420 lines
14 KiB
C++
420 lines
14 KiB
C++
// views.cxx -- data structures and routines for managing and view
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// parameters.
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//
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// Written by Curtis Olson, started August 1997.
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//
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// Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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//
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// $Id$
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// (Log is kept at end of this file)
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <Debug/fg_debug.h>
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#include <Flight/flight.h>
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#include <Include/fg_constants.h>
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#include <Math/mat3.h>
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#include <Math/polar3d.h>
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#include <Math/vector.h>
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#include <Scenery/scenery.hxx>
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#include <Time/fg_time.hxx>
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#include "options.hxx"
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#include "views.hxx"
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// This is a record containing current view parameters
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fgVIEW current_view;
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// Constructor
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fgVIEW::fgVIEW( void ) {
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}
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// Initialize a view structure
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void fgVIEW::Init( void ) {
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fgPrintf( FG_VIEW, FG_INFO, "Initializing View parameters\n");
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view_offset = 0.0;
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goal_view_offset = 0.0;
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}
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// Update the view parameters
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void fgVIEW::Update( fgFLIGHT *f ) {
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fgOPTIONS *o;
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fgPolarPoint3d p;
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MAT3vec vec, forward, v0, minus_z;
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MAT3mat R, TMP, UP, LOCAL, VIEW;
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double theta_x, theta_y, ntmp;
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o = ¤t_options;
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scenery.center.x = scenery.next_center.x;
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scenery.center.y = scenery.next_center.y;
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scenery.center.z = scenery.next_center.z;
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// printf("win_ratio = %.2f\n", win_ratio);
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// calculate sin() and cos() of fov / 2 in X direction;
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theta_x = (o->fov * win_ratio * DEG_TO_RAD) / 2.0;
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// printf("theta_x = %.2f\n", theta_x);
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sin_fov_x = sin(theta_x);
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cos_fov_x = cos(theta_x);
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slope_x = sin_fov_x / cos_fov_x;
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// printf("slope_x = %.2f\n", slope_x);
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// calculate sin() and cos() of fov / 2 in Y direction;
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theta_y = (o->fov * DEG_TO_RAD) / 2.0;
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// printf("theta_y = %.2f\n", theta_y);
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sin_fov_y = sin(theta_y);
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cos_fov_y = cos(theta_y);
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slope_y = sin_fov_y / cos_fov_y;
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// printf("slope_y = %.2f\n", slope_y);
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// calculate the cartesion coords of the current lat/lon/0 elev
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p.lon = FG_Longitude;
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p.lat = FG_Lat_geocentric;
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p.radius = FG_Sea_level_radius * FEET_TO_METER;
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cur_zero_elev = fgPolarToCart3d(p);
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cur_zero_elev.x -= scenery.center.x;
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cur_zero_elev.y -= scenery.center.y;
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cur_zero_elev.z -= scenery.center.z;
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// calculate view position in current FG view coordinate system
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// p.lon & p.lat are already defined earlier
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p.radius = FG_Radius_to_vehicle * FEET_TO_METER + 1.0;
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abs_view_pos = fgPolarToCart3d(p);
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view_pos.x = abs_view_pos.x - scenery.center.x;
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view_pos.y = abs_view_pos.y - scenery.center.y;
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view_pos.z = abs_view_pos.z - scenery.center.z;
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fgPrintf( FG_VIEW, FG_DEBUG, "Absolute view pos = %.4f, %.4f, %.4f\n",
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abs_view_pos.x, abs_view_pos.y, abs_view_pos.z);
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fgPrintf( FG_VIEW, FG_DEBUG, "Relative view pos = %.4f, %.4f, %.4f\n",
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view_pos.x, view_pos.y, view_pos.z);
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// Derive the LOCAL aircraft rotation matrix (roll, pitch, yaw)
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// from FG_T_local_to_body[3][3]
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// Question: Why is the LaRCsim matrix arranged so differently
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// than the one we need???
