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         int fx, fy;
  42         int ffx, ffy;
  43         double nx, ny, nz;
  44         double v, vmin, vmax;
  45 #ifndef C99
  46         double save;
  47 #endif
  48
  49         fftw_complex *imgspace1 = fftw_malloc(w*h * sizeof(fftw_complex));
  50         fftw_complex *imgspace2 = fftw_malloc(w*h * sizeof(fftw_complex));
  51         fftw_complex *freqspace1 = fftw_malloc(w*h * sizeof(fftw_complex));
  52         fftw_complex *freqspace2 = fftw_malloc(w*h * sizeof(fftw_complex));
  53         fftw_plan i12f1 = fftw_plan_dft_2d(h, w, imgspace1, freqspace1, FFTW_FORWARD, FFTW_ESTIMATE);
  54         fftw_plan i22f2 = fftw_plan_dft_2d(h, w, imgspace2, freqspace2, FFTW_FORWARD, FFTW_ESTIMATE);
  55         fftw_plan f12i1 = fftw_plan_dft_2d(h, w, freqspace1, imgspace1, FFTW_BACKWARD, FFTW_ESTIMATE);
  56
  57         for(y = 0; y < h; ++y)
  58         for(x = 0; x < w; ++x)
  59         {
  60                 /*
  61                  * unnormalized normals:
  62                  * n_x = -dh/dx
  63                  * n_y = -dh/dy
  64                  * n_z = -dh/dh = -1
  65                  * BUT: darkplaces uses inverted normals, n_y actually is dh/dy by image pixel coordinates
  66                  */
  67                 nx = ((int)map[(w*y+x)*4+2] - 127.5) / 128;
  68                 ny = ((int)map[(w*y+x)*4+1] - 127.5) / 128;
  69                 nz = ((int)map[(w*y+x)*4+0] - 127.5) / 128;
  70
  71                 /* reconstruct the derivatives from here */
  72 #ifdef C99
  73                 imgspace1[(w*y+x)] =  nx / nz * w; /* = dz/dx */
  74                 imgspace2[(w*y+x)] = -ny / nz * h; /* = dz/dy */
  75 #else
  76                 imgspace1[(w*y+x)][0] =  nx / nz; /* = dz/dx */
  77                 imgspace1[(w*y+x)][1] = 0;
  78                 imgspace2[(w*y+x)][0] = -ny / nz; /* = dz/dy */
  79                 imgspace2[(w*y+x)][1] = 0;
  80 #endif
  81         }
  82
  83         /* see http://www.gamedev.net/community/forums/topic.asp?topic_id=561430 */
  84
  85         fftw_execute(i12f1);
  86         fftw_execute(i22f2);
  87
  88         for(y = 0; y < h; ++y)
  89         for(x = 0; x < w; ++x)
  90         {
  91                 fx = x;
  92                 fy = y;
  93                 if(fx > w/2)
  94                         fx -= w;
  95                 if(fy > h/2)
  96                         fy -= h;
  97                 /* these must have the same sign as fx and fy (so ffx*fx + ffy*fy is nonzero), otherwise do not matter */
  98                 ffx = fx;
  99                 ffy = fy;
 100 #ifdef C99
 101                 if(fx||fy)
 102                         freqspace1[(w*y+x)] = _Complex_I * (ffx * freqspace1[(w*y+x)] + ffy * freqspace2[(w*y+x)]) / (ffx*fx + ffy*fy) / TWO_PI;
 103                 else
 104                         freqspace1[(w*y+x)] = 0;
 105 #else
 106                 if(fx||fy)
 107                 {
 108                         save = freqspace1[(w*y+x)][0];
 109                         freqspace1[(w*y+x)][0] = -(ffx * freqspace1[(w*y+x)][1] + ffy * freqspace2[(w*y+x)][1]) / (ffx*fx + ffy*fy) / TWO_PI;
 110                         freqspace1[(w*y+x)][1] =  (ffx * save + ffy * freqspace2[(w*y+x)][0]) / (ffx*fx + ffy*fy) / TWO_PI;
 111                 }
 112                 else
 113                 {
 114                         freqspace1[(w*y+x)][0] = 0;
 115                         freqspace1[(w*y+x)][1] = 0;
 116                 }
 117 #endif
 118         }
 119
 120         fftw_execute(f12i1);
 121
 122         /* renormalize, find min/max */
 123         vmin = vmax = 0;
 124         for(y = 0; y < h; ++y)
 125         for(x = 0; x < w; ++x)
 126         {
 127 #ifdef C99
 128                 v = creal(imgspace1[(w*y+x)] /= (w*h));
 129 #else
 130                 v = (imgspace1[(w*y+x)][0] /= (w*h));
 131                 imgspace1[(w*y+x)][1] /= (w*h);
 132 #endif
 133                 if(v < vmin || (x == 0 && y == 0))
 134                         vmin = v;
 135                 if(v > vmax || (x == 0 && y == 0))
 136                         vmax = v;
 137         }
 138
 139         if(refmap)
 140         {
 141                 double f, a;
 142                 double o, s;
 143                 double sa, sfa, sffa, sfva, sva;
 144                 double mi, ma;
 145                 sa = sfa = sffa = sfva = sva = 0;
 146                 mi = 1;
 147                 ma = -1;
 148                 for(y = 0; y < h; ++y)
 149                 for(x = 0; x < w; ++x)
 150                 {
 151                         a = (int)refmap[(w*y+x)*4+3];
 152                         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);
 153                         v = (v - 128.0) / 127.0;
 154 #ifdef C99
 155                         f = creal(imgspace1[(w*y+x)]);
 156 #else
 157                         f = imgspace1[(w*y+x)][0];
 158 #endif
 159                         if(a <= 0)
 160                                 continue;
 161                         if(v < mi)
 162                                 mi = v;
 163                         if(v > ma)
 164                                 ma = v;
 165                         sa += a;
 166                         sfa += f*a;
