Merge pull request #752 from ZNixian/master

Add Oculus Rift support

jme3-vr/build.gradle

@@ -2,7 +2,7 @@ if (!hasProperty('mainClass')) {
     ext.mainClass = ''
 }
 
-def lwjglVersion = '3.0.0'
+def lwjglVersion = '3.1.3'
 
 sourceCompatibility = '1.8'
 
@@ -14,4 +14,8 @@ dependencies {
 	// https://mvnrepository.com/artifact/net.java.dev.jna/jna
     compile group: 'net.java.dev.jna', name: 'jna', version: '4.3.0'
     compile 'com.nativelibs4java:jnaerator-runtime:0.12'
+
+    // Native LibOVR/Oculus support
+    compile "org.lwjgl:lwjgl-ovr:${lwjglVersion}"
+    runtime "org.lwjgl:lwjgl-ovr:${lwjglVersion}:natives-windows"
 }

jme3-vr/src/main/java/com/jme3/app/VRAppState.java

@@ -34,6 +34,8 @@ package com.jme3.app;
 import com.jme3.app.Application;
 import com.jme3.app.state.AbstractAppState;
 import com.jme3.app.state.AppStateManager;
+import com.jme3.input.vr.OculusVR;
+import com.jme3.input.vr.OpenVR;
 import com.jme3.input.vr.VRAPI;
 import com.jme3.input.vr.VRInputAPI;
 import com.jme3.math.ColorRGBA;
@@ -399,7 +401,7 @@ public class VRAppState extends AbstractAppState {
         
         //FIXME: check if this code is necessary.
         // Updates scene and gui states.
-        Iterator<Spatial> spatialIter = application.getViewPort().getScenes().iterator();
+        Iterator<Spatial> spatialIter = getLeftViewPort().getScenes().iterator();
         Spatial spatial = null;
         while(spatialIter.hasNext()){
         	spatial = spatialIter.next();
@@ -419,7 +421,10 @@ public class VRAppState extends AbstractAppState {
         }
         
         // use the analog control on the first tracked controller to push around the mouse
-        environment.getVRMouseManager().updateAnalogAsMouse(0, null, null, null, tpf);
+        // FIXME crashes on Rift/Touch (and probably OSVR), as it assumes the presence of the Vive touchpads
+        if(getVRHardware() instanceof OpenVR) {
+            environment.getVRMouseManager().updateAnalogAsMouse(0, null, null, null, tpf);
+        }
     }
 
     @Override
@@ -432,6 +437,16 @@ public class VRAppState extends AbstractAppState {
         }
     }
 
+    @Override
+    public void render(RenderManager rm) {
+        super.render(rm);
+
+        // update compositor
+        if( environment.getVRViewManager() != null ) {
+            environment.getVRViewManager().render();
+        }
+    }
+
     @Override
     public void initialize(AppStateManager stateManager, Application app) {
         super.initialize(stateManager, app);
@@ -598,7 +613,11 @@ public class VRAppState extends AbstractAppState {
             settings.setFrequency(environment.getVRHardware().getDisplayFrequency());
             settings.setFullscreen(false);
             settings.setVSync(false); // stop vsyncing on primary monitor!
-            settings.setSwapBuffers(environment.isSwapBuffers());
+
+            // TODO: Is this preventing desktop display on _ALL_ HMDs?
+            if(!(getVRHardware() instanceof OculusVR)) {
+                settings.setSwapBuffers(environment.isSwapBuffers());
+            }
         }
 
         // Updating application settings

jme3-vr/src/main/java/com/jme3/app/VRConstants.java

@@ -142,6 +142,13 @@ public class VRConstants {
      */
     public static final int SETTING_VRAPI_OPENVR_LWJGL_VALUE = 3;
 
+    /**
+     * The identifier of the LibOVR (Oculus) system.
+     *
+     * @see #SETTING_VRAPI
+     */
+    public static final int SETTING_VRAPI_OCULUSVR_VALUE = 4;
+    
     
     
 }

jme3-vr/src/main/java/com/jme3/app/VREnvironment.java

@@ -7,6 +7,7 @@ import java.util.logging.Logger;
 import com.jme3.app.state.AppState;
 import com.jme3.input.vr.OSVR;
 import com.jme3.input.vr.OpenVR;
+import com.jme3.input.vr.OculusVR;
 import com.jme3.input.vr.VRAPI;
 import com.jme3.input.vr.VRBounds;
 import com.jme3.input.vr.VRInputAPI;
@@ -18,6 +19,7 @@ import com.jme3.util.VRGuiManager;
 import com.jme3.util.VRMouseManager;
 import com.jme3.util.VRViewManager;
 import com.jme3.util.VRViewManagerOSVR;
+import com.jme3.util.VRViewManagerOculus;
 import com.jme3.util.VRViewManagerOpenVR;
 
 public class VREnvironment {
@@ -388,6 +390,8 @@ public class VREnvironment {
     		viewmanager = new VRViewManagerOpenVR(this);
     	} else if (vrBinding == VRConstants.SETTING_VRAPI_OSVR_VALUE){
     		viewmanager = new VRViewManagerOSVR(this);
+        } else if (vrBinding == VRConstants.SETTING_VRAPI_OCULUSVR_VALUE) {
+            viewmanager = new VRViewManagerOculus(this);
     	} else {
     		logger.severe("Cannot instanciate view manager, unknown VRAPI type: "+vrBinding);
     	}
@@ -419,6 +423,10 @@ public class VREnvironment {
             	hardware = new OpenVR(this);
             	initialized = true;
                 logger.config("Creating OpenVR wrapper [SUCCESS]");
+            } else if (vrBinding == VRConstants.SETTING_VRAPI_OCULUSVR_VALUE) {
+                hardware = new OculusVR(this);
+                initialized = true;
+                logger.config("Creating LibOVR wrapper [SUCCESS]");
             } else {
             	logger.config("Cannot create VR binding: "+vrBinding+" [FAILED]");
             	logger.log(Level.SEVERE, "Cannot initialize VR environment [FAILED]");

