Method new

examples/doom/src/runtime.rs:28–61

(wad_path: PathBuf, guest_path: PathBuf)

impl Runtime {
    pub fn new(wad_path: PathBuf, guest_path: PathBuf) -> Result<Self> {
        let module = tinywasm::parse_file(&guest_path)?;
        let mut store = Store::default();
        let host_state = Rc::new(RefCell::new(HostState::new(wad_path)));
        let imports = build_imports(&mut store, host_state.clone());
        let instance = ModuleInstance::instantiate(&mut store, &module, Some(imports))?;

        let wad_path_buf = instance.func::<(), i32>(&store, "tinywasm_doom_wad_path_buf")?;
        let init = instance.func::<(), ()>(&store, "tinywasm_doom_init")?;
        let update = instance.func::<(), ()>(&store, "tinywasm_doom_update")?;
        let framebuffer = instance.func::<(), i32>(&store, "tinywasm_doom_framebuffer")?;
        let key_down = instance.func::<i32, ()>(&store, "tinywasm_doom_key_down")?;
        let key_up = instance.func::<i32, ()>(&store, "tinywasm_doom_key_up")?;
        let memory = instance.memory("memory")?;

        let buf_ptr = wad_path_buf.call(&mut store, ())? as usize;
        let wad_path_string = host_state.borrow().wad_path.to_string_lossy().into_owned();
        memory.write_cstring_bytes(&mut store, buf_ptr, &wad_path_string)?;
        init.call(&mut store, ())?;

        let width = SCREEN_WIDTH;
        let height = SCREEN_HEIGHT;

        Ok(Self {
            store,
            update,
            framebuffer,
            key_down,
            key_up,
            memory,
            framebuffer_bytes: vec![0; width * height * 4],
            host_state,
        })
    }

    pub fn tick(&mut self) -> Result<()> {
        self.update.call(&mut self.store, ())?;