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#ifndef lint
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static const char RCSid[] = "$Id: scanner.c,v 1.5 2004/03/26 23:34:23 schorsch Exp $";
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#endif
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/*
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* scanner.c - program to simulate bi-directional scanner.
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*
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* 6/10/86
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <signal.h>
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#include <math.h>
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#include <unistd.h> /* XXX pipe() fork() etc, use common/process.c instead */
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#include "random.h"
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#define PI 3.14159265358979324
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#define ANGLE short
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#define AEND -1
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#define atorad(a) ((PI/180.0) * (a))
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char otcom[128] = "oconv";
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char rtcom[256] = "rtrace -bf -ar .25 -ad 128";
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char *sourcetemp, /* temp files */
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*octreetemp;
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ANGLE alpha[181] = {90, AEND};
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ANGLE beta[181] = {30, 60, 90, 120, 150, AEND};
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ANGLE sgamma[181] = {45, AEND}; /* gamma() is a function from gnu <math.h> */
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char *target; /* target file name */
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double targetw = 3.0; /* target width (inches) */
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double targeth = 3.0; /* target height (inches) */
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int xres = 16; /* x sample resolution */
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int yres = 16; /* y sample resolution */
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static void quit(int code);
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static void setscan(ANGLE *ang, char *arg);
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static void doscan(void);
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static void scanend(FILE *fp);
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static void makesource(ANGLE g);
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static void sendsamples(FILE *fp);
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static void writesample(FILE *fp, ANGLE a, ANGLE b);
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static FILE * scanstart(ANGLE g);
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static double readsample(FILE *fp);
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int
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main(
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int argc,
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char *argv[]
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)
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{
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int i;
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#ifdef SIGHUP
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signal(SIGHUP, quit);
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#endif
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signal(SIGINT, quit);
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signal(SIGTERM, quit);
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#ifdef SIGXCPU
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signal(SIGXCPU, SIG_IGN);
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signal(SIGXFSZ, SIG_IGN);
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#endif
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for (i = 1; i < argc && argv[i][0] == '-'; i++)
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switch (argv[i][1]) {
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case 't': /* target */
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switch (argv[i][2]) {
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case 'w': /* width */
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targetw = atof(argv[++i]);
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break;
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case 'h': /* height */
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targeth = atof(argv[++i]);
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break;
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default:
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goto badopt;
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}
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break;
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case 'a':
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if (!strcmp(argv[i], "-alpha"))
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setscan(alpha, argv[++i]);
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else
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switch (argv[i][2]) {
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case 'd': /* ambient divisions */
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strcat(rtcom, " -ad ");
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strcat(rtcom, argv[++i]);
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break;
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case 'r': /* ambient radius */
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strcat(rtcom, " -ar ");
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strcat(rtcom, argv[++i]);
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break;
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default:
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goto badopt;
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}
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break;
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case 'b':
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if (!strcmp(argv[i], "-beta"))
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setscan(beta, argv[++i]);
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else
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goto badopt;
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break;
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case 'g':
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if (!strcmp(argv[i], "-gamma"))
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setscan(sgamma, argv[++i]);
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else
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goto badopt;
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break;
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case 'x': /* x resolution */
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xres = atoi(argv[++i]);
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break;
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case 'y': /* y resolution */
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yres = atoi(argv[++i]);
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break;
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case 'l':
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switch (argv[i][2]) {
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case 'w': /* limit weight */
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strcat(rtcom, " -lw ");
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strcat(rtcom, argv[++i]);
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break;
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case 'r': /* limit recursion */
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strcat(rtcom, " -lr ");
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strcat(rtcom, argv[++i]);
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break;
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default:
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goto badopt;
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}
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break;
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default:;
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badopt:
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fprintf(stderr, "%s: bad option: %s\n",
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argv[0], argv[i]);
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quit(1);
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}
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if (i >= argc) {
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fprintf(stderr, "%s: missing target file\n", argv[0]);
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quit(1);
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} else if (i < argc-1) {
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fprintf(stderr, "%s: too many target files\n", argv[0]);
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quit(1);
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}
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target = argv[i];
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sourcetemp = mktemp("/usr/tmp/soXXXXXX");
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octreetemp = mktemp("/usr/tmp/ocXXXXXX");
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strcat(strcat(otcom, " "), target);
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strcat(strcat(otcom, " "), sourcetemp);
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strcat(strcat(otcom, " > "), octreetemp);
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strcat(strcat(rtcom, " "), octreetemp);
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doscan();
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quit(0);
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return 0; /* pro forma return */
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}
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void
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quit( /* unlink temp files and exit */
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int code
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)
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{
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unlink(sourcetemp);
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unlink(octreetemp);
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exit(code);
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}
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static void
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setscan( /* set up scan according to arg */
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register ANGLE *ang,
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register char *arg
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)
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{
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int start = 0, finish = -1, step = 1;
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for ( ; ; ) {
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switch (*arg) {
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case '\0':
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case ',':
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while (start <= finish) {
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*ang++ = start;
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start += step;
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}
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if (*arg) {
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arg++;
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continue;
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} else {
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*ang = AEND;
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return;
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}
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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case '9':
