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         double 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                 /* it basically decides how artifacts are distributed */
  99                 ffx = fx;
 100                 ffy = fy;
 101 #ifdef C99
 102                 if(fx||fy)
 103                         freqspace1[(w*y+x)] = _Complex_I * (ffx * freqspace1[(w*y+x)] + ffy * freqspace2[(w*y+x)]) / (ffx*fx + ffy*fy) / TWO_PI;
 104                 else
 105                         freqspace1[(w*y+x)] = 0;
 106 #else
 107                 if(fx||fy)
 108                 {
 109                         save = freqspace1[(w*y+x)][0];
 110                         freqspace1[(w*y+x)][0] = -(ffx * freqspace1[(w*y+x)][1] + ffy * freqspace2[(w*y+x)][1]) / (ffx*fx + ffy*fy) / TWO_PI;
 111                         freqspace1[(w*y+x)][1] =  (ffx * save + ffy * freqspace2[(w*y+x)][0]) / (ffx*fx + ffy*fy) / TWO_PI;
 112                 }
 113                 else
 114                 {
 115                         freqspace1[(w*y+x)][0] = 0;
 116                         freqspace1[(w*y+x)][1] = 0;
 117                 }
 118 #endif
 119         }
 120
 121         fftw_execute(f12i1);
 122
 123         /* renormalize, find min/max */
 124         vmin = vmax = 0;
 125         for(y = 0; y < h; ++y)
 126         for(x = 0; x < w; ++x)
 127         {
 128 #ifdef C99
 129                 v = creal(imgspace1[(w*y+x)] /= (w*h));
 130 #else
 131                 v = (imgspace1[(w*y+x)][0] /= (w*h));
 132                 imgspace1[(w*y+x)][1] /= (w*h);
 133 #endif
 134                 if(v < vmin || (x == 0 && y == 0))
 135                         vmin = v;
 136                 if(v > vmax || (x == 0 && y == 0))
 137                         vmax = v;
 138         }
 139
 140         if(refmap)
 141         {
 142                 double f, a;
 143                 double o, s;
 144                 double sa, sfa, sffa, sfva, sva;
 145                 double mi, ma;
 146                 sa = sfa = sffa = sfva = sva = 0;
 147                 mi = 1;
 148                 ma = -1;
 149                 for(y = 0; y < h; ++y)
 150                 for(x = 0; x < w; ++x)
 151                 {
 152                         a = (int)refmap[(w*y+x)*4+3];
 153                         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);
 154                         v = (v - 128.0) / 127.0;
 155 #ifdef C99
 156                         f = creal(imgspace1[(w*y+x)]);
 157 #else
 158                         f = imgspace1[(w*y+x)][0];
 159 #endif
 160                         if(a <= 0)
 161                                 continue;
 162                         if(v < mi)
 163                                 mi = v;
 164                         if(v > ma)
 165                                 ma = v;
 166                         sa += a;
 167                         sfa += f*a;
 168                         sffa += f*f*a;
 169                         sfva += f*v*a;
 170                         sva += v*a;
 171                 }
 172                 if(mi < ma)
 173                 {
 174                         /* linear regression ftw */
 175                         o = (sfa*sfva - sffa*sva) / (sfa*sfa-sa*sffa);
 176                         s = (sfa*sva - sa*sfva) / (sfa*sfa-sa*sffa);
 177                 }
 178                 else /* all values of v are equal, so we cannot get scale; we can still get offset */
 179                 {
 180                         o = ((sva - sfa) / sa);
 181                         s = 1;
 182                 }
 183
 184                 /*
 185                  * now apply user-given offset and scale to these values
 186                  * (x * s + o) * scale + offset
 187                  * x * s * scale + o * scale + offset
 188                  */
 189                 offset += o * scale;
 190                 scale *= s;
 191         }
 192         else if(scale == 0)
 193         {
 194                 /*
 195                  * map vmin to -1
 196                  * map vmax to +1
 197                  */
 198                 scale = 2 / (vmax - vmin);
 199                 offset = -(vmax + vmin) / (vmax - vmin);
 200         }
 201
 202         printf("Min: %f\nAvg: %f\nMax: %f\nScale: %f\nOffset: %f\nScaled-Min: %f\nScaled-Avg: %f\nScaled-Max: %f\n",
 203                 vmin, 0.0, vmax, scale, offset, vmin * scale + offset, offset, vmax * scale + offset);
 204
 205         for(y = 0; y < h; ++y)
 206         for(x = 0; x < w; ++x)
 207         {
 208 #ifdef C99
 209                 v = creal(imgspace1[(w*y+x)]);
 210 #else
 211                 v = imgspace1[(w*y+x)][0];
 212 #endif
 213                 v = v * scale + offset;
 214                 if(v < -1)
 215                         v = -1;
 216                 if(v > 1)
 217                         v = 1;
 218                 map[(w*y+x)*4+3] = floor(128.5 + 127 * v);
 219         }
 220
 221         fftw_destroy_plan(i12f1);
