gl_textures.c

   1 #include "quakedef.h"
   2
   3 cvar_t          r_max_size = {"r_max_size", "2048"};
   4 cvar_t          r_picmip = {"r_picmip", "0"};
   5 cvar_t          r_lerpimages = {"r_lerpimages", "1"};
   6 cvar_t          r_upload = {"r_upload", "1"};
   7 cvar_t          r_precachetextures = {"r_precachetextures", "1", true};
   8
   9 int             gl_filter_min = GL_LINEAR_MIPMAP_LINEAR; //NEAREST;
  10 int             gl_filter_max = GL_LINEAR;
  11
  12
  13 int             texels;
  14
  15 // 65536x65536
  16 #define MAXMIPS 16
  17
  18 #define GLTEXF_LERPED 1
  19 #define GLTEXF_UPLOADED 2
  20
  21 typedef struct
  22 {
  23         char    identifier[64];
  24         int             texnum; // GL texture slot number
  25         int             texeldatasize; // computed memory usage of this texture (including mipmaps, expansion to 32bit, etc)
  26         byte    *inputtexels; // copy of the original texture supplied to the upload function, for re-uploading or deferred uploads (non-precached)
  27         int             inputtexeldatasize; // size of the original texture
  28         unsigned short width, height;
  29 // LordHavoc: CRC to identify cache mismatchs
  30         unsigned short crc;
  31         int flags; // the requested flags when the texture was supplied to the upload function
  32         int internalflags; // internal notes (lerped, etc)
  33 } gltexture_t;
  34
  35 #define MAX_GLTEXTURES  4096
  36 gltexture_t     *gltextures;
  37 unsigned int numgltextures = 0, gl_texture_number = 1;
  38
  39 void GL_UploadTexture(gltexture_t *t);
  40
  41 int R_GetTexture(rtexture_t *rt)
  42 {
  43         gltexture_t *glt;
  44         if (!rt)
  45                 return 0;
  46         glt = (gltexture_t *)rt;
  47         if (!(glt->internalflags & GLTEXF_UPLOADED))
  48         {
  49                 GL_UploadTexture(glt);
  50                 if (!(glt->internalflags & GLTEXF_UPLOADED))
  51                         Host_Error("R_GetTexture: unable to upload texture\n");
  52         }
  53         return glt->texnum;
  54 }
  55
  56 typedef struct
  57 {
  58         char *name;
  59         int     minimize, maximize;
  60 } glmode_t;
  61
  62 glmode_t modes[] =
  63 {
  64         {"GL_NEAREST", GL_NEAREST, GL_NEAREST},
  65         {"GL_LINEAR", GL_LINEAR, GL_LINEAR},
  66         {"GL_NEAREST_MIPMAP_NEAREST", GL_NEAREST_MIPMAP_NEAREST, GL_NEAREST},
  67         {"GL_LINEAR_MIPMAP_NEAREST", GL_LINEAR_MIPMAP_NEAREST, GL_LINEAR},
  68         {"GL_NEAREST_MIPMAP_LINEAR", GL_NEAREST_MIPMAP_LINEAR, GL_NEAREST},
  69         {"GL_LINEAR_MIPMAP_LINEAR", GL_LINEAR_MIPMAP_LINEAR, GL_LINEAR}
  70 };
  71
  72 /*
  73 ===============
  74 Draw_TextureMode_f
  75 ===============
  76 */
  77 void Draw_TextureMode_f (void)
  78 {
  79         int             i;
  80         gltexture_t     *glt;
  81
  82         if (Cmd_Argc() == 1)
  83         {
  84                 for (i=0 ; i< 6 ; i++)
  85                         if (gl_filter_min == modes[i].minimize)
  86                         {
  87                                 Con_Printf ("%s\n", modes[i].name);
  88                                 return;
  89                         }
  90                 Con_Printf ("current filter is unknown???\n");
  91                 return;
  92         }
  93
  94         for (i=0 ; i< 6 ; i++)
  95         {
  96                 if (!Q_strcasecmp (modes[i].name, Cmd_Argv(1) ) )
  97                         break;
  98         }
  99         if (i == 6)
 100         {
 101                 Con_Printf ("bad filter name\n");
 102                 return;
 103         }
 104
 105         gl_filter_min = modes[i].minimize;
 106         gl_filter_max = modes[i].maximize;
 107
 108         if (!r_upload.value)
 109                 return;
 110         // change all the existing mipmap texture objects
 111         for (i=0, glt=gltextures ; i<numgltextures ; i++, glt++)
 112         {
 113                 if (glt->flags & TEXF_MIPMAP)
 114                 {
 115                         glBindTexture(GL_TEXTURE_2D, glt->texnum);
 116                         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, gl_filter_min);
