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 * w; /* = dz/dx */
78 imgspace1[(w*y+x)][1] = 0;
79 imgspace2[(w*y+x)][0] = -ny / nz * h; /* = 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 fftw_complex response_x = {0, 0};
126 fftw_complex response_y = {0, 0};
128 for(i = -filterh / 2; i <= filterh / 2; ++i)
129 for(j = -filterw / 2; j <= filterw / 2; ++j)
131 response_x[0] += filter[(i + filterh / 2) * filterw + j + filterw / 2] * cos(-TWO_PI * (j * fx + i * fy));
132 response_x[1] += filter[(i + filterh / 2) * filterw + j + filterw / 2] * sin(-TWO_PI * (j * fx + i * fy));
133 response_y[0] += filter[(i + filterh / 2) * filterw + j + filterw / 2] * cos(-TWO_PI * (i * fx + j * fy));
134 response_y[1] += filter[(i + filterh / 2) * filterw + j + filterw / 2] * sin(-TWO_PI * (i * fx + j * fy));
137 sum = response_x[0] * response_x[0] + response_x[1] * response_x[1]
138 + response_y[0] * response_y[0] + response_y[1] * response_y[1];
142 double s = freqspace1[(w*y+x)][0];
143 freqspace1[(w*y+x)][0] = (response_x[0] * s + response_x[1] * freqspace1[(w*y+x)][1] + response_y[0] * freqspace2[(w*y+x)][0] + response_y[1] * freqspace2[(w*y+x)][1]) / sum;
144 freqspace1[(w*y+x)][1] = (response_x[0] * freqspace1[(w*y+x)][1] - response_x[1] * s + response_y[0] * freqspace2[(w*y+x)][1] - response_y[1] * freqspace2[(w*y+x)][0]) / sum;
148 freqspace1[(w*y+x)][0] = 0;
149 freqspace1[(w*y+x)][1] = 0;
155 // continuous integration case
160 /* these must have the same sign as fx and fy (so ffx*fx + ffy*fy is nonzero), otherwise do not matter */
161 /* it basically decides how artifacts are distributed */
166 freqspace1[(w*y+x)] = _Complex_I * (ffx * freqspace1[(w*y+x)] + ffy * freqspace2[(w*y+x)]) / (ffx*fx + ffy*fy) / TWO_PI;
168 freqspace1[(w*y+x)] = 0;
172 save = freqspace1[(w*y+x)][0];
173 freqspace1[(w*y+x)][0] = -(ffx * freqspace1[(w*y+x)][1] + ffy * freqspace2[(w*y+x)][1]) / (ffx*fx + ffy*fy) / TWO_PI;
174 freqspace1[(w*y+x)][1] = (ffx * save + ffy * freqspace2[(w*y+x)][0]) / (ffx*fx + ffy*fy) / TWO_PI;
178 freqspace1[(w*y+x)][0] = 0;
179 freqspace1[(w*y+x)][1] = 0;
187 /* renormalize, find min/max */
189 for(y = 0; y < h; ++y)
190 for(x = 0; x < w; ++x)
193 v = creal(imgspace1[(w*y+x)] /= pow(w*h, 1.5));
195 v = (imgspace1[(w*y+x)][0] /= pow(w*h, 1.5));
196 // imgspace1[(w*y+x)][1] /= pow(w*h, 1.5);
197 // this value is never used
199 if(v < vmin || (x == 0 && y == 0))
201 if(v > vmax || (x == 0 && y == 0))
209 double sa, sfa, sffa, sfva, sva;
211 sa = sfa = sffa = sfva = sva = 0;
214 for(y = 0; y < h; ++y)
215 for(x = 0; x < w; ++x)
217 a = (int)refmap[(w*y+x)*4+3];
218 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);
219 v = (v - 128.0) / 127.0;
221 f = creal(imgspace1[(w*y+x)]);
223 f = imgspace1[(w*y+x)][0];
239 /* linear regression ftw */
240 o = (sfa*sfva - sffa*sva) / (sfa*sfa-sa*sffa);
241 s = (sfa*sva - sa*sfva) / (sfa*sfa-sa*sffa);
243 else /* all values of v are equal, so we cannot get scale; we can still get offset */
245 o = ((sva - sfa) / sa);
250 * now apply user-given offset and scale to these values
251 * (x * s + o) * scale + offset
252 * x * s * scale + o * scale + offset
263 scale = 2 / (vmax - vmin);
264 offset = -(vmax + vmin) / (vmax - vmin);
267 printf("Min: %f\nAvg: %f\nMax: %f\nScale: %f\nOffset: %f\nScaled-Min: %f\nScaled-Avg: %f\nScaled-Max: %f\n",
