-/**************************************************************************
+/* -*- Mode: C++ -*-
+ *
* obj.c -- routines to handle WaveFront .obj format files.
*
* Written by Curtis Olson, started October 1997.
**************************************************************************/
-#ifdef WIN32
+#include <config.h>
+
+#ifdef HAVE_WINDOWS_H
# include <windows.h>
#endif
#include <stdio.h>
#include <string.h>
#include <GL/glut.h>
+#include <XGL/xgl.h>
-#include "obj.h"
-#include "scenery.h"
+#include <Debug/fg_debug.h>
+#include <Include/fg_constants.h>
+#include <Math/mat3.h>
+#include <Math/fg_random.h>
+#include <Scenery/obj.h>
+#include <Scenery/scenery.h>
+#include <zlib/zlib.h>
-#include "../Math/mat3.h"
+#define MAXNODES 100000
+static double nodes[MAXNODES][3];
+static double normals[MAXNODES][3];
-#define MAXNODES 100000
-float nodes[MAXNODES][3];
-float normals[MAXNODES][3];
+/* given three points defining a triangle, calculate the normal */
+void calc_normal(double p1[3], double p2[3], double p3[3], double normal[3])
+{
+ double v1[3], v2[3];
+ double temp;
+
+ v1[0] = p2[0] - p1[0]; v1[1] = p2[1] - p1[1]; v1[2] = p2[2] - p1[2];
+ v2[0] = p3[0] - p1[0]; v2[1] = p3[1] - p1[1]; v2[2] = p3[2] - p1[2];
+
+ MAT3cross_product(normal, v1, v2);
+ MAT3_NORMALIZE_VEC(normal,temp);
+
+ /* fgPrintf( FG_TERRAIN, FG_DEBUG, " Normal = %.2f %.2f %.2f\n",
+ normal[0], normal[1], normal[2]);*/
+}
+
+
+#define FG_TEX_CONSTANT 128.0
+
+float calc_lon(double x, double y, double z) {
+ float tmp;
+ tmp = (RAD_TO_DEG*atan2(y, x)) * FG_TEX_CONSTANT;
+
+ // printf("lon = %.2f\n", (float)tmp);
+ return (float)tmp;
+}
+
+
+float calc_lat(double x, double y, double z) {
+ float tmp;
+
+ tmp = (90.0 - RAD_TO_DEG*atan2( sqrt(x*x + y*y), z )) * FG_TEX_CONSTANT;
+
+ // printf("lat = %.2f\n", (float)tmp);
+ return (float)tmp;
+}
/* Load a .obj file and generate the GL call list */
-GLint fgObjLoad(char *path) {
- char line[256], winding[256];
- static GLfloat color[4] = { 0.5, 0.5, 0.25, 1.0 };
- double v1[3], v2[3], approx_normal[3], dot_prod, temp;
- struct fgCartesianPoint ref;
- GLint area;
- FILE *f;
+GLint fgObjLoad(char *path, struct fgCartesianPoint *ref, double *radius) {
+ char gzpath[256], line[256], winding_str[256];
+ double approx_normal[3], normal[3], scale;
+ double x, y, z, xmax, xmin, ymax, ymin, zmax, zmin;
+ GLfloat sgenparams[] = { 1.0, 0.0, 0.0, 0.0 };
+ GLint tile;
+ gzFile f;
int first, ncount, vncount, n1, n2, n3, n4;
- int i;
-
- if ( (f = fopen(path, "r")) == NULL ) {
- printf("Cannot open file: %s\n", path);
- exit(-1);
+ static int use_per_vertex_norms = 1;
+ int winding;
+ int last1, last2, odd;
+
+ // First try "path.gz"
+ strcpy(gzpath, path);
+ strcat(gzpath, ".gz");
+ if ( (f = gzopen(gzpath, "r")) == NULL ) {
+ // Next try "path"
+ if ( (f = gzopen(path, "r")) == NULL ) {
+ fgPrintf(FG_TERRAIN, FG_ALERT, "Cannot open file: %s\n", path);
+ return(-1);
+ }
}