jme3-vr/src/main/java/com/jme3/input/vr/OculusVR.java

@@ -0,0 +1,661 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package com.jme3.input.vr;
+
+import com.jme3.app.VREnvironment;
+import com.jme3.math.*;
+import com.jme3.renderer.Camera;
+import com.jme3.texture.*;
+import org.lwjgl.*;
+import org.lwjgl.ovr.*;
+
+import java.nio.IntBuffer;
+import java.util.logging.Logger;
+
+import static org.lwjgl.BufferUtils.createPointerBuffer;
+import static org.lwjgl.ovr.OVR.*;
+import static org.lwjgl.ovr.OVRErrorCode.ovrSuccess;
+import static org.lwjgl.ovr.OVRUtil.ovr_Detect;
+import static org.lwjgl.system.MemoryUtil.*;
+
+/**
+ * Oculus VR (LibOVR 1.3.0) Native support.
+ * <p>
+ * A few notes about the Oculus coordinate system:
+ * <ul>
+ * <li>Matrices should be transposed</li>
+ * <li>Quaternions should be inverted<li/>
+ * <li>Vectors should have their X and Z axes flipped, but apparently not Y.</li>
+ * </ul>
+ *
+ * @author Campbell Suter <znix@znix.xyz>
+ */
+public class OculusVR implements VRAPI {
+
+    private static final Logger LOGGER = Logger.getLogger(OculusVR.class.getName());
+
+    private final VREnvironment environment;
+    private boolean initialized;
+
+    /**
+     * Pointer to the HMD object
+     */
+    private long session;
+
+    /**
+     * Information about the VR session (should the app quit, is
+     * it visible or is the universal menu open, etc)
+     */
+    private OVRSessionStatus sessionStatus;
+
+    /**
+     * HMD information, such as product name and manufacturer.
+     */
+    private OVRHmdDesc hmdDesc;
+
+    /**
+     * The horizontal resolution of the HMD
+     */
+    private int resolutionW;
+
+    /**
+     * The vertical resolution of the HMD
+     */
+    private int resolutionH;
+
+    /**
+     * Field-of-view data for each eye (how many degrees from the
+     * center can the user see).
+     */
+    private final OVRFovPort fovPorts[] = new OVRFovPort[2];
+
+    /**
+     * Data about each eye to be rendered - in particular, the
+     * offset from the center of the HMD to the eye.
+     */
+    private final OVREyeRenderDesc eyeRenderDesc[] = new OVREyeRenderDesc[2];
+
+    /**
+     * Store the projections for each eye, so we don't have to malloc
+     * and recalculate them each frame.
+     */
+    private final OVRMatrix4f[] projections = new OVRMatrix4f[2];
+
+    /**
+     * Store the poses for each eye, relative to the HMD.
+     *
+     * @see #getHMDMatrixPoseLeftEye()
+     */
+    private final Matrix4f[] hmdRelativeEyePoses = new Matrix4f[2];
+
+    /**
+     * Store the positions for each eye, relative to the HMD.
+     *
+     * @see #getHMDVectorPoseLeftEye()
+     */
+    private final Vector3f[] hmdRelativeEyePositions = new Vector3f[2];
+
+    /**
+     * The current state of the tracked components (HMD, touch)
+     */
+    private OVRTrackingState trackingState;
+
+    /**
+     * The position and orientation of the user's head.
+     */
+    private OVRPosef headPose;
+
+    /**
+     * The state of the Touch controllers.
+     */
+    private OculusVRInput input;
+
+    // The size of the texture drawn onto the HMD
+    private int textureW;
+    private int textureH;
+
+    // Layers to render into
+    private PointerBuffer layers;
+    private OVRLayerEyeFov layer0;
+
+    /**
+     * Chain texture set thing.
+     */
+    private long chains[];
+
+    /**
+     * Frame buffers we can draw into.
+     */
+    private FrameBuffer framebuffers[][];
+
+    public OculusVR(VREnvironment environment) {
+        this.environment = environment;
+    }
+
+    @Override
+    public OculusVRInput getVRinput() {
+        return input;
+    }
+
+    @Override
+    public String getName() {
+        return "OVR";
+    }
+
+    @Override
+    public int getDisplayFrequency() {
+        // TODO find correct frequency. I'm not sure
+        // if LibOVR has a way to do that, though.
+        return 60;
+    }
+
+    @Override
+    public boolean initialize() {
+        // Check to make sure the HMD is connected
+        OVRDetectResult detect = OVRDetectResult.calloc();
+        ovr_Detect(0, detect);
+        boolean connected = detect.IsOculusHMDConnected();
+        LOGGER.config("OVRDetectResult.IsOculusHMDConnected = " + connected);
+        LOGGER.config("OVRDetectResult.IsOculusServiceRunning = " + detect.IsOculusServiceRunning());
+        detect.free();
+
+        if (!connected) {
+            LOGGER.info("Oculus Rift not connected");
+            return false;
+        }
+
+        initialized = true;
+
+        // Set up the HMD
+        OVRLogCallback callback = new OVRLogCallback() {
+            @Override
+            public void invoke(long userData, int level, long message) {
+                LOGGER.fine("LibOVR [" + userData + "] [" + level + "] " + memASCII(message));
+            }
+        };
+        OVRInitParams initParams = OVRInitParams.calloc();
+        initParams.LogCallback(callback);
+        if (ovr_Initialize(initParams) != ovrSuccess) {
+            LOGGER.severe("LibOVR Init Failed");
+            return false; // TODO fix memory leak - destroy() is not called
+        }
+        LOGGER.config("LibOVR Version " + ovr_GetVersionString());
+        initParams.free();
+
+        // Get access to the HMD
+        LOGGER.info("Initialize HMD Session");
+        PointerBuffer pHmd = memAllocPointer(1);
+        OVRGraphicsLuid luid = OVRGraphicsLuid.calloc();
+        if (ovr_Create(pHmd, luid) != ovrSuccess) {
+            LOGGER.severe("Failed to create HMD");
+            return false; // TODO fix memory leak - destroy() is not called
+        }
+        session = pHmd.get(0);
+        memFree(pHmd);
+        luid.free();
+        sessionStatus = OVRSessionStatus.calloc();
+
+        // Get the information about the HMD
+        LOGGER.fine("Get HMD properties");
+        hmdDesc = OVRHmdDesc.malloc();
+        ovr_GetHmdDesc(session, hmdDesc);
+        if (hmdDesc.Type() == ovrHmd_None) {
+            LOGGER.warning("No HMD connected");
+            return false; // TODO fix memory leak - destroy() is not called
+        }
+
+        resolutionW = hmdDesc.Resolution().w();
+        resolutionH = hmdDesc.Resolution().h();
+
+        LOGGER.config("HMD Properties: "
+                + "\t Manufacturer: " + hmdDesc.ManufacturerString()
+                + "\t Product: " + hmdDesc.ProductNameString()
+                + "\t Serial: <hidden>" // + hmdDesc.SerialNumberString() // Hidden for privacy reasons
+                + "\t Type: " + hmdDesc.Type()
+                + "\t Resolution (total): " + resolutionW + "," + resolutionH);
+
+        if (resolutionW == 0) {
+            LOGGER.severe("HMD witdth=0 : aborting");
+            return false; // TODO fix memory leak - destroy() is not called
+        }
+
+        // Find the FOV for each eye
