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#ifndef lint
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static const char RCSid[] = "$Id: rcode_norm.c,v 2.11 2025/06/04 22:34:27 greg Exp $";
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#endif
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/*
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* Encode and decode surface normal map using 32-bit integers
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*/
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#include "copyright.h"
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#include <stdlib.h>
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#include "platform.h"
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#include "rtio.h"
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#include "rtmath.h"
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#include "normcodec.h"
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/* Report usage error and exit */
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static void
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usage_exit(int code)
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{
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fputs("Usage: ", stderr);
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fputs(progname, stderr);
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fputs(" [-h[io]][-H[io]][-f[afd]][-x xr -y yr] [input [output.nrm]]\n", stderr);
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fputs(" Or: ", stderr);
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fputs(progname, stderr);
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fputs(" -r [-i][-u][-h[io]][-H[io]][-f[afd]] [input.nrm [output]]\n",
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stderr);
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exit(code);
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}
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/* Encode normals from input stream */
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static int
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encode_normals(NORMCODEC *ncp)
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{
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long nexpected = (long)ncp->res.xr * ncp->res.yr;
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if (ncp->inpfmt[0]) {
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if (!strcmp(ncp->inpfmt, "ascii"))
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ncp->format = 'a';
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else if (!strcmp(ncp->inpfmt, "float"))
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ncp->format = 'f';
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else if (!strcmp(ncp->inpfmt, "double"))
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ncp->format = 'd';
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else {
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fputs(ncp->inpname, stderr);
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fputs(": unsupported input format: ", stderr);
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fputs(ncp->inpfmt, stderr);
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fputc('\n', stderr);
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return 0;
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}
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}
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if (ncp->format == 'a')
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SET_FILE_TEXT(ncp->finp);
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do {
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int ok = 0;
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FVECT nrm;
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switch (ncp->format) {
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case 'a':
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ok = (fscanf(ncp->finp, FVFORMAT,
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&nrm[0], &nrm[1], &nrm[2]) == 3);
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break;
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#ifdef SMLFLT
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case 'f':
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ok = (getbinary(nrm, sizeof(*nrm), 3, ncp->finp) == 3);
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if (ncp->swapped)
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swap32((char *)nrm, 3);
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break;
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case 'd': {
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double nrmd[3];
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ok = (getbinary(nrmd, sizeof(*nrmd),
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3, ncp->finp) == 3);
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if (ncp->swapped)
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swap64((char *)nrmd, 3);
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if (ok) VCOPY(nrm, nrmd);
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} break;
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#else
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case 'f': {
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float nrmf[3];
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ok = (getbinary(nrmf, sizeof(*nrmf),
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3, ncp->finp) == 3);
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if (ncp->swapped)
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swap32((char *)nrmf, 3);
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if (ok) VCOPY(nrm, nrmf);
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} break;
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case 'd':
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ok = (getbinary(nrm, sizeof(*nrm), 3, ncp->finp) == 3);
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if (ncp->swapped)
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swap64((char *)nrm, 3);
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break;
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#endif
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}
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if (!ok)
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break;
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normalize(nrm);
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putint(encodedir(nrm), 4, stdout);
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} while (--nexpected);
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if (nexpected > 0) {
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fputs(ncp->inpname, stderr);
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fputs(": fewer normals than expected\n", stderr);
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return 0;
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}
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return 1;
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}
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/* Output the given normal to stdout */
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static void
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output_normal(NORMCODEC *ncp, FVECT nrm)
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{
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switch (ncp->format) {
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case 'a':
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printf("%.9f %.9f %.9f\n", nrm[0], nrm[1], nrm[2]);
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break;
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#ifdef SMLFLT
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case 'f':
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putbinary(nrm, sizeof(*nrm), 3, stdout);
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break;
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case 'd': {
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double nrmd[3];
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VCOPY(nrmd, nrm);
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putbinary(nrmd, sizeof(*nrmd), 3, stdout);
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}
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break;
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#else
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case 'f': {
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float nrmf[3];
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VCOPY(nrmf, nrm);
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putbinary(nrmf, sizeof(*nrmf), 3, stdout);
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}
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break;
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case 'd':
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putbinary(nrm, sizeof(*nrm), 3, stdout);
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break;
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#endif
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}
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}
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/* Decode normals from input stream */
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static int
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decode_normals(NORMCODEC *ncp)
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{
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long nexpected = (long)ncp->res.xr * ncp->res.yr;
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if (!check_decode_normals(ncp))
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return 0;
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do {
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FVECT nrm;
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if (decode_normal_next(nrm, ncp) < 0)
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break;
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output_normal(ncp, nrm);
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} while (--nexpected);
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if (nexpected > 0) {
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fputs(ncp->inpname, stderr);
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fputs(": unexpected EOF\n", stderr);
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return 0;
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}
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return 1;
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}
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/* Decode normals at particular pixels given on standard input */
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static int
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pixel_normals(NORMCODEC *ncp, int unbuf)
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{
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int x, y;
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FVECT nrm;
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if (ncp->finp == stdin) {
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fputs(progname, stderr);
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fputs(": <stdin> used for encoded normals\n", stderr);
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return 0;
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}
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if (!check_decode_normals(ncp))
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return 0;
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if (ncp->res.rt != PIXSTANDARD) {
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fputs(progname, stderr);
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fputs(": can only handle standard pixel ordering\n", stderr);
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return 0;
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}
