Initial revision. Things are just beginning to be stubbed in now.

src/Objects/Makefile.am

@@ -2,6 +2,7 @@ noinst_LIBRARIES = libObjects.a
 
 libObjects_a_SOURCES = \
 	apt_signs.cxx apt_signs.hxx \
+	dir_lights.cxx dir_lights.hxx \
 	newmat.cxx newmat.hxx \
 	matlib.cxx matlib.hxx \
 	obj.cxx obj.hxx \

src/Objects/dir_lights.cxx

@@ -0,0 +1,29 @@
+// dir_lights.cxx -- build a 'directional' light on the fly
+//
+// Written by Curtis Olson, started March 2002.
+//
+// Copyright (C) 2002  Curtis L. Olson  - curt@flightgear.org
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation; either version 2 of the
+// License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+//
+// $Id$
+
+
+#include "dir_lights.hxx"
+
+
+// Generate a directional light
+ssgLeaf *gen_directional_light( sgVec3 pt, sgVec3 dir ) {
+}

src/Objects/dir_lights.hxx

@@ -0,0 +1,92 @@
+// dir_lights.hxx -- build a 'directional' light on the fly
+//
+// Written by Curtis Olson, started March 2002.
+//
+// Copyright (C) 2002  Curtis L. Olson  - curt@flightgear.org
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation; either version 2 of the
+// License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+//
+// $Id$
+
+
+#ifndef _DIR_LIGHTS_HXX
+#define _DIR_LIGHTS_HXX
+
+
+#ifndef __cplusplus                                                          
+# error This library requires C++
+#endif                                   
+
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#include <simgear/compiler.h>
+
+#include STL_STRING
+
+#include <plib/ssg.h>		// plib include
+
+SG_USING_STD(string);
+
+
+// Define the various supported light types
+enum {
+    FG_RWYLIGHT_TAXI = 0,
+    FG_RWYLIGHT_VASI,
+    FG_RWYLIGHT_EDGE,
+    FG_RWYLIGHT_TOUCHDOWN,
+    FG_RWYLIGHT_THRESHOLD,
+    FG_RWYLIGHT_WHITE,
+    FG_RWYLIGHT_RED,
+    FG_RWYLIGHT_GREEN,
+    FG_RWYLIGHT_YELLOW
+} fgRunwayLightType;
+
+
+// Generate a directional light.  This routines creates a
+// 'directional' light that can only be viewed from within 90 degrees
+// of the specified dir vector.
+
+// To accomplish this, he routine creates a triangle with the 1st
+// point coincident with the specified pt and the 2nd and 3rd points
+// extending upward.  The 1st point is created with an 'alpha' value
+// of 1 while the 2nd and 3rd points are created with an 'alpha' of
+// 0.0.
+
+// If the triangle is drawn in glPolygonMode(GL_FRONT, GL_POINT) mode,
+// then two important things happen:
+
+// 1) Only the 3 vertex points are drawn, the 2nd two with an alpha of
+// 0 so actually only the desired point is rendered.
+
+// 2) since we are drawing a triangle, back face culling takes care of
+// eliminating this poing when the view angle relative to dir is
+// greater than 90 degrees.
+
+// The final piece of this puzzle is that if we now use environment
+// mapping on this point, via an appropriate texture we can then
+// control the intensity and color of the point based on the view
+// angle relative to 'dir' the optimal view direction of the light
+// (i.e. the direction the light is pointing.)
+
+// Yes this get's to be long and convoluted.  If you can suggest a
+// simpler way, please do! :-)
+
+ssgLeaf *gen_directional_light( sgVec3 pt, sgVec3 dir );
+
+
+#endif // _DIR_LIGHTS_HXX

src/Objects/matlib.cxx

@@ -218,5 +218,3 @@ void FGMaterialLib::load_next_deferred() {
 	  return;
     }
 }
-
-