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#ifndef lint |
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static const char RCSid[] = "$Id: rcode_norm.c,v 2.10 2025/06/03 21:31:51 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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|
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#include "copyright.h" |
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|
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#include <stdlib.h> |
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#include "platform.h" |
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#include "paths.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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|
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|
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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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|
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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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|
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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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|
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do { |
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int ok = 0; |
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FVECT nrm; |
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|
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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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|
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normalize(nrm); |
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putint(encodedir(nrm), 4, stdout); |
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|
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} while (--nexpected); |
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|
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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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|
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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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|
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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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|
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if (!check_decode_normals(ncp)) |
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return 0; |
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|
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do { |
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FVECT nrm; |
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|
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if (decode_normal_next(nrm, ncp) < 0) |
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break; |
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|
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output_normal(ncp, nrm); |
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|
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} while (--nexpected); |
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|
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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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|
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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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|
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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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|
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while (scanf("%d %d", &x, &y) == 2) { |
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|
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y = ncp->res.yr-1 - y; |
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|
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if (decode_normal_pix(nrm, ncp, x, y) < 0) |
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return 0; |
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|
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output_normal(ncp, nrm); |
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|
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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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|
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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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|
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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"))) { |
| 335 |
fputs(nc.inpname, stderr); |
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fputs(": cannot open for reading\n", stderr); |
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return 1; |
| 338 |
} |
| 339 |
if (a+1 < argc && !freopen(argv[a+1], "w", stdout)) { |
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fputs(argv[a+1], stderr); |
| 341 |
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 */ |
| 345 |
SET_FILE_BINARY(stdout); |
| 346 |
#ifdef getc_unlocked /* avoid stupid semaphores */ |
| 347 |
flockfile(nc.finp); |
| 348 |
flockfile(stdout); |
| 349 |
#endif |
| 350 |
/* read/copy header */ |
| 351 |
if (!process_nc_header(&nc, a, argv)) |
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return 1; |
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|
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if (reverse && nc.format == 'a') |
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SET_FILE_TEXT(stdout); |
| 356 |
/* process data */ |
| 357 |
if (!reverse) { |
| 358 |
if (!encode_normals(&nc)) |
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return 1; |
| 360 |
} else if (bypixel) { |
| 361 |
if (!pixel_normals(&nc, unbuffered)) |
| 362 |
return 1; |
| 363 |
} else if (!decode_normals(&nc)) |
| 364 |
return 1; |
| 365 |
|
| 366 |
if (fflush(stdout) == EOF) { |
| 367 |
fputs(progname, stderr); |
| 368 |
fputs(": error writing output\n", stderr); |
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return 1; |
| 370 |
} |
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return 0; |
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} |