+        for (int eye = 0; eye < 2; eye++) {
+            fovPorts[eye] = hmdDesc.DefaultEyeFov(eye);
+        }
+
+        // Get the pose for each eye, and cache it for later.
+        for (int eye = 0; eye < 2; eye++) {
+            // Create the projection objects
+            projections[eye] = OVRMatrix4f.malloc();
+            hmdRelativeEyePoses[eye] = new Matrix4f();
+            hmdRelativeEyePositions[eye] = new Vector3f();
+
+            // Find the eye render information - we use this in the
+            // view manager for giving LibOVR it's timewarp information.
+            eyeRenderDesc[eye] = OVREyeRenderDesc.malloc();
+            ovr_GetRenderDesc(session, eye, fovPorts[eye], eyeRenderDesc[eye]);
+
+            // Get the pose of the eye
+            OVRPosef pose = eyeRenderDesc[eye].HmdToEyePose();
+
+            // Get the position and rotation of the eye
+            vecO2J(pose.Position(), hmdRelativeEyePositions[eye]);
+            Quaternion rotation = quatO2J(pose.Orientation(), new Quaternion());
+
+            // Put it into a matrix for the get eye pose functions
+            hmdRelativeEyePoses[eye].loadIdentity();
+            hmdRelativeEyePoses[eye].setTranslation(hmdRelativeEyePositions[eye]);
+            hmdRelativeEyePoses[eye].setRotationQuaternion(rotation);
+        }
+
+        // Recenter the HMD. The game itself should do this too, but just in case / before they do.
+        reset();
+
+        // Do this so others relying on our texture size (the GUI in particular) get it correct.
+        findHMDTextureSize();
+
+        // Allocate the memory for the tracking state - we actually
+        // set it up later, but Input uses it so calloc it now.
+        trackingState = OVRTrackingState.calloc();
+
+        // Set up the input
+        input = new OculusVRInput(this, session, sessionStatus, trackingState);
+
+        // TODO find some way to get in ovrTrackingOrigin_FloorLevel
+
+        // throw new UnsupportedOperationException("Not yet implemented!");
+        return true;
+    }
+
+    @Override
+    public void updatePose() {
+        double ftiming = ovr_GetPredictedDisplayTime(session, 0);
+        ovr_GetTrackingState(session, ftiming, true, trackingState);
+        ovr_GetSessionStatus(session, sessionStatus);
+
+        input.updateControllerStates();
+
+        headPose = trackingState.HeadPose().ThePose();
+    }
+
+    @Override
+    public boolean isInitialized() {
+        return initialized;
+    }
+
+    @Override
+    public void destroy() {
+        // fovPorts: contents are managed by LibOVR, no need to do anything.
+
+        // Clean up the input
+        input.dispose();
+
+        // Check if we've set up rendering - if so, clean that up.
+        if (chains != null) {
+            // Destroy our set of huge buffer images.
+            for (long chain : chains) {
+                ovr_DestroyTextureSwapChain(session, chain);
+            }
+
+            // Free up the layer
+            layer0.free();
+
+            // The layers array apparently takes care of itself (and crashes if we try to free it)
+        }
+
+        for (OVREyeRenderDesc eye : eyeRenderDesc) {
+            eye.free();
+        }
+        for (OVRMatrix4f projection : projections) {
+            projection.free();
+        }
+
+        hmdDesc.free();
+        trackingState.free();
+        sessionStatus.free();
+
+        // Wrap everything up
+        ovr_Destroy(session);
+        ovr_Shutdown();
+    }
+
+    @Override
+    public void reset() {
+        // Reset the coordinate system - where the user's head is now is facing forwards from [0,0,0]
+        ovr_RecenterTrackingOrigin(session);
+    }
+
+    @Override
+    public void getRenderSize(Vector2f store) {
+        if (!isInitialized()) {
+            throw new IllegalStateException("Cannot call getRenderSize() before initialized!");
+        }
+        store.x = textureW;
+        store.y = textureH;
+    }
+
+    @Override
+    public float getInterpupillaryDistance() {
+        return 0.065f; // TODO
+    }
+
+    @Override
+    public Quaternion getOrientation() {
+        return quatO2J(headPose.Orientation(), new Quaternion());
+    }
+
+    @Override
+    public Vector3f getPosition() {
+        return vecO2J(headPose.Position(), new Vector3f());
+    }
+
+    @Override
+    public void getPositionAndOrientation(Vector3f storePos, Quaternion storeRot) {
+        storePos.set(getPosition());
+        storeRot.set(getOrientation());
+    }
+
+    private Matrix4f calculateProjection(int eye, Camera cam) {
+        Matrix4f mat = new Matrix4f();
+
+        // Get LibOVR to find the correct projection
+        OVRUtil.ovrMatrix4f_Projection(fovPorts[eye], cam.getFrustumNear(), cam.getFrustumFar(), OVRUtil.ovrProjection_None, projections[eye]);
+
+        matrixO2J(projections[eye], mat);
+
+        return mat;
+    }
+
+    @Override
+    public Matrix4f getHMDMatrixProjectionLeftEye(Camera cam) {
+        return calculateProjection(ovrEye_Left, cam);
+    }
+
+    @Override
+    public Matrix4f getHMDMatrixProjectionRightEye(Camera cam) {
+        return calculateProjection(ovrEye_Right, cam);
+    }
+
+    @Override
+    public Vector3f getHMDVectorPoseLeftEye() {
+        return hmdRelativeEyePositions[ovrEye_Left];
+    }
+
+    @Override
+    public Vector3f getHMDVectorPoseRightEye() {
+        return hmdRelativeEyePositions[ovrEye_Right];
+    }
+
+    @Override
+    public Vector3f getSeatedToAbsolutePosition() {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public Matrix4f getHMDMatrixPoseLeftEye() {
+        return hmdRelativeEyePoses[ovrEye_Left];
+    }
+
+    @Override
+    public Matrix4f getHMDMatrixPoseRightEye() {
+        return hmdRelativeEyePoses[ovrEye_Left];
+    }
+
+    @Override
+    public HmdType getType() {
+        return HmdType.OCULUS_RIFT;
+    }
+
+    public boolean initVRCompositor(boolean set) {
+        if (!set) {
+            throw new UnsupportedOperationException("Cannot use LibOVR without compositor!");
+        }
+
+        setupLayers();
+
+        framebuffers = new FrameBuffer[2][];
+        for (int eye = 0; eye < 2; eye++)
+            setupFramebuffers(eye);
+
+        // TODO move initialization code here from VRViewManagerOculus
+        return true;
+    }
+
+    public void printLatencyInfoToConsole(boolean set) {
+        throw new UnsupportedOperationException("Not yet implemented!");
+    }
+
+    public void setFlipEyes(boolean set) {
+        throw new UnsupportedOperationException("Not yet implemented!");
+    }
+
+    public Void getCompositor() {
+        throw new UnsupportedOperationException("Not yet implemented!");
+    }
+
+    public Void getVRSystem() {
+        throw new UnsupportedOperationException("Not yet implemented!");
+    }
+
+    // Rendering-type stuff
+
+    public void findHMDTextureSize() {