- area = glGenLists(1);
- glNewList(area, GL_COMPILE);
+ tile = xglGenLists(1);
+ xglNewList(tile, GL_COMPILE);
- /* glMaterialfv( GL_FRONT, GL_AMBIENT_AND_DIFFUSE, color ); */
- glColor3fv(color);
+ /*
+ xglTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR);
+ xglTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR);
+ xglTexGenfv(GL_S, GL_OBJECT_PLANE, sgenparams);
+ xglTexGenfv(GL_T, GL_OBJECT_PLANE, sgenparams);
+ // xglTexGenfv(GL_S, GL_SPHERE_MAP, 0);
+ // xglTexGenfv(GL_T, GL_SPHERE_MAP, 0);
+ xglEnable(GL_TEXTURE_GEN_S);
+ xglEnable(GL_TEXTURE_GEN_T);
+ */
first = 1;
ncount = 1;
vncount = 1;
- while ( fgets(line, 250, f) != NULL ) {
+ while ( gzgets(f, line, 250) != NULL ) {
if ( line[0] == '#' ) {
/* comment -- ignore */
+ } else if ( line[0] == '\n' ) {
+ /* empty line -- ignore */
} else if ( strncmp(line, "v ", 2) == 0 ) {
/* node (vertex) */
if ( ncount < MAXNODES ) {
- /* printf("vertex = %s", line); */
- sscanf(line, "v %f %f %f\n",
- &nodes[ncount][0], &nodes[ncount][1], &nodes[ncount][2]);
+ /* fgPrintf( FG_TERRAIN, FG_DEBUG, "vertex = %s", line); */
+ sscanf(line, "v %lf %lf %lf\n", &x, &y, &z);
+ nodes[ncount][0] = x;
+ nodes[ncount][1] = y;
+ nodes[ncount][2] = z;
+
+ /* first time through set min's and max'es */
if ( ncount == 1 ) {
- /* first node becomes the reference point */
- ref.x = nodes[ncount][0];
- ref.y = nodes[ncount][1];
- ref.z = nodes[ncount][2];
- scenery.center = ref;
+ xmin = x;
+ xmax = x;
+ ymin = y;
+ ymax = y;
+ zmin = z;
+ zmax = z;
}
+
+ /* keep track of min/max vertex values */
+ if ( x < xmin ) xmin = x;
+ if ( x > xmax ) xmax = x;
+ if ( y < ymin ) ymin = y;
+ if ( y > ymax ) ymax = y;
+ if ( z < zmin ) zmin = z;
+ if ( z > zmax ) zmax = z;
+
ncount++;
} else {
- printf("Read too many nodes ... dying :-(\n");
- exit(-1);
+ fgPrintf( FG_TERRAIN, FG_EXIT,
+ "Read too many nodes ... dying :-(\n");
}
} else if ( strncmp(line, "vn ", 3) == 0 ) {
/* vertex normal */
if ( vncount < MAXNODES ) {
- /* printf("vertex normal = %s", line); */
- sscanf(line, "vn %f %f %f\n",
+ /* fgPrintf( FG_TERRAIN, FG_DEBUG, "vertex normal = %s", line); */
+ sscanf(line, "vn %lf %lf %lf\n",
&normals[vncount][0], &normals[vncount][1],
&normals[vncount][2]);
vncount++;
} else {
- printf("Read too many vertex normals ... dying :-(\n");
- exit(-1);
+ fgPrintf( FG_TERRAIN, FG_EXIT,
+ "Read too many vertex normals ... dying :-(\n");
}
} else if ( strncmp(line, "winding ", 8) == 0 ) {
- sscanf(line+8, "%s", winding);
- printf("WINDING = %s\n", winding);
+ sscanf(line+8, "%s", winding_str);
+ fgPrintf( FG_TERRAIN, FG_DEBUG, " WINDING = %s\n", winding_str);
- /* can't call glFrontFace() between glBegin() & glEnd() */
- glEnd();
+ /* can't call xglFrontFace() between xglBegin() & xglEnd() */
+ xglEnd();
first = 1;
- if ( strcmp(winding, "cw") == 0 ) {
- glFrontFace( GL_CW );
+ if ( strcmp(winding_str, "cw") == 0 ) {
+ xglFrontFace( GL_CW );
+ winding = 0;
} else {
