From 85ab39917c86d7f3f04c032dd92b84a84e1e5e26 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jaakko=20Kera=CC=88nen?= <jaakko.keranen@iki.fi>
Date: Thu, 14 Aug 2014 13:19:31 +0300
Subject: [PATCH] libappfw|VRConfig: Determining if VR mode displaces content
 on screen

---
 doomsday/libappfw/include/de/vr/vrconfig.h | 10 ++++++++++
 doomsday/libappfw/src/vr/vrconfig.cpp      | 18 ++++++++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/doomsday/libappfw/include/de/vr/vrconfig.h b/doomsday/libappfw/include/de/vr/vrconfig.h
index 2c67a27ced..73862412f6 100644
--- a/doomsday/libappfw/include/de/vr/vrconfig.h
+++ b/doomsday/libappfw/include/de/vr/vrconfig.h
@@ -206,6 +206,16 @@ class LIBAPPFW_PUBLIC VRConfig
     de::OculusRift const &oculusRift() const;
 
 public:
+    /**
+     * Determines if the VR mode will be applying a transformation to window contents
+     * that displaces the content from its "actual" location.
+     *
+     * @param mode  Mode.
+     *
+     * @return @c true, if contents will change position on screen.
+     */
+    static bool modeAppliesDisplacement(StereoMode mode);
+
     static bool modeNeedsStereoGLFormat(StereoMode mode);
 
 private:
diff --git a/doomsday/libappfw/src/vr/vrconfig.cpp b/doomsday/libappfw/src/vr/vrconfig.cpp
index 6fce8dcc19..e3f9a7e8a7 100644
--- a/doomsday/libappfw/src/vr/vrconfig.cpp
+++ b/doomsday/libappfw/src/vr/vrconfig.cpp
@@ -246,4 +246,22 @@ OculusRift const &VRConfig::oculusRift() const
     return d->ovr;
 }
 
+bool VRConfig::modeAppliesDisplacement(StereoMode mode)
+{
+    switch(mode)
+    {
+    case Mono:
+    case GreenMagenta:
+    case RedCyan:
+    case LeftOnly:
+    case RightOnly:
+    case QuadBuffered:
+        return false;
+
+    default:
+        break;
+    }
+    return true;
+}
+
 } // namespace de