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while (scanf("%d %d", &x, &y) == 2) {
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y = ncp->res.yr-1 - y;
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if (decode_normal_pix(nrm, ncp, x, y) < 0)
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return 0;
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output_normal(ncp, nrm);
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if (unbuf && fflush(stdout) == EOF) {
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fputs(progname, stderr);
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fputs(": write error on output\n", stderr);
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return 0;
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}
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}
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if (!feof(stdin)) {
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fputs(progname, stderr);
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fputs(": non-integer as pixel index\n", stderr);
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return 0;
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}
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return 1;
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}
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int
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main(int argc, char *argv[])
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{
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int xres=0, yres=0;
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int reverse = 0;
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int bypixel = 0;
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int unbuffered = 0;
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NORMCODEC nc;
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int a;
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/* set global progname */
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fixargv0(argv[0]);
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set_nc_defaults(&nc);
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nc.hdrflags = HF_ALL;
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for (a = 1; a < argc && argv[a][0] == '-'; a++)
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switch (argv[a][1]) {
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case 'r':
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reverse++;
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break;
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case 'f':
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switch (argv[a][2]) {
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case 'f':
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case 'd':
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case 'a':
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nc.format = argv[a][2];
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break;
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default:
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fputs(progname, stderr);
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fputs(": unsupported -f? format\n", stderr);
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usage_exit(1);
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}
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break;
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case 'h':
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switch (argv[a][2]) {
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case '\0':
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nc.hdrflags &= ~(HF_HEADIN|HF_HEADOUT);
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break;
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case 'i':
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case 'I':
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nc.hdrflags &= ~HF_HEADIN;
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break;
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case 'o':
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case 'O':
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nc.hdrflags &= ~HF_HEADOUT;
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break;
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default:
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usage_exit(1);
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}
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break;
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case 'H':
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switch (argv[a][2]) {
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case '\0':
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nc.hdrflags &= ~(HF_RESIN|HF_RESOUT);
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break;
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case 'i':
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case 'I':
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nc.hdrflags &= ~HF_RESIN;
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break;
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case 'o':
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case 'O':
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nc.hdrflags &= ~HF_RESOUT;
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break;
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default:
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usage_exit(1);
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}
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break;
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case 'x':
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xres = atoi(argv[++a]);
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break;
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case 'y':
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yres = atoi(argv[++a]);
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break;
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case 'i':
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bypixel++;
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break;
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case 'u':
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unbuffered++;
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break;
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default:
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usage_exit(1);
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}
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nc.hdrflags |= !reverse * HF_ENCODE;
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if ((xres > 0) & (yres > 0)) {
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nc.hdrflags &= ~HF_RESIN;
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nc.res.rt = PIXSTANDARD;
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nc.res.xr = xres;
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nc.res.yr = yres;
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} else if ((nc.hdrflags & (HF_RESIN|HF_RESOUT)) == HF_RESOUT) {
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fputs(progname, stderr);
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fputs(": unknown resolution for output\n", stderr);
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return 1;
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}
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if (bypixel) {
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if (!reverse) {
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fputs(progname, stderr);
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fputs(": -i only supported with -r option\n",
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stderr);
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usage_exit(1);
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}
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if (a >= argc) {
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fputs(progname, stderr);
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fputs(": -i option requires input file\n", stderr);
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usage_exit(1);
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}
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if (!(nc.hdrflags & HF_RESIN)) {
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fputs(progname, stderr);
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fputs(": -i option requires input resolution\n", stderr);
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usage_exit(1);
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}
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nc.hdrflags &= ~HF_RESOUT;
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}
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if (a < argc-2) {
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fputs(progname, stderr);
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fputs(": too many file arguments\n", stderr);
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usage_exit(1);
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}
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if (a < argc && !(nc.finp = fopen(nc.inpname=argv[a], "r"))) {
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fputs(nc.inpname, stderr);
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fputs(": cannot open for reading\n", stderr);
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return 1;
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}
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if (a+1 < argc && !freopen(argv[a+1], "w", stdout)) {
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fputs(argv[a+1], stderr);
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fputs(": cannot open for writing\n", stderr);
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return 1;
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}
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SET_FILE_BINARY(nc.finp); /* starting assumption */
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SET_FILE_BINARY(stdout);
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#ifdef getc_unlocked /* avoid stupid semaphores */
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flockfile(nc.finp);
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flockfile(stdout);
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#endif
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/* read/copy header */
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if (!process_nc_header(&nc, a, argv))
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return 1;
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if (reverse && nc.format == 'a')
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SET_FILE_TEXT(stdout);
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/* process data */
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if (!reverse) {
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if (!encode_normals(&nc))
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return 1;
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} else if (bypixel) {
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if (!pixel_normals(&nc, unbuffered))
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return 1;
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} else if (!decode_normals(&nc))
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return 1;
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if (fflush(stdout) == EOF) {
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fputs(progname, stderr);
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fputs(": error writing output\n", stderr);
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return 1;
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}
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return 0;
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}
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