glFrontFace ( GL_CCW );
+ winding = 1;
}
} else if ( line[0] == 't' ) {
/* start a new triangle strip */
if ( !first ) {
/* close out the previous structure and start the next */
- glEnd();
+ xglEnd();
} else {
first = 0;
}
- /* printf("new tri strip = %s", line); */
+ /* fgPrintf( FG_TERRAIN, FG_DEBUG, " new tri strip = %s",
+ line); */
sscanf(line, "t %d %d %d %d\n", &n1, &n2, &n3, &n4);
- /* printf("(t) = "); */
-
- /* try to get the proper rotation by calculating an
- * approximate normal and seeing if it is close to the
- * precalculated normal */
- /*v1[0] = nodes[n2][0] - nodes[n1][0];
- v1[1] = nodes[n2][1] - nodes[n1][1];
- v1[2] = nodes[n2][2] - nodes[n1][2];
- v2[0] = nodes[n3][0] - nodes[n1][0];
- v2[1] = nodes[n3][1] - nodes[n1][1];
- v2[2] = nodes[n3][2] - nodes[n1][2];
- MAT3cross_product(approx_normal, v1, v2);
- MAT3_NORMALIZE_VEC(approx_normal,temp);
- printf("Approx normal = %.2f %.2f %.2f\n", approx_normal[0],
- approx_normal[1], approx_normal[2]);
- dot_prod = MAT3_DOT_PRODUCT(normals[n1], approx_normal);
- printf("Dot product = %.4f\n", dot_prod); */
- /* angle = acos(dot_prod); */
- /* printf("Normal ANGLE = %.3f rads.\n", angle); */
-
- /* if ( dot_prod < -0.5 ) {
- glFrontFace( GL_CW );
- } else {
- glFrontFace( GL_CCW );
- } */
+ /* fgPrintf( FG_TERRAIN, FG_DEBUG, "(t) = "); */
- glBegin(GL_TRIANGLE_STRIP);
+ xglBegin(GL_TRIANGLE_STRIP);
- glNormal3d(normals[n1][0], normals[n1][1], normals[n1][2]);
- glVertex3d(nodes[n1][0] - ref.x, nodes[n1][1] - ref.y,
- nodes[n1][2] - ref.z);
+ if ( winding ) {
+ odd = 1;
+ scale = 1.0;
+ } else {
+ odd = 0;
+ scale = 1.0;
+ }
- glNormal3d(normals[n2][0], normals[n2][1], normals[n2][2]);
- glVertex3d(nodes[n2][0] - ref.x, nodes[n2][1] - ref.y,
- nodes[n2][2] - ref.z);
+ if ( use_per_vertex_norms ) {
+ MAT3_SCALE_VEC(normal, normals[n1], scale);
+ xglNormal3dv(normal);
+ xglTexCoord2f(calc_lon(nodes[n1][0], nodes[n1][1], nodes[n1][2]), calc_lat(nodes[n1][0], nodes[n1][1], nodes[n1][2]));
+ xglVertex3d(nodes[n1][0], nodes[n1][1], nodes[n1][2]);
+
+ MAT3_SCALE_VEC(normal, normals[n2], scale);
+ xglNormal3dv(normal);
+ xglTexCoord2f(calc_lon(nodes[n2][0], nodes[n2][1], nodes[n2][2]), calc_lat(nodes[n2][0], nodes[n2][1], nodes[n2][2]));
+ xglVertex3d(nodes[n2][0], nodes[n2][1], nodes[n2][2]);
+
+ MAT3_SCALE_VEC(normal, normals[n3], scale);
+ xglNormal3dv(normal);
+ xglTexCoord2f(calc_lon(nodes[n3][0], nodes[n3][1], nodes[n3][2]), calc_lat(nodes[n3][0], nodes[n3][1], nodes[n3][2]));
+ xglVertex3d(nodes[n3][0], nodes[n3][1], nodes[n3][2]);
+ } else {
+ if ( odd ) {
+ calc_normal(nodes[n1], nodes[n2], nodes[n3], approx_normal);
+ } else {
+ calc_normal(nodes[n2], nodes[n1], nodes[n3], approx_normal);
+ }
+ MAT3_SCALE_VEC(normal, approx_normal, scale);
+ xglNormal3dv(normal);
+
+ xglTexCoord2f(calc_lon(nodes[n1][0], nodes[n1][1], nodes[n1][2]), calc_lat(nodes[n1][0], nodes[n1][1], nodes[n1][2]));
