1 // views.cxx -- data structures and routines for managing and view
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.
29 #include <ssg.h> // plib include
31 #include <Aircraft/aircraft.hxx>
32 #include <Cockpit/panel.hxx>
33 #include <Debug/logstream.hxx>
34 #include <Include/fg_constants.h>
35 #include <Math/point3d.hxx>
36 #include <Math/polar3d.hxx>
37 #include <Math/vector.hxx>
38 #include <Scenery/scenery.hxx>
39 #include <Time/fg_time.hxx>
41 #include "options.hxx"
45 // temporary (hopefully) hack
46 static int panel_hist = 0;
49 // This is a record containing current view parameters for the current
53 // This is a record containing current view parameters for the current
59 FGView::FGView( void ) {
63 // Initialize a view structure
64 void FGView::Init( void ) {
65 FG_LOG( FG_VIEW, FG_INFO, "Initializing View parameters" );
68 goal_view_offset = 0.0;
70 winWidth = current_options.get_xsize();
71 winHeight = current_options.get_ysize();
73 if ( ! current_options.get_panel_status() ) {
74 current_view.set_win_ratio( (GLfloat) winWidth / (GLfloat) winHeight );
76 current_view.set_win_ratio( (GLfloat) winWidth /
77 ((GLfloat) (winHeight)*0.4232) );
80 // This never changes -- NHV
81 LARC_TO_SSG[0][0] = 0.0;
82 LARC_TO_SSG[0][1] = 1.0;
83 LARC_TO_SSG[0][2] = -0.0;
84 LARC_TO_SSG[0][3] = 0.0;
86 LARC_TO_SSG[1][0] = 0.0;
87 LARC_TO_SSG[1][1] = 0.0;
88 LARC_TO_SSG[1][2] = 1.0;
89 LARC_TO_SSG[1][3] = 0.0;
91 LARC_TO_SSG[2][0] = 1.0;
92 LARC_TO_SSG[2][1] = -0.0;
93 LARC_TO_SSG[2][2] = 0.0;
94 LARC_TO_SSG[2][3] = 0.0;
96 LARC_TO_SSG[3][0] = 0.0;
97 LARC_TO_SSG[3][1] = 0.0;
98 LARC_TO_SSG[3][2] = 0.0;
99 LARC_TO_SSG[3][3] = 1.0;
101 force_update_fov_math();
104 // Update the view volume, position, and orientation
105 void FGView::UpdateViewParams( const FGInterface& f ) {
108 if ((current_options.get_panel_status() != panel_hist) && (current_options.get_panel_status()))
110 FGPanel::OurPanel->ReInit( 0, 0, 1024, 768);
113 if ( ! current_options.get_panel_status() ) {
114 xglViewport(0, 0 , (GLint)(winWidth), (GLint)(winHeight) );
116 xglViewport(0, (GLint)((winHeight)*0.5768), (GLint)(winWidth),
117 (GLint)((winHeight)*0.4232) );
120 panel_hist = current_options.get_panel_status();
124 // convert sgMat4 to MAT3 and print
125 static void print_sgMat4( sgMat4 &in) {
127 for ( i = 0; i < 4; i++ ) {
128 for ( j = 0; j < 4; j++ ) {
129 printf("%10.4f ", in[i][j]);
136 // Update the view parameters
137 void FGView::UpdateViewMath( const FGInterface& f ) {
139 sgVec3 v0, minus_z, sgvec, forward;
143 ssgSetFOV( current_options.get_fov(),
144 current_options.get_fov() * win_ratio );
148 scenery.center = scenery.next_center;
150 // printf("scenery center = %.2f %.2f %.2f\n", scenery.center.x,
151 // scenery.center.y, scenery.center.z);
153 // calculate the cartesion coords of the current lat/lon/0 elev
154 p = Point3D( f.get_Longitude(),
155 f.get_Lat_geocentric(),
156 f.get_Sea_level_radius() * FEET_TO_METER );
158 cur_zero_elev = fgPolarToCart3d(p) - scenery.center;
160 // calculate view position in current FG view coordinate system
161 // p.lon & p.lat are already defined earlier, p.radius was set to
162 // the sea level radius, so now we add in our altitude.
