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 */
98 /* it basically decides how artifacts are distributed */
103 freqspace1[(w*y+x)] = _Complex_I * (ffx * freqspace1[(w*y+x)] + ffy * freqspace2[(w*y+x)]) / (ffx*fx + ffy*fy) / TWO_PI;
105 freqspace1[(w*y+x)] = 0;
109 save = freqspace1[(w*y+x)][0];
110 freqspace1[(w*y+x)][0] = -(ffx * freqspace1[(w*y+x)][1] + ffy * freqspace2[(w*y+x)][1]) / (ffx*fx + ffy*fy) / TWO_PI;
111 freqspace1[(w*y+x)][1] = (ffx * save + ffy * freqspace2[(w*y+x)][0]) / (ffx*fx + ffy*fy) / TWO_PI;
115 freqspace1[(w*y+x)][0] = 0;
116 freqspace1[(w*y+x)][1] = 0;
123 /* renormalize, find min/max */
125 for(y = 0; y < h; ++y)
126 for(x = 0; x < w; ++x)
129 v = creal(imgspace1[(w*y+x)] /= (w*h));
131 v = (imgspace1[(w*y+x)][0] /= (w*h));
132 imgspace1[(w*y+x)][1] /= (w*h);
134 if(v < vmin || (x == 0 && y == 0))
136 if(v > vmax || (x == 0 && y == 0))
144 double sa, sfa, sffa, sfva, sva;
146 sa = sfa = sffa = sfva = sva = 0;
149 for(y = 0; y < h; ++y)
150 for(x = 0; x < w; ++x)
152 a = (int)refmap[(w*y+x)*4+3];
153 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);
154 v = (v - 128.0) / 127.0;
156 f = creal(imgspace1[(w*y+x)]);
158 f = imgspace1[(w*y+x)][0];
174 /* linear regression ftw */
175 o = (sfa*sfva - sffa*sva) / (sfa*sfa-sa*sffa);
176 s = (sfa*sva - sa*sfva) / (sfa*sfa-sa*sffa);
178 else /* all values of v are equal, so we cannot get scale; we can still get offset */
180 o = ((sva - sfa) / sa);
185 * now apply user-given offset and scale to these values
186 * (x * s + o) * scale + offset
187 * x * s * scale + o * scale + offset
198 scale = 2 / (vmax - vmin);
199 offset = -(vmax + vmin) / (vmax - vmin);
202 printf("Min: %f\nAvg: %f\nMax: %f\nScale: %f\nOffset: %f\nScaled-Min: %f\nScaled-Avg: %f\nScaled-Max: %f\n",
203 vmin, 0.0, vmax, scale, offset, vmin * scale + offset, offset, vmax * scale + offset);
205 for(y = 0; y < h; ++y)
206 for(x = 0; x < w; ++x)
209 v = creal(imgspace1[(w*y+x)]);
211 v = imgspace1[(w*y+x)][0];
213 v = v * scale + offset;
218 map[(w*y+x)*4+3] = floor(128.5 + 127 * v);
221 fftw_destroy_plan(i12f1);
222 fftw_destroy_plan(i22f2);
223 fftw_destroy_plan(f12i1);
225 fftw_free(freqspace2);
226 fftw_free(freqspace1);
227 fftw_free(imgspace2);
228 fftw_free(imgspace1);
231 void hmap_to_nmap(unsigned char *map, int w, int h, int src_chan, double scale)
240 fftw_complex *imgspace1 = fftw_malloc(w*h * sizeof(fftw_complex));
241 fftw_complex *imgspace2 = fftw_malloc(w*h * sizeof(fftw_complex));
242 fftw_complex *freqspace1 = fftw_malloc(w*h * sizeof(fftw_complex));
243 fftw_complex *freqspace2 = fftw_malloc(w*h * sizeof(fftw_complex));
244 fftw_plan i12f1 = fftw_plan_dft_2d(h, w, imgspace1, freqspace1, FFTW_FORWARD, FFTW_ESTIMATE);
245 fftw_plan f12i1 = fftw_plan_dft_2d(h, w, freqspace1, imgspace1, FFTW_BACKWARD, FFTW_ESTIMATE);
246 fftw_plan f22i2 = fftw_plan_dft_2d(h, w, freqspace2, imgspace2, FFTW_BACKWARD, FFTW_ESTIMATE);
248 for(y = 0; y < h; ++y)
249 for(x = 0; x < w; ++x)
257 v = map[(w*y+x)*4+src_chan];
260 v = (map[(w*y+x)*4+0] + map[(w*y+x)*4+1] + map[(w*y+x)*4+2]) / 3;
264 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);
268 imgspace1[(w*y+x)] = (v - 128.0) / 127.0;
270 imgspace1[(w*y+x)][0] = (v - 128.0) / 127.0;
271 imgspace1[(w*y+x)][1] = 0;
273 map[(w*y+x)*4+3] = floor(v + 0.5);
276 /* see http://www.gamedev.net/community/forums/topic.asp?topic_id=561430 */
280 for(y = 0; y < h; ++y)
281 for(x = 0; x < w; ++x)
290 /* a lowpass to prevent the worst */
