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)
31 # error This library requires C++
35 #include <Include/fg_types.h>
36 #include <Flight/flight.h>
37 #include <Math/mat3.h>
38 #include <Time/fg_time.hxx>
39 #include <Time/light.hxx>
42 // Define a structure containing view information
47 // the current offset from forward for viewing
50 // the goal view offset for viewing (used for smooth view changes)
51 double goal_view_offset;
53 // fov of view is specified in the y direction, win_ratio is used to
54 // calculate the fov in the X direction = width/height
57 // width & height of window
58 int winWidth, winHeight;
60 // sin and cos of (fov / 2) in Y axis
61 double sin_fov_y, cos_fov_y;
63 // slope of view frustum edge in eye space Y axis
66 // sin and cos of (fov / 2) in X axis
67 double sin_fov_x, cos_fov_x;
69 // slope of view frustum edge in eye space X axis
72 // View frustum cull ratio (% of tiles culled ... used for
73 // reporting purposes)
76 // absolute view position
77 fgCartesianPoint3d abs_view_pos;
79 // view position translated to scenery.center
80 fgCartesianPoint3d view_pos;
82 // cartesion coordinates of current lon/lat if at sea level
83 // translated to scenery.center*/
84 fgCartesianPoint3d cur_zero_elev;
86 // vector in cartesian coordinates from current position to the
87 // postion on the earth's surface the sun is directly over
90 // surface direction to go to head towards sun
91 MAT3vec surface_to_sun;
93 // surface vector heading south
94 MAT3vec surface_south;
96 // surface vector heading east (used to unambiguously align sky
100 // local up vector (normal to the plane tangent to the earth's
101 // surface at the spot we are directly above
104 // up vector for the view (usually point straight up through the
105 // top of the aircraft
108 // the vector pointing straight out the nose of the aircraft
109 MAT3vec view_forward;
111 // Transformation matrix for eye coordinates to aircraft coordinates
114 // Transformation matrix for aircraft coordinates to world
118 // Combined transformation from eye coordinates to world coordinates
119 MAT3mat EYE_TO_WORLD;
121 // Inverse of EYE_TO_WORLD which is a transformation from world
122 // coordinates to eye coordinates
123 MAT3mat WORLD_TO_EYE;
128 // Initialize a view class
131 // Update the view parameters
132 void Update( fgFLIGHT *f );
134 // Update the "World to Eye" transformation matrix
135 void UpdateWorldToEye( fgFLIGHT *f );
142 extern fgVIEW current_view;
149 // Revision 1.7 1998/05/17 16:59:04 curt
150 // First pass at view frustum culling now operational.
152 // Revision 1.6 1998/05/16 13:08:37 curt
153 // C++ - ified views.[ch]xx
154 // Shuffled some additional view parameters into the fgVIEW class.
155 // Changed tile-radius to tile-diameter because it is a much better
157 // Added a WORLD_TO_EYE transformation to views.cxx. This allows us
158 // to transform world space to eye space for view frustum culling.
160 // Revision 1.5 1998/05/02 01:51:02 curt
161 // Updated polartocart conversion routine.
163 // Revision 1.4 1998/04/28 01:20:24 curt
164 // Type-ified fgTIME and fgVIEW.
165 // Added a command line option to disable textures.
167 // Revision 1.3 1998/04/25 22:06:31 curt
168 // Edited cvs log messages in source files ... bad bad bad!
170 // Revision 1.2 1998/04/24 00:49:22 curt
171 // Wrapped "#include <config.h>" in "#ifdef HAVE_CONFIG_H"
172 // Trying out some different option parsing code.
173 // Some code reorganization.
175 // Revision 1.1 1998/04/22 13:25:46 curt
176 // C++ - ifing the code.
177 // Starting a bit of reorganization of lighting code.
179 // Revision 1.11 1998/04/21 17:02:42 curt
180 // Prepairing for C++ integration.
182 // Revision 1.10 1998/02/07 15:29:45 curt
183 // Incorporated HUD changes and struct/typedef changes from Charlie Hotchkiss
184 // <chotchkiss@namg.us.anritsu.com>
186 // Revision 1.9 1998/01/29 00:50:29 curt
187 // Added a view record field for absolute x, y, z position.
189 // Revision 1.8 1998/01/27 00:47:58 curt
190 // Incorporated Paul Bleisch's <pbleisch@acm.org> new debug message
191 // system and commandline/config file processing code.
193 // Revision 1.7 1998/01/22 02:59:38 curt
194 // Changed #ifdef FILE_H to #ifdef _FILE_H
196 // Revision 1.6 1998/01/19 19:27:10 curt
197 // Merged in make system changes from Bob Kuehne <rpk@sgi.com>
198 // This should simplify things tremendously.
200 // Revision 1.5 1997/12/22 04:14:32 curt
201 // Aligned sky with sun so dusk/dawn effects can be correct relative to the sun.
203 // Revision 1.4 1997/12/17 23:13:36 curt
204 // Began working on rendering a sky.
206 // Revision 1.3 1997/12/15 23:54:51 curt
207 // Add xgl wrappers for debugging.
208 // Generate terrain normals on the fly.
210 // Revision 1.2 1997/12/10 22:37:48 curt
211 // Prepended "fg" on the name of all global structures that didn't have it yet.
212 // i.e. "struct WEATHER {}" became "struct fgWEATHER {}"
214 // Revision 1.1 1997/08/27 21:31:18 curt