 117                         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, gl_filter_max);
 118                 }
 119         }
 120 }
 121
 122 void GL_TextureStats_Print(char *name, int total, int total2, int loaded, int crc, int mip, int alpha, int total2valid)
 123 {
 124         if (!name[0])
 125                 name = "<unnamed>";
 126         Con_Printf("%5iK %c%5iK%c %04X %s %s %s %s\n", total, total2valid ? ' ' : '(', total2, total2valid ? ' ' : ')', crc, loaded ? "loaded" : "      ", mip ? "mip" : "   ", alpha ? "alpha" : "     ", name);
 127 }
 128
 129 void GL_TextureStats_PrintTotal(void)
 130 {
 131         int i, t = 0, p = 0, loaded = 0, loadedt = 0, loadedp = 0;
 132         gltexture_t *glt;
 133         for (i = 0, glt = gltextures;i < numgltextures;i++, glt++)
 134         {
 135                 t += glt->texeldatasize;
 136                 p += glt->inputtexeldatasize;
 137                 if (glt->internalflags & GLTEXF_UPLOADED)
 138                 {
 139                         loaded++;
 140                         loadedt += glt->texeldatasize;
 141                         loadedp += glt->inputtexeldatasize;
 142                 }
 143         }
 144         Con_Printf("total: %i (%.3fMB, %.3fMB original), uploaded %i (%.3fMB, %.3fMB original), upload on demand %i (%.3fMB, %.3fMB original)\n", numgltextures, t / 1048576.0, p / 1048576.0, loaded, loadedt / 1048576.0, loadedp / 1048576.0, numgltextures - loaded, (t - loadedt) / 1048576.0, (p - loadedp) / 1048576.0);
 145 }
 146
 147 void GL_TextureStats_f(void)
 148 {
 149         int i;
 150         gltexture_t *glt;
 151         Con_Printf("kbytes original crc  loaded mip alpha name\n");
 152         for (i = 0, glt = gltextures;i < numgltextures;i++, glt++)
 153                 GL_TextureStats_Print(glt->identifier, (glt->texeldatasize + 1023) / 1024, (glt->inputtexeldatasize + 1023) / 1024, glt->internalflags & GLTEXF_UPLOADED, glt->crc, glt->flags & TEXF_MIPMAP, glt->flags & TEXF_ALPHA, glt->inputtexels != NULL);
 154         GL_TextureStats_PrintTotal();
 155 }
 156
 157 char engineversion[40];
 158
 159 //void GL_UploadTexture (gltexture_t *glt);
 160 void r_textures_start()
 161 {
 162 //      int i;
 163 //      gltexture_t *glt;
 164 //      for (i=0, glt=gltextures ; i<numgltextures ; i++, glt++)
 165 //              GL_UploadTexture(glt);
 166 }
 167
 168 void r_textures_shutdown()
 169 {
 170 }
 171
 172 void R_Textures_Init (void)
 173 {
 174         Cmd_AddCommand("r_texturestats", GL_TextureStats_f);
 175         Cvar_RegisterVariable (&r_max_size);
 176         Cvar_RegisterVariable (&r_picmip);
 177         Cvar_RegisterVariable (&r_lerpimages);
 178         Cvar_RegisterVariable (&r_upload);
 179         Cvar_RegisterVariable (&r_precachetextures);
 180 #ifdef NORENDER
 181         r_upload.value = 0;
 182 #endif
 183
 184         // 3dfx can only handle 256 wide textures
 185         if (!Q_strncasecmp ((char *)gl_renderer, "3dfx",4) || strstr((char *)gl_renderer, "Glide"))
 186                 Cvar_Set ("r_max_size", "256");
 187
 188         gltextures = qmalloc(sizeof(gltexture_t) * MAX_GLTEXTURES);
 189         memset(gltextures, 0, sizeof(gltexture_t) * MAX_GLTEXTURES);
 190         Cmd_AddCommand ("gl_texturemode", &Draw_TextureMode_f);
 191
 192         R_RegisterModule("R_Textures", r_textures_start, r_textures_shutdown);
 193 }
 194
 195 /*
 196 ================
 197 R_FindTexture
 198 ================
 199 */
 200 int R_FindTexture (char *identifier)
 201 {
 202         int             i;
 203         gltexture_t     *glt;
 204
 205         for (i=0, glt=gltextures ; i<numgltextures ; i++, glt++)
 206         {
 207                 if (!strcmp (identifier, glt->identifier))
 208                         return gltextures[i].texnum;
 209         }
 210
 211         return -1;
 212 }
 213
 214 void R_ResampleTextureLerpLine (byte *in, byte *out, int inwidth, int outwidth)
 215 {
 216         int             j, xi, oldx = 0, f, fstep, l1, l2, endx;
 217         fstep = (int) (inwidth*65536.0f/outwidth);
 218         endx = (inwidth-1);
 219         for (j = 0,f = 0;j < outwidth;j++, f += fstep)
