1 /**************************************************************************
2 * mesh2GL.c -- walk through a mesh data structure and make GL calls
4 * Written by Curtis Olson, started May 1997.
6 * Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
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.
23 * (Log is kept at end of this file)
24 **************************************************************************/
30 /* assumes -I/usr/include/mesa in compile command */
34 #include "../Scenery/mesh.h"
35 #include "../mat3/mat3.h"
38 /* walk through mesh and make ogl calls */
39 GLint mesh2GL(struct mesh *m) {
41 static GLfloat color[4] = { 0.3, 0.7, 0.2, 1.0 };
43 float x1, y1, x2, y2, z11, z12, z21, z22;
45 MAT3vec v1, v2, normal;
46 int i, j, istep, jstep, iend, jend;
49 istep = jstep = 25; /* Detail level 1 -- 1200 ... */
52 glNewList(mesh, GL_COMPILE);
54 glMaterialfv( GL_FRONT, GL_AMBIENT_AND_DIFFUSE, color );
60 y2 = y1 + (m->col_step * istep);
62 for ( i = 0; i < iend; i += istep ) {
64 x2 = x1 + (m->row_step * jstep);
66 glBegin(GL_TRIANGLE_STRIP);
68 for ( j = 0; j < jend; j += jstep ) {
69 z11 = 0.03 * m->mesh_data[j * m->rows + i ];
70 z12 = 0.03 * m->mesh_data[j * m->rows + (i+istep)];
71 z21 = 0.03 * m->mesh_data[(j+jstep) * m->rows + i ];
72 z22 = 0.03 * m->mesh_data[(j+jstep) * m->rows + (i+istep)];
74 v1[0] = x2 - x1; v1[1] = 0; v1[2] = z21 - z11;
75 v2[0] = 0; v2[1] = y2 - y1; v2[2] = z12 - z11;
76 MAT3cross_product(normal, v1, v2);
77 MAT3_NORMALIZE_VEC(normal,temp);
78 glNormal3d(normal[0], normal[1], normal[2]);
81 /* first time through */
82 glVertex3f(x1, y1, z11);
83 glVertex3f(x1, y2, z12);
86 glVertex3f(x2, y1, z21);
88 v1[0] = x2 - x1; v1[1] = y1 - y2; v1[2] = z21 - z12;
89 v2[0] = x2 - x1; v2[1] = 0; v2[2] = z22 - z12;
90 MAT3cross_product(normal, v1, v2);
91 MAT3_NORMALIZE_VEC(normal,temp);
92 glNormal3d(normal[0], normal[1], normal[2]);
93 glVertex3f(x2, y2, z22);
96 x2 = x1 + (m->row_step * jstep);
101 y2 = y1 + (m->col_step * istep);
111 /* Revision 1.21 1997/06/21 17:12:54 curt
112 /* Capitalized subdirectory names.
114 * Revision 1.20 1997/06/18 04:10:32 curt
115 * A couple more runway tweaks ...
117 * Revision 1.19 1997/06/18 02:21:24 curt
120 * Revision 1.18 1997/06/17 04:19:17 curt
121 * More timer related tweaks with respect to view direction changes.
123 * Revision 1.17 1997/06/16 19:32:52 curt
124 * Starting to add general timer support.
126 * Revision 1.16 1997/06/02 03:40:07 curt
127 * A tiny bit more view tweaking.
129 * Revision 1.15 1997/06/02 03:01:38 curt
130 * Working on views (side, front, back, transitions, etc.)
132 * Revision 1.14 1997/05/31 19:16:26 curt
133 * Elevator trim added.
135 * Revision 1.13 1997/05/31 04:13:53 curt
138 * Continuing work on the LaRCsim flight model integration.
139 * Added some MSFS-like keyboard input handling.
141 * Revision 1.12 1997/05/30 23:26:20 curt
142 * Added elevator/aileron controls.
144 * Revision 1.11 1997/05/30 19:27:02 curt
145 * The LaRCsim flight model is starting to look like it is working.
147 * Revision 1.10 1997/05/30 03:54:11 curt
148 * Made a bit more progress towards integrating the LaRCsim flight model.
150 * Revision 1.9 1997/05/29 22:39:51 curt
151 * Working on incorporating the LaRCsim flight model.
153 * Revision 1.8 1997/05/29 12:31:40 curt
154 * Minor tweaks, moving towards general flight model integration.
156 * Revision 1.7 1997/05/29 02:33:24 curt
157 * Updated to reflect changing interfaces in other "modules."
159 * Revision 1.6 1997/05/27 17:44:32 curt
160 * Renamed & rearranged variables and routines. Added some initial simple
161 * timer/alarm routines so the flight model can be updated on a regular
164 * Revision 1.5 1997/05/24 01:45:32 curt
165 * Fixed surface normals for triangle mesh.
167 * Revision 1.4 1997/05/23 20:05:24 curt
168 * First stab at using GL_TRIANGLE_STRIP's instead of GL_POLYGONS (to conserve
171 * Revision 1.3 1997/05/23 15:40:26 curt
172 * Added GNU copyright headers.
175 * Revision 1.2 1997/05/23 00:35:13 curt
176 * Trying to get fog to work ...
178 * Revision 1.1 1997/05/21 15:57:52 curt
179 * Renamed due to added GLUT support.
181 * Revision 1.3 1997/05/19 18:22:42 curt
182 * Parameter tweaking ... starting to stub in fog support.
184 * Revision 1.2 1997/05/17 00:17:35 curt
185 * Trying to stub in support for standard OpenGL.
187 * Revision 1.1 1997/05/16 16:05:52 curt