+ xglVertex3d(nodes[n1][0], nodes[n1][1], nodes[n1][2]);
+ xglTexCoord2f(calc_lon(nodes[n2][0], nodes[n2][1], nodes[n2][2]), calc_lat(nodes[n2][0], nodes[n2][1], nodes[n2][2]));
+ xglVertex3d(nodes[n2][0], nodes[n2][1], nodes[n2][2]);
+ xglTexCoord2f(calc_lon(nodes[n3][0], nodes[n3][1], nodes[n3][2]), calc_lat(nodes[n3][0], nodes[n3][1], nodes[n3][2]));
+ xglVertex3d(nodes[n3][0], nodes[n3][1], nodes[n3][2]);
+ }
- glNormal3d(normals[n3][0], normals[n3][1], normals[n3][2]);
- glVertex3d(nodes[n3][0] - ref.x, nodes[n3][1] - ref.y,
- nodes[n3][2] - ref.z);
+ odd = 1 - odd;
+ last1 = n2;
+ last2 = n3;
if ( n4 > 0 ) {
- glNormal3d(normals[n4][0], normals[n4][1], normals[n4][2]);
- glVertex3d(nodes[n4][0] - ref.x, nodes[n4][1] - ref.y,
- nodes[n4][2] - ref.z);
+ if ( use_per_vertex_norms ) {
+ MAT3_SCALE_VEC(normal, normals[n4], scale);
+ } else {
+ calc_normal(nodes[n3], nodes[n2], nodes[n4], approx_normal);
+ MAT3_SCALE_VEC(normal, approx_normal, scale);
+ }
+ xglNormal3dv(normal);
+ xglTexCoord2f(calc_lon(nodes[n4][0], nodes[n4][1], nodes[n4][2]), calc_lat(nodes[n4][0], nodes[n4][1], nodes[n4][2]));
+ xglVertex3d(nodes[n4][0], nodes[n4][1], nodes[n4][2]);
+
+ odd = 1 - odd;
+ last1 = n3;
+ last2 = n4;
}
} else if ( line[0] == 'f' ) {
/* unoptimized face */
if ( !first ) {
/* close out the previous structure and start the next */
- glEnd();
+ xglEnd();
} else {
first = 0;
}
- glBegin(GL_TRIANGLES);
+ xglBegin(GL_TRIANGLES);
- /* printf("new triangle = %s", line);*/
+ /* fgPrintf( FG_TERRAIN, FG_DEBUG, "new triangle = %s", line);*/
sscanf(line, "f %d %d %d\n", &n1, &n2, &n3);
- glNormal3d(normals[n1][0], normals[n1][1], normals[n1][2]);
- glVertex3d(nodes[n1][0] - ref.x, nodes[n1][1] - ref.y,
- nodes[n1][2] - ref.z);
-
- glNormal3d(normals[n2][0], normals[n2][1], normals[n2][2]);
- glVertex3d(nodes[n2][0] - ref.x, nodes[n2][1] - ref.y,
- nodes[n2][2] - ref.z);
-
- glNormal3d(normals[n3][0], normals[n3][1], normals[n3][2]);
- glVertex3d(nodes[n3][0] - ref.x, nodes[n3][1] - ref.y,
- nodes[n3][2] - ref.z);
+ xglNormal3d(normals[n1][0], normals[n1][1], normals[n1][2]);
+ xglTexCoord2f(calc_lon(nodes[n1][0], nodes[n1][1], nodes[n1][2]), calc_lat(nodes[n1][0], nodes[n1][1], nodes[n1][2]));
+ xglVertex3d(nodes[n1][0], nodes[n1][1], nodes[n1][2]);
+
+ xglNormal3d(normals[n2][0], normals[n2][1], normals[n2][2]);
+ xglTexCoord2f(calc_lon(nodes[n2][0], nodes[n2][1], nodes[n2][2]), calc_lat(nodes[n2][0], nodes[n2][1], nodes[n2][2]));
+ xglVertex3d(nodes[n2][0], nodes[n2][1], nodes[n2][2]);
+
+ xglNormal3d(normals[n3][0], normals[n3][1], normals[n3][2]);
+ xglTexCoord2f(calc_lon(nodes[n3][0], nodes[n3][1], nodes[n3][2]), calc_lat(nodes[n3][0], nodes[n3][1], nodes[n3][2]));
+ xglVertex3d(nodes[n3][0], nodes[n3][1], nodes[n3][2]);
} else if ( line[0] == 'q' ) {
/* continue a triangle strip */
n1 = n2 = 0;
- /* printf("continued tri strip = %s ", line); */
+ /* fgPrintf( FG_TERRAIN, FG_DEBUG, "continued tri strip = %s ",