 220         {
 221                 xi = (int) f >> 16;
 222                 if (xi != oldx)
 223                 {
 224                         in += (xi - oldx) * 4;
 225                         oldx = xi;
 226                 }
 227                 if (xi < endx)
 228                 {
 229                         l2 = f & 0xFFFF;
 230                         l1 = 0x10000 - l2;
 231                         *out++ = (byte) ((in[0] * l1 + in[4] * l2) >> 16);
 232                         *out++ = (byte) ((in[1] * l1 + in[5] * l2) >> 16);
 233                         *out++ = (byte) ((in[2] * l1 + in[6] * l2) >> 16);
 234                         *out++ = (byte) ((in[3] * l1 + in[7] * l2) >> 16);
 235                 }
 236                 else // last pixel of the line has no pixel to lerp to
 237                 {
 238                         *out++ = in[0];
 239                         *out++ = in[1];
 240                         *out++ = in[2];
 241                         *out++ = in[3];
 242                 }
 243         }
 244 }
 245
 246 /*
 247 ================
 248 R_ResampleTexture
 249 ================
 250 */
 251 void R_ResampleTexture (void *indata, int inwidth, int inheight, void *outdata,  int outwidth, int outheight)
 252 {
 253         if (r_lerpimages.value)
 254         {
 255                 int             i, j, yi, oldy, f, fstep, l1, l2, endy = (inheight-1);
 256                 byte    *inrow, *out, *row1, *row2;
 257                 out = outdata;
 258                 fstep = (int) (inheight*65536.0f/outheight);
 259
 260                 row1 = qmalloc(outwidth*4);
 261                 row2 = qmalloc(outwidth*4);
 262                 inrow = indata;
 263                 oldy = 0;
 264                 R_ResampleTextureLerpLine (inrow, row1, inwidth, outwidth);
 265                 R_ResampleTextureLerpLine (inrow + inwidth*4, row2, inwidth, outwidth);
 266                 for (i = 0, f = 0;i < outheight;i++,f += fstep)
 267                 {
 268                         yi = f >> 16;
 269                         if (yi != oldy)
 270                         {
 271                                 inrow = (byte *)indata + inwidth*4*yi;
 272                                 if (yi == oldy+1)
 273                                         memcpy(row1, row2, outwidth*4);
 274                                 else
 275                                         R_ResampleTextureLerpLine (inrow, row1, inwidth, outwidth);
 276                                 if (yi < endy)
 277                                         R_ResampleTextureLerpLine (inrow + inwidth*4, row2, inwidth, outwidth);
 278                                 else
 279                                         memcpy(row2, row1, outwidth*4);
 280                                 oldy = yi;
 281                         }
 282                         if (yi < endy)
 283                         {
 284                                 l2 = f & 0xFFFF;
 285                                 l1 = 0x10000 - l2;
 286                                 for (j = 0;j < outwidth;j++)
 287                                 {
 288                                         *out++ = (byte) ((*row1++ * l1 + *row2++ * l2) >> 16);
 289                                         *out++ = (byte) ((*row1++ * l1 + *row2++ * l2) >> 16);
 290                                         *out++ = (byte) ((*row1++ * l1 + *row2++ * l2) >> 16);
 291                                         *out++ = (byte) ((*row1++ * l1 + *row2++ * l2) >> 16);
 292                                 }
 293                                 row1 -= outwidth*4;
 294                                 row2 -= outwidth*4;
 295                         }
 296                         else // last line has no pixels to lerp to
 297                         {
 298                                 for (j = 0;j < outwidth;j++)
 299                                 {
 300                                         *out++ = *row1++;
 301                                         *out++ = *row1++;
 302                                         *out++ = *row1++;
 303                                         *out++ = *row1++;
