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, s = 0, sc = 0, 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                 if (glt->identifier[0] == '&')
 126                 {
 127                         sc++;
 128                         s += glt->totaltexels;
 129                 }
 130         }
 131         Con_Printf("%i textures, totalling %.3fMB, %i are (usually) unnecessary model skins totalling %.3fMB\n", numgltextures, t / 1048576.0, sc, s / 1048576.0);
 132 }
 133
 134 void GL_TextureStats_PrintTotal(void)
 135 {
 136         int i, s = 0, sc = 0, t = 0;
 137         gltexture_t *glt;
 138         for (i = 0, glt = gltextures;i < numgltextures;i++, glt++)
 139         {
 140                 t += glt->totaltexels;
 141                 if (glt->identifier[0] == '&')
 142                 {
 143                         sc++;
 144                         s += glt->totaltexels;
 145                 }
 146         }
 147         Con_Printf("%i textures, totalling %.3fMB, %i are (usually) unnecessary model skins totalling %.3fMB\n", numgltextures, t / 1048576.0, sc, s / 1048576.0);
 148 }
 149
 150 extern int buildnumber;
 151
 152 char engineversion[40];
 153
 154 void GL_UploadTexture (gltexture_t *glt);
 155 void gl_textures_start()
 156 {
 157         int i;
 158         gltexture_t *glt;
 159         for (i=0, glt=gltextures ; i<numgltextures ; i++, glt++)
 160                 GL_UploadTexture(glt);
 161 }
 162
 163 void gl_textures_shutdown()
 164 {
 165 }
 166
 167 void GL_Textures_Init (void)
 168 {
 169         Cmd_AddCommand("r_texturestats", GL_TextureStats_f);
 170         Cvar_RegisterVariable (&gl_max_size);
 171         Cvar_RegisterVariable (&gl_picmip);
 172         Cvar_RegisterVariable (&gl_lerpimages);
 173         Cvar_RegisterVariable (&r_upload);
 174 #ifdef NORENDER
 175         r_upload.value = 0;
 176 #endif
 177
 178         // 3dfx can only handle 256 wide textures
 179         if (!Q_strncasecmp ((char *)gl_renderer, "3dfx",4) || strstr((char *)gl_renderer, "Glide"))
 180                 Cvar_Set ("gl_max_size", "256");
 181
 182         Cmd_AddCommand ("gl_texturemode", &Draw_TextureMode_f);
 183
 184         R_RegisterModule("GL_Textures", gl_textures_start, gl_textures_shutdown);
 185 }
 186
 187 /*
 188 ================
 189 GL_FindTexture
 190 ================
 191 */
 192 int GL_FindTexture (char *identifier)
 193 {
 194         int             i;
 195         gltexture_t     *glt;
 196
 197         for (i=0, glt=gltextures ; i<numgltextures ; i++, glt++)
 198         {
 199                 if (!strcmp (identifier, glt->identifier))
 200                         return gltextures[i].texnum;
 201         }
 202
 203         return -1;
 204 }
 205
 206 void GL_ResampleTextureLerpLine (byte *in, byte *out, int inwidth, int outwidth)
 207 {
 208         int             j, xi, oldx = 0, f, fstep, l1, l2, endx;
 209         fstep = (int) (inwidth*65536.0f/outwidth);
 210         endx = (inwidth-1);
 211         for (j = 0,f = 0;j < outwidth;j++, f += fstep)
 212         {
 213                 xi = (int) f >> 16;
 214                 if (xi != oldx)
 215                 {
 216                         in += (xi - oldx) * 4;
 217                         oldx = xi;
 218                 }
 219                 if (xi < endx)
 220                 {
 221                         l2 = f & 0xFFFF;
 222                         l1 = 0x10000 - l2;
 223                         *out++ = (byte) ((in[0] * l1 + in[4] * l2) >> 16);
 224                         *out++ = (byte) ((in[1] * l1 + in[5] * l2) >> 16);
 225                         *out++ = (byte) ((in[2] * l1 + in[6] * l2) >> 16);
 226                         *out++ = (byte) ((in[3] * l1 + in[7] * l2) >> 16);
 227                 }
 228                 else // last pixel of the line has no pixel to lerp to
 229                 {
 230                         *out++ = in[0];
 231                         *out++ = in[1];
 232                         *out++ = in[2];
 233                         *out++ = in[3];
 234                 }
 235         }
 236 }
 237
 238 /*
 239 ================
 240 GL_ResampleTexture
 241 ================
 242 */
 243 void GL_ResampleTexture (void *indata, int inwidth, int inheight, void *outdata,  int outwidth, int outheight)
 244 {
 245         if (gl_lerpimages.value)
 246         {
 247                 int             i, j, yi, oldy, f, fstep, l1, l2, endy = (inheight-1);
 248                 byte    *inrow, *out, *row1, *row2;
 249                 out = outdata;
 250                 fstep = (int) (inheight*65536.0f/outheight);
 251
 252                 row1 = qmalloc(outwidth*4);
 253                 row2 = qmalloc(outwidth*4);
 254                 inrow = indata;
 255                 oldy = 0;
 256                 GL_ResampleTextureLerpLine (inrow, row1, inwidth, outwidth);
 257                 GL_ResampleTextureLerpLine (inrow + inwidth*4, row2, inwidth, outwidth);
 258                 for (i = 0, f = 0;i < outheight;i++,f += fstep)
 259                 {
 260                         yi = f >> 16;
 261                         if (yi != oldy)
 262                         {