+        // Texture sizes
+        float pixelScaling = 1.0f; // pixelsPerDisplayPixel
+
+        OVRSizei leftTextureSize = OVRSizei.malloc();
+        ovr_GetFovTextureSize(session, ovrEye_Left, fovPorts[ovrEye_Left], pixelScaling, leftTextureSize);
+
+        OVRSizei rightTextureSize = OVRSizei.malloc();
+        ovr_GetFovTextureSize(session, ovrEye_Right, fovPorts[ovrEye_Right], pixelScaling, rightTextureSize);
+
+        if (leftTextureSize.w() != rightTextureSize.w()) {
+            throw new IllegalStateException("Texture sizes do not match [horizontal]");
+        }
+        if (leftTextureSize.h() != rightTextureSize.h()) {
+            throw new IllegalStateException("Texture sizes do not match [vertical]");
+        }
+
+        textureW = leftTextureSize.w();
+        textureH = leftTextureSize.h();
+
+        leftTextureSize.free();
+        rightTextureSize.free();
+    }
+
+    private long setupTextureChain() {
+        // Set up the information for the texture buffer chain thing
+        OVRTextureSwapChainDesc swapChainDesc = OVRTextureSwapChainDesc.calloc()
+                .Type(ovrTexture_2D)
+                .ArraySize(1)
+                .Format(OVR_FORMAT_R8G8B8A8_UNORM_SRGB)
+                .Width(textureW)
+                .Height(textureH)
+                .MipLevels(1)
+                .SampleCount(1)
+                .StaticImage(false); // ovrFalse
+
+        // Create the chain
+        PointerBuffer textureSetPB = createPointerBuffer(1);
+        if (OVRGL.ovr_CreateTextureSwapChainGL(session, swapChainDesc, textureSetPB) != ovrSuccess) {
+            throw new RuntimeException("Failed to create Swap Texture Set");
+        }
+        swapChainDesc.free();
+
+        return textureSetPB.get(); // TODO is this a memory leak?
+    }
+
+    public void setupLayers() {
+        //Layers
+        layer0 = OVRLayerEyeFov.calloc();
+        layer0.Header().Type(ovrLayerType_EyeFov);
+        layer0.Header().Flags(ovrLayerFlag_TextureOriginAtBottomLeft);
+
+        chains = new long[2];
+        for (int eye = 0; eye < 2; eye++) {
+            long eyeChain = setupTextureChain();
+            chains[eye] = eyeChain;
+
+            OVRRecti viewport = OVRRecti.calloc();
+            viewport.Pos().x(0);
+            viewport.Pos().y(0);
+            viewport.Size().w(textureW);
+            viewport.Size().h(textureH);
+
+            layer0.ColorTexture(eye, eyeChain);
+            layer0.Viewport(eye, viewport);
+            layer0.Fov(eye, fovPorts[eye]);
+
+            viewport.free();
+            // we update pose only when we have it in the render loop
+        }
+
+        layers = createPointerBuffer(1);
+        layers.put(0, layer0);
+    }
+
+    /**
+     * Create a framebuffer for an eye.
+     */
+    public void setupFramebuffers(int eye) {
+        // Find the chain length
+        IntBuffer length = BufferUtils.createIntBuffer(1);
+        ovr_GetTextureSwapChainLength(session, chains[eye], length);
+        int chainLength = length.get();
+
+        LOGGER.fine("HMD Eye #" + eye + " texture chain length: " + chainLength);
+
+        // Create the frame buffers
+        framebuffers[eye] = new FrameBuffer[chainLength];
+        for (int i = 0; i < chainLength; i++) {
+            // find the GL texture ID for this texture
+            IntBuffer textureIdB = BufferUtils.createIntBuffer(1);
+            OVRGL.ovr_GetTextureSwapChainBufferGL(session, chains[eye], i, textureIdB);
+            int textureId = textureIdB.get();
+
+            // TODO less hacky way of getting our texture into JMonkeyEngine
+            Image img = new Image();
+            img.setId(textureId);
+            img.setFormat(Image.Format.RGBA8);
+            img.setWidth(textureW);
+            img.setHeight(textureH);
+
+            Texture2D tex = new Texture2D(img);
+
+            FrameBuffer buffer = new FrameBuffer(textureW, textureH, 1);
+            buffer.setDepthBuffer(Image.Format.Depth);
+            buffer.setColorTexture(tex);
+
+            framebuffers[eye][i] = buffer;
+        }
+    }
+
+    // UTILITIES
+    // TODO move to helper class
+
+    /**
+     * Copy the values from a LibOVR matrix into a jMonkeyEngine matrix.
+     *
+     * @param from The matrix to copy from.
+     * @param to   The matrix to copy to.
+     * @return The {@code to} argument.
+     */
+    public static Matrix4f matrixO2J(OVRMatrix4f from, Matrix4f to) {
+        to.loadIdentity(); // For the additional columns (unless I'm badly misunderstanding matricies)
+
+        for (int x = 0; x < 4; x++) {
+            for (int y = 0; y < 4; y++) {
+                float val = from.M(x + y * 4); // TODO verify this
+                to.set(x, y, val);
+            }
+        }
+
+        to.transposeLocal(); // jME vs LibOVR coordinate spaces - Yay!
+
+        return to;
+    }
+
+    /**
+     * Copy the values from a LibOVR quaternion into a jMonkeyEngine quaternion.
+     *
+     * @param from The quaternion to copy from.
+     * @param to   The quaternion to copy to.
+     * @return The {@code to} argument.
+     */
+    public static Quaternion quatO2J(OVRQuatf from, Quaternion to) {
+        // jME and LibOVR do their coordinate spaces differently for rotations, so flip Y and W (thanks, jMonkeyVR).
+        to.set(
+                from.x(),
+                -from.y(),
+                from.z(),
+                -from.w()
+        );
+
+        to.normalizeLocal();
+
+        return to;
+    }
+
+    /**
+     * Copy the values from a LibOVR vector into a jMonkeyEngine vector.
+     *
+     * @param from The vector to copy from.
+     * @param to   The vector to copy to.
+     * @return The {@code to} argument.
+     */
+    public static Vector3f vecO2J(OVRVector3f from, Vector3f to) {
+        // jME and LibOVR disagree on which way X and Z is, too.
+        to.set(
+                -from.x(),
+                from.y(),
+                -from.z()
+        );
+
+        return to;
+    }
+
+    // Getters, intended for VRViewManager.
+
+    public long getSessionPointer() {
+        return session;
+    }
+
+    public long getChain(int eye) {
+        return chains[eye];
+    }
+
+    public FrameBuffer[] getFramebuffers(int eye) {
+        return framebuffers[eye];
+    }
+
+    public PointerBuffer getLayers() {
+        return layers;
+    }
+
+    public OVRLayerEyeFov getLayer0() {
+        return layer0;
+    }
+
+    public OVRFovPort getFovPort() {
+        return fovPorts[ovrEye_Left]; // TODO checking the left and right eyes match
+    }
+
+    public OVRPosef getHeadPose() {
+        return headPose;
+    }
+
+    public OVRPosef getEyePose(int eye) {
+        return eyeRenderDesc[eye].HmdToEyePose();
+    }
+
+    public VREnvironment getEnvironment() {
+        return environment;
+    }
+}
+
+/* vim: set ts=4 softtabstop=0 sw=4 expandtab: */
+

