1 /**************************************************************************
2 * views.hxx -- data structures and routines for managing and view parameters.
4 * Written by Curtis Olson, started August 1997.
6 * Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of the
11 * License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 * (Log is kept at end of this file)
24 **************************************************************************/
32 # error This library requires C++
36 #include <Include/fg_types.h>
37 #include <Flight/flight.h>
38 #include <Math/mat3.h>
39 #include <Time/fg_time.hxx>
40 #include <Time/light.hxx>
43 /* Define a structure containing view information */
45 /* absolute view position */
46 struct fgCartesianPoint abs_view_pos;
48 /* view position translated to scenery.center */
49 struct fgCartesianPoint view_pos;
51 /* cartesion coordinates of current lon/lat if at sea level
52 * translated to scenery.center*/
53 struct fgCartesianPoint cur_zero_elev;
55 /* vector in cartesian coordinates from current position to the
56 * postion on the earth's surface the sun is directly over */
59 /* surface direction to go to head towards sun */
60 MAT3vec surface_to_sun;
62 /* surface vector heading south */
63 MAT3vec surface_south;
65 /* surface vector heading east (used to unambiguously align sky with sun) */
68 /* local up vector (normal to the plane tangent to the earth's
69 * surface at the spot we are directly above */
72 /* up vector for the view (usually point straight up through the
73 * top of the aircraft */
76 /* the vector pointing straight out the nose of the aircraft */
79 /* the current offset from forward for viewing */
82 /* the goal view offset for viewing (used for smooth view changes) */
83 double goal_view_offset;
87 extern fgVIEW current_view;
90 /* Initialize a view structure */
91 void fgViewInit(fgVIEW *v);
93 /* Update the view parameters */
94 void fgViewUpdate(fgFLIGHT *f, fgVIEW *v, fgLIGHT *l);
97 #endif /* _VIEWS_HXX */
101 /* Revision 1.4 1998/04/28 01:20:24 curt
102 /* Type-ified fgTIME and fgVIEW.
103 /* Added a command line option to disable textures.
105 * Revision 1.3 1998/04/25 22:06:31 curt
106 * Edited cvs log messages in source files ... bad bad bad!
108 * Revision 1.2 1998/04/24 00:49:22 curt
109 * Wrapped "#include <config.h>" in "#ifdef HAVE_CONFIG_H"
110 * Trying out some different option parsing code.
111 * Some code reorganization.
113 * Revision 1.1 1998/04/22 13:25:46 curt
114 * C++ - ifing the code.
115 * Starting a bit of reorganization of lighting code.
117 * Revision 1.11 1998/04/21 17:02:42 curt
118 * Prepairing for C++ integration.
120 * Revision 1.10 1998/02/07 15:29:45 curt
121 * Incorporated HUD changes and struct/typedef changes from Charlie Hotchkiss
122 * <chotchkiss@namg.us.anritsu.com>
124 * Revision 1.9 1998/01/29 00:50:29 curt
125 * Added a view record field for absolute x, y, z position.
127 * Revision 1.8 1998/01/27 00:47:58 curt
128 * Incorporated Paul Bleisch's <pbleisch@acm.org> new debug message
129 * system and commandline/config file processing code.
131 * Revision 1.7 1998/01/22 02:59:38 curt
132 * Changed #ifdef FILE_H to #ifdef _FILE_H
134 * Revision 1.6 1998/01/19 19:27:10 curt
135 * Merged in make system changes from Bob Kuehne <rpk@sgi.com>
136 * This should simplify things tremendously.
138 * Revision 1.5 1997/12/22 04:14:32 curt
139 * Aligned sky with sun so dusk/dawn effects can be correct relative to the sun.
141 * Revision 1.4 1997/12/17 23:13:36 curt
142 * Began working on rendering a sky.
144 * Revision 1.3 1997/12/15 23:54:51 curt
145 * Add xgl wrappers for debugging.
146 * Generate terrain normals on the fly.
148 * Revision 1.2 1997/12/10 22:37:48 curt
149 * Prepended "fg" on the name of all global structures that didn't have it yet.
150 * i.e. "struct WEATHER {}" became "struct fgWEATHER {}"
152 * Revision 1.1 1997/08/27 21:31:18 curt