 222         fftw_destroy_plan(i22f2);
 223         fftw_destroy_plan(f12i1);
 224
 225         fftw_free(freqspace2);
 226         fftw_free(freqspace1);
 227         fftw_free(imgspace2);
 228         fftw_free(imgspace1);
 229 }
 230
 231 void hmap_to_nmap(unsigned char *map, int w, int h, int src_chan, double scale)
 232 {
 233         int x, y;
 234         double nx, ny, nz;
 235         double v;
 236 #ifndef C99
 237         double save;
 238 #endif
 239
 240         fftw_complex *imgspace1 = fftw_malloc(w*h * sizeof(fftw_complex));
 241         fftw_complex *imgspace2 = fftw_malloc(w*h * sizeof(fftw_complex));
 242         fftw_complex *freqspace1 = fftw_malloc(w*h * sizeof(fftw_complex));
 243         fftw_complex *freqspace2 = fftw_malloc(w*h * sizeof(fftw_complex));
 244         fftw_plan i12f1 = fftw_plan_dft_2d(h, w, imgspace1, freqspace1, FFTW_FORWARD, FFTW_ESTIMATE);
 245         fftw_plan f12i1 = fftw_plan_dft_2d(h, w, freqspace1, imgspace1, FFTW_BACKWARD, FFTW_ESTIMATE);
 246         fftw_plan f22i2 = fftw_plan_dft_2d(h, w, freqspace2, imgspace2, FFTW_BACKWARD, FFTW_ESTIMATE);
 247
 248         for(y = 0; y < h; ++y)
 249         for(x = 0; x < w; ++x)
 250         {
 251                 switch(src_chan)
 252                 {
 253                         case 0:
 254                         case 1:
 255                         case 2:
 256                         case 3:
 257                                 v = map[(w*y+x)*4+src_chan];
 258                                 break;
 259                         case 4:
 260                                 v = (map[(w*y+x)*4+0] + map[(w*y+x)*4+1] + map[(w*y+x)*4+2]) / 3;
 261                                 break;
 262                         default:
 263                         case 5:
 264                                 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);
 265                                 break;
 266                 }
 267 #ifdef C99
 268                 imgspace1[(w*y+x)] = (v - 128.0) / 127.0;
 269 #else
 270                 imgspace1[(w*y+x)][0] = (v - 128.0) / 127.0;
 271                 imgspace1[(w*y+x)][1] = 0;
 272 #endif
 273                 map[(w*y+x)*4+3] = floor(v + 0.5);
 274         }
 275
 276         /* see http://www.gamedev.net/community/forums/topic.asp?topic_id=561430 */
 277
 278         fftw_execute(i12f1);
 279
 280         for(y = 0; y < h; ++y)
 281         for(x = 0; x < w; ++x)
 282         {
 283                 int fx = x;
 284                 int fy = y;
 285                 if(fx > w/2)
 286                         fx -= w;
 287                 if(fy > h/2)
 288                         fy -= h;
 289 #ifdef C99
 290                 /* a lowpass to prevent the worst */
 291                 freqspace1[(w*y+x)] *= 1 - pow(abs(fx) / (double)(w/2), 1);
 292                 freqspace1[(w*y+x)] *= 1 - pow(abs(fy) / (double)(h/2), 1);
 293
 294                 freqspace2[(w*y+x)] = TWO_PI*_Complex_I * fy * freqspace1[(w*y+x)]; /* y derivative */
 295                 freqspace1[(w*y+x)] = TWO_PI*_Complex_I * fx * freqspace1[(w*y+x)]; /* x derivative */
 296 #else
 297                 /* a lowpass to prevent the worst */
 298                 freqspace1[(w*y+x)][0] *= 1 - pow(abs(fx) / (double)(w/2), 1);
 299                 freqspace1[(w*y+x)][1] *= 1 - pow(abs(fx) / (double)(w/2), 1);
 300                 freqspace1[(w*y+x)][0] *= 1 - pow(abs(fy) / (double)(h/2), 1);
 301                 freqspace1[(w*y+x)][1] *= 1 - pow(abs(fy) / (double)(h/2), 1);
 302
 303                 freqspace2[(w*y+x)][0] = -TWO_PI * fy * freqspace1[(w*y+x)][1]; /* y derivative */
 304                 freqspace2[(w*y+x)][1] =  TWO_PI * fy * freqspace1[(w*y+x)][0];
 305                 save = freqspace1[(w*y+x)][0];
 306                 freqspace1[(w*y+x)][0] = -TWO_PI * fx * freqspace1[(w*y+x)][1]; /* x derivative */
 307                 freqspace1[(w*y+x)][1] =  TWO_PI * fx * save;
 308 #endif
 309         }
 310
 311         fftw_execute(f12i1);
 312         fftw_execute(f22i2);
 313
 314         scale /= (w*h);
 315
 316         for(y = 0; y < h; ++y)
 317         for(x = 0; x < w; ++x)
 318         {
 319 #ifdef C99
 320                 nx = creal(imgspace1[(w*y+x)]);
 321                 ny = creal(imgspace2[(w*y+x)]);
 322 #else
 323                 nx = imgspace1[(w*y+x)][0];
 324                 ny = imgspace2[(w*y+x)][0];
 325 #endif
 326                 nx /= w;
 327                 ny /= h;
 328                 nz = -1 / scale;
 329                 v = -sqrt(nx*nx + ny*ny + nz*nz);
 330                 nx /= v;
 331                 ny /= v;
 332                 nz /= v;
 333                 ny = -ny; /* DP inverted normals */
 334                 map[(w*y+x)*4+2] = floor(128 + 127.5 * nx);
 335                 map[(w*y+x)*4+1] = floor(128 + 127.5 * ny);
 336                 map[(w*y+x)*4+0] = floor(128 + 127.5 * nz);
 337         }
 338
 339         fftw_destroy_plan(i12f1);
 340         fftw_destroy_plan(f12i1);
