gl_textures.c

   1 #include "quakedef.h"
   2
   3 cvar_t          gl_max_size = {"gl_max_size", "1024"};
   4 cvar_t          gl_picmip = {"gl_picmip", "0"};
   5 cvar_t          gl_lerpimages = {"gl_lerpimages", "1"};
   6 cvar_t          r_upload = {"r_upload", "1"};
   7
   8 int             gl_filter_min = GL_LINEAR_MIPMAP_LINEAR; //NEAREST;
   9 int             gl_filter_max = GL_LINEAR;
  10
  11
  12 int             texels;
  13
  14 // 4096x4096
  15 #define MAXMIPS 12
  16
  17 typedef struct
  18 {
  19         int             texnum;
  20         int             totaltexels;
  21         byte    *texels[MAXMIPS];
  22         unsigned short texelsize[MAXMIPS][2];
  23         char    identifier[64];
  24         short   width, height;
  25 // LordHavoc: CRC to identify cache mismatchs
  26         unsigned short crc;
  27         char    mipmap;
  28         char    alpha;
  29         char    bytesperpixel;
  30         char    lerped; // whether this texture was uploaded with or without interpolation
  31 } gltexture_t;
  32
  33 #define MAX_GLTEXTURES  4096
  34 gltexture_t     gltextures[MAX_GLTEXTURES];
  35 int                     numgltextures;
  36
  37 typedef struct
  38 {
  39         char *name;
  40         int     minimize, maximize;
  41 } glmode_t;
  42
  43 glmode_t modes[] = {
  44         {"GL_NEAREST", GL_NEAREST, GL_NEAREST},
  45         {"GL_LINEAR", GL_LINEAR, GL_LINEAR},
  46         {"GL_NEAREST_MIPMAP_NEAREST", GL_NEAREST_MIPMAP_NEAREST, GL_NEAREST},
  47         {"GL_LINEAR_MIPMAP_NEAREST", GL_LINEAR_MIPMAP_NEAREST, GL_LINEAR},
  48         {"GL_NEAREST_MIPMAP_LINEAR", GL_NEAREST_MIPMAP_LINEAR, GL_NEAREST},
  49         {"GL_LINEAR_MIPMAP_LINEAR", GL_LINEAR_MIPMAP_LINEAR, GL_LINEAR}
  50 };
  51
  52 /*
  53 ===============
  54 Draw_TextureMode_f
  55 ===============
  56 */
  57 void Draw_TextureMode_f (void)
  58 {
  59         int             i;
  60         gltexture_t     *glt;
  61
  62         if (Cmd_Argc() == 1)
  63         {
  64                 for (i=0 ; i< 6 ; i++)
  65                         if (gl_filter_min == modes[i].minimize)
  66                         {
  67                                 Con_Printf ("%s\n", modes[i].name);
  68                                 return;
  69                         }
  70                 Con_Printf ("current filter is unknown???\n");
  71                 return;
  72         }
  73
  74         for (i=0 ; i< 6 ; i++)
  75         {
  76                 if (!Q_strcasecmp (modes[i].name, Cmd_Argv(1) ) )
  77                         break;
  78         }
  79         if (i == 6)
  80         {
  81                 Con_Printf ("bad filter name\n");
  82                 return;
  83         }
  84
  85         gl_filter_min = modes[i].minimize;
  86         gl_filter_max = modes[i].maximize;
  87
  88         if (!r_upload.value)
  89                 return;
  90         // change all the existing mipmap texture objects
  91         for (i=0, glt=gltextures ; i<numgltextures ; i++, glt++)
  92         {
  93                 if (glt->mipmap)
  94                 {
  95                         glBindTexture(GL_TEXTURE_2D, glt->texnum);
  96                         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, gl_filter_min);
  97                         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, gl_filter_max);
  98                 }
  99         }
 100 }
 101
 102 void GL_TextureStats_Print(char *name, int total, int crc, int mip, int alpha)
 103 {
 104         char n[64];
 105         int c = 0;
 106         if (!name[0])
 107                 name = "<unnamed>";
 108         while (name[c] && c < 28)
 109                 n[c++] = name[c];
 110         while (c < 28)
 111                 n[c++] = ' ';
 112         n[c] = 0;
 113         Con_Printf("%s %5i %04X %s %s\n", n, total, crc, mip ? "yes" : "no ", alpha ? "yes  " : "no   ");
 114 }
 115
 116 void GL_TextureStats_f(void)
 117 {
 118         int i, t = 0;
 119         gltexture_t *glt;
 120         Con_Printf("name                        kbytes crc  mip alpha\n");
 121         for (i = 0, glt = gltextures;i < numgltextures;i++, glt++)
 122         {
 123                 GL_TextureStats_Print(glt->identifier, ((glt->totaltexels * 4) + 512) >> 10, glt->crc, glt->mipmap, glt->alpha);
 124                 t += glt->totaltexels;
 125         }
 126         Con_Printf("%i textures, totalling %.3f mbytes\n", numgltextures, t / 1024.0 / 1024.0);
 127 }
 128
 129 extern int buildnumber;
 130
 131 char engineversion[40];
 132
 133 void GL_UploadTexture (gltexture_t *glt);
 134 void gl_textures_start()
 135 {
 136         int i;
 137         gltexture_t *glt;
 138         for (i=0, glt=gltextures ; i<numgltextures ; i++, glt++)
 139                 GL_UploadTexture(glt);
 140 }
 141
 142 void gl_textures_shutdown()
