Label Widget inside horizon

sysdata/programs/horizon/src/main.hb

@@ -4,9 +4,35 @@ stn := @use("../../../libraries/stn/src/lib.hb");
 
 horizon_api := @use("../../../libraries/horizon_api/src/lib.hb")
 
-render := @use("../../../libraries/render/src/lib.hb")
+render := @use("../../../libraries/render/src/lib.hb");
+.{Surface} := render;
+.{Font} := render.text
 intouch := @use("../../../libraries/intouch/src/lib.hb")
 
+Label := struct {is_dirty: bool, surface: Surface, text: ^u8, text_length: uint}
+set_label_text := fn(label: Label, text: ^u8, text_length: uint): void {
+	label.is_dirty = true
+	label.text = text
+	label.text_length = text_length
+}
+
+render_label_to_surface := fn(surface: Surface, label: Label, font: Font): void {
+	if label.is_dirty {
+		render.clear(label.surface, render.blue)
+		render.put_text(label.surface, font, .(0, 0), render.red, "hi\0")
+	}
+	pos := Vec2(uint).(100, 100)
+	render.put_surface(surface, label.surface, pos, false)
+	render.sync(surface)
+}
+
+new_label := fn(text: ^u8): Label {
+	text_surface := render.new_surface(100, 16)
+	text_length := string.length(text)
+	label := Label.(true, text_surface, text, text_length)
+	return label
+}
+
 Window := struct {
 	// TODO: Replace this with widgets
 	implicit_framebuffer: render.Surface,
@@ -37,6 +63,7 @@ main := fn(): int {
 
 	mouse_x := 0
 	mouse_y := 0
+	text_label := new_label("Hi\0")
 
 	loop {
 		// Clear the screen
@@ -70,6 +97,8 @@ main := fn(): int {
 
 		render.put_rect(screen, .(0, 0), .(screen.width - 1, screen.height - 1), render.white)
 
+		render_label_to_surface(screen, text_label, font)
+
 		// Sync the screen
 		render.sync(screen)
 	}