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 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 freqspace1[(w*y+x)][0] = (response_x[0] * freqspace1[(w*y+x)][0] + 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;
143 freqspace1[(w*y+x)][1] = (response_x[0] * freqspace1[(w*y+x)][1] - response_x[1] * freqspace1[(w*y+x)][0] + response_y[0] * freqspace2[(w*y+x)][1] - response_y[1] * freqspace2[(w*y+x)][0]) / sum;
147 freqspace1[(w*y+x)][0] = 0;
148 freqspace1[(w*y+x)][1] = 0;
154 // continuous integration case
159 /* these must have the same sign as fx and fy (so ffx*fx + ffy*fy is nonzero), otherwise do not matter */
160 /* it basically decides how artifacts are distributed */
165 freqspace1[(w*y+x)] = _Complex_I * (ffx * freqspace1[(w*y+x)] + ffy * freqspace2[(w*y+x)]) / (ffx*fx + ffy*fy) / TWO_PI;
167 freqspace1[(w*y+x)] = 0;
171 save = freqspace1[(w*y+x)][0];
172 freqspace1[(w*y+x)][0] = -(ffx * freqspace1[(w*y+x)][1] + ffy * freqspace2[(w*y+x)][1]) / (ffx*fx + ffy*fy) / TWO_PI;
173 freqspace1[(w*y+x)][1] = (ffx * save + ffy * freqspace2[(w*y+x)][0]) / (ffx*fx + ffy*fy) / TWO_PI;
177 freqspace1[(w*y+x)][0] = 0;
178 freqspace1[(w*y+x)][1] = 0;
186 /* renormalize, find min/max */
188 for(y = 0; y < h; ++y)
189 for(x = 0; x < w; ++x)
192 v = creal(imgspace1[(w*y+x)] /= pow(w*h, 1.5));
194 v = (imgspace1[(w*y+x)][0] /= pow(w*h, 1.5));
195 imgspace1[(w*y+x)][1] /= pow(w*h, 1.5);
197 if(v < vmin || (x == 0 && y == 0))
199 if(v > vmax || (x == 0 && y == 0))
207 double sa, sfa, sffa, sfva, sva;
209 sa = sfa = sffa = sfva = sva = 0;
212 for(y = 0; y < h; ++y)
213 for(x = 0; x < w; ++x)
215 a = (int)refmap[(w*y+x)*4+3];
216 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);
217 v = (v - 128.0) / 127.0;
219 f = creal(imgspace1[(w*y+x)]);
221 f = imgspace1[(w*y+x)][0];
237 /* linear regression ftw */
238 o = (sfa*sfva - sffa*sva) / (sfa*sfa-sa*sffa);
239 s = (sfa*sva - sa*sfva) / (sfa*sfa-sa*sffa);
241 else /* all values of v are equal, so we cannot get scale; we can still get offset */
243 o = ((sva - sfa) / sa);
248 * now apply user-given offset and scale to these values
249 * (x * s + o) * scale + offset
250 * x * s * scale + o * scale + offset
261 scale = 2 / (vmax - vmin);
262 offset = -(vmax + vmin) / (vmax - vmin);
265 printf("Min: %f\nAvg: %f\nMax: %f\nScale: %f\nOffset: %f\nScaled-Min: %f\nScaled-Avg: %f\nScaled-Max: %f\n",
266 vmin, 0.0, vmax, scale, offset, vmin * scale + offset, offset, vmax * scale + offset);
268 for(y = 0; y < h; ++y)
269 for(x = 0; x < w; ++x)
272 v = creal(imgspace1[(w*y+x)]);
274 v = imgspace1[(w*y+x)][0];
276 v = v * scale + offset;
281 map[(w*y+x)*4+3] = floor(128.5 + 127 * v);
284 fftw_destroy_plan(i12f1);
285 fftw_destroy_plan(i22f2);
286 fftw_destroy_plan(f12i1);
288 fftw_free(freqspace2);
289 fftw_free(freqspace1);
290 fftw_free(imgspace2);
291 fftw_free(imgspace1);
294 void hmap_to_nmap(unsigned char *map, int w, int h, int src_chan, double scale)
304 fftw_complex *imgspace1 = fftw_malloc(w*h * sizeof(fftw_complex));
305 fftw_complex *imgspace2 = fftw_malloc(w*h * sizeof(fftw_complex));
306 fftw_complex *freqspace1 = fftw_malloc(w*h * sizeof(fftw_complex));
307 fftw_complex *freqspace2 = fftw_malloc(w*h * sizeof(fftw_complex));