jme3-vr/src/main/java/com/jme3/input/vr/OculusVRInput.java

@@ -0,0 +1,367 @@
+package com.jme3.input.vr;
+
+import com.jme3.app.VREnvironment;
+import com.jme3.math.*;
+import com.jme3.renderer.Camera;
+import com.jme3.scene.Spatial;
+import com.jme3.util.VRViewManagerOculus;
+import org.lwjgl.ovr.*;
+
+import static org.lwjgl.ovr.OVR.*;
+
+public class OculusVRInput implements VRInputAPI {
+    // State control
+    private final OVRInputState inputState;
+    private final OVRSessionStatus sessionStatus;
+    private final OVRTrackingState trackingState;
+    private final OculusVR hardware;
+    private long session;
+
+    // Setup values
+    private float axisMultiplier = 1;
+
+    // Cached stuff
+    private int buttons, touch;
+
+    // Used to calculate sinceLastCall stuff
+    private int lastButtons, lastTouch;
+    private final Vector2f[][] lastAxises;
+
+    /**
+     * The state data (linear and angular velocity and acceleration) for each hand
+     */
+    private OVRPoseStatef[] handStates;
+
+    /**
+     * The position and orientation of the Touch controllers.
+     */
+    private OVRPosef[] handPoses;
+
+    /**
+     * The object forms of the tracked controllers.
+     */
+    private final OculusController[] controllers = {
+            new OculusController(0),
+            new OculusController(1)
+    };
+
+    public OculusVRInput(OculusVR hardware, long session,
+                         OVRSessionStatus sessionStatus, OVRTrackingState trackingState) {
+        this.hardware = hardware;
+        this.session = session;
+        this.sessionStatus = sessionStatus;
+        this.trackingState = trackingState;
+
+        inputState = OVRInputState.calloc();
+
+        handStates = new OVRPoseStatef[ovrHand_Count];
+        handPoses = new OVRPosef[handStates.length];
+        lastAxises = new Vector2f[handStates.length][3]; // trigger+grab+thumbstick for each hand.
+    }
+
+    public void dispose() {
+        inputState.free();
+        session = 0; // Crashing > undefined behaviour if this object is incorrectly accessed again.
+    }
+
+    @Override
+    public void updateControllerStates() {
+        // Handle buttons, axies
+        ovr_GetInputState(session, ovrControllerType_Touch, inputState);
+        buttons = inputState.Buttons();
+        touch = inputState.Touches();
+
+        // Get the touch controller poses
+        // TODO what if no touch controllers are available?
+        for (int hand = 0; hand < handPoses.length; hand++) {
+            handStates[hand] = trackingState.HandPoses(hand);
+            handPoses[hand] = handStates[hand].ThePose();
+        }
+    }
+
+    private Vector3f cv(OVRVector3f in) {
+        // TODO do we want to reuse vectors rather than making new ones?
+        // TODO OpenVRInput does this, but it will probably cause some bugs.
+        return OculusVR.vecO2J(in, new Vector3f()); // This also fixes the coordinate space transform issues.
+    }
+
+    private Vector2f cv(OVRVector2f in) {
+        // TODO do we want to reuse vectors rather than making new ones?
+        // TODO OpenVRInput does this, but it will probably cause some bugs.
+        return new Vector2f(in.x(), in.y());
+    }
+
+    private Quaternion cq(OVRQuatf in) {
+        // TODO do we want to reuse quaternions rather than making new ones?
+        // TODO OpenVRInput does this, but it will probably cause some bugs.
+        return OculusVR.quatO2J(in, new Quaternion()); // This also fixes the coordinate space transform issues.
+    }
+
+    private Vector2f axis(float input) {
+        // See above comments about reusing vectors
+        return new Vector2f(input, input);
+    }
+
+    // Tracking (position, rotation, velocity, status)
+
+    @Override
+    public Vector3f getPosition(int index) {
+        return cv(handPoses[index].Position());
+    }
+
+    @Override
+    public Vector3f getVelocity(int controllerIndex) {
+        return cv(handStates[controllerIndex].LinearVelocity());
+    }
+
+    @Override
+    public Quaternion getOrientation(int index) {
+        return cq(handPoses[index].Orientation());
+    }
+
+    @Override
+    public Vector3f getAngularVelocity(int controllerIndex) {
+        return cv(handStates[controllerIndex].AngularVelocity());
+    }
+
+    @Override
+    public Quaternion getFinalObserverRotation(int index) {
+        // Copied from OpenVRInput
+
+        VREnvironment env = hardware.getEnvironment();
+        VRViewManagerOculus vrvm = (VRViewManagerOculus) hardware.getEnvironment().getVRViewManager();
+
+        Object obs = env.getObserver();
+        Quaternion tempq = new Quaternion(); // TODO move to class scope?
+        if (obs instanceof Camera) {
+            tempq.set(((Camera) obs).getRotation());
+        } else {
+            tempq.set(((Spatial) obs).getWorldRotation());
+        }
+
+        return tempq.multLocal(getOrientation(index));
+    }
+
+    @Override
+    public Vector3f getFinalObserverPosition(int index) {
+        // Copied from OpenVRInput
+
+        VREnvironment env = hardware.getEnvironment();
+        VRViewManagerOculus vrvm = (VRViewManagerOculus) hardware.getEnvironment().getVRViewManager();
+
+        Object obs = env.getObserver();
+        Vector3f pos = getPosition(index);
+        if (obs instanceof Camera) {
+            ((Camera) obs).getRotation().mult(pos, pos);
+            return pos.addLocal(((Camera) obs).getLocation());
+        } else {
+            ((Spatial) obs).getWorldRotation().mult(pos, pos);
+            return pos.addLocal(((Spatial) obs).getWorldTranslation());
+        }
+    }
+
+    @Override
+    public boolean isInputDeviceTracking(int index) {
+        int flags = trackingState.HandStatusFlags(index);
+        return (flags & ovrStatus_PositionTracked) != 0; // TODO do we require orientation as well?
+    }
+
+    // Input Getters
+
+    @Override
+    public Vector2f getAxis(int controllerIndex, VRInputType forAxis) {
+        Vector2f result = getAxisRaw(controllerIndex, forAxis);
+        return result == null ? null : result.multLocal(axisMultiplier);
+    }
+
+    @Override
+    public Vector2f getAxisRaw(int controllerIndex, VRInputType forAxis) {
+        switch (forAxis) {
+            case OculusThumbstickAxis:
+                return cv(inputState.Thumbstick(controllerIndex));
+            case OculusTriggerAxis:
+                return axis(inputState.IndexTrigger(controllerIndex));
+            case OculusGripAxis:
+                return axis(inputState.HandTrigger(controllerIndex));
+            default:
+                return null;
+        }
+    }
+
+    @Override
+    public boolean isButtonDown(int controllerIndex, VRInputType checkButton) {
+        return isButtonDownForStatus(controllerIndex, checkButton, buttons, touch);
+    }
+
+    public boolean isButtonDownForStatus(int controllerIndex, VRInputType checkButton, int buttons, int touch) {
+        int buttonMask = (controllerIndex == ovrHand_Left) ? ovrButton_LMask : ovrButton_RMask;
+        int touchMask = (controllerIndex == ovrHand_Left) ?
+                (ovrTouch_LButtonMask + ovrTouch_LPoseMask) :
+                (ovrTouch_RButtonMask + ovrTouch_RPoseMask);
+
+        switch (checkButton) {
+            default:
+                return false;
+
+            case OculusTopButton: // Physical buttons
+            case OculusBottomButton:
+            case OculusThumbstickButton:
+            case OculusMenuButton:
+                return (buttons & buttonMask & checkButton.getValue()) != 0;
+
+            case OculusTopTouch: // Standard capacitive buttons
+            case OculusBottomTouch:
+            case OculusThumbstickTouch:
+            case OculusThumbrestTouch:
+            case OculusIndexTouch:
+            case OculusThumbUp: // Calculated/virtual capacitive buttons
+            case OculusIndexPointing:
+                return (touch & touchMask & checkButton.getValue()) != 0;
+        }
+    }
+
+    // Since-last-call stuff
+
+    @Override
+    public void resetInputSinceLastCall() {
+        lastButtons = 0;
+        lastTouch = 0;
+    }
+
+    @Override
+    public boolean wasButtonPressedSinceLastCall(int controllerIndex, VRInputType checkButton) {
+        boolean wasPressed = isButtonDownForStatus(controllerIndex, checkButton, lastButtons, lastTouch);
+        lastButtons = buttons;
+        lastTouch = touch;
+        return !wasPressed && isButtonDown(controllerIndex, checkButton);
+    }
+
+    @Override
+    public Vector2f getAxisDeltaSinceLastCall(int controllerIndex, VRInputType forAxis) {
+        int index;
+        switch (forAxis) {
+            case OculusTriggerAxis:
+                index = 0;
+                break;
+            case OculusGripAxis:
+                index = 1;
+                break;
+            case OculusThumbstickAxis:
+                index = 2;
+                break;
+            default:
+                return null;
+        }
+
+        Vector2f last = lastAxises[controllerIndex][index];
+        if (last == null) {
+            last = lastAxises[controllerIndex][index] = new Vector2f();
+        }
+
+        Vector2f current = getAxis(controllerIndex, forAxis);
+
+        // TODO could this lead to accuracy problems?
+        current.subtractLocal(last);
+        last.addLocal(current);
+
+        return current;
+    }
+
+    // Misc
+
+    @Override
+    public boolean init() {
+        throw new UnsupportedOperationException("Input initialized at creation time");
+    }
+
+    @Override
+    public void updateConnectedControllers() {
+        throw new UnsupportedOperationException("Automatically done by LibOVR (I think?)");
+    }
+
+    @Override
+    public float getAxisMultiplier() {
+        return axisMultiplier;
+    }
+
+    @Override
+    public void setAxisMultiplier(float axisMultiplier) {
+        this.axisMultiplier = axisMultiplier;
+    }
+
+    @Override
+    public void triggerHapticPulse(int controllerIndex, float seconds) {
+        // TODO: How do we time so we can turn the feedback off?
+    }
+
+    @Override
+    public boolean isInputFocused() {
+        return sessionStatus.IsVisible(); // TODO do we need HmdMounted, or is it counted in IsVisible
+    }
+
+    @Override
+    public Object getRawControllerState(int index) {
+        throw new UnsupportedOperationException("Cannot get raw controller state!");
+    }
+
+    @Override
+    public void swapHands() {
+        // Do nothing.
+        // TODO although OSVR and OpenVR if it has more than two controllers both do nothing, shouldn't we be
+        // TODO throwing an exception or something?
+    }
+
+    @Override
+    public int getTrackedControllerCount() {
+        // TODO: Shouldn't we be seeing if the user has the touch controllers first?
+        return 2;
+    }
+
+    @Override
+    public VRTrackedController getTrackedController(int index) {
+        return controllers[index];
+    }
+
+    /**
+     * The object form representation of a controller.
+     */
+    public class OculusController implements VRTrackedController {
+
+        /**
+         * The ID of the hand to track
+         */
+        private int hand;
+
+        public OculusController(int hand) {
+            this.hand = hand;
+        }
+
+        @Override
+        public String getControllerName() {
+            return "Touch"; // TODO
+        }
+
+        @Override
+        public String getControllerManufacturer() {
+            return "Oculus"; // TODO
+        }
+
+        @Override
+        public Vector3f getPosition() {
+            return OculusVRInput.this.getPosition(hand);
+        }
+
+        @Override
+        public Quaternion getOrientation() {
+            return OculusVRInput.this.getOrientation(hand);
+        }
+
+        @Override
+        public Matrix4f getPose() {
+            Matrix4f mat = new Matrix4f();
+            mat.setRotationQuaternion(getOrientation());
+            mat.setTranslation(getPosition());
+            return mat;
+        }
+    }
+}