+ line); */
sscanf(line, "q %d %d\n", &n1, &n2);
- /* printf("read %d %d\n", n1, n2); */
+ /* fgPrintf( FG_TERRAIN, FG_DEBUG, "read %d %d\n", n1, n2); */
+
+ if ( use_per_vertex_norms ) {
+ MAT3_SCALE_VEC(normal, normals[n1], scale);
+ xglNormal3dv(normal);
+ } else {
+ if ( odd ) {
+ calc_normal(nodes[last1], nodes[last2], nodes[n1],
+ approx_normal);
+ } else {
+ calc_normal(nodes[last2], nodes[last1], nodes[n1],
+ approx_normal);
+ }
+ MAT3_SCALE_VEC(normal, approx_normal, scale);
+ xglNormal3dv(normal);
+ }
- glNormal3d(normals[n1][0], normals[n1][1], normals[n1][2]);
- glVertex3d(nodes[n1][0] - ref.x, nodes[n1][1] - ref.y,
- nodes[n1][2] - ref.z);
+ xglTexCoord2f(calc_lon(nodes[n1][0], nodes[n1][1], nodes[n1][2]), calc_lat(nodes[n1][0], nodes[n1][1], nodes[n1][2]));
+ xglVertex3d(nodes[n1][0], nodes[n1][1], nodes[n1][2]);
+
+ odd = 1 - odd;
+ last1 = last2;
+ last2 = n1;
if ( n2 > 0 ) {
- /* printf(" (cont)\n"); */
- glNormal3d(normals[n2][0], normals[n2][1], normals[n2][2]);
- glVertex3d(nodes[n2][0] - ref.x, nodes[n2][1] - ref.y,
- nodes[n2][2] - ref.z);
+ /* fgPrintf( FG_TERRAIN, FG_DEBUG, " (cont)\n"); */
+
+ if ( use_per_vertex_norms ) {
+ MAT3_SCALE_VEC(normal, normals[n2], scale);
+ xglNormal3dv(normal);
+ } else {
+ if ( odd ) {
+ calc_normal(nodes[last1], nodes[last2], nodes[n2],
+ approx_normal);
+ } else {
+ calc_normal(nodes[last2], nodes[last1], nodes[n2],
+ approx_normal);
+ }
+ MAT3_SCALE_VEC(normal, approx_normal, scale);
+ xglNormal3dv(normal);
+ }
+
+ xglTexCoord2f(calc_lon(nodes[n2][0], nodes[n2][1], nodes[n2][2]), calc_lat(nodes[n2][0], nodes[n2][1], nodes[n2][2]));
+ xglVertex3d(nodes[n2][0], nodes[n2][1], nodes[n2][2]);
+
+ odd = 1 -odd;
+ last1 = last2;
+ last2 = n2;
}
} else {
- printf("Unknown line in %s = %s\n", path, line);
+ fgPrintf( FG_TERRAIN, FG_WARN, "Unknown line in %s = %s\n",
+ path, line);
}
}
- glEnd();
+ xglEnd();
/* Draw normal vectors (for visually verifying normals)*/
/*
- glBegin(GL_LINES);
- glColor3f(0.0, 0.0, 0.0);
+ xglBegin(GL_LINES);
+ xglColor3f(0.0, 0.0, 0.0);
for ( i = 0; i < ncount; i++ ) {
- glVertex3d(nodes[i][0] - ref.x,
- nodes[i][1] - ref.y,
- nodes[i][2] - ref.z);
- glVertex3d(nodes[i][0] - ref.x + 500*normals[i][0],
- nodes[i][1] - ref.y + 500*normals[i][1],
- nodes[i][2] - ref.z + 500*normals[i][2]);
+ xglVertex3d(nodes[i][0],
+ nodes[i][1] ,
+ nodes[i][2]);
+ xglVertex3d(nodes[i][0] + 500*normals[i][0],
+ nodes[i][1] + 500*normals[i][1],
+ nodes[i][2] + 500*normals[i][2]);
}
- glEnd();
+ xglEnd();
*/
- glEndList();
+ // xglDisable(GL_TEXTURE_GEN_S);
+ // xglDisable(GL_TEXTURE_GEN_T);
+
+ xglFrontFace ( GL_CCW );
+
+ xglEndList();
+
+ gzclose(f);
- fclose(f);
+ /* reference point is the "center" */
+ ref->x = (xmin + xmax) / 2.0;
+ ref->y = (ymin + ymax) / 2.0;
+ ref->z = (zmin + zmax) / 2.0;
- return(area);
+ return(tile);
}
/* $Log$
-/* Revision 1.8 1997/12/10 01:19:51 curt
-/* Tweaks for verion 0.15 release.