308 fftw_plan i12f1 = fftw_plan_dft_2d(h, w, imgspace1, freqspace1, FFTW_FORWARD, FFTW_ESTIMATE);
309 fftw_plan f12i1 = fftw_plan_dft_2d(h, w, freqspace1, imgspace1, FFTW_BACKWARD, FFTW_ESTIMATE);
310 fftw_plan f22i2 = fftw_plan_dft_2d(h, w, freqspace2, imgspace2, FFTW_BACKWARD, FFTW_ESTIMATE);
312 for(y = 0; y < h; ++y)
313 for(x = 0; x < w; ++x)
321 v = map[(w*y+x)*4+src_chan];
324 v = (map[(w*y+x)*4+0] + map[(w*y+x)*4+1] + map[(w*y+x)*4+2]) / 3;
328 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);
332 imgspace1[(w*y+x)] = (v - 128.0) / 127.0;
334 imgspace1[(w*y+x)][0] = (v - 128.0) / 127.0;
335 imgspace1[(w*y+x)][1] = 0;
338 v = 1; /* do not write alpha zero */
339 map[(w*y+x)*4+3] = floor(v + 0.5);
342 /* see http://www.gamedev.net/community/forums/topic.asp?topic_id=561430 */
346 for(y = 0; y < h; ++y)
347 for(x = 0; x < w; ++x)
356 fx = sin(fx * TWO_PI / w);
357 fy = sin(fy * TWO_PI / h);
360 /* a lowpass to prevent the worst */
361 freqspace1[(w*y+x)] *= 1 - pow(abs(fx) / (double)(w/2), 1);
362 freqspace1[(w*y+x)] *= 1 - pow(abs(fy) / (double)(h/2), 1);
364 /* a lowpass to prevent the worst */
365 freqspace1[(w*y+x)][0] *= 1 - pow(abs(fx) / (double)(w/2), 1);
366 freqspace1[(w*y+x)][1] *= 1 - pow(abs(fx) / (double)(w/2), 1);
367 freqspace1[(w*y+x)][0] *= 1 - pow(abs(fy) / (double)(h/2), 1);
368 freqspace1[(w*y+x)][1] *= 1 - pow(abs(fy) / (double)(h/2), 1);
372 freqspace2[(w*y+x)] = TWO_PI*_Complex_I * fy * freqspace1[(w*y+x)]; /* y derivative */
373 freqspace1[(w*y+x)] = TWO_PI*_Complex_I * fx * freqspace1[(w*y+x)]; /* x derivative */
375 freqspace2[(w*y+x)][0] = -TWO_PI * fy * freqspace1[(w*y+x)][1]; /* y derivative */
376 freqspace2[(w*y+x)][1] = TWO_PI * fy * freqspace1[(w*y+x)][0];
377 save = freqspace1[(w*y+x)][0];
378 freqspace1[(w*y+x)][0] = -TWO_PI * fx * freqspace1[(w*y+x)][1]; /* x derivative */
379 freqspace1[(w*y+x)][1] = TWO_PI * fx * save;
388 for(y = 0; y < h; ++y)
389 for(x = 0; x < w; ++x)
392 nx = creal(imgspace1[(w*y+x)]);
393 ny = creal(imgspace2[(w*y+x)]);
395 nx = imgspace1[(w*y+x)][0];
396 ny = imgspace2[(w*y+x)][0];
401 v = -sqrt(nx*nx + ny*ny + nz*nz);
405 ny = -ny; /* DP inverted normals */
406 map[(w*y+x)*4+2] = floor(128 + 127.5 * nx);
407 map[(w*y+x)*4+1] = floor(128 + 127.5 * ny);
408 map[(w*y+x)*4+0] = floor(128 + 127.5 * nz);
411 fftw_destroy_plan(i12f1);
412 fftw_destroy_plan(f12i1);
413 fftw_destroy_plan(f22i2);
415 fftw_free(freqspace2);
416 fftw_free(freqspace1);
417 fftw_free(imgspace2);
418 fftw_free(imgspace1);
421 void hmap_to_nmap_local(unsigned char *map, int w, int h, int src_chan, double scale, const double *filter, int filterw, int filterh)
427 double *img_reduced = malloc(w*h * sizeof(double));
429 for(y = 0; y < h; ++y)
430 for(x = 0; x < w; ++x)
438 v = map[(w*y+x)*4+src_chan];
441 v = (map[(w*y+x)*4+0] + map[(w*y+x)*4+1] + map[(w*y+x)*4+2]) / 3;
445 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);
448 img_reduced[(w*y+x)] = (v - 128.0) / 127.0;
450 v = 1; /* do not write alpha zero */
451 map[(w*y+x)*4+3] = floor(v + 0.5);
454 for(y = 0; y < h; ++y)
455 for(x = 0; x < w; ++x)
460 for(i = -filterh / 2; i <= filterh / 2; ++i)