291 freqspace1[(w*y+x)] *= 1 - pow(abs(fx) / (double)(w/2), 1);
292 freqspace1[(w*y+x)] *= 1 - pow(abs(fy) / (double)(h/2), 1);
294 freqspace2[(w*y+x)] = TWO_PI*_Complex_I * fy * freqspace1[(w*y+x)]; /* y derivative */
295 freqspace1[(w*y+x)] = TWO_PI*_Complex_I * fx * freqspace1[(w*y+x)]; /* x derivative */
297 /* a lowpass to prevent the worst */
298 freqspace1[(w*y+x)][0] *= 1 - pow(abs(fx) / (double)(w/2), 1);
299 freqspace1[(w*y+x)][1] *= 1 - pow(abs(fx) / (double)(w/2), 1);
300 freqspace1[(w*y+x)][0] *= 1 - pow(abs(fy) / (double)(h/2), 1);
301 freqspace1[(w*y+x)][1] *= 1 - pow(abs(fy) / (double)(h/2), 1);
303 freqspace2[(w*y+x)][0] = -TWO_PI * fy * freqspace1[(w*y+x)][1]; /* y derivative */
304 freqspace2[(w*y+x)][1] = TWO_PI * fy * freqspace1[(w*y+x)][0];
305 save = freqspace1[(w*y+x)][0];
306 freqspace1[(w*y+x)][0] = -TWO_PI * fx * freqspace1[(w*y+x)][1]; /* x derivative */
307 freqspace1[(w*y+x)][1] = TWO_PI * fx * save;
316 for(y = 0; y < h; ++y)
317 for(x = 0; x < w; ++x)
320 nx = creal(imgspace1[(w*y+x)]);
321 ny = creal(imgspace2[(w*y+x)]);
323 nx = imgspace1[(w*y+x)][0];
324 ny = imgspace2[(w*y+x)][0];
329 v = -sqrt(nx*nx + ny*ny + nz*nz);
333 ny = -ny; /* DP inverted normals */
334 map[(w*y+x)*4+2] = floor(128 + 127.5 * nx);
335 map[(w*y+x)*4+1] = floor(128 + 127.5 * ny);
336 map[(w*y+x)*4+0] = floor(128 + 127.5 * nz);
339 fftw_destroy_plan(i12f1);
340 fftw_destroy_plan(f12i1);
341 fftw_destroy_plan(f22i2);
343 fftw_free(freqspace2);
344 fftw_free(freqspace1);
345 fftw_free(imgspace2);
346 fftw_free(imgspace1);
349 void hmap_to_nmap_local(unsigned char *map, int w, int h, int src_chan, double scale)
355 double *img_reduced = malloc(w*h * sizeof(double));
356 static const double filter[3][3] = { /* filter to derive one component */
361 static const double filter_mult = 0.125;
363 for(y = 0; y < h; ++y)
364 for(x = 0; x < w; ++x)
372 v = map[(w*y+x)*4+src_chan];
375 v = (map[(w*y+x)*4+0] + map[(w*y+x)*4+1] + map[(w*y+x)*4+2]) / 3;
379 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);
382 img_reduced[(w*y+x)] = (v - 128.0) / 127.0;
383 map[(w*y+x)*4+3] = floor(v + 0.5);
386 for(y = 0; y < h; ++y)
387 for(x = 0; x < w; ++x)
389 nz = -1 / (scale * filter_mult);
392 for(i = -(int)(sizeof(filter) / sizeof(*filter)) / 2; i <= (int)(sizeof(filter) / sizeof(*filter)) / 2; ++i)
393 for(j = -(int)(sizeof(*filter) / sizeof(**filter)) / 2; j <= (int)(sizeof(*filter) / sizeof(**filter)) / 2; ++j)
395 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];
396 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];
399 v = -sqrt(nx*nx + ny*ny + nz*nz);
403 ny = -ny; /* DP inverted normals */
404 map[(w*y+x)*4+2] = floor(128 + 127.5 * nx);
405 map[(w*y+x)*4+1] = floor(128 + 127.5 * ny);
406 map[(w*y+x)*4+0] = floor(128 + 127.5 * nz);
412 unsigned char *FS_LoadFile(const char *fn, int *len)
414 unsigned char *buf = NULL;
416 FILE *f = fopen(fn, "rb");
422 buf = realloc(buf, *len + 65536);
430 n = fread(buf + *len, 1, 65536, f);
445 int FS_WriteFile(const char *fn, unsigned char *data, int len)
447 FILE *f = fopen(fn, "wb");
450 if(fwrite(data, len, 1, f) != 1)
460 /* START stuff that originates from image.c in DarkPlaces */
461 int image_width, image_height;
463 typedef struct _TargaHeader
465 unsigned char id_length, colormap_type, image_type;
466 unsigned short colormap_index, colormap_length;
467 unsigned char colormap_size;
468 unsigned short x_origin, y_origin, width, height;
469 unsigned char pixel_size, attributes;