 341         fftw_destroy_plan(f22i2);
 342
 343         fftw_free(freqspace2);
 344         fftw_free(freqspace1);
 345         fftw_free(imgspace2);
 346         fftw_free(imgspace1);
 347 }
 348
 349 void hmap_to_nmap_local(unsigned char *map, int w, int h, int src_chan, double scale)
 350 {
 351         int x, y;
 352         double nx, ny, nz;
 353         double v;
 354         int i, j;
 355         double *img_reduced = malloc(w*h * sizeof(double));
 356         static const double filter[3][3] = { /* filter to derive one component */
 357                 {  -3, 0,  3 },
 358                 { -10, 0, 10 },
 359                 {  -3, 0,  3 }
 360         };
 361         static const double filter_mult = 0.03125;
 362
 363         for(y = 0; y < h; ++y)
 364         for(x = 0; x < w; ++x)
 365         {
 366                 switch(src_chan)
 367                 {
 368                         case 0:
 369                         case 1:
 370                         case 2:
 371                         case 3:
 372                                 v = map[(w*y+x)*4+src_chan];
 373                                 break;
 374                         case 4:
 375                                 v = (map[(w*y+x)*4+0] + map[(w*y+x)*4+1] + map[(w*y+x)*4+2]) / 3;
 376                                 break;
 377                         default:
 378                         case 5:
 379                                 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);
 380                                 break;
 381                 }
 382                 img_reduced[(w*y+x)] = (v - 128.0) / 127.0;
 383                 map[(w*y+x)*4+3] = floor(v + 0.5);
 384         }
 385
 386         for(y = 0; y < h; ++y)
 387         for(x = 0; x < w; ++x)
 388         {
 389                 nz = -1 / (scale * filter_mult);
 390                 nx = ny = 0;
 391
 392                 for(i = -(int)(sizeof(filter) / sizeof(*filter)) / 2; i <= (int)(sizeof(filter) / sizeof(*filter)) / 2; ++i)
 393                         for(j = -(int)(sizeof(*filter) / sizeof(**filter)) / 2; j <= (int)(sizeof(*filter) / sizeof(**filter)) / 2; ++j)
 394                         {
 395                                 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];
 396                                 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];
 397                         }
 398
 399                 v = -sqrt(nx*nx + ny*ny + nz*nz);
 400                 nx /= v;
 401                 ny /= v;
 402                 nz /= v;
 403                 ny = -ny; /* DP inverted normals */
 404                 map[(w*y+x)*4+2] = floor(128 + 127.5 * nx);
 405                 map[(w*y+x)*4+1] = floor(128 + 127.5 * ny);
 406                 map[(w*y+x)*4+0] = floor(128 + 127.5 * nz);
 407         }
 408
 409         free(img_reduced);
 410 }
 411
 412 unsigned char *FS_LoadFile(const char *fn, int *len)
 413 {
 414         unsigned char *buf = NULL;
 415         int n;
 416         FILE *f = fopen(fn, "rb");
 417         *len = 0;
 418         if(!f)
 419                 return NULL;
 420         for(;;)
 421         {
 422                 buf = realloc(buf, *len + 65536);
 423                 if(!buf)
 424                 {
 425                         fclose(f);
 426                         free(buf);
 427                         *len = 0;
 428                         return NULL;
 429                 }
 430                 n = fread(buf + *len, 1, 65536, f);
 431                 if(n < 0)
 432                 {
 433                         fclose(f);
 434                         free(buf);
 435                         *len = 0;
 436                         return NULL;
 437                 }
 438                 *len += n;
 439                 if(n < 65536)
 440                         break;
 441         }
 442         return buf;
 443 }
 444
 445 int FS_WriteFile(const char *fn, unsigned char *data, int len)
 446 {
 447         FILE *f = fopen(fn, "wb");
 448         if(!f)
 449                 return 0;
 450         if(fwrite(data, len, 1, f) != 1)
 451         {
 452                 fclose(f);
 453                 return 0;
 454         }
 455         if(fclose(f))
 456                 return 0;
 457         return 1;
 458 }
 459
 460 /* START stuff that originates from image.c in DarkPlaces */
 461 int image_width, image_height;
 462
 463 typedef struct _TargaHeader
 464 {
 465         unsigned char   id_length, colormap_type, image_type;
 466         unsigned short  colormap_index, colormap_length;
 467         unsigned char   colormap_size;
 468         unsigned short  x_origin, y_origin, width, height;
 469         unsigned char   pixel_size, attributes;
 470 }
 471 TargaHeader;
 472
 473 void PrintTargaHeader(TargaHeader *t)
 474 {
 475         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);
 476 }
 477
 478 unsigned char *LoadTGA_BGRA (const unsigned char *f, int filesize)
 479 {
 480         int x, y, pix_inc, row_inci, runlen, alphabits;
