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@flightgear.org
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.
24 #error do not compile me
26 #include <simgear/compiler.h>
32 #include <plib/ssg.h> // plib include
34 #include <simgear/constants.h>
35 #include <simgear/debug/logstream.hxx>
36 #include <simgear/math/point3d.hxx>
37 #include <simgear/math/polar3d.hxx>
38 #include <simgear/math/vector.hxx>
40 #include <Aircraft/aircraft.hxx>
41 #include <Cockpit/panel.hxx>
42 #include <Scenery/scenery.hxx>
44 #include "globals.hxx"
48 // This is a record containing current view parameters for the current
52 // This is a record containing current view parameters for the current
58 FGView::FGView( void ) {
61 #define USE_FAST_VIEWROT
62 #ifdef USE_FAST_VIEWROT
63 // VIEW_ROT = LARC_TO_SSG * ( VIEWo * VIEW_OFFSET )
64 // This takes advantage of the fact that VIEWo and VIEW_OFFSET
65 // only have entries in the upper 3x3 block
66 // and that LARC_TO_SSG is just a shift of rows NHV
67 inline static void fgMakeViewRot( sgMat4 dst, const sgMat4 m1, const sgMat4 m2 )
69 for ( int j = 0 ; j < 3 ; j++ ) {
70 dst[2][j] = m2[0][0] * m1[0][j] +
74 dst[0][j] = m2[1][0] * m1[0][j] +
78 dst[1][j] = m2[2][0] * m1[0][j] +
92 // Initialize a view structure
93 void FGView::Init( void ) {
94 FG_LOG( FG_VIEW, FG_INFO, "Initializing View parameters" );
97 goal_view_offset = 0.0;
98 sgSetVec3( pilot_offset, 0.0, 0.0, 0.0 );
100 winWidth = current_options.get_xsize();
101 winHeight = current_options.get_ysize();
103 set_win_ratio( winHeight / winWidth );
105 #ifndef USE_FAST_VIEWROT
106 // This never changes -- NHV
107 LARC_TO_SSG[0][0] = 0.0;
108 LARC_TO_SSG[0][1] = 1.0;
109 LARC_TO_SSG[0][2] = -0.0;
110 LARC_TO_SSG[0][3] = 0.0;
112 LARC_TO_SSG[1][0] = 0.0;
113 LARC_TO_SSG[1][1] = 0.0;
114 LARC_TO_SSG[1][2] = 1.0;
115 LARC_TO_SSG[1][3] = 0.0;
117 LARC_TO_SSG[2][0] = 1.0;
118 LARC_TO_SSG[2][1] = -0.0;
119 LARC_TO_SSG[2][2] = 0.0;
120 LARC_TO_SSG[2][3] = 0.0;
122 LARC_TO_SSG[3][0] = 0.0;
123 LARC_TO_SSG[3][1] = 0.0;
124 LARC_TO_SSG[3][2] = 0.0;
125 LARC_TO_SSG[3][3] = 1.0;
126 #endif // USE_FAST_VIEWROT
128 force_update_fov_math();
132 #define USE_FAST_LOCAL
133 #ifdef USE_FAST_LOCAL
134 inline static void fgMakeLOCAL( sgMat4 dst, const double Theta,
135 const double Phi, const double Psi)
137 SGfloat cosTheta = (SGfloat) cos(Theta);
138 SGfloat sinTheta = (SGfloat) sin(Theta);
139 SGfloat cosPhi = (SGfloat) cos(Phi);
140 SGfloat sinPhi = (SGfloat) sin(Phi);
141 SGfloat sinPsi = (SGfloat) sin(Psi) ;
142 SGfloat cosPsi = (SGfloat) cos(Psi) ;
144 dst[0][0] = cosPhi * cosTheta;
145 dst[0][1] = sinPhi * cosPsi + cosPhi * -sinTheta * -sinPsi;
146 dst[0][2] = sinPhi * sinPsi + cosPhi * -sinTheta * cosPsi;
149 dst[1][0] = -sinPhi * cosTheta;
150 dst[1][1] = cosPhi * cosPsi + -sinPhi * -sinTheta * -sinPsi;
151 dst[1][2] = cosPhi * sinPsi + -sinPhi * -sinTheta * cosPsi;
152 dst[1][3] = SG_ZERO ;
154 dst[2][0] = sinTheta;
155 dst[2][1] = cosTheta * -sinPsi;
156 dst[2][2] = cosTheta * cosPsi;
167 // Update the view volume, position, and orientation
168 void FGView::UpdateViewParams( const FGInterface& f ) {
171 if ( ! fgPanelVisible() ) {
172 xglViewport(0, 0 , (GLint)(winWidth), (GLint)(winHeight) );
175 int((current_panel->getViewHeight() - current_panel->getYOffset())
176 * (winHeight / 768.0));
177 glViewport(0, (GLint)(winHeight - view_h),
178 (GLint)(winWidth), (GLint)(view_h) );
183 // convert sgMat4 to MAT3 and print
184 static void print_sgMat4( sgMat4 &in) {
186 for ( i = 0; i < 4; i++ ) {
187 for ( j = 0; j < 4; j++ ) {
188 printf("%10.4f ", in[i][j]);
195 // Update the view parameters
196 void FGView::UpdateViewMath( const FGInterface& f ) {
199 sgVec3 v0, minus_z, sgvec, forward;
203 ssgSetFOV( current_options.get_fov(),
204 current_options.get_fov() * win_ratio );
208 scenery.center = scenery.next_center;
210 // printf("scenery center = %.2f %.2f %.2f\n", scenery.center.x,
211 // scenery.center.y, scenery.center.z);
213 // calculate the cartesion coords of the current lat/lon/0 elev
214 p = Point3D( f.get_Longitude(),
215 f.get_Lat_geocentric(),
216 f.get_Sea_level_radius() * FEET_TO_METER );
218 cur_zero_elev = sgPolarToCart3d(p) - scenery.center;
220 // calculate view position in current FG view coordinate system
221 // p.lon & p.lat are already defined earlier, p.radius was set to
222 // the sea level radius, so now we add in our altitude.
