Improve timing statistics

[flightgear.git] / src / Main / viewer.cxx

diff --git a/src/Main/viewer.cxx b/src/Main/viewer.cxx
index d7b51d859cbf3bbdc7d709d7772fd7201bf9a4f3..57e60f48110007c8eff18f06cd0f8fc05f2271b9 100644 (file)
--- a/src/Main/viewer.cxx
+++ b/src/Main/viewer.cxx
@@ -28,6 +28,7 @@
 #endif
 
 #include <simgear/compiler.h>
+#include <cassert>
 
 #include "fg_props.hxx"
 
@@ -288,7 +289,14 @@ void
 FGViewer::setHeadingOffset_deg (double heading_offset_deg)
 {
   _dirty = true;
-  _heading_offset_deg = heading_offset_deg;
+  if (_at_model && (_offset_m.x() == 0.0)&&(_offset_m.z() == 0.0))
+  {
+      /* avoid optical effects (e.g. rotating sky) when "looking at" with
+       * heading offsets x==z==0 (view heading cannot change). */
+      _heading_offset_deg = 0.0;
+  }
+  else
+      _heading_offset_deg = heading_offset_deg;
 }
 
 void
@@ -316,6 +324,14 @@ void
 FGViewer::setGoalHeadingOffset_deg (double goal_heading_offset_deg)
 {
   _dirty = true;
+  if (_at_model && (_offset_m.x() == 0.0)&&(_offset_m.z() == 0.0))
+  {
+      /* avoid optical effects (e.g. rotating sky) when "looking at" with
+       * heading offsets x==z==0 (view heading cannot change). */
+      _goal_heading_offset_deg = 0.0;
+      return;
+  }
+  
   _goal_heading_offset_deg = goal_heading_offset_deg;
   while ( _goal_heading_offset_deg < 0.0 ) {
     _goal_heading_offset_deg += 360;
@@ -650,6 +666,8 @@ FGViewer::update (double dt)
     }
   }
   recalc();
-  _cameraGroup->update(toOsg(_absolute_view_pos), toOsg(mViewOrientation));
-  _cameraGroup->setCameraParameters(get_v_fov(), get_aspect_ratio());
+  if( fgGetBool( "/sim/rendering/draw-otw", true ) ) {
+    _cameraGroup->update(toOsg(_absolute_view_pos), toOsg(mViewOrientation));
+    _cameraGroup->setCameraParameters(get_v_fov(), get_aspect_ratio());
+  }
 }