2 * FFT based normalmap to heightmap converter
3 * Copyright (C) 2010 Rudolf Polzer
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 #if __STDC_VERSION__ >= 199901L
36 #define TWO_PI (4*atan2(1,1) * 2)
38 void nmap_to_hmap(unsigned char *map, const unsigned char *refmap, int w, int h, double scale, double offset)
49 fftw_complex *imgspace1 = fftw_malloc(w*h * sizeof(fftw_complex));
50 fftw_complex *imgspace2 = fftw_malloc(w*h * sizeof(fftw_complex));
51 fftw_complex *freqspace1 = fftw_malloc(w*h * sizeof(fftw_complex));
52 fftw_complex *freqspace2 = fftw_malloc(w*h * sizeof(fftw_complex));
53 fftw_plan i12f1 = fftw_plan_dft_2d(h, w, imgspace1, freqspace1, FFTW_FORWARD, FFTW_ESTIMATE);
54 fftw_plan i22f2 = fftw_plan_dft_2d(h, w, imgspace2, freqspace2, FFTW_FORWARD, FFTW_ESTIMATE);
55 fftw_plan f12i1 = fftw_plan_dft_2d(h, w, freqspace1, imgspace1, FFTW_BACKWARD, FFTW_ESTIMATE);
57 for(y = 0; y < h; ++y)
58 for(x = 0; x < w; ++x)
61 * unnormalized normals:
65 * BUT: darkplaces uses inverted normals, n_y actually is dh/dy by image pixel coordinates
67 nx = ((int)map[(w*y+x)*4+2] - 127.5) / 128;
68 ny = ((int)map[(w*y+x)*4+1] - 127.5) / 128;
69 nz = ((int)map[(w*y+x)*4+0] - 127.5) / 128;
71 /* reconstruct the derivatives from here */
73 imgspace1[(w*y+x)] = nx / nz * w; /* = dz/dx */
74 imgspace2[(w*y+x)] = -ny / nz * h; /* = dz/dy */
76 imgspace1[(w*y+x)][0] = nx / nz; /* = dz/dx */
77 imgspace1[(w*y+x)][1] = 0;
78 imgspace2[(w*y+x)][0] = -ny / nz; /* = dz/dy */
79 imgspace2[(w*y+x)][1] = 0;
83 /* see http://www.gamedev.net/community/forums/topic.asp?topic_id=561430 */
88 for(y = 0; y < h; ++y)
89 for(x = 0; x < w; ++x)
97 /* these must have the same sign as fx and fy (so ffx*fx + ffy*fy is nonzero), otherwise do not matter */
102 freqspace1[(w*y+x)] = _Complex_I * (ffx * freqspace1[(w*y+x)] + ffy * freqspace2[(w*y+x)]) / (ffx*fx + ffy*fy) / TWO_PI;
104 freqspace1[(w*y+x)] = 0;
108 save = freqspace1[(w*y+x)][0];
109 freqspace1[(w*y+x)][0] = -(ffx * freqspace1[(w*y+x)][1] + ffy * freqspace2[(w*y+x)][1]) / (ffx*fx + ffy*fy) / TWO_PI;
110 freqspace1[(w*y+x)][1] = (ffx * save + ffy * freqspace2[(w*y+x)][0]) / (ffx*fx + ffy*fy) / TWO_PI;
114 freqspace1[(w*y+x)][0] = 0;
115 freqspace1[(w*y+x)][1] = 0;
122 /* renormalize, find min/max */
124 for(y = 0; y < h; ++y)
125 for(x = 0; x < w; ++x)
128 v = creal(imgspace1[(w*y+x)] /= (w*h));
130 v = (imgspace1[(w*y+x)][0] /= (w*h));
131 imgspace1[(w*y+x)][1] /= (w*h);
133 if(v < vmin || (x == 0 && y == 0))
135 if(v > vmax || (x == 0 && y == 0))
143 double sa, sfa, sffa, sfva, sva;
145 sa = sfa = sffa = sfva = sva = 0;
148 for(y = 0; y < h; ++y)
149 for(x = 0; x < w; ++x)
151 a = (int)refmap[(w*y+x)*4+3];
152 v = (refmap[(w*y+x)*4+0]*0.114 + refmap[(w*y+x)*4+1]*0.587 + refmap[(w*y+x)*4+2]*0.299);
153 v = (v - 128.0) / 127.0;
155 f = creal(imgspace1[(w*y+x)]);
157 f = imgspace1[(w*y+x)][0];
173 /* linear regression ftw */
174 o = (sfa*sfva - sffa*sva) / (sfa*sfa-sa*sffa);
175 s = (sfa*sva - sa*sfva) / (sfa*sfa-sa*sffa);
177 else /* all values of v are equal, so we cannot get scale; we can still get offset */
179 o = ((sva - sfa) / sa);
184 * now apply user-given offset and scale to these values
185 * (x * s + o) * scale + offset
186 * x * s * scale + o * scale + offset
197 scale = 2 / (vmax - vmin);