 167                         sffa += f*f*a;
 168                         sfva += f*v*a;
 169                         sva += v*a;
 170                 }
 171                 if(mi < ma)
 172                 {
 173                         /* linear regression ftw */
 174                         o = (sfa*sfva - sffa*sva) / (sfa*sfa-sa*sffa);
 175                         s = (sfa*sva - sa*sfva) / (sfa*sfa-sa*sffa);
 176                 }
 177                 else /* all values of v are equal, so we cannot get scale; we can still get offset */
 178                 {
 179                         o = ((sva - sfa) / sa);
 180                         s = 1;
 181                 }
 182
 183                 /*
 184                  * now apply user-given offset and scale to these values
 185                  * (x * s + o) * scale + offset
 186                  * x * s * scale + o * scale + offset
 187                  */
 188                 offset += o * scale;
 189                 scale *= s;
 190         }
 191         else if(scale == 0)
 192         {
 193                 /*
 194                  * map vmin to -1
 195                  * map vmax to +1
 196                  */
 197                 scale = 2 / (vmax - vmin);
 198                 offset = -(vmax + vmin) / (vmax - vmin);
 199         }
 200
 201         printf("Min: %f\nAvg: %f\nMax: %f\nScale: %f\nOffset: %f\nScaled-Min: %f\nScaled-Avg: %f\nScaled-Max: %f\n",
 202                 vmin, 0.0, vmax, scale, offset, vmin * scale + offset, offset, vmax * scale + offset);
 203
 204         for(y = 0; y < h; ++y)
 205         for(x = 0; x < w; ++x)
 206         {
 207 #ifdef C99
 208                 v = creal(imgspace1[(w*y+x)]);
 209 #else
 210                 v = imgspace1[(w*y+x)][0];
 211 #endif
 212                 v = v * scale + offset;
 213                 if(v < -1)
 214                         v = -1;
 215                 if(v > 1)
 216                         v = 1;
 217                 map[(w*y+x)*4+3] = floor(128.5 + 127 * v);
 218         }
 219
 220         fftw_destroy_plan(i12f1);
 221         fftw_destroy_plan(i22f2);
 222         fftw_destroy_plan(f12i1);
 223
 224         fftw_free(freqspace2);
 225         fftw_free(freqspace1);
 226         fftw_free(imgspace2);
 227         fftw_free(imgspace1);
 228 }
 229
 230 void hmap_to_nmap(unsigned char *map, int w, int h, int src_chan, double scale)
 231 {
 232         int x, y;
 233         double nx, ny, nz;
 234         double v;
 235 #ifndef C99
 236         double save;
 237 #endif
 238
 239         fftw_complex *imgspace1 = fftw_malloc(w*h * sizeof(fftw_complex));
 240         fftw_complex *imgspace2 = fftw_malloc(w*h * sizeof(fftw_complex));
 241         fftw_complex *freqspace1 = fftw_malloc(w*h * sizeof(fftw_complex));
 242         fftw_complex *freqspace2 = fftw_malloc(w*h * sizeof(fftw_complex));
 243         fftw_plan i12f1 = fftw_plan_dft_2d(h, w, imgspace1, freqspace1, FFTW_FORWARD, FFTW_ESTIMATE);
 244         fftw_plan f12i1 = fftw_plan_dft_2d(h, w, freqspace1, imgspace1, FFTW_BACKWARD, FFTW_ESTIMATE);
 245         fftw_plan f22i2 = fftw_plan_dft_2d(h, w, freqspace2, imgspace2, FFTW_BACKWARD, FFTW_ESTIMATE);
 246
 247         for(y = 0; y < h; ++y)
 248         for(x = 0; x < w; ++x)
 249         {
 250                 switch(src_chan)
 251                 {
 252                         case 0:
 253                         case 1:
 254                         case 2:
 255                         case 3:
 256                                 v = map[(w*y+x)*4+src_chan];
 257                                 break;
 258                         case 4:
 259                                 v = (map[(w*y+x)*4+0] + map[(w*y+x)*4+1] + map[(w*y+x)*4+2]) / 3;
 260                                 break;
 261                         default:
 262                         case 5:
 263                                 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);
 264                                 break;
 265                 }
 266 #ifdef C99
 267                 imgspace1[(w*y+x)] = (v - 128.0) / 127.0;
 268 #else
 269                 imgspace1[(w*y+x)][0] = (v - 128.0) / 127.0;
 270                 imgspace1[(w*y+x)][1] = 0;
 271 #endif
 272                 map[(w*y+x)*4+3] = floor(v + 0.5);
 273         }
 274
 275         /* see http://www.gamedev.net/community/forums/topic.asp?topic_id=561430 */
 276
 277         fftw_execute(i12f1);
 278
 279         for(y = 0; y < h; ++y)
 280         for(x = 0; x < w; ++x)
 281         {
 282                 int fx = x;
 283                 int fy = y;
 284                 if(fx > w/2)
 285                         fx -= w;
 286                 if(fy > h/2)
 287                         fy -= h;
 288 #ifdef C99
 289                 /* a lowpass to prevent the worst */
 290                 freqspace1[(w*y+x)] *= 1 - pow(abs(fx) / (double)(w/2), 1);
 291                 freqspace1[(w*y+x)] *= 1 - pow(abs(fy) / (double)(h/2), 1);
 292
 293                 freqspace2[(w*y+x)] = TWO_PI*_Complex_I * fy * freqspace1[(w*y+x)]; /* y derivative */
 294                 freqspace1[(w*y+x)] = TWO_PI*_Complex_I * fx * freqspace1[(w*y+x)]; /* x derivative */
 295 #else
 296                 /* a lowpass to prevent the worst */