 304                                 }
 305                                 row1 -= outwidth*4;
 306                         }
 307                 }
 308                 qfree(row1);
 309                 qfree(row2);
 310         }
 311         else
 312         {
 313                 int             i, j;
 314                 unsigned        frac, fracstep;
 315                 byte    *inrow, *out, *inpix;
 316                 out = outdata;
 317
 318                 fracstep = inwidth*0x10000/outwidth;
 319                 for (i=0 ; i<outheight ; i++)
 320                 {
 321                         inrow = (byte *)indata + inwidth*(i*inheight/outheight)*4;
 322                         frac = fracstep >> 1;
 323                         for (j=0 ; j<outwidth ; j+=4)
 324                         {
 325                                 inpix = inrow + ((frac >> 14) & ~3);*out++ = qgamma[*inpix++];*out++ = qgamma[*inpix++];*out++ = qgamma[*inpix++];*out++ =       *inpix++ ;frac += fracstep;
 326                                 inpix = inrow + ((frac >> 14) & ~3);*out++ = qgamma[*inpix++];*out++ = qgamma[*inpix++];*out++ = qgamma[*inpix++];*out++ =       *inpix++ ;frac += fracstep;
 327                                 inpix = inrow + ((frac >> 14) & ~3);*out++ = qgamma[*inpix++];*out++ = qgamma[*inpix++];*out++ = qgamma[*inpix++];*out++ =       *inpix++ ;frac += fracstep;
 328                                 inpix = inrow + ((frac >> 14) & ~3);*out++ = qgamma[*inpix++];*out++ = qgamma[*inpix++];*out++ = qgamma[*inpix++];*out++ =       *inpix++ ;frac += fracstep;
 329                         }
 330                 }
 331         }
 332 }
 333
 334 // in can be the same as out
 335 void GL_MipReduce(byte *in, byte *out, int width, int height, int destwidth, int destheight)
 336 {
 337         int x, y, width2, height2, nextrow;
 338         if (width > destwidth)
 339         {
 340                 if (height > destheight)
 341                 {
 342                         // reduce both
 343                         width2 = width >> 1;
 344                         height2 = height >> 1;
 345                         nextrow = width << 2;
 346                         for (y = 0;y < height2;y++)
 347                         {
 348                                 for (x = 0;x < width2;x++)
 349                                 {
 350                                         out[0] = (byte) ((in[0] + in[4] + in[nextrow  ] + in[nextrow+4]) >> 2);
 351                                         out[1] = (byte) ((in[1] + in[5] + in[nextrow+1] + in[nextrow+5]) >> 2);
 352                                         out[2] = (byte) ((in[2] + in[6] + in[nextrow+2] + in[nextrow+6]) >> 2);
 353                                         out[3] = (byte) ((in[3] + in[7] + in[nextrow+3] + in[nextrow+7]) >> 2);
 354                                         out += 4;
 355                                         in += 8;
 356                                 }
 357                                 in += nextrow; // skip a line
 358                         }
 359                 }
 360                 else
 361                 {
 362                         // reduce width
 363                         width2 = width >> 1;
 364                         for (y = 0;y < height;y++)
 365                         {
 366                                 for (x = 0;x < width2;x++)
 367                                 {
 368                                         out[0] = (byte) ((in[0] + in[4]) >> 1);
 369                                         out[1] = (byte) ((in[1] + in[5]) >> 1);
 370                                         out[2] = (byte) ((in[2] + in[6]) >> 1);
 371                                         out[3] = (byte) ((in[3] + in[7]) >> 1);
 372                                         out += 4;
 373                                         in += 8;
 374                                 }
 375                         }
 376                 }
 377         }
 378         else
 379         {
 380                 if (height > destheight)
 381                 {
 382                         // reduce height
 383                         height2 = height >> 1;
