I have cloned the repo and switch to the first chapter branch. The initial alert()
example worked but after I pasted the Life implementation in my rust file I am getting this webpack error when running npm run serve
:
ERROR in ./wasm_game_of_life_bg.wasm
Module parse failed: Unexpected section: 0x5f
You may need an appropriate loader to handle this file type.
Error: Unexpected section: 0x5f
...
@ ./wasm_game_of_life.js 2:0-47 13:39-50 14:45-56 25:34-69 32:40-51 33:47-58 50:16-40 53:32-49 57:4-24 62:4-24 66:11-29
@ ./index.js
@ ./bootstrap.js
@ multi (webpack)-dev-server/client?http://localhost:8081 ./bootstrap.js
ERROR in chunk 0
0.bootstrap.js
/Users/andrei/projects/wasm_game_of_life/wasm_game_of_life_bg.wasm
unexpected end
My lib.rs
looks like this:
#![feature(proc_macro, wasm_custom_section, wasm_import_module)]
extern crate wasm_bindgen;
use wasm_bindgen::prelude::*;
use std::fmt;
#[repr(u8)]
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum Cell {
Dead = 0,
Alive = 1,
}
#[wasm_bindgen]
pub struct Universe {
width: u32,
height: u32,
cells: Vec<Cell>,
}
#[wasm_bindgen]
impl Universe {
pub fn new() -> Universe {
let width = 64;
let height = 64;
let cells = (0..width * height)
.map(|i| {
if i % 2 == 0 || i % 7 == 0 {
Cell::Alive
} else {
Cell::Dead
}
})
.collect();
Universe {
width,
height,
cells,
}
}
pub fn render(&self) -> String {
self.to_string()
}
fn get_index(&self, row: u32, column: u32) -> usize {
(row * self.width + column) as usize
}
fn live_neighbor_count(&self, row: u32, column: u32) -> u8 {
let mut count = 0;
for delta_row in [self.height - 1, 0, 1].iter().cloned() {
for delta_col in [self.width - 1, 0, 1].iter().cloned() {
if delta_row == 0 && delta_col == 0 {
continue;
}
let neighbor_row = (row + delta_row) % self.height;
let neighbor_col = (column + delta_col) % self.width;
let idx = self.get_index(neighbor_row, neighbor_col);
count += self.cells[idx] as u8;
}
}
count
}
pub fn tick(&mut self) {
let mut next = self.cells.clone();
for row in 0..self.height {
for col in 0..self.width {
let idx = self.get_index(row, col);
let cell = self.cells[idx];
let live_neighbors = self.live_neighbor_count(row, col);
let next_cell = match (cell, live_neighbors) {
// Rule 1: Any live cell with fewer than two live neighbours
// dies, as if caused by underpopulation.
(Cell::Alive, x) if x < 2 => Cell::Dead,
// Rule 2: Any live cell with two or three live neighbours
// lives on to the next generation.
(Cell::Alive, 2) | (Cell::Alive, 3) => Cell::Alive,
// Rule 3: Any live cell with more than three live
// neighbours dies, as if by overpopulation.
(Cell::Alive, x) if x > 3 => Cell::Dead,
// Rule 4: Any dead cell with exactly three live neighbours
// becomes a live cell, as if by reproduction.
(Cell::Dead, 3) => Cell::Alive,
// All other cells remain in the same state.
(otherwise, _) => otherwise,
};
next[idx] = next_cell;
}
}
self.cells = next;
}
}
impl fmt::Display for Universe {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
for line in self.cells.as_slice().chunks(self.width as usize) {
for &cell in line {
let symbol = if cell == Cell::Dead { "◻️" } else { "◼️" };
write!(f, "{}", symbol)?;
}
write!(f, "\n")?;
}
Ok(())
}
}
It seems that the wasm file is wrongly compiled. But I can't figure out what happened.
Any help or suggestion is kindly welcomed!