 297                 freqspace1[(w*y+x)][0] *= 1 - pow(abs(fx) / (double)(w/2), 1);
 298                 freqspace1[(w*y+x)][1] *= 1 - pow(abs(fx) / (double)(w/2), 1);
 299                 freqspace1[(w*y+x)][0] *= 1 - pow(abs(fy) / (double)(h/2), 1);
 300                 freqspace1[(w*y+x)][1] *= 1 - pow(abs(fy) / (double)(h/2), 1);
 301
 302                 freqspace2[(w*y+x)][0] = -TWO_PI * fy * freqspace1[(w*y+x)][1]; /* y derivative */
 303                 freqspace2[(w*y+x)][1] =  TWO_PI * fy * freqspace1[(w*y+x)][0];
 304                 save = freqspace1[(w*y+x)][0];
 305                 freqspace1[(w*y+x)][0] = -TWO_PI * fx * freqspace1[(w*y+x)][1]; /* x derivative */
 306                 freqspace1[(w*y+x)][1] =  TWO_PI * fx * save;
 307 #endif
 308         }
 309
 310         fftw_execute(f12i1);
 311         fftw_execute(f22i2);
 312
 313         scale /= (w*h);
 314
 315         for(y = 0; y < h; ++y)
 316         for(x = 0; x < w; ++x)
 317         {
 318 #ifdef C99
 319                 nx = creal(imgspace1[(w*y+x)]);
 320                 ny = creal(imgspace2[(w*y+x)]);
 321 #else
 322                 nx = imgspace1[(w*y+x)][0];
 323                 ny = imgspace2[(w*y+x)][0];
 324 #endif
 325                 nx /= w;
 326                 ny /= h;
 327                 nz = -1 / scale;
 328                 v = -sqrt(nx*nx + ny*ny + nz*nz);
 329                 nx /= v;
 330                 ny /= v;
 331                 nz /= v;
 332                 ny = -ny; /* DP inverted normals */
 333                 map[(w*y+x)*4+2] = floor(128 + 127.5 * nx);
 334                 map[(w*y+x)*4+1] = floor(128 + 127.5 * ny);
 335                 map[(w*y+x)*4+0] = floor(128 + 127.5 * nz);
 336         }
 337
 338         fftw_destroy_plan(i12f1);
 339         fftw_destroy_plan(f12i1);
 340         fftw_destroy_plan(f22i2);
 341
 342         fftw_free(freqspace2);
 343         fftw_free(freqspace1);
 344         fftw_free(imgspace2);
 345         fftw_free(imgspace1);
 346 }
 347
 348 void hmap_to_nmap_local(unsigned char *map, int w, int h, int src_chan, double scale)
 349 {
 350         int x, y;
 351         double nx, ny, nz;
 352         double v;
 353         int i, j;
 354         double *img_reduced = malloc(w*h * sizeof(double));
 355         static const double filter[3][3] = { /* filter to derive one component */
 356                 { -1, 0, 1 },
 357                 { -2, 0, 2 },
 358                 { -1, 0, 1 }
 359         };
 360         static const double filter_mult = 0.125;
 361
 362         for(y = 0; y < h; ++y)
 363         for(x = 0; x < w; ++x)
 364         {
 365                 switch(src_chan)
 366                 {
 367                         case 0:
 368                         case 1:
 369                         case 2:
 370                         case 3:
 371                                 v = map[(w*y+x)*4+src_chan];
 372                                 break;
 373                         case 4:
 374                                 v = (map[(w*y+x)*4+0] + map[(w*y+x)*4+1] + map[(w*y+x)*4+2]) / 3;
 375                                 break;
 376                         default:
 377                         case 5:
 378                                 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);
 379                                 break;
 380                 }
 381                 img_reduced[(w*y+x)] = (v - 128.0) / 127.0;
 382                 map[(w*y+x)*4+3] = floor(v + 0.5);
 383         }
 384
 385         for(y = 0; y < h; ++y)
 386         for(x = 0; x < w; ++x)
 387         {
 388                 nz = -1 / (scale * filter_mult);
 389                 nx = ny = 0;
 390
 391                 for(i = -(int)(sizeof(filter) / sizeof(*filter)) / 2; i <= (int)(sizeof(filter) / sizeof(*filter)) / 2; ++i)
 392                         for(j = -(int)(sizeof(*filter) / sizeof(**filter)) / 2; j <= (int)(sizeof(*filter) / sizeof(**filter)) / 2; ++j)
 393                         {
 394                                 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];
 395                                 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];
 396                         }
 397
 398                 v = -sqrt(nx*nx + ny*ny + nz*nz);
 399                 nx /= v;
 400                 ny /= v;
 401                 nz /= v;
 402                 ny = -ny; /* DP inverted normals */
 403                 map[(w*y+x)*4+2] = floor(128 + 127.5 * nx);
 404                 map[(w*y+x)*4+1] = floor(128 + 127.5 * ny);
 405                 map[(w*y+x)*4+0] = floor(128 + 127.5 * nz);
 406         }
 407
 408         free(img_reduced);
 409 }
 410
 411 unsigned char *FS_LoadFile(const char *fn, int *len)
 412 {
 413         unsigned char *buf = NULL;
 414         int n;
 415         FILE *f = fopen(fn, "rb");
 416         *len = 0;
 417         if(!f)
 418                 return NULL;
 419         for(;;)
 420         {
 421                 buf = realloc(buf, *len + 65536);
 422                 if(!buf)
 423                 {
 424                         fclose(f);
 425                         free(buf);
 426                         *len = 0;
 427                         return NULL;
 428                 }
 429                 n = fread(buf + *len, 1, 65536, f);
 430                 if(n < 0)
