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 void GL_TextureStats_PrintTotal(void)
 130 {
 131         int i, t = 0;
 132         gltexture_t *glt;
 133         for (i = 0, glt = gltextures;i < numgltextures;i++, glt++)
 134                 t += glt->totaltexels;
 135         Con_Printf("%i textures, totalling %.3f mbytes\n", numgltextures, t / 1024.0 / 1024.0);
 136 }
 137
 138 extern int buildnumber;
 139
 140 char engineversion[40];
 141
 142 void GL_UploadTexture (gltexture_t *glt);
 143 void gl_textures_start()
 144 {
 145         int i;
 146         gltexture_t *glt;
 147         for (i=0, glt=gltextures ; i<numgltextures ; i++, glt++)
 148                 GL_UploadTexture(glt);
 149 }
 150
 151 void gl_textures_shutdown()
 152 {
 153 }
 154
 155 void GL_Textures_Init (void)
 156 {
 157         Cmd_AddCommand("r_texturestats", GL_TextureStats_f);
 158         Cvar_RegisterVariable (&gl_max_size);
 159         Cvar_RegisterVariable (&gl_picmip);
 160         Cvar_RegisterVariable (&gl_lerpimages);
 161         Cvar_RegisterVariable (&r_upload);
 162 #ifdef NORENDER
 163         r_upload.value = 0;
 164 #endif
 165
 166         // 3dfx can only handle 256 wide textures
 167         if (!Q_strncasecmp ((char *)gl_renderer, "3dfx",4) || strstr((char *)gl_renderer, "Glide"))
 168                 Cvar_Set ("gl_max_size", "256");
 169
 170         Cmd_AddCommand ("gl_texturemode", &Draw_TextureMode_f);
 171
 172         R_RegisterModule("GL_Textures", gl_textures_start, gl_textures_shutdown);
 173 }
 174
 175 /*
 176 ================
 177 GL_FindTexture
 178 ================
 179 */
 180 int GL_FindTexture (char *identifier)
 181 {
 182         int             i;
 183         gltexture_t     *glt;
 184
 185         for (i=0, glt=gltextures ; i<numgltextures ; i++, glt++)
 186         {
 187                 if (!strcmp (identifier, glt->identifier))
 188                         return gltextures[i].texnum;
 189         }
 190
 191         return -1;
 192 }
 193
 194 void GL_ResampleTextureLerpLine (byte *in, byte *out, int inwidth, int outwidth)
 195 {
 196         int             j, xi, oldx = 0, f, fstep, l1, l2, endx;
 197         fstep = (int) (inwidth*65536.0f/outwidth);
 198         endx = (inwidth-1);
 199         for (j = 0,f = 0;j < outwidth;j++, f += fstep)
 200         {
 201                 xi = (int) f >> 16;
 202                 if (xi != oldx)
 203                 {
 204                         in += (xi - oldx) * 4;
 205                         oldx = xi;
 206                 }
 207                 if (xi < endx)
 208                 {
 209                         l2 = f & 0xFFFF;
 210                         l1 = 0x10000 - l2;
 211                         *out++ = (byte) ((in[0] * l1 + in[4] * l2) >> 16);
 212                         *out++ = (byte) ((in[1] * l1 + in[5] * l2) >> 16);
 213                         *out++ = (byte) ((in[2] * l1 + in[6] * l2) >> 16);
 214                         *out++ = (byte) ((in[3] * l1 + in[7] * l2) >> 16);
 215                 }
 216                 else // last pixel of the line has no pixel to lerp to
 217                 {
 218                         *out++ = in[0];
 219                         *out++ = in[1];
 220                         *out++ = in[2];
 221                         *out++ = in[3];
 222                 }
 223         }
 224 }
 225
 226 /*
 227 ================
 228 GL_ResampleTexture
 229 ================
 230 */
 231 void GL_ResampleTexture (void *indata, int inwidth, int inheight, void *outdata,  int outwidth, int outheight)
 232 {
 233         if (gl_lerpimages.value)
 234         {
 235                 int             i, j, yi, oldy, f, fstep, l1, l2, endy = (inheight-1);
 236                 byte    *inrow, *out, *row1, *row2;
 237                 out = outdata;
 238                 fstep = (int) (inheight*65536.0f/outheight);
 239
 240                 row1 = qmalloc(outwidth*4);
 241                 row2 = qmalloc(outwidth*4);
 242                 inrow = indata;
 243                 oldy = 0;
 244                 GL_ResampleTextureLerpLine (inrow, row1, inwidth, outwidth);
 245                 GL_ResampleTextureLerpLine (inrow + inwidth*4, row2, inwidth, outwidth);
 246                 for (i = 0, f = 0;i < outheight;i++,f += fstep)
 247                 {
 248                         yi = f >> 16;
 249                         if (yi != oldy)
 250                         {
 251                                 inrow = (byte *)indata + inwidth*4*yi;
 252                                 if (yi == oldy+1)
 253                                         memcpy(row1, row2, outwidth*4);
 254                                 else
 255                                         GL_ResampleTextureLerpLine (inrow, row1, inwidth, outwidth);
 256                                 if (yi < endy)
 257                                         GL_ResampleTextureLerpLine (inrow + inwidth*4, row2, inwidth, outwidth);
 258                                 else
 259                                         memcpy(row2, row1, outwidth*4);
 260                                 oldy = yi;
 261                         }