 481         unsigned char *image_buffer;
 482         unsigned int *pixbufi;
 483         const unsigned char *fin, *enddata;
 484         TargaHeader targa_header;
 485         unsigned int palettei[256];
 486         union
 487         {
 488                 unsigned int i;
 489                 unsigned char b[4];
 490         }
 491         bgra;
 492
 493         if (filesize < 19)
 494                 return NULL;
 495
 496         enddata = f + filesize;
 497
 498         targa_header.id_length = f[0];
 499         targa_header.colormap_type = f[1];
 500         targa_header.image_type = f[2];
 501
 502         targa_header.colormap_index = f[3] + f[4] * 256;
 503         targa_header.colormap_length = f[5] + f[6] * 256;
 504         targa_header.colormap_size = f[7];
 505         targa_header.x_origin = f[8] + f[9] * 256;
 506         targa_header.y_origin = f[10] + f[11] * 256;
 507         targa_header.width = image_width = f[12] + f[13] * 256;
 508         targa_header.height = image_height = f[14] + f[15] * 256;
 509         targa_header.pixel_size = f[16];
 510         targa_header.attributes = f[17];
 511
 512         if (image_width > 32768 || image_height > 32768 || image_width <= 0 || image_height <= 0)
 513         {
 514                 printf("LoadTGA: invalid size\n");
 515                 PrintTargaHeader(&targa_header);
 516                 return NULL;
 517         }
 518
 519         /* advance to end of header */
 520         fin = f + 18;
 521
 522         /* skip TARGA image comment (usually 0 bytes) */
 523         fin += targa_header.id_length;
 524
 525         /* read/skip the colormap if present (note: according to the TARGA spec it */
 526         /* can be present even on 1color or greyscale images, just not used by */
 527         /* the image data) */
 528         if (targa_header.colormap_type)
 529         {
 530                 if (targa_header.colormap_length > 256)
 531                 {
 532                         printf("LoadTGA: only up to 256 colormap_length supported\n");
 533                         PrintTargaHeader(&targa_header);
 534                         return NULL;
 535                 }
 536                 if (targa_header.colormap_index)
 537                 {
 538                         printf("LoadTGA: colormap_index not supported\n");
 539                         PrintTargaHeader(&targa_header);
 540                         return NULL;
 541                 }
 542                 if (targa_header.colormap_size == 24)
 543                 {
 544                         for (x = 0;x < targa_header.colormap_length;x++)
 545                         {
 546                                 bgra.b[0] = *fin++;
 547                                 bgra.b[1] = *fin++;
 548                                 bgra.b[2] = *fin++;
 549                                 bgra.b[3] = 255;
 550                                 palettei[x] = bgra.i;
 551                         }
 552                 }
 553                 else if (targa_header.colormap_size == 32)
 554                 {
 555                         memcpy(palettei, fin, targa_header.colormap_length*4);
 556                         fin += targa_header.colormap_length * 4;
 557                 }
 558                 else
 559                 {
 560                         printf("LoadTGA: Only 32 and 24 bit colormap_size supported\n");
 561                         PrintTargaHeader(&targa_header);
 562                         return NULL;
 563                 }
 564         }
 565
 566         /* check our pixel_size restrictions according to image_type */
 567         switch (targa_header.image_type & ~8)
 568         {
 569         case 2:
 570                 if (targa_header.pixel_size != 24 && targa_header.pixel_size != 32)
 571                 {
 572                         printf("LoadTGA: only 24bit and 32bit pixel sizes supported for type 2 and type 10 images\n");
 573                         PrintTargaHeader(&targa_header);
 574                         return NULL;
 575                 }
 576                 break;
 577         case 3:
 578                 /* set up a palette to make the loader easier */
 579                 for (x = 0;x < 256;x++)
 580                 {
 581                         bgra.b[0] = bgra.b[1] = bgra.b[2] = x;
 582                         bgra.b[3] = 255;
 583                         palettei[x] = bgra.i;
 584                 }
 585                 /* fall through to colormap case */
 586         case 1:
 587                 if (targa_header.pixel_size != 8)
 588                 {
 589                         printf("LoadTGA: only 8bit pixel size for type 1, 3, 9, and 11 images supported\n");
 590                         PrintTargaHeader(&targa_header);
 591                         return NULL;
 592                 }
 593                 break;
 594         default:
 595                 printf("LoadTGA: Only type 1, 2, 3, 9, 10, and 11 targa RGB images supported, image_type = %i\n", targa_header.image_type);