 431                 {
 432                         fclose(f);
 433                         free(buf);
 434                         *len = 0;
 435                         return NULL;
 436                 }
 437                 *len += n;
 438                 if(n < 65536)
 439                         break;
 440         }
 441         return buf;
 442 }
 443
 444 int FS_WriteFile(const char *fn, unsigned char *data, int len)
 445 {
 446         FILE *f = fopen(fn, "wb");
 447         if(!f)
 448                 return 0;
 449         if(fwrite(data, len, 1, f) != 1)
 450         {
 451                 fclose(f);
 452                 return 0;
 453         }
 454         if(fclose(f))
 455                 return 0;
 456         return 1;
 457 }
 458
 459 /* START stuff that originates from image.c in DarkPlaces */
 460 int image_width, image_height;
 461
 462 typedef struct _TargaHeader
 463 {
 464         unsigned char   id_length, colormap_type, image_type;
 465         unsigned short  colormap_index, colormap_length;
 466         unsigned char   colormap_size;
 467         unsigned short  x_origin, y_origin, width, height;
 468         unsigned char   pixel_size, attributes;
 469 }
 470 TargaHeader;
 471
 472 void PrintTargaHeader(TargaHeader *t)
 473 {
 474         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);
 475 }
 476
 477 unsigned char *LoadTGA_BGRA (const unsigned char *f, int filesize)
 478 {
 479         int x, y, pix_inc, row_inci, runlen, alphabits;
 480         unsigned char *image_buffer;
 481         unsigned int *pixbufi;
 482         const unsigned char *fin, *enddata;
 483         TargaHeader targa_header;
 484         unsigned int palettei[256];
 485         union
 486         {
 487                 unsigned int i;
 488                 unsigned char b[4];
 489         }
 490         bgra;
 491
 492         if (filesize < 19)
 493                 return NULL;
 494
 495         enddata = f + filesize;
 496
 497         targa_header.id_length = f[0];
 498         targa_header.colormap_type = f[1];
 499         targa_header.image_type = f[2];
 500
 501         targa_header.colormap_index = f[3] + f[4] * 256;
 502         targa_header.colormap_length = f[5] + f[6] * 256;
 503         targa_header.colormap_size = f[7];
 504         targa_header.x_origin = f[8] + f[9] * 256;
 505         targa_header.y_origin = f[10] + f[11] * 256;
 506         targa_header.width = image_width = f[12] + f[13] * 256;
 507         targa_header.height = image_height = f[14] + f[15] * 256;
 508         targa_header.pixel_size = f[16];
 509         targa_header.attributes = f[17];
 510
 511         if (image_width > 32768 || image_height > 32768 || image_width <= 0 || image_height <= 0)
 512         {
 513                 printf("LoadTGA: invalid size\n");
 514                 PrintTargaHeader(&targa_header);
 515                 return NULL;
 516         }
 517
 518         /* advance to end of header */
 519         fin = f + 18;
 520
 521         /* skip TARGA image comment (usually 0 bytes) */
 522         fin += targa_header.id_length;
 523
 524         /* read/skip the colormap if present (note: according to the TARGA spec it */
 525         /* can be present even on 1color or greyscale images, just not used by */
 526         /* the image data) */
 527         if (targa_header.colormap_type)
 528         {
 529                 if (targa_header.colormap_length > 256)
 530                 {
 531                         printf("LoadTGA: only up to 256 colormap_length supported\n");
 532                         PrintTargaHeader(&targa_header);
 533                         return NULL;
 534                 }
 535                 if (targa_header.colormap_index)
 536                 {
 537                         printf("LoadTGA: colormap_index not supported\n");
 538                         PrintTargaHeader(&targa_header);
 539                         return NULL;
 540                 }
 541                 if (targa_header.colormap_size == 24)
 542                 {
 543                         for (x = 0;x < targa_header.colormap_length;x++)
 544                         {
 545                                 bgra.b[0] = *fin++;
 546                                 bgra.b[1] = *fin++;
 547                                 bgra.b[2] = *fin++;
 548                                 bgra.b[3] = 255;
 549                                 palettei[x] = bgra.i;
 550                         }
 551                 }
 552                 else if (targa_header.colormap_size == 32)
 553                 {
 554                         memcpy(palettei, fin, targa_header.colormap_length*4);
 555                         fin += targa_header.colormap_length * 4;
 556                 }
 557                 else
 558                 {
 559                         printf("LoadTGA: Only 32 and 24 bit colormap_size supported\n");
 560                         PrintTargaHeader(&targa_header);
 561                         return NULL;
 562                 }
 563         }
 564
 565         /* check our pixel_size restrictions according to image_type */
 566         switch (targa_header.image_type & ~8)
 567         {
 568         case 2:
 569                 if (targa_header.pixel_size != 24 && targa_header.pixel_size != 32)