473 void PrintTargaHeader(TargaHeader *t)
475 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);
478 unsigned char *LoadTGA_BGRA (const unsigned char *f, int filesize)
480 int x, y, pix_inc, row_inci, runlen, alphabits;
481 unsigned char *image_buffer;
482 unsigned int *pixbufi;
483 const unsigned char *fin, *enddata;
484 TargaHeader targa_header;
485 unsigned int palettei[256];
496 enddata = f + filesize;
498 targa_header.id_length = f[0];
499 targa_header.colormap_type = f[1];
500 targa_header.image_type = f[2];
502 targa_header.colormap_index = f[3] + f[4] * 256;
503 targa_header.colormap_length = f[5] + f[6] * 256;
504 targa_header.colormap_size = f[7];
505 targa_header.x_origin = f[8] + f[9] * 256;
506 targa_header.y_origin = f[10] + f[11] * 256;
507 targa_header.width = image_width = f[12] + f[13] * 256;
508 targa_header.height = image_height = f[14] + f[15] * 256;
509 targa_header.pixel_size = f[16];
510 targa_header.attributes = f[17];
512 if (image_width > 32768 || image_height > 32768 || image_width <= 0 || image_height <= 0)
514 printf("LoadTGA: invalid size\n");
515 PrintTargaHeader(&targa_header);
519 /* advance to end of header */
522 /* skip TARGA image comment (usually 0 bytes) */
523 fin += targa_header.id_length;
525 /* read/skip the colormap if present (note: according to the TARGA spec it */
526 /* can be present even on 1color or greyscale images, just not used by */
527 /* the image data) */
528 if (targa_header.colormap_type)
530 if (targa_header.colormap_length > 256)
532 printf("LoadTGA: only up to 256 colormap_length supported\n");
533 PrintTargaHeader(&targa_header);
536 if (targa_header.colormap_index)
538 printf("LoadTGA: colormap_index not supported\n");
539 PrintTargaHeader(&targa_header);
542 if (targa_header.colormap_size == 24)
544 for (x = 0;x < targa_header.colormap_length;x++)
550 palettei[x] = bgra.i;
553 else if (targa_header.colormap_size == 32)
555 memcpy(palettei, fin, targa_header.colormap_length*4);
556 fin += targa_header.colormap_length * 4;
560 printf("LoadTGA: Only 32 and 24 bit colormap_size supported\n");
561 PrintTargaHeader(&targa_header);
566 /* check our pixel_size restrictions according to image_type */
567 switch (targa_header.image_type & ~8)
570 if (targa_header.pixel_size != 24 && targa_header.pixel_size != 32)
572 printf("LoadTGA: only 24bit and 32bit pixel sizes supported for type 2 and type 10 images\n");
573 PrintTargaHeader(&targa_header);
578 /* set up a palette to make the loader easier */
579 for (x = 0;x < 256;x++)
581 bgra.b[0] = bgra.b[1] = bgra.b[2] = x;
583 palettei[x] = bgra.i;
585 /* fall through to colormap case */
587 if (targa_header.pixel_size != 8)
589 printf("LoadTGA: only 8bit pixel size for type 1, 3, 9, and 11 images supported\n");
590 PrintTargaHeader(&targa_header);
595 printf("LoadTGA: Only type 1, 2, 3, 9, 10, and 11 targa RGB images supported, image_type = %i\n", targa_header.image_type);
596 PrintTargaHeader(&targa_header);
600 if (targa_header.attributes & 0x10)
602 printf("LoadTGA: origin must be in top left or bottom left, top right and bottom right are not supported\n");
606 /* number of attribute bits per pixel, we only support 0 or 8 */
607 alphabits = targa_header.attributes & 0x0F;
608 if (alphabits != 8 && alphabits != 0)
610 printf("LoadTGA: only 0 or 8 attribute (alpha) bits supported\n");
614 image_buffer = (unsigned char *)malloc(image_width * image_height * 4);