461 for(j = -filterw / 2; j <= filterw / 2; ++j)
463 nx += img_reduced[w*((y+i+h)%h)+(x+j+w)%w] * filter[(i + filterh / 2) * filterw + j + filterw / 2];
464 ny += img_reduced[w*((y+j+h)%h)+(x+i+w)%w] * filter[(i + filterh / 2) * filterw + j + filterw / 2];
467 v = -sqrt(nx*nx + ny*ny + nz*nz);
471 ny = -ny; /* DP inverted normals */
472 map[(w*y+x)*4+2] = floor(128 + 127.5 * nx);
473 map[(w*y+x)*4+1] = floor(128 + 127.5 * ny);
474 map[(w*y+x)*4+0] = floor(128 + 127.5 * nz);
480 unsigned char *FS_LoadFile(const char *fn, int *len)
482 unsigned char *buf = NULL;
484 FILE *f = fopen(fn, "rb");
490 buf = realloc(buf, *len + 65536);
498 n = fread(buf + *len, 1, 65536, f);
513 int FS_WriteFile(const char *fn, unsigned char *data, int len)
515 FILE *f = fopen(fn, "wb");
518 if(fwrite(data, len, 1, f) != 1)
528 /* START stuff that originates from image.c in DarkPlaces */
529 int image_width, image_height;
531 typedef struct _TargaHeader
533 unsigned char id_length, colormap_type, image_type;
534 unsigned short colormap_index, colormap_length;
535 unsigned char colormap_size;
536 unsigned short x_origin, y_origin, width, height;
537 unsigned char pixel_size, attributes;
541 void PrintTargaHeader(TargaHeader *t)
543 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);
546 unsigned char *LoadTGA_BGRA (const unsigned char *f, int filesize)
548 int x, y, pix_inc, row_inci, runlen, alphabits;
549 unsigned char *image_buffer;
550 unsigned int *pixbufi;
551 const unsigned char *fin, *enddata;
552 TargaHeader targa_header;
553 unsigned int palettei[256];
564 enddata = f + filesize;
566 targa_header.id_length = f[0];
567 targa_header.colormap_type = f[1];
568 targa_header.image_type = f[2];
570 targa_header.colormap_index = f[3] + f[4] * 256;
571 targa_header.colormap_length = f[5] + f[6] * 256;
572 targa_header.colormap_size = f[7];
573 targa_header.x_origin = f[8] + f[9] * 256;
574 targa_header.y_origin = f[10] + f[11] * 256;
575 targa_header.width = image_width = f[12] + f[13] * 256;
576 targa_header.height = image_height = f[14] + f[15] * 256;
577 targa_header.pixel_size = f[16];
578 targa_header.attributes = f[17];
580 if (image_width > 32768 || image_height > 32768 || image_width <= 0 || image_height <= 0)
582 printf("LoadTGA: invalid size\n");
583 PrintTargaHeader(&targa_header);
587 /* advance to end of header */
590 /* skip TARGA image comment (usually 0 bytes) */
591 fin += targa_header.id_length;
593 /* read/skip the colormap if present (note: according to the TARGA spec it */
594 /* can be present even on 1color or greyscale images, just not used by */
595 /* the image data) */
596 if (targa_header.colormap_type)
598 if (targa_header.colormap_length > 256)
600 printf("LoadTGA: only up to 256 colormap_length supported\n");
601 PrintTargaHeader(&targa_header);
604 if (targa_header.colormap_index)
606 printf("LoadTGA: colormap_index not supported\n");
607 PrintTargaHeader(&targa_header);
610 if (targa_header.colormap_size == 24)
612 for (x = 0;x < targa_header.colormap_length;x++)
618 palettei[x] = bgra.i;
621 else if (targa_header.colormap_size == 32)
623 memcpy(palettei, fin, targa_header.colormap_length*4);
624 fin += targa_header.colormap_length * 4;
