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flightgear/Main/mesh2GL.c
curt be5527975f Working on making the ground "hard."
1997-07-09 21:31:08 +00:00

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/**************************************************************************
* mesh2GL.c -- walk through a mesh data structure and make GL calls
*
* Written by Curtis Olson, started May 1997.
*
* Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
*
* 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.
*
* $Id$
* (Log is kept at end of this file)
**************************************************************************/
#include <GL/glut.h>
#include "../constants.h"
#include "../Scenery/mesh.h"
#include "../Math/mat3.h"
#include "../Math/polar.h"
/* walk through mesh and make ogl calls */
GLint mesh2GL(struct mesh *m) {
GLint mesh;
/* static GLfloat color[4] = { 0.5, 0.4, 0.25, 1.0 }; */ /* dark desert */
static GLfloat color[4] = { 0.5, 0.5, 0.25, 1.0 };
float x1, y1, x2, y2, z11, z12, z21, z22;
struct fgCartesianPoint p11, p12, p21, p22;
MAT3vec v1, v2, normal;
int i, j, istep, jstep, iend, jend;
float temp;
printf("In mesh2GL(), generating GL call list.\n");
istep = jstep = 4; /* Detail level 1 -- 1200 ... */
/* setup the batch transformation */
fgRotateBatchInit(-m->originx * ARCSEC_TO_RAD, -m->originy * ARCSEC_TO_RAD);
mesh = glGenLists(1);
glNewList(mesh, GL_COMPILE);
glMaterialfv( GL_FRONT, GL_AMBIENT_AND_DIFFUSE, color );
iend = m->cols - 1;
jend = m->rows - 1;
y1 = m->originy;
y2 = y1 + (m->col_step * istep);
for ( i = 0; i < iend; i += istep ) {
x1 = m->originx;
x2 = x1 + (m->row_step * jstep);
glBegin(GL_TRIANGLE_STRIP);
for ( j = 0; j < jend; j += jstep ) {
p11 = fgGeodetic2Cartesian(x1*ARCSEC_TO_RAD, y1*ARCSEC_TO_RAD);
/* printf("A geodetic is (%.2f, %.2f)\n", x1, y1); */
/* printf("A cart is (%.8f, %.8f, %.8f)\n", p11.x, p11.y, p11.z); */
p11 = fgRotateCartesianPoint(p11);
/* printf("A point is (%.8f, %.8f, %.8f)\n", p11.y, p11.z, z11); */
p12 = fgGeodetic2Cartesian(x1*ARCSEC_TO_RAD, y2*ARCSEC_TO_RAD);
p12 = fgRotateCartesianPoint(p12);
p21 = fgGeodetic2Cartesian(x2*ARCSEC_TO_RAD, y1*ARCSEC_TO_RAD);
p21 = fgRotateCartesianPoint(p21);
p22 = fgGeodetic2Cartesian(x2*ARCSEC_TO_RAD, y2*ARCSEC_TO_RAD);
p22 = fgRotateCartesianPoint(p22);
z11 = 0.001 * m->mesh_data[j * m->rows + i ];
z12 = 0.001 * m->mesh_data[j * m->rows + (i+istep)];
z21 = 0.001 * m->mesh_data[(j+jstep) * m->rows + i ];
z22 = 0.001 * m->mesh_data[(j+jstep) * m->rows + (i+istep)];
v1[0] = p22.y - p11.y; v1[1] = p22.z - p11.z; v1[2] = z22 - z11;
v2[0] = p12.y - p11.y; v2[1] = p12.z - p11.z; v2[2] = z12 - z11;
MAT3cross_product(normal, v1, v2);
MAT3_NORMALIZE_VEC(normal,temp);
glNormal3d(normal[0], normal[1], normal[2]);
/* printf("normal 1 = (%.2f %.2f %.2f\n", normal[0], normal[1],
normal[2]); */
if ( j == 0 ) {
/* first time through */
glVertex3d(p11.y, p11.z, z11);
glVertex3d(p12.y, p12.z, z12);
}
glVertex3d(p22.y, p22.z, z22);
v2[0] = p21.y - p11.y; v2[1] = p21.z - p11.z; v2[2] = z21 - z11;
MAT3cross_product(normal, v2, v1);
MAT3_NORMALIZE_VEC(normal,temp);
glNormal3d(normal[0], normal[1], normal[2]);
/* printf("normal 2 = (%.2f %.2f %.2f\n", normal[0], normal[1],
normal[2]); */
glVertex3d(p21.y, p21.z, z21);
x1 = x2;
x2 = x1 + (m->row_step * jstep);
}
glEnd();
y1 = y2;
y2 = y1 + (m->col_step * istep);
}
glEndList();
return(mesh);
}
/* $Log$
/* Revision 1.27 1997/07/09 21:31:13 curt
/* Working on making the ground "hard."
