365 lines
9.9 KiB
C
365 lines
9.9 KiB
C
/**************************************************************************
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* GLmain.c -- top level sim routines
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*
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* Written by Curtis Olson for OpenGL, started May 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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**************************************************************************/
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#include <math.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <signal.h> /* for timer routines */
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#include <sys/time.h> /* for timer routines */
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#ifdef GLUT
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#include <GL/glut.h>
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#include "GLUTkey.h"
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#elif MESA_TK
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/* assumes -I/usr/include/mesa in compile command */
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#include "gltk.h"
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#include "GLTKkey.h"
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#endif
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#include "../aircraft/aircraft.h"
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#include "../scenery/scenery.h"
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/* This is a record containing all the info for the aircraft currently
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being operated */
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struct aircraft_params current_aircraft;
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/* view parameters */
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static GLfloat win_ratio = 1.0;
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/* temporary hack */
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extern struct mesh *mesh_ptr;
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/* Function prototypes */
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GLint fgSceneryCompile();
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static void fgSceneryDraw();
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/* pointer to terrain mesh structure */
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static GLint mesh;
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/* Another hack */
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double fogDensity = 2000.0;
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/* Another hack */
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#define DEFAULT_MODEL_HZ 120
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double Simtime;
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int Overrun;
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int model_dt;
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/**************************************************************************
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* fgInitVisuals() -- Initialize various GL/view parameters
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**************************************************************************/
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static void fgInitVisuals() {
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/* if the 4th field is 0.0, this specifies a direction ... */
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static GLfloat sun_vec[4] = {3.0, 1.0, 3.0, 0.0 };
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static GLfloat color[4] = { 0.3, 0.7, 0.2, 1.0 };
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static GLfloat fogColor[4] = {0.65, 0.65, 0.85, 1.0};
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glEnable( GL_DEPTH_TEST );
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glFrontFace(GL_CW);
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glEnable( GL_CULL_FACE );
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/* If enabled, normal vectors specified with glNormal are scaled
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to unit length after transformation. See glNormal. */
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glEnable( GL_NORMALIZE );
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glLightfv( GL_LIGHT0, GL_POSITION, sun_vec );
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glEnable( GL_LIGHTING );
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glEnable( GL_LIGHT0 );
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glMaterialfv( GL_FRONT, GL_AMBIENT_AND_DIFFUSE, color );
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glShadeModel( GL_FLAT ); /* glShadeModel( GL_SMOOTH ); */
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glEnable( GL_FOG );
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glFogi (GL_FOG_MODE, GL_LINEAR);
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/* glFogf (GL_FOG_START, 1.0); */
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glFogf (GL_FOG_END, fogDensity);
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glFogfv (GL_FOG_COLOR, fogColor);
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/* glFogf (GL_FOG_DENSITY, fogDensity); */
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/* glHint (GL_FOG_HINT, GL_FASTEST); */
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glClearColor(0.6, 0.6, 0.9, 1.0);
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}
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/**************************************************************************
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* Update the view volume, position, and orientation
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**************************************************************************/
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static void fgUpdateViewParams() {
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struct flight_params *f;
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f = ¤t_aircraft.flight;
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/* Tell GL we are about to modify the projection parameters */
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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gluPerspective(45.0, 1.0/win_ratio, 1.0, 6000.0);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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gluLookAt(f->pos_x, f->pos_y, f->pos_z,
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f->pos_x + cos(f->Psi), f->pos_y + sin(f->Psi), f->pos_z,
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0.0, 0.0, 1.0);
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}
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/**************************************************************************
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* Update all Visuals (redraws anything graphics related)
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**************************************************************************/
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static void fgUpdateVisuals( void ) {
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/* update view volume parameters */
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fgUpdateViewParams();
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glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
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/* Tell GL we are switching to model view parameters */
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glMatrixMode(GL_MODELVIEW);
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/* glLoadIdentity(); */
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/* draw terrain mesh */
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fgSceneryDraw();
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#ifdef GLUT
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glutSwapBuffers();
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#elif MESA_TK
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tkSwapBuffers();
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#endif
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}
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/**************************************************************************
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* Timer management routines
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**************************************************************************/
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static struct itimerval t, ot;
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/* This routine catches the SIGALRM */
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void fgTimerCatch() {
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static double lastSimtime = -99.9;
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/* printf("In fgTimerCatch()\n"); */
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Overrun = (lastSimtime == Simtime);
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/* if ( Overrun ) {
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printf("OVERRUN!!!\n");
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} */
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lastSimtime = Simtime;
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signal(SIGALRM, fgTimerCatch);
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}
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/* this routine initializes the interval timer to generate a SIGALRM after
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* the specified interval (dt) */
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void fgTimerInit(float dt) {
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int terr;
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int isec;
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float usec;
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isec = (int) dt;
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usec = 1000000* (dt - (float) isec);
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t.it_interval.tv_sec = isec;
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t.it_interval.tv_usec = usec;
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t.it_value.tv_sec = isec;
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t.it_value.tv_usec = usec;
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/* printf("fgTimerInit() called\n"); */
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fgTimerCatch(); /* set up for SIGALRM signal catch */
