add conditional FO4 decal/depth fix for OC/WMR

Author: eksuri

XR_APILAYER_MBUCCHIA_toolkit/layer.cpp

@@ -496,6 +496,10 @@ namespace {
 
                 m_supportMotionReprojectionLock = isWMR;
 
+                // Fix Fallout 4 / OpenComposite Decal Issue for WMR
+                m_overrideParallelProjection =
+                    m_applicationName == "OpenComposite_Fallout4VR" && isWMR;
+
                 // Workaround: the Vive runtime does not seem to properly convert timestamps. We disable any feature
                 // depending on timestamps conversion.
                 m_hasPerformanceCounterKHR = !isVive;
@@ -1719,6 +1723,14 @@ namespace {
                 m_posesForFrame[0].pose = views[0].pose;
                 m_posesForFrame[1].pose = views[1].pose;
 
+                // Fix Fallout 4 / OpenComposite Decal Issue for WMR
+                if (m_overrideParallelProjection) {
+                    views[0].pose.orientation.w = views[1].pose.orientation.w;
+                    views[0].pose.orientation.x = views[1].pose.orientation.x;
+                    views[0].pose.orientation.y = views[1].pose.orientation.y;
+                    views[0].pose.orientation.z = views[1].pose.orientation.z;
+                }
+
                 // Override the canting angle if requested.
                 const int cantOverride = m_configManager->getValue("canting");
                 if (cantOverride != 0) {
@@ -3402,6 +3414,7 @@ namespace {
         bool m_hasPimaxEyeTracker{false};
         bool m_isFrameThrottlingPossible{true};
         bool m_overrideFoveatedRenderingCapability{false};
+        bool m_overrideParallelProjection{false};
 
         std::mutex m_frameLock;
         XrTime m_waitedFrameTime;