.zig");
 const au = @import("Render/au.zig");
 
+const Hook = @import("hooks.zig").Hook;
+
 pub const Options = struct {
     app_name: [*:0]const u8 = "nu-au-app",
     app_version: struct {
@@ -27,6 +29,14 @@ pub const Options = struct {
     frames_in_flight: u8 = 3,
 };
 
+pub const Hooks = struct {
+    pub const Present = Hook(fn (au.CommandBufferProxy) void);
+
+    present: Present,
+};
+
+pub var hooks: Hooks = undefined;
+
 var sc: au.SwapChain = undefined;
 var flights: au.Flights = undefined;
 
@@ -40,6 +50,21 @@ pub fn init(alloc: std.mem.Allocator) !void {
 
     flights = try au.Flights.init(alloc, nu.options.render.frames_in_flight);
     errdefer flights.deinit();
+
+    hooks = .{ .present = Hooks.Present.init(alloc) };
+    errdefer hooks.present.deinit();
+}
+
+pub fn deinit() void {
+    hooks.present.deinit();
+    flights.deinit();
+    sc.deinit();
+    au.deinit();
+}
+
+pub fn connect() !void {
+    try nu.hooks.frame.register(nu_frame);
+    try nu.hooks.close.register(nu_close);
 }
 
 pub fn nu_frame() !void {
@@ -70,7 +95,7 @@ pub fn nu_frame() !void {
 
         // todo manage frame in flight state for each hook; pass the current flight in as context.
         // will need some comptime -> anytype mapping.
-        try nu.invoke_hook("nu_render_present", .{cmd});
+        hooks.present.invoke(.{cmd});
 
         target.end_rendering(cmd);
         try cmd.endCommandBuffer();
@@ -102,12 +127,8 @@ pub fn nu_frame() !void {
     }
 }
 
-pub fn nu_close() !void {
-    try au.D.deviceWaitIdle();
-}
-
-pub fn deinit() void {
-    flights.deinit();
-    sc.deinit();
-    au.deinit();
+pub fn nu_close() void {
+    au.D.deviceWaitIdle() catch |err| {
+        std.debug.panic("Device wait failed: {!}", .{err});
+    };
 }