misc/tools/fft-normalmap-to-heightmap.c

   1 /*
   2  *  FFT based normalmap to heightmap converter
   3  *  Copyright (C) 2010  Rudolf Polzer
   4  *
   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.
   9  *
  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.
  14  *
  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
  18  */
  19
  20 #undef C99
  21 #if __STDC_VERSION__ >= 199901L
  22 #define C99
  23 #endif
  24
  25 #ifdef C99
  26 #include <complex.h>
  27 #endif
  28
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <math.h>
  33
  34 #include <fftw3.h>
  35
  36 #define TWO_PI (4*atan2(1,1) * 2)
  37
  38 void nmap_to_hmap(unsigned char *map, const unsigned char *refmap, int w, int h, double scale, double offset)
  39 {
  40         int x, y;
  41         double nx, ny, nz;
  42         double v, vmin, vmax;
  43 #ifndef C99
  44         double save;
  45 #endif
  46
  47         fftw_complex *imgspace1 = fftw_malloc(w*h * sizeof(fftw_complex));
  48         fftw_complex *imgspace2 = fftw_malloc(w*h * sizeof(fftw_complex));
  49         fftw_complex *freqspace1 = fftw_malloc(w*h * sizeof(fftw_complex));
  50         fftw_complex *freqspace2 = fftw_malloc(w*h * sizeof(fftw_complex));
  51         fftw_plan i12f1 = fftw_plan_dft_2d(w, h, imgspace1, freqspace1, FFTW_FORWARD, FFTW_ESTIMATE);
  52         fftw_plan i22f2 = fftw_plan_dft_2d(w, h, imgspace2, freqspace2, FFTW_FORWARD, FFTW_ESTIMATE);
  53         fftw_plan f12i1 = fftw_plan_dft_2d(w, h, freqspace1, imgspace1, FFTW_BACKWARD, FFTW_ESTIMATE);
  54
  55         for(y = 0; y < h; ++y)
  56         for(x = 0; x < w; ++x)
  57         {
  58                 /*
  59                  * unnormalized normals:
  60                  * n_x = -dh/dx
  61                  * n_y = -dh/dy
  62                  * n_z = -dh/dh = -1
  63                  * BUT: darkplaces uses inverted normals, n_y actually is dh/dy by image pixel coordinates
  64                  */
  65                 nx = ((int)map[(w*y+x)*4+2] - 127.5) / 128;
  66                 ny = ((int)map[(w*y+x)*4+1] - 127.5) / 128;
  67                 nz = ((int)map[(w*y+x)*4+0] - 127.5) / 128;
  68
  69                 /* reconstruct the derivatives from here */
  70 #ifdef C99
  71                 imgspace1[(w*y+x)] =  nx / nz * w; /* = dz/dx */
  72                 imgspace2[(w*y+x)] = -ny / nz * h; /* = dz/dy */
  73 #else
  74                 imgspace1[(w*y+x)][0] =  nx / nz; /* = dz/dx */
  75                 imgspace1[(w*y+x)][1] = 0;
  76                 imgspace2[(w*y+x)][0] = -ny / nz; /* = dz/dy */
  77                 imgspace2[(w*y+x)][1] = 0;
  78 #endif
  79         }
  80
  81         /* see http://www.gamedev.net/community/forums/topic.asp?topic_id=561430 */
  82
  83         fftw_execute(i12f1);
  84         fftw_execute(i22f2);
  85
  86         for(y = 0; y < h; ++y)
  87         for(x = 0; x < w; ++x)
  88         {
  89                 int fx = x;
  90                 int fy = y;
  91                 if(fx > w/2)
  92                         fx -= w;
  93                 if(fy > h/2)
  94                         fy -= h;
  95 #ifdef C99
  96                 if(fx||fy)
  97                         freqspace1[(w*y+x)] = _Complex_I * (fx * freqspace1[(w*y+x)] + fy * freqspace2[(w*y+x)]) / (fx*fx + fy*fy) / TWO_PI;
  98                 else
  99                         freqspace1[(w*y+x)] = 0;
 100 #else
 101                 if(fx||fy)
 102                 {
 103                         save = freqspace1[(w*y+x)][0];
 104                         freqspace1[(w*y+x)][0] = -(fx * freqspace1[(w*y+x)][1] + fy * freqspace2[(w*y+x)][1]) / (fx*fx + fy*fy) / TWO_PI;
 105                         freqspace1[(w*y+x)][1] =  (fx * save + fy * freqspace2[(w*y+x)][0]) / (fx*fx + fy*fy) / TWO_PI;
 106                 }
 107                 else
 108                 {
 109                         freqspace1[(w*y+x)][0] = 0;
 110                         freqspace1[(w*y+x)][1] = 0;
 111                 }
 112 #endif
 113         }
 114
 115         fftw_execute(f12i1);
 116
 117         /* renormalize */
 118         for(y = 0; y < h; ++y)
 119         for(x = 0; x < w; ++x)
 120         {
 121 #ifdef C99
 122                 imgspace1[(w*y+x)] /= (w*h);
 123 #else
 124                 imgspace1[(w*y+x)][0] /= (w*h);
 125                 imgspace1[(w*y+x)][1] /= (w*h);
 126 #endif
 127         }
 128
 129         if(refmap)
 130         {
 131                 double f, a;
 132                 double o, s;
 133                 double sa, sfa, sffa, sfva, sva;
 134                 double mi, ma;
 135                 sa = sfa = sffa = sfva = sva = 0;
 136                 mi = 1;
 137                 ma = -1;
 138                 for(y = 0; y < h; ++y)
 139                 for(x = 0; x < w; ++x)
 140                 {
 141                         a = (int)refmap[(w*y+x)*4+3];
 142                         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);
 143                         v = (v - 128.0) / 127.0;
 144 #ifdef C99
 145                         f = creal(imgspace1[(w*y+x)]);
 146 #else
 147                         f = imgspace1[(w*y+x)][0];
 148 #endif
 149                         if(a <= 0)
 150                                 continue;
 151                         if(v < mi)
 152                                 mi = v;
 153                         if(v > ma)
