Fixed functions calls and added VR_init

src/lib.rs

@@ -1,3 +1,33 @@
 
 
-extern crate openvr_sys;
+extern crate openvr_sys;
+
+#[derive(Debug)]
+pub struct IVRSystem(*const ());
+
+impl IVRSystem {
+    /// Initalize the IVR System
+    pub fn init() -> Result<IVRSystem, openvr_sys::HmdError> {
+        let mut err = openvr_sys::HmdError::None;
+        let ptr = unsafe {
+            openvr_sys::VR_Init(&mut err as *mut openvr_sys::HmdError)
+        };
+        if ptr.is_null() {
+            Err(err)
+        } else {
+            Ok(IVRSystem(ptr))
+        }
+    }
+
+    /// Get the window bounds
+    pub fn bounds(&self) -> ((i32, i32), (u32, u32)) {
+        unsafe {
+            let ((mut x, mut y), (mut w, mut h)) = ((0, 0), (0, 0));
+            openvr_sys::VR_IVRSystem_GetWindowBounds(
+                self.0, &mut x, &mut y, &mut w, &mut h
+            );
+            ((x, y), (w, h))
+        }
+    }
+
+}