198 offset = -(vmax + vmin) / (vmax - vmin);
201 printf("Min: %f\nAvg: %f\nMax: %f\nScale: %f\nOffset: %f\nScaled-Min: %f\nScaled-Avg: %f\nScaled-Max: %f\n",
202 vmin, 0.0, vmax, scale, offset, vmin * scale + offset, offset, vmax * scale + offset);
204 for(y = 0; y < h; ++y)
205 for(x = 0; x < w; ++x)
208 v = creal(imgspace1[(w*y+x)]);
210 v = imgspace1[(w*y+x)][0];
212 v = v * scale + offset;
217 map[(w*y+x)*4+3] = floor(128.5 + 127 * v);
220 fftw_destroy_plan(i12f1);
221 fftw_destroy_plan(i22f2);
222 fftw_destroy_plan(f12i1);
224 fftw_free(freqspace2);
225 fftw_free(freqspace1);
226 fftw_free(imgspace2);
227 fftw_free(imgspace1);
230 void hmap_to_nmap(unsigned char *map, int w, int h, int src_chan, double scale)
239 fftw_complex *imgspace1 = fftw_malloc(w*h * sizeof(fftw_complex));
240 fftw_complex *imgspace2 = fftw_malloc(w*h * sizeof(fftw_complex));
241 fftw_complex *freqspace1 = fftw_malloc(w*h * sizeof(fftw_complex));
242 fftw_complex *freqspace2 = fftw_malloc(w*h * sizeof(fftw_complex));
243 fftw_plan i12f1 = fftw_plan_dft_2d(h, w, imgspace1, freqspace1, FFTW_FORWARD, FFTW_ESTIMATE);
244 fftw_plan f12i1 = fftw_plan_dft_2d(h, w, freqspace1, imgspace1, FFTW_BACKWARD, FFTW_ESTIMATE);
245 fftw_plan f22i2 = fftw_plan_dft_2d(h, w, freqspace2, imgspace2, FFTW_BACKWARD, FFTW_ESTIMATE);
247 for(y = 0; y < h; ++y)
248 for(x = 0; x < w; ++x)
256 v = map[(w*y+x)*4+src_chan];
259 v = (map[(w*y+x)*4+0] + map[(w*y+x)*4+1] + map[(w*y+x)*4+2]) / 3;
263 v = (map[(w*y+x)*4+0]*0.114 + map[(w*y+x)*4+1]*0.587 + map[(w*y+x)*4+2]*0.299);
267 imgspace1[(w*y+x)] = (v - 128.0) / 127.0;
269 imgspace1[(w*y+x)][0] = (v - 128.0) / 127.0;
270 imgspace1[(w*y+x)][1] = 0;
272 map[(w*y+x)*4+3] = floor(v + 0.5);
275 /* see http://www.gamedev.net/community/forums/topic.asp?topic_id=561430 */
279 for(y = 0; y < h; ++y)
280 for(x = 0; x < w; ++x)
289 /* a lowpass to prevent the worst */
290 freqspace1[(w*y+x)] *= 1 - pow(abs(fx) / (double)(w/2), 1);
291 freqspace1[(w*y+x)] *= 1 - pow(abs(fy) / (double)(h/2), 1);
293 freqspace2[(w*y+x)] = TWO_PI*_Complex_I * fy * freqspace1[(w*y+x)]; /* y derivative */
294 freqspace1[(w*y+x)] = TWO_PI*_Complex_I * fx * freqspace1[(w*y+x)]; /* x derivative */
296 /* a lowpass to prevent the worst */
297 freqspace1[(w*y+x)][0] *= 1 - pow(abs(fx) / (double)(w/2), 1);
298 freqspace1[(w*y+x)][1] *= 1 - pow(abs(fx) / (double)(w/2), 1);
299 freqspace1[(w*y+x)][0] *= 1 - pow(abs(fy) / (double)(h/2), 1);
300 freqspace1[(w*y+x)][1] *= 1 - pow(abs(fy) / (double)(h/2), 1);
302 freqspace2[(w*y+x)][0] = -TWO_PI * fy * freqspace1[(w*y+x)][1]; /* y derivative */
303 freqspace2[(w*y+x)][1] = TWO_PI * fy * freqspace1[(w*y+x)][0];
304 save = freqspace1[(w*y+x)][0];
305 freqspace1[(w*y+x)][0] = -TWO_PI * fx * freqspace1[(w*y+x)][1]; /* x derivative */
306 freqspace1[(w*y+x)][1] = TWO_PI * fx * save;
315 for(y = 0; y < h; ++y)
316 for(x = 0; x < w; ++x)
319 nx = creal(imgspace1[(w*y+x)]);
320 ny = creal(imgspace2[(w*y+x)]);
322 nx = imgspace1[(w*y+x)][0];
323 ny = imgspace2[(w*y+x)][0];
328 v = -sqrt(nx*nx + ny*ny + nz*nz);
332 ny = -ny; /* DP inverted normals */
333 map[(w*y+x)*4+2] = floor(128 + 127.5 * nx);
334 map[(w*y+x)*4+1] = floor(128 + 127.5 * ny);
335 map[(w*y+x)*4+0] = floor(128 + 127.5 * nz);
338 fftw_destroy_plan(i12f1);