617 printf("LoadTGA: not enough memory for %i by %i image\n", image_width, image_height);
621 /* If bit 5 of attributes isn't set, the image has been stored from bottom to top */
622 if ((targa_header.attributes & 0x20) == 0)
624 pixbufi = (unsigned int*)image_buffer + (image_height - 1)*image_width;
625 row_inci = -image_width*2;
629 pixbufi = (unsigned int*)image_buffer;
636 if ((targa_header.image_type & ~8) == 2)
637 pix_inc = (targa_header.pixel_size + 7) / 8;
638 switch (targa_header.image_type)
640 case 1: /* colormapped, uncompressed */
641 case 3: /* greyscale, uncompressed */
642 if (fin + image_width * image_height * pix_inc > enddata)
644 for (y = 0;y < image_height;y++, pixbufi += row_inci)
645 for (x = 0;x < image_width;x++)
646 *pixbufi++ = palettei[*fin++];
649 /* BGR or BGRA, uncompressed */
650 if (fin + image_width * image_height * pix_inc > enddata)
652 if (targa_header.pixel_size == 32 && alphabits)
654 for (y = 0;y < image_height;y++)
655 memcpy(pixbufi + y * (image_width + row_inci), fin + y * image_width * pix_inc, image_width*4);
659 for (y = 0;y < image_height;y++, pixbufi += row_inci)
661 for (x = 0;x < image_width;x++, fin += pix_inc)
672 case 9: /* colormapped, RLE */
673 case 11: /* greyscale, RLE */
674 for (y = 0;y < image_height;y++, pixbufi += row_inci)
676 for (x = 0;x < image_width;)
679 break; /* error - truncated file */
683 /* RLE - all pixels the same color */
685 if (fin + pix_inc > enddata)
686 break; /* error - truncated file */
687 if (x + runlen > image_width)
688 break; /* error - line exceeds width */
689 bgra.i = palettei[*fin++];
695 /* uncompressed - all pixels different color */
697 if (fin + pix_inc * runlen > enddata)
698 break; /* error - truncated file */
699 if (x + runlen > image_width)
700 break; /* error - line exceeds width */
702 *pixbufi++ = palettei[*fin++];
706 if (x != image_width)
708 /* pixbufi is useless now */
709 printf("LoadTGA: corrupt file\n");
715 /* BGR or BGRA, RLE */
716 if (targa_header.pixel_size == 32 && alphabits)
718 for (y = 0;y < image_height;y++, pixbufi += row_inci)
720 for (x = 0;x < image_width;)
723 break; /* error - truncated file */
727 /* RLE - all pixels the same color */
729 if (fin + pix_inc > enddata)
730 break; /* error - truncated file */
731 if (x + runlen > image_width)
732 break; /* error - line exceeds width */
743 /* uncompressed - all pixels different color */
745 if (fin + pix_inc * runlen > enddata)
746 break; /* error - truncated file */
747 if (x + runlen > image_width)
748 break; /* error - line exceeds width */
761 if (x != image_width)
763 /* pixbufi is useless now */
764 printf("LoadTGA: corrupt file\n");
771 for (y = 0;y < image_height;y++, pixbufi += row_inci)
773 for (x = 0;x < image_width;)
776 break; /* error - truncated file */
780 /* RLE - all pixels the same color */
782 if (fin + pix_inc > enddata)
783 break; /* error - truncated file */
784 if (x + runlen > image_width)
785 break; /* error - line exceeds width */
796 /* uncompressed - all pixels different color */
798 if (fin + pix_inc * runlen > enddata)
799 break; /* error - truncated file */
800 if (x + runlen > image_width)
801 break; /* error - line exceeds width */
814 if (x != image_width)
816 /* pixbufi is useless now */
817 printf("LoadTGA: corrupt file\n");
824 /* unknown image_type */
831 int Image_WriteTGABGRA (const char *filename, int width, int height, const unsigned char *data)
834 unsigned char *buffer, *out;
835 const unsigned char *in, *end;
