feat: playable snake game via UART terminal rendering
Snake renders using ANSI escape codes via debug_putchar syscall, bypassing the VirtIO GPU (which has a QEMU 11.x legacy MMIO bug where transfer_to_host_2d succeeds but doesn't transfer data). Full microkernel stack running end-to-end: adapter → init → storage-server IPC → load snake from disk → input-server IPC (UART keyboard) → snake game logic → debug_putchar syscall → UART → terminal display Controls: WASD to steer, runs at 0.2s tick rate. Green O=head, o=body, red @=food, #=border.
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@@ -3,37 +3,119 @@
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extern crate userspace_rt;
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use snake::game::{Direction, GameState, Snake};
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use snake::renderer::{render, RenderCommand};
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use snake::game::{Direction, GameState, Snake, GRID_WIDTH, GRID_HEIGHT};
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use types::bounded::CapSlot;
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use types::time::Ticks;
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use userspace_rt::syscall;
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fn display_ep() -> CapSlot { CapSlot::new(0).unwrap() }
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fn input_ep() -> CapSlot { CapSlot::new(1).unwrap() }
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fn input_ep() -> CapSlot { CapSlot::new(0).unwrap() }
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const TICK_DELAY: u64 = 2_000_000;
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const MAX_RENDER_COMMANDS: usize = 192;
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fn putchar(c: u8) { syscall::debug_putchar(c); }
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fn puts(s: &[u8]) { for &b in s { putchar(b); } }
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fn move_cursor(row: u16, col: u16) {
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puts(b"\x1b[");
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print_dec(row + 1);
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putchar(b';');
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print_dec(col + 1);
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putchar(b'H');
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}
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fn print_dec(mut v: u16) {
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if v == 0 { putchar(b'0'); return; }
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let mut buf = [0u8; 5];
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let mut i = 0;
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while v > 0 { buf[i] = b'0' + (v % 10) as u8; v /= 10; i += 1; }
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while i > 0 { i -= 1; putchar(buf[i]); }
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}
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fn set_color(fg: u8) {
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puts(b"\x1b[");
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print_dec(fg as u16);
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putchar(b'm');
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}
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#[unsafe(no_mangle)]
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extern "C" fn main() {
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let mut snake = Snake::new();
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let mut commands = [RenderCommand { x: 0, y: 0, w: 0, h: 0, color: 0 }; MAX_RENDER_COMMANDS];
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puts(b"\x1b[2J"); // clear screen
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puts(b"\x1b[?25l"); // hide cursor
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// Draw border
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set_color(90); // dark grey
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move_cursor(0, 0);
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for _ in 0..GRID_WIDTH + 2 { putchar(b'#'); }
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for y in 0..GRID_HEIGHT {
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move_cursor(y + 1, 0);
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putchar(b'#');
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move_cursor(y + 1, GRID_WIDTH + 1);
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putchar(b'#');
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}
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move_cursor(GRID_HEIGHT + 1, 0);
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for _ in 0..GRID_WIDTH + 2 { putchar(b'#'); }
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loop {
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// Render
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render_game(&snake);
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wait_tick();
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handle_input(&mut snake);
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snake.tick();
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let count = render(&snake, &mut commands);
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send_render_commands(&commands, count);
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if snake.state() == GameState::GameOver {
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move_cursor(GRID_HEIGHT / 2, GRID_WIDTH / 2 - 4);
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set_color(91); // bright red
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puts(b"GAME OVER");
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set_color(0);
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move_cursor(GRID_HEIGHT + 3, 0);
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puts(b"Score: ");
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print_dec(snake.score());
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putchar(b'\n');
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let end = Ticks::from_raw(syscall::get_time().raw() + 50_000_000);
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while syscall::get_time().raw() < end.raw() { syscall::yield_now(); }
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puts(b"\x1b[?25h"); // show cursor
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return;
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}
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wait_tick();
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}
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}
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fn render_game(snake: &Snake) {
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// Clear game area
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for y in 0..GRID_HEIGHT {
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move_cursor(y + 1, 1);
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for _ in 0..GRID_WIDTH { putchar(b' '); }
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}
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// Draw food
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let food = snake.food();
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move_cursor(food.y + 1, food.x + 1);
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set_color(91); // bright red
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putchar(b'@');
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// Draw snake body
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let body = snake.body();
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for (i, pos) in body.iter().enumerate() {
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move_cursor(pos.y + 1, pos.x + 1);
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if i == 0 {
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set_color(92); // bright green
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putchar(b'O'); // head
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} else {
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set_color(32); // green
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putchar(b'o'); // body
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}
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}
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// Score
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set_color(0);
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move_cursor(GRID_HEIGHT + 2, 0);
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puts(b"Score: ");
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print_dec(snake.score());
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puts(b" WASD to move");
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}
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fn handle_input(snake: &mut Snake) {
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let _ = syscall::send(input_ep(), 0, 0, 0, 0);
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let (tag, kind, _, _) = syscall::receive(input_ep());
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@@ -49,22 +131,6 @@ fn handle_input(snake: &mut Snake) {
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}
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}
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fn send_render_commands(commands: &[RenderCommand], count: usize) {
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let _ = syscall::send(display_ep(), 1, 0, 0, 0);
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let _ = syscall::receive(display_ep());
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for i in 0..count {
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let cmd = &commands[i];
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let xy = cmd.x as usize | ((cmd.y as usize) << 16);
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let wh = cmd.w as usize | ((cmd.h as usize) << 16);
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let _ = syscall::send(display_ep(), 0, xy, wh, cmd.color as usize);
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let _ = syscall::receive(display_ep());
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}
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let _ = syscall::send(display_ep(), 2, 0, 0, 0);
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let _ = syscall::receive(display_ep());
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}
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fn wait_tick() {
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let start = syscall::get_time();
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let deadline = Ticks::from_raw(start.raw() + TICK_DELAY);
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@@ -1,11 +1,11 @@
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use crate::game::{Snake, Position, GRID_WIDTH, GRID_HEIGHT};
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const CELL_SIZE: u16 = 16;
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const BG_COLOR: u32 = 0x1A1A2E;
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const SNAKE_COLOR: u32 = 0x00FF41;
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const HEAD_COLOR: u32 = 0x00CC33;
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const FOOD_COLOR: u32 = 0xFF0040;
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const BORDER_COLOR: u32 = 0x333355;
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const CELL_SIZE: u16 = 24;
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const BG_COLOR: u32 = 0xFF202040;
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const SNAKE_COLOR: u32 = 0xFF00FF00;
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const HEAD_COLOR: u32 = 0xFF00CC00;
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const FOOD_COLOR: u32 = 0xFFFF0000;
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const BORDER_COLOR: u32 = 0xFF505080;
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#[derive(Clone, Copy)]
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pub struct RenderCommand {
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