 263                                 inrow = (byte *)indata + inwidth*4*yi;
 264                                 if (yi == oldy+1)
 265                                         memcpy(row1, row2, outwidth*4);
 266                                 else
 267                                         GL_ResampleTextureLerpLine (inrow, row1, inwidth, outwidth);
 268                                 if (yi < endy)
 269                                         GL_ResampleTextureLerpLine (inrow + inwidth*4, row2, inwidth, outwidth);
 270                                 else
 271                                         memcpy(row2, row1, outwidth*4);
 272                                 oldy = yi;
 273                         }
 274                         if (yi < endy)
 275                         {
 276                                 l2 = f & 0xFFFF;
 277                                 l1 = 0x10000 - l2;
 278                                 for (j = 0;j < outwidth;j++)
 279                                 {
 280                                         *out++ = (byte) ((*row1++ * l1 + *row2++ * l2) >> 16);
 281                                         *out++ = (byte) ((*row1++ * l1 + *row2++ * l2) >> 16);
 282                                         *out++ = (byte) ((*row1++ * l1 + *row2++ * l2) >> 16);
 283                                         *out++ = (byte) ((*row1++ * l1 + *row2++ * l2) >> 16);
 284                                 }
 285                                 row1 -= outwidth*4;
 286                                 row2 -= outwidth*4;
 287                         }
 288                         else // last line has no pixels to lerp to
 289                         {
 290                                 for (j = 0;j < outwidth;j++)
 291                                 {
 292                                         *out++ = *row1++;
 293                                         *out++ = *row1++;
 294                                         *out++ = *row1++;
 295                                         *out++ = *row1++;
 296                                 }
 297                                 row1 -= outwidth*4;
 298                         }
 299                 }
 300                 qfree(row1);
 301                 qfree(row2);
 302         }
 303         else
 304         {
 305                 int             i, j;
 306                 unsigned        frac, fracstep;
 307                 byte    *inrow, *out, *inpix;
 308                 out = outdata;
 309
 310                 fracstep = inwidth*0x10000/outwidth;
 311                 for (i=0 ; i<outheight ; i++)
 312                 {
 313                         inrow = (byte *)indata + inwidth*(i*inheight/outheight)*4;
 314                         frac = fracstep >> 1;
 315                         for (j=0 ; j<outwidth ; j+=4)
 316                         {
 317                                 inpix = inrow + ((frac >> 14) & ~3);*out++ = qgamma[*inpix++];*out++ = qgamma[*inpix++];*out++ = qgamma[*inpix++];*out++ =       *inpix++ ;frac += fracstep;
 318                                 inpix = inrow + ((frac >> 14) & ~3);*out++ = qgamma[*inpix++];*out++ = qgamma[*inpix++];*out++ = qgamma[*inpix++];*out++ =       *inpix++ ;frac += fracstep;
 319                                 inpix = inrow + ((frac >> 14) & ~3);*out++ = qgamma[*inpix++];*out++ = qgamma[*inpix++];*out++ = qgamma[*inpix++];*out++ =       *inpix++ ;frac += fracstep;
 320                                 inpix = inrow + ((frac >> 14) & ~3);*out++ = qgamma[*inpix++];*out++ = qgamma[*inpix++];*out++ = qgamma[*inpix++];*out++ =       *inpix++ ;frac += fracstep;
 321                         }
 322                 }
 323         }
 324 }
 325
 326 void GL_FreeTexels(gltexture_t *glt)
 327 {
 328         if (glt->texels[0])
 329                 qfree(glt->texels[0]);
 330         glt->texels[0] = 0;
 331 }
 332
 333 void GL_AllocTexels(gltexture_t *glt, int width, int height, int mipmapped)
 334 {
 335         int i, w, h, size, done;
 336         if (glt->texels[0])
 337                 GL_FreeTexels(glt);
 338         glt->texelsize[0][0] = width;
 339         glt->texelsize[0][1] = height;
 340         if (mipmapped)
 341         {
 342                 size = 0;
 343                 w = width;h = height;
 344                 i = 0;
 345                 done = false;
 346                 for (i = 0;i < MAXMIPS;i++)
 347                 {
 348                         glt->texelsize[i][0] = w;
 349                         glt->texelsize[i][1] = h;
 350                         glt->texels[i] = (void *)size;
 351                         size += w*h*4;
 352                         if (w > 1)
 353                         {
 354                                 w >>= 1;
 355                                 if (h > 1)
 356                                         h >>= 1;
 357                         }
 358                         else if (h > 1)
 359                                 h >>= 1;
 360                         else
 361                         {
 362                                 i++;
 363                                 break;
 364                         }
 365                 }