628 printf("LoadTGA: Only 32 and 24 bit colormap_size supported\n");
629 PrintTargaHeader(&targa_header);
634 /* check our pixel_size restrictions according to image_type */
635 switch (targa_header.image_type & ~8)
638 if (targa_header.pixel_size != 24 && targa_header.pixel_size != 32)
640 printf("LoadTGA: only 24bit and 32bit pixel sizes supported for type 2 and type 10 images\n");
641 PrintTargaHeader(&targa_header);
646 /* set up a palette to make the loader easier */
647 for (x = 0;x < 256;x++)
649 bgra.b[0] = bgra.b[1] = bgra.b[2] = x;
651 palettei[x] = bgra.i;
653 /* fall through to colormap case */
655 if (targa_header.pixel_size != 8)
657 printf("LoadTGA: only 8bit pixel size for type 1, 3, 9, and 11 images supported\n");
658 PrintTargaHeader(&targa_header);
663 printf("LoadTGA: Only type 1, 2, 3, 9, 10, and 11 targa RGB images supported, image_type = %i\n", targa_header.image_type);
664 PrintTargaHeader(&targa_header);
668 if (targa_header.attributes & 0x10)
670 printf("LoadTGA: origin must be in top left or bottom left, top right and bottom right are not supported\n");
674 /* number of attribute bits per pixel, we only support 0 or 8 */
675 alphabits = targa_header.attributes & 0x0F;
676 if (alphabits != 8 && alphabits != 0)
678 printf("LoadTGA: only 0 or 8 attribute (alpha) bits supported\n");
682 image_buffer = (unsigned char *)malloc(image_width * image_height * 4);
685 printf("LoadTGA: not enough memory for %i by %i image\n", image_width, image_height);
689 /* If bit 5 of attributes isn't set, the image has been stored from bottom to top */
690 if ((targa_header.attributes & 0x20) == 0)
692 pixbufi = (unsigned int*)image_buffer + (image_height - 1)*image_width;
693 row_inci = -image_width*2;
697 pixbufi = (unsigned int*)image_buffer;
704 if ((targa_header.image_type & ~8) == 2)
705 pix_inc = (targa_header.pixel_size + 7) / 8;
706 switch (targa_header.image_type)
708 case 1: /* colormapped, uncompressed */
709 case 3: /* greyscale, uncompressed */
710 if (fin + image_width * image_height * pix_inc > enddata)
712 for (y = 0;y < image_height;y++, pixbufi += row_inci)
713 for (x = 0;x < image_width;x++)
714 *pixbufi++ = palettei[*fin++];
717 /* BGR or BGRA, uncompressed */
718 if (fin + image_width * image_height * pix_inc > enddata)
720 if (targa_header.pixel_size == 32 && alphabits)
722 for (y = 0;y < image_height;y++)
723 memcpy(pixbufi + y * (image_width + row_inci), fin + y * image_width * pix_inc, image_width*4);
727 for (y = 0;y < image_height;y++, pixbufi += row_inci)
729 for (x = 0;x < image_width;x++, fin += pix_inc)
740 case 9: /* colormapped, RLE */
741 case 11: /* greyscale, RLE */
742 for (y = 0;y < image_height;y++, pixbufi += row_inci)
744 for (x = 0;x < image_width;)
747 break; /* error - truncated file */
751 /* RLE - all pixels the same color */
753 if (fin + pix_inc > enddata)
754 break; /* error - truncated file */
755 if (x + runlen > image_width)
756 break; /* error - line exceeds width */
757 bgra.i = palettei[*fin++];
763 /* uncompressed - all pixels different color */
765 if (fin + pix_inc * runlen > enddata)
766 break; /* error - truncated file */
767 if (x + runlen > image_width)
768 break; /* error - line exceeds width */