 384                         nextrow = width << 2;
 385                         for (y = 0;y < height2;y++)
 386                         {
 387                                 for (x = 0;x < width;x++)
 388                                 {
 389                                         out[0] = (byte) ((in[0] + in[nextrow  ]) >> 1);
 390                                         out[1] = (byte) ((in[1] + in[nextrow+1]) >> 1);
 391                                         out[2] = (byte) ((in[2] + in[nextrow+2]) >> 1);
 392                                         out[3] = (byte) ((in[3] + in[nextrow+3]) >> 1);
 393                                         out += 4;
 394                                         in += 4;
 395                                 }
 396                                 in += nextrow; // skip a line
 397                         }
 398                 }
 399                 else
 400                         Sys_Error("GL_MipReduce: desired size already achieved\n");
 401         }
 402 }
 403
 404 void GL_Upload32(int glslot, byte *data, int width, int height, int flags)
 405 {
 406         int mip, width2, height2, width3, height3, internalformat;
 407         byte *gammadata, *buffer;
 408
 409         if (!r_upload.value)
 410                 return;
 411
 412         // 3 and 4 are converted by the driver to it's preferred format for the current display mode
 413         internalformat = 3;
 414         if (flags & TEXF_ALPHA)
 415                 internalformat = 4;
 416
 417         // calculate power of 2 size
 418         width2 = 1;while (width2 < width) width2 <<= 1;
 419         height2 = 1;while (height2 < height) height2 <<= 1;
 420         // calculate final size (mipmapped downward to this)
 421         width3 = width2 >> (int) r_picmip.value;
 422         height3 = height2 >> (int) r_picmip.value;
 423         while (width3 > (int) r_max_size.value) width3 >>= 1;
 424         while (height3 > (int) r_max_size.value) height3 >>= 1;
 425         if (width3 < 1) width3 = 1;
 426         if (height3 < 1) height3 = 1;
 427
 428         gammadata = qmalloc(width*height*4);
 429         buffer = qmalloc(width2*height2*4);
 430         if (!gammadata || !buffer)
 431                 Host_Error("GL_Upload32: out of memory\n");
 432
 433         Image_CopyRGBAGamma(data, gammadata, width*height);
 434
 435         R_ResampleTexture(gammadata, width, height, buffer, width2, height2);
 436
 437         qfree(gammadata);
 438
 439         while (width2 > width3 || height2 > height3)
 440         {
 441                 GL_MipReduce(buffer, buffer, width2, height2, width3, height3);
 442
 443                 if (width2 > width3)
 444                         width2 >>= 1;
 445                 if (height2 > height3)
 446                         height2 >>= 1;
 447         }
 448
 449         glBindTexture(GL_TEXTURE_2D, glslot);
 450         mip = 0;
 451         glTexImage2D(GL_TEXTURE_2D, mip++, internalformat, width2, height2, 0, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
 452         if (flags & TEXF_MIPMAP)
 453         {
 454                 while (width2 > 1 || height2 > 1)
 455                 {
 456                         GL_MipReduce(buffer, buffer, width2, height2, 1, 1);
 457
 458                         if (width2 > 1)
 459                                 width2 >>= 1;
 460                         if (height2 > 1)
 461                                 height2 >>= 1;
 462
 463                         glTexImage2D(GL_TEXTURE_2D, mip++, internalformat, width2, height2, 0, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
 464                 }
 465
 466                 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, gl_filter_min);
 467                 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, gl_filter_max);
 468         }
 469         else
 470         {
 471                 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, gl_filter_max);
 472                 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, gl_filter_max);
 473         }
 474         glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 475
 476         qfree(buffer);
 477 }
 478