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LOCAL[0][0] = FG_T_local_to_body_33;
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LOCAL[0][1] = -FG_T_local_to_body_32;
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LOCAL[0][2] = -FG_T_local_to_body_31;
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LOCAL[0][3] = 0.0;
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LOCAL[1][0] = -FG_T_local_to_body_23;
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LOCAL[1][1] = FG_T_local_to_body_22;
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LOCAL[1][2] = FG_T_local_to_body_21;
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LOCAL[1][3] = 0.0;
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LOCAL[2][0] = -FG_T_local_to_body_13;
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LOCAL[2][1] = FG_T_local_to_body_12;
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LOCAL[2][2] = FG_T_local_to_body_11;
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LOCAL[2][3] = 0.0;
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LOCAL[3][0] = LOCAL[3][1] = LOCAL[3][2] = LOCAL[3][3] = 0.0;
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LOCAL[3][3] = 1.0;
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// printf("LaRCsim LOCAL matrix\n");
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// MAT3print(LOCAL, stdout);
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#ifdef OLD_LOCAL_TO_BODY_CODE
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// old code to calculate LOCAL matrix calculated from Phi,
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// Theta, and Psi (roll, pitch, yaw)
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MAT3_SET_VEC(vec, 0.0, 0.0, 1.0);
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MAT3rotate(R, vec, FG_Phi);
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/* printf("Roll matrix\n"); */
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/* MAT3print(R, stdout); */
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MAT3_SET_VEC(vec, 0.0, 1.0, 0.0);
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/* MAT3mult_vec(vec, vec, R); */
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MAT3rotate(TMP, vec, FG_Theta);
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/* printf("Pitch matrix\n"); */
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/* MAT3print(TMP, stdout); */
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MAT3mult(R, R, TMP);
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MAT3_SET_VEC(vec, 1.0, 0.0, 0.0);
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/* MAT3mult_vec(vec, vec, R); */
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/* MAT3rotate(TMP, vec, FG_Psi - FG_PI_2); */
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MAT3rotate(TMP, vec, -FG_Psi);
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/* printf("Yaw matrix\n");
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MAT3print(TMP, stdout); */
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MAT3mult(LOCAL, R, TMP);
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// printf("FG derived LOCAL matrix\n");
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// MAT3print(LOCAL, stdout);
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#endif // OLD_LOCAL_TO_BODY_CODE
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// Derive the local UP transformation matrix based on *geodetic*
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// coordinates
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MAT3_SET_VEC(vec, 0.0, 0.0, 1.0);
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MAT3rotate(R, vec, FG_Longitude); // R = rotate about Z axis
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// printf("Longitude matrix\n");
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// MAT3print(R, stdout);
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MAT3_SET_VEC(vec, 0.0, 1.0, 0.0);
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MAT3mult_vec(vec, vec, R);
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MAT3rotate(TMP, vec, -FG_Latitude); // TMP = rotate about X axis
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// printf("Latitude matrix\n");
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// MAT3print(TMP, stdout);
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MAT3mult(UP, R, TMP);
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// printf("Local up matrix\n");
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// MAT3print(UP, stdout);
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MAT3_SET_VEC(local_up, 1.0, 0.0, 0.0);
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MAT3mult_vec(local_up, local_up, UP);
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// printf( "Local Up = (%.4f, %.4f, %.4f)\n",
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// local_up[0], local_up[1], local_up[2]);
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// Alternative method to Derive local up vector based on
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// *geodetic* coordinates
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// alt_up = fgPolarToCart(FG_Longitude, FG_Latitude, 1.0);
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// printf( " Alt Up = (%.4f, %.4f, %.4f)\n",
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// alt_up.x, alt_up.y, alt_up.z);
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// Calculate the VIEW matrix
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MAT3mult(VIEW, LOCAL, UP);
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// printf("VIEW matrix\n");
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// MAT3print(VIEW, stdout);
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// generate the current up, forward, and fwrd-view vectors
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MAT3_SET_VEC(vec, 1.0, 0.0, 0.0);
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MAT3mult_vec(view_up, vec, VIEW);
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MAT3_SET_VEC(vec, 0.0, 0.0, 1.0);
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MAT3mult_vec(forward, vec, VIEW);
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// printf( "Forward vector is (%.2f,%.2f,%.2f)\n", forward[0], forward[1],
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// forward[2]);
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MAT3rotate(TMP, view_up, view_offset);
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MAT3mult_vec(view_forward, forward, TMP);
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// make a vector to the current view position
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MAT3_SET_VEC(v0, view_pos.x, view_pos.y, view_pos.z);
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// Given a vector pointing straight down (-Z), map into onto the
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// local plane representing "horizontal". This should give us the
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// local direction for moving "south".