 596                 PrintTargaHeader(&targa_header);
 597                 return NULL;
 598         }
 599
 600         if (targa_header.attributes & 0x10)
 601         {
 602                 printf("LoadTGA: origin must be in top left or bottom left, top right and bottom right are not supported\n");
 603                 return NULL;
 604         }
 605
 606         /* number of attribute bits per pixel, we only support 0 or 8 */
 607         alphabits = targa_header.attributes & 0x0F;
 608         if (alphabits != 8 && alphabits != 0)
 609         {
 610                 printf("LoadTGA: only 0 or 8 attribute (alpha) bits supported\n");
 611                 return NULL;
 612         }
 613
 614         image_buffer = (unsigned char *)malloc(image_width * image_height * 4);
 615         if (!image_buffer)
 616         {
 617                 printf("LoadTGA: not enough memory for %i by %i image\n", image_width, image_height);
 618                 return NULL;
 619         }
 620
 621         /* If bit 5 of attributes isn't set, the image has been stored from bottom to top */
 622         if ((targa_header.attributes & 0x20) == 0)
 623         {
 624                 pixbufi = (unsigned int*)image_buffer + (image_height - 1)*image_width;
 625                 row_inci = -image_width*2;
 626         }
 627         else
 628         {
 629                 pixbufi = (unsigned int*)image_buffer;
 630                 row_inci = 0;
 631         }
 632
 633         x = 0;
 634         y = 0;
 635         pix_inc = 1;
 636         if ((targa_header.image_type & ~8) == 2)
 637                 pix_inc = (targa_header.pixel_size + 7) / 8;
 638         switch (targa_header.image_type)
 639         {
 640         case 1: /* colormapped, uncompressed */
 641         case 3: /* greyscale, uncompressed */
 642                 if (fin + image_width * image_height * pix_inc > enddata)
 643                         break;
 644                 for (y = 0;y < image_height;y++, pixbufi += row_inci)
 645                         for (x = 0;x < image_width;x++)
 646                                 *pixbufi++ = palettei[*fin++];
 647                 break;
 648         case 2:
 649                 /* BGR or BGRA, uncompressed */
 650                 if (fin + image_width * image_height * pix_inc > enddata)
 651                         break;
 652                 if (targa_header.pixel_size == 32 && alphabits)
 653                 {
 654                         for (y = 0;y < image_height;y++)
 655                                 memcpy(pixbufi + y * (image_width + row_inci), fin + y * image_width * pix_inc, image_width*4);
 656                 }
 657                 else
 658                 {
 659                         for (y = 0;y < image_height;y++, pixbufi += row_inci)
 660                         {
 661                                 for (x = 0;x < image_width;x++, fin += pix_inc)
 662                                 {
 663                                         bgra.b[0] = fin[0];
 664                                         bgra.b[1] = fin[1];
 665                                         bgra.b[2] = fin[2];
 666                                         bgra.b[3] = 255;
 667                                         *pixbufi++ = bgra.i;
 668                                 }
 669                         }
 670                 }
 671                 break;
 672         case 9: /* colormapped, RLE */
 673         case 11: /* greyscale, RLE */
 674                 for (y = 0;y < image_height;y++, pixbufi += row_inci)
 675                 {
 676                         for (x = 0;x < image_width;)
 677                         {
 678                                 if (fin >= enddata)
 679                                         break; /* error - truncated file */
 680                                 runlen = *fin++;
 681                                 if (runlen & 0x80)
 682                                 {
 683                                         /* RLE - all pixels the same color */
 684                                         runlen += 1 - 0x80;
 685                                         if (fin + pix_inc > enddata)
 686                                                 break; /* error - truncated file */
 687                                         if (x + runlen > image_width)
 688                                                 break; /* error - line exceeds width */
 689                                         bgra.i = palettei[*fin++];
 690                                         for (;runlen--;x++)
 691                                                 *pixbufi++ = bgra.i;
 692                                 }
 693                                 else
 694                                 {
 695                                         /* uncompressed - all pixels different color */
 696                                         runlen++;