jme3-vr/src/main/java/com/jme3/input/vr/VRAPI.java

@@ -86,7 +86,8 @@ public interface VRAPI {
     public boolean isInitialized();
 
     /**
-     * Reset the VR system.
+     * Reset (recenter) the VR system. The current position of the HMD is
+     * now considered the origin (observer+[0,0,0]).
      */
     public void reset();
 

jme3-vr/src/main/java/com/jme3/input/vr/VRInputType.java

@@ -1,5 +1,7 @@
 package com.jme3.input.vr;
 
+import static org.lwjgl.ovr.OVR.*; // For the button constants
+
 /**
  * The type of a VR input. This enumeration enables to determine which part of the VR device is involved within input callback.
  * @author reden - phr00t - https://github.com/phr00t
@@ -26,7 +28,103 @@ public enum VRInputType {
 	/**
 	 * an HTC vive menu button (about <a href="https://www.vive.com/us/support/category_howto/720435.html">Vive controller</a>).
 	 */
-    ViveMenuButton(3);
+    ViveMenuButton(3),
+
+	/**
+	 * The thumbstick on the Oculus Touch controllers.
+	 * 
+	 * Unlike the Vive controllers where the touchpad is commonly used
+	 * as a virtual DPad, you should avoid using the thumbstick for purposes
+	 * that do not require analog input.
+	 */
+	OculusThumbstickAxis(0),
+
+	/**
+	 * The trigger button on the Oculus Touch controllers.
+	 * 
+	 * This is the button under the user's index finger, and should not be used to
+	 * pick up objects. See the 
+	 * <a href="https://developer.oculus.com/documentation/pcsdk/latest/concepts/dg-input-touch-overview/"
+	 * >Oculus Developer</a> documentation.
+	 */
+	OculusTriggerAxis(0),
+
+	/**
+	 * The 'grab' button on the Oculus Touch controllers.
+	 * 
+	 * This button should only (unless you have a compelling reason otherwise) be used to pick up objects.
+	 */
+	OculusGripAxis(0),
+
+	/**
+	 * The upper buttons on the Oculus Touch controllers - B on the right controller, and Y on the left.
+	 */
+	OculusTopButton(ovrButton_B | ovrButton_Y),
+
+	/**
+	 * The lower (not counting menu) buttons on the Oculus Touch
+	 * controllers - A on the right controller, and X on the left.
+	 */
+	OculusBottomButton(ovrButton_A | ovrButton_X),
+
+	/**
+	 * The 'click' button on the Oculus Touch thumbsticks.
+	 */
+	OculusThumbstickButton(ovrButton_LThumb | ovrButton_RThumb),
+
+	/**
+	 * The game-usable menu button, under and to the left of the 'X' button on the left controller.
+	 * 
+	 * Most games use this to pause - it preferably should be used for at least that purpose, and is
+	 * uncomfortable to rest your thumb on (in games where you suddenly have to pause/open a menu).
+	 */
+	OculusMenuButton(ovrButton_Enter),
+
+	/**
+	 * The capacitive touch sensors on the top buttons (Y and B) of the Oculus Touch.
+	 */
+	OculusTopTouch(ovrTouch_B | ovrTouch_Y),
+
+	/**
+	 * The capacitive touch sensors on the lower buttons (X and A) of the Oculus Touch.
+	 */
+	OculusBottomTouch(ovrTouch_A | ovrTouch_X),
+
+	/**
+	 * The capacitive touch sensors on the thumbsticks of the Oculus Touch.
+	 */
+	OculusThumbstickTouch(ovrTouch_LThumb | ovrTouch_RThumb),
+
+	/**
+	 * The capacitive touch sensors on the thumbrests of the Oculus Touch - this is a textured pad
+     * on the Oculus Touch controller next to the ABXY buttons for users to reset their thumbs on.
+	 * 
+	 * While it probably goes without saying, only use this for gesture support and do not bind game
+	 * elements to it.
+	 */
+	OculusThumbrestTouch(ovrTouch_LThumbRest | ovrTouch_RThumbRest),
+
+	/**
+	 * The state of a software calculation based on the capacitive touch sensor values that determine if
+	 * the user has lifted their thumb off the controller, and can be used for gesture support.
+	 * 
+	 * This should be used instead of calculating this yourself based on the touch results of all the other
+	 * parts of the controller.
+	 */
+	OculusThumbUp(ovrTouch_LThumbUp | ovrTouch_RThumbUp),
+
+	/**
+	 * Is the user resting their finger on the trigger of an Oculus Touch controller?
+	 */
+	OculusIndexTouch(ovrTouch_LIndexPointing | ovrTouch_RIndexPointing),
+
+	/**
+	 * Is the user pointing their finger forwards, as if to press a button?
+	 * 
+	 * This is internally calculated from proximity and filtering is applied - it should be used rather
+	 * than !OculusIndexTouch, as it will probably lead to better results.
+	 */
+	OculusIndexPointing(ovrTouch_LIndexPointing | ovrTouch_RIndexPointing);
     