 366                 glt->totaltexels = size;
 367                 while (i < MAXMIPS)
 368                         glt->texels[i++] = NULL;
 369                 glt->texels[0] = qmalloc(size);
 370                 for (i = 1;i < MAXMIPS && glt->texels[i];i++)
 371                         glt->texels[i] += (int) glt->texels[0];
 372         }
 373         else
 374         {
 375                 size = width*height*4;
 376                 glt->totaltexels = size;
 377                 glt->texels[0] = qmalloc(size);
 378                 for (i = 1;i < MAXMIPS;i++)
 379                         glt->texels[i] = NULL;
 380         }
 381         if (!glt->texels[0])
 382                 Sys_Error("GL_AllocTexels: out of memory\n");
 383 }
 384
 385 // in can be the same as out
 386 void GL_MipReduce(byte *in, byte *out, int width, int height, int destwidth, int destheight)
 387 {
 388         int x, y, width2, height2, nextrow;
 389         if (width > destwidth)
 390         {
 391                 if (height > destheight)
 392                 {
 393                         // reduce both
 394                         width2 = width >> 1;
 395                         height2 = height >> 1;
 396                         nextrow = width << 2;
 397                         for (y = 0;y < height2;y++)
 398                         {
 399                                 for (x = 0;x < width2;x++)
 400                                 {
 401                                         out[0] = (byte) ((in[0] + in[4] + in[nextrow  ] + in[nextrow+4]) >> 2);
 402                                         out[1] = (byte) ((in[1] + in[5] + in[nextrow+1] + in[nextrow+5]) >> 2);
 403                                         out[2] = (byte) ((in[2] + in[6] + in[nextrow+2] + in[nextrow+6]) >> 2);
 404                                         out[3] = (byte) ((in[3] + in[7] + in[nextrow+3] + in[nextrow+7]) >> 2);
 405                                         out += 4;
 406                                         in += 8;
 407                                 }
 408                                 in += nextrow; // skip a line
 409                         }
 410                 }
 411                 else
 412                 {
 413                         // reduce width
 414                         width2 = width >> 1;
 415                         for (y = 0;y < height;y++)
 416                         {
 417                                 for (x = 0;x < width2;x++)
 418                                 {
 419                                         out[0] = (byte) ((in[0] + in[4]) >> 1);
 420                                         out[1] = (byte) ((in[1] + in[5]) >> 1);
 421                                         out[2] = (byte) ((in[2] + in[6]) >> 1);
 422                                         out[3] = (byte) ((in[3] + in[7]) >> 1);
 423                                         out += 4;
 424                                         in += 8;
 425                                 }
 426                         }
 427                 }
 428         }
 429         else
 430         {
 431                 if (height > destheight)
 432                 {
 433                         // reduce height
 434                         height2 = height >> 1;
 435                         nextrow = width << 2;
 436                         for (y = 0;y < height2;y++)
 437                         {
 438                                 for (x = 0;x < width;x++)
 439                                 {
 440                                         out[0] = (byte) ((in[0] + in[nextrow  ]) >> 1);
 441                                         out[1] = (byte) ((in[1] + in[nextrow+1]) >> 1);
 442                                         out[2] = (byte) ((in[2] + in[nextrow+2]) >> 1);
 443                                         out[3] = (byte) ((in[3] + in[nextrow+3]) >> 1);
 444                                         out += 4;
 445                                         in += 4;
 446                                 }
 447                                 in += nextrow; // skip a line
 448                         }
 449                 }
 450                 else
 451                         Sys_Error("GL_MipReduce: desired size already achieved\n");
 452         }
 453 }
 454
 455 void GL_UploadTexture (gltexture_t *glt)
 456 {
 457         int mip, width, height;
 458         if (!r_upload.value)
 459                 return;
 460         glBindTexture(GL_TEXTURE_2D, glt->texnum);
 461         width = glt->width;
 462         height = glt->height;
 463         for (mip = 0;mip < MAXMIPS && glt->texels[mip];mip++)
 464                 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]);
 465         if (glt->mipmap)
 466         {
 467                 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, gl_filter_min);
 468                 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, gl_filter_max);
 469         }
 470         else
 471         {
 472                 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, gl_filter_max);
 473                 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, gl_filter_max);
 474         }