 154                                 ma = v;
 155                         sa += a;
 156                         sfa += f*a;
 157                         sffa += f*f*a;
 158                         sfva += f*v*a;
 159                         sva += v*a;
 160                 }
 161                 if(mi < ma)
 162                 {
 163                         /* linear regression ftw */
 164                         o = (sfa*sfva - sffa*sva) / (sfa*sfa-sa*sffa);
 165                         s = (sfa*sva - sa*sfva) / (sfa*sfa-sa*sffa);
 166                 }
 167                 else /* all values of v are equal, so we cannot get scale; we can still get offset */
 168                 {
 169                         o = ((sva - sfa) / sa);
 170                         s = 1;
 171                 }
 172
 173                 printf("Ref-computed scale: %f\nRef-computed offset: %f\n", s, o);
 174
 175                 /*
 176                  * now apply user-given offset and scale to these values
 177                  * (x * s + o) * scale + offset
 178                  * x * s * scale + o * scale + offset
 179                  */
 180                 offset += o * scale;
 181                 scale *= s;
 182         }
 183         else if(scale == 0)
 184         {
 185 #ifdef C99
 186                 vmin = vmax = creal(imgspace1[0]);
 187 #else
 188                 vmin = vmax = imgspace1[0][0];
 189 #endif
 190                 for(y = 0; y < h; ++y)
 191                 for(x = 0; x < w; ++x)
 192                 {
 193 #ifdef C99
 194                         v = creal(imgspace1[(w*y+x)]);
 195 #else
 196                         v = imgspace1[(w*y+x)][0];
 197 #endif
 198                         if(v < vmin)
 199                                 vmin = v;
 200                         if(v > vmax)
 201                                 vmax = v;
 202                 }
 203
 204                 /*
 205                  * map vmin to -1
 206                  * map vmax to +1
 207                  */
 208                 scale = 2 / (vmax - vmin);
 209                 offset = -(vmax + vmin) / (vmax - vmin);
 210
 211                 printf("Autocomputed scale: %f\nAutocomputed offset: %f\n", scale, offset);
 212         }
 213
 214         for(y = 0; y < h; ++y)
 215         for(x = 0; x < w; ++x)
 216         {
 217 #ifdef C99
 218                 v = creal(imgspace1[(w*y+x)]);
 219 #else
 220                 v = imgspace1[(w*y+x)][0];
 221 #endif
 222                 v = v * scale + offset;
 223                 if(v < -1)
 224                         v = -1;
 225                 if(v > 1)
 226                         v = 1;
 227                 map[(w*y+x)*4+3] = floor(128.5 + 127 * v);
 228         }
 229
 230         fftw_destroy_plan(i12f1);
 231         fftw_destroy_plan(i22f2);
 232         fftw_destroy_plan(f12i1);
 233
 234         fftw_free(freqspace2);
 235         fftw_free(freqspace1);
 236         fftw_free(imgspace2);
 237         fftw_free(imgspace1);
 238 }
 239
 240 void hmap_to_nmap(unsigned char *map, int w, int h, int src_chan, double scale)
 241 {
 242         int x, y;
 243         double nx, ny, nz;
 244         double v;
 245 #ifndef C99
 246         double save;
 247 #endif
 248
 249         fftw_complex *imgspace1 = fftw_malloc(w*h * sizeof(fftw_complex));
 250         fftw_complex *imgspace2 = fftw_malloc(w*h * sizeof(fftw_complex));
 251         fftw_complex *freqspace1 = fftw_malloc(w*h * sizeof(fftw_complex));
 252         fftw_complex *freqspace2 = fftw_malloc(w*h * sizeof(fftw_complex));
 253         fftw_plan i12f1 = fftw_plan_dft_2d(w, h, imgspace1, freqspace1, FFTW_FORWARD, FFTW_ESTIMATE);
 254         fftw_plan f12i1 = fftw_plan_dft_2d(w, h, freqspace1, imgspace1, FFTW_BACKWARD, FFTW_ESTIMATE);
 255         fftw_plan f22i2 = fftw_plan_dft_2d(w, h, freqspace2, imgspace2, FFTW_BACKWARD, FFTW_ESTIMATE);
 256
 257         for(y = 0; y < h; ++y)
 258         for(x = 0; x < w; ++x)
 259         {
 260                 switch(src_chan)
 261                 {
 262                         case 0:
 263                         case 1:
 264                         case 2:
 265                         case 3:
 266                                 v = map[(w*y+x)*4+src_chan];
 267                                 break;
 268                         case 4:
 269                                 v = (map[(w*y+x)*4+0] + map[(w*y+x)*4+1] + map[(w*y+x)*4+2]) / 3;
 270                                 break;
 271                         default:
 272                         case 5:
 273                                 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);
 274                                 break;
 275                 }
 276 #ifdef C99
 277                 imgspace1[(w*y+x)] = (v - 128.0) / 127.0;
 278 #else
 279                 imgspace1[(w*y+x)][0] = (v - 128.0) / 127.0;
 280                 imgspace1[(w*y+x)][1] = 0;
 281 #endif
 282                 map[(w*y+x)*4+3] = floor(v + 0.5);
 283         }
 284
 285         /* see http://www.gamedev.net/community/forums/topic.asp?topic_id=561430 */
 286
 287         fftw_execute(i12f1);
 288
 289         for(y = 0; y < h; ++y)
 290         for(x = 0; x < w; ++x)
 291         {
 292                 int fx = x;
 293                 int fy = y;
 294                 if(fx > w/2)
 295                         fx -= w;
 296                 if(fy > h/2)