268 vmin, 0.0, vmax, scale, offset, vmin * scale + offset, offset, vmax * scale + offset);
270 for(y = 0; y < h; ++y)
271 for(x = 0; x < w; ++x)
274 v = creal(imgspace1[(w*y+x)]);
276 v = imgspace1[(w*y+x)][0];
278 v = v * scale + offset;
283 map[(w*y+x)*4+3] = floor(128.5 + 127 * v);
286 fftw_destroy_plan(i12f1);
287 fftw_destroy_plan(i22f2);
288 fftw_destroy_plan(f12i1);
290 fftw_free(freqspace2);
291 fftw_free(freqspace1);
292 fftw_free(imgspace2);
293 fftw_free(imgspace1);
296 void hmap_to_nmap(unsigned char *map, int w, int h, int src_chan, double scale)
306 fftw_complex *imgspace1 = fftw_malloc(w*h * sizeof(fftw_complex));
307 fftw_complex *imgspace2 = fftw_malloc(w*h * sizeof(fftw_complex));
308 fftw_complex *freqspace1 = fftw_malloc(w*h * sizeof(fftw_complex));
309 fftw_complex *freqspace2 = fftw_malloc(w*h * sizeof(fftw_complex));
310 fftw_plan i12f1 = fftw_plan_dft_2d(h, w, imgspace1, freqspace1, FFTW_FORWARD, FFTW_ESTIMATE);
311 fftw_plan f12i1 = fftw_plan_dft_2d(h, w, freqspace1, imgspace1, FFTW_BACKWARD, FFTW_ESTIMATE);
312 fftw_plan f22i2 = fftw_plan_dft_2d(h, w, freqspace2, imgspace2, FFTW_BACKWARD, FFTW_ESTIMATE);
314 for(y = 0; y < h; ++y)
315 for(x = 0; x < w; ++x)
323 v = map[(w*y+x)*4+src_chan];
326 v = (map[(w*y+x)*4+0] + map[(w*y+x)*4+1] + map[(w*y+x)*4+2]) / 3;
330 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);
334 imgspace1[(w*y+x)] = (v - 128.0) / 127.0;
336 imgspace1[(w*y+x)][0] = (v - 128.0) / 127.0;
337 imgspace1[(w*y+x)][1] = 0;
340 v = 1; /* do not write alpha zero */
341 map[(w*y+x)*4+3] = floor(v + 0.5);
344 /* see http://www.gamedev.net/community/forums/topic.asp?topic_id=561430 */
348 for(y = 0; y < h; ++y)
349 for(x = 0; x < w; ++x)
358 fx = sin(fx * TWO_PI / w);
359 fy = sin(fy * TWO_PI / h);
362 /* a lowpass to prevent the worst */
363 freqspace1[(w*y+x)] *= 1 - pow(abs(fx) / (double)(w/2), 1);
364 freqspace1[(w*y+x)] *= 1 - pow(abs(fy) / (double)(h/2), 1);
366 /* a lowpass to prevent the worst */
367 freqspace1[(w*y+x)][0] *= 1 - pow(abs(fx) / (double)(w/2), 1);
368 freqspace1[(w*y+x)][1] *= 1 - pow(abs(fx) / (double)(w/2), 1);
369 freqspace1[(w*y+x)][0] *= 1 - pow(abs(fy) / (double)(h/2), 1);
370 freqspace1[(w*y+x)][1] *= 1 - pow(abs(fy) / (double)(h/2), 1);
374 freqspace2[(w*y+x)] = TWO_PI*_Complex_I * fy * freqspace1[(w*y+x)]; /* y derivative */
375 freqspace1[(w*y+x)] = TWO_PI*_Complex_I * fx * freqspace1[(w*y+x)]; /* x derivative */
377 freqspace2[(w*y+x)][0] = -TWO_PI * fy * freqspace1[(w*y+x)][1]; /* y derivative */
378 freqspace2[(w*y+x)][1] = TWO_PI * fy * freqspace1[(w*y+x)][0];
379 save = freqspace1[(w*y+x)][0];
380 freqspace1[(w*y+x)][0] = -TWO_PI * fx * freqspace1[(w*y+x)][1]; /* x derivative */
381 freqspace1[(w*y+x)][1] = TWO_PI * fx * save;
390 for(y = 0; y < h; ++y)
391 for(x = 0; x < w; ++x)
394 nx = creal(imgspace1[(w*y+x)]);
395 ny = creal(imgspace2[(w*y+x)]);
397 nx = imgspace1[(w*y+x)][0];
398 ny = imgspace2[(w*y+x)][0];
403 v = -sqrt(nx*nx + ny*ny + nz*nz);
407 ny = -ny; /* DP inverted normals */
408 map[(w*y+x)*4+2] = floor(128 + 127.5 * nx);
409 map[(w*y+x)*4+1] = floor(128 + 127.5 * ny);
410 map[(w*y+x)*4+0] = floor(128 + 127.5 * nz);
413 fftw_destroy_plan(i12f1);
414 fftw_destroy_plan(f12i1);
415 fftw_destroy_plan(f22i2);
417 fftw_free(freqspace2);
418 fftw_free(freqspace1);
419 fftw_free(imgspace2);
420 fftw_free(imgspace1);