 262                         if (yi < endy)
 263                         {
 264                                 l2 = f & 0xFFFF;
 265                                 l1 = 0x10000 - l2;
 266                                 for (j = 0;j < outwidth;j++)
 267                                 {
 268                                         *out++ = (byte) ((*row1++ * l1 + *row2++ * l2) >> 16);
 269                                         *out++ = (byte) ((*row1++ * l1 + *row2++ * l2) >> 16);
 270                                         *out++ = (byte) ((*row1++ * l1 + *row2++ * l2) >> 16);
 271                                         *out++ = (byte) ((*row1++ * l1 + *row2++ * l2) >> 16);
 272                                 }
 273                                 row1 -= outwidth*4;
 274                                 row2 -= outwidth*4;
 275                         }
 276                         else // last line has no pixels to lerp to
 277                         {
 278                                 for (j = 0;j < outwidth;j++)
 279                                 {
 280                                         *out++ = *row1++;
 281                                         *out++ = *row1++;
 282                                         *out++ = *row1++;
 283                                         *out++ = *row1++;
 284                                 }
 285                                 row1 -= outwidth*4;
 286                         }
 287                 }
 288                 qfree(row1);
 289                 qfree(row2);
 290         }
 291         else
 292         {
 293                 int             i, j;
 294                 unsigned        frac, fracstep;
 295                 byte    *inrow, *out, *inpix;
 296                 out = outdata;
 297
 298                 fracstep = inwidth*0x10000/outwidth;
 299                 for (i=0 ; i<outheight ; i++)
 300                 {
 301                         inrow = (byte *)indata + inwidth*(i*inheight/outheight)*4;
 302                         frac = fracstep >> 1;
 303                         for (j=0 ; j<outwidth ; j+=4)
 304                         {
 305                                 inpix = inrow + ((frac >> 14) & ~3);*out++ = qgamma[*inpix++];*out++ = qgamma[*inpix++];*out++ = qgamma[*inpix++];*out++ =       *inpix++ ;frac += fracstep;
 306                                 inpix = inrow + ((frac >> 14) & ~3);*out++ = qgamma[*inpix++];*out++ = qgamma[*inpix++];*out++ = qgamma[*inpix++];*out++ =       *inpix++ ;frac += fracstep;
 307                                 inpix = inrow + ((frac >> 14) & ~3);*out++ = qgamma[*inpix++];*out++ = qgamma[*inpix++];*out++ = qgamma[*inpix++];*out++ =       *inpix++ ;frac += fracstep;
 308                                 inpix = inrow + ((frac >> 14) & ~3);*out++ = qgamma[*inpix++];*out++ = qgamma[*inpix++];*out++ = qgamma[*inpix++];*out++ =       *inpix++ ;frac += fracstep;
 309                         }
 310                 }
 311         }
 312 }
 313
 314 void GL_FreeTexels(gltexture_t *glt)
 315 {
 316         if (glt->texels[0])
 317                 qfree(glt->texels[0]);
 318         glt->texels[0] = 0;
 319 }
 320
 321 void GL_AllocTexels(gltexture_t *glt, int width, int height, int mipmapped)
 322 {
 323         int i, w, h, size, done;
 324         if (glt->texels[0])
 325                 GL_FreeTexels(glt);
 326         glt->texelsize[0][0] = width;
 327         glt->texelsize[0][1] = height;
 328         if (mipmapped)
 329         {
 330                 size = 0;
 331                 w = width;h = height;
 332                 i = 0;
 333                 done = false;
 334                 for (i = 0;i < MAXMIPS;i++)
 335                 {
 336                         glt->texelsize[i][0] = w;
 337                         glt->texelsize[i][1] = h;
 338                         glt->texels[i] = (void *)size;
 339                         size += w*h*4;
 340                         if (w > 1)
 341                         {
 342                                 w >>= 1;
 343                                 if (h > 1)
 344                                         h >>= 1;
 345                         }
 346                         else if (h > 1)
 347                                 h >>= 1;
 348                         else
 349                         {
 350                                 i++;
 351                                 break;
 352                         }
 353                 }
 354                 glt->totaltexels = size;
 355                 while (i < MAXMIPS)
 356                         glt->texels[i++] = NULL;
 357                 glt->texels[0] = qmalloc(size);
 358                 for (i = 1;i < MAXMIPS && glt->texels[i];i++)
 359                         glt->texels[i] += (int) glt->texels[0];
 360         }
 361         else
 362         {
 363                 size = width*height*4;
 364                 glt->totaltexels = size;
 365                 glt->texels[0] = qmalloc(size);
 366                 for (i = 1;i < MAXMIPS;i++)
 367                         glt->texels[i] = NULL;
 368         }
 369         if (!glt->texels[0])
