Compile AI wake numerical core in FG main executable.

AI wake code is still dead code except that it is now compiled with FG.

Input data for wake computations are extracted from the performance database. The data must be specified as follows (values are for illustration only) :
<geometry>
  <wing>
    <span-ft> 100. </span-ft>
    <chord-ft> 12. <chord-ft>
  </wing>
  <weight-lbs> 90000. </weight-lbs>
</geometry>

src/AIModel/performancedata.cxx

@@ -69,6 +69,9 @@ void PerformanceData::initFromProps(SGPropertyNode *db_node)
   _vApproach    = db_node->getDoubleValue("approach-speed-kts", _vApproach);
   _vTouchdown   = db_node->getDoubleValue("touchdown-speed-kts", _vTouchdown);
   _vTaxi        = db_node->getDoubleValue("taxi-speed-kts", _vTaxi);
+  _wingSpan     = db_node->getDoubleValue("geometry/wing/span-ft", 100.);
+  _wingChord    = db_node->getDoubleValue("geometry/wing/chord-ft", 12.);
+  _weight       = db_node->getDoubleValue("geometry/weight-lbs", 90000.);
 }
 
 double PerformanceData::actualSpeed(FGAIAircraft* ac, double tgt_speed, double dt, bool maxBrakes) {

src/AIModel/performancedata.hxx

@@ -45,6 +45,9 @@ public:
     inline double vApproach        () { return _vApproach; };
     inline double vTouchdown       () { return _vTouchdown; };
     inline double vCruise          () { return _vCruise; };
+    inline double wingSpan         () { return _wingSpan; };
+    inline double wingChord        () { return _wingChord; };
+    inline double weight           () { return _weight; };
     
     double decelerationOnGround() const;
 private:
@@ -63,6 +66,11 @@ private:
 
     double _rollrate;
     double _maxbank;
+
+    // Data for aerodynamic wake computation
+    double _wingSpan;
+    double _wingChord;
+    double _weight;
 };
 
 #endif

src/FDM/AIWake/AircraftMesh.cxx

@@ -31,10 +31,10 @@
 #include <simgear/math/SGQuat.hxx>
 #include "AircraftMesh.hxx"
 #include <FDM/flight.hxx>
+#include "AIWakeGroup.hxx"
 #ifndef FG_TESTLIB
 #include "AIModel/AIAircraft.hxx"
 #else
-#include "AIWakeGroup.hxx"
 #include "fakeAIAircraft.hxx"
 #endif
 extern "C" {

src/FDM/CMakeLists.txt

@@ -112,7 +112,6 @@ set(LARCSIM_SOURCES
     ls_gravity.c
     ls_init.c
     ls_interface.c
-    ls_matrix.c
     ls_model.c
     ls_step.c
     navion_aero.c
@@ -136,6 +135,11 @@ set(SOURCES
 	${SP_FDM_SOURCES}
 	ExternalNet/ExternalNet.cxx
 	ExternalPipe/ExternalPipe.cxx
+        AIWake/AircraftMesh.cxx
+        AIWake/WakeMesh.cxx
+        AIWake/AeroElement.cxx
+        AIWake/AIWakeGroup.cxx
+        LaRCsim/ls_matrix.c
 	)
 
 if(ENABLE_UIUC_MODEL)