rust-webvr 0.2.0

Safe rust API that provides a way to interact with Virtual Reality headsets and integration with vendor specific SDKs like OpenVR and Oculus. The API is inspired on the easy to use WebVR API but adapted to Rust design patterns
Documentation 
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use super::binding as openvr;
use super::binding::ETrackingUniverseOrigin::*;
use super::binding::EVRButtonId;
use super::binding::EVRButtonId::*;
use super::display::OpenVRDisplay;
use super::super::utils;
use std::cell::RefCell;
use std::mem;
use std::sync::Arc;
use {VRGamepad, VRGamepadState, VRGamepadButton};

pub type OpenVRGamepadPtr = Arc<RefCell<OpenVRGamepad>>;

pub struct OpenVRGamepad {
    gamepad_id: u64,
    index: openvr::TrackedDeviceIndex_t,
    system: *mut openvr::VR_IVRSystem_FnTable
}

unsafe impl Send for OpenVRGamepad {}
unsafe impl Sync for OpenVRGamepad {}

impl OpenVRGamepad {
    pub fn new(index: openvr::TrackedDeviceIndex_t,
               system: *mut openvr::VR_IVRSystem_FnTable)
               -> Arc<RefCell<OpenVRGamepad>> {
        Arc::new(RefCell::new(OpenVRGamepad {
            gamepad_id: utils::new_id(),
            index: index,
            system: system
        }))
    }
}

impl VRGamepad for OpenVRGamepad {
    fn id(&self) -> u64 {
        self.gamepad_id
    }

    fn name(&self) -> String {
        format!("OpenVR {:?}", self.index)
    }

    fn state(&self) -> VRGamepadState {
        let mut state = VRGamepadState::default();

        let mut controller: openvr::VRControllerState_t = unsafe { mem::uninitialized() };
        let mut tracked_poses: [openvr::TrackedDevicePose_t; openvr::k_unMaxTrackedDeviceCount as usize]
                              = unsafe { mem::uninitialized() };

        unsafe {
            (*self.system).GetControllerState.unwrap()(self.index,
                                                       &mut controller,
                                                       mem::size_of::<openvr::VRControllerState_t>() as u32);
            (*self.system).GetDeviceToAbsoluteTrackingPose.unwrap()(ETrackingUniverseOrigin_TrackingUniverseSeated,
                                                                    0.04f32,
                                                                    &mut tracked_poses[0],
                                                                    openvr::k_unMaxTrackedDeviceCount);
        }
        let pose = &tracked_poses[self.index as usize];

        state.connected = pose.bDeviceIsConnected;

        let trackpad = controller.rAxis[0];
        // Analog trigger data is in only the X axis
        let trigger = controller.rAxis[1];
        state.axes = [trackpad.x as f64, trackpad.y as f64, trigger.x as f64].to_vec();

        // TODO: check spec order
        let buttons = [
            button_mask(EVRButtonId_k_EButton_Grip),
            button_mask(EVRButtonId_k_EButton_ApplicationMenu) 
        ];

        for mask in buttons.iter() {
            state.buttons.push(VRGamepadButton {
                pressed: (controller.ulButtonPressed & mask) != 0,
                touched: (controller.ulButtonTouched & mask) != 0
            });
        }

        OpenVRDisplay::fetch_pose(&pose, &mut state.pose);

        state
    }
}

#[inline]
fn button_mask(id: EVRButtonId) -> u64 {
    1u64 << (id as u32)
}