223 if ( f.get_Altitude() * FEET_TO_METER >
224 (scenery.cur_elev + 0.5 * METER_TO_FEET) ) {
225 p.setz( p.radius() + f.get_Altitude() * FEET_TO_METER );
227 p.setz( p.radius() + scenery.cur_elev + 0.5 * METER_TO_FEET );
230 abs_view_pos = sgPolarToCart3d(p);
232 view_pos = abs_view_pos - scenery.center;
234 FG_LOG( FG_VIEW, FG_DEBUG, "Polar view pos = " << p );
235 FG_LOG( FG_VIEW, FG_DEBUG, "Absolute view pos = " << abs_view_pos );
236 FG_LOG( FG_VIEW, FG_DEBUG, "Relative view pos = " << view_pos );
238 // code to calculate LOCAL matrix calculated from Phi, Theta, and
239 // Psi (roll, pitch, yaw) in case we aren't running LaRCsim as our
242 #ifdef USE_FAST_LOCAL
244 fgMakeLOCAL( LOCAL, f.get_Theta(), f.get_Phi(), -f.get_Psi() );
246 #else // USE_TEXT_BOOK_METHOD
249 sgSetVec3( rollvec, 0.0, 0.0, 1.0 );
251 sgMakeRotMat4( PHI, f.get_Phi() * RAD_TO_DEG, rollvec );
254 sgSetVec3( pitchvec, 0.0, 1.0, 0.0 );
255 sgMat4 THETA; // pitch
256 sgMakeRotMat4( THETA, f.get_Theta() * RAD_TO_DEG, pitchvec );
260 // sgMultMat4( ROT, PHI, THETA );
261 sgCopyMat4( ROT, PHI );
262 sgPostMultMat4( ROT, THETA );
265 sgSetVec3( yawvec, 1.0, 0.0, 0.0 );
267 sgMakeRotMat4( PSI, -f.get_Psi() * RAD_TO_DEG, yawvec );
270 // sgMultMat4( LOCAL, ROT, PSI );
271 sgCopyMat4( LOCAL, ROT );
272 sgPostMultMat4( LOCAL, PSI );
276 // cout << "LOCAL matrix" << endl;
277 // print_sgMat4( LOCAL );
280 f.get_Longitude() * RAD_TO_DEG,
282 -f.get_Latitude() * RAD_TO_DEG );
284 sgSetVec3( local_up, UP[0][0], UP[0][1], UP[0][2] );
285 // sgXformVec3( local_up, UP );
286 // cout << "Local Up = " << local_up[0] << "," << local_up[1] << ","
287 // << local_up[2] << endl;
289 // Alternative method to Derive local up vector based on
290 // *geodetic* coordinates
291 // alt_up = sgPolarToCart(FG_Longitude, FG_Latitude, 1.0);
292 // printf( " Alt Up = (%.4f, %.4f, %.4f)\n",
293 // alt_up.x, alt_up.y, alt_up.z);
295 // VIEWo = LOCAL * UP
296 // sgMultMat4( VIEWo, LOCAL, UP );
297 sgCopyMat4( VIEWo, LOCAL );
298 sgPostMultMat4( VIEWo, UP );
299 // cout << "VIEWo matrix" << endl;
300 // print_sgMat4( VIEWo );
302 // generate the sg view up and forward vectors
303 sgSetVec3( view_up, VIEWo[0][0], VIEWo[0][1], VIEWo[0][2] );
304 // cout << "view = " << view[0] << ","
305 // << view[1] << "," << view[2] << endl;
306 sgSetVec3( forward, VIEWo[2][0], VIEWo[2][1], VIEWo[2][2] );
307 // cout << "forward = " << forward[0] << ","
308 // << forward[1] << "," << forward[2] << endl;
310 // generate the pilot offset vector in world coordinates
311 sgVec3 pilot_offset_world;
312 sgSetVec3( pilot_offset_world,
313 pilot_offset[2], pilot_offset[1], -pilot_offset[0] );
314 sgXformVec3( pilot_offset_world, pilot_offset_world, VIEWo );
316 // generate the view offset matrix
317 sgMakeRotMat4( VIEW_OFFSET, view_offset * RAD_TO_DEG, view_up );