339 fftw_destroy_plan(f12i1);
340 fftw_destroy_plan(f22i2);
342 fftw_free(freqspace2);
343 fftw_free(freqspace1);
344 fftw_free(imgspace2);
345 fftw_free(imgspace1);
348 void hmap_to_nmap_local(unsigned char *map, int w, int h, int src_chan, double scale)
354 double *img_reduced = malloc(w*h * sizeof(double));
355 static const double filter[3][3] = { /* filter to derive one component */
360 static const double filter_mult = 0.125;
362 for(y = 0; y < h; ++y)
363 for(x = 0; x < w; ++x)
371 v = map[(w*y+x)*4+src_chan];
374 v = (map[(w*y+x)*4+0] + map[(w*y+x)*4+1] + map[(w*y+x)*4+2]) / 3;
378 v = (map[(w*y+x)*4+0]*0.114 + map[(w*y+x)*4+1]*0.587 + map[(w*y+x)*4+2]*0.299);
381 img_reduced[(w*y+x)] = (v - 128.0) / 127.0;
382 map[(w*y+x)*4+3] = floor(v + 0.5);
385 for(y = 0; y < h; ++y)
386 for(x = 0; x < w; ++x)
388 nz = -1 / (scale * filter_mult);
391 for(i = -(int)(sizeof(filter) / sizeof(*filter)) / 2; i <= (int)(sizeof(filter) / sizeof(*filter)) / 2; ++i)
392 for(j = -(int)(sizeof(*filter) / sizeof(**filter)) / 2; j <= (int)(sizeof(*filter) / sizeof(**filter)) / 2; ++j)
394 nx += img_reduced[w*((y+i+h)%h)+(x+j+w)%w] * filter[i+(sizeof(filter) / sizeof(*filter)) / 2][j+(sizeof(*filter) / sizeof(**filter)) / 2];
395 ny += img_reduced[w*((y+j+h)%h)+(x+i+w)%w] * filter[i+(sizeof(filter) / sizeof(*filter)) / 2][j+(sizeof(*filter) / sizeof(**filter)) / 2];
398 v = -sqrt(nx*nx + ny*ny + nz*nz);
402 ny = -ny; /* DP inverted normals */
403 map[(w*y+x)*4+2] = floor(128 + 127.5 * nx);
404 map[(w*y+x)*4+1] = floor(128 + 127.5 * ny);
405 map[(w*y+x)*4+0] = floor(128 + 127.5 * nz);
411 unsigned char *FS_LoadFile(const char *fn, int *len)
413 unsigned char *buf = NULL;
415 FILE *f = fopen(fn, "rb");
421 buf = realloc(buf, *len + 65536);
429 n = fread(buf + *len, 1, 65536, f);
444 int FS_WriteFile(const char *fn, unsigned char *data, int len)
446 FILE *f = fopen(fn, "wb");
449 if(fwrite(data, len, 1, f) != 1)
459 /* START stuff that originates from image.c in DarkPlaces */
460 int image_width, image_height;
462 typedef struct _TargaHeader
464 unsigned char id_length, colormap_type, image_type;
465 unsigned short colormap_index, colormap_length;
466 unsigned char colormap_size;
467 unsigned short x_origin, y_origin, width, height;
468 unsigned char pixel_size, attributes;
472 void PrintTargaHeader(TargaHeader *t)
474 printf("TargaHeader:\nuint8 id_length = %i;\nuint8 colormap_type = %i;\nuint8 image_type = %i;\nuint16 colormap_index = %i;\nuint16 colormap_length = %i;\nuint8 colormap_size = %i;\nuint16 x_origin = %i;\nuint16 y_origin = %i;\nuint16 width = %i;\nuint16 height = %i;\nuint8 pixel_size = %i;\nuint8 attributes = %i;\n", t->id_length, t->colormap_type, t->image_type, t->colormap_index, t->colormap_length, t->colormap_size, t->x_origin, t->y_origin, t->width, t->height, t->pixel_size, t->attributes);
477 unsigned char *LoadTGA_BGRA (const unsigned char *f, int filesize)
479 int x, y, pix_inc, row_inci, runlen, alphabits;
480 unsigned char *image_buffer;
481 unsigned int *pixbufi;
482 const unsigned char *fin, *enddata;
483 TargaHeader targa_header;
484 unsigned int palettei[256];
495 enddata = f + filesize;
497 targa_header.id_length = f[0];
498 targa_header.colormap_type = f[1];
499 targa_header.image_type = f[2];
501 targa_header.colormap_index = f[3] + f[4] * 256;