+/* Revision 1.28 1998/04/22 13:22:44 curt
+/* C++ - ifing the code a bit.
/*
+ * Revision 1.27 1998/04/18 04:13:17 curt
+ * Added zlib on the fly decompression support for loading scenery objects.
+ *
+ * Revision 1.26 1998/04/03 22:11:36 curt
+ * Converting to Gnu autoconf system.
+ *
+ * Revision 1.25 1998/03/14 00:30:50 curt
+ * Beginning initial terrain texturing experiments.
+ *
+ * Revision 1.24 1998/02/09 21:30:18 curt
+ * Fixed a nagging problem with terrain tiles not "quite" matching up perfectly.
+ *
+ * Revision 1.23 1998/02/09 15:07:52 curt
+ * Minor tweaks.
+ *
+ * Revision 1.22 1998/02/01 03:39:54 curt
+ * Minor tweaks.
+ *
+ * Revision 1.21 1998/01/31 00:43:25 curt
+ * Added MetroWorks patches from Carmen Volpe.
+ *
+ * Revision 1.20 1998/01/29 00:51:39 curt
+ * First pass at tile cache, dynamic tile loading and tile unloading now works.
+ *
+ * Revision 1.19 1998/01/27 03:26:42 curt
+ * Playing with new fgPrintf command.
+ *
+ * Revision 1.18 1998/01/19 19:27:16 curt
+ * Merged in make system changes from Bob Kuehne <rpk@sgi.com>
+ * This should simplify things tremendously.
+ *
+ * Revision 1.17 1998/01/13 00:23:10 curt
+ * Initial changes to support loading and management of scenery tiles. Note,
+ * there's still a fair amount of work left to be done.
+ *
+ * Revision 1.16 1997/12/30 23:09:40 curt
+ * Worked on winding problem without luck, so back to calling glFrontFace()
+ * 3 times for each scenery area.
+ *
+ * Revision 1.15 1997/12/30 20:47:51 curt
+ * Integrated new event manager with subsystem initializations.
+ *
+ * Revision 1.14 1997/12/30 01:38:46 curt
+ * Switched back to per vertex normals and smooth shading for terrain.
+ *
+ * Revision 1.13 1997/12/18 23:32:36 curt
+ * First stab at sky dome actually starting to look reasonable. :-)
+ *
+ * Revision 1.12 1997/12/17 23:13:47 curt
+ * Began working on rendering the sky.
+ *
+ * Revision 1.11 1997/12/15 23:55:01 curt
+ * Add xgl wrappers for debugging.
+ * Generate terrain normals on the fly.
+ *
+ * Revision 1.10 1997/12/12 21:41:28 curt
+ * More light/material property tweaking ... still a ways off.
+ *
+ * Revision 1.9 1997/12/12 19:52:57 curt
+ * Working on lightling and material properties.
+ *
+ * Revision 1.8 1997/12/10 01:19:51 curt
+ * Tweaks for verion 0.15 release.
+ *
* Revision 1.7 1997/12/08 22:51:17 curt
* Enhanced to handle ccw and cw tri-stripe winding. This is a temporary
* admission of defeat. I will eventually go back and get all the stripes
projects / flightgear.git / blobdiff