318 // cout << "VIEW_OFFSET matrix" << endl;
319 // print_sgMat4( VIEW_OFFSET );
320 sgXformVec3( view_forward, forward, VIEW_OFFSET );
321 // cout << "view_forward = " << view_forward[0] << ","
322 // << view_forward[1] << "," << view_forward[2] << endl;
324 // VIEW_ROT = LARC_TO_SSG * ( VIEWo * VIEW_OFFSET )
325 #ifdef USE_FAST_VIEWROT
326 fgMakeViewRot( VIEW_ROT, VIEW_OFFSET, VIEWo );
328 // sgMultMat4( VIEW_ROT, VIEW_OFFSET, VIEWo );
329 // sgPreMultMat4( VIEW_ROT, LARC_TO_SSG );
330 sgCopyMat4( VIEW_ROT, VIEWo );
331 sgPostMultMat4( VIEW_ROT, VIEW_OFFSET );
332 sgPreMultMat4( VIEW_ROT, LARC_TO_SSG );
334 // cout << "VIEW_ROT matrix" << endl;
335 // print_sgMat4( VIEW_ROT );
338 sgSetVec3( trans_vec,
339 view_pos.x() + pilot_offset_world[0],
340 view_pos.y() + pilot_offset_world[1],
341 view_pos.z() + pilot_offset_world[2] );
343 // VIEW = VIEW_ROT * TRANS
344 sgCopyMat4( VIEW, VIEW_ROT );
345 sgPostMultMat4ByTransMat4( VIEW, trans_vec );
347 //!!!!!!!!!!!!!!!!!!!
348 // THIS IS THE EXPERIMENTAL VIEWING ANGLE SHIFTER
349 // THE MAJORITY OF THE WORK IS DONE IN GUI.CXX
350 // this in gui.cxx for now just testing
351 extern float quat_mat[4][4];
352 sgPreMultMat4( VIEW, quat_mat);
353 // !!!!!!!!!! testing
355 // make a vector to the current view position
356 sgSetVec3( v0, view_pos.x(), view_pos.y(), view_pos.z() );
358 // Given a vector pointing straight down (-Z), map into onto the
359 // local plane representing "horizontal". This should give us the
360 // local direction for moving "south".
361 sgSetVec3( minus_z, 0.0, 0.0, -1.0 );
363 sgmap_vec_onto_cur_surface_plane(local_up, v0, minus_z, surface_south);
364 sgNormalizeVec3(surface_south);
365 // cout << "Surface direction directly south " << surface_south[0] << ","
366 // << surface_south[1] << "," << surface_south[2] << endl;
368 // now calculate the surface east vector
369 #define USE_FAST_SURFACE_EAST
370 #ifdef USE_FAST_SURFACE_EAST
372 sgNegateVec3(local_down, local_up);
373 sgVectorProductVec3(surface_east, surface_south, local_down);
377 sgMakeRotMat4( TMP, FG_PI_2 * RAD_TO_DEG, local_up );
379 sgMakeRotMat4( TMP, FG_PI_2 * RAD_TO_DEG, view_up );
380 #endif // USE_LOCAL_UP
381 // cout << "sgMat4 TMP" << endl;
382 // print_sgMat4( TMP );
383 sgXformVec3(surface_east, surface_south, TMP);
384 #endif // USE_FAST_SURFACE_EAST
385 // cout << "Surface direction directly east " << surface_east[0] << ","
386 // << surface_east[1] << "," << surface_east[2] << endl;
387 // cout << "Should be close to zero = "
388 // << sgScalarProductVec3(surface_south, surface_east) << endl;
392 void FGView::CurrentNormalInLocalPlane(sgVec3 dst, sgVec3 src) {
394 sgSetVec3(tmp, src[0], src[1], src[2] );
396 sgTransposeNegateMat4 ( TMP, UP ) ;
397 sgXformVec3(tmp, tmp, TMP);
398 sgSetVec3(dst, tmp[2], tmp[1], tmp[0] );
403 FGView::~FGView( void ) {