 370                 Sys_Error("GL_AllocTexels: out of memory\n");
 371 }
 372
 373 // in can be the same as out
 374 void GL_MipReduce(byte *in, byte *out, int width, int height, int destwidth, int destheight)
 375 {
 376         int x, y, width2, height2, nextrow;
 377         if (width > destwidth)
 378         {
 379                 if (height > destheight)
 380                 {
 381                         // reduce both
 382                         width2 = width >> 1;
 383                         height2 = height >> 1;
 384                         nextrow = width << 2;
 385                         for (y = 0;y < height2;y++)
 386                         {
 387                                 for (x = 0;x < width2;x++)
 388                                 {
 389                                         out[0] = (byte) ((in[0] + in[4] + in[nextrow  ] + in[nextrow+4]) >> 2);
 390                                         out[1] = (byte) ((in[1] + in[5] + in[nextrow+1] + in[nextrow+5]) >> 2);
 391                                         out[2] = (byte) ((in[2] + in[6] + in[nextrow+2] + in[nextrow+6]) >> 2);
 392                                         out[3] = (byte) ((in[3] + in[7] + in[nextrow+3] + in[nextrow+7]) >> 2);
 393                                         out += 4;
 394                                         in += 8;
 395                                 }
 396                                 in += nextrow; // skip a line
 397                         }
 398                 }
 399                 else
 400                 {
 401                         // reduce width
 402                         width2 = width >> 1;
 403                         for (y = 0;y < height;y++)
 404                         {
 405                                 for (x = 0;x < width2;x++)
 406                                 {
 407                                         out[0] = (byte) ((in[0] + in[4]) >> 1);
 408                                         out[1] = (byte) ((in[1] + in[5]) >> 1);
 409                                         out[2] = (byte) ((in[2] + in[6]) >> 1);
 410                                         out[3] = (byte) ((in[3] + in[7]) >> 1);
 411                                         out += 4;
 412                                         in += 8;
 413                                 }
 414                         }
 415                 }
 416         }
 417         else
 418         {
 419                 if (height > destheight)
 420                 {
 421                         // reduce height
 422                         height2 = height >> 1;
 423                         nextrow = width << 2;
 424                         for (y = 0;y < height2;y++)
 425                         {
 426                                 for (x = 0;x < width;x++)
 427                                 {
 428                                         out[0] = (byte) ((in[0] + in[nextrow  ]) >> 1);
 429                                         out[1] = (byte) ((in[1] + in[nextrow+1]) >> 1);
 430                                         out[2] = (byte) ((in[2] + in[nextrow+2]) >> 1);
 431                                         out[3] = (byte) ((in[3] + in[nextrow+3]) >> 1);
 432                                         out += 4;
 433                                         in += 4;
 434                                 }
 435                                 in += nextrow; // skip a line
 436                         }
 437                 }
 438                 else
 439                         Sys_Error("GL_MipReduce: desired size already achieved\n");
 440         }
 441 }
 442
 443 void GL_UploadTexture (gltexture_t *glt)
 444 {
 445         int mip, width, height;
 446         if (!r_upload.value)
 447                 return;
 448         glBindTexture(GL_TEXTURE_2D, glt->texnum);
 449         width = glt->width;
 450         height = glt->height;
 451         for (mip = 0;mip < MAXMIPS && glt->texels[mip];mip++)
 452                 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]);
 453         if (glt->mipmap)
 454         {
 455                 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, gl_filter_min);
 456                 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, gl_filter_max);
 457         }
 458         else
 459         {
 460                 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, gl_filter_max);
 461                 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, gl_filter_max);
 462         }
 463         glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 464 }
 465
 466 /*
 467 ================
 468 GL_LoadTexture
 469 ================
 470 */
 471 int GL_LoadTexture (char *identifier, int width, int height, byte *data, qboolean mipmap, qboolean alpha, int bytesperpixel)
 472 {
 473         unsigned short  crc;
 474         int                             i, width2, height2, width3, height3, w, h, mip;
 475         gltexture_t             *glt;
 476
 477         if (isDedicated)
 478                 return 1;
 479
 480         // LordHavoc: do a CRC to confirm the data really is the same as previous occurances.