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start = atoi(arg);
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finish = start;
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step = 1;
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break;
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case '-':
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finish = atoi(++arg);
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break;
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case ':':
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step = atoi(++arg);
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break;
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default:
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fprintf(stderr, "Scan specification error\n");
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quit(1);
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}
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while (isdigit(*arg))
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arg++;
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}
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}
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static void
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doscan(void) /* do scan for target */
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{
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FILE *fp;
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ANGLE *a, *b, *g;
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printf("Alpha\tBeta\tGamma\tDistribution for \"%s\"\n", target);
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for (g = sgamma; *g != AEND; g++) {
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fp = scanstart(*g);
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for (b = beta; *b != AEND; b++) /* read data */
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for (a = alpha; *a != AEND; a++)
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printf("%d\t%d\t%d\t%f\n",
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*a, *b, *g, readsample(fp));
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scanend(fp);
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}
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}
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static FILE *
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scanstart( /* open scanner pipeline */
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ANGLE g
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)
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{
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int p1[2], p2[2];
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int pid;
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FILE *fp;
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char buf[128];
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makesource(g); /* make source */
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if (system(otcom)) /* generate new octree */
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goto err;
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if (pipe(p1) < 0) /* get pipe1 */
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goto err;
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if ((pid = fork()) == 0) { /* if child1 */
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close(p1[0]);
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if (p1[1] != 1) { /* connect stdout to pipe1 */
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dup2(p1[1], 1);
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close(p1[1]);
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}
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if (pipe(p2) < 0) /* get pipe2 */
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goto err;
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if ((pid = fork()) == 0) { /* if child2 */
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close(p2[0]);
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if ((fp = fdopen(p2[1], "w")) == NULL)
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goto err;
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sendsamples(fp); /* send our samples to pipe2 */
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fclose(fp);
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_exit(0);
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}
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if (pid == -1)
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goto err;
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close(p2[1]);
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if (p2[0] != 0) { /* for child1 pipe2 to stdin */
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dup2(p2[0], 0);
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close(p2[0]);
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}
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execl("/bin/sh", "sh", "-c", rtcom, 0); /* run ray tracer */
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goto err;
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}
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if (pid == -1)
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goto err;
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close(p1[1]);
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if ((fp = fdopen(p1[0], "r")) == NULL) /* parent reads pipe1 */
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goto err;
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while (fgets(buf, sizeof(buf), fp) != NULL && buf[0] != '\n')
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/* discard header */;
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return(fp);
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err:
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fprintf(stderr, "System error in scanstart\n");
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quit(1);
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return NULL; /* pro forma return */
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}
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static void
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scanend( /* done with scanner input */
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FILE *fp
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)
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{
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fclose(fp);
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}
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static void
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makesource( /* make a source (output normalized) */
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ANGLE g
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)
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{
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FILE *fp;
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double srcdir[3];
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srcdir[0] = sin(atorad(g));
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srcdir[1] = 0.0;
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srcdir[2] = -cos(atorad(g));
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if ((fp = fopen(sourcetemp, "w")) == NULL) {
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fprintf(stderr, "%s: cannot create\n", sourcetemp);
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quit(1);
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}
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fprintf(fp, "0 0 0 1\n");
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fprintf(fp, "\nvoid light scanner_light\n");
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fprintf(fp, "0\n0\n3 3283 3283 3283\n");
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fprintf(fp, "\nscanner_light source scanner_source\n");
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fprintf(fp, "0\n0\n4 %f %f %f 2\n", srcdir[0], srcdir[1], srcdir[2]);
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fclose(fp);
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}
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static void
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sendsamples( /* send our samples to fp */
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FILE *fp
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)
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{
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ANGLE *a, *b;
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for (b = beta; *b != AEND; b++)
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for (a = alpha; *a != AEND; a++)
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writesample(fp, *a, *b);
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}
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| 351 |
static void
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writesample( /* write out sample ray grid */
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FILE *fp,
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ANGLE a,
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| 355 |
ANGLE b
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| 356 |
)
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| 357 |
{
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| 358 |
float sp[6];
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| 359 |
int i, j;
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| 361 |
sp[3] = -sin(atorad(b)-(PI/2.0)) * sin(atorad(a));
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sp[4] = -cos(atorad(a));
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sp[5] = -sin(atorad(b)) * sin(atorad(a));
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for (j = 0; j < yres; j++)
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for (i = 0; i < xres; i++) {
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sp[0] = -100.0*sp[3] +
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(i - xres/2.0 + frandom())*targetw/xres;
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sp[1] = -100.0*sp[4] +
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(j - yres/2.0 + frandom())*targeth/yres;
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sp[2] = -100.0*sp[5];
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fwrite(sp, sizeof(*sp), 6, fp);
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| 373 |
if (ferror(fp)) {
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| 374 |
fprintf(stderr, "Data write error\n");
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| 375 |
quit(1);
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}
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| 377 |
}
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| 378 |
}
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| 379 |
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| 380 |
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static double
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| 382 |
readsample( /* read in sample ray grid */
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| 383 |
FILE *fp
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| 384 |
)
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| 385 |
{
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| 386 |
double sum;
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| 387 |
float col[3];
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| 388 |
int i;
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| 389 |
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| 390 |
sum = 0.0;
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| 391 |
i = xres*yres;
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| 392 |
while (i--) {
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| 393 |
if (fread(col, sizeof(*col), 3, fp) != 3) {
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| 394 |
fprintf(stderr, "Data read error\n");
|
| 395 |
quit(1);
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| 396 |
}
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| 397 |
sum += col[1];
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| 398 |
}
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| 399 |
return(sum / (xres*yres));
|
| 400 |
}
|