163 if ( f.get_Altitude() * FEET_TO_METER >
164 (scenery.cur_elev + 0.5 * METER_TO_FEET) ) {
165 p.setz( p.radius() + f.get_Altitude() * FEET_TO_METER );
167 p.setz( p.radius() + scenery.cur_elev + 0.5 * METER_TO_FEET );
170 abs_view_pos = fgPolarToCart3d(p);
172 view_pos = abs_view_pos - scenery.center;
174 FG_LOG( FG_VIEW, FG_DEBUG, "Polar view pos = " << p );
175 FG_LOG( FG_VIEW, FG_DEBUG, "Absolute view pos = " << abs_view_pos );
176 FG_LOG( FG_VIEW, FG_DEBUG, "Relative view pos = " << view_pos );
178 // code to calculate LOCAL matrix calculated from Phi, Theta, and
179 // Psi (roll, pitch, yaw) in case we aren't running LaRCsim as our
183 sgSetVec3( rollvec, 0.0, 0.0, 1.0 );
185 sgMakeRotMat4( PHI, f.get_Phi() * RAD_TO_DEG, rollvec );
188 sgSetVec3( pitchvec, 0.0, 1.0, 0.0 );
189 sgMat4 THETA; // pitch
190 sgMakeRotMat4( THETA, f.get_Theta() * RAD_TO_DEG, pitchvec );
193 sgMultMat4( ROT, PHI, THETA );
196 sgSetVec3( yawvec, 1.0, 0.0, 0.0 );
198 sgMakeRotMat4( PSI, -f.get_Psi() * RAD_TO_DEG, yawvec );
200 sgMultMat4( LOCAL, ROT, PSI );
201 // cout << "LOCAL matrix" << endl;
202 // print_sgMat4( LOCAL );
205 f.get_Longitude() * RAD_TO_DEG,
207 -f.get_Latitude() * RAD_TO_DEG );
209 sgSetVec3( local_up, 1.0, 0.0, 0.0 );
210 sgXformVec3( local_up, UP );
211 // cout << "Local Up = " << local_up[0] << "," << local_up[1] << ","
212 // << local_up[2] << endl;
214 // Alternative method to Derive local up vector based on
215 // *geodetic* coordinates
216 // alt_up = fgPolarToCart(FG_Longitude, FG_Latitude, 1.0);
217 // printf( " Alt Up = (%.4f, %.4f, %.4f)\n",
218 // alt_up.x, alt_up.y, alt_up.z);
221 sgMultMat4( VIEWo, LOCAL, UP );
222 // cout << "VIEWo matrix" << endl;
223 // print_sgMat4( VIEWo );
225 // generate the sg view up vector
227 sgSetVec3( vec1, 1.0, 0.0, 0.0 );
228 sgXformVec3( view_up, vec1, VIEWo );
230 // generate the view offset matrix
231 sgMakeRotMat4( VIEW_OFFSET, view_offset * RAD_TO_DEG, view_up );
232 // cout << "VIEW_OFFSET matrix" << endl;
233 // print_sgMat4( VIEW_OFFSET );
235 sgMultMat4( TMP2, VIEWo, VIEW_OFFSET );
236 sgMultMat4( VIEW_ROT, LARC_TO_SSG, TMP2 );
237 // cout << "VIEW_ROT matrix" << endl;
238 // print_sgMat4( VIEW_ROT );
240 sgMakeTransMat4( TRANS, view_pos.x(), view_pos.y(), view_pos.z() );
242 sgMultMat4( VIEW, VIEW_ROT, TRANS );
244 sgSetVec3( sgvec, 0.0, 0.0, 1.0 );
245 sgXformVec3( forward, sgvec, VIEWo );
246 // cout << "forward = " << forward[0] << ","
247 // << forward[1] << "," << forward[2] << endl;
249 sgMakeRotMat4( TMP, view_offset * RAD_TO_DEG, view_up );
250 sgXformVec3( view_forward, forward, TMP );
251 // cout << "view_forward = " << view_forward[0] << ","
252 // << view_forward[1] << "," << view_forward[2] << endl;
254 // make a vector to the current view position
255 sgSetVec3( v0, view_pos.x(), view_pos.y(), view_pos.z() );
257 // Given a vector pointing straight down (-Z), map into onto the
258 // local plane representing "horizontal". This should give us the
259 // local direction for moving "south".
260 sgSetVec3( minus_z, 0.0, 0.0, -1.0 );
262 sgmap_vec_onto_cur_surface_plane(local_up, v0, minus_z, surface_south);
263 sgNormalizeVec3(surface_south);
264 // cout << "Surface direction directly south " << surface_south[0] << ","
265 // << surface_south[1] << "," << surface_south[2] << endl;
267 // now calculate the surface east vector
268 sgMakeRotMat4( TMP, FG_PI_2 * RAD_TO_DEG, view_up );
269 // cout << "sgMat4 TMP" << endl;
270 // print_sgMat4( TMP );
271 sgXformVec3(surface_east, surface_south, TMP);
272 // cout << "Surface direction directly east" << surface_east[0] << ","
273 // << surface_east[1] << "," << surface_east[2] << endl;
274 // cout << "Should be close to zero = "
275 // << sgScalarProductVec3(surface_south, surface_east) << endl;
280 FGView::~FGView( void ) {