 475         glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 476 }
 477
 478 /*
 479 ================
 480 GL_LoadTexture
 481 ================
 482 */
 483 int GL_LoadTexture (char *identifier, int width, int height, byte *data, qboolean mipmap, qboolean alpha, int bytesperpixel)
 484 {
 485         unsigned short  crc;
 486         int                             i, width2, height2, width3, height3, w, h, mip;
 487         gltexture_t             *glt;
 488
 489         if (isDedicated)
 490                 return 1;
 491
 492         // LordHavoc: do a CRC to confirm the data really is the same as previous occurances.
 493         crc = CRC_Block(data, width*height*bytesperpixel);
 494         // see if the texture is already present
 495         if (identifier[0])
 496         {
 497                 for (i=0, glt=gltextures ; i<numgltextures ; i++, glt++)
 498                 {
 499                         if (!strcmp (identifier, glt->identifier))
 500                         {
 501                                 // LordHavoc: everyone hates cache mismatchs, so I fixed it
 502                                 if (crc != glt->crc || width != glt->width || height != glt->height)
 503                                 {
 504                                         Con_DPrintf("GL_LoadTexture: cache mismatch, replacing old texture\n");
 505                                         goto GL_LoadTexture_setup; // drop out with glt pointing to the texture to replace
 506                                         //Sys_Error ("GL_LoadTexture: cache mismatch");
 507                                 }
 508                                 if ((gl_lerpimages.value != 0) != glt->lerped)
 509                                         goto GL_LoadTexture_setup; // drop out with glt pointing to the texture to replace
 510                                 return glt->texnum;
 511                         }
 512                 }
 513         }
 514         // LordHavoc: although this could be an else condition as it was in the original id code,
 515         //            it is more clear this way
 516         // LordHavoc: check if there are still slots available
 517         if (numgltextures >= MAX_GLTEXTURES)
 518                 Sys_Error ("GL_LoadTexture: ran out of texture slots (%d)\n", MAX_GLTEXTURES);
 519         glt = &gltextures[numgltextures++];
 520
 521         strcpy (glt->identifier, identifier);
 522         glt->texnum = texture_extension_number;
 523         texture_extension_number++;
 524 // LordHavoc: label to drop out of the loop into the setup code
 525 GL_LoadTexture_setup:
 526         // calculate power of 2 size
 527         width2 = 1;while (width2 < width) width2 <<= 1;
 528         height2 = 1;while (height2 < height) height2 <<= 1;
 529         // calculate final size (mipmapped downward to this)
 530         width3 = width2 >> (int) gl_picmip.value;
 531         height3 = height2 >> (int) gl_picmip.value;
 532         while (width3 > (int) gl_max_size.value) width3 >>= 1;
 533         while (height3 > (int) gl_max_size.value) height3 >>= 1;
 534         if (width3 < 1) width3 = 1;
 535         if (height3 < 1) height3 = 1;
 536
 537         // final storage
 538         GL_AllocTexels(glt, width3, height3, mipmap);
 539         glt->crc = crc; // LordHavoc: used to verify textures are identical
 540         glt->width = width;
 541         glt->height = height;
 542         glt->mipmap = mipmap;
 543         glt->bytesperpixel = bytesperpixel;
 544         glt->lerped = gl_lerpimages.value != 0;
 545         glt->alpha = false; // updated later
 546         if (width == width3 && height == height3) // perfect match
 547         {
 548                 if (bytesperpixel == 1) // 8bit
 549                         Image_Copy8bitRGBA(data, glt->texels[0], width*height, d_8to24table);
 550                 else
 551                         Image_CopyRGBAGamma(data, glt->texels[0], width*height);
 552         }
 553         else if (width == width2 && height == height2) // perfect match for top level, but needs to be reduced
 554         {
 555                 byte *temptexels2;
 556                 temptexels2 = qmalloc(width2*height2*4); // scaleup buffer
 557                 if (bytesperpixel == 1) // 8bit
 558                         Image_Copy8bitRGBA(data, temptexels2, width*height, d_8to24table);
 559                 else
 560                         Image_CopyRGBAGamma(data, temptexels2, width*height);
 561                 while (width2 > width3 || height2 > height3)
 562                 {
 563                         w = width2;h = height2;
 564                         if (width2 > width3) width2 >>= 1;
 565                         if (height2 > height3) height2 >>= 1;
 566                         if (width2 <= width3 && height2 <= height3) // size achieved
 567                                 GL_MipReduce(temptexels2, glt->texels[0], w, h, width3, height3);
 568                         else
 569                                 GL_MipReduce(temptexels2, temptexels2, w, h, width3, height3);
 570                 }
 571                 qfree(temptexels2);
 572         }
 573         else // scaling...