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terr = setitimer( ITIMER_REAL, &t, &ot );
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if (terr) perror("Error returned from setitimer");
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}
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/**************************************************************************
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* Scenery management routines
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**************************************************************************/
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static void fgSceneryInit() {
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/* make terrain mesh */
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mesh = fgSceneryCompile();
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}
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/* create the terrain mesh */
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GLint fgSceneryCompile() {
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GLint mesh;
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mesh = mesh2GL(mesh_ptr);
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return(mesh);
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}
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/* draw the terrain mesh */
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static void fgSceneryDraw() {
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glCallList(mesh);
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}
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/* What should we do when we have nothing else to do? How about get
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* ready for the next move?*/
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static void fgMainLoop( void )
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{
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slew_update();
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aircraft_debug(1);
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fgUpdateVisuals();
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}
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/**************************************************************************
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* Handle new window size or exposure
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**************************************************************************/
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static void fgReshape( int width, int height ) {
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/* Do this so we can call fgReshape(0,0) ourselves without having to know
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* what the values of width & height are. */
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if ( (height > 0) && (width > 0) ) {
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win_ratio = (GLfloat) height / (GLfloat) width;
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}
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/* Inform gl of our view window size */
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glViewport(0, 0, (GLint)width, (GLint)height);
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fgUpdateViewParams();
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glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
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}
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/**************************************************************************
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* Main ...
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**************************************************************************/
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int main( int argc, char *argv[] ) {
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/* parse the scenery file */
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parse_scenery(argv[1]);
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#ifdef GLUT
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/* initialize GLUT */
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glutInit(&argc, argv);
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/* Define Display Parameters */
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glutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE );
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/* Define initial window size */
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glutInitWindowSize(640, 400);
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/* Initialize the main window */
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glutCreateWindow("Terrain Demo");
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#elif MESA_TK
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/* Define initial window size */
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tkInitPosition(0, 0, 640, 400);
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/* Define Display Parameters */
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tkInitDisplayMode( TK_RGB | TK_DEPTH | TK_DOUBLE | TK_DIRECT );
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/* Initialize the main window */
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if (tkInitWindow("Terrain Demo") == GL_FALSE) {
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tkQuit();
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}
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#endif
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/* setup view parameters, only makes GL calls */
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fgInitVisuals();
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/* Set initial position and slew parameters */
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/* slew_init(-398391.3, 120070.4, 244, 3.1415); */ /* GLOBE Airport */
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/* slew_init(-335340,162540, 15, 4.38); */
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slew_init(-398673.28,120625.64, 53, 4.38);
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/* build all objects */
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fgSceneryInit();
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/* initialize timer */
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fgTimerInit( 1.0 / DEFAULT_MODEL_HZ );
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#ifdef GLUT
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/* call fgReshape() on window resizes */
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glutReshapeFunc( fgReshape );
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/* call key() on keyboard event */
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glutKeyboardFunc( GLUTkey );
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glutSpecialFunc( GLUTkey );
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/* call fgMainLoop() whenever there is nothing else to do */
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glutIdleFunc( fgMainLoop );
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/* draw the scene */
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glutDisplayFunc( fgUpdateVisuals );
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/* pass control off to the GLUT event handler */
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glutMainLoop();
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#elif MESA_TK
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/* call fgReshape() on expose events */
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tkExposeFunc( fgReshape );
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/* call fgReshape() on window resizes */
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tkReshapeFunc( fgReshape );
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/* call key() on keyboard event */
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tkKeyDownFunc( GLTKkey );
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/* call fgMainLoop() whenever there is nothing else to do */
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tkIdleFunc( fgMainLoop );
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/* draw the scene */
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tkDisplayFunc( fgUpdateVisuals );
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/* pass control off to the tk event handler */
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tkExec();
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#endif
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return(0);
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}
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/* $Log$
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/* Revision 1.4 1997/05/27 17:44:31 curt
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/* Renamed & rearranged variables and routines. Added some initial simple
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/* timer/alarm routines so the flight model can be updated on a regular interval.
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/*
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* Revision 1.3 1997/05/23 15:40:25 curt
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* Added GNU copyright headers.
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* Fog now works!
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*
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* Revision 1.2 1997/05/23 00:35:12 curt
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* Trying to get fog to work ...
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*
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* Revision 1.1 1997/05/21 15:57:51 curt
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* Renamed due to added GLUT support.
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*
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* Revision 1.3 1997/05/19 18:22:42 curt
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* Parameter tweaking ... starting to stub in fog support.
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*
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* Revision 1.2 1997/05/17 00:17:34 curt
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* Trying to stub in support for standard OpenGL.
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*
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* Revision 1.1 1997/05/16 16:05:52 curt
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* Initial revision.
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*
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*/
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