feat: initial WASM support

Cargo.toml

@@ -10,8 +10,12 @@ edition = "2018"
 [lib]
 crate-type = ["cdylib", "rlib"]
 
+[features]
+wasm = ["wasm-bindgen"]
+
 [dependencies]
 getrandom = { version = "0.2", features = ["js"] }
+wasm-bindgen = { version = "0.2", optional = true }
 
 [profile.release]
 debug = false

README.md

@@ -23,6 +23,15 @@ The work of this emulator was inspired/started by [jc-chip8](https://github.com/
 * Full compliant with test CHIP-8 ROMs
 * RAM snapshot saving and loading
 
+## Build
+
+### WASM
+
+```bash
+cargo install wasm-pack
+wasm-pack build --release --target=nodejs -- --features wasm
+```
+
 ## Reason
 
 And... yes this is the real inspiration behind the emulator's name:

src/chip8_classic.rs

@@ -2,7 +2,7 @@ use std::fmt::Display;
 
 use crate::{chip8::Chip8, util::random};
 
-#[cfg(feature = "web")]
+#[cfg(feature = "wasm")]
 use wasm_bindgen::prelude::*;
 
 /// The width of the screen in pixels.
@@ -50,7 +50,7 @@ static FONT_SET: [u8; 80] = [
     0xf0, 0x80, 0xf0, 0x80, 0x80, // F
 ];
 
-#[cfg_attr(feature = "web", wasm_bindgen)]
+#[cfg_attr(feature = "wasm", wasm_bindgen)]
 pub struct Chip8Classic {
     vram: [u8; SCREEN_PIXEL_WIDTH * SCREEN_PIXEL_HEIGHT],
     ram: [u8; RAM_SIZE],
@@ -66,7 +66,6 @@ pub struct Chip8Classic {
     keys: [bool; NUM_KEYS],
 }
 
-#[cfg_attr(feature = "web", wasm_bindgen)]
 impl Chip8 for Chip8Classic {
     fn name(&self) -> &str {
         "classic"
@@ -152,8 +151,9 @@ impl Chip8 for Chip8Classic {
     }
 }
 
+#[cfg_attr(feature = "wasm", wasm_bindgen)]
 impl Chip8Classic {
-    #[cfg_attr(feature = "web", wasm_bindgen(constructor))]
+    #[cfg_attr(feature = "wasm", wasm_bindgen(constructor))]
     pub fn new() -> Chip8Classic {
         let mut chip8 = Chip8Classic {
             vram: [0u8; SCREEN_PIXEL_WIDTH * SCREEN_PIXEL_HEIGHT],

src/chip8_neo.rs

@@ -2,6 +2,9 @@ use std::io::{Cursor, Read};
 
 use crate::{chip8::Chip8, util::random};
 
+#[cfg(feature = "wasm")]
+use wasm_bindgen::prelude::*;
+
 pub const DISPLAY_WIDTH: usize = 64;
 pub const DISPLAY_HEIGHT: usize = 32;
 
@@ -47,7 +50,6 @@ pub struct Chip8Neo {
     last_key: u8,
 }
 
-#[cfg_attr(feature = "web", wasm_bindgen)]
 impl Chip8 for Chip8Neo {
     fn name(&self) -> &str {
         "neo"
@@ -306,8 +308,9 @@ impl Chip8 for Chip8Neo {
     }
 }
 
+#[cfg_attr(feature = "wasm", wasm_bindgen)]
 impl Chip8Neo {
-    #[cfg_attr(feature = "web", wasm_bindgen(constructor))]
+    #[cfg_attr(feature = "wasm", wasm_bindgen(constructor))]
     pub fn new() -> Chip8Neo {
         let mut chip8 = Chip8Neo {
             ram: [0u8; RAM_SIZE],
@@ -359,3 +362,9 @@ impl Chip8Neo {
         }
     }
 }
+
+impl Default for Chip8Neo {
+    fn default() -> Chip8Neo {
+        Chip8Neo::new()
+    }
+}