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MAT3_SET_VEC(minus_z, 0.0, 0.0, -1.0);
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map_vec_onto_cur_surface_plane(local_up, v0, minus_z, surface_south);
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MAT3_NORMALIZE_VEC(surface_south, ntmp);
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// printf( "Surface direction directly south %.2f %.2f %.2f\n",
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// surface_south[0], surface_south[1], surface_south[2]);
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// now calculate the surface east vector
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MAT3rotate(TMP, view_up, FG_PI_2);
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MAT3mult_vec(surface_east, surface_south, TMP);
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// printf( "Surface direction directly east %.2f %.2f %.2f\n",
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// surface_east[0], surface_east[1], surface_east[2]);
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// printf( "Should be close to zero = %.2f\n",
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// MAT3_DOT_PRODUCT(surface_south, surface_east));
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}
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// Update the "World to Eye" transformation matrix
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// This is most useful for view frustum culling
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void fgVIEW::UpdateWorldToEye( fgFLIGHT *f ) {
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MAT3mat R_Phi, R_Theta, R_Psi, R_Lat, R_Lon, T_view;
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MAT3mat TMP;
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MAT3hvec vec;
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// Roll Matrix
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MAT3_SET_HVEC(vec, 0.0, 0.0, -1.0, 1.0);
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MAT3rotate(R_Phi, vec, FG_Phi);
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// printf("Roll matrix (Phi)\n");
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// MAT3print(R_Phi, stdout);
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// Pitch Matrix
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MAT3_SET_HVEC(vec, 1.0, 0.0, 0.0, 1.0);
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MAT3rotate(R_Theta, vec, FG_Theta);
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// printf("\nPitch matrix (Theta)\n");
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// MAT3print(R_Theta, stdout);
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// Yaw Matrix
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MAT3_SET_HVEC(vec, 0.0, -1.0, 0.0, 1.0);
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MAT3rotate(R_Psi, vec, FG_Psi + FG_PI - view_offset );
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// printf("\nYaw matrix (Psi)\n");
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// MAT3print(R_Psi, stdout);
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// Latitude
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MAT3_SET_HVEC(vec, 1.0, 0.0, 0.0, 1.0);
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// R_Lat = rotate about X axis
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MAT3rotate(R_Lat, vec, FG_Latitude);
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// printf("\nLatitude matrix\n");
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// MAT3print(R_Lat, stdout);
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// Longitude
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MAT3_SET_HVEC(vec, 0.0, 0.0, 1.0, 1.0);
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// R_Lon = rotate about Z axis
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MAT3rotate(R_Lon, vec, FG_Longitude - FG_PI_2 );
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// printf("\nLongitude matrix\n");
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// MAT3print(R_Lon, stdout);
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// View position in scenery centered coordinates
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MAT3_SET_HVEC(vec, view_pos.x, view_pos.y, view_pos.z, 1.0);
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MAT3translate(T_view, vec);
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// printf("\nTranslation matrix\n");
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// MAT3print(T_view, stdout);
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// aircraft roll/pitch/yaw
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MAT3mult(TMP, R_Phi, R_Theta);
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MAT3mult(AIRCRAFT, TMP, R_Psi);
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// printf("\naircraft roll pitch yaw\n");
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// MAT3print(AIRCRAFT, stdout);
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// lon/lat
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MAT3mult(WORLD, R_Lat, R_Lon);
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// printf("\nworld\n");
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// MAT3print(WORLD, stdout);
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MAT3mult(EYE_TO_WORLD, AIRCRAFT, WORLD);
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MAT3mult(EYE_TO_WORLD, EYE_TO_WORLD, T_view);
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// printf("\nEye to world\n");
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// MAT3print(EYE_TO_WORLD, stdout);
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MAT3invert(WORLD_TO_EYE, EYE_TO_WORLD);
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// printf("\nWorld to eye\n");
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// MAT3print(WORLD_TO_EYE, stdout);
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// printf( "\nview_pos = %.2f %.2f %.2f\n",
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// view_pos.x, view_pos.y, view_pos.z );
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// MAT3_SET_HVEC(eye, 0.0, 0.0, 0.0, 1.0);
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// MAT3mult_vec(vec, eye, EYE_TO_WORLD);
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// printf("\neye -> world = %.2f %.2f %.2f\n", vec[0], vec[1], vec[2]);
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// MAT3_SET_HVEC(vec1, view_pos.x, view_pos.y, view_pos.z, 1.0);
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// MAT3mult_vec(vec, vec1, WORLD_TO_EYE);
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// printf( "\nabs_view_pos -> eye = %.2f %.2f %.2f\n",
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// vec[0], vec[1], vec[2]);
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}
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// Destructor
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fgVIEW::~fgVIEW( void ) {
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}
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// $Log$
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// Revision 1.10 1998/05/17 16:59:03 curt
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// First pass at view frustum culling now operational.
