From bb7525206da1782fd9af49621aa52d87bd227838 Mon Sep 17 00:00:00 2001
From: Mica White <botahamec@outlook.com>
Date: Fri, 3 Jul 2026 11:28:15 -0400
Subject: Snake example

---
 examples/snake.rs | 156 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 156 insertions(+)
 create mode 100644 examples/snake.rs

(limited to 'examples')

diff --git a/examples/snake.rs b/examples/snake.rs
new file mode 100644
index 0000000..2163acf
--- /dev/null
+++ b/examples/snake.rs
@@ -0,0 +1,156 @@
+use std::time::{Duration, SystemTime};
+
+use bytemuck::{Pod, Zeroable, bytes_of, from_bytes_mut};
+use crossterm::{event::KeyCode, style::ContentStyle};
+use tortuise::{
+	buffer::{Buffer, Cell, Event},
+	file::FileManager,
+	input::InputManager,
+	scene::switch_scenes,
+	script::{ScriptContext, ScriptDeclaration, ScriptManager},
+};
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Pod, Zeroable)]
+#[repr(C)]
+struct Position {
+	x: i16,
+	y: i16,
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Pod, Zeroable)]
+#[repr(C)]
+struct GameState {
+	apple_location: Position,
+	snake_cells: [Position; 2],
+	direction: Position,
+	next_move: u128,
+}
+
+fn init_scene(_: &mut ScriptContext, state: &mut Box<[u8]>) {
+	*state = Box::from(bytes_of(&GameState {
+		apple_location: Position { x: 2, y: 2 },
+		snake_cells: [Position { x: 10, y: 5 }, Position { x: 9, y: 5 }],
+		direction: Position { x: 1, y: 0 },
+		next_move: SystemTime::now()
+			.checked_add(Duration::from_millis(200))
+			.unwrap()
+			.duration_since(SystemTime::UNIX_EPOCH)
+			.unwrap()
+			.as_millis(),
+	}))
+}
+
+fn render(ctx: &mut ScriptContext, byte_state: &mut Box<[u8]>) {
+	let state: &mut GameState = from_bytes_mut(byte_state);
+	if ctx.input.is_key_pressed_this_frame(KeyCode::Up) {
+		state.direction = Position { x: 0, y: -1 };
+	} else if ctx.input.is_key_pressed_this_frame(KeyCode::Right) {
+		state.direction = Position { x: 1, y: 0 };
+	} else if ctx.input.is_key_pressed_this_frame(KeyCode::Left) {
+		state.direction = Position { x: -1, y: 0 };
+	} else if ctx.input.is_key_pressed_this_frame(KeyCode::Down) {
+		state.direction = Position { x: 0, y: 1 };
+	}
+
+	let time = SystemTime::now()
+		.duration_since(SystemTime::UNIX_EPOCH)
+		.unwrap()
+		.as_millis();
+	if time > state.next_move {
+		state.next_move += 200;
+		state.snake_cells[1] = state.snake_cells[0];
+		state.snake_cells[0].x += state.direction.x;
+		state.snake_cells[0].y += state.direction.y;
+	}
+
+	if state.snake_cells[0] == state.apple_location {
+		let new_x = (getrandom::u32().unwrap() % ctx.buffer.window_size.columns as u32) as i16;
+		let new_y = (getrandom::u32().unwrap() % ctx.buffer.window_size.rows as u32) as i16;
+		state.apple_location = Position { x: new_x, y: new_y }
+	}
+
+	ctx.buffer.cells.clear();
+	ctx.buffer.cells.push(Cell {
+		character: '●',
+		style: ContentStyle {
+			foreground_color: Some(crossterm::style::Color::Red),
+			..Default::default()
+		},
+		x: state.apple_location.x.unsigned_abs(),
+		y: state.apple_location.y.unsigned_abs(),
+		z: 0,
+	});
+	for cell in state.snake_cells {
+		ctx.buffer.cells.push(Cell {
+			character: '█',
+			style: ContentStyle {
+				foreground_color: Some(crossterm::style::Color::Green),
+				..Default::default()
+			},
+			x: cell.x.unsigned_abs(),
+			y: cell.y.unsigned_abs(),
+			z: 1,
+		});
+	}
+}
+
+fn exit_on_escape(ctx: &mut ScriptContext, _: &mut Box<[u8]>) {
+	if ctx.input.is_key_pressed_this_frame(KeyCode::Esc) {
+		ctx.exit();
+	}
+}
+
+fn main() {
+	let stdout = Box::new(std::io::stdout().lock());
+	let mut buffer = Buffer::new(stdout).unwrap();
+	let mut input = InputManager::new();
+	let mut context = ScriptContext {
+		buffer: &mut buffer,
+		input: &input,
+	};
+	let scripts = [
+		ScriptDeclaration::Static {
+			start: None,
+			update: Some(exit_on_escape),
+			end: None,
+		},
+		ScriptDeclaration::Static {
+			start: Some(init_scene),
+			update: Some(render),
+			end: None,
+		},
+	];
+	let mut scripts = ScriptManager::new(&scripts);
+
+	let mut files = FileManager::default();
+	let manifest = files
+		.load_file(Box::from("manifest.toml".as_ref()))
+		.unwrap()
+		.unwrap_manifest()
+		.clone();
+	switch_scenes(
+		&manifest.scenes,
+		&mut scripts,
+		&mut context,
+		&mut files,
+		manifest.first_scene,
+	);
+
+	buffer
+		.render_loop(|buffer, event| match event {
+			Event::Key(event) => {
+				if event.is_press() {
+					input.press_key(event.code);
+				}
+			}
+			Event::Render => {
+				let mut context = ScriptContext {
+					buffer,
+					input: &input,
+				};
+				scripts.run_scripts(&mut context);
+				input.reset_next_frame();
+			}
+		})
+		.unwrap();
+}
-- 
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