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, const double *filter, int filterw, int filterh)
50 fftw_complex *imgspace1 = fftw_malloc(w*h * sizeof(fftw_complex));
51 fftw_complex *imgspace2 = fftw_malloc(w*h * sizeof(fftw_complex));
52 fftw_complex *freqspace1 = fftw_malloc(w*h * sizeof(fftw_complex));
53 fftw_complex *freqspace2 = fftw_malloc(w*h * sizeof(fftw_complex));
54 fftw_plan i12f1 = fftw_plan_dft_2d(h, w, imgspace1, freqspace1, FFTW_FORWARD, FFTW_ESTIMATE);
55 fftw_plan i22f2 = fftw_plan_dft_2d(h, w, imgspace2, freqspace2, FFTW_FORWARD, FFTW_ESTIMATE);
56 fftw_plan f12i1 = fftw_plan_dft_2d(h, w, freqspace1, imgspace1, FFTW_BACKWARD, FFTW_ESTIMATE);
58 for(y = 0; y < h; ++y)
59 for(x = 0; x < w; ++x)
62 * unnormalized normals:
66 * BUT: darkplaces uses inverted normals, n_y actually is dh/dy by image pixel coordinates
68 nx = ((int)map[(w*y+x)*4+2] - 127.5) / 128;
69 ny = ((int)map[(w*y+x)*4+1] - 127.5) / 128;
70 nz = ((int)map[(w*y+x)*4+0] - 127.5) / 128;
72 /* reconstruct the derivatives from here */
74 imgspace1[(w*y+x)] = nx / nz * w; /* = dz/dx */
75 imgspace2[(w*y+x)] = -ny / nz * h; /* = dz/dy */
77 imgspace1[(w*y+x)][0] = nx / nz; /* = dz/dx */
78 imgspace1[(w*y+x)][1] = 0;
79 imgspace2[(w*y+x)][0] = -ny / nz; /* = dz/dy */
80 imgspace2[(w*y+x)][1] = 0;
84 /* see http://www.gamedev.net/community/forums/topic.asp?topic_id=561430 */
89 for(y = 0; y < h; ++y)
90 for(x = 0; x < w; ++x)
97 // we must invert whatever "filter" would do on (x, y)!
99 fftw_complex response_x = 0;
100 fftw_complex response_y = 0;
102 for(i = -filterh / 2; i <= filterh / 2; ++i)
103 for(j = -filterw / 2; j <= filterw / 2; ++j)
105 response_x += filter[(i + filterh / 2) * filterw + j + filterw / 2] * cexp(-_Complex_I * TWO_PI * (j * fx + i * fy));
106 response_y += filter[(i + filterh / 2) * filterw + j + filterw / 2] * cexp(-_Complex_I * TWO_PI * (i * fx + j * fy));
110 // fourier(df/dx)_xy = fourier(f)_xy * response_x
111 // fourier(df/dy)_xy = fourier(f)_xy * response_y
112 // mult by conjugate of response_x, response_y:
113 // conj(response_x) * fourier(df/dx)_xy = fourier(f)_xy * |response_x^2|
114 // conj(response_y) * fourier(df/dy)_xy = fourier(f)_xy * |response_y^2|
116 // fourier(f)_xy = (conj(response_x) * fourier(df/dx)_xy + conj(response_y) * fourier(df/dy)_xy) / (|response_x|^2 + |response_y|^2)
118 sum = cabs(response_x) * cabs(response_x) + cabs(response_y) * cabs(response_y);
121 freqspace1[(w*y+x)] = (conj(response_x) * freqspace1[(w*y+x)] + conj(response_y) * freqspace2[(w*y+x)]) / sum;
123 freqspace1[(w*y+x)] = 0;
125 // not yet implemented
130 // continuous integration case
135 /* these must have the same sign as fx and fy (so ffx*fx + ffy*fy is nonzero), otherwise do not matter */
136 /* it basically decides how artifacts are distributed */
141 freqspace1[(w*y+x)] = _Complex_I * (ffx * freqspace1[(w*y+x)] + ffy * freqspace2[(w*y+x)]) / (ffx*fx + ffy*fy) / TWO_PI;
143 freqspace1[(w*y+x)] = 0;
147 save = freqspace1[(w*y+x)][0];