502 targa_header.colormap_length = f[5] + f[6] * 256;
503 targa_header.colormap_size = f[7];
504 targa_header.x_origin = f[8] + f[9] * 256;
505 targa_header.y_origin = f[10] + f[11] * 256;
506 targa_header.width = image_width = f[12] + f[13] * 256;
507 targa_header.height = image_height = f[14] + f[15] * 256;
508 targa_header.pixel_size = f[16];
509 targa_header.attributes = f[17];
511 if (image_width > 32768 || image_height > 32768 || image_width <= 0 || image_height <= 0)
513 printf("LoadTGA: invalid size\n");
514 PrintTargaHeader(&targa_header);
518 /* advance to end of header */
521 /* skip TARGA image comment (usually 0 bytes) */
522 fin += targa_header.id_length;
524 /* read/skip the colormap if present (note: according to the TARGA spec it */
525 /* can be present even on 1color or greyscale images, just not used by */
526 /* the image data) */
527 if (targa_header.colormap_type)
529 if (targa_header.colormap_length > 256)
531 printf("LoadTGA: only up to 256 colormap_length supported\n");
532 PrintTargaHeader(&targa_header);
535 if (targa_header.colormap_index)
537 printf("LoadTGA: colormap_index not supported\n");
538 PrintTargaHeader(&targa_header);
541 if (targa_header.colormap_size == 24)
543 for (x = 0;x < targa_header.colormap_length;x++)
549 palettei[x] = bgra.i;
552 else if (targa_header.colormap_size == 32)
554 memcpy(palettei, fin, targa_header.colormap_length*4);
555 fin += targa_header.colormap_length * 4;
559 printf("LoadTGA: Only 32 and 24 bit colormap_size supported\n");
560 PrintTargaHeader(&targa_header);
565 /* check our pixel_size restrictions according to image_type */
566 switch (targa_header.image_type & ~8)
569 if (targa_header.pixel_size != 24 && targa_header.pixel_size != 32)
571 printf("LoadTGA: only 24bit and 32bit pixel sizes supported for type 2 and type 10 images\n");
572 PrintTargaHeader(&targa_header);
577 /* set up a palette to make the loader easier */
578 for (x = 0;x < 256;x++)
580 bgra.b[0] = bgra.b[1] = bgra.b[2] = x;
582 palettei[x] = bgra.i;
584 /* fall through to colormap case */
586 if (targa_header.pixel_size != 8)
588 printf("LoadTGA: only 8bit pixel size for type 1, 3, 9, and 11 images supported\n");
589 PrintTargaHeader(&targa_header);
594 printf("LoadTGA: Only type 1, 2, 3, 9, 10, and 11 targa RGB images supported, image_type = %i\n", targa_header.image_type);
595 PrintTargaHeader(&targa_header);
599 if (targa_header.attributes & 0x10)
601 printf("LoadTGA: origin must be in top left or bottom left, top right and bottom right are not supported\n");
605 /* number of attribute bits per pixel, we only support 0 or 8 */
606 alphabits = targa_header.attributes & 0x0F;
607 if (alphabits != 8 && alphabits != 0)
609 printf("LoadTGA: only 0 or 8 attribute (alpha) bits supported\n");
613 image_buffer = (unsigned char *)malloc(image_width * image_height * 4);
616 printf("LoadTGA: not enough memory for %i by %i image\n", image_width, image_height);
620 /* If bit 5 of attributes isn't set, the image has been stored from bottom to top */
621 if ((targa_header.attributes & 0x20) == 0)
623 pixbufi = (unsigned int*)image_buffer + (image_height - 1)*image_width;
624 row_inci = -image_width*2;
628 pixbufi = (unsigned int*)image_buffer;
635 if ((targa_header.image_type & ~8) == 2)