 297                         fy -= h;
 298 #ifdef C99
 299                 /* a lowpass to prevent the worst */
 300                 freqspace1[(w*y+x)] *= 1 - pow(abs(fx) / (double)(w/2), 1);
 301                 freqspace1[(w*y+x)] *= 1 - pow(abs(fy) / (double)(h/2), 1);
 302
 303                 freqspace2[(w*y+x)] = TWO_PI*_Complex_I * fy * freqspace1[(w*y+x)]; /* y derivative */
 304                 freqspace1[(w*y+x)] = TWO_PI*_Complex_I * fx * freqspace1[(w*y+x)]; /* x derivative */
 305 #else
 306                 /* a lowpass to prevent the worst */
 307                 freqspace1[(w*y+x)][0] *= 1 - pow(abs(fx) / (double)(w/2), 1);
 308                 freqspace1[(w*y+x)][1] *= 1 - pow(abs(fx) / (double)(w/2), 1);
 309                 freqspace1[(w*y+x)][0] *= 1 - pow(abs(fy) / (double)(h/2), 1);
 310                 freqspace1[(w*y+x)][1] *= 1 - pow(abs(fy) / (double)(h/2), 1);
 311
 312                 freqspace2[(w*y+x)][0] = -TWO_PI * fy * freqspace1[(w*y+x)][1]; /* y derivative */
 313                 freqspace2[(w*y+x)][1] =  TWO_PI * fy * freqspace1[(w*y+x)][0];
 314                 save = freqspace1[(w*y+x)][0];
 315                 freqspace1[(w*y+x)][0] = -TWO_PI * fx * freqspace1[(w*y+x)][1]; /* x derivative */
 316                 freqspace1[(w*y+x)][1] =  TWO_PI * fx * save;
 317 #endif
 318         }
 319
 320         fftw_execute(f12i1);
 321         fftw_execute(f22i2);
 322
 323         scale /= (w*h);
 324
 325         for(y = 0; y < h; ++y)
 326         for(x = 0; x < w; ++x)
 327         {
 328 #ifdef C99
 329                 nx = creal(imgspace1[(w*y+x)]);
 330                 ny = creal(imgspace2[(w*y+x)]);
 331 #else
 332                 nx = imgspace1[(w*y+x)][0];
 333                 ny = imgspace2[(w*y+x)][0];
 334 #endif
 335                 nx /= w;
 336                 ny /= h;
 337                 nz = -1 / scale;
 338                 v = -sqrt(nx*nx + ny*ny + nz*nz);
 339                 nx /= v;
 340                 ny /= v;
 341                 nz /= v;
 342                 ny = -ny; /* DP inverted normals */
 343                 map[(w*y+x)*4+2] = floor(128 + 127.5 * nx);
 344                 map[(w*y+x)*4+1] = floor(128 + 127.5 * ny);
 345                 map[(w*y+x)*4+0] = floor(128 + 127.5 * nz);
 346         }
 347
 348         fftw_destroy_plan(i12f1);
 349         fftw_destroy_plan(f12i1);
 350         fftw_destroy_plan(f22i2);
 351
 352         fftw_free(freqspace2);
 353         fftw_free(freqspace1);
 354         fftw_free(imgspace2);
 355         fftw_free(imgspace1);
 356 }
 357
 358 void hmap_to_nmap_local(unsigned char *map, int w, int h, int src_chan, double scale)
 359 {
 360         int x, y;
 361         double nx, ny, nz;
 362         double v;
 363         int i, j;
 364         double *img_reduced = malloc(w*h * sizeof(double));
 365         static const double filter[3][3] = { /* filter to derive one component */
 366                 { -1, 0, 1 },
 367                 { -2, 0, 2 },
 368                 { -1, 0, 1 }
 369         };
 370         static const double filter_mult = 0.125;
 371
 372         for(y = 0; y < h; ++y)
 373         for(x = 0; x < w; ++x)
 374         {
 375                 switch(src_chan)
 376                 {
 377                         case 0:
 378                         case 1:
 379                         case 2:
 380                         case 3:
 381                                 v = map[(w*y+x)*4+src_chan];
 382                                 break;
 383                         case 4:
 384                                 v = (map[(w*y+x)*4+0] + map[(w*y+x)*4+1] + map[(w*y+x)*4+2]) / 3;
 385                                 break;
 386                         default:
 387                         case 5:
 388                                 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);
 389                                 break;
 390                 }
 391                 img_reduced[(w*y+x)] = (v - 128.0) / 127.0;
 392                 map[(w*y+x)*4+3] = floor(v + 0.5);
 393         }
 394
 395         for(y = 0; y < h; ++y)
 396         for(x = 0; x < w; ++x)
 397         {
 398                 nz = -1 / (scale * filter_mult);
 399                 nx = ny = 0;
 400
 401                 for(i = -(int)(sizeof(filter) / sizeof(*filter)) / 2; i <= (int)(sizeof(filter) / sizeof(*filter)) / 2; ++i)
 402                         for(j = -(int)(sizeof(*filter) / sizeof(**filter)) / 2; j <= (int)(sizeof(*filter) / sizeof(**filter)) / 2; ++j)
 403                         {
 404                                 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];
 405                                 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];
 406                         }
 407
 408                 v = -sqrt(nx*nx + ny*ny + nz*nz);
 409                 nx /= v;
 410                 ny /= v;
 411                 nz /= v;
 412                 ny = -ny; /* DP inverted normals */
 413                 map[(w*y+x)*4+2] = floor(128 + 127.5 * nx);
 414                 map[(w*y+x)*4+1] = floor(128 + 127.5 * ny);
 415                 map[(w*y+x)*4+0] = floor(128 + 127.5 * nz);
 416         }
 417
 418         free(img_reduced);
 419 }
 420
 421 unsigned char *FS_LoadFile(const char *fn, int *len)
 422 {
 423         unsigned char *buf = NULL;
 424         int n;