148 freqspace1[(w*y+x)][0] = -(ffx * freqspace1[(w*y+x)][1] + ffy * freqspace2[(w*y+x)][1]) / (ffx*fx + ffy*fy) / TWO_PI;
149 freqspace1[(w*y+x)][1] = (ffx * save + ffy * freqspace2[(w*y+x)][0]) / (ffx*fx + ffy*fy) / TWO_PI;
153 freqspace1[(w*y+x)][0] = 0;
154 freqspace1[(w*y+x)][1] = 0;
162 /* renormalize, find min/max */
164 for(y = 0; y < h; ++y)
165 for(x = 0; x < w; ++x)
168 v = creal(imgspace1[(w*y+x)] /= pow(w*h, 1.5));
170 v = (imgspace1[(w*y+x)][0] /= pow(w*h, 1.5));
171 imgspace1[(w*y+x)][1] /= pow(w*h, 1.5);
173 if(v < vmin || (x == 0 && y == 0))
175 if(v > vmax || (x == 0 && y == 0))
183 double sa, sfa, sffa, sfva, sva;
185 sa = sfa = sffa = sfva = sva = 0;
188 for(y = 0; y < h; ++y)
189 for(x = 0; x < w; ++x)
191 a = (int)refmap[(w*y+x)*4+3];
192 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);
193 v = (v - 128.0) / 127.0;
195 f = creal(imgspace1[(w*y+x)]);
197 f = imgspace1[(w*y+x)][0];
213 /* linear regression ftw */
214 o = (sfa*sfva - sffa*sva) / (sfa*sfa-sa*sffa);
215 s = (sfa*sva - sa*sfva) / (sfa*sfa-sa*sffa);
217 else /* all values of v are equal, so we cannot get scale; we can still get offset */
219 o = ((sva - sfa) / sa);
224 * now apply user-given offset and scale to these values
225 * (x * s + o) * scale + offset
226 * x * s * scale + o * scale + offset
237 scale = 2 / (vmax - vmin);
238 offset = -(vmax + vmin) / (vmax - vmin);
241 printf("Min: %f\nAvg: %f\nMax: %f\nScale: %f\nOffset: %f\nScaled-Min: %f\nScaled-Avg: %f\nScaled-Max: %f\n",
242 vmin, 0.0, vmax, scale, offset, vmin * scale + offset, offset, vmax * scale + offset);
244 for(y = 0; y < h; ++y)
245 for(x = 0; x < w; ++x)
248 v = creal(imgspace1[(w*y+x)]);
250 v = imgspace1[(w*y+x)][0];
252 v = v * scale + offset;
257 map[(w*y+x)*4+3] = floor(128.5 + 127 * v);
260 fftw_destroy_plan(i12f1);
261 fftw_destroy_plan(i22f2);
262 fftw_destroy_plan(f12i1);
264 fftw_free(freqspace2);
265 fftw_free(freqspace1);
266 fftw_free(imgspace2);
267 fftw_free(imgspace1);
270 void hmap_to_nmap(unsigned char *map, int w, int h, int src_chan, double scale)
280 fftw_complex *imgspace1 = fftw_malloc(w*h * sizeof(fftw_complex));
281 fftw_complex *imgspace2 = fftw_malloc(w*h * sizeof(fftw_complex));
282 fftw_complex *freqspace1 = fftw_malloc(w*h * sizeof(fftw_complex));
283 fftw_complex *freqspace2 = fftw_malloc(w*h * sizeof(fftw_complex));
284 fftw_plan i12f1 = fftw_plan_dft_2d(h, w, imgspace1, freqspace1, FFTW_FORWARD, FFTW_ESTIMATE);
285 fftw_plan f12i1 = fftw_plan_dft_2d(h, w, freqspace1, imgspace1, FFTW_BACKWARD, FFTW_ESTIMATE);
286 fftw_plan f22i2 = fftw_plan_dft_2d(h, w, freqspace2, imgspace2, FFTW_BACKWARD, FFTW_ESTIMATE);
288 for(y = 0; y < h; ++y)
289 for(x = 0; x < w; ++x)
297 v = map[(w*y+x)*4+src_chan];
300 v = (map[(w*y+x)*4+0] + map[(w*y+x)*4+1] + map[(w*y+x)*4+2]) / 3;
304 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);
308 imgspace1[(w*y+x)] = (v - 128.0) / 127.0;
310 imgspace1[(w*y+x)][0] = (v - 128.0) / 127.0;
311 imgspace1[(w*y+x)][1] = 0;
314 v = 1; /* do not write alpha zero */