     /**
      * The value that codes the input type.

jme3-vr/src/main/java/com/jme3/util/AbstractVRViewManager.java

@@ -129,6 +129,10 @@ public abstract class AbstractVRViewManager implements VRViewManager {
     	return environment;
     }
 
+    @Override
+    public void render() {
+    }
+    
     /**
      * Handles moving filters from the main view to each eye
      */

jme3-vr/src/main/java/com/jme3/util/VRMouseManager.java

@@ -182,6 +182,7 @@ public class VRMouseManager {
     	        }
     	        
     	        Vector2f tpDelta;
+    	        // TODO option to use Touch joysticks
     	        if( thumbstickMode ) {
     	            tpDelta = environment.getVRinput().getAxis(inputIndex, VRInputType.ViveTrackpadAxis);
     	        } else {

jme3-vr/src/main/java/com/jme3/util/VRViewManager.java

@@ -150,6 +150,12 @@ public interface VRViewManager {
      */
     public void update(float tpf);
     
+    /**
+     * Set up the scene for rendering.
+     * This method should be called before any rendering takes place.
+     */
+    public void render();
+
     /**
      * Send the rendering result as textures to the two eyes. 
      * This method should be called after all the rendering operations 

jme3-vr/src/main/java/com/jme3/util/VRViewManagerOculus.java

@@ -0,0 +1,340 @@
+/*
+ * Copyright (c) 2009-2017 jMonkeyEngine
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ *
+ * * Neither the name of 'jMonkeyEngine' nor the names of its contributors
+ *   may be used to endorse or promote products derived from this software
+ *   without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package com.jme3.util;
+
+import com.jme3.app.VREnvironment;
+import com.jme3.input.vr.OculusVR;
+import com.jme3.input.vr.VRAPI;
+import com.jme3.math.*;
+import com.jme3.renderer.Camera;
+import com.jme3.renderer.ViewPort;
+import com.jme3.scene.Spatial;
+import com.jme3.texture.*;
+
+import java.nio.IntBuffer;
+import java.util.Iterator;
+import java.util.Objects;
+import java.util.logging.Logger;
+
+import org.lwjgl.ovr.*;
+
+import static org.lwjgl.ovr.OVR.*;
+import static org.lwjgl.ovr.OVRErrorCode.*;
+
+/**
+ * A rendering system for Oculus's LibOVR API.
+ *
+ * @author Campbell Suter <znix@znix.xyz>
+ */
+public class VRViewManagerOculus extends AbstractVRViewManager {
+
+    private static final Logger LOG = Logger.getLogger(VRViewManagerOculus.class.getName());
+
+    private final VREnvironment environment;
+    private final OculusVR hardware;
+
+    // Copied from OSVR
+    //final & temp values for camera calculations
+    private final Vector3f finalPosition = new Vector3f();
+    private final Quaternion finalRotation = new Quaternion();
+    private final Vector3f hmdPos = new Vector3f();
+    private final Quaternion hmdRot = new Quaternion();
+
+    public VRViewManagerOculus(VREnvironment environment) {
+        this.environment = environment;
+
+        VRAPI hardware = environment.getVRHardware();
+        Objects.requireNonNull(hardware, "Attached VR Hardware cannot be null");
+        if (!(hardware instanceof OculusVR)) {
+            throw new IllegalStateException("Cannot use Oculus VR view manager on non-Oculus hardware state!");
+        }
+
+        this.hardware = (OculusVR) hardware;
+
+        if (!environment.compositorAllowed()) {
+            throw new UnsupportedOperationException("Cannot render without compositor on LibOVR");
+        }
+    }
+
+    @Override
+    public void initialize() {
+        setupCamerasAndViews();
+
+        if (environment.hasTraditionalGUIOverlay()) {
+
+            environment.getVRMouseManager().initialize();
+
+            // update the pose to position the gui correctly on start
+            update(0f);
+            environment.getVRGUIManager().positionGui();
+        }
+    }
+
+    private long session() {
+        return hardware.getSessionPointer();
+    }
+
+    @Override
+    public void update(float tpf) {
+        // TODO
+
+        hardware.updatePose();
+
+        // TODO deduplicate
+        if (environment == null) {
+            throw new IllegalStateException("This VR view manager is not attached to any VR environment.");
+        }
+
+        // grab the observer
+        Object obs = environment.getObserver();
+        Quaternion objRot;
+        Vector3f objPos;
+        if (obs instanceof Camera) {
+            objRot = ((Camera) obs).getRotation();
+            objPos = ((Camera) obs).getLocation();
+        } else {
+            objRot = ((Spatial) obs).getWorldRotation();
+            objPos = ((Spatial) obs).getWorldTranslation();
+        }
+
+        // update the HMD's position & orientation
+        hardware.getPositionAndOrientation(hmdPos, hmdRot);
+        if (obs != null) {
+            // update hmdPos based on obs rotation
+            finalRotation.set(objRot);
+            finalRotation.mult(hmdPos, hmdPos);
+            finalRotation.multLocal(hmdRot);
+        }
+
+        // Update both eye cameras
+        finalizeCamera(hardware.getHMDVectorPoseLeftEye(), objPos, leftCamera);
+        finalizeCamera(hardware.getHMDVectorPoseRightEye(), objPos, rightCamera);
+
+        // Update the main camera, so it shows the same basic view the HMD is getting
+        // TODO: Do this in VRAppState, so it works on all HMDs.
+        // I only have a Rift, so I can't test it on anything else.
+        if(!environment.isInstanceRendering()) { // We use the app camera as the left camera here
+            // TODO: Double up on rendering and use one eye, to reduce GPU load rendering the scene again.
+            // TODO: Snip at the image to remove the distorted corners from a very high FOV.
+            finalizeCamera(Vector3f.ZERO, objPos, environment.getApplication().getCamera());
+        }
+
+        if (environment.hasTraditionalGUIOverlay()) {
+            // update the mouse?
+            environment.getVRMouseManager().update(tpf);
+
+            // update GUI position?
+            if (environment.getVRGUIManager().wantsReposition || environment.getVRGUIManager().getPositioningMode() != VRGUIPositioningMode.MANUAL) {
+                environment.getVRGUIManager().positionGuiNow(tpf);
+                environment.getVRGUIManager().updateGuiQuadGeometricState();
+            }
+        }
+    }
+
+    /**
+     * Place the camera within the scene.
+     *
+     * @param eyePos      the eye position.
+     * @param obsPosition the observer position.
+     * @param cam         the camera to place.
+     */
+    private void finalizeCamera(Vector3f eyePos, Vector3f obsPosition, Camera cam) {
+        finalRotation.mult(eyePos, finalPosition);
+        finalPosition.addLocal(hmdPos);
+        if (obsPosition != null) {
+            finalPosition.addLocal(obsPosition);
+        }
+        finalPosition.y += getHeightAdjustment();
+        cam.setFrame(finalPosition, finalRotation);
+    }
+
+    @Override
+    public void render() {
+
+        // Calculate the render pose (translation/rotation) for each eye.
+        // LibOVR takes the difference between this and the real position of each eye at display time
