flightgear/AssemTris/assemtris.c

/* splittris.c -- reassemble the pieces produced by splittris
 *
 * Written by Curtis Olson, started January 1998.
 *
 * 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 <math.h>
#include <stdio.h>
#include <stdlib.h>   /* for atoi() */
#include <string.h>
#include <sys/stat.h> /* for stat() */
#include <unistd.h>   /* for stat() */

#include "assemtris.h"

#include "../../Src/Include/constants.h"
#include "../../Src/Include/types.h"
#include "../../Src/Math/fg_geodesy.h"
#include "../../Src/Math/mat3.h"
#include "../../Src/Math/polar.h"
#include "../../Src/Scenery/tileutils.h"


int nodecount = 0;

float nodes[MAX_NODES][3];


struct bucket my_index;
struct bucket ne_index, nw_index, sw_index, se_index;
struct bucket north_index, south_index, east_index, west_index;


/* return the file base name ( foo/bar/file.ext = file.ext ) */
void extract_file(char *in, char *base) {
    int len, i;

    len = strlen(in);

    i = len - 1;
    while ( (i >= 0) && (in[i] != '/') ) {
	i--;
    }

    in += (i + 1);
    strcpy(base, in);
}


/* return the file path name ( foo/bar/file.ext = foo/bar ) */
void extract_path(char *in, char *base) {
    int len, i;

    len = strlen(in);
    strcpy(base, in);

    i = len - 1;
    while ( (i >= 0) && (in[i] != '/') ) {
	i--;
    }

    base[i] = '\0';
}


/* check if a file exists */
int file_exists(char *file) {
    struct stat stat_buf;
    int result;

    printf("checking %s ... ", file);

    result = stat(file, &stat_buf);

    if ( result != 0 ) {
	/* stat failed, no file */
	printf("not found.\n");
	return(0);
    } else {
	/* stat succeeded, file exists */
	printf("exists.\n");
	return(1);
    }
}


/* check to see if a shared object exists */
int shared_object_exists(char *basepath, char *ext, char *file) {
    char scene_path[256];
    long int index;

    if ( strcmp(ext, ".sw") == 0 ) {
	gen_base_path(&my_index, scene_path);
	index = gen_index(&my_index);
	sprintf(file, "%s/%s/%ld.1.sw", basepath, scene_path, index);
	if ( file_exists(file) ) {
	    return(1);
	}
	gen_base_path(&west_index, scene_path);
	index = gen_index(&west_index);
	sprintf(file, "%s/%s/%ld.1.se", basepath, scene_path, index);
	if ( file_exists(file) ) {
	    return(1);
	}
	gen_base_path(&sw_index, scene_path);
	index = gen_index(&sw_index);
	sprintf(file, "%s/%s/%ld.1.ne", basepath, scene_path, index);
	if ( file_exists(file) ) {
	    return(1);
	}
	gen_base_path(&south_index, scene_path);
	index = gen_index(&south_index);
	sprintf(file, "%s/%s/%ld.1.nw", basepath, scene_path, index);
	if ( file_exists(file) ) {
	    return(1);
	}
    }

    if ( strcmp(ext, ".se") == 0 ) {
	gen_base_path(&my_index, scene_path);
	index = gen_index(&my_index);
	sprintf(file, "%s/%s/%ld.1.se", basepath, scene_path, index);
	if ( file_exists(file) ) {
	    return(1);
	}
	gen_base_path(&east_index, scene_path);
	index = gen_index(&east_index);
	sprintf(file, "%s/%s/%ld.1.sw", basepath, scene_path, index);
	if ( file_exists(file) ) {
	    return(1);
	}
	gen_base_path(&se_index, scene_path);
	index = gen_index(&se_index);
	sprintf(file, "%s/%s/%ld.1.nw", basepath, scene_path, index);
	if ( file_exists(file) ) {
	    return(1);
	}
	gen_base_path(&south_index, scene_path);
	index = gen_index(&south_index);
	sprintf(file, "%s/%s/%ld.1.ne", basepath, scene_path, index);
	if ( file_exists(file) ) {
	    return(1);
	}
    }

