flightgear/AssemTris/assemtris.cxx

// assemtris.cxx -- reassemble the pieces produced by splittris
//
// Written by Curtis Olson, started January 1998.
//
// Copyright (C) 1997  Curtis L. Olson  - curt@me.umn.edu
//
// 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.hxx"

#include <Include/fg_constants.h>
#include <Bucket/bucketutils.h>


// #define OFFSET_LON 0.1
// #define OFFSET_LAT 0.1

#define OFFSET_LON 0.0
#define OFFSET_LAT 0.0

int nodecount = 0;
int excount = 0;

static double nodes[MAX_NODES][3];
static double exnodes[MAX_NODES][3];


fgBUCKET my_index;
fgBUCKET ne_index, nw_index, sw_index, se_index;
fgBUCKET 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 to see if specified node is in the extra list
int is_extra_node(double *n) {
    int i;

    for ( i = 1; i <= excount; i++ ) {
	// we only check lon/lat in case the height got fooled with
	// along the way
	if ( (fabs(n[0] - exnodes[i][0]) < FG_EPSILON) &&
	     (fabs(n[1] - exnodes[i][1]) < FG_EPSILON) ) {
	    return(i);
	}
    }

    return(0);
}

// Read all the extra nodes.  These typically define inner areas to
// exclude from triangulations.  There will be a .poly file that
// refers to these by position number which assumes all the extra
// nodes come first in the generated .node file.
void read_extra_nodes(char *exfile) {
    FILE *fd;
    int i, junk1, junk2, junk3;

    // load extra nodes if they exist
    excount = 0;
    if ( (fd = fopen(exfile, "r")) != NULL ) {
	printf("Found and 'extra' node file = %s\n", exfile);
	fscanf(fd, "%d %d %d %d", &excount, &junk1, &junk2, &junk3);

	if ( excount > MAX_NODES - 1 ) {
	    printf("Error, too many 'extra' nodes, increase array size\n");
	    exit(-1);
	} else {
	    printf("    Expecting %d 'extra' nodes\n", excount);
	}

	for ( i = 1; i <= excount; i++ ) {
	    fscanf(fd, "%d %lf %lf %lf\n", &junk1, 
		   &exnodes[i][0], &exnodes[i][1], &exnodes[i][2]);
	    printf("(extra) %d %.2f %.2f %.2f\n", 
		    i, exnodes[i][0], exnodes[i][1], exnodes[i][2]);
	}
        fclose(fd);
    }
}


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

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

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

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

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

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

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

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

    if ( strcmp(ext, ".body") == 0 ) {
	fgBucketGenBasePath(&my_index, scene_path);
	index = fgBucketGenIndex(&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.)
// The specified offset values (in arcsec) are used to overlap the
// edges of the tile slightly to cover gaps induced by floating point
// precision problems.  1 arcsec == about 100 feet so 0.01 arcsec ==
// about 1 foot
void read_nodes(FILE *fp, double offset_lon, double offset_lat) {
    double n[3];
    char line[256];
    int ex_index;

    offset_lon = offset_lat = 0.0;

    while ( fgets(line, 250, fp) != NULL ) {
	if ( strncmp(line, "gdn ", 4) == 0 ) {
	    sscanf(line, "gdn %lf %lf %lf\n", &n[0], &n[1], &n[2]);

	    ex_index = is_extra_node(n);

	    if ( ex_index == 0 ) {
		// not an extra node
		nodes[nodecount][0] = n[0] + offset_lon;
		nodes[nodecount][1] = n[1] + offset_lat;
		nodes[nodecount][2] = n[2];

		// printf("read_nodes(%d) %.2f %.2f %.2f %s", nodecount, 
		//        nodes[nodecount][0], nodes[nodecount][1], 
		//        nodes[nodecount][2], line);
		     

		nodecount++;
	    } else {
		// is an extra node
		printf("found extra node %.2f %.2f %.2f\n", n[0], n[1], n[2]);
		// preserve the DEM altitude for now
		exnodes[ex_index][2] = n[2];
	    }
	}
    }
}


// load in nodes from the various split and shared pieces to
// reconstruct a tile
void build_node_list(char *basename, char *basepath) {
    char exfile[256];
    FILE *ne, *nw, *se, *sw, *north, *south, *east, *west, *body;