 143 {
 144 }
 145
 146 void GL_Textures_Init (void)
 147 {
 148         Cmd_AddCommand("r_texturestats", GL_TextureStats_f);
 149         Cvar_RegisterVariable (&gl_max_size);
 150         Cvar_RegisterVariable (&gl_picmip);
 151         Cvar_RegisterVariable (&gl_lerpimages);
 152         Cvar_RegisterVariable (&r_upload);
 153 #ifdef NORENDER
 154         r_upload.value = 0;
 155 #endif
 156
 157         // 3dfx can only handle 256 wide textures
 158         if (!Q_strncasecmp ((char *)gl_renderer, "3dfx",4) || strstr((char *)gl_renderer, "Glide"))
 159                 Cvar_Set ("gl_max_size", "256");
 160
 161         Cmd_AddCommand ("gl_texturemode", &Draw_TextureMode_f);
 162
 163         R_RegisterModule("GL_Textures", gl_textures_start, gl_textures_shutdown);
 164 }
 165
 166 /*
 167 ================
 168 GL_FindTexture
 169 ================
 170 */
 171 int GL_FindTexture (char *identifier)
 172 {
 173         int             i;
 174         gltexture_t     *glt;
 175
 176         for (i=0, glt=gltextures ; i<numgltextures ; i++, glt++)
 177         {
 178                 if (!strcmp (identifier, glt->identifier))
 179                         return gltextures[i].texnum;
 180         }
 181
 182         return -1;
 183 }
 184
 185 void GL_ResampleTextureLerpLine (byte *in, byte *out, int inwidth, int outwidth)
 186 {
 187         int             j, xi, oldx = 0, f, fstep, l1, l2, endx;
 188         fstep = (int) (inwidth*65536.0f/outwidth);
 189         endx = (inwidth-1);
 190         for (j = 0,f = 0;j < outwidth;j++, f += fstep)
 191         {
 192                 xi = (int) f >> 16;
 193                 if (xi != oldx)
 194                 {
 195                         in += (xi - oldx) * 4;
 196                         oldx = xi;
 197                 }
 198                 if (xi < endx)
 199                 {
 200                         l2 = f & 0xFFFF;
 201                         l1 = 0x10000 - l2;
 202                         *out++ = (byte) ((in[0] * l1 + in[4] * l2) >> 16);
 203                         *out++ = (byte) ((in[1] * l1 + in[5] * l2) >> 16);
 204                         *out++ = (byte) ((in[2] * l1 + in[6] * l2) >> 16);
 205                         *out++ = (byte) ((in[3] * l1 + in[7] * l2) >> 16);
 206                 }
 207                 else // last pixel of the line has no pixel to lerp to
 208                 {
 209                         *out++ = in[0];
 210                         *out++ = in[1];
 211                         *out++ = in[2];
 212                         *out++ = in[3];
 213                 }
 214         }
 215 }
 216
 217 /*
 218 ================
 219 GL_ResampleTexture
 220 ================
 221 */
 222 void GL_ResampleTexture (void *indata, int inwidth, int inheight, void *outdata,  int outwidth, int outheight)
 223 {
 224         if (gl_lerpimages.value)
 225         {
 226                 int             i, j, yi, oldy, f, fstep, l1, l2, endy = (inheight-1);
 227                 byte    *inrow, *out, *row1, *row2;
 228                 out = outdata;
 229                 fstep = (int) (inheight*65536.0f/outheight);
 230
 231                 row1 = malloc(outwidth*4);
 232                 row2 = malloc(outwidth*4);
 233                 inrow = indata;
 234                 oldy = 0;
 235                 GL_ResampleTextureLerpLine (inrow, row1, inwidth, outwidth);
 236                 GL_ResampleTextureLerpLine (inrow + inwidth*4, row2, inwidth, outwidth);
 237                 for (i = 0, f = 0;i < outheight;i++,f += fstep)
 238                 {
 239                         yi = f >> 16;
 240                         if (yi != oldy)
 241                         {
 242                                 inrow = (byte *)indata + inwidth*4*yi;
 243                                 if (yi == oldy+1)
 244                                         memcpy(row1, row2, outwidth*4);
 245                                 else
 246                                         GL_ResampleTextureLerpLine (inrow, row1, inwidth, outwidth);
 247                                 if (yi < endy)
 248                                         GL_ResampleTextureLerpLine (inrow + inwidth*4, row2, inwidth, outwidth);
 249                                 else
 250                                         memcpy(row2, row1, outwidth*4);
 251                                 oldy = yi;
 252                         }
 253                         if (yi < endy)
 254                         {
 255                                 l2 = f & 0xFFFF;
 256                                 l1 = 0x10000 - l2;
 257                                 for (j = 0;j < outwidth;j++)
 258                                 {
 259                                         *out++ = (byte) ((*row1++ * l1 + *row2++ * l2) >> 16);
