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#ifndef lint |
| 2 |
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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|
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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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|
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#include "random.h" |
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|
| 20 |
|
| 21 |
#define PI 3.14159265358979324 |
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|
| 23 |
#define ANGLE short |
| 24 |
#define AEND -1 |
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|
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#define atorad(a) ((PI/180.0) * (a)) |
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|
| 28 |
char otcom[128] = "oconv"; |
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char rtcom[256] = "rtrace -bf -ar .25 -ad 128"; |
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|
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char *sourcetemp, /* temp files */ |
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*octreetemp; |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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doscan(); |
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|
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quit(0); |
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return 0; /* pro forma return */ |
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} |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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"); |
| 333 |
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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|
| 337 |
|
| 338 |
static void |
| 339 |
sendsamples( /* send our samples to fp */ |
| 340 |
FILE *fp |
| 341 |
) |
| 342 |
{ |
| 343 |
ANGLE *a, *b; |
| 344 |
|
| 345 |
for (b = beta; *b != AEND; b++) |
| 346 |
for (a = alpha; *a != AEND; a++) |
| 347 |
writesample(fp, *a, *b); |
| 348 |
} |
| 349 |
|
| 350 |
|
| 351 |
static void |
| 352 |
writesample( /* write out sample ray grid */ |
| 353 |
FILE *fp, |
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ANGLE a, |
| 355 |
ANGLE b |
| 356 |
) |
| 357 |
{ |
| 358 |
float sp[6]; |
| 359 |
int i, j; |
| 360 |
|
| 361 |
sp[3] = -sin(atorad(b)-(PI/2.0)) * sin(atorad(a)); |
| 362 |
sp[4] = -cos(atorad(a)); |
| 363 |
sp[5] = -sin(atorad(b)) * sin(atorad(a)); |
| 364 |
|
| 365 |
for (j = 0; j < yres; j++) |
| 366 |
for (i = 0; i < xres; i++) { |
| 367 |
sp[0] = -100.0*sp[3] + |
| 368 |
(i - xres/2.0 + frandom())*targetw/xres; |
| 369 |
sp[1] = -100.0*sp[4] + |
| 370 |
(j - yres/2.0 + frandom())*targeth/yres; |
| 371 |
sp[2] = -100.0*sp[5]; |
| 372 |
fwrite(sp, sizeof(*sp), 6, fp); |
| 373 |
if (ferror(fp)) { |
| 374 |
fprintf(stderr, "Data write error\n"); |
| 375 |
quit(1); |
| 376 |
} |
| 377 |
} |
| 378 |
} |
| 379 |
|
| 380 |
|
| 381 |
static double |
| 382 |
readsample( /* read in sample ray grid */ |
| 383 |
FILE *fp |
| 384 |
) |
| 385 |
{ |
| 386 |
double sum; |
| 387 |
float col[3]; |
| 388 |
int i; |
| 389 |
|
| 390 |
sum = 0.0; |
| 391 |
i = xres*yres; |
| 392 |
while (i--) { |
| 393 |
if (fread(col, sizeof(*col), 3, fp) != 3) { |
| 394 |
fprintf(stderr, "Data read error\n"); |
| 395 |
quit(1); |
| 396 |
} |
| 397 |
sum += col[1]; |
| 398 |
} |
| 399 |
return(sum / (xres*yres)); |
| 400 |
} |
