Added voxel and voxel map definitions

src/main.rs

@@ -1,3 +1,5 @@
+mod voxel;
+
 use std::borrow::Cow;
 use winit::{
     event::{Event, WindowEvent},

src/voxel.rs

@@ -0,0 +1,61 @@
+#[derive(PartialEq, Clone, Copy, Debug)]
+struct Voxel {
+    r: u8,
+    g: u8,
+    b: u8
+}
+
+const AIR_VOXEL: Voxel = Voxel { r: 0, g: 0, b: 0 };
+
+struct VoxelMap {
+    data: Vec<Voxel>,
+    width: usize,
+    height: usize,
+    depth: usize
+}
+
+impl VoxelMap {
+    fn new(width: usize, height: usize, depth: usize) -> Self {
+        Self {
+            data: vec![AIR_VOXEL; width * height * depth],
+            width,
+            height,
+            depth
+        }
+    }
+
+    fn set(&mut self, x: usize, y: usize, z: usize, voxel: Voxel) {
+        if x < self.width && y < self.height && z < self.depth {
+            self.data[x + y * self.width + z * self.width * self.height] = voxel;
+        }
+    }
+
+    fn get(&self, x: usize, y: usize, z: usize) -> Voxel {
+        if x < self.width && y < self.height && z < self.depth {
+            self.data[x + y * self.width + z * self.width * self.height]
+        } else {
+            AIR_VOXEL
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_voxel_map() {
+        let mut map = VoxelMap::new(10, 10, 10);
+        map.set(0, 0, 0, Voxel { r: 255, g: 0, b: 0 });
+        assert_eq!(map.get(0, 0, 0), Voxel { r: 255, g: 0, b: 0 });
+        assert_eq!(map.get(1, 0, 0), AIR_VOXEL);
+        assert_eq!(map.get(0, 1, 0), AIR_VOXEL);
+        assert_eq!(map.get(0, 0, 1), AIR_VOXEL);
+        assert_eq!(map.get(10, 0, 0), AIR_VOXEL);
+        assert_eq!(map.get(0, 10, 0), AIR_VOXEL);
+        assert_eq!(map.get(0, 0, 10), AIR_VOXEL);
+
+        // out of bounds
+        assert_eq!(map.get(0, 0, 11), AIR_VOXEL);
+    }
+}