Set up a rust UI

src/shrooms_vb_core.rs

@@ -0,0 +1,37 @@
+
+#[repr(C)]
+struct VB { _data: [u8; 0] }
+
+#[link(name = "vb")]
+extern "C" {
+    #[link_name = "vbInit"]
+    fn vb_init(sim: *mut VB) -> *mut VB;
+
+    #[link_name = "vbSizeOf"]
+    fn vb_size_of() -> usize;
+
+    #[link_name = "vbGetKeys"]
+    fn vb_get_keys(sim: *mut VB) -> u16;
+}
+
+pub struct CoreVB {
+    sim: *mut VB,
+    _data: Box<[u8]>,
+}
+
+impl CoreVB {
+    pub fn new() -> Self {
+        let size = unsafe { vb_size_of() };
+        let mut data = vec![0; size].into_boxed_slice();
+        let sim = data.as_mut_ptr() as *mut VB;
+        unsafe { vb_init(sim) };
+        CoreVB {
+            sim,
+            _data: data
+        }
+    }
+
+    pub fn keys(&self) -> u16 {
+        unsafe { vb_get_keys(self.sim) }
+    }
+}