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             texeldatasize;
  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         // no need to pad since the name was moved to last
 111 //      while (c < 28)
 112 //              n[c++] = ' ';
 113         n[c] = 0;
 114         Con_Printf("%5i %04X %s %s %s\n", total, crc, mip ? "yes" : "no ", alpha ? "yes  " : "no   ", n);
 115 }
 116
 117 void GL_TextureStats_f(void)
 118 {
 119         int i, s = 0, sc = 0, t = 0;
 120         gltexture_t *glt;
 121         Con_Printf("kbytes crc  mip alpha name\n");
 122         for (i = 0, glt = gltextures;i < numgltextures;i++, glt++)
 123         {
 124                 GL_TextureStats_Print(glt->identifier, (glt->texeldatasize + 512) >> 10, glt->crc, glt->mipmap, glt->alpha);
 125                 t += glt->texeldatasize;
 126                 if (glt->identifier[0] == '&')
 127                 {
 128                         sc++;
 129                         s += glt->texeldatasize;
 130                 }
 131         }
 132         Con_Printf("%i textures, totalling %.3fMB, %i are (usually) unnecessary model skins totalling %.3fMB\n", numgltextures, t / 1048576.0, sc, s / 1048576.0);
 133 }
 134
 135 void GL_TextureStats_PrintTotal(void)
 136 {
 137         int i, s = 0, sc = 0, t = 0;
 138         gltexture_t *glt;
 139         for (i = 0, glt = gltextures;i < numgltextures;i++, glt++)
 140         {
 141                 t += glt->texeldatasize;
 142                 if (glt->identifier[0] == '&')
 143                 {
 144                         sc++;
 145                         s += glt->texeldatasize;
 146                 }
 147         }
 148         Con_Printf("%i textures, totalling %.3fMB, %i are (usually) unnecessary model skins totalling %.3fMB\n", numgltextures, t / 1048576.0, sc, s / 1048576.0);
 149 }
 150
 151 char engineversion[40];
 152
 153 void GL_UploadTexture (gltexture_t *glt);
 154 void gl_textures_start()
 155 {
 156         int i;
 157         gltexture_t *glt;
 158         for (i=0, glt=gltextures ; i<numgltextures ; i++, glt++)
 159                 GL_UploadTexture(glt);
 160 }
 161
 162 void gl_textures_shutdown()
 163 {
 164 }
 165
 166 void GL_Textures_Init (void)
 167 {
 168         Cmd_AddCommand("r_texturestats", GL_TextureStats_f);
 169         Cvar_RegisterVariable (&gl_max_size);
 170         Cvar_RegisterVariable (&gl_picmip);
 171         Cvar_RegisterVariable (&gl_lerpimages);
 172         Cvar_RegisterVariable (&r_upload);
 173 #ifdef NORENDER
 174         r_upload.value = 0;
 175 #endif
 176
 177         // 3dfx can only handle 256 wide textures
 178         if (!Q_strncasecmp ((char *)gl_renderer, "3dfx",4) || strstr((char *)gl_renderer, "Glide"))
 179                 Cvar_Set ("gl_max_size", "256");
 180
 181         Cmd_AddCommand ("gl_texturemode", &Draw_TextureMode_f);
 182
 183         R_RegisterModule("GL_Textures", gl_textures_start, gl_textures_shutdown);
 184 }
 185
 186 /*
 187 ================
 188 GL_FindTexture
 189 ================
 190 */
 191 int GL_FindTexture (char *identifier)
 192 {
 193         int             i;
 194         gltexture_t     *glt;
 195
 196         for (i=0, glt=gltextures ; i<numgltextures ; i++, glt++)
 197         {
 198                 if (!strcmp (identifier, glt->identifier))
 199                         return gltextures[i].texnum;
 200         }
 201
 202         return -1;
 203 }
 204
 205 void GL_ResampleTextureLerpLine (byte *in, byte *out, int inwidth, int outwidth)
 206 {
 207         int             j, xi, oldx = 0, f, fstep, l1, l2, endx;
 208         fstep = (int) (inwidth*65536.0f/outwidth);
 209         endx = (inwidth-1);
 210         for (j = 0,f = 0;j < outwidth;j++, f += fstep)
 211         {
 212                 xi = (int) f >> 16;
 213                 if (xi != oldx)
 214                 {
 215                         in += (xi - oldx) * 4;
 216                         oldx = xi;
 217                 }
 218                 if (xi < endx)
 219                 {
 220                         l2 = f & 0xFFFF;
 221                         l1 = 0x10000 - l2;
 222                         *out++ = (byte) ((in[0] * l1 + in[4] * l2) >> 16);
 223                         *out++ = (byte) ((in[1] * l1 + in[5] * l2) >> 16);
 224                         *out++ = (byte) ((in[2] * l1 + in[6] * l2) >> 16);
 225                         *out++ = (byte) ((in[3] * l1 + in[7] * l2) >> 16);
 226                 }
 227                 else // last pixel of the line has no pixel to lerp to
 228                 {
 229                         *out++ = in[0];
 230                         *out++ = in[1];
 231                         *out++ = in[2];
 232                         *out++ = in[3];
 233                 }
 234         }
 235 }
 236
 237 /*
 238 ================
 239 GL_ResampleTexture
 240 ================
 241 */
 242 void GL_ResampleTexture (void *indata, int inwidth, int inheight, void *outdata,  int outwidth, int outheight)
 243 {
 244         if (gl_lerpimages.value)
 245         {
 246                 int             i, j, yi, oldy, f, fstep, l1, l2, endy = (inheight-1);
 247                 byte    *inrow, *out, *row1, *row2;
 248                 out = outdata;
 249                 fstep = (int) (inheight*65536.0f/outheight);
 250
