Fix initial state of view correction, plus overkill

libraries/display-plugins/src/display-plugins/OpenGLDisplayPlugin.cpp

@@ -105,6 +105,12 @@ public:
 
 
     virtual void run() override {
+        // FIXME determine the best priority balance between this and the main thread...
+        // It may be dependent on the display plugin being used, since VR plugins should 
+        // have higher priority on rendering (although we could say that the Oculus plugin
+        // doesn't need that since it has async timewarp).
+        // A higher priority here 
+        setPriority(QThread::HighPriority);
         OpenGLDisplayPlugin* currentPlugin{ nullptr };
         Q_ASSERT(_context);
         while (!_shutdown) {
@@ -302,6 +308,8 @@ void OpenGLDisplayPlugin::customizeContext() {
     Q_ASSERT(thread() == presentThread->thread());
     enableVsync();
 
+    getGLBackend()->setCameraCorrection(mat4());
+
     for (auto& cursorValue : _cursorsData) {
         auto& cursorData = cursorValue.second;
         if (!cursorData.texture) {

libraries/display-plugins/src/display-plugins/hmd/HmdDisplayPlugin.cpp

@@ -118,7 +118,6 @@ void HmdDisplayPlugin::customizeContext() {
 
 void HmdDisplayPlugin::uncustomizeContext() {
     _overlayRenderer = OverlayRenderer();
-    getGLBackend()->setCameraCorrection(mat4());
     Parent::uncustomizeContext();
 }
 

libraries/gpu-gl/src/gpu/gl/GLBackend.h

@@ -338,6 +338,11 @@ protected:
 
         GLState* _state { nullptr };
         bool _invalidState { false };
+
+        PipelineStageState() {
+            _cameraCorrectionBuffer.edit<CameraCorrection>() = CameraCorrection();
+            _cameraCorrectionBuffer._buffer->flush();
+        }
     } _pipeline;
 
     // Synchronize the state cache of this Backend with the actual real state of the GL Context