838 buffer = (unsigned char *)malloc(width*height*4 + 18);
840 memset (buffer, 0, 18);
841 buffer[2] = 2; /* uncompressed type */
842 buffer[12] = (width >> 0) & 0xFF;
843 buffer[13] = (width >> 8) & 0xFF;
844 buffer[14] = (height >> 0) & 0xFF;
845 buffer[15] = (height >> 8) & 0xFF;
847 for (y = 3;y < width*height*4;y += 4)
851 if (y < width*height*4)
853 /* save the alpha channel */
854 buffer[16] = 32; /* pixel size */
855 buffer[17] = 8; /* 8 bits of alpha */
857 /* flip upside down */
859 for (y = height - 1;y >= 0;y--)
861 memcpy(out, data + y * width * 4, width * 4);
867 /* save only the color channels */
868 buffer[16] = 24; /* pixel size */
869 buffer[17] = 0; /* 8 bits of alpha */
871 /* truncate bgra to bgr and flip upside down */
873 for (y = height - 1;y >= 0;y--)
875 in = data + y * width * 4;
876 end = in + width * 4;
877 for (;in < end;in += 4)
885 ret = FS_WriteFile (filename, buffer, out - buffer);
891 /* START stuff that originates from image.c in DarkPlaces */
893 int usage(const char *me)
895 printf("Usage: %s <infile_norm.tga> <outfile_normandheight.tga> [<scale> [<offset> [<infile_ref.tga>]]] (get heightmap from normalmap)\n", me);
896 printf("or: %s <infile_height.tga> <outfile_normandheight.tga> -1 [<scale>] (read from B, Diff)\n", me);
897 printf("or: %s <infile_height.tga> <outfile_normandheight.tga> -2 [<scale>] (read from G, Diff)\n", me);
898 printf("or: %s <infile_height.tga> <outfile_normandheight.tga> -3 [<scale>] (read from R, Diff)\n", me);
899 printf("or: %s <infile_height.tga> <outfile_normandheight.tga> -4 [<scale>] (read from A, Diff)\n", me);
900 printf("or: %s <infile_height.tga> <outfile_normandheight.tga> -5 [<scale>] (read from (R+G+B)/3, Diff)\n", me);
901 printf("or: %s <infile_height.tga> <outfile_normandheight.tga> -6 [<scale>] (read from Y, Diff)\n", me);
902 printf("or: %s <infile_height.tga> <outfile_normandheight.tga> -7 [<scale>] (read from B, FFT)\n", me);
903 printf("or: %s <infile_height.tga> <outfile_normandheight.tga> -8 [<scale>] (read from G, FFT)\n", me);
904 printf("or: %s <infile_height.tga> <outfile_normandheight.tga> -9 [<scale>] (read from R, FFT)\n", me);
905 printf("or: %s <infile_height.tga> <outfile_normandheight.tga> -10 [<scale>] (read from A, FFT)\n", me);
906 printf("or: %s <infile_height.tga> <outfile_normandheight.tga> -11 [<scale>] (read from (R+G+B)/3, FFT)\n", me);
907 printf("or: %s <infile_height.tga> <outfile_normandheight.tga> -12 [<scale>] (read from Y, FFT)\n", me);
911 int main(int argc, char **argv)
913 const char *infile, *outfile, *reffile;
914 double scale, offset;
916 unsigned char *nmapdata, *nmap, *refmap;
929 scale = atof(argv[3]);
934 offset = atof(argv[4]);
936 offset = (scale<0) ? 1 : 0;
943 nmapdata = FS_LoadFile(infile, &nmaplen);
946 printf("FS_LoadFile failed\n");
949 nmap = LoadTGA_BGRA(nmapdata, nmaplen);
953 printf("LoadTGA_BGRA failed\n");
961 nmapdata = FS_LoadFile(reffile, &nmaplen);
964 printf("FS_LoadFile failed\n");
967 refmap = LoadTGA_BGRA(nmapdata, nmaplen);
971 printf("LoadTGA_BGRA failed\n");
974 if(image_width != w || image_height != h)
976 printf("reference map must have same size as input normalmap\n");
984 hmap_to_nmap(nmap, image_width, image_height, -scale-7, offset);
986 hmap_to_nmap_local(nmap, image_width, image_height, -scale-1, offset);
988 nmap_to_hmap(nmap, refmap, image_width, image_height, scale, offset);
989 if(!Image_WriteTGABGRA(outfile, image_width, image_height, nmap))
991 printf("Image_WriteTGABGRA failed\n");