+        // to apply AZW (timewarp).
+
+        OVRPosef.Buffer hmdToEyeOffsets = OVRPosef.calloc(2);
+        hmdToEyeOffsets.put(0, hardware.getEyePose(ovrEye_Left));
+        hmdToEyeOffsets.put(1, hardware.getEyePose(ovrEye_Right));
+
+        //calculate eye poses
+        OVRUtil.ovr_CalcEyePoses(hardware.getHeadPose(), hmdToEyeOffsets, hardware.getLayer0().RenderPose());
+        hmdToEyeOffsets.free();
+
+        for (int eye = 0; eye < 2; eye++) {
+            IntBuffer currentIndexB = BufferUtils.createIntBuffer(1);
+            ovr_GetTextureSwapChainCurrentIndex(session(), hardware.getChain(eye), currentIndexB);
+            int index = currentIndexB.get();
+
+            // Constantly (each frame) rotating through a series of
+            // frame buffers, so make sure we write into the correct one.
+            (eye == ovrEye_Left ? leftViewPort : rightViewPort).setOutputFrameBuffer(hardware.getFramebuffers(eye)[index]);
+        }
+
+        // Now the game will render into the buffers given to us by LibOVR
+    }
+
+    @Override
+    public void postRender() {
+        // We're done with our textures now - the game is done drawing into them.
+        for (int eye = 0; eye < 2; eye++) {
+            ovr_CommitTextureSwapChain(session(), hardware.getChain(eye));
+        }
+
+        // Send the result to the HMD
+        int result = ovr_SubmitFrame(session(), 0, null, hardware.getLayers());
+        if (result != ovrSuccess) {
+            throw new IllegalStateException("Failed to submit frame!");
+        }
+    }
+
+    /*
+     *********************************************************
+     *  Show's over, now it's just boring camera stuff etc.  *
+     *********************************************************
+     */
+
+    /**
+     * Set up the cameras and views for each eye and the mirror display.
+     */
+    private void setupCamerasAndViews() {
+        // TODO: Use LobOVR IPD etc
+        if (environment != null) {
+            // get desired frustrum from original camera
+            Camera origCam = environment.getCamera();
+            float fFar = origCam.getFrustumFar();
+            float fNear = origCam.getFrustumNear();
+
+            // restore frustrum on distortion scene cam, if needed
+            if (environment.isInstanceRendering()) {
+                leftCamera = origCam;
+            } else {
+                leftCamera = origCam.clone();
+            }
+
+            OVRFovPort fp = hardware.getFovPort();
+            float hFov = fp.LeftTan() + fp.RightTan();
+            float vFov = fp.UpTan() + fp.DownTan();
+            getLeftCamera().setFrustumPerspective(hFov / FastMath.TWO_PI * 360, vFov / hFov, fNear, fFar);
+
+            prepareCameraSize(getLeftCamera(), 1f);
+            if (environment.getVRHardware() != null) {
+                getLeftCamera().setProjectionMatrix(environment.getVRHardware().getHMDMatrixProjectionLeftEye(getLeftCamera()));
+            }
+            //org.lwjgl.opengl.GL11.glEnable(org.lwjgl.opengl.GL30.GL_FRAMEBUFFER_SRGB);
+
+            if (!environment.isInstanceRendering()) {
+                leftViewPort = setupViewBuffers(getLeftCamera(), LEFT_VIEW_NAME);
+                rightCamera = getLeftCamera().clone();
+                if (environment.getVRHardware() != null) {
+                    getRightCamera().setProjectionMatrix(environment.getVRHardware().getHMDMatrixProjectionRightEye(getRightCamera()));
+                }
+                rightViewPort = setupViewBuffers(getRightCamera(), RIGHT_VIEW_NAME);
+            } else if (environment.getApplication() != null) {
+                throw new UnsupportedOperationException("Not yet implemented!");
+            } else {
+                throw new IllegalStateException("This VR environment is not attached to any application.");
+            }
+
+            // setup gui
+            environment.getVRGUIManager().setupGui(getLeftCamera(), getRightCamera(), getLeftViewPort(), getRightViewPort());
+        } else {
+            throw new IllegalStateException("This VR view manager is not attached to any VR environment.");
+        }
+    }
+
+    private void prepareCameraSize(Camera cam, float xMult) {
+        // TODO this function is identical to that in VRViewManagerOpenVR; merge the two.
+        if (environment != null) {
+            if (environment.getApplication() != null) {
+                Vector2f size = new Vector2f();
+                VRAPI vrhmd = environment.getVRHardware();
+
+                if (vrhmd == null) {
+                    size.x = 1280f;
+                    size.y = 720f;
+                } else {
+                    vrhmd.getRenderSize(size);
+                }
+
+                if (size.x < environment.getApplication().getContext().getSettings().getWidth()) {
+                    size.x = environment.getApplication().getContext().getSettings().getWidth();
+                }
+                if (size.y < environment.getApplication().getContext().getSettings().getHeight()) {
+                    size.y = environment.getApplication().getContext().getSettings().getHeight();
+                }
+
+                if (environment.isInstanceRendering()) {
+                    size.x *= 2f;
+                }
+
+                // other adjustments
+                size.x *= xMult;
+                size.x *= getResolutionMuliplier();
+                size.y *= getResolutionMuliplier();
+
+                if (cam.getWidth() != size.x || cam.getHeight() != size.y) {
+                    cam.resize((int) size.x, (int) size.y, false);
+                }
+            } else {
+                throw new IllegalStateException("This VR environment is not attached to any application.");
+            }
+        } else {
+            throw new IllegalStateException("This VR view manager is not attached to any VR environment.");
+        }
+    }
+
+    private ViewPort setupViewBuffers(Camera cam, String viewName) {
+        // TODO this function is identical to that in VRViewManagerOpenVR; merge the two.
+        if (environment != null) {
+            if (environment.getApplication() != null) {
+                ViewPort viewPort = environment.getApplication().getRenderManager().createPreView(viewName, cam);
+                viewPort.setClearFlags(true, true, true);
+                viewPort.setBackgroundColor(ColorRGBA.Black);
+
+                Iterator<Spatial> spatialIter = environment.getApplication().getViewPort().getScenes().iterator();
+                while (spatialIter.hasNext()) {
+                    viewPort.attachScene(spatialIter.next());
+                }
+
+                // The viewbuffer to render into will be set during prerender.
+                return viewPort;
+            } else {
+                throw new IllegalStateException("This VR environment is not attached to any application.");
+            }
+        } else {
+            throw new IllegalStateException("This VR view manager is not attached to any VR environment.");
+        }
+    }
+}