 479 void GL_Upload8 (int glslot, byte *data, int width, int height, int flags)
 480 {
 481         byte *data32;
 482         data32 = qmalloc(width*height*4);
 483         Image_Copy8bitRGBA(data, data32, width*height, d_8to24table);
 484         GL_Upload32(glslot, data32, width, height, flags);
 485         qfree(data32);
 486 }
 487
 488 void GL_UploadTexture (gltexture_t *glt)
 489 {
 490         if (glt->inputtexels == NULL)
 491                 return;
 492         if (glt->flags & TEXF_RGBA)
 493                 GL_Upload32(glt->texnum, glt->inputtexels, glt->width, glt->height, glt->flags);
 494         else // 8bit
 495                 GL_Upload8(glt->texnum, glt->inputtexels, glt->width, glt->height, glt->flags);
 496         glt->internalflags |= GLTEXF_UPLOADED;
 497         qfree(glt->inputtexels);
 498         glt->inputtexels = NULL;
 499 }
 500
 501 int R_CalcTexelDataSize (int width, int height, int mipmapped)
 502 {
 503         int width2, height2, size;
 504         width2 = 1;while (width2 < width) width2 <<= 1;
 505         height2 = 1;while (height2 < height) height2 <<= 1;
 506         // calculate final size (mipmapped downward to this)
 507         width2 >>= (int) r_picmip.value;
 508         height2 >>= (int) r_picmip.value;
 509         while (width2 > (int) r_max_size.value) width2 >>= 1;
 510         while (height2 > (int) r_max_size.value) height2 >>= 1;
 511         if (width2 < 1) width2 = 1;
 512         if (height2 < 1) height2 = 1;
 513
 514         size = 0;
 515         if (mipmapped)
 516         {
 517                 while (width2 > 1 || height2 > 1)
 518                 {
 519                         size += width2 * height2;
 520                         if (width2 > 1)
 521                                 width2 >>= 1;
 522                         if (height2 > 1)
 523                                 height2 >>= 1;
 524                 }
 525                 size++; // count the last 1x1 mipmap
 526         }
 527         else
 528                 size = width2*height2;
 529
 530         size *= 4; // RGBA
 531
 532         return size;
 533 }
 534
 535 /*
 536 ================
 537 GL_LoadTexture
 538 ================
 539 */
 540 rtexture_t *R_LoadTexture (char *identifier, int width, int height, byte *data, int flags)
 541 {
 542         int                             i, bytesperpixel, internalflags, precache;
 543         gltexture_t             *glt;
 544         unsigned short  crc;
 545
 546         if (isDedicated)
 547                 return NULL;
 548
 549         if (!identifier[0])
 550                 Host_Error("R_LoadTexture: no identifier\n");
 551
 552         // clear the alpha flag if the texture has no transparent pixels
 553         if (flags & TEXF_ALPHA)
 554         {
 555                 int alpha = false;
 556                 if (flags & TEXF_RGBA)
 557                 {
 558                         for (i = 0;i < width * height;i++)
 559                         {
 560                                 if (data[i * 4 + 3] < 255)
 561                                 {
 562                                         alpha = true;
 563                                         break;
 564                                 }
 565                         }
 566                 }
 567                 else
 568                 {
 569                         for (i = 0;i < width * height;i++)
 570                         {
 571                                 if (data[i] == 255)
 572                                 {
 573                                         alpha = true;
 574                                         break;
 575                                 }
 576                         }
 577                 }
 578                 if (!alpha)
 579                         flags &= ~TEXF_ALPHA;
 580         }
 581
 582         if (flags & TEXF_RGBA)
 583                 bytesperpixel = 4;
 584         else
 585                 bytesperpixel = 1;
 586
 587         internalflags = 0;
 588         if (r_lerpimages.value != 0)
 589                 internalflags |= GLTEXF_LERPED;
 590
 591         // LordHavoc: do a CRC to confirm the data really is the same as previous occurances.