315 map[(w*y+x)*4+3] = floor(v + 0.5);
318 /* see http://www.gamedev.net/community/forums/topic.asp?topic_id=561430 */
322 for(y = 0; y < h; ++y)
323 for(x = 0; x < w; ++x)
332 fx = sin(fx * TWO_PI / w);
333 fy = sin(fy * TWO_PI / h);
336 /* a lowpass to prevent the worst */
337 freqspace1[(w*y+x)] *= 1 - pow(abs(fx) / (double)(w/2), 1);
338 freqspace1[(w*y+x)] *= 1 - pow(abs(fy) / (double)(h/2), 1);
340 /* a lowpass to prevent the worst */
341 freqspace1[(w*y+x)][0] *= 1 - pow(abs(fx) / (double)(w/2), 1);
342 freqspace1[(w*y+x)][1] *= 1 - pow(abs(fx) / (double)(w/2), 1);
343 freqspace1[(w*y+x)][0] *= 1 - pow(abs(fy) / (double)(h/2), 1);
344 freqspace1[(w*y+x)][1] *= 1 - pow(abs(fy) / (double)(h/2), 1);
348 freqspace2[(w*y+x)] = TWO_PI*_Complex_I * fy * freqspace1[(w*y+x)]; /* y derivative */
349 freqspace1[(w*y+x)] = TWO_PI*_Complex_I * fx * freqspace1[(w*y+x)]; /* x derivative */
351 freqspace2[(w*y+x)][0] = -TWO_PI * fy * freqspace1[(w*y+x)][1]; /* y derivative */
352 freqspace2[(w*y+x)][1] = TWO_PI * fy * freqspace1[(w*y+x)][0];
353 save = freqspace1[(w*y+x)][0];
354 freqspace1[(w*y+x)][0] = -TWO_PI * fx * freqspace1[(w*y+x)][1]; /* x derivative */
355 freqspace1[(w*y+x)][1] = TWO_PI * fx * save;
364 for(y = 0; y < h; ++y)
365 for(x = 0; x < w; ++x)
368 nx = creal(imgspace1[(w*y+x)]);
369 ny = creal(imgspace2[(w*y+x)]);
371 nx = imgspace1[(w*y+x)][0];
372 ny = imgspace2[(w*y+x)][0];
377 v = -sqrt(nx*nx + ny*ny + nz*nz);
381 ny = -ny; /* DP inverted normals */
382 map[(w*y+x)*4+2] = floor(128 + 127.5 * nx);
383 map[(w*y+x)*4+1] = floor(128 + 127.5 * ny);
384 map[(w*y+x)*4+0] = floor(128 + 127.5 * nz);
387 fftw_destroy_plan(i12f1);
388 fftw_destroy_plan(f12i1);
389 fftw_destroy_plan(f22i2);
391 fftw_free(freqspace2);
392 fftw_free(freqspace1);
393 fftw_free(imgspace2);
394 fftw_free(imgspace1);
397 void hmap_to_nmap_local(unsigned char *map, int w, int h, int src_chan, double scale, const double *filter, int filterw, int filterh)
403 double *img_reduced = malloc(w*h * sizeof(double));
405 for(y = 0; y < h; ++y)
406 for(x = 0; x < w; ++x)
414 v = map[(w*y+x)*4+src_chan];
417 v = (map[(w*y+x)*4+0] + map[(w*y+x)*4+1] + map[(w*y+x)*4+2]) / 3;
421 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);
424 img_reduced[(w*y+x)] = (v - 128.0) / 127.0;
426 v = 1; /* do not write alpha zero */
427 map[(w*y+x)*4+3] = floor(v + 0.5);
430 for(y = 0; y < h; ++y)
431 for(x = 0; x < w; ++x)
436 for(i = -filterh / 2; i <= filterh / 2; ++i)
437 for(j = -filterw / 2; j <= filterw / 2; ++j)
439 nx += img_reduced[w*((y+i+h)%h)+(x+j+w)%w] * filter[(i + filterh / 2) * filterw + j + filterw / 2];
440 ny += img_reduced[w*((y+j+h)%h)+(x+i+w)%w] * filter[(i + filterh / 2) * filterw + j + filterw / 2];
443 v = -sqrt(nx*nx + ny*ny + nz*nz);
447 ny = -ny; /* DP inverted normals */
448 map[(w*y+x)*4+2] = floor(128 + 127.5 * nx);
449 map[(w*y+x)*4+1] = floor(128 + 127.5 * ny);
450 map[(w*y+x)*4+0] = floor(128 + 127.5 * nz);
456 unsigned char *FS_LoadFile(const char *fn, int *len)
458 unsigned char *buf = NULL;