 251                 row1 = qmalloc(outwidth*4);
 252                 row2 = qmalloc(outwidth*4);
 253                 inrow = indata;
 254                 oldy = 0;
 255                 GL_ResampleTextureLerpLine (inrow, row1, inwidth, outwidth);
 256                 GL_ResampleTextureLerpLine (inrow + inwidth*4, row2, inwidth, outwidth);
 257                 for (i = 0, f = 0;i < outheight;i++,f += fstep)
 258                 {
 259                         yi = f >> 16;
 260                         if (yi != oldy)
 261                         {
 262                                 inrow = (byte *)indata + inwidth*4*yi;
 263                                 if (yi == oldy+1)
 264                                         memcpy(row1, row2, outwidth*4);
 265                                 else
 266                                         GL_ResampleTextureLerpLine (inrow, row1, inwidth, outwidth);
 267                                 if (yi < endy)
 268                                         GL_ResampleTextureLerpLine (inrow + inwidth*4, row2, inwidth, outwidth);
 269                                 else
 270                                         memcpy(row2, row1, outwidth*4);
 271                                 oldy = yi;
 272                         }
 273                         if (yi < endy)
 274                         {
 275                                 l2 = f & 0xFFFF;
 276                                 l1 = 0x10000 - l2;
 277                                 for (j = 0;j < outwidth;j++)
 278                                 {
 279                                         *out++ = (byte) ((*row1++ * l1 + *row2++ * l2) >> 16);
 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                                 }
 284                                 row1 -= outwidth*4;
 285                                 row2 -= outwidth*4;
 286                         }
 287                         else // last line has no pixels to lerp to
 288                         {
 289                                 for (j = 0;j < outwidth;j++)
 290                                 {
 291                                         *out++ = *row1++;
 292                                         *out++ = *row1++;
 293                                         *out++ = *row1++;
 294                                         *out++ = *row1++;
 295                                 }
 296                                 row1 -= outwidth*4;
 297                         }
 298                 }
 299                 qfree(row1);
 300                 qfree(row2);
 301         }
 302         else
 303         {
 304                 int             i, j;
 305                 unsigned        frac, fracstep;
 306                 byte    *inrow, *out, *inpix;
 307                 out = outdata;
 308
 309                 fracstep = inwidth*0x10000/outwidth;
 310                 for (i=0 ; i<outheight ; i++)
 311                 {
 312                         inrow = (byte *)indata + inwidth*(i*inheight/outheight)*4;
 313                         frac = fracstep >> 1;
 314                         for (j=0 ; j<outwidth ; j+=4)
 315                         {
 316                                 inpix = inrow + ((frac >> 14) & ~3);*out++ = qgamma[*inpix++];*out++ = qgamma[*inpix++];*out++ = qgamma[*inpix++];*out++ =       *inpix++ ;frac += fracstep;
 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                         }
 321                 }
 322         }
 323 }
 324
 325 void GL_FreeTexels(gltexture_t *glt)
 326 {
 327         if (glt->texels[0])
 328                 qfree(glt->texels[0]);
 329         glt->texels[0] = 0;
 330 }
 331
 332 void GL_AllocTexels(gltexture_t *glt, int width, int height, int mipmapped)
 333 {
 334         int i, w, h, size;
 335         if (glt->texels[0])
 336                 GL_FreeTexels(glt);
 337         glt->texelsize[0][0] = width;
 338         glt->texelsize[0][1] = height;
 339         if (mipmapped)
 340         {
 341                 size = 0;
 342                 w = width;h = height;
 343                 i = 0;
 344                 while (i < MAXMIPS)
 345                 {
 346                         glt->texelsize[i][0] = w;
 347                         glt->texelsize[i][1] = h;
 348                         glt->texels[i++] = (void *)size;
 349                         size += w*h*4;
 350                         if (w > 1)
 351                         {
 352                                 w >>= 1;
 353                                 if (h > 1)
 354                                         h >>= 1;
 355                         }
 356                         else if (h > 1)
 357                                 h >>= 1;
 358                         else
 359                                 break;
 360                 }
 361                 glt->texeldatasize = size;
 362                 while (i < MAXMIPS)
 363                         glt->texels[i++] = NULL;
 364                 glt->texels[0] = qmalloc(size);
 365                 for (i = 1;i < MAXMIPS && glt->texels[i];i++)
 366                         glt->texels[i] += (int) glt->texels[0];
 367         }
 368         else
 369         {
 370                 size = width*height*4;
 371                 glt->texeldatasize = size;
 372                 glt->texels[0] = qmalloc(size);
