I don't know what i did wrong

game/app.odin

@@ -7,23 +7,26 @@ run :: proc() {
 	defer rl.CloseWindow()
 	rl.SetTargetFPS(60)
 
+	init_ui()
+	defer destroy_ui()
+
 	world := init_world()
 
 	for !rl.WindowShouldClose() {
 		dt := rl.GetFrameTime()
 
+		ui_prepare_frame(&world, dt)
 		update_world(&world, dt)
 
 		rl.BeginDrawing()
 		rl.ClearBackground(rl.Color{34, 139, 34, 255})
 
 		render_world(&world)
+		render_ui()
 		rl.EndDrawing()
 	}
 
 	delete(world.path)
 	delete(world.towers)
 	delete(world.events)
-
 }
-

game/hud.odin

@@ -1,11 +1,38 @@
 package game
 
+import clay "../clay-odin"
 import "core:fmt"
 import rl "vendor:raylib"
 
+UI_BAR_COLOR :: clay.Color{20, 40, 20, 200}
+UI_TEXT_COLOR :: clay.Color{240, 240, 230, 255}
+UI_GOLD_COLOR :: clay.Color{255, 215, 80, 255}
+
+build_hud :: proc(world: ^World) {
+	if clay.UI(clay.ID("HudBar"))({
+		layout = {
+			layoutDirection = .LeftToRight,
+			sizing = {
+				width  = clay.SizingGrow({}),
+				height = clay.SizingFixed(28),
+			},
+			padding = clay.PaddingAll(6),
+			childGap = 8,
+			childAlignment = {y = .Center},
+		},
+		backgroundColor = UI_BAR_COLOR,
+	}) {
+		gold_text := fmt.tprintf("Gold: %d", world.gold)
+		clay.Text(gold_text, clay.TextElementConfig{
+			textColor = UI_GOLD_COLOR,
+			fontId    = UI_FONT_ID,
+			fontSize  = 18,
+		})
+	}
+}
+
 render_hud :: proc(world: ^World) {
-	rl.DrawText(fmt.ctprintf("Gold: %d", world.gold), 10, 10, 22, rl.BLACK) // Gold HUD
-	rl.DrawText(fmt.ctprintf("Base HP: %d", world.base_health), 10, 32, 22, rl.BLACK) // HP HUD
+	rl.DrawText(fmt.ctprintf("Base HP: %d", world.base_health), 10, 32, 22, rl.BLACK)
 	rl.DrawText(fmt.ctprintf("Enemies: %d", active_enemy_count(world)), 10, 54, 22, rl.BLACK)
 	rl.DrawText(fmt.ctprintf("Wave: %d / %d", world.wave, MAX_WAVES), 10, 76, 22, rl.BLACK)
 
@@ -20,4 +47,3 @@ render_hud :: proc(world: ^World) {
 		rl.DrawText("Victory!", 260, 280, 40, rl.GREEN)
 	}
 }
-

game/ui.odin

@@ -0,0 +1,42 @@
+package game
+
+import clay "../clay-odin"
+import rl "vendor:raylib"
+
+ui_memory: [^]u8
+ui_arena: clay.Arena
+ui_render_commands: clay.ClayArray(clay.RenderCommand)
+
+ui_error_handler :: proc "c" (data: clay.ErrorData) {
+	_ = data
+}
+
+init_ui :: proc() {
+	ui_register_font()
+	clay.SetMeasureTextFunction(measure_text, nil)
+
+	min_size := clay.MinMemorySize()
+	ui_memory = make([^]u8, min_size)
+	ui_arena = clay.CreateArenaWithCapacityAndMemory(uint(min_size), ui_memory)
+	clay.Initialize(ui_arena, {f32(SCREEN_W), f32(SCREEN_H)}, {handler = ui_error_handler})
+}
+
+destroy_ui :: proc() {
+	free(ui_memory)
+}
+
+ui_prepare_frame :: proc(world: ^World, dt: f32) {
+	mouse := rl.GetMousePosition()
+	clay.SetLayoutDimensions({f32(SCREEN_W), f32(SCREEN_H)})
+	clay.SetPointerState({mouse.x, mouse.y}, rl.IsMouseButtonDown(.LEFT))
+	clay.UpdateScrollContainers(false, {}, dt)
+
+	clay.BeginLayout()
+	build_hud(world)
+	ui_render_commands = clay.EndLayout(dt)
+}
+
+render_ui :: proc() {
+	clay_raylib_render(&ui_render_commands)
+}
+

game/ui_render.odin

@@ -0,0 +1,69 @@
+package game
+
+import clay "../clay-odin"
+import "core:math"
+import "core:strings"
+import rl "vendor:raylib"
+
+UI_FONT_ID :: 0
+
+ui_font: rl.Font
+
+ui_register_font :: proc() {
+	ui_font = rl.GetFontDefault()
+}
+
+clay_color_to_rl :: proc(c: clay.Color) -> rl.Color {
+	return {u8(c.r), u8(c.g), u8(c.b), u8(c.a)}
+}
+
+measure_text :: proc "c" (
+	text: clay.StringSlice,
+	config: ^clay.TextElementConfig,
+	_: rawptr,
+) -> clay.Dimensions {
+	return {width = f32(text.length) * f32(config.fontSize) * 0.55, height = f32(config.fontSize)}
+}
+
+clay_raylib_render :: proc(commands: ^clay.ClayArray(clay.RenderCommand)) {
+	for i in 0 ..< commands.length {
+		cmd := clay.RenderCommandArray_Get(commands, i)
+		bounds := cmd.boundingBox
+
+		#partial switch cmd.commandType {
+		case .None:
+		case .Text:
+			cfg := cmd.renderData.text
+			text := string(cfg.stringContents.chars[:cfg.stringContents.length])
+			cstr := strings.clone_to_cstring(text, context.temp_allocator)
+
+			rl.DrawTextEx(
+				ui_font,
+				cstr,
+				{bounds.x, bounds.y},
+				f32(cfg.fontSize),
+				f32(cfg.letterSpacing),
+				clay_color_to_rl(cfg.textColor),
+			)
+		case .Rectangle:
+			cfg := cmd.renderData.rectangle
+			rl.DrawRectangle(
+				i32(math.round(bounds.x)),
+				i32(math.round(bounds.y)),
+				i32(math.round(bounds.width)),
+				i32(math.round(bounds.height)),
+				clay_color_to_rl(cfg.backgroundColor),
+			)
+		case .ScissorStart:
+			rl.BeginScissorMode(
+				i32(math.round(bounds.x)),
+				i32(math.round(bounds.y)),
+				i32(math.round(bounds.width)),
+				i32(math.round(bounds.height)),
+			)
+		case .ScissorEnd:
+			rl.EndScissorMode()
+		}
+	}
+}
+