460 FILE *f = fopen(fn, "rb");
466 buf = realloc(buf, *len + 65536);
474 n = fread(buf + *len, 1, 65536, f);
489 int FS_WriteFile(const char *fn, unsigned char *data, int len)
491 FILE *f = fopen(fn, "wb");
494 if(fwrite(data, len, 1, f) != 1)
504 /* START stuff that originates from image.c in DarkPlaces */
505 int image_width, image_height;
507 typedef struct _TargaHeader
509 unsigned char id_length, colormap_type, image_type;
510 unsigned short colormap_index, colormap_length;
511 unsigned char colormap_size;
512 unsigned short x_origin, y_origin, width, height;
513 unsigned char pixel_size, attributes;
517 void PrintTargaHeader(TargaHeader *t)
519 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);
522 unsigned char *LoadTGA_BGRA (const unsigned char *f, int filesize)
524 int x, y, pix_inc, row_inci, runlen, alphabits;
525 unsigned char *image_buffer;
526 unsigned int *pixbufi;
527 const unsigned char *fin, *enddata;
528 TargaHeader targa_header;
529 unsigned int palettei[256];
540 enddata = f + filesize;
542 targa_header.id_length = f[0];
543 targa_header.colormap_type = f[1];
544 targa_header.image_type = f[2];
546 targa_header.colormap_index = f[3] + f[4] * 256;
547 targa_header.colormap_length = f[5] + f[6] * 256;
548 targa_header.colormap_size = f[7];
549 targa_header.x_origin = f[8] + f[9] * 256;
550 targa_header.y_origin = f[10] + f[11] * 256;
551 targa_header.width = image_width = f[12] + f[13] * 256;
552 targa_header.height = image_height = f[14] + f[15] * 256;
553 targa_header.pixel_size = f[16];
554 targa_header.attributes = f[17];
556 if (image_width > 32768 || image_height > 32768 || image_width <= 0 || image_height <= 0)
558 printf("LoadTGA: invalid size\n");
559 PrintTargaHeader(&targa_header);
563 /* advance to end of header */
566 /* skip TARGA image comment (usually 0 bytes) */
567 fin += targa_header.id_length;
569 /* read/skip the colormap if present (note: according to the TARGA spec it */
570 /* can be present even on 1color or greyscale images, just not used by */
571 /* the image data) */
572 if (targa_header.colormap_type)
574 if (targa_header.colormap_length > 256)
576 printf("LoadTGA: only up to 256 colormap_length supported\n");
577 PrintTargaHeader(&targa_header);
580 if (targa_header.colormap_index)
582 printf("LoadTGA: colormap_index not supported\n");
583 PrintTargaHeader(&targa_header);
586 if (targa_header.colormap_size == 24)
588 for (x = 0;x < targa_header.colormap_length;x++)
594 palettei[x] = bgra.i;
597 else if (targa_header.colormap_size == 32)
599 memcpy(palettei, fin, targa_header.colormap_length*4);
600 fin += targa_header.colormap_length * 4;
604 printf("LoadTGA: Only 32 and 24 bit colormap_size supported\n");
605 PrintTargaHeader(&targa_header);
610 /* check our pixel_size restrictions according to image_type */
611 switch (targa_header.image_type & ~8)
614 if (targa_header.pixel_size != 24 && targa_header.pixel_size != 32)
616 printf("LoadTGA: only 24bit and 32bit pixel sizes supported for type 2 and type 10 images\n");