770 *pixbufi++ = palettei[*fin++];
774 if (x != image_width)
776 /* pixbufi is useless now */
777 printf("LoadTGA: corrupt file\n");
783 /* BGR or BGRA, RLE */
784 if (targa_header.pixel_size == 32 && alphabits)
786 for (y = 0;y < image_height;y++, pixbufi += row_inci)
788 for (x = 0;x < image_width;)
791 break; /* error - truncated file */
795 /* RLE - all pixels the same color */
797 if (fin + pix_inc > enddata)
798 break; /* error - truncated file */
799 if (x + runlen > image_width)
800 break; /* error - line exceeds width */
811 /* uncompressed - all pixels different color */
813 if (fin + pix_inc * runlen > enddata)
814 break; /* error - truncated file */
815 if (x + runlen > image_width)
816 break; /* error - line exceeds width */
829 if (x != image_width)
831 /* pixbufi is useless now */
832 printf("LoadTGA: corrupt file\n");
839 for (y = 0;y < image_height;y++, pixbufi += row_inci)
841 for (x = 0;x < image_width;)
844 break; /* error - truncated file */
848 /* RLE - all pixels the same color */
850 if (fin + pix_inc > enddata)
851 break; /* error - truncated file */
852 if (x + runlen > image_width)
853 break; /* error - line exceeds width */
864 /* uncompressed - all pixels different color */
866 if (fin + pix_inc * runlen > enddata)
867 break; /* error - truncated file */
868 if (x + runlen > image_width)
869 break; /* error - line exceeds width */
882 if (x != image_width)
884 /* pixbufi is useless now */
885 printf("LoadTGA: corrupt file\n");
892 /* unknown image_type */
899 int Image_WriteTGABGRA (const char *filename, int width, int height, const unsigned char *data)
902 unsigned char *buffer, *out;
903 const unsigned char *in, *end;
906 buffer = (unsigned char *)malloc(width*height*4 + 18);
908 memset (buffer, 0, 18);
909 buffer[2] = 2; /* uncompressed type */
910 buffer[12] = (width >> 0) & 0xFF;
911 buffer[13] = (width >> 8) & 0xFF;
912 buffer[14] = (height >> 0) & 0xFF;
913 buffer[15] = (height >> 8) & 0xFF;
915 for (y = 3;y < width*height*4;y += 4)
919 if (y < width*height*4)
921 /* save the alpha channel */
922 buffer[16] = 32; /* pixel size */
923 buffer[17] = 8; /* 8 bits of alpha */
925 /* flip upside down */
927 for (y = height - 1;y >= 0;y--)
929 memcpy(out, data + y * width * 4, width * 4);
935 /* save only the color channels */
936 buffer[16] = 24; /* pixel size */
937 buffer[17] = 0; /* 8 bits of alpha */
939 /* truncate bgra to bgr and flip upside down */
941 for (y = height - 1;y >= 0;y--)
943 in = data + y * width * 4;
944 end = in + width * 4;
945 for (;in < end;in += 4)
953 ret = FS_WriteFile (filename, buffer, out - buffer);
959 /* START stuff that originates from image.c in DarkPlaces */
961 int usage(const char *me)
963 printf("Usage: %s <infile_norm.tga> <outfile_normandheight.tga> filtertype [<scale> [<offset> [<infile_ref.tga>]]] (get heightmap from normalmap)\n", me);
964 printf("or: %s <infile_height.tga> <outfile_normandheight.tga> filtertype -1 [<scale>] (read from B)\n", me);
965 printf("or: %s <infile_height.tga> <outfile_normandheight.tga> filtertype -2 [<scale>] (read from G)\n", me);
966 printf("or: %s <infile_height.tga> <outfile_normandheight.tga> filtertype -3 [<scale>] (read from R)\n", me);