 425         FILE *f = fopen(fn, "rb");
 426         *len = 0;
 427         if(!f)
 428                 return NULL;
 429         for(;;)
 430         {
 431                 buf = realloc(buf, *len + 65536);
 432                 if(!buf)
 433                 {
 434                         fclose(f);
 435                         free(buf);
 436                         *len = 0;
 437                         return NULL;
 438                 }
 439                 n = fread(buf + *len, 1, 65536, f);
 440                 if(n < 0)
 441                 {
 442                         fclose(f);
 443                         free(buf);
 444                         *len = 0;
 445                         return NULL;
 446                 }
 447                 *len += n;
 448                 if(n < 65536)
 449                         break;
 450         }
 451         return buf;
 452 }
 453
 454 int FS_WriteFile(const char *fn, unsigned char *data, int len)
 455 {
 456         FILE *f = fopen(fn, "wb");
 457         if(!f)
 458                 return 0;
 459         if(fwrite(data, len, 1, f) != 1)
 460         {
 461                 fclose(f);
 462                 return 0;
 463         }
 464         if(fclose(f))
 465                 return 0;
 466         return 1;
 467 }
 468
 469 /* START stuff that originates from image.c in DarkPlaces */
 470 int image_width, image_height;
 471
 472 typedef struct _TargaHeader
 473 {
 474         unsigned char   id_length, colormap_type, image_type;
 475         unsigned short  colormap_index, colormap_length;
 476         unsigned char   colormap_size;
 477         unsigned short  x_origin, y_origin, width, height;
 478         unsigned char   pixel_size, attributes;
 479 }
 480 TargaHeader;
 481
 482 void PrintTargaHeader(TargaHeader *t)
 483 {
 484         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);
 485 }
 486
 487 unsigned char *LoadTGA_BGRA (const unsigned char *f, int filesize)
 488 {
 489         int x, y, pix_inc, row_inci, runlen, alphabits;
 490         unsigned char *image_buffer;
 491         unsigned int *pixbufi;
 492         const unsigned char *fin, *enddata;
 493         TargaHeader targa_header;
 494         unsigned int palettei[256];
 495         union
 496         {
 497                 unsigned int i;
 498                 unsigned char b[4];
 499         }
 500         bgra;
 501
 502         if (filesize < 19)
 503                 return NULL;
 504
 505         enddata = f + filesize;
 506
 507         targa_header.id_length = f[0];
 508         targa_header.colormap_type = f[1];
 509         targa_header.image_type = f[2];
 510
 511         targa_header.colormap_index = f[3] + f[4] * 256;
 512         targa_header.colormap_length = f[5] + f[6] * 256;
 513         targa_header.colormap_size = f[7];
 514         targa_header.x_origin = f[8] + f[9] * 256;
 515         targa_header.y_origin = f[10] + f[11] * 256;
 516         targa_header.width = image_width = f[12] + f[13] * 256;
 517         targa_header.height = image_height = f[14] + f[15] * 256;
 518         targa_header.pixel_size = f[16];
 519         targa_header.attributes = f[17];
 520
 521         if (image_width > 32768 || image_height > 32768 || image_width <= 0 || image_height <= 0)
 522         {
 523                 printf("LoadTGA: invalid size\n");
 524                 PrintTargaHeader(&targa_header);
 525                 return NULL;
 526         }
 527
 528         /* advance to end of header */
 529         fin = f + 18;
 530
 531         /* skip TARGA image comment (usually 0 bytes) */
 532         fin += targa_header.id_length;
 533
 534         /* read/skip the colormap if present (note: according to the TARGA spec it */
 535         /* can be present even on 1color or greyscale images, just not used by */
 536         /* the image data) */
 537         if (targa_header.colormap_type)
 538         {
 539                 if (targa_header.colormap_length > 256)
 540                 {
 541                         printf("LoadTGA: only up to 256 colormap_length supported\n");
 542                         PrintTargaHeader(&targa_header);
 543                         return NULL;
 544                 }
 545                 if (targa_header.colormap_index)
 546                 {
 547                         printf("LoadTGA: colormap_index not supported\n");
 548                         PrintTargaHeader(&targa_header);
 549                         return NULL;
 550                 }
 551                 if (targa_header.colormap_size == 24)
 552                 {
 553                         for (x = 0;x < targa_header.colormap_length;x++)
 554                         {
 555                                 bgra.b[0] = *fin++;
 556                                 bgra.b[1] = *fin++;
 557                                 bgra.b[2] = *fin++;
 558                                 bgra.b[3] = 255;
 559                                 palettei[x] = bgra.i;
 560                         }
 561                 }
 562                 else if (targa_header.colormap_size == 32)
 563                 {
 564                         memcpy(palettei, fin, targa_header.colormap_length*4);
 565                         fin += targa_header.colormap_length * 4;
 566                 }
 567                 else
 568                 {
 569                         printf("LoadTGA: Only 32 and 24 bit colormap_size supported\n");