423 void hmap_to_nmap_local(unsigned char *map, int w, int h, int src_chan, double scale, const double *filter, int filterw, int filterh)
429 double *img_reduced = malloc(w*h * sizeof(double));
431 for(y = 0; y < h; ++y)
432 for(x = 0; x < w; ++x)
440 v = map[(w*y+x)*4+src_chan];
443 v = (map[(w*y+x)*4+0] + map[(w*y+x)*4+1] + map[(w*y+x)*4+2]) / 3;
447 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);
450 img_reduced[(w*y+x)] = (v - 128.0) / 127.0;
452 v = 1; /* do not write alpha zero */
453 map[(w*y+x)*4+3] = floor(v + 0.5);
456 for(y = 0; y < h; ++y)
457 for(x = 0; x < w; ++x)
462 for(i = -filterh / 2; i <= filterh / 2; ++i)
463 for(j = -filterw / 2; j <= filterw / 2; ++j)
465 nx += img_reduced[w*((y+i+h)%h)+(x+j+w)%w] * filter[(i + filterh / 2) * filterw + j + filterw / 2];
466 ny += img_reduced[w*((y+j+h)%h)+(x+i+w)%w] * filter[(i + filterh / 2) * filterw + j + filterw / 2];
469 v = -sqrt(nx*nx + ny*ny + nz*nz);
473 ny = -ny; /* DP inverted normals */
474 map[(w*y+x)*4+2] = floor(128 + 127.5 * nx);
475 map[(w*y+x)*4+1] = floor(128 + 127.5 * ny);
476 map[(w*y+x)*4+0] = floor(128 + 127.5 * nz);
482 unsigned char *FS_LoadFile(const char *fn, int *len)
484 unsigned char *buf = NULL;
486 FILE *f = fopen(fn, "rb");
492 buf = realloc(buf, *len + 65536);
500 n = fread(buf + *len, 1, 65536, f);
515 int FS_WriteFile(const char *fn, unsigned char *data, int len)
517 FILE *f = fopen(fn, "wb");
520 if(fwrite(data, len, 1, f) != 1)
530 /* START stuff that originates from image.c in DarkPlaces */
531 int image_width, image_height;
533 typedef struct _TargaHeader
535 unsigned char id_length, colormap_type, image_type;
536 unsigned short colormap_index, colormap_length;
537 unsigned char colormap_size;
538 unsigned short x_origin, y_origin, width, height;
539 unsigned char pixel_size, attributes;
543 void PrintTargaHeader(TargaHeader *t)
545 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);
548 unsigned char *LoadTGA_BGRA (const unsigned char *f, int filesize)
550 int x, y, pix_inc, row_inci, runlen, alphabits;
551 unsigned char *image_buffer;
552 unsigned int *pixbufi;
553 const unsigned char *fin, *enddata;
554 TargaHeader targa_header;
555 unsigned int palettei[256];
566 enddata = f + filesize;
568 targa_header.id_length = f[0];
569 targa_header.colormap_type = f[1];
570 targa_header.image_type = f[2];
572 targa_header.colormap_index = f[3] + f[4] * 256;
573 targa_header.colormap_length = f[5] + f[6] * 256;
574 targa_header.colormap_size = f[7];
575 targa_header.x_origin = f[8] + f[9] * 256;
576 targa_header.y_origin = f[10] + f[11] * 256;
577 targa_header.width = image_width = f[12] + f[13] * 256;
578 targa_header.height = image_height = f[14] + f[15] * 256;
579 targa_header.pixel_size = f[16];
580 targa_header.attributes = f[17];
582 if (image_width > 32768 || image_height > 32768 || image_width <= 0 || image_height <= 0)
584 printf("LoadTGA: invalid size\n");
585 PrintTargaHeader(&targa_header);
589 /* advance to end of header */
592 /* skip TARGA image comment (usually 0 bytes) */
593 fin += targa_header.id_length;
595 /* read/skip the colormap if present (note: according to the TARGA spec it */
596 /* can be present even on 1color or greyscale images, just not used by */
597 /* the image data) */
598 if (targa_header.colormap_type)
600 if (targa_header.colormap_length > 256)
602 printf("LoadTGA: only up to 256 colormap_length supported\n");
