From 4ce05dd0cad78f5ed5395bfd210ccd237802f53a Mon Sep 17 00:00:00 2001
From: Campbell Suter <znix@znix.xyz>
Date: Thu, 28 Sep 2017 12:51:27 +1300
Subject: [PATCH] Add pre-render method to VRViewManager in preparation for
 adding Oculus Rift support. See
 https://hub.jmonkeyengine.org/t/libovr-oculus-rift-support/39427

---
 jme3-vr/src/main/java/com/jme3/app/VRAppState.java     | 10 ++++++++++
 .../main/java/com/jme3/util/AbstractVRViewManager.java |  4 ++++
 jme3-vr/src/main/java/com/jme3/util/VRViewManager.java |  6 ++++++
 3 files changed, 20 insertions(+)

diff --git a/jme3-vr/src/main/java/com/jme3/app/VRAppState.java b/jme3-vr/src/main/java/com/jme3/app/VRAppState.java
index a468e71b9..39df3884b 100644
--- a/jme3-vr/src/main/java/com/jme3/app/VRAppState.java
+++ b/jme3-vr/src/main/java/com/jme3/app/VRAppState.java
@@ -432,6 +432,16 @@ 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);
diff --git a/jme3-vr/src/main/java/com/jme3/util/AbstractVRViewManager.java b/jme3-vr/src/main/java/com/jme3/util/AbstractVRViewManager.java
index f4f7e7f91..6c664dd59 100644
--- a/jme3-vr/src/main/java/com/jme3/util/AbstractVRViewManager.java
+++ b/jme3-vr/src/main/java/com/jme3/util/AbstractVRViewManager.java
@@ -128,6 +128,10 @@ public abstract class AbstractVRViewManager implements VRViewManager {
     public VREnvironment getVREnvironment(){
     	return environment;
     }
+
+    @Override
+    public void render() {
+    }
     
     /**
      * Handles moving filters from the main view to each eye
diff --git a/jme3-vr/src/main/java/com/jme3/util/VRViewManager.java b/jme3-vr/src/main/java/com/jme3/util/VRViewManager.java
index 58a6c166e..1a5eaeb75 100644
--- a/jme3-vr/src/main/java/com/jme3/util/VRViewManager.java
+++ b/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