well-behaved swapchain

src/nu/Window.zig

@@ -54,6 +54,8 @@ pub fn setup(_: std.mem.Allocator) !void {
         null,
     ) orelse std.debug.panic("GLFW Create Window Failed", .{});
 
+    _ = c.glfwSetFramebufferSizeCallback(handle, &resize_callback);
+
     // bus.connect(handle);
     // errdefer bus.disconnect(handle);
 }
@@ -75,3 +77,19 @@ pub fn next() bool {
 
     return true;
 }
+
+var _resize_callbacks: std.BoundedArray(*const fn (u32, u32) void, 16) = .{};
+
+fn resize_callback(_: ?*c.GLFWwindow, w: c_int, h: c_int) callconv(.C) void {
+    for (_resize_callbacks.slice()) |cb| {
+        cb(@intCast(w), @intCast(h));
+    }
+}
+
+pub fn add_resize_callback(cb: *const fn (u32, u32) void) void {
+    _resize_callbacks.appendAssumeCapacity(cb);
+}
+
+pub fn set_title(title: [:0]const u8) void {
+    c.glfwSetWindowTitle(handle, title);
+}