967 printf("or: %s <infile_height.tga> <outfile_normandheight.tga> filtertype -4 [<scale>] (read from A)\n", me);
968 printf("or: %s <infile_height.tga> <outfile_normandheight.tga> filtertype -5 [<scale>] (read from (R+G+B)/3)\n", me);
969 printf("or: %s <infile_height.tga> <outfile_normandheight.tga> filtertype -6 [<scale>] (read from Y)\n", me);
973 static const double filter_scharr3[3][3] = {
974 { -3/32.0, 0, 3/32.0 },
975 { -10/32.0, 0, 10/32.0 },
976 { -3/32.0, 0, 3/32.0 }
979 static const double filter_prewitt3[3][3] = {
980 { -1/6.0, 0, 1/6.0 },
981 { -1/6.0, 0, 1/6.0 },
985 // pathologic for inverting
986 static const double filter_sobel3[3][3] = {
987 { -1/8.0, 0, 1/8.0 },
988 { -2/8.0, 0, 2/8.0 },
992 // pathologic for inverting
993 static const double filter_sobel5[5][5] = {
994 { -1/128.0, -2/128.0, 0, 2/128.0, 1/128.0 },
995 { -4/128.0, -8/128.0, 0, 8/128.0, 4/128.0 },
996 { -6/128.0, -12/128.0, 0, 12/128.0, 6/128.0 },
997 { -4/128.0, -8/128.0, 0, 8/128.0, 4/128.0 },
998 { -1/128.0, -2/128.0, 0, 2/128.0, 1/128.0 }
1001 // pathologic for inverting
1002 static const double filter_prewitt5[5][5] = {
1003 { -1/40.0, -2/40.0, 0, 2/40.0, 1/40.0 },
1004 { -1/40.0, -2/40.0, 0, 2/40.0, 1/40.0 },
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 }
1010 static const double filter_trivial[1][3] = {
1014 int main(int argc, char **argv)
1016 const char *infile, *outfile, *reffile;
1017 double scale, offset;
1019 unsigned char *nmapdata, *nmap, *refmap;
1020 const char *filtertype;
1021 const double *filter = NULL;
1022 int filterw = 0, filterh = 0;
1023 #define USE_FILTER(f) \
1026 filterw = sizeof(*(f)) / sizeof(**(f)); \
1027 filterh = sizeof((f)) / sizeof(*(f)); \
1028 filter = &(f)[0][0]; \
1035 return usage(*argv);
1040 return usage(*argv);
1043 filtertype = argv[3];
1045 return usage(*argv);
1048 scale = atof(argv[4]);
1053 offset = atof(argv[5]);
1055 offset = (scale<0) ? 1 : 0;
1062 nmapdata = FS_LoadFile(infile, &nmaplen);
1065 printf("FS_LoadFile failed\n");
1068 nmap = LoadTGA_BGRA(nmapdata, nmaplen);
1072 printf("LoadTGA_BGRA failed\n");
1080 nmapdata = FS_LoadFile(reffile, &nmaplen);
1083 printf("FS_LoadFile failed\n");
1086 refmap = LoadTGA_BGRA(nmapdata, nmaplen);
1090 printf("LoadTGA_BGRA failed\n");
1093 if(image_width != w || image_height != h)
1095 printf("reference map must have same size as input normalmap\n");
1102 if(!strcmp(filtertype, "trivial"))
1103 USE_FILTER(filter_trivial);
1104 if(!strcmp(filtertype, "prewitt3"))
1105 USE_FILTER(filter_prewitt3);
1106 if(!strcmp(filtertype, "scharr3"))
1107 USE_FILTER(filter_scharr3);
1108 if(!strcmp(filtertype, "sobel3"))
1109 USE_FILTER(filter_sobel3);
1110 if(!strcmp(filtertype, "prewitt5"))
1111 USE_FILTER(filter_prewitt5);
1112 if(!strcmp(filtertype, "sobel5"))
1113 USE_FILTER(filter_sobel5);
1118 hmap_to_nmap_local(nmap, image_width, image_height, -scale-1, offset, filter, filterw, filterh);
1120 hmap_to_nmap(nmap, image_width, image_height, -scale-1, offset);
1123 nmap_to_hmap(nmap, refmap, image_width, image_height, scale, offset, filter, filterw, filterh);
1125 if(!Image_WriteTGABGRA(outfile, image_width, image_height, nmap))
1127 printf("Image_WriteTGABGRA failed\n");