636 pix_inc = (targa_header.pixel_size + 7) / 8;
637 switch (targa_header.image_type)
639 case 1: /* colormapped, uncompressed */
640 case 3: /* greyscale, uncompressed */
641 if (fin + image_width * image_height * pix_inc > enddata)
643 for (y = 0;y < image_height;y++, pixbufi += row_inci)
644 for (x = 0;x < image_width;x++)
645 *pixbufi++ = palettei[*fin++];
648 /* BGR or BGRA, uncompressed */
649 if (fin + image_width * image_height * pix_inc > enddata)
651 if (targa_header.pixel_size == 32 && alphabits)
653 for (y = 0;y < image_height;y++)
654 memcpy(pixbufi + y * (image_width + row_inci), fin + y * image_width * pix_inc, image_width*4);
658 for (y = 0;y < image_height;y++, pixbufi += row_inci)
660 for (x = 0;x < image_width;x++, fin += pix_inc)
671 case 9: /* colormapped, RLE */
672 case 11: /* greyscale, RLE */
673 for (y = 0;y < image_height;y++, pixbufi += row_inci)
675 for (x = 0;x < image_width;)
678 break; /* error - truncated file */
682 /* RLE - all pixels the same color */
684 if (fin + pix_inc > enddata)
685 break; /* error - truncated file */
686 if (x + runlen > image_width)
687 break; /* error - line exceeds width */
688 bgra.i = palettei[*fin++];
694 /* uncompressed - all pixels different color */
696 if (fin + pix_inc * runlen > enddata)
697 break; /* error - truncated file */
698 if (x + runlen > image_width)
699 break; /* error - line exceeds width */
701 *pixbufi++ = palettei[*fin++];
705 if (x != image_width)
707 /* pixbufi is useless now */
708 printf("LoadTGA: corrupt file\n");
714 /* BGR or BGRA, RLE */
715 if (targa_header.pixel_size == 32 && alphabits)
717 for (y = 0;y < image_height;y++, pixbufi += row_inci)
719 for (x = 0;x < image_width;)
722 break; /* error - truncated file */
726 /* RLE - all pixels the same color */
728 if (fin + pix_inc > enddata)
729 break; /* error - truncated file */
730 if (x + runlen > image_width)
731 break; /* error - line exceeds width */
742 /* uncompressed - all pixels different color */
744 if (fin + pix_inc * runlen > enddata)
745 break; /* error - truncated file */
746 if (x + runlen > image_width)
747 break; /* error - line exceeds width */
760 if (x != image_width)
762 /* pixbufi is useless now */
763 printf("LoadTGA: corrupt file\n");
770 for (y = 0;y < image_height;y++, pixbufi += row_inci)
772 for (x = 0;x < image_width;)
775 break; /* error - truncated file */
779 /* RLE - all pixels the same color */
781 if (fin + pix_inc > enddata)
782 break; /* error - truncated file */
783 if (x + runlen > image_width)
784 break; /* error - line exceeds width */
795 /* uncompressed - all pixels different color */
797 if (fin + pix_inc * runlen > enddata)
798 break; /* error - truncated file */
799 if (x + runlen > image_width)
800 break; /* error - line exceeds width */
813 if (x != image_width)
815 /* pixbufi is useless now */
816 printf("LoadTGA: corrupt file\n");
823 /* unknown image_type */
830 int Image_WriteTGABGRA (const char *filename, int width, int height, const unsigned char *data)
833 unsigned char *buffer, *out;
834 const unsigned char *in, *end;
837 buffer = (unsigned char *)malloc(width*height*4 + 18);
839 memset (buffer, 0, 18);
840 buffer[2] = 2; /* uncompressed type */
841 buffer[12] = (width >> 0) & 0xFF;
842 buffer[13] = (width >> 8) & 0xFF;