 260                                         *out++ = (byte) ((*row1++ * l1 + *row2++ * l2) >> 16);
 261                                         *out++ = (byte) ((*row1++ * l1 + *row2++ * l2) >> 16);
 262                                         *out++ = (byte) ((*row1++ * l1 + *row2++ * l2) >> 16);
 263                                 }
 264                                 row1 -= outwidth*4;
 265                                 row2 -= outwidth*4;
 266                         }
 267                         else // last line has no pixels to lerp to
 268                         {
 269                                 for (j = 0;j < outwidth;j++)
 270                                 {
 271                                         *out++ = *row1++;
 272                                         *out++ = *row1++;
 273                                         *out++ = *row1++;
 274                                         *out++ = *row1++;
 275                                 }
 276                                 row1 -= outwidth*4;
 277                         }
 278                 }
 279                 free(row1);
 280                 free(row2);
 281         }
 282         else
 283         {
 284                 int             i, j;
 285                 unsigned        frac, fracstep;
 286                 byte    *inrow, *out, *inpix;
 287                 out = outdata;
 288
 289                 fracstep = inwidth*0x10000/outwidth;
 290                 for (i=0 ; i<outheight ; i++)
 291                 {
 292                         inrow = (byte *)indata + inwidth*(i*inheight/outheight)*4;
 293                         frac = fracstep >> 1;
 294                         for (j=0 ; j<outwidth ; j+=4)
 295                         {
 296                                 inpix = inrow + ((frac >> 14) & ~3);*out++ = qgamma[*inpix++];*out++ = qgamma[*inpix++];*out++ = qgamma[*inpix++];*out++ =       *inpix++ ;frac += fracstep;
 297                                 inpix = inrow + ((frac >> 14) & ~3);*out++ = qgamma[*inpix++];*out++ = qgamma[*inpix++];*out++ = qgamma[*inpix++];*out++ =       *inpix++ ;frac += fracstep;
 298                                 inpix = inrow + ((frac >> 14) & ~3);*out++ = qgamma[*inpix++];*out++ = qgamma[*inpix++];*out++ = qgamma[*inpix++];*out++ =       *inpix++ ;frac += fracstep;
 299                                 inpix = inrow + ((frac >> 14) & ~3);*out++ = qgamma[*inpix++];*out++ = qgamma[*inpix++];*out++ = qgamma[*inpix++];*out++ =       *inpix++ ;frac += fracstep;
 300                         }
 301                 }
 302         }
 303 }
 304
 305 void GL_FreeTexels(gltexture_t *glt)
 306 {
 307         if (glt->texels[0])
 308                 free(glt->texels[0]);
 309         glt->texels[0] = 0;
 310 }
 311
 312 void GL_AllocTexels(gltexture_t *glt, int width, int height, int mipmapped)
 313 {
 314         int i, w, h, size, done;
 315         if (glt->texels[0])
 316                 GL_FreeTexels(glt);
 317         glt->texelsize[0][0] = width;
 318         glt->texelsize[0][1] = height;
 319         if (mipmapped)
 320         {
 321                 size = 0;
 322                 w = width;h = height;
 323                 i = 0;
 324                 done = false;
 325                 for (i = 0;i < MAXMIPS;i++)
 326                 {
 327                         glt->texelsize[i][0] = w;
 328                         glt->texelsize[i][1] = h;
 329                         glt->texels[i] = (void *)size;
 330                         size += w*h*4;
 331                         if (w > 1)
 332                         {
 333                                 w >>= 1;
 334                                 if (h > 1)
 335                                         h >>= 1;
 336                         }
 337                         else if (h > 1)
 338                                 h >>= 1;
 339                         else
 340                         {
 341                                 i++;
 342                                 break;
 343                         }
 344                 }
 345                 glt->totaltexels = size;
 346                 while (i < MAXMIPS)
 347                         glt->texels[i++] = NULL;
 348                 glt->texels[0] = malloc(size);
 349                 for (i = 1;i < MAXMIPS && glt->texels[i];i++)
 350                         glt->texels[i] += (int) glt->texels[0];
 351         }
 352         else
 353         {
 354                 size = width*height*4;
 355                 glt->totaltexels = size;
 356                 glt->texels[0] = malloc(size);
 357                 for (i = 1;i < MAXMIPS;i++)
 358                         glt->texels[i] = NULL;
 359         }
 360         if (!glt->texels[0])
 361                 Sys_Error("GL_AllocTexels: out of memory\n");
 362 }
 363
 364 // in can be the same as out