 570                 {
 571                         printf("LoadTGA: only 24bit and 32bit pixel sizes supported for type 2 and type 10 images\n");
 572                         PrintTargaHeader(&targa_header);
 573                         return NULL;
 574                 }
 575                 break;
 576         case 3:
 577                 /* set up a palette to make the loader easier */
 578                 for (x = 0;x < 256;x++)
 579                 {
 580                         bgra.b[0] = bgra.b[1] = bgra.b[2] = x;
 581                         bgra.b[3] = 255;
 582                         palettei[x] = bgra.i;
 583                 }
 584                 /* fall through to colormap case */
 585         case 1:
 586                 if (targa_header.pixel_size != 8)
 587                 {
 588                         printf("LoadTGA: only 8bit pixel size for type 1, 3, 9, and 11 images supported\n");
 589                         PrintTargaHeader(&targa_header);
 590                         return NULL;
 591                 }
 592                 break;
 593         default:
 594                 printf("LoadTGA: Only type 1, 2, 3, 9, 10, and 11 targa RGB images supported, image_type = %i\n", targa_header.image_type);
 595                 PrintTargaHeader(&targa_header);
 596                 return NULL;
 597         }
 598
 599         if (targa_header.attributes & 0x10)
 600         {
 601                 printf("LoadTGA: origin must be in top left or bottom left, top right and bottom right are not supported\n");
 602                 return NULL;
 603         }
 604
 605         /* number of attribute bits per pixel, we only support 0 or 8 */
 606         alphabits = targa_header.attributes & 0x0F;
 607         if (alphabits != 8 && alphabits != 0)
 608         {
 609                 printf("LoadTGA: only 0 or 8 attribute (alpha) bits supported\n");
 610                 return NULL;
 611         }
 612
 613         image_buffer = (unsigned char *)malloc(image_width * image_height * 4);
 614         if (!image_buffer)
 615         {
 616                 printf("LoadTGA: not enough memory for %i by %i image\n", image_width, image_height);
 617                 return NULL;
 618         }
 619
 620         /* If bit 5 of attributes isn't set, the image has been stored from bottom to top */
 621         if ((targa_header.attributes & 0x20) == 0)
 622         {
 623                 pixbufi = (unsigned int*)image_buffer + (image_height - 1)*image_width;
 624                 row_inci = -image_width*2;
 625         }
 626         else
 627         {
 628                 pixbufi = (unsigned int*)image_buffer;
 629                 row_inci = 0;
 630         }
 631
 632         x = 0;
 633         y = 0;
 634         pix_inc = 1;
 635         if ((targa_header.image_type & ~8) == 2)
 636                 pix_inc = (targa_header.pixel_size + 7) / 8;
 637         switch (targa_header.image_type)
 638         {
 639         case 1: /* colormapped, uncompressed */
 640         case 3: /* greyscale, uncompressed */
 641                 if (fin + image_width * image_height * pix_inc > enddata)
 642                         break;
 643                 for (y = 0;y < image_height;y++, pixbufi += row_inci)
 644                         for (x = 0;x < image_width;x++)
 645                                 *pixbufi++ = palettei[*fin++];
 646                 break;
 647         case 2:
 648                 /* BGR or BGRA, uncompressed */
 649                 if (fin + image_width * image_height * pix_inc > enddata)
 650                         break;
 651                 if (targa_header.pixel_size == 32 && alphabits)
 652                 {
 653                         for (y = 0;y < image_height;y++)
 654                                 memcpy(pixbufi + y * (image_width + row_inci), fin + y * image_width * pix_inc, image_width*4);
 655                 }
 656                 else
 657                 {
 658                         for (y = 0;y < image_height;y++, pixbufi += row_inci)
 659                         {
 660                                 for (x = 0;x < image_width;x++, fin += pix_inc)
 661                                 {
 662                                         bgra.b[0] = fin[0];
 663                                         bgra.b[1] = fin[1];
 664                                         bgra.b[2] = fin[2];
 665                                         bgra.b[3] = 255;
 666                                         *pixbufi++ = bgra.i;
 667                                 }
 668                         }
 669                 }
 670                 break;
 671         case 9: /* colormapped, RLE */
 672         case 11: /* greyscale, RLE */
 673                 for (y = 0;y < image_height;y++, pixbufi += row_inci)
 674                 {
 675                         for (x = 0;x < image_width;)
 676                         {
 677                                 if (fin >= enddata)
 678                                         break; /* error - truncated file */
 679                                 runlen = *fin++;
 680                                 if (runlen & 0x80)
 681                                 {
 682                                         /* RLE - all pixels the same color */