603 PrintTargaHeader(&targa_header);
606 if (targa_header.colormap_index)
608 printf("LoadTGA: colormap_index not supported\n");
609 PrintTargaHeader(&targa_header);
612 if (targa_header.colormap_size == 24)
614 for (x = 0;x < targa_header.colormap_length;x++)
620 palettei[x] = bgra.i;
623 else if (targa_header.colormap_size == 32)
625 memcpy(palettei, fin, targa_header.colormap_length*4);
626 fin += targa_header.colormap_length * 4;
630 printf("LoadTGA: Only 32 and 24 bit colormap_size supported\n");
631 PrintTargaHeader(&targa_header);
636 /* check our pixel_size restrictions according to image_type */
637 switch (targa_header.image_type & ~8)
640 if (targa_header.pixel_size != 24 && targa_header.pixel_size != 32)
642 printf("LoadTGA: only 24bit and 32bit pixel sizes supported for type 2 and type 10 images\n");
643 PrintTargaHeader(&targa_header);
648 /* set up a palette to make the loader easier */
649 for (x = 0;x < 256;x++)
651 bgra.b[0] = bgra.b[1] = bgra.b[2] = x;
653 palettei[x] = bgra.i;
655 /* fall through to colormap case */
657 if (targa_header.pixel_size != 8)
659 printf("LoadTGA: only 8bit pixel size for type 1, 3, 9, and 11 images supported\n");
660 PrintTargaHeader(&targa_header);
665 printf("LoadTGA: Only type 1, 2, 3, 9, 10, and 11 targa RGB images supported, image_type = %i\n", targa_header.image_type);
666 PrintTargaHeader(&targa_header);
670 if (targa_header.attributes & 0x10)
672 printf("LoadTGA: origin must be in top left or bottom left, top right and bottom right are not supported\n");
676 /* number of attribute bits per pixel, we only support 0 or 8 */
677 alphabits = targa_header.attributes & 0x0F;
678 if (alphabits != 8 && alphabits != 0)
680 printf("LoadTGA: only 0 or 8 attribute (alpha) bits supported\n");
684 image_buffer = (unsigned char *)malloc(image_width * image_height * 4);
687 printf("LoadTGA: not enough memory for %i by %i image\n", image_width, image_height);
691 /* If bit 5 of attributes isn't set, the image has been stored from bottom to top */
692 if ((targa_header.attributes & 0x20) == 0)
694 pixbufi = (unsigned int*)image_buffer + (image_height - 1)*image_width;
695 row_inci = -image_width*2;
699 pixbufi = (unsigned int*)image_buffer;
706 if ((targa_header.image_type & ~8) == 2)
707 pix_inc = (targa_header.pixel_size + 7) / 8;
708 switch (targa_header.image_type)
710 case 1: /* colormapped, uncompressed */
711 case 3: /* greyscale, uncompressed */
712 if (fin + image_width * image_height * pix_inc > enddata)
714 for (y = 0;y < image_height;y++, pixbufi += row_inci)
715 for (x = 0;x < image_width;x++)
716 *pixbufi++ = palettei[*fin++];
719 /* BGR or BGRA, uncompressed */
720 if (fin + image_width * image_height * pix_inc > enddata)
722 if (targa_header.pixel_size == 32 && alphabits)
724 for (y = 0;y < image_height;y++)
725 memcpy(pixbufi + y * (image_width + row_inci), fin + y * image_width * pix_inc, image_width*4);
729 for (y = 0;y < image_height;y++, pixbufi += row_inci)
731 for (x = 0;x < image_width;x++, fin += pix_inc)
742 case 9: /* colormapped, RLE */
743 case 11: /* greyscale, RLE */
744 for (y = 0;y < image_height;y++, pixbufi += row_inci)
746 for (x = 0;x < image_width;)
749 break; /* error - truncated file */
753 /* RLE - all pixels the same color */
755 if (fin + pix_inc > enddata)
756 break; /* error - truncated file */
757 if (x + runlen > image_width)