 574         {
 575                 byte *temptexels;
 576                 // pre-scaleup buffer
 577                 temptexels = qmalloc(width*height*4);
 578                 if (bytesperpixel == 1) // 8bit
 579                         Image_Copy8bitRGBA(data, temptexels, width*height, d_8to24table);
 580                 else
 581                         Image_CopyRGBAGamma(data, temptexels, width*height);
 582                 if (width2 != width3 || height2 != height3) // reduced by gl_pic_mip or gl_max_size
 583                 {
 584                         byte *temptexels2;
 585                         temptexels2 = qmalloc(width2*height2*4); // scaleup buffer
 586                         GL_ResampleTexture(temptexels, width, height, temptexels2, width2, height2);
 587                         while (width2 > width3 || height2 > height3)
 588                         {
 589                                 w = width2;h = height2;
 590                                 if (width2 > width3) width2 >>= 1;
 591                                 if (height2 > height3) height2 >>= 1;
 592                                 if (width2 <= width3 && height2 <= height3) // size achieved
 593                                         GL_MipReduce(temptexels2, glt->texels[0], w, h, width3, height3);
 594                                 else
 595                                         GL_MipReduce(temptexels2, temptexels2, w, h, width3, height3);
 596                         }
 597                         qfree(temptexels2);
 598                 }
 599                 else // copy directly
 600                         GL_ResampleTexture(temptexels, width, height, glt->texels[0], width2, height2);
 601                 qfree(temptexels);
 602         }
 603         if (alpha)
 604         {
 605                 byte    *in = glt->texels[0] + 3;
 606                 for (i = 0;i < width*height;i++, in += 4)
 607                         if (*in < 255)
 608                         {
 609                                 glt->alpha = true;
 610                                 break;
 611                         }
 612         }
 613         // this loop is skipped if there are no mipmaps to generate
 614         for (mip = 1;mip < MAXMIPS && glt->texels[mip];mip++)
 615                 GL_MipReduce(glt->texels[mip-1], glt->texels[mip], glt->texelsize[mip-1][0], glt->texelsize[mip-1][1], 1, 1);
 616         GL_UploadTexture(glt);
 617         GL_FreeTexels(glt);
 618
 619 //      if (bytesperpixel == 1) // 8bit
 620 //              GL_Upload8 (data, width, height, mipmap, alpha);
 621 //      else // 32bit
 622 //              GL_Upload32 (data, width, height, mipmap, true);
 623
 624         return glt->texnum;
 625 }
 626
 627 /*
 628 ================
 629 GL_LoadPicTexture
 630 ================
 631 */
 632 int GL_LoadPicTexture (qpic_t *pic)
 633 {
 634         return GL_LoadTexture ("", pic->width, pic->height, pic->data, false, true, 1);
 635 }
 636
 637 int GL_GetTextureSlots (int count)
 638 {
 639         gltexture_t             *glt, *first;
 640
 641         first = glt = &gltextures[numgltextures];
 642         while (count--)
 643         {
 644                 glt->identifier[0] = 0;
 645                 glt->texnum = texture_extension_number++;
 646                 glt->crc = 0;
 647                 glt->width = 0;
 648                 glt->height = 0;
 649                 glt->bytesperpixel = 0;
 650                 glt++;
 651                 numgltextures++;
 652         }
 653         return first->texnum;
 654 }