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flightgear/src/Main/viewer.cxx

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// viewer.cxx -- class for managing a viewer in the flightgear world.
//
// Written by Curtis Olson, started August 1997.
// overhaul started October 2000.
//
// Copyright (C) 1997 - 2000 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 <simgear/compiler.h>
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <plib/ssg.h> // plib include
#include <simgear/constants.h>
#include <simgear/debug/logstream.hxx>
#include <simgear/math/point3d.hxx>
#include <simgear/math/polar3d.hxx>
#include <simgear/math/vector.hxx>
#include <Aircraft/aircraft.hxx>
#include <Cockpit/panel.hxx>
#include <Scenery/scenery.hxx>
#include "options.hxx"
#include "viewer.hxx"
// Constructor
FGViewer::FGViewer( void ) {
}
#define USE_FAST_VIEWROT
#ifdef USE_FAST_VIEWROT
// VIEW_ROT = LARC_TO_SSG * ( VIEWo * VIEW_OFFSET )
// This takes advantage of the fact that VIEWo and VIEW_OFFSET
// only have entries in the upper 3x3 block
// and that LARC_TO_SSG is just a shift of rows NHV
inline static void fgMakeViewRot( sgMat4 dst, const sgMat4 m1, const sgMat4 m2 )
{
for ( int j = 0 ; j < 3 ; j++ ) {
dst[2][j] = m2[0][0] * m1[0][j] +
m2[0][1] * m1[1][j] +
m2[0][2] * m1[2][j];
dst[0][j] = m2[1][0] * m1[0][j] +
m2[1][1] * m1[1][j] +
m2[1][2] * m1[2][j];
dst[1][j] = m2[2][0] * m1[0][j] +
m2[2][1] * m1[1][j] +
m2[2][2] * m1[2][j];
}
dst[0][3] =
dst[1][3] =
dst[2][3] =
dst[3][0] =
dst[3][1] =
dst[3][2] = SG_ZERO;
dst[3][3] = SG_ONE;
}
#endif
// Initialize a view structure
void FGViewer::Init( void ) {
FG_LOG( FG_VIEW, FG_INFO, "Initializing View parameters" );
view_offset = goal_view_offset = globals->get_options()->get_default_view_offset();
sgSetVec3( pilot_offset, 0.0, 0.0, 0.0 );
winWidth = globals->get_options()->get_xsize();
winHeight = globals->get_options()->get_ysize();
set_win_ratio( winHeight / winWidth );
#ifndef USE_FAST_VIEWROT
// This never changes -- NHV
LARC_TO_SSG[0][0] = 0.0;
LARC_TO_SSG[0][1] = 1.0;
LARC_TO_SSG[0][2] = -0.0;
LARC_TO_SSG[0][3] = 0.0;
LARC_TO_SSG[1][0] = 0.0;
LARC_TO_SSG[1][1] = 0.0;
LARC_TO_SSG[1][2] = 1.0;
LARC_TO_SSG[1][3] = 0.0;
LARC_TO_SSG[2][0] = 1.0;
LARC_TO_SSG[2][1] = -0.0;
LARC_TO_SSG[2][2] = 0.0;
LARC_TO_SSG[2][3] = 0.0;
LARC_TO_SSG[3][0] = 0.0;
LARC_TO_SSG[3][1] = 0.0;
LARC_TO_SSG[3][2] = 0.0;
LARC_TO_SSG[3][3] = 1.0;
#endif // USE_FAST_VIEWROT
force_update_fov_math();
}
#define USE_FAST_LOCAL
#ifdef USE_FAST_LOCAL
inline static void fgMakeLOCAL( sgMat4 dst, const double Theta,
const double Phi, const double Psi)
{
SGfloat cosTheta = (SGfloat) cos(Theta);
SGfloat sinTheta = (SGfloat) sin(Theta);
SGfloat cosPhi = (SGfloat) cos(Phi);
SGfloat sinPhi = (SGfloat) sin(Phi);
SGfloat sinPsi = (SGfloat) sin(Psi) ;
SGfloat cosPsi = (SGfloat) cos(Psi) ;
dst[0][0] = cosPhi * cosTheta;
dst[0][1] = sinPhi * cosPsi + cosPhi * -sinTheta * -sinPsi;
dst[0][2] = sinPhi * sinPsi + cosPhi * -sinTheta * cosPsi;
dst[0][3] = SG_ZERO;
dst[1][0] = -sinPhi * cosTheta;
dst[1][1] = cosPhi * cosPsi + -sinPhi * -sinTheta * -sinPsi;
dst[1][2] = cosPhi * sinPsi + -sinPhi * -sinTheta * cosPsi;
dst[1][3] = SG_ZERO ;
dst[2][0] = sinTheta;
dst[2][1] = cosTheta * -sinPsi;
dst[2][2] = cosTheta * cosPsi;
dst[2][3] = SG_ZERO;
dst[3][0] = SG_ZERO;
dst[3][1] = SG_ZERO;
dst[3][2] = SG_ZERO;
dst[3][3] = SG_ONE ;
}
#endif
// Update the view volume, position, and orientation
void FGViewer::UpdateViewParams( const FGInterface& f ) {