 365 void GL_MipReduce(byte *in, byte *out, int width, int height, int destwidth, int destheight)
 366 {
 367         int x, y, width2, height2, nextrow;
 368         if (width > destwidth)
 369         {
 370                 if (height > destheight)
 371                 {
 372                         // reduce both
 373                         width2 = width >> 1;
 374                         height2 = height >> 1;
 375                         nextrow = width << 2;
 376                         for (y = 0;y < height2;y++)
 377                         {
 378                                 for (x = 0;x < width2;x++)
 379                                 {
 380                                         out[0] = (byte) ((in[0] + in[4] + in[nextrow  ] + in[nextrow+4]) >> 2);
 381                                         out[1] = (byte) ((in[1] + in[5] + in[nextrow+1] + in[nextrow+5]) >> 2);
 382                                         out[2] = (byte) ((in[2] + in[6] + in[nextrow+2] + in[nextrow+6]) >> 2);
 383                                         out[3] = (byte) ((in[3] + in[7] + in[nextrow+3] + in[nextrow+7]) >> 2);
 384                                         out += 4;
 385                                         in += 8;
 386                                 }
 387                                 in += nextrow; // skip a line
 388                         }
 389                 }
 390                 else
 391                 {
 392                         // reduce width
 393                         width2 = width >> 1;
 394                         for (y = 0;y < height;y++)
 395                         {
 396                                 for (x = 0;x < width2;x++)
 397                                 {
 398                                         out[0] = (byte) ((in[0] + in[4]) >> 1);
 399                                         out[1] = (byte) ((in[1] + in[5]) >> 1);
 400                                         out[2] = (byte) ((in[2] + in[6]) >> 1);
 401                                         out[3] = (byte) ((in[3] + in[7]) >> 1);
 402                                         out += 4;
 403                                         in += 8;
 404                                 }
 405                         }
 406                 }
 407         }
 408         else
 409         {
 410                 if (height > destheight)
 411                 {
 412                         // reduce height
 413                         height2 = height >> 1;
 414                         nextrow = width << 2;
 415                         for (y = 0;y < height2;y++)
 416                         {
 417                                 for (x = 0;x < width;x++)
 418                                 {
 419                                         out[0] = (byte) ((in[0] + in[nextrow  ]) >> 1);
 420                                         out[1] = (byte) ((in[1] + in[nextrow+1]) >> 1);
 421                                         out[2] = (byte) ((in[2] + in[nextrow+2]) >> 1);
 422                                         out[3] = (byte) ((in[3] + in[nextrow+3]) >> 1);
 423                                         out += 4;
 424                                         in += 4;
 425                                 }
 426                                 in += nextrow; // skip a line
 427                         }
 428                 }
 429                 else
 430                         Sys_Error("GL_MipReduce: desired size already achieved\n");
 431         }
 432 }
 433
 434 void GL_UploadTexture (gltexture_t *glt)
 435 {
 436         int mip, width, height;
 437         if (!r_upload.value)
 438                 return;
 439         glBindTexture(GL_TEXTURE_2D, glt->texnum);
 440         width = glt->width;
 441         height = glt->height;
 442         for (mip = 0;mip < MAXMIPS && glt->texels[mip];mip++)
 443                 glTexImage2D(GL_TEXTURE_2D, mip, glt->alpha ? 4 : 3, glt->texelsize[mip][0], glt->texelsize[mip][1], 0, GL_RGBA, GL_UNSIGNED_BYTE, glt->texels[mip]);
 444         if (glt->mipmap)
 445         {
 446                 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, gl_filter_min);
 447                 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, gl_filter_max);
 448         }
 449         else
 450         {
 451                 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, gl_filter_max);
 452                 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, gl_filter_max);
 453         }
 454         glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 455 }
 456
 457 /*
 458 ================
 459 GL_LoadTexture
 460 ================
 461 */
 462 int GL_LoadTexture (char *identifier, int width, int height, byte *data, qboolean mipmap, qboolean alpha, int bytesperpixel)
 463 {
 464         unsigned short  crc;