 683                                         runlen += 1 - 0x80;
 684                                         if (fin + pix_inc > enddata)
 685                                                 break; /* error - truncated file */
 686                                         if (x + runlen > image_width)
 687                                                 break; /* error - line exceeds width */
 688                                         bgra.i = palettei[*fin++];
 689                                         for (;runlen--;x++)
 690                                                 *pixbufi++ = bgra.i;
 691                                 }
 692                                 else
 693                                 {
 694                                         /* uncompressed - all pixels different color */
 695                                         runlen++;
 696                                         if (fin + pix_inc * runlen > enddata)
 697                                                 break; /* error - truncated file */
 698                                         if (x + runlen > image_width)
 699                                                 break; /* error - line exceeds width */
 700                                         for (;runlen--;x++)
 701                                                 *pixbufi++ = palettei[*fin++];
 702                                 }
 703                         }
 704
 705                         if (x != image_width)
 706                         {
 707                                 /* pixbufi is useless now */
 708                                 printf("LoadTGA: corrupt file\n");
 709                                 break;
 710                         }
 711                 }
 712                 break;
 713         case 10:
 714                 /* BGR or BGRA, RLE */
 715                 if (targa_header.pixel_size == 32 && alphabits)
 716                 {
 717                         for (y = 0;y < image_height;y++, pixbufi += row_inci)
 718                         {
 719                                 for (x = 0;x < image_width;)
 720                                 {
 721                                         if (fin >= enddata)
 722                                                 break; /* error - truncated file */
 723                                         runlen = *fin++;
 724                                         if (runlen & 0x80)
 725                                         {
 726                                                 /* RLE - all pixels the same color */
 727                                                 runlen += 1 - 0x80;
 728                                                 if (fin + pix_inc > enddata)
 729                                                         break; /* error - truncated file */
 730                                                 if (x + runlen > image_width)
 731                                                         break; /* error - line exceeds width */
 732                                                 bgra.b[0] = fin[0];
 733                                                 bgra.b[1] = fin[1];
 734                                                 bgra.b[2] = fin[2];
 735                                                 bgra.b[3] = fin[3];
 736                                                 fin += pix_inc;
 737                                                 for (;runlen--;x++)
 738                                                         *pixbufi++ = bgra.i;
 739                                         }
 740                                         else
 741                                         {
 742                                                 /* uncompressed - all pixels different color */
 743                                                 runlen++;
 744                                                 if (fin + pix_inc * runlen > enddata)
 745                                                         break; /* error - truncated file */
 746                                                 if (x + runlen > image_width)
 747                                                         break; /* error - line exceeds width */
 748                                                 for (;runlen--;x++)
 749                                                 {
 750                                                         bgra.b[0] = fin[0];
 751                                                         bgra.b[1] = fin[1];
 752                                                         bgra.b[2] = fin[2];
 753                                                         bgra.b[3] = fin[3];
 754                                                         fin += pix_inc;
 755                                                         *pixbufi++ = bgra.i;
 756                                                 }
 757                                         }
 758                                 }
 759
 760                                 if (x != image_width)
 761                                 {
 762                                         /* pixbufi is useless now */
 763                                         printf("LoadTGA: corrupt file\n");
 764                                         break;
 765                                 }