 481         crc = CRC_Block(data, width*height*bytesperpixel);
 482         // see if the texture is already present
 483         if (identifier[0])
 484         {
 485                 for (i=0, glt=gltextures ; i<numgltextures ; i++, glt++)
 486                 {
 487                         if (!strcmp (identifier, glt->identifier))
 488                         {
 489                                 // LordHavoc: everyone hates cache mismatchs, so I fixed it
 490                                 if (crc != glt->crc || width != glt->width || height != glt->height)
 491                                 {
 492                                         Con_DPrintf("GL_LoadTexture: cache mismatch, replacing old texture\n");
 493                                         goto GL_LoadTexture_setup; // drop out with glt pointing to the texture to replace
 494                                         //Sys_Error ("GL_LoadTexture: cache mismatch");
 495                                 }
 496                                 if ((gl_lerpimages.value != 0) != glt->lerped)
 497                                         goto GL_LoadTexture_setup; // drop out with glt pointing to the texture to replace
 498                                 return glt->texnum;
 499                         }
 500                 }
 501         }
 502         // LordHavoc: although this could be an else condition as it was in the original id code,
 503         //            it is more clear this way
 504         // LordHavoc: check if there are still slots available
 505         if (numgltextures >= MAX_GLTEXTURES)
 506                 Sys_Error ("GL_LoadTexture: ran out of texture slots (%d)\n", MAX_GLTEXTURES);
 507         glt = &gltextures[numgltextures++];
 508
 509         strcpy (glt->identifier, identifier);
 510         glt->texnum = texture_extension_number;
 511         texture_extension_number++;
 512 // LordHavoc: label to drop out of the loop into the setup code
 513 GL_LoadTexture_setup:
 514         // calculate power of 2 size
 515         width2 = 1;while (width2 < width) width2 <<= 1;
 516         height2 = 1;while (height2 < height) height2 <<= 1;
 517         // calculate final size (mipmapped downward to this)
 518         width3 = width2 >> (int) gl_picmip.value;
 519         height3 = height2 >> (int) gl_picmip.value;
 520         while (width3 > (int) gl_max_size.value) width3 >>= 1;
 521         while (height3 > (int) gl_max_size.value) height3 >>= 1;
 522         if (width3 < 1) width3 = 1;
 523         if (height3 < 1) height3 = 1;
 524
 525         // final storage
 526         GL_AllocTexels(glt, width3, height3, mipmap);
 527         glt->crc = crc; // LordHavoc: used to verify textures are identical
 528         glt->width = width;
 529         glt->height = height;
 530         glt->mipmap = mipmap;
 531         glt->bytesperpixel = bytesperpixel;
 532         glt->lerped = gl_lerpimages.value != 0;
 533         glt->alpha = false; // updated later
 534         if (width == width3 && height == height3) // perfect match
 535         {
 536                 if (bytesperpixel == 1) // 8bit
 537                         Image_Copy8bitRGBA(data, glt->texels[0], width*height, d_8to24table);
 538                 else
 539                         Image_CopyRGBAGamma(data, glt->texels[0], width*height);
 540         }
 541         else if (width == width2 && height == height2) // perfect match for top level, but needs to be reduced
 542         {
 543                 byte *temptexels2;
 544                 temptexels2 = qmalloc(width2*height2*4); // scaleup buffer
 545                 if (bytesperpixel == 1) // 8bit
 546                         Image_Copy8bitRGBA(data, temptexels2, width*height, d_8to24table);
 547                 else
 548                         Image_CopyRGBAGamma(data, temptexels2, width*height);
 549                 while (width2 > width3 || height2 > height3)
 550                 {
 551                         w = width2;h = height2;
 552                         if (width2 > width3) width2 >>= 1;
 553                         if (height2 > height3) height2 >>= 1;
 554                         if (width2 <= width3 && height2 <= height3) // size achieved
 555                                 GL_MipReduce(temptexels2, glt->texels[0], w, h, width3, height3);
 556                         else
 557                                 GL_MipReduce(temptexels2, temptexels2, w, h, width3, height3);
 558                 }
 559                 qfree(temptexels2);
 560         }
 561         else // scaling...