 570                         PrintTargaHeader(&targa_header);
 571                         return NULL;
 572                 }
 573         }
 574
 575         /* check our pixel_size restrictions according to image_type */
 576         switch (targa_header.image_type & ~8)
 577         {
 578         case 2:
 579                 if (targa_header.pixel_size != 24 && targa_header.pixel_size != 32)
 580                 {
 581                         printf("LoadTGA: only 24bit and 32bit pixel sizes supported for type 2 and type 10 images\n");
 582                         PrintTargaHeader(&targa_header);
 583                         return NULL;
 584                 }
 585                 break;
 586         case 3:
 587                 /* set up a palette to make the loader easier */
 588                 for (x = 0;x < 256;x++)
 589                 {
 590                         bgra.b[0] = bgra.b[1] = bgra.b[2] = x;
 591                         bgra.b[3] = 255;
 592                         palettei[x] = bgra.i;
 593                 }
 594                 /* fall through to colormap case */
 595         case 1:
 596                 if (targa_header.pixel_size != 8)
 597                 {
 598                         printf("LoadTGA: only 8bit pixel size for type 1, 3, 9, and 11 images supported\n");
 599                         PrintTargaHeader(&targa_header);
 600                         return NULL;
 601                 }
 602                 break;
 603         default:
 604                 printf("LoadTGA: Only type 1, 2, 3, 9, 10, and 11 targa RGB images supported, image_type = %i\n", targa_header.image_type);
 605                 PrintTargaHeader(&targa_header);
 606                 return NULL;
 607         }
 608
 609         if (targa_header.attributes & 0x10)
 610         {
 611                 printf("LoadTGA: origin must be in top left or bottom left, top right and bottom right are not supported\n");
 612                 return NULL;
 613         }
 614
 615         /* number of attribute bits per pixel, we only support 0 or 8 */
 616         alphabits = targa_header.attributes & 0x0F;
 617         if (alphabits != 8 && alphabits != 0)
 618         {
 619                 printf("LoadTGA: only 0 or 8 attribute (alpha) bits supported\n");
 620                 return NULL;
 621         }
 622
 623         image_buffer = (unsigned char *)malloc(image_width * image_height * 4);
 624         if (!image_buffer)
 625         {
 626                 printf("LoadTGA: not enough memory for %i by %i image\n", image_width, image_height);
 627                 return NULL;
 628         }
 629
 630         /* If bit 5 of attributes isn't set, the image has been stored from bottom to top */
 631         if ((targa_header.attributes & 0x20) == 0)
 632         {
 633                 pixbufi = (unsigned int*)image_buffer + (image_height - 1)*image_width;
 634                 row_inci = -image_width*2;
 635         }
 636         else
 637         {
 638                 pixbufi = (unsigned int*)image_buffer;
 639                 row_inci = 0;
 640         }
 641
 642         x = 0;
 643         y = 0;
 644         pix_inc = 1;
 645         if ((targa_header.image_type & ~8) == 2)
 646                 pix_inc = (targa_header.pixel_size + 7) / 8;
 647         switch (targa_header.image_type)
 648         {
 649         case 1: /* colormapped, uncompressed */
 650         case 3: /* greyscale, uncompressed */
 651                 if (fin + image_width * image_height * pix_inc > enddata)
 652                         break;
 653                 for (y = 0;y < image_height;y++, pixbufi += row_inci)
 654                         for (x = 0;x < image_width;x++)
 655                                 *pixbufi++ = palettei[*fin++];
 656                 break;
 657         case 2:
 658                 /* BGR or BGRA, uncompressed */
 659                 if (fin + image_width * image_height * pix_inc > enddata)
 660                         break;
 661                 if (targa_header.pixel_size == 32 && alphabits)
 662                 {
 663                         for (y = 0;y < image_height;y++)
 664                                 memcpy(pixbufi + y * (image_width + row_inci), fin + y * image_width * pix_inc, image_width*4);
 665                 }
 666                 else
 667                 {
 668                         for (y = 0;y < image_height;y++, pixbufi += row_inci)
 669                         {
 670                                 for (x = 0;x < image_width;x++, fin += pix_inc)
 671                                 {
 672                                         bgra.b[0] = fin[0];
 673                                         bgra.b[1] = fin[1];
 674                                         bgra.b[2] = fin[2];
 675                                         bgra.b[3] = 255;
 676                                         *pixbufi++ = bgra.i;
 677                                 }
 678                         }
 679                 }
 680                 break;
 681         case 9: /* colormapped, RLE */
 682         case 11: /* greyscale, RLE */
 683                 for (y = 0;y < image_height;y++, pixbufi += row_inci)
 684                 {
 685                         for (x = 0;x < image_width;)
 686                         {
 687                                 if (fin >= enddata)
