Initial commit (import old repo)HEADmain

1 files changed, 73 insertions, 0 deletions

diff --git a/layers.ha b/layers.ha
new file mode 100644
index 0000000..ebe9ac2
--- /dev/null
+++ b/layers.ha
@@ -0,0 +1,73 @@
+type Layer = struct {
+	blocks_input: *fn() bool,
+	input: *fn(InputEvent) bool,
+	is_opaque: *fn() bool,
+	render: *fn() void,
+};
+
+type InputEvent = (CancelEvent | KeyEvent |
+	MouseButtonEvent | MouseOverEvent);
+
+type CancelEvent = void;
+
+type KeyEvent = struct {
+	status: ButtonStatus,
+	key: Key,
+};
+
+type Key = uint;
+
+type MouseButtonEvent = struct {
+	status: ButtonStatus,
+	button: MouseButton,
+};
+
+type MouseButton = enum u8 {
+	LEFT,
+	MIDDLE,
+	RIGHT,
+	X1,
+	X2,
+};
+
+type ButtonStatus = enum u8 {
+	UP,
+	HELD,
+	DOWN,
+};
+
+type MouseOverEvent = struct {
+	covered: bool,
+};
+
+const LAYERS = [
+	&LAYER_GAME,
+	&LAYER_HUD,
+	&LAYER_DEATH,
+	&LAYER_GAME_WAITING,
+	&LAYER_CLIENT_WAITING,
+];
+
+fn layers_input(event: InputEvent, top: size, all: bool) size = {
+	for (top > 0) {
+		top -= 1;
+		if (LAYERS[top].input(event) && !all) {
+			break;
+		};
+	};
+	return top;
+};
+
+fn layers_render() void = {
+	let bottom = len(LAYERS);
+	for (bottom != 0) {
+		bottom -= 1;
+		if (LAYERS[bottom].is_opaque()) {
+			break;
+		};
+	};
+
+	for (let i = bottom; i < len(LAYERS); i += 1) {
+		LAYERS[i].render();
+	};
+};