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//
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// Revision 1.9 1998/05/16 13:08:37 curt
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// C++ - ified views.[ch]xx
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// Shuffled some additional view parameters into the fgVIEW class.
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// Changed tile-radius to tile-diameter because it is a much better
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// name.
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// Added a WORLD_TO_EYE transformation to views.cxx. This allows us
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// to transform world space to eye space for view frustum culling.
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//
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// Revision 1.8 1998/05/02 01:51:01 curt
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// Updated polartocart conversion routine.
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//
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// Revision 1.7 1998/04/30 12:34:20 curt
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// Added command line rendering options:
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// enable/disable fog/haze
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// specify smooth/flat shading
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// disable sky blending and just use a solid color
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// enable wireframe drawing mode
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//
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// Revision 1.6 1998/04/28 01:20:23 curt
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// Type-ified fgTIME and fgVIEW.
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// Added a command line option to disable textures.
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//
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// Revision 1.5 1998/04/26 05:10:04 curt
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// "struct fgLIGHT" -> "fgLIGHT" because fgLIGHT is typedef'd.
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//
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// Revision 1.4 1998/04/25 22:04:53 curt
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// Use already calculated LaRCsim values to create the roll/pitch/yaw
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// transformation matrix (we call it LOCAL)
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//
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// Revision 1.3 1998/04/25 20:24:02 curt
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// Cleaned up initialization sequence to eliminate interdependencies
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// between sun position, lighting, and view position. This creates a
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// valid single pass initialization path.
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//
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// Revision 1.2 1998/04/24 00:49:22 curt
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// Wrapped "#include <config.h>" in "#ifdef HAVE_CONFIG_H"
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// Trying out some different option parsing code.
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// Some code reorganization.
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//
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// Revision 1.1 1998/04/22 13:25:45 curt
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// C++ - ifing the code.
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// Starting a bit of reorganization of lighting code.
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//
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// Revision 1.16 1998/04/18 04:11:29 curt
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// Moved fg_debug to it's own library, added zlib support.
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//
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// Revision 1.15 1998/02/20 00:16:24 curt
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// Thursday's tweaks.
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//
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// Revision 1.14 1998/02/09 15:07:50 curt
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// Minor tweaks.
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//
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// Revision 1.13 1998/02/07 15:29:45 curt
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// Incorporated HUD changes and struct/typedef changes from Charlie Hotchkiss
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// <chotchkiss@namg.us.anritsu.com>
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//
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// Revision 1.12 1998/01/29 00:50:28 curt
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// Added a view record field for absolute x, y, z position.
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//
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// Revision 1.11 1998/01/27 00:47:58 curt
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// Incorporated Paul Bleisch's <pbleisch@acm.org> new debug message
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// system and commandline/config file processing code.
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//
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// Revision 1.10 1998/01/19 19:27:09 curt
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// Merged in make system changes from Bob Kuehne <rpk@sgi.com>
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// This should simplify things tremendously.
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//
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// Revision 1.9 1998/01/13 00:23:09 curt
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// Initial changes to support loading and management of scenery tiles. Note,
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// there's still a fair amount of work left to be done.
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//
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// Revision 1.8 1997/12/30 22:22:33 curt
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// Further integration of event manager.
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//
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// Revision 1.7 1997/12/30 20:47:45 curt
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// Integrated new event manager with subsystem initializations.
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//
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// Revision 1.6 1997/12/22 04:14:32 curt
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// Aligned sky with sun so dusk/dawn effects can be correct relative to the sun.
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//
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// Revision 1.5 1997/12/18 04:07:02 curt
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// Worked on properly translating and positioning the sky dome.
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//
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// Revision 1.4 1997/12/17 23:13:36 curt
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// Began working on rendering a sky.
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//
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// Revision 1.3 1997/12/15 23:54:50 curt
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// Add xgl wrappers for debugging.
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// Generate terrain normals on the fly.
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//
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// Revision 1.2 1997/12/10 22:37:48 curt
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// Prepended "fg" on the name of all global structures that didn't have it yet.
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// i.e. "struct WEATHER {}" became "struct fgWEATHER {}"
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//
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// Revision 1.1 1997/08/27 21:31:17 curt
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// Initial revision.
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//
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