 688                                         break; /* error - truncated file */
 689                                 runlen = *fin++;
 690                                 if (runlen & 0x80)
 691                                 {
 692                                         /* RLE - all pixels the same color */
 693                                         runlen += 1 - 0x80;
 694                                         if (fin + pix_inc > enddata)
 695                                                 break; /* error - truncated file */
 696                                         if (x + runlen > image_width)
 697                                                 break; /* error - line exceeds width */
 698                                         bgra.i = palettei[*fin++];
 699                                         for (;runlen--;x++)
 700                                                 *pixbufi++ = bgra.i;
 701                                 }
 702                                 else
 703                                 {
 704                                         /* uncompressed - all pixels different color */
 705                                         runlen++;
 706                                         if (fin + pix_inc * runlen > enddata)
 707                                                 break; /* error - truncated file */
 708                                         if (x + runlen > image_width)
 709                                                 break; /* error - line exceeds width */
 710                                         for (;runlen--;x++)
 711                                                 *pixbufi++ = palettei[*fin++];
 712                                 }
 713                         }
 714
 715                         if (x != image_width)
 716                         {
 717                                 /* pixbufi is useless now */
 718                                 printf("LoadTGA: corrupt file\n");
 719                                 break;
 720                         }
 721                 }
 722                 break;
 723         case 10:
 724                 /* BGR or BGRA, RLE */
 725                 if (targa_header.pixel_size == 32 && alphabits)
 726                 {
 727                         for (y = 0;y < image_height;y++, pixbufi += row_inci)
 728                         {
 729                                 for (x = 0;x < image_width;)
 730                                 {
 731                                         if (fin >= enddata)
 732                                                 break; /* error - truncated file */
 733                                         runlen = *fin++;
 734                                         if (runlen & 0x80)
 735                                         {
 736                                                 /* RLE - all pixels the same color */
 737                                                 runlen += 1 - 0x80;
 738                                                 if (fin + pix_inc > enddata)
 739                                                         break; /* error - truncated file */
 740                                                 if (x + runlen > image_width)
 741                                                         break; /* error - line exceeds width */
 742                                                 bgra.b[0] = fin[0];
 743                                                 bgra.b[1] = fin[1];
 744                                                 bgra.b[2] = fin[2];
 745                                                 bgra.b[3] = fin[3];
 746                                                 fin += pix_inc;
 747                                                 for (;runlen--;x++)
 748                                                         *pixbufi++ = bgra.i;
 749                                         }
 750                                         else
 751                                         {
 752                                                 /* uncompressed - all pixels different color */
 753                                                 runlen++;
 754                                                 if (fin + pix_inc * runlen > enddata)
 755                                                         break; /* error - truncated file */
 756                                                 if (x + runlen > image_width)
 757                                                         break; /* error - line exceeds width */
 758                                                 for (;runlen--;x++)
 759                                                 {
 760                                                         bgra.b[0] = fin[0];
 761                                                         bgra.b[1] = fin[1];
 762                                                         bgra.b[2] = fin[2];
 763                                                         bgra.b[3] = fin[3];
 764                                                         fin += pix_inc;
 765                                                         *pixbufi++ = bgra.i;
 766                                                 }
 767                                         }
 768                                 }
 769
 770                                 if (x != image_width)
 771                                 {
 772                                         /* pixbufi is useless now */