    if ( strcmp(ext, ".ne") == 0 ) {
	gen_base_path(&my_index, scene_path);
	index = gen_index(&my_index);
	sprintf(file, "%s/%s/%ld.1.ne", basepath, scene_path, index);
	if ( file_exists(file) ) {
	    return(1);
	}
	gen_base_path(&east_index, scene_path);
	index = gen_index(&east_index);
	sprintf(file, "%s/%s/%ld.1.nw", basepath, scene_path, index);
	if ( file_exists(file) ) {
	    return(1);
	}
	gen_base_path(&ne_index, scene_path);
	index = gen_index(&ne_index);
	sprintf(file, "%s/%s/%ld.1.sw", basepath, scene_path, index);
	if ( file_exists(file) ) {
	    return(1);
	}
	gen_base_path(&north_index, scene_path);
	index = gen_index(&north_index);
	sprintf(file, "%s/%s/%ld.1.se", basepath, scene_path, index);
	if ( file_exists(file) ) {
	    return(1);
	}
    }

    if ( strcmp(ext, ".nw") == 0 ) {
	gen_base_path(&my_index, scene_path);
	index = gen_index(&my_index);
	sprintf(file, "%s/%s/%ld.1.nw", basepath, scene_path, index);
	if ( file_exists(file) ) {
	    return(1);
	}
	gen_base_path(&west_index, scene_path);
	index = gen_index(&west_index);
	sprintf(file, "%s/%s/%ld.1.ne", basepath, scene_path, index);
	if ( file_exists(file) ) {
	    return(1);
	}
	gen_base_path(&nw_index, scene_path);
	index = gen_index(&nw_index);
	sprintf(file, "%s/%s/%ld.1.se", basepath, scene_path, index);
	if ( file_exists(file) ) {
	    return(1);
	}
	gen_base_path(&north_index, scene_path);
	index = gen_index(&north_index);
	sprintf(file, "%s/%s/%ld.1.sw", basepath, scene_path, index);
	if ( file_exists(file) ) {
	    return(1);
	}
    }

    if ( strcmp(ext, ".south") == 0 ) {
	gen_base_path(&my_index, scene_path);
	index = gen_index(&my_index);
	sprintf(file, "%s/%s/%ld.1.south", basepath, scene_path, index);
	if ( file_exists(file) ) {
	    return(1);
	}
	gen_base_path(&south_index, scene_path);
	index = gen_index(&south_index);
	sprintf(file, "%s/%s/%ld.1.north", basepath, scene_path, index);
	if ( file_exists(file) ) {
	    return(1);
	}
    }

    if ( strcmp(ext, ".north") == 0 ) {
	gen_base_path(&my_index, scene_path);
	index = gen_index(&my_index);
	sprintf(file, "%s/%s/%ld.1.north", basepath, scene_path, index);
	if ( file_exists(file) ) {
	    return(1);
	}
	gen_base_path(&north_index, scene_path);
	index = gen_index(&north_index);
	sprintf(file, "%s/%s/%ld.1.south", basepath, scene_path, index);
	if ( file_exists(file) ) {
	    return(1);
	}
    }

    if ( strcmp(ext, ".west") == 0 ) {
	gen_base_path(&my_index, scene_path);
	index = gen_index(&my_index);
	sprintf(file, "%s/%s/%ld.1.west", basepath, scene_path, index);
	if ( file_exists(file) ) {
	    return(1);
	}
	gen_base_path(&west_index, scene_path);
	index = gen_index(&west_index);
	sprintf(file, "%s/%s/%ld.1.east", basepath, scene_path, index);
	if ( file_exists(file) ) {
	    return(1);
	}
    }

    if ( strcmp(ext, ".east") == 0 ) {
	gen_base_path(&my_index, scene_path);
	index = gen_index(&my_index);
	sprintf(file, "%s/%s/%ld.1.east", basepath, scene_path, index);
	if ( file_exists(file) ) {
	    return(1);
	}
	gen_base_path(&east_index, scene_path);
	index = gen_index(&east_index);
	sprintf(file, "%s/%s/%ld.1.west", basepath, scene_path, index);
	if ( file_exists(file) ) {
	    return(1);
	}
    }

    if ( strcmp(ext, ".body") == 0 ) {
	gen_base_path(&my_index, scene_path);
	index = gen_index(&my_index);
	sprintf(file, "%s/%s/%ld.1.body", basepath, scene_path, index);
	if ( file_exists(file) ) {
	    return(1);
	}
    }

    return(0);
}


/* my custom file opening routine ... don't open if a shared edge or
 * vertex alread exists */
FILE *my_open(char *basename, char *basepath, char *ext) {
    FILE *fp;
    char filename[256];

    /* check if a shared object already exists */
    if ( shared_object_exists(basepath, ext, filename) ) {
	/* not an actual file open error, but we've already got the
         * shared edge, so we don't want to create another one */
	fp = fopen(filename, "r");
	printf("Opening %s\n", filename);
	return(fp);
    } else {
	/* open the file */
	printf("not opening\n");
	return(NULL);
    }
}