758 break; /* error - line exceeds width */
759 bgra.i = palettei[*fin++];
765 /* uncompressed - all pixels different color */
767 if (fin + pix_inc * runlen > enddata)
768 break; /* error - truncated file */
769 if (x + runlen > image_width)
770 break; /* error - line exceeds width */
772 *pixbufi++ = palettei[*fin++];
776 if (x != image_width)
778 /* pixbufi is useless now */
779 printf("LoadTGA: corrupt file\n");
785 /* BGR or BGRA, RLE */
786 if (targa_header.pixel_size == 32 && alphabits)
788 for (y = 0;y < image_height;y++, pixbufi += row_inci)
790 for (x = 0;x < image_width;)
793 break; /* error - truncated file */
797 /* RLE - all pixels the same color */
799 if (fin + pix_inc > enddata)
800 break; /* error - truncated file */
801 if (x + runlen > image_width)
802 break; /* error - line exceeds width */
813 /* uncompressed - all pixels different color */
815 if (fin + pix_inc * runlen > enddata)
816 break; /* error - truncated file */
817 if (x + runlen > image_width)
818 break; /* error - line exceeds width */
831 if (x != image_width)
833 /* pixbufi is useless now */
834 printf("LoadTGA: corrupt file\n");
841 for (y = 0;y < image_height;y++, pixbufi += row_inci)
843 for (x = 0;x < image_width;)
846 break; /* error - truncated file */
850 /* RLE - all pixels the same color */
852 if (fin + pix_inc > enddata)
853 break; /* error - truncated file */
854 if (x + runlen > image_width)
855 break; /* error - line exceeds width */
866 /* uncompressed - all pixels different color */
868 if (fin + pix_inc * runlen > enddata)
869 break; /* error - truncated file */
870 if (x + runlen > image_width)
871 break; /* error - line exceeds width */
884 if (x != image_width)
886 /* pixbufi is useless now */
887 printf("LoadTGA: corrupt file\n");
894 /* unknown image_type */
901 int Image_WriteTGABGRA (const char *filename, int width, int height, const unsigned char *data)
904 unsigned char *buffer, *out;
905 const unsigned char *in, *end;
908 buffer = (unsigned char *)malloc(width*height*4 + 18);
910 memset (buffer, 0, 18);
911 buffer[2] = 2; /* uncompressed type */
912 buffer[12] = (width >> 0) & 0xFF;
913 buffer[13] = (width >> 8) & 0xFF;
914 buffer[14] = (height >> 0) & 0xFF;
915 buffer[15] = (height >> 8) & 0xFF;
917 for (y = 3;y < width*height*4;y += 4)
921 if (y < width*height*4)
923 /* save the alpha channel */
924 buffer[16] = 32; /* pixel size */
925 buffer[17] = 8; /* 8 bits of alpha */
927 /* flip upside down */
929 for (y = height - 1;y >= 0;y--)
931 memcpy(out, data + y * width * 4, width * 4);
937 /* save only the color channels */
938 buffer[16] = 24; /* pixel size */
939 buffer[17] = 0; /* 8 bits of alpha */
941 /* truncate bgra to bgr and flip upside down */
943 for (y = height - 1;y >= 0;y--)
945 in = data + y * width * 4;
946 end = in + width * 4;
947 for (;in < end;in += 4)
955 ret = FS_WriteFile (filename, buffer, out - buffer);
961 /* START stuff that originates from image.c in DarkPlaces */
963 int usage(const char *me)
965 printf("Usage: %s <infile_norm.tga> <outfile_normandheight.tga> filtertype [<scale> [<offset> [<infile_ref.tga>]]] (get heightmap from normalmap)\n", me);
966 printf("or: %s <infile_height.tga> <outfile_normandheight.tga> filtertype -1 [<scale>] (read from B)\n", me);
967 printf("or: %s <infile_height.tga> <outfile_normandheight.tga> filtertype -2 [<scale>] (read from G)\n", me);