 697                                         if (fin + pix_inc * runlen > enddata)
 698                                                 break; /* error - truncated file */
 699                                         if (x + runlen > image_width)
 700                                                 break; /* error - line exceeds width */
 701                                         for (;runlen--;x++)
 702                                                 *pixbufi++ = palettei[*fin++];
 703                                 }
 704                         }
 705
 706                         if (x != image_width)
 707                         {
 708                                 /* pixbufi is useless now */
 709                                 printf("LoadTGA: corrupt file\n");
 710                                 break;
 711                         }
 712                 }
 713                 break;
 714         case 10:
 715                 /* BGR or BGRA, RLE */
 716                 if (targa_header.pixel_size == 32 && alphabits)
 717                 {
 718                         for (y = 0;y < image_height;y++, pixbufi += row_inci)
 719                         {
 720                                 for (x = 0;x < image_width;)
 721                                 {
 722                                         if (fin >= enddata)
 723                                                 break; /* error - truncated file */
 724                                         runlen = *fin++;
 725                                         if (runlen & 0x80)
 726                                         {
 727                                                 /* RLE - all pixels the same color */
 728                                                 runlen += 1 - 0x80;
 729                                                 if (fin + pix_inc > enddata)
 730                                                         break; /* error - truncated file */
 731                                                 if (x + runlen > image_width)
 732                                                         break; /* error - line exceeds width */
 733                                                 bgra.b[0] = fin[0];
 734                                                 bgra.b[1] = fin[1];
 735                                                 bgra.b[2] = fin[2];
 736                                                 bgra.b[3] = fin[3];
 737                                                 fin += pix_inc;
 738                                                 for (;runlen--;x++)
 739                                                         *pixbufi++ = bgra.i;
 740                                         }
 741                                         else
 742                                         {
 743                                                 /* uncompressed - all pixels different color */
 744                                                 runlen++;
 745                                                 if (fin + pix_inc * runlen > enddata)
 746                                                         break; /* error - truncated file */
 747                                                 if (x + runlen > image_width)
 748                                                         break; /* error - line exceeds width */
 749                                                 for (;runlen--;x++)
 750                                                 {
 751                                                         bgra.b[0] = fin[0];
 752                                                         bgra.b[1] = fin[1];
 753                                                         bgra.b[2] = fin[2];
 754                                                         bgra.b[3] = fin[3];
 755                                                         fin += pix_inc;
 756                                                         *pixbufi++ = bgra.i;
 757                                                 }
 758                                         }
 759                                 }
 760
 761                                 if (x != image_width)
 762                                 {
 763                                         /* pixbufi is useless now */
 764                                         printf("LoadTGA: corrupt file\n");
 765                                         break;
 766                                 }
 767                         }
 768                 }
 769                 else
 770                 {
 771                         for (y = 0;y < image_height;y++, pixbufi += row_inci)
 772                         {
 773                                 for (x = 0;x < image_width;)
 774                                 {
 775                                         if (fin >= enddata)
 776                                                 break; /* error - truncated file */
 777                                         runlen = *fin++;
 778                                         if (runlen & 0x80)