 465         int                             i, width2, height2, width3, height3, w, h, mip;
 466         gltexture_t             *glt;
 467
 468         if (isDedicated)
 469                 return 1;
 470
 471         // LordHavoc: do a CRC to confirm the data really is the same as previous occurances.
 472         crc = CRC_Block(data, width*height*bytesperpixel);
 473         // see if the texture is already present
 474         if (identifier[0])
 475         {
 476                 for (i=0, glt=gltextures ; i<numgltextures ; i++, glt++)
 477                 {
 478                         if (!strcmp (identifier, glt->identifier))
 479                         {
 480                                 // LordHavoc: everyone hates cache mismatchs, so I fixed it
 481                                 if (crc != glt->crc || width != glt->width || height != glt->height)
 482                                 {
 483                                         Con_DPrintf("GL_LoadTexture: cache mismatch, replacing old texture\n");
 484                                         goto GL_LoadTexture_setup; // drop out with glt pointing to the texture to replace
 485                                         //Sys_Error ("GL_LoadTexture: cache mismatch");
 486                                 }
 487                                 if ((gl_lerpimages.value != 0) != glt->lerped)
 488                                         goto GL_LoadTexture_setup; // drop out with glt pointing to the texture to replace
 489                                 return glt->texnum;
 490                         }
 491                 }
 492         }
 493         // LordHavoc: although this could be an else condition as it was in the original id code,
 494         //            it is more clear this way
 495         // LordHavoc: check if there are still slots available
 496         if (numgltextures >= MAX_GLTEXTURES)
 497                 Sys_Error ("GL_LoadTexture: ran out of texture slots (%d)\n", MAX_GLTEXTURES);
 498         glt = &gltextures[numgltextures++];
 499
 500         strcpy (glt->identifier, identifier);
 501         glt->texnum = texture_extension_number;
 502         texture_extension_number++;
 503 // LordHavoc: label to drop out of the loop into the setup code
 504 GL_LoadTexture_setup:
 505         // calculate power of 2 size
 506         width2 = 1;while (width2 < width) width2 <<= 1;
 507         height2 = 1;while (height2 < height) height2 <<= 1;
 508         // calculate final size (mipmapped downward to this)
 509         width3 = width2 >> (int) gl_picmip.value;
 510         height3 = height2 >> (int) gl_picmip.value;
 511         while (width3 > (int) gl_max_size.value) width3 >>= 1;
 512         while (height3 > (int) gl_max_size.value) height3 >>= 1;
 513         if (width3 < 1) width3 = 1;
 514         if (height3 < 1) height3 = 1;
 515
 516         // final storage
 517         GL_AllocTexels(glt, width3, height3, mipmap);
 518         glt->crc = crc; // LordHavoc: used to verify textures are identical
 519         glt->width = width;
 520         glt->height = height;
 521         glt->mipmap = mipmap;
 522         glt->bytesperpixel = bytesperpixel;
 523         glt->lerped = gl_lerpimages.value != 0;
 524         glt->alpha = false; // updated later
 525         if (width == width3 && height == height3) // perfect match
 526         {
 527                 if (bytesperpixel == 1) // 8bit
 528                         Image_Copy8bitRGBA(data, glt->texels[0], width*height, d_8to24table);
 529                 else
 530                         Image_CopyRGBAGamma(data, glt->texels[0], width*height);
 531         }
 532         else if (width == width2 && height == height2) // perfect match for top level, but needs to be reduced
 533         {
 534                 byte *temptexels2;
 535                 temptexels2 = malloc(width2*height2*4); // scaleup buffer
 536                 if (bytesperpixel == 1) // 8bit
 537                         Image_Copy8bitRGBA(data, temptexels2, width*height, d_8to24table);
 538                 else
 539                         Image_CopyRGBAGamma(data, temptexels2, width*height);
 540                 while (width2 > width3 || height2 > height3)
 541                 {
 542                         w = width2;h = height2;
 543                         if (width2 > width3) width2 >>= 1;
 544                         if (height2 > height3) height2 >>= 1;
 545                         if (width2 <= width3 && height2 <= height3) // size achieved
 546                                 GL_MipReduce(temptexels2, glt->texels[0], w, h, width3, height3);
 547                         else
 548                                 GL_MipReduce(temptexels2, temptexels2, w, h, width3, height3);
 549                 }
 550                 free(temptexels2);
 551         }
 552         else // scaling...