 592         crc = CRC_Block(data, width*height*bytesperpixel);
 593         // see if the texture is already present
 594         for (i=0, glt=gltextures ; i<numgltextures ; i++, glt++)
 595         {
 596                 if (!strcmp (identifier, glt->identifier))
 597                 {
 598                         // LordHavoc: everyone hates cache mismatchs, so I fixed it
 599                         if (crc != glt->crc || width != glt->width || height != glt->height || flags != glt->flags)
 600                         {
 601                                 Con_DPrintf("GL_LoadTexture: cache mismatch, replacing old texture\n");
 602                                 goto GL_LoadTexture_setup; // drop out with glt pointing to the texture to replace
 603                         }
 604                         if (internalflags != glt->internalflags)
 605                                 goto GL_LoadTexture_setup; // drop out with glt pointing to the texture to replace
 606                         return (rtexture_t *)glt;
 607                 }
 608         }
 609
 610 /*
 611         if (freeglt)
 612         {
 613                 glt = freeglt;
 614                 strcpy (glt->identifier, identifier);
 615         }
 616         else
 617         {
 618 */
 619                 // LordHavoc: check if there are still slots available
 620                 if (numgltextures >= MAX_GLTEXTURES)
 621                         Sys_Error ("GL_LoadTexture: ran out of texture slots (%d)\n", MAX_GLTEXTURES);
 622                 glt = &gltextures[numgltextures++];
 623                 glt->texnum = gl_texture_number++;
 624                 strcpy (glt->identifier, identifier);
 625 //      }
 626
 627 // LordHavoc: label to drop out of the loop into the setup code
 628 GL_LoadTexture_setup:
 629         glt->crc = crc; // LordHavoc: used to verify textures are identical
 630         glt->width = width;
 631         glt->height = height;
 632         glt->flags = flags;
 633         glt->internalflags = internalflags;
 634
 635         if (glt->inputtexels)
 636                 qfree(glt->inputtexels);
 637         glt->inputtexeldatasize = width*height*bytesperpixel;
 638         glt->inputtexels = qmalloc(glt->inputtexeldatasize);
 639
 640         memcpy(glt->inputtexels, data, glt->inputtexeldatasize);
 641
 642         glt->texeldatasize = R_CalcTexelDataSize(width, height, flags & TEXF_MIPMAP);
 643
 644         precache = false;
 645         if (r_precachetextures.value >= 1)
 646         {
 647                 if (flags & TEXF_PRECACHE)
 648                         precache = true;
 649                 if (r_precachetextures.value >= 2)
 650                         precache = true;
 651         }
 652
 653         if (precache)
 654                 GL_UploadTexture(glt);
 655
 656         return (rtexture_t *)glt;
 657 }
 658
 659 // only used for lightmaps
 660 int R_GetTextureSlots(int count)
 661 {
 662         int i;
 663         i = gl_texture_number;
 664         gl_texture_number += count;
 665         return i;
 666 }