UpdateViewMath(f);
if ( ! fgPanelVisible() ) {
xglViewport(0, 0 , (GLint)(winWidth), (GLint)(winHeight) );
} else {
int view_h =
int((current_panel->getViewHeight() - current_panel->getYOffset())
* (winHeight / 768.0));
glViewport(0, (GLint)(winHeight - view_h),
(GLint)(winWidth), (GLint)(view_h) );
}
}
// convert sgMat4 to MAT3 and print
static void print_sgMat4( sgMat4 &in) {
int i, j;
for ( i = 0; i < 4; i++ ) {
for ( j = 0; j < 4; j++ ) {
printf("%10.4f ", in[i][j]);
}
cout << endl;
}
}
// Update the view parameters
void FGViewer::UpdateViewMath( const FGInterface& f ) {
Point3D p;
sgVec3 v0, minus_z, sgvec, forward;
sgMat4 VIEWo, TMP;
if ( update_fov ) {
ssgSetFOV( globals->get_options()->get_fov(),
globals->get_options()->get_fov() * win_ratio );
update_fov = false;
}
scenery.center = scenery.next_center;
// printf("scenery center = %.2f %.2f %.2f\n", scenery.center.x,
// scenery.center.y, scenery.center.z);
// calculate the cartesion coords of the current lat/lon/0 elev
p = Point3D( f.get_Longitude(),
f.get_Lat_geocentric(),
f.get_Sea_level_radius() * FEET_TO_METER );
cur_zero_elev = sgPolarToCart3d(p) - scenery.center;
// calculate view position in current FG view coordinate system
// p.lon & p.lat are already defined earlier, p.radius was set to
// the sea level radius, so now we add in our altitude.
if ( f.get_Altitude() * FEET_TO_METER >
(scenery.cur_elev + 0.5 * METER_TO_FEET) ) {
p.setz( p.radius() + f.get_Altitude() * FEET_TO_METER );
} else {
p.setz( p.radius() + scenery.cur_elev + 0.5 * METER_TO_FEET );
}
abs_view_pos = sgPolarToCart3d(p);
view_pos = abs_view_pos - scenery.center;
FG_LOG( FG_VIEW, FG_DEBUG, "Polar view pos = " << p );
FG_LOG( FG_VIEW, FG_DEBUG, "Absolute view pos = " << abs_view_pos );
FG_LOG( FG_VIEW, FG_DEBUG, "Relative view pos = " << view_pos );
// code to calculate LOCAL matrix calculated from Phi, Theta, and
// Psi (roll, pitch, yaw) in case we aren't running LaRCsim as our
// flight model
#ifdef USE_FAST_LOCAL
fgMakeLOCAL( LOCAL, f.get_Theta(), f.get_Phi(), -f.get_Psi() );
#else // USE_TEXT_BOOK_METHOD
sgVec3 rollvec;
sgSetVec3( rollvec, 0.0, 0.0, 1.0 );
sgMat4 PHI; // roll
sgMakeRotMat4( PHI, f.get_Phi() * RAD_TO_DEG, rollvec );
sgVec3 pitchvec;
sgSetVec3( pitchvec, 0.0, 1.0, 0.0 );
sgMat4 THETA; // pitch
sgMakeRotMat4( THETA, f.get_Theta() * RAD_TO_DEG, pitchvec );
// ROT = PHI * THETA
sgMat4 ROT;
// sgMultMat4( ROT, PHI, THETA );
sgCopyMat4( ROT, PHI );
sgPostMultMat4( ROT, THETA );
sgVec3 yawvec;
sgSetVec3( yawvec, 1.0, 0.0, 0.0 );
sgMat4 PSI; // pitch
sgMakeRotMat4( PSI, -f.get_Psi() * RAD_TO_DEG, yawvec );
// LOCAL = ROT * PSI
// sgMultMat4( LOCAL, ROT, PSI );
sgCopyMat4( LOCAL, ROT );
sgPostMultMat4( LOCAL, PSI );
#endif // YIKES
// cout << "LOCAL matrix" << endl;
// print_sgMat4( LOCAL );
sgMakeRotMat4( UP,
f.get_Longitude() * RAD_TO_DEG,
0.0,
-f.get_Latitude() * RAD_TO_DEG );
sgSetVec3( local_up, UP[0][0], UP[0][1], UP[0][2] );
// sgXformVec3( local_up, UP );
// cout << "Local Up = " << local_up[0] << "," << local_up[1] << ","
// << local_up[2] << endl;
// Alternative method to Derive local up vector based on
// *geodetic* coordinates
// alt_up = sgPolarToCart(FG_Longitude, FG_Latitude, 1.0);
// printf( " Alt Up = (%.4f, %.4f, %.4f)\n",
// alt_up.x, alt_up.y, alt_up.z);
// VIEWo = LOCAL * UP
// sgMultMat4( VIEWo, LOCAL, UP );
sgCopyMat4( VIEWo, LOCAL );
sgPostMultMat4( VIEWo, UP );
// cout << "VIEWo matrix" << endl;
// print_sgMat4( VIEWo );
