Rustic Mountain Core

A rust library for emulating the physics and graphics of the 2015 game jam release of Celeste Classic

Install

cargo add rustic-mountain-core

Basic Usage (eg, creating a port)

fn main(){
    // consts are not included in the core library. see examples here: https://github.com/CoolElectronics/rustic-mountain/blob/main/standalone/src/consts.rs
    let mut engine = Celeste::new(
        consts::MAPDATA.into(),
        consts::SPRITES.into(),
        consts::FLAGS.into(),
        consts::FONTATLAS.into(),
    );
    let pallete: [(u8, u8, u8); 16] = [
        (0, 0, 0),
        (29, 43, 83),
        (126, 37, 83),
        (0, 135, 81),
        (171, 82, 54),
        (95, 87, 79),
        (194, 195, 199),
        (255, 241, 232),
        (255, 0, 77),
        (255, 163, 0),
        (255, 236, 85),
        (0, 228, 54),
        (41, 173, 255),
        (131, 118, 156),
        (255, 119, 168),
        (255, 204, 170),
    ];

    loop {
        // advance the game logic
        engine.next_tick();
        // render the screen
        engine.draw();



        // screen buffer is a 128x128 array
        for (i, col) in engine.mem.graphics.iter().enumerate() {
            // look up rgb color from pallete
            let color = pallete[*col as usize];
            let xpixel = i % 128;
            let ypixel = i / 128;

            // do rendering to screen here
        }

                        engine.mem.buttons[0] = is_left_arrow_pressed;
                        engine.mem.buttons[1] = is_right_arrow_pressed;
                        engine.mem.buttons[2] = is_up_arrow_pressed;
                        engine.mem.buttons[3] = is_down_arrow_pressed;
                        engine.mem.buttons[4] = is_jump_pressed;
                        engine.mem.buttons[5] = is_dash_key_pressed;


        // constrain to 30fps
        ::std::thread::sleep(Duration::new(0, 1_000_000_000u32 / 30));
    }
}

Advanced usage

Most methods and fields are marked public, so the game can be messed with and extended easily. For example, you can iterate over the celeste.objects vector to find the player position, create your own maps, etc, etc. I'm not making docs, just read the code the main parts is only a little over 1k lines