 766                         }
 767                 }
 768                 else
 769                 {
 770                         for (y = 0;y < image_height;y++, pixbufi += row_inci)
 771                         {
 772                                 for (x = 0;x < image_width;)
 773                                 {
 774                                         if (fin >= enddata)
 775                                                 break; /* error - truncated file */
 776                                         runlen = *fin++;
 777                                         if (runlen & 0x80)
 778                                         {
 779                                                 /* RLE - all pixels the same color */
 780                                                 runlen += 1 - 0x80;
 781                                                 if (fin + pix_inc > enddata)
 782                                                         break; /* error - truncated file */
 783                                                 if (x + runlen > image_width)
 784                                                         break; /* error - line exceeds width */
 785                                                 bgra.b[0] = fin[0];
 786                                                 bgra.b[1] = fin[1];
 787                                                 bgra.b[2] = fin[2];
 788                                                 bgra.b[3] = 255;
 789                                                 fin += pix_inc;
 790                                                 for (;runlen--;x++)
 791                                                         *pixbufi++ = bgra.i;
 792                                         }
 793                                         else
 794                                         {
 795                                                 /* uncompressed - all pixels different color */
 796                                                 runlen++;
 797                                                 if (fin + pix_inc * runlen > enddata)
 798                                                         break; /* error - truncated file */
 799                                                 if (x + runlen > image_width)
 800                                                         break; /* error - line exceeds width */
 801                                                 for (;runlen--;x++)
 802                                                 {
 803                                                         bgra.b[0] = fin[0];
 804                                                         bgra.b[1] = fin[1];
 805                                                         bgra.b[2] = fin[2];
 806                                                         bgra.b[3] = 255;
 807                                                         fin += pix_inc;
 808                                                         *pixbufi++ = bgra.i;
 809                                                 }
 810                                         }
 811                                 }
 812
 813                                 if (x != image_width)
 814                                 {
 815                                         /* pixbufi is useless now */
 816                                         printf("LoadTGA: corrupt file\n");
 817                                         break;
 818                                 }
 819                         }
 820                 }
 821                 break;
 822         default:
 823                 /* unknown image_type */
 824                 break;
 825         }
 826
 827         return image_buffer;
 828 }
 829
 830 int Image_WriteTGABGRA (const char *filename, int width, int height, const unsigned char *data)
 831 {
 832         int y;
 833         unsigned char *buffer, *out;
 834         const unsigned char *in, *end;
 835         int ret;
 836
 837         buffer = (unsigned char *)malloc(width*height*4 + 18);
 838
 839         memset (buffer, 0, 18);
 840         buffer[2] = 2;          /* uncompressed type */
 841         buffer[12] = (width >> 0) & 0xFF;
 842         buffer[13] = (width >> 8) & 0xFF;
 843         buffer[14] = (height >> 0) & 0xFF;
 844         buffer[15] = (height >> 8) & 0xFF;
 845
 846         for (y = 3;y < width*height*4;y += 4)
 847                 if (data[y] < 255)
 848                         break;
 849
 850         if (y < width*height*4)
 851         {
 852                 /* save the alpha channel */
 853                 buffer[16] = 32;        /* pixel size */
 854                 buffer[17] = 8; /* 8 bits of alpha */
 855
 856                 /* flip upside down */
 857                 out = buffer + 18;
 858                 for (y = height - 1;y >= 0;y--)
 859                 {
 860                         memcpy(out, data + y * width * 4, width * 4);
 861                         out += width*4;
 862                 }
 863         }
 864         else
 865         {
 866                 /* save only the color channels */
 867                 buffer[16] = 24;        /* pixel size */
 868                 buffer[17] = 0; /* 8 bits of alpha */
 869
 870                 /* truncate bgra to bgr and flip upside down */
