osgviewer mouse warp fixes

After a mouse warp drop all pointer motion events for the entire frame.

Author: Melchior FRANZ

src/Main/FGManipulator.cxx

@@ -13,7 +13,7 @@
 FGManipulator::FGManipulator() :
     idleHandler(0), drawHandler(0), windowResizeHandler(0), keyHandler(0),
     mouseClickHandler(0), mouseMotionHandler(0), currentModifiers(0),
-    osgModifiers(0), resizable(true)
+    osgModifiers(0), resizable(true), mouseWarped(false)
 {
     using namespace osgGA;
     
@@ -132,6 +132,7 @@ bool FGManipulator::handle(const osgGA::GUIEventAdapter& ea,
 	    (*idleHandler)();
 	if (drawHandler)
 	    (*drawHandler)();
+	mouseWarped = false;
 	return true;
     case osgGA::GUIEventAdapter::KEYDOWN:
     case osgGA::GUIEventAdapter::KEYUP:
@@ -167,6 +168,12 @@ bool FGManipulator::handle(const osgGA::GUIEventAdapter& ea,
     }
     case osgGA::GUIEventAdapter::MOVE:
     case osgGA::GUIEventAdapter::DRAG:
+        // If we warped the mouse, then disregard all pointer motion
+        // events for this frame. We really want to flush the event
+        // queue of mouse events, but don't have the ability to do
+        // that with osgViewer.
+	if (mouseWarped)
+	    return true;
 	eventToViewport(ea, us, x, y);
 	if (mouseMotionHandler)
 	    (*mouseMotionHandler)(x, y);

src/Main/FGManipulator.hxx

@@ -103,6 +103,12 @@ public:
 	{
 	    return currentModifiers;
 	}
+
+    void setMouseWarped()
+	{
+	    mouseWarped = true;
+	}
+
     void setPosition(const osg::Vec3d position) { this->position = position; }
     void setAttitude(const osg::Quat attitude) { this->attitude = attitude; }
 
@@ -130,5 +136,6 @@ protected:
     osg::Quat attitude;
     void handleKey(const osgGA::GUIEventAdapter& ea, int& key, int& modifiers);
     bool resizable;
+    bool mouseWarped;
 };
 #endif

src/Main/fg_os_osgviewer.cxx

@@ -250,6 +250,7 @@ int fgGetKeyModifiers()
 
 void fgWarpMouse(int x, int y)
 {
+    globals->get_renderer()->getManipulator()->setMouseWarped();
     // Hack, currently the pointer is just recentered. So, we know the
     // relative coordinates ...
     if (!mainCamera.valid()) {
@@ -260,7 +261,6 @@ void fgWarpMouse(int x, int y)
     float ysize = (float)mainCamera->getGraphicsContext()->getTraits()->height;
     viewer->requestWarpPointer(2.0f * (float)x / xsize - 1.0f,
                                1.0f - 2.0f * (float)y / ysize);
-    
 }
 
 // Noop