/* given a file pointer, read all the gdn (geodetic nodes from it) */
void read_nodes(FILE *fp) {
    char line[256];

    while ( fgets(line, 250, fp) != NULL ) {
	if ( strncmp(line, "gdn ", 4) == 0 ) {
	    sscanf(line, "gdn %f %f %f\n", &nodes[nodecount][0], 
		   &nodes[nodecount][1], &nodes[nodecount][2]);
	    /*
	    printf("read_nodes(%d) %.2f %.2f %.2f %s", nodecount, 
		   nodes[nodecount][0], nodes[nodecount][1], 
		   nodes[nodecount][2], line);
		   */
	    nodecount++;
	}
    }
}


/* load in nodes from the various split and shared pieces to
 * reconstruct a tile */
void build_node_list(char *basename, char *basepath) {
    FILE *ne, *nw, *se, *sw, *north, *south, *east, *west, *body;

    ne = my_open(basename, basepath, ".ne");
    read_nodes(ne);
    fclose(ne);

    nw = my_open(basename, basepath, ".nw");
    read_nodes(nw);
    fclose(nw);

    se = my_open(basename, basepath, ".se");
    read_nodes(se);
    fclose(se);

    sw = my_open(basename, basepath, ".sw");
    read_nodes(sw);
    fclose(sw);

    north = my_open(basename, basepath, ".north");
    read_nodes(north);
    fclose(north);

    south = my_open(basename, basepath, ".south");
    read_nodes(south);
    fclose(south);

    east = my_open(basename, basepath, ".east");
    read_nodes(east);
    fclose(east);

    west = my_open(basename, basepath, ".west");
    read_nodes(west);
    fclose(west);

    body = my_open(basename, basepath, ".body");
    read_nodes(body);
    fclose(body);
}


/* dump in WaveFront .obj format */
void dump_nodes(char *basename) {
    char file[256];
    FILE *fp;
    int i, len;

    /* generate output file name */
    strcpy(file, basename);
    len = strlen(file);
    file[len-2] = '\0';
    strcat(file, ".node");
    
    /* dump vertices */
    printf("Creating node file:  %s\n", file);
    printf("  writing vertices in .node format.\n");
    fp = fopen(file, "w");

    fprintf(fp, "%d 2 1 0\n", nodecount);

    /* now write out actual node data */
    for ( i = 0; i < nodecount; i++ ) {
	fprintf(fp, "%d %.2f %.2f %.2f 0\n", i + 1,
	       nodes[i][0], nodes[i][1], nodes[i][2]);
    }

    fclose(fp);
}


int main(int argc, char **argv) {
    char basename[256], basepath[256], temp[256];
    long int tmp_index;
    int len;

    strcpy(basename, argv[1]);

    /* find the base path of the file */
    extract_path(basename, basepath);
    extract_path(basepath, basepath);
    extract_path(basepath, basepath);
    printf("%s\n", basepath);

    /* find the index of the current file */
    extract_file(basename, temp);
    len = strlen(temp);
    if ( len >= 2 ) {
	temp[len-2] = '\0';
    }
    tmp_index = atoi(temp);
    printf("%ld\n", tmp_index);
    parse_index(tmp_index, &my_index);

    printf("bucket = %d %d %d %d\n", 
	   my_index.lon, my_index.lat, my_index.x, my_index.y);
    /* generate the indexes of the neighbors */
    offset_bucket(&my_index, &ne_index,  1,  1);
    offset_bucket(&my_index, &nw_index, -1,  1);
    offset_bucket(&my_index, &se_index,  1, -1);
    offset_bucket(&my_index, &sw_index, -1, -1);

    offset_bucket(&my_index, &north_index,  0,  1);
    offset_bucket(&my_index, &south_index,  0, -1);
    offset_bucket(&my_index, &east_index,  1,  0);
    offset_bucket(&my_index, &west_index, -1,  0);

    /*
    printf("Corner indexes = %ld %ld %ld %ld\n", 
	   ne_index, nw_index, sw_index, se_index);
    printf("Edge indexes = %ld %ld %ld %ld\n",
	   north_index, south_index, east_index, west_index);
	   */

    /* load the input data files */
    build_node_list(basename, basepath);

    /* dump in WaveFront .obj format */
    dump_nodes(basename);

    return(0);
}


/* $Log$
/* Revision 1.2  1998/01/15 21:33:36  curt
/* Assembling triangles and building a new .node file with the proper shared
/* vertices now works.  Now we just have to use the shared normals and we'll
/* be all set.
/*
 * Revision 1.1  1998/01/15 02:45:26  curt
 * Initial revision.
 *
 */