 373                 for (i = 1;i < MAXMIPS;i++)
 374                         glt->texels[i] = NULL;
 375         }
 376         if (!glt->texels[0])
 377                 Sys_Error("GL_AllocTexels: out of memory\n");
 378 }
 379
 380 // in can be the same as out
 381 void GL_MipReduce(byte *in, byte *out, int width, int height, int destwidth, int destheight)
 382 {
 383         int x, y, width2, height2, nextrow;
 384         if (width > destwidth)
 385         {
 386                 if (height > destheight)
 387                 {
 388                         // reduce both
 389                         width2 = width >> 1;
 390                         height2 = height >> 1;
 391                         nextrow = width << 2;
 392                         for (y = 0;y < height2;y++)
 393                         {
 394                                 for (x = 0;x < width2;x++)
 395                                 {
 396                                         out[0] = (byte) ((in[0] + in[4] + in[nextrow  ] + in[nextrow+4]) >> 2);
 397                                         out[1] = (byte) ((in[1] + in[5] + in[nextrow+1] + in[nextrow+5]) >> 2);
 398                                         out[2] = (byte) ((in[2] + in[6] + in[nextrow+2] + in[nextrow+6]) >> 2);
 399                                         out[3] = (byte) ((in[3] + in[7] + in[nextrow+3] + in[nextrow+7]) >> 2);
 400                                         out += 4;
 401                                         in += 8;
 402                                 }
 403                                 in += nextrow; // skip a line
 404                         }
 405                 }
 406                 else
 407                 {
 408                         // reduce width
 409                         width2 = width >> 1;
 410                         for (y = 0;y < height;y++)
 411                         {
 412                                 for (x = 0;x < width2;x++)
 413                                 {
 414                                         out[0] = (byte) ((in[0] + in[4]) >> 1);
 415                                         out[1] = (byte) ((in[1] + in[5]) >> 1);
 416                                         out[2] = (byte) ((in[2] + in[6]) >> 1);
 417                                         out[3] = (byte) ((in[3] + in[7]) >> 1);
 418                                         out += 4;
 419                                         in += 8;
 420                                 }
 421                         }
 422                 }
 423         }
 424         else
 425         {
 426                 if (height > destheight)
 427                 {
 428                         // reduce height
 429                         height2 = height >> 1;
 430                         nextrow = width << 2;
 431                         for (y = 0;y < height2;y++)
 432                         {
 433                                 for (x = 0;x < width;x++)
 434                                 {
 435                                         out[0] = (byte) ((in[0] + in[nextrow  ]) >> 1);
 436                                         out[1] = (byte) ((in[1] + in[nextrow+1]) >> 1);
 437                                         out[2] = (byte) ((in[2] + in[nextrow+2]) >> 1);
 438                                         out[3] = (byte) ((in[3] + in[nextrow+3]) >> 1);
 439                                         out += 4;
 440                                         in += 4;
 441                                 }
 442                                 in += nextrow; // skip a line
 443                         }
 444                 }
 445                 else
 446                         Sys_Error("GL_MipReduce: desired size already achieved\n");
 447         }
 448 }
 449
 450 void GL_UploadTexture (gltexture_t *glt)
 451 {
 452         int mip, width, height;
 453         if (!r_upload.value)
 454                 return;
 455         glBindTexture(GL_TEXTURE_2D, glt->texnum);
 456         width = glt->width;
 457         height = glt->height;
 458         for (mip = 0;mip < MAXMIPS && glt->texels[mip];mip++)
 459                 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]);
 460         if (glt->mipmap)
 461         {
 462                 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, gl_filter_min);
 463                 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, gl_filter_max);
 464         }
 465         else
 466         {
 467                 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, gl_filter_max);
 468                 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, gl_filter_max);
 469         }
 470         glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 471 }
 472
 473 /*
 474 ================
 475 GL_LoadTexture
 476 ================
 477 */
 478 int GL_LoadTexture (char *identifier, int width, int height, byte *data, qboolean mipmap, qboolean alpha, int bytesperpixel)
 479 {
 480         unsigned short  crc;
 481         int                             i, width2, height2, width3, height3, w, h, mip;
 482         gltexture_t             *glt;
 483
 484         if (isDedicated)
 485                 return 1;
 486
 487         // LordHavoc: do a CRC to confirm the data really is the same as previous occurances.