843 buffer[14] = (height >> 0) & 0xFF;
844 buffer[15] = (height >> 8) & 0xFF;
846 for (y = 3;y < width*height*4;y += 4)
850 if (y < width*height*4)
852 /* save the alpha channel */
853 buffer[16] = 32; /* pixel size */
854 buffer[17] = 8; /* 8 bits of alpha */
856 /* flip upside down */
858 for (y = height - 1;y >= 0;y--)
860 memcpy(out, data + y * width * 4, width * 4);
866 /* save only the color channels */
867 buffer[16] = 24; /* pixel size */
868 buffer[17] = 0; /* 8 bits of alpha */
870 /* truncate bgra to bgr and flip upside down */
872 for (y = height - 1;y >= 0;y--)
874 in = data + y * width * 4;
875 end = in + width * 4;
876 for (;in < end;in += 4)
884 ret = FS_WriteFile (filename, buffer, out - buffer);
890 /* START stuff that originates from image.c in DarkPlaces */
892 int usage(const char *me)
894 printf("Usage: %s <infile_norm.tga> <outfile_normandheight.tga> [<scale> [<offset> [<infile_ref.tga>]]] (get heightmap from normalmap)\n", me);
895 printf("or: %s <infile_height.tga> <outfile_normandheight.tga> -1 [<scale>] (read from B, Diff)\n", me);
896 printf("or: %s <infile_height.tga> <outfile_normandheight.tga> -2 [<scale>] (read from G, Diff)\n", me);
897 printf("or: %s <infile_height.tga> <outfile_normandheight.tga> -3 [<scale>] (read from R, Diff)\n", me);
898 printf("or: %s <infile_height.tga> <outfile_normandheight.tga> -4 [<scale>] (read from A, Diff)\n", me);
899 printf("or: %s <infile_height.tga> <outfile_normandheight.tga> -5 [<scale>] (read from (R+G+B)/3, Diff)\n", me);
900 printf("or: %s <infile_height.tga> <outfile_normandheight.tga> -6 [<scale>] (read from Y, Diff)\n", me);
901 printf("or: %s <infile_height.tga> <outfile_normandheight.tga> -7 [<scale>] (read from B, FFT)\n", me);
902 printf("or: %s <infile_height.tga> <outfile_normandheight.tga> -8 [<scale>] (read from G, FFT)\n", me);
903 printf("or: %s <infile_height.tga> <outfile_normandheight.tga> -9 [<scale>] (read from R, FFT)\n", me);
904 printf("or: %s <infile_height.tga> <outfile_normandheight.tga> -10 [<scale>] (read from A, FFT)\n", me);
905 printf("or: %s <infile_height.tga> <outfile_normandheight.tga> -11 [<scale>] (read from (R+G+B)/3, FFT)\n", me);
906 printf("or: %s <infile_height.tga> <outfile_normandheight.tga> -12 [<scale>] (read from Y, FFT)\n", me);
910 int main(int argc, char **argv)
912 const char *infile, *outfile, *reffile;
913 double scale, offset;
915 unsigned char *nmapdata, *nmap, *refmap;
928 scale = atof(argv[3]);
933 offset = atof(argv[4]);
935 offset = (scale<0) ? 1 : 0;
942 nmapdata = FS_LoadFile(infile, &nmaplen);
945 printf("FS_LoadFile failed\n");
948 nmap = LoadTGA_BGRA(nmapdata, nmaplen);
952 printf("LoadTGA_BGRA failed\n");
960 nmapdata = FS_LoadFile(reffile, &nmaplen);
963 printf("FS_LoadFile failed\n");
966 refmap = LoadTGA_BGRA(nmapdata, nmaplen);
970 printf("LoadTGA_BGRA failed\n");
973 if(image_width != w || image_height != h)
975 printf("reference map must have same size as input normalmap\n");
983 hmap_to_nmap(nmap, image_width, image_height, -scale-7, offset);
985 hmap_to_nmap_local(nmap, image_width, image_height, -scale-1, offset);
987 nmap_to_hmap(nmap, refmap, image_width, image_height, scale, offset);
988 if(!Image_WriteTGABGRA(outfile, image_width, image_height, nmap))
990 printf("Image_WriteTGABGRA failed\n");