 562         {
 563                 byte *temptexels;
 564                 // pre-scaleup buffer
 565                 temptexels = qmalloc(width*height*4);
 566                 if (bytesperpixel == 1) // 8bit
 567                         Image_Copy8bitRGBA(data, temptexels, width*height, d_8to24table);
 568                 else
 569                         Image_CopyRGBAGamma(data, temptexels, width*height);
 570                 if (width2 != width3 || height2 != height3) // reduced by gl_pic_mip or gl_max_size
 571                 {
 572                         byte *temptexels2;
 573                         temptexels2 = qmalloc(width2*height2*4); // scaleup buffer
 574                         GL_ResampleTexture(temptexels, width, height, temptexels2, width2, height2);
 575                         while (width2 > width3 || height2 > height3)
 576                         {
 577                                 w = width2;h = height2;
 578                                 if (width2 > width3) width2 >>= 1;
 579                                 if (height2 > height3) height2 >>= 1;
 580                                 if (width2 <= width3 && height2 <= height3) // size achieved
 581                                         GL_MipReduce(temptexels2, glt->texels[0], w, h, width3, height3);
 582                                 else
 583                                         GL_MipReduce(temptexels2, temptexels2, w, h, width3, height3);
 584                         }
 585                         qfree(temptexels2);
 586                 }
 587                 else // copy directly
 588                         GL_ResampleTexture(temptexels, width, height, glt->texels[0], width2, height2);
 589                 qfree(temptexels);
 590         }
 591         if (alpha)
 592         {
 593                 byte    *in = glt->texels[0] + 3;
 594                 for (i = 0;i < width*height;i++, in += 4)
 595                         if (*in < 255)
 596                         {
 597                                 glt->alpha = true;
 598                                 break;
 599                         }
 600         }
 601         // this loop is skipped if there are no mipmaps to generate
 602         for (mip = 1;mip < MAXMIPS && glt->texels[mip];mip++)
 603                 GL_MipReduce(glt->texels[mip-1], glt->texels[mip], glt->texelsize[mip-1][0], glt->texelsize[mip-1][1], 1, 1);
 604         GL_UploadTexture(glt);
 605         GL_FreeTexels(glt);
 606
 607 //      if (bytesperpixel == 1) // 8bit
 608 //              GL_Upload8 (data, width, height, mipmap, alpha);
 609 //      else // 32bit
 610 //              GL_Upload32 (data, width, height, mipmap, true);
 611
 612         return glt->texnum;
 613 }
 614
 615 /*
 616 ================
 617 GL_LoadPicTexture
 618 ================
 619 */
 620 int GL_LoadPicTexture (qpic_t *pic)
 621 {
 622         return GL_LoadTexture ("", pic->width, pic->height, pic->data, false, true, 1);
 623 }
 624
 625 int GL_GetTextureSlots (int count)
 626 {
 627         gltexture_t             *glt, *first;
 628
 629         first = glt = &gltextures[numgltextures];
 630         while (count--)
 631         {
 632                 glt->identifier[0] = 0;
 633                 glt->texnum = texture_extension_number++;
 634                 glt->crc = 0;
 635                 glt->width = 0;
 636                 glt->height = 0;
 637                 glt->bytesperpixel = 0;
 638                 glt++;
 639                 numgltextures++;
 640         }
 641         return first->texnum;
 642 }