 779                                         {
 780                                                 /* RLE - all pixels the same color */
 781                                                 runlen += 1 - 0x80;
 782                                                 if (fin + pix_inc > enddata)
 783                                                         break; /* error - truncated file */
 784                                                 if (x + runlen > image_width)
 785                                                         break; /* error - line exceeds width */
 786                                                 bgra.b[0] = fin[0];
 787                                                 bgra.b[1] = fin[1];
 788                                                 bgra.b[2] = fin[2];
 789                                                 bgra.b[3] = 255;
 790                                                 fin += pix_inc;
 791                                                 for (;runlen--;x++)
 792                                                         *pixbufi++ = bgra.i;
 793                                         }
 794                                         else
 795                                         {
 796                                                 /* uncompressed - all pixels different color */
 797                                                 runlen++;
 798                                                 if (fin + pix_inc * runlen > enddata)
 799                                                         break; /* error - truncated file */
 800                                                 if (x + runlen > image_width)
 801                                                         break; /* error - line exceeds width */
 802                                                 for (;runlen--;x++)
 803                                                 {
 804                                                         bgra.b[0] = fin[0];
 805                                                         bgra.b[1] = fin[1];
 806                                                         bgra.b[2] = fin[2];
 807                                                         bgra.b[3] = 255;
 808                                                         fin += pix_inc;
 809                                                         *pixbufi++ = bgra.i;
 810                                                 }
 811                                         }
 812                                 }
 813
 814                                 if (x != image_width)
 815                                 {
 816                                         /* pixbufi is useless now */
 817                                         printf("LoadTGA: corrupt file\n");
 818                                         break;
 819                                 }
 820                         }
 821                 }
 822                 break;
 823         default:
 824                 /* unknown image_type */
 825                 break;
 826         }
 827
 828         return image_buffer;
 829 }
 830
 831 int Image_WriteTGABGRA (const char *filename, int width, int height, const unsigned char *data)
 832 {
 833         int y;
 834         unsigned char *buffer, *out;
 835         const unsigned char *in, *end;
 836         int ret;
 837
 838         buffer = (unsigned char *)malloc(width*height*4 + 18);
 839
 840         memset (buffer, 0, 18);
 841         buffer[2] = 2;          /* uncompressed type */
 842         buffer[12] = (width >> 0) & 0xFF;
 843         buffer[13] = (width >> 8) & 0xFF;
 844         buffer[14] = (height >> 0) & 0xFF;
 845         buffer[15] = (height >> 8) & 0xFF;
 846
 847         for (y = 3;y < width*height*4;y += 4)
 848                 if (data[y] < 255)
 849                         break;
 850
 851         if (y < width*height*4)
 852         {
 853                 /* save the alpha channel */
 854                 buffer[16] = 32;        /* pixel size */
 855                 buffer[17] = 8; /* 8 bits of alpha */
 856
 857                 /* flip upside down */
 858                 out = buffer + 18;
 859                 for (y = height - 1;y >= 0;y--)
 860                 {
 861                         memcpy(out, data + y * width * 4, width * 4);
 862                         out += width*4;
 863                 }
 864         }
 865         else
 866         {
 867                 /* save only the color channels */
 868                 buffer[16] = 24;        /* pixel size */
 869                 buffer[17] = 0; /* 8 bits of alpha */
 870
 871                 /* truncate bgra to bgr and flip upside down */
 872                 out = buffer + 18;
 873                 for (y = height - 1;y >= 0;y--)
 874                 {
 875                         in = data + y * width * 4;
 876                         end = in + width * 4;
 877                         for (;in < end;in += 4)
 878                         {