 871                 out = buffer + 18;
 872                 for (y = height - 1;y >= 0;y--)
 873                 {
 874                         in = data + y * width * 4;
 875                         end = in + width * 4;
 876                         for (;in < end;in += 4)
 877                         {
 878                                 *out++ = in[0];
 879                                 *out++ = in[1];
 880                                 *out++ = in[2];
 881                         }
 882                 }
 883         }
 884         ret = FS_WriteFile (filename, buffer, out - buffer);
 885
 886         free(buffer);
 887
 888         return ret;
 889 }
 890 /* START stuff that originates from image.c in DarkPlaces */
 891
 892 int usage(const char *me)
 893 {
 894         printf("Usage: %s <infile_norm.tga> <outfile_normandheight.tga> [<scale> [<offset> [<infile_ref.tga>]]] (get heightmap from normalmap)\n", me);
 895         printf("or:    %s <infile_height.tga> <outfile_normandheight.tga> -1 [<scale>] (read from B, Diff)\n", me);
 896         printf("or:    %s <infile_height.tga> <outfile_normandheight.tga> -2 [<scale>] (read from G, Diff)\n", me);
 897         printf("or:    %s <infile_height.tga> <outfile_normandheight.tga> -3 [<scale>] (read from R, Diff)\n", me);
 898         printf("or:    %s <infile_height.tga> <outfile_normandheight.tga> -4 [<scale>] (read from A, Diff)\n", me);
 899         printf("or:    %s <infile_height.tga> <outfile_normandheight.tga> -5 [<scale>] (read from (R+G+B)/3, Diff)\n", me);
 900         printf("or:    %s <infile_height.tga> <outfile_normandheight.tga> -6 [<scale>] (read from Y, Diff)\n", me);
 901         printf("or:    %s <infile_height.tga> <outfile_normandheight.tga> -7 [<scale>] (read from B, FFT)\n", me);
 902         printf("or:    %s <infile_height.tga> <outfile_normandheight.tga> -8 [<scale>] (read from G, FFT)\n", me);
 903         printf("or:    %s <infile_height.tga> <outfile_normandheight.tga> -9 [<scale>] (read from R, FFT)\n", me);
 904         printf("or:    %s <infile_height.tga> <outfile_normandheight.tga> -10 [<scale>] (read from A, FFT)\n", me);
 905         printf("or:    %s <infile_height.tga> <outfile_normandheight.tga> -11 [<scale>] (read from (R+G+B)/3, FFT)\n", me);
 906         printf("or:    %s <infile_height.tga> <outfile_normandheight.tga> -12 [<scale>] (read from Y, FFT)\n", me);
 907         return 1;
 908 }
 909
 910 int main(int argc, char **argv)
 911 {
 912         const char *infile, *outfile, *reffile;
 913         double scale, offset;
 914         int nmaplen, w, h;
 915         unsigned char *nmapdata, *nmap, *refmap;
 916
 917         if(argc > 1)
 918                 infile = argv[1];
 919         else
 920                 return usage(*argv);
 921
 922         if(argc > 2)
 923                 outfile = argv[2];
 924         else
 925                 return usage(*argv);
 926
 927         if(argc > 3)
 928                 scale = atof(argv[3]);
 929         else
 930                 scale = 0;
 931
 932         if(argc > 4)
 933                 offset = atof(argv[4]);
 934         else
 935                 offset = (scale<0) ? 1 : 0;
 936
 937         if(argc > 5)
 938                 reffile = argv[5];
 939         else
 940                 reffile = NULL;
 941
 942         nmapdata = FS_LoadFile(infile, &nmaplen);
 943         if(!nmapdata)
 944         {
 945                 printf("FS_LoadFile failed\n");
 946                 return 2;
 947         }
 948         nmap = LoadTGA_BGRA(nmapdata, nmaplen);
 949         free(nmapdata);
 950         if(!nmap)
 951         {
 952                 printf("LoadTGA_BGRA failed\n");
 953                 return 2;
 954         }
 955         w = image_width;
 956         h = image_height;
 957
 958         if(reffile)
 959         {
 960                 nmapdata = FS_LoadFile(reffile, &nmaplen);
 961                 if(!nmapdata)
 962                 {
 963                         printf("FS_LoadFile failed\n");
 964                         return 2;
 965                 }
 966                 refmap = LoadTGA_BGRA(nmapdata, nmaplen);
 967                 free(nmapdata);
 968                 if(!refmap)
 969                 {
 970                         printf("LoadTGA_BGRA failed\n");
 971                         return 2;
 972                 }
 973                 if(image_width != w || image_height != h)
 974                 {
 975                         printf("reference map must have same size as input normalmap\n");
 976                         return 2;
 977                 }
 978         }
 979         else
 980                 refmap = NULL;
 981
 982         if(scale < -6)
 983                 hmap_to_nmap(nmap, image_width, image_height, -scale-7, offset);
 984         else if(scale < 0)
 985                 hmap_to_nmap_local(nmap, image_width, image_height, -scale-1, offset);
 986         else
 987                 nmap_to_hmap(nmap, refmap, image_width, image_height, scale, offset);
 988         if(!Image_WriteTGABGRA(outfile, image_width, image_height, nmap))
 989         {
 990                 printf("Image_WriteTGABGRA failed\n");
 991                 free(nmap);
 992                 return 2;
 993         }
 994         free(nmap);
 995         return 0;
 996 }