/*
* Revision 1.26 1997/07/08 18:20:13 curt
* Working on establishing a hard ground.
*
* Revision 1.25 1997/07/07 20:59:50 curt
* Working on scenery transformations to enable us to fly fluidly over the
* poles with no discontinuity/distortion in scenery.
*
* Revision 1.24 1997/07/05 20:43:35 curt
* renamed mat3 directory to Math so we could add other math related routines.
*
* Revision 1.23 1997/07/03 00:51:14 curt
* Playing with terrain color.
*
* Revision 1.22 1997/06/29 21:19:17 curt
* Working on scenery management system.
*
* Revision 1.21 1997/06/21 17:12:54 curt
* Capitalized subdirectory names.
*
* Revision 1.20 1997/06/18 04:10:32 curt
* A couple more runway tweaks ...
*
* Revision 1.19 1997/06/18 02:21:24 curt
* Hacked in a runway
*
* Revision 1.18 1997/06/17 04:19:17 curt
* More timer related tweaks with respect to view direction changes.
*
* Revision 1.17 1997/06/16 19:32:52 curt
* Starting to add general timer support.
*
* Revision 1.16 1997/06/02 03:40:07 curt
* A tiny bit more view tweaking.
*
* Revision 1.15 1997/06/02 03:01:38 curt
* Working on views (side, front, back, transitions, etc.)
*
* Revision 1.14 1997/05/31 19:16:26 curt
* Elevator trim added.
*
* Revision 1.13 1997/05/31 04:13:53 curt
* WE CAN NOW FLY!!!
*
* Continuing work on the LaRCsim flight model integration.
* Added some MSFS-like keyboard input handling.
*
* Revision 1.12 1997/05/30 23:26:20 curt
* Added elevator/aileron controls.
*
* Revision 1.11 1997/05/30 19:27:02 curt
* The LaRCsim flight model is starting to look like it is working.
*
* Revision 1.10 1997/05/30 03:54:11 curt
* Made a bit more progress towards integrating the LaRCsim flight model.
*
* Revision 1.9 1997/05/29 22:39:51 curt
* Working on incorporating the LaRCsim flight model.
*
* Revision 1.8 1997/05/29 12:31:40 curt
* Minor tweaks, moving towards general flight model integration.
*
* Revision 1.7 1997/05/29 02:33:24 curt
* Updated to reflect changing interfaces in other "modules."
*
* Revision 1.6 1997/05/27 17:44:32 curt
* Renamed & rearranged variables and routines. Added some initial simple
* timer/alarm routines so the flight model can be updated on a regular
* interval.
*
* Revision 1.5 1997/05/24 01:45:32 curt
* Fixed surface normals for triangle mesh.
*
* Revision 1.4 1997/05/23 20:05:24 curt
* First stab at using GL_TRIANGLE_STRIP's instead of GL_POLYGONS (to conserve
* memory)
*
* Revision 1.3 1997/05/23 15:40:26 curt
* Added GNU copyright headers.
* Fog now works!
*
* Revision 1.2 1997/05/23 00:35:13 curt
* Trying to get fog to work ...
*
* Revision 1.1 1997/05/21 15:57:52 curt
* Renamed due to added GLUT support.
*
* Revision 1.3 1997/05/19 18:22:42 curt
* Parameter tweaking ... starting to stub in fog support.
*
* Revision 1.2 1997/05/17 00:17:35 curt
* Trying to stub in support for standard OpenGL.
*
* Revision 1.1 1997/05/16 16:05:52 curt
* Initial revision.
*
*/
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