617 PrintTargaHeader(&targa_header);
622 /* set up a palette to make the loader easier */
623 for (x = 0;x < 256;x++)
625 bgra.b[0] = bgra.b[1] = bgra.b[2] = x;
627 palettei[x] = bgra.i;
629 /* fall through to colormap case */
631 if (targa_header.pixel_size != 8)
633 printf("LoadTGA: only 8bit pixel size for type 1, 3, 9, and 11 images supported\n");
634 PrintTargaHeader(&targa_header);
639 printf("LoadTGA: Only type 1, 2, 3, 9, 10, and 11 targa RGB images supported, image_type = %i\n", targa_header.image_type);
640 PrintTargaHeader(&targa_header);
644 if (targa_header.attributes & 0x10)
646 printf("LoadTGA: origin must be in top left or bottom left, top right and bottom right are not supported\n");
650 /* number of attribute bits per pixel, we only support 0 or 8 */
651 alphabits = targa_header.attributes & 0x0F;
652 if (alphabits != 8 && alphabits != 0)
654 printf("LoadTGA: only 0 or 8 attribute (alpha) bits supported\n");
658 image_buffer = (unsigned char *)malloc(image_width * image_height * 4);
661 printf("LoadTGA: not enough memory for %i by %i image\n", image_width, image_height);
665 /* If bit 5 of attributes isn't set, the image has been stored from bottom to top */
666 if ((targa_header.attributes & 0x20) == 0)
668 pixbufi = (unsigned int*)image_buffer + (image_height - 1)*image_width;
669 row_inci = -image_width*2;
673 pixbufi = (unsigned int*)image_buffer;
680 if ((targa_header.image_type & ~8) == 2)
681 pix_inc = (targa_header.pixel_size + 7) / 8;
682 switch (targa_header.image_type)
684 case 1: /* colormapped, uncompressed */
685 case 3: /* greyscale, uncompressed */
686 if (fin + image_width * image_height * pix_inc > enddata)
688 for (y = 0;y < image_height;y++, pixbufi += row_inci)
689 for (x = 0;x < image_width;x++)
690 *pixbufi++ = palettei[*fin++];
693 /* BGR or BGRA, uncompressed */
694 if (fin + image_width * image_height * pix_inc > enddata)
696 if (targa_header.pixel_size == 32 && alphabits)
698 for (y = 0;y < image_height;y++)
699 memcpy(pixbufi + y * (image_width + row_inci), fin + y * image_width * pix_inc, image_width*4);
703 for (y = 0;y < image_height;y++, pixbufi += row_inci)
705 for (x = 0;x < image_width;x++, fin += pix_inc)
716 case 9: /* colormapped, RLE */
717 case 11: /* greyscale, RLE */
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 */
733 bgra.i = palettei[*fin++];
739 /* uncompressed - all pixels different color */
741 if (fin + pix_inc * runlen > enddata)
742 break; /* error - truncated file */
743 if (x + runlen > image_width)
744 break; /* error - line exceeds width */
746 *pixbufi++ = palettei[*fin++];
750 if (x != image_width)
752 /* pixbufi is useless now */
753 printf("LoadTGA: corrupt file\n");
759 /* BGR or BGRA, RLE */
760 if (targa_header.pixel_size == 32 && alphabits)
762 for (y = 0;y < image_height;y++, pixbufi += row_inci)
764 for (x = 0;x < image_width;)
767 break; /* error - truncated file */
771 /* RLE - all pixels the same color */
773 if (fin + pix_inc > enddata)