968 printf("or: %s <infile_height.tga> <outfile_normandheight.tga> filtertype -3 [<scale>] (read from R)\n", me);
969 printf("or: %s <infile_height.tga> <outfile_normandheight.tga> filtertype -4 [<scale>] (read from A)\n", me);
970 printf("or: %s <infile_height.tga> <outfile_normandheight.tga> filtertype -5 [<scale>] (read from (R+G+B)/3)\n", me);
971 printf("or: %s <infile_height.tga> <outfile_normandheight.tga> filtertype -6 [<scale>] (read from Y)\n", me);
975 static const double filter_scharr3[3][3] = {
976 { -3/32.0, 0, 3/32.0 },
977 { -10/32.0, 0, 10/32.0 },
978 { -3/32.0, 0, 3/32.0 }
981 static const double filter_prewitt3[3][3] = {
982 { -1/6.0, 0, 1/6.0 },
983 { -1/6.0, 0, 1/6.0 },
987 // pathologic for inverting
988 static const double filter_sobel3[3][3] = {
989 { -1/8.0, 0, 1/8.0 },
990 { -2/8.0, 0, 2/8.0 },
994 // pathologic for inverting
995 static const double filter_sobel5[5][5] = {
996 { -1/128.0, -2/128.0, 0, 2/128.0, 1/128.0 },
997 { -4/128.0, -8/128.0, 0, 8/128.0, 4/128.0 },
998 { -6/128.0, -12/128.0, 0, 12/128.0, 6/128.0 },
999 { -4/128.0, -8/128.0, 0, 8/128.0, 4/128.0 },
1000 { -1/128.0, -2/128.0, 0, 2/128.0, 1/128.0 }
1003 // pathologic for inverting
1004 static const double filter_prewitt5[5][5] = {
1005 { -1/40.0, -2/40.0, 0, 2/40.0, 1/40.0 },
1006 { -1/40.0, -2/40.0, 0, 2/40.0, 1/40.0 },
1007 { -1/40.0, -2/40.0, 0, 2/40.0, 1/40.0 },
1008 { -1/40.0, -2/40.0, 0, 2/40.0, 1/40.0 },
1009 { -1/40.0, -2/40.0, 0, 2/40.0, 1/40.0 }
1012 static const double filter_trivial[1][3] = {
1016 int main(int argc, char **argv)
1018 const char *infile, *outfile, *reffile;
1019 double scale, offset;
1021 unsigned char *nmapdata, *nmap, *refmap;
1022 const char *filtertype;
1023 const double *filter = NULL;
1024 int filterw = 0, filterh = 0;
1025 #define USE_FILTER(f) \
1028 filterw = sizeof(*(f)) / sizeof(**(f)); \
1029 filterh = sizeof((f)) / sizeof(*(f)); \
1030 filter = &(f)[0][0]; \
1037 return usage(*argv);
1042 return usage(*argv);
1045 filtertype = argv[3];
1047 return usage(*argv);
1050 scale = atof(argv[4]);
1055 offset = atof(argv[5]);
1057 offset = (scale<0) ? 1 : 0;
1064 nmapdata = FS_LoadFile(infile, &nmaplen);
1067 printf("FS_LoadFile failed\n");
1070 nmap = LoadTGA_BGRA(nmapdata, nmaplen);
1074 printf("LoadTGA_BGRA failed\n");
1082 nmapdata = FS_LoadFile(reffile, &nmaplen);
1085 printf("FS_LoadFile failed\n");
1088 refmap = LoadTGA_BGRA(nmapdata, nmaplen);
1092 printf("LoadTGA_BGRA failed\n");
1095 if(image_width != w || image_height != h)
1097 printf("reference map must have same size as input normalmap\n");
1104 if(!strcmp(filtertype, "trivial"))
1105 USE_FILTER(filter_trivial);
1106 if(!strcmp(filtertype, "prewitt3"))
1107 USE_FILTER(filter_prewitt3);
1108 if(!strcmp(filtertype, "scharr3"))
1109 USE_FILTER(filter_scharr3);
1110 if(!strcmp(filtertype, "sobel3"))
1111 USE_FILTER(filter_sobel3);
1112 if(!strcmp(filtertype, "prewitt5"))
1113 USE_FILTER(filter_prewitt5);
1114 if(!strcmp(filtertype, "sobel5"))
1115 USE_FILTER(filter_sobel5);
1120 hmap_to_nmap_local(nmap, image_width, image_height, -scale-1, offset, filter, filterw, filterh);
1122 hmap_to_nmap(nmap, image_width, image_height, -scale-1, offset);
1125 nmap_to_hmap(nmap, refmap, image_width, image_height, scale, offset, filter, filterw, filterh);
1127 if(!Image_WriteTGABGRA(outfile, image_width, image_height, nmap))
1129 printf("Image_WriteTGABGRA failed\n");