    // load extra nodes if they exist
    strcpy(exfile, basename);
    strcat(exfile, ".node.ex");
    read_extra_nodes(exfile);

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

    nw = my_open(basename, basepath, ".nw");
    read_nodes(nw, -1.0 * OFFSET_LON, OFFSET_LAT);
    fclose(nw);

    se = my_open(basename, basepath, ".se");
    read_nodes(se, OFFSET_LON, -1.0 * OFFSET_LAT);
    fclose(se);

    sw = my_open(basename, basepath, ".sw");
    read_nodes(sw, -1.0 * OFFSET_LON, -1.0 * OFFSET_LAT);
    fclose(sw);

    north = my_open(basename, basepath, ".north");
    read_nodes(north, 0.0, OFFSET_LAT);
    fclose(north);

    south = my_open(basename, basepath, ".south");
    read_nodes(south, 0.0, -1.0 * OFFSET_LAT);
    fclose(south);

    east = my_open(basename, basepath, ".east");
    read_nodes(east, OFFSET_LON, 0.0);
    fclose(east);

    west = my_open(basename, basepath, ".west");
    read_nodes(west, -1.0 * OFFSET_LON, 0.0);
    fclose(west);

    body = my_open(basename, basepath, ".body");
    read_nodes(body, 0.0, 0.0);
    fclose(body);
}


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

    // 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");
    fd = fopen(file, "w");

    fprintf(fd, "%d 2 1 0\n", excount + nodecount);

    // now write out extra node data
    for ( i = 1; i <= excount; i++ ) {
	fprintf(fd, "%d %.2f %.2f %.2f 0\n", 
		i, exnodes[i][0], exnodes[i][1], exnodes[i][2]);
    }

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

    fclose(fd);
}


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

    // derive base name
    strcpy(basename, argv[1]);
    len = strlen(basename);

    // 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);
    fgBucketParseIndex(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
    fgBucketOffset(&my_index, &ne_index,  1,  1);
    fgBucketOffset(&my_index, &nw_index, -1,  1);
    fgBucketOffset(&my_index, &se_index,  1, -1);
    fgBucketOffset(&my_index, &sw_index, -1, -1);

    fgBucketOffset(&my_index, &north_index,  0,  1);
    fgBucketOffset(&my_index, &south_index,  0, -1);
    fgBucketOffset(&my_index, &east_index,  1,  0);
    fgBucketOffset(&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 1.3  1998/11/02 18:25:40  curt
// Check for __CYGWIN__ (b20) as well as __CYGWIN32__ (pre b20 compilers)
// Other misc. tweaks.
//
// Revision 1.2  1998/09/25 19:38:01  curt
// Minor tweaks so that this actually compiles.
//
// Revision 1.1  1998/09/25 19:35:29  curt
// Renamed assemtris.[ch] to assemtris.[ch]xx
//
// Revision 1.13  1998/09/21 20:56:30  curt
// Changes to avoid setting airport area nodes back to their original
// elevations if they have been changed.
//
//
// Revision 1.12  1998/09/09 16:24:51  curt
// Fixed a bug in the handling of exclude files which was causing
//   a crash by calling fclose() on an invalid file handle.
// Removed overlapping offsets.
//
// Revision 1.11  1998/08/06 12:47:59  curt
// Removed overlap in tiles as a test.
//
// Revision 1.10  1998/07/21 04:34:20  curt
// Mods to handle extra nodes (i.e. preserve cutouts).
//
// Revision 1.9  1998/07/04 00:55:39  curt
// typedef'd struct fgBUCKET.
//
// Revision 1.8  1998/06/01 17:58:19  curt
// Added a slight border overlap to try to minimize pixel wide gaps between
// tiles due to round off error.  This is not a perfect solution, but helps.
//
// Revision 1.7  1998/04/14 02:26:00  curt
// Code reorganizations.  Added a Lib/ directory for more general libraries.
//
// Revision 1.6  1998/04/08 22:54:58  curt
// Adopted Gnu automake/autoconf system.
//
// Revision 1.5  1998/03/03 16:00:52  curt
// More c++ compile tweaks.
//
// Revision 1.4  1998/01/31 00:41:23  curt
// Made a few changes converting floats to doubles.
//
// Revision 1.3  1998/01/27 18:37:00  curt
// Lots of updates to get back in sync with changes made over in .../Src/
//
// 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.
//