// generate the sg view up and forward vectors
sgSetVec3( view_up, VIEWo[0][0], VIEWo[0][1], VIEWo[0][2] );
// cout << "view = " << view[0] << ","
// << view[1] << "," << view[2] << endl;
sgSetVec3( forward, VIEWo[2][0], VIEWo[2][1], VIEWo[2][2] );
// cout << "forward = " << forward[0] << ","
// << forward[1] << "," << forward[2] << endl;
// generate the pilot offset vector in world coordinates
sgVec3 pilot_offset_world;
sgSetVec3( pilot_offset_world,
pilot_offset[2], pilot_offset[1], -pilot_offset[0] );
sgXformVec3( pilot_offset_world, pilot_offset_world, VIEWo );
// generate the view offset matrix
sgMakeRotMat4( VIEW_OFFSET, view_offset * RAD_TO_DEG, view_up );
// cout << "VIEW_OFFSET matrix" << endl;
// print_sgMat4( VIEW_OFFSET );
sgXformVec3( view_forward, forward, VIEW_OFFSET );
// cout << "view_forward = " << view_forward[0] << ","
// << view_forward[1] << "," << view_forward[2] << endl;
// VIEW_ROT = LARC_TO_SSG * ( VIEWo * VIEW_OFFSET )
#ifdef USE_FAST_VIEWROT
fgMakeViewRot( VIEW_ROT, VIEW_OFFSET, VIEWo );
#else
// sgMultMat4( VIEW_ROT, VIEW_OFFSET, VIEWo );
// sgPreMultMat4( VIEW_ROT, LARC_TO_SSG );
sgCopyMat4( VIEW_ROT, VIEWo );
sgPostMultMat4( VIEW_ROT, VIEW_OFFSET );
sgPreMultMat4( VIEW_ROT, LARC_TO_SSG );
#endif
// cout << "VIEW_ROT matrix" << endl;
// print_sgMat4( VIEW_ROT );
sgVec3 trans_vec;
sgSetVec3( trans_vec,
view_pos.x() + pilot_offset_world[0],
view_pos.y() + pilot_offset_world[1],
view_pos.z() + pilot_offset_world[2] );
// VIEW = VIEW_ROT * TRANS
sgCopyMat4( VIEW, VIEW_ROT );
sgPostMultMat4ByTransMat4( VIEW, trans_vec );
//!!!!!!!!!!!!!!!!!!!
// THIS IS THE EXPERIMENTAL VIEWING ANGLE SHIFTER
// THE MAJORITY OF THE WORK IS DONE IN GUI.CXX
// this in gui.cxx for now just testing
extern float quat_mat[4][4];
sgPreMultMat4( VIEW, quat_mat);
// !!!!!!!!!! testing
// make a vector to the current view position
sgSetVec3( v0, view_pos.x(), view_pos.y(), view_pos.z() );
// Given a vector pointing straight down (-Z), map into onto the
// local plane representing "horizontal". This should give us the
// local direction for moving "south".
sgSetVec3( minus_z, 0.0, 0.0, -1.0 );
sgmap_vec_onto_cur_surface_plane(local_up, v0, minus_z, surface_south);
sgNormalizeVec3(surface_south);
// cout << "Surface direction directly south " << surface_south[0] << ","
// << surface_south[1] << "," << surface_south[2] << endl;
// now calculate the surface east vector
#define USE_FAST_SURFACE_EAST
#ifdef USE_FAST_SURFACE_EAST
sgVec3 local_down;
sgNegateVec3(local_down, local_up);
sgVectorProductVec3(surface_east, surface_south, local_down);
#else
#define USE_LOCAL_UP
#ifdef USE_LOCAL_UP
sgMakeRotMat4( TMP, FG_PI_2 * RAD_TO_DEG, local_up );
#else
sgMakeRotMat4( TMP, FG_PI_2 * RAD_TO_DEG, view_up );
#endif // USE_LOCAL_UP
// cout << "sgMat4 TMP" << endl;
// print_sgMat4( TMP );
sgXformVec3(surface_east, surface_south, TMP);
#endif // USE_FAST_SURFACE_EAST
// cout << "Surface direction directly east " << surface_east[0] << ","
// << surface_east[1] << "," << surface_east[2] << endl;
// cout << "Should be close to zero = "
// << sgScalarProductVec3(surface_south, surface_east) << endl;
}
void FGViewer::CurrentNormalInLocalPlane(sgVec3 dst, sgVec3 src) {
sgVec3 tmp;
sgSetVec3(tmp, src[0], src[1], src[2] );
sgMat4 TMP;
sgTransposeNegateMat4 ( TMP, UP ) ;
sgXformVec3(tmp, tmp, TMP);
sgSetVec3(dst, tmp[2], tmp[1], tmp[0] );
}
// Destructor
FGViewer::~FGViewer( void ) {
}
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