774 break; /* error - truncated file */
775 if (x + runlen > image_width)
776 break; /* error - line exceeds width */
787 /* uncompressed - all pixels different color */
789 if (fin + pix_inc * runlen > enddata)
790 break; /* error - truncated file */
791 if (x + runlen > image_width)
792 break; /* error - line exceeds width */
805 if (x != image_width)
807 /* pixbufi is useless now */
808 printf("LoadTGA: corrupt file\n");
815 for (y = 0;y < image_height;y++, pixbufi += row_inci)
817 for (x = 0;x < image_width;)
820 break; /* error - truncated file */
824 /* RLE - all pixels the same color */
826 if (fin + pix_inc > enddata)
827 break; /* error - truncated file */
828 if (x + runlen > image_width)
829 break; /* error - line exceeds width */
840 /* uncompressed - all pixels different color */
842 if (fin + pix_inc * runlen > enddata)
843 break; /* error - truncated file */
844 if (x + runlen > image_width)
845 break; /* error - line exceeds width */
858 if (x != image_width)
860 /* pixbufi is useless now */
861 printf("LoadTGA: corrupt file\n");
868 /* unknown image_type */
875 int Image_WriteTGABGRA (const char *filename, int width, int height, const unsigned char *data)
878 unsigned char *buffer, *out;
879 const unsigned char *in, *end;
882 buffer = (unsigned char *)malloc(width*height*4 + 18);
884 memset (buffer, 0, 18);
885 buffer[2] = 2; /* uncompressed type */
886 buffer[12] = (width >> 0) & 0xFF;
887 buffer[13] = (width >> 8) & 0xFF;
888 buffer[14] = (height >> 0) & 0xFF;
889 buffer[15] = (height >> 8) & 0xFF;
891 for (y = 3;y < width*height*4;y += 4)
895 if (y < width*height*4)
897 /* save the alpha channel */
898 buffer[16] = 32; /* pixel size */
899 buffer[17] = 8; /* 8 bits of alpha */
901 /* flip upside down */
903 for (y = height - 1;y >= 0;y--)
905 memcpy(out, data + y * width * 4, width * 4);
911 /* save only the color channels */
912 buffer[16] = 24; /* pixel size */
913 buffer[17] = 0; /* 8 bits of alpha */
915 /* truncate bgra to bgr and flip upside down */
917 for (y = height - 1;y >= 0;y--)
919 in = data + y * width * 4;
920 end = in + width * 4;
921 for (;in < end;in += 4)
929 ret = FS_WriteFile (filename, buffer, out - buffer);
935 /* START stuff that originates from image.c in DarkPlaces */
937 int usage(const char *me)
939 printf("Usage: %s <infile_norm.tga> <outfile_normandheight.tga> filtertype [<scale> [<offset> [<infile_ref.tga>]]] (get heightmap from normalmap)\n", me);
940 printf("or: %s <infile_height.tga> <outfile_normandheight.tga> filtertype -1 [<scale>] (read from B)\n", me);
941 printf("or: %s <infile_height.tga> <outfile_normandheight.tga> filtertype -2 [<scale>] (read from G)\n", me);
942 printf("or: %s <infile_height.tga> <outfile_normandheight.tga> filtertype -3 [<scale>] (read from R)\n", me);
943 printf("or: %s <infile_height.tga> <outfile_normandheight.tga> filtertype -4 [<scale>] (read from A)\n", me);
944 printf("or: %s <infile_height.tga> <outfile_normandheight.tga> filtertype -5 [<scale>] (read from (R+G+B)/3)\n", me);