 879                                 *out++ = in[0];
 880                                 *out++ = in[1];
 881                                 *out++ = in[2];
 882                         }
 883                 }
 884         }
 885         ret = FS_WriteFile (filename, buffer, out - buffer);
 886
 887         free(buffer);
 888
 889         return ret;
 890 }
 891 /* START stuff that originates from image.c in DarkPlaces */
 892
 893 int usage(const char *me)
 894 {
 895         printf("Usage: %s <infile_norm.tga> <outfile_normandheight.tga> [<scale> [<offset> [<infile_ref.tga>]]] (get heightmap from normalmap)\n", me);
 896         printf("or:    %s <infile_height.tga> <outfile_normandheight.tga> -1 [<scale>] (read from B, Diff)\n", me);
 897         printf("or:    %s <infile_height.tga> <outfile_normandheight.tga> -2 [<scale>] (read from G, Diff)\n", me);
 898         printf("or:    %s <infile_height.tga> <outfile_normandheight.tga> -3 [<scale>] (read from R, Diff)\n", me);
 899         printf("or:    %s <infile_height.tga> <outfile_normandheight.tga> -4 [<scale>] (read from A, Diff)\n", me);
 900         printf("or:    %s <infile_height.tga> <outfile_normandheight.tga> -5 [<scale>] (read from (R+G+B)/3, Diff)\n", me);
 901         printf("or:    %s <infile_height.tga> <outfile_normandheight.tga> -6 [<scale>] (read from Y, Diff)\n", me);
 902         printf("or:    %s <infile_height.tga> <outfile_normandheight.tga> -7 [<scale>] (read from B, FFT)\n", me);
 903         printf("or:    %s <infile_height.tga> <outfile_normandheight.tga> -8 [<scale>] (read from G, FFT)\n", me);
 904         printf("or:    %s <infile_height.tga> <outfile_normandheight.tga> -9 [<scale>] (read from R, FFT)\n", me);
 905         printf("or:    %s <infile_height.tga> <outfile_normandheight.tga> -10 [<scale>] (read from A, FFT)\n", me);
 906         printf("or:    %s <infile_height.tga> <outfile_normandheight.tga> -11 [<scale>] (read from (R+G+B)/3, FFT)\n", me);
 907         printf("or:    %s <infile_height.tga> <outfile_normandheight.tga> -12 [<scale>] (read from Y, FFT)\n", me);
 908         return 1;
 909 }
 910
 911 int main(int argc, char **argv)
 912 {
 913         const char *infile, *outfile, *reffile;
 914         double scale, offset;
 915         int nmaplen, w, h;
 916         unsigned char *nmapdata, *nmap, *refmap;
 917
 918         if(argc > 1)
 919                 infile = argv[1];
 920         else
 921                 return usage(*argv);
 922
 923         if(argc > 2)
 924                 outfile = argv[2];
 925         else
 926                 return usage(*argv);
 927
 928         if(argc > 3)
 929                 scale = atof(argv[3]);
 930         else
 931                 scale = 0;
 932
 933         if(argc > 4)
 934                 offset = atof(argv[4]);
 935         else
 936                 offset = (scale<0) ? 1 : 0;
 937
 938         if(argc > 5)
 939                 reffile = argv[5];
 940         else
 941                 reffile = NULL;
 942
 943         nmapdata = FS_LoadFile(infile, &nmaplen);
 944         if(!nmapdata)
 945         {
 946                 printf("FS_LoadFile failed\n");
 947                 return 2;
 948         }
 949         nmap = LoadTGA_BGRA(nmapdata, nmaplen);
 950         free(nmapdata);
 951         if(!nmap)
 952         {
 953                 printf("LoadTGA_BGRA failed\n");
 954                 return 2;
 955         }
 956         w = image_width;
 957         h = image_height;
 958
 959         if(reffile)
 960         {
 961                 nmapdata = FS_LoadFile(reffile, &nmaplen);
 962                 if(!nmapdata)
 963                 {
 964                         printf("FS_LoadFile failed\n");
 965                         return 2;
 966                 }
 967                 refmap = LoadTGA_BGRA(nmapdata, nmaplen);
 968                 free(nmapdata);
 969                 if(!refmap)
 970                 {
 971                         printf("LoadTGA_BGRA failed\n");
 972                         return 2;
 973                 }
 974                 if(image_width != w || image_height != h)
 975                 {
 976                         printf("reference map must have same size as input normalmap\n");
 977                         return 2;
 978                 }
 979         }
 980         else
 981                 refmap = NULL;
 982
 983         if(scale < -6)
 984                 hmap_to_nmap(nmap, image_width, image_height, -scale-7, offset);
 985         else if(scale < 0)
 986                 hmap_to_nmap_local(nmap, image_width, image_height, -scale-1, offset);
 987         else
 988                 nmap_to_hmap(nmap, refmap, image_width, image_height, scale, offset);
 989         if(!Image_WriteTGABGRA(outfile, image_width, image_height, nmap))
 990         {
 991                 printf("Image_WriteTGABGRA failed\n");
 992                 free(nmap);
 993                 return 2;
 994         }
 995         free(nmap);
 996         return 0;
 997 }