 553         {
 554                 byte *temptexels;
 555                 // pre-scaleup buffer
 556                 temptexels = malloc(width*height*4);
 557                 if (bytesperpixel == 1) // 8bit
 558                         Image_Copy8bitRGBA(data, temptexels, width*height, d_8to24table);
 559                 else
 560                         Image_CopyRGBAGamma(data, temptexels, width*height);
 561                 if (width2 != width3 || height2 != height3) // reduced by gl_pic_mip or gl_max_size
 562                 {
 563                         byte *temptexels2;
 564                         temptexels2 = malloc(width2*height2*4); // scaleup buffer
 565                         GL_ResampleTexture(temptexels, width, height, temptexels2, width2, height2);
 566                         while (width2 > width3 || height2 > height3)
 567                         {
 568                                 w = width2;h = height2;
 569                                 if (width2 > width3) width2 >>= 1;
 570                                 if (height2 > height3) height2 >>= 1;
 571                                 if (width2 <= width3 && height2 <= height3) // size achieved
 572                                         GL_MipReduce(temptexels2, glt->texels[0], w, h, width3, height3);
 573                                 else
 574                                         GL_MipReduce(temptexels2, temptexels2, w, h, width3, height3);
 575                         }
 576                         free(temptexels2);
 577                 }
 578                 else // copy directly
 579                         GL_ResampleTexture(temptexels, width, height, glt->texels[0], width2, height2);
 580                 free(temptexels);
 581         }
 582         if (alpha)
 583         {
 584                 byte    *in = glt->texels[0] + 3;
 585                 for (i = 0;i < width*height;i++, in += 4)
 586                         if (*in < 255)
 587                         {
 588                                 glt->alpha = true;
 589                                 break;
 590                         }
 591         }
 592         // this loop is skipped if there are no mipmaps to generate
 593         for (mip = 1;mip < MAXMIPS && glt->texels[mip];mip++)
 594                 GL_MipReduce(glt->texels[mip-1], glt->texels[mip], glt->texelsize[mip-1][0], glt->texelsize[mip-1][1], 1, 1);
 595         GL_UploadTexture(glt);
 596         GL_FreeTexels(glt);
 597
 598 //      if (bytesperpixel == 1) // 8bit
 599 //              GL_Upload8 (data, width, height, mipmap, alpha);
 600 //      else // 32bit
 601 //              GL_Upload32 (data, width, height, mipmap, true);
 602
 603         return glt->texnum;
 604 }
 605
 606 /*
 607 ================
 608 GL_LoadPicTexture
 609 ================
 610 */
 611 int GL_LoadPicTexture (qpic_t *pic)
 612 {
 613         return GL_LoadTexture ("", pic->width, pic->height, pic->data, false, true, 1);
 614 }
 615
 616 int GL_GetTextureSlots (int count)
 617 {
 618         gltexture_t             *glt, *first;
 619
 620         first = glt = &gltextures[numgltextures];
 621         while (count--)
 622         {
 623                 glt->identifier[0] = 0;
 624                 glt->texnum = texture_extension_number++;
 625                 glt->crc = 0;
 626                 glt->width = 0;
 627                 glt->height = 0;
 628                 glt->bytesperpixel = 0;
 629                 glt++;
 630                 numgltextures++;
 631         }
 632         return first->texnum;
 633 }