feat: try to implement first FFI

Running into challenges. The Rust part compiles, but when building with
Webpack, I get this error:
```
ERROR in ./pkg/index_bg.wasm
Import "__wbindgen_bigint_from_u64" from "./index_bg.js" with
Non-JS-compatible Func Sigurature (i64 as parameter) can only be used
for direct wasm to wasm dependencies
 @ ./pkg/index.js
 @ ./js/index.js
ℹ ｢wdm｣: Failed to compile.
```

This issue (rustwasm/wasm-bindgen#3095) talks
about the same problem. The fix
(webpack/webpack#16339) was merged but not
backported into Webpack 4, so I'm going to have to try and upgrade to
fix.

Cargo.toml

@@ -15,6 +15,8 @@ default = ["console_error_panic_hook"]
 ndarray = "0.15.6"
 wasm-bindgen ="0.2.84"
 console_error_panic_hook = { version = "0.1.7", optional = true}
+serde = { version = "1.0", features = ["derive"]}
+serde-wasm-bindgen = "0.4"
 
 [dependencies.web-sys]
 version = "0.3.22"

js/index.js

@@ -22,6 +22,10 @@ function fill_grid_square(x, y, z){
 
 }
 
+function test_get_points_for_orientation(){
+
+}
+
 function setupGeometry() {
   const xy_plane = new THREE.GridHelper(7, 6);
   xy_plane.rotateX(THREE.MathUtils.DEG2RAD * 90);
@@ -39,8 +43,6 @@ function setupGeometry() {
   scene.add(yz_plane);
 
 
-
-
   const geometry = new THREE.SphereGeometry(0.5);
   const material = new THREE.MeshBasicMaterial({ color: 0x00ff00 });
   const sphere = new THREE.Mesh(geometry, material);

src/defs.rs

@@ -1,23 +1,30 @@
+use serde::{Deserialize, Serialize};
+use wasm_bindgen::prelude::*;
+
 pub const BOARD_SIZE: usize = 6;
 pub const PIECE_COUNT: usize = 54;
 pub const THREAD_COUNT: usize = 8;
 
 pub type Solution = Vec<Position>;
 pub type Board = ndarray::Array3<bool>;
 
-#[derive(Default, Debug, PartialEq, Eq, Clone, Copy)]
+#[derive(Default, Debug, PartialEq, Eq, Clone, Copy, Serialize, Deserialize)]
+#[wasm_bindgen]
 pub struct Point {
     pub x: usize,
     pub y: usize,
     pub z: usize,
 }
-#[derive(Debug, PartialEq, Eq, Clone, Copy)]
+
+#[derive(Debug, PartialEq, Eq, Clone, Copy, Serialize, Deserialize)]
 pub struct Position {
     pub center: Point,
     pub orientation: Orientation,
 }
 
-#[derive(Debug, PartialEq, Eq, Clone, Copy)]
+#[wasm_bindgen]
+#[repr(u8)]
+#[derive(Debug, PartialEq, Eq, Clone, Copy, Serialize, Deserialize)]
 pub enum Orientation {
     // viewed from the top
     FlatUp,             // ┴

src/helpers.rs

@@ -1,3 +1,6 @@
+use wasm_bindgen::{prelude::wasm_bindgen, JsValue};
+use web_sys::console;
+
 use crate::defs::*;
 
 // Checks to see if a given point and orientation overhangs an empty point. If so, we don't want to place a piece there.
@@ -93,6 +96,14 @@ pub fn inbounds_and_clear(board: &Board, point: &Point) -> bool {
     point.x < BOARD_SIZE && point.y < BOARD_SIZE && point.z < BOARD_SIZE && unsafe { !board.uget([point.x, point.y, point.z]) }
 }
 
+#[wasm_bindgen]
+pub fn wasm_get_points_for_orientation(point: Point, orientation: Orientation) -> JsValue {
+    console::log_1(&JsValue::from_str("this is from the wasm call"));
+    let result_points = get_points_for_orientation(&point, &orientation);
+
+    serde_wasm_bindgen::to_value(&result_points).unwrap()
+}
+
 pub fn get_points_for_orientation(point: &Point, orientation: &Orientation) -> [Point; 4] {
     let mut points: [Point; 4] = [*point; 4];