 773                                         printf("LoadTGA: corrupt file\n");
 774                                         break;
 775                                 }
 776                         }
 777                 }
 778                 else
 779                 {
 780                         for (y = 0;y < image_height;y++, pixbufi += row_inci)
 781                         {
 782                                 for (x = 0;x < image_width;)
 783                                 {
 784                                         if (fin >= enddata)
 785                                                 break; /* error - truncated file */
 786                                         runlen = *fin++;
 787                                         if (runlen & 0x80)
 788                                         {
 789                                                 /* RLE - all pixels the same color */
 790                                                 runlen += 1 - 0x80;
 791                                                 if (fin + pix_inc > enddata)
 792                                                         break; /* error - truncated file */
 793                                                 if (x + runlen > image_width)
 794                                                         break; /* error - line exceeds width */
 795                                                 bgra.b[0] = fin[0];
 796                                                 bgra.b[1] = fin[1];
 797                                                 bgra.b[2] = fin[2];
 798                                                 bgra.b[3] = 255;
 799                                                 fin += pix_inc;
 800                                                 for (;runlen--;x++)
 801                                                         *pixbufi++ = bgra.i;
 802                                         }
 803                                         else
 804                                         {
 805                                                 /* uncompressed - all pixels different color */
 806                                                 runlen++;
 807                                                 if (fin + pix_inc * runlen > enddata)
 808                                                         break; /* error - truncated file */
 809                                                 if (x + runlen > image_width)
 810                                                         break; /* error - line exceeds width */
 811                                                 for (;runlen--;x++)
 812                                                 {
 813                                                         bgra.b[0] = fin[0];
 814                                                         bgra.b[1] = fin[1];
 815                                                         bgra.b[2] = fin[2];
 816                                                         bgra.b[3] = 255;
 817                                                         fin += pix_inc;
 818                                                         *pixbufi++ = bgra.i;
 819                                                 }
 820                                         }
 821                                 }
 822
 823                                 if (x != image_width)
 824                                 {
 825                                         /* pixbufi is useless now */
 826                                         printf("LoadTGA: corrupt file\n");
 827                                         break;
 828                                 }
 829                         }
 830                 }
 831                 break;
 832         default:
 833                 /* unknown image_type */
 834                 break;
 835         }
 836
 837         return image_buffer;
 838 }
 839
 840 int Image_WriteTGABGRA (const char *filename, int width, int height, const unsigned char *data)
 841 {
 842         int y;
 843         unsigned char *buffer, *out;
 844         const unsigned char *in, *end;
 845         int ret;
 846
 847         buffer = (unsigned char *)malloc(width*height*4 + 18);
 848
 849         memset (buffer, 0, 18);
 850         buffer[2] = 2;          /* uncompressed type */
 851         buffer[12] = (width >> 0) & 0xFF;
 852         buffer[13] = (width >> 8) & 0xFF;
 853         buffer[14] = (height >> 0) & 0xFF;
 854         buffer[15] = (height >> 8) & 0xFF;
 855
 856         for (y = 3;y < width*height*4;y += 4)
 857                 if (data[y] < 255)
 858                         break;
 859
 860         if (y < width*height*4)
 861         {
 862                 /* save the alpha channel */
 863                 buffer[16] = 32;        /* pixel size */
 864                 buffer[17] = 8; /* 8 bits of alpha */
 865
 866                 /* flip upside down */
 867                 out = buffer + 18;
 868                 for (y = height - 1;y >= 0;y--)
 869                 {
 870                         memcpy(out, data + y * width * 4, width * 4);
 871                         out += width*4;
 872                 }
 873         }
 874         else
 875         {
 876                 /* save only the color channels */
 877                 buffer[16] = 24;        /* pixel size */
 878                 buffer[17] = 0; /* 8 bits of alpha */