945 printf("or: %s <infile_height.tga> <outfile_normandheight.tga> filtertype -6 [<scale>] (read from Y)\n", me);
949 static const double filter_scharr3[3][3] = {
950 { -3/32.0, 0, 3/32.0 },
951 { -10/32.0, 0, 10/32.0 },
952 { -3/32.0, 0, 3/32.0 }
955 static const double filter_prewitt3[3][3] = {
956 { -1/6.0, 0, 1/6.0 },
957 { -1/6.0, 0, 1/6.0 },
961 // pathologic for inverting
962 static const double filter_sobel3[3][3] = {
963 { -1/8.0, 0, 1/8.0 },
964 { -2/8.0, 0, 2/8.0 },
968 // pathologic for inverting
969 static const double filter_sobel5[5][5] = {
970 { -1/128.0, -2/128.0, 0, 2/128.0, 1/128.0 },
971 { -4/128.0, -8/128.0, 0, 8/128.0, 4/128.0 },
972 { -6/128.0, -12/128.0, 0, 12/128.0, 6/128.0 },
973 { -4/128.0, -8/128.0, 0, 8/128.0, 4/128.0 },
974 { -1/128.0, -2/128.0, 0, 2/128.0, 1/128.0 }
977 // pathologic for inverting
978 static const double filter_prewitt5[5][5] = {
979 { -1/40.0, -2/40.0, 0, 2/40.0, 1/40.0 },
980 { -1/40.0, -2/40.0, 0, 2/40.0, 1/40.0 },
981 { -1/40.0, -2/40.0, 0, 2/40.0, 1/40.0 },
982 { -1/40.0, -2/40.0, 0, 2/40.0, 1/40.0 },
983 { -1/40.0, -2/40.0, 0, 2/40.0, 1/40.0 }
986 static const double filter_trivial[1][3] = {
990 int main(int argc, char **argv)
992 const char *infile, *outfile, *reffile;
993 double scale, offset;
995 unsigned char *nmapdata, *nmap, *refmap;
996 const char *filtertype;
997 const double *filter = NULL;
998 int filterw = 0, filterh = 0;
999 #define USE_FILTER(f) \
1002 filterw = sizeof(*(f)) / sizeof(**(f)); \
1003 filterh = sizeof((f)) / sizeof(*(f)); \
1004 filter = &(f)[0][0]; \
1011 return usage(*argv);
1016 return usage(*argv);
1019 filtertype = argv[3];
1021 return usage(*argv);
1024 scale = atof(argv[4]);
1029 offset = atof(argv[5]);
1031 offset = (scale<0) ? 1 : 0;
1038 nmapdata = FS_LoadFile(infile, &nmaplen);
1041 printf("FS_LoadFile failed\n");
1044 nmap = LoadTGA_BGRA(nmapdata, nmaplen);
1048 printf("LoadTGA_BGRA failed\n");
1056 nmapdata = FS_LoadFile(reffile, &nmaplen);
1059 printf("FS_LoadFile failed\n");
1062 refmap = LoadTGA_BGRA(nmapdata, nmaplen);
1066 printf("LoadTGA_BGRA failed\n");
1069 if(image_width != w || image_height != h)
1071 printf("reference map must have same size as input normalmap\n");
1078 if(!strcmp(filtertype, "trivial"))
1079 USE_FILTER(filter_trivial);
1080 if(!strcmp(filtertype, "prewitt3"))
1081 USE_FILTER(filter_prewitt3);
1082 if(!strcmp(filtertype, "scharr3"))
1083 USE_FILTER(filter_scharr3);
1084 if(!strcmp(filtertype, "sobel3"))
1085 USE_FILTER(filter_sobel3);
1086 if(!strcmp(filtertype, "prewitt5"))
1087 USE_FILTER(filter_prewitt5);
1088 if(!strcmp(filtertype, "sobel5"))
1089 USE_FILTER(filter_sobel5);
1094 hmap_to_nmap_local(nmap, image_width, image_height, -scale-1, offset, filter, filterw, filterh);
1096 hmap_to_nmap(nmap, image_width, image_height, -scale-1, offset);
1099 nmap_to_hmap(nmap, refmap, image_width, image_height, scale, offset, filter, filterw, filterh);
1101 if(!Image_WriteTGABGRA(outfile, image_width, image_height, nmap))
1103 printf("Image_WriteTGABGRA failed\n");