 879
 880                 /* truncate bgra to bgr and flip upside down */
 881                 out = buffer + 18;
 882                 for (y = height - 1;y >= 0;y--)
 883                 {
 884                         in = data + y * width * 4;
 885                         end = in + width * 4;
 886                         for (;in < end;in += 4)
 887                         {
 888                                 *out++ = in[0];
 889                                 *out++ = in[1];
 890                                 *out++ = in[2];
 891                         }
 892                 }
 893         }
 894         ret = FS_WriteFile (filename, buffer, out - buffer);
 895
 896         free(buffer);
 897
 898         return ret;
 899 }
 900 /* START stuff that originates from image.c in DarkPlaces */
 901
 902 int usage(const char *me)
 903 {
 904         printf("Usage: %s <infile_norm.tga> <outfile_normandheight.tga> [<scale> [<offset> [<infile_ref.tga>]]] (get heightmap from normalmap)\n", me);
 905         printf("or:    %s <infile_height.tga> <outfile_normandheight.tga> -1 [<scale>] (read from B, Diff)\n", me);
 906         printf("or:    %s <infile_height.tga> <outfile_normandheight.tga> -2 [<scale>] (read from G, Diff)\n", me);
 907         printf("or:    %s <infile_height.tga> <outfile_normandheight.tga> -3 [<scale>] (read from R, Diff)\n", me);
 908         printf("or:    %s <infile_height.tga> <outfile_normandheight.tga> -4 [<scale>] (read from A, Diff)\n", me);
 909         printf("or:    %s <infile_height.tga> <outfile_normandheight.tga> -5 [<scale>] (read from (R+G+B)/3, Diff)\n", me);
 910         printf("or:    %s <infile_height.tga> <outfile_normandheight.tga> -6 [<scale>] (read from Y, Diff)\n", me);
 911         printf("or:    %s <infile_height.tga> <outfile_normandheight.tga> -7 [<scale>] (read from B, FFT)\n", me);
 912         printf("or:    %s <infile_height.tga> <outfile_normandheight.tga> -8 [<scale>] (read from G, FFT)\n", me);
 913         printf("or:    %s <infile_height.tga> <outfile_normandheight.tga> -9 [<scale>] (read from R, FFT)\n", me);
 914         printf("or:    %s <infile_height.tga> <outfile_normandheight.tga> -10 [<scale>] (read from A, FFT)\n", me);
 915         printf("or:    %s <infile_height.tga> <outfile_normandheight.tga> -11 [<scale>] (read from (R+G+B)/3, FFT)\n", me);
 916         printf("or:    %s <infile_height.tga> <outfile_normandheight.tga> -12 [<scale>] (read from Y, FFT)\n", me);
 917         return 1;
 918 }
 919
 920 int main(int argc, char **argv)
 921 {
 922         const char *infile, *outfile, *reffile;
 923         double scale, offset;
 924         int nmaplen, w, h;
 925         unsigned char *nmapdata, *nmap, *refmap;
 926
 927         if(argc > 1)
 928                 infile = argv[1];
 929         else
 930                 return usage(*argv);
 931
 932         if(argc > 2)
 933                 outfile = argv[2];
 934         else
 935                 return usage(*argv);
 936
 937         if(argc > 3)
 938                 scale = atof(argv[3]);
 939         else
 940                 scale = 0;
 941
 942         if(argc > 4)
 943                 offset = atof(argv[4]);
 944         else
 945                 offset = (scale<0) ? 1 : 0;
 946
 947         if(argc > 5)
 948                 reffile = argv[5];
 949         else
 950                 reffile = NULL;
 951
 952         nmapdata = FS_LoadFile(infile, &nmaplen);
 953         if(!nmapdata)
 954         {
 955                 printf("FS_LoadFile failed\n");
 956                 return 2;
 957         }
 958         nmap = LoadTGA_BGRA(nmapdata, nmaplen);
 959         free(nmapdata);
 960         if(!nmap)
 961         {
 962                 printf("LoadTGA_BGRA failed\n");
 963                 return 2;
 964         }
 965         w = image_width;
 966         h = image_height;
 967
 968         if(reffile)
 969         {
 970                 nmapdata = FS_LoadFile(reffile, &nmaplen);
 971                 if(!nmapdata)
 972                 {
 973                         printf("FS_LoadFile failed\n");
 974                         return 2;
 975                 }
 976                 refmap = LoadTGA_BGRA(nmapdata, nmaplen);
 977                 free(nmapdata);
 978                 if(!refmap)
 979                 {
 980                         printf("LoadTGA_BGRA failed\n");
 981                         return 2;
 982                 }
 983                 if(image_width != w || image_height != h)
 984                 {
 985                         printf("reference map must have same size as input normalmap\n");
 986                         return 2;
 987                 }
 988         }
 989         else
 990                 refmap = NULL;
 991
 992         if(scale < -6)
 993                 hmap_to_nmap(nmap, image_width, image_height, -scale-7, offset);
 994         else if(scale < 0)
 995                 hmap_to_nmap_local(nmap, image_width, image_height, -scale-1, offset);
 996         else
 997                 nmap_to_hmap(nmap, refmap, image_width, image_height, scale, offset);
 998         if(!Image_WriteTGABGRA(outfile, image_width, image_height, nmap))
 999         {
1000                 printf("Image_WriteTGABGRA failed\n");
1001                 free(nmap);
1002                 return 2;
1003         }
1004         free(nmap);
1005         return 0;
1006 }