 488         crc = CRC_Block(data, width*height*bytesperpixel);
 489         // see if the texture is already present
 490         if (identifier[0])
 491         {
 492                 for (i=0, glt=gltextures ; i<numgltextures ; i++, glt++)
 493                 {
 494                         if (!strcmp (identifier, glt->identifier))
 495                         {
 496                                 // LordHavoc: everyone hates cache mismatchs, so I fixed it
 497                                 if (crc != glt->crc || width != glt->width || height != glt->height)
 498                                 {
 499                                         Con_DPrintf("GL_LoadTexture: cache mismatch, replacing old texture\n");
 500                                         goto GL_LoadTexture_setup; // drop out with glt pointing to the texture to replace
 501                                 }
 502                                 if ((gl_lerpimages.value != 0) != glt->lerped)
 503                                         goto GL_LoadTexture_setup; // drop out with glt pointing to the texture to replace
 504                                 return glt->texnum;
 505                         }
 506                 }
 507         }
 508         // LordHavoc: although this could be an else condition as it was in the original id code,
 509         //            it is more clear this way
 510         // LordHavoc: check if there are still slots available
 511         if (numgltextures >= MAX_GLTEXTURES)
 512                 Sys_Error ("GL_LoadTexture: ran out of texture slots (%d)\n", MAX_GLTEXTURES);
 513         glt = &gltextures[numgltextures++];
 514
 515         strcpy (glt->identifier, identifier);
 516         glt->texnum = texture_extension_number;
 517         texture_extension_number++;
 518 // LordHavoc: label to drop out of the loop into the setup code
 519 GL_LoadTexture_setup:
 520         // calculate power of 2 size
 521         width2 = 1;while (width2 < width) width2 <<= 1;
 522         height2 = 1;while (height2 < height) height2 <<= 1;
 523         // calculate final size (mipmapped downward to this)
 524         width3 = width2 >> (int) gl_picmip.value;
 525         height3 = height2 >> (int) gl_picmip.value;
 526         while (width3 > (int) gl_max_size.value) width3 >>= 1;
 527         while (height3 > (int) gl_max_size.value) height3 >>= 1;
 528         if (width3 < 1) width3 = 1;
 529         if (height3 < 1) height3 = 1;
 530
 531         // final storage
 532         GL_AllocTexels(glt, width3, height3, mipmap);
 533         glt->crc = crc; // LordHavoc: used to verify textures are identical
 534         glt->width = width;
 535         glt->height = height;
 536         glt->mipmap = mipmap;
 537         glt->bytesperpixel = bytesperpixel;
 538         glt->lerped = gl_lerpimages.value != 0;
 539         glt->alpha = false; // updated later
 540         if (width == width3 && height == height3) // perfect match
 541         {
 542                 if (bytesperpixel == 1) // 8bit
 543                         Image_Copy8bitRGBA(data, glt->texels[0], width*height, d_8to24table);
 544                 else
 545                         Image_CopyRGBAGamma(data, glt->texels[0], width*height);
 546         }
 547         else if (width == width2 && height == height2) // perfect match for top level, but needs to be reduced
 548         {
 549                 byte *temptexels2;
 550                 temptexels2 = qmalloc(width2*height2*4); // scaleup buffer
 551                 if (bytesperpixel == 1) // 8bit
 552                         Image_Copy8bitRGBA(data, temptexels2, width*height, d_8to24table);
 553                 else
 554                         Image_CopyRGBAGamma(data, temptexels2, width*height);
 555                 while (width2 > width3 || height2 > height3)
 556                 {
 557                         w = width2;h = height2;
 558                         if (width2 > width3) width2 >>= 1;
 559                         if (height2 > height3) height2 >>= 1;
 560                         if (width2 <= width3 && height2 <= height3) // size achieved
 561                                 GL_MipReduce(temptexels2, glt->texels[0], w, h, width3, height3);
 562                         else
 563                                 GL_MipReduce(temptexels2, temptexels2, w, h, width3, height3);
 564                 }
 565                 qfree(temptexels2);
 566         }
 567         else // scaling...
 568         {
 569                 byte *temptexels;
 570                 // pre-scaleup buffer
 571                 temptexels = qmalloc(width*height*4);
 572                 if (bytesperpixel == 1) // 8bit
 573                         Image_Copy8bitRGBA(data, temptexels, width*height, d_8to24table);
 574                 else
 575                         Image_CopyRGBAGamma(data, temptexels, width*height);
 576                 if (width2 != width3 || height2 != height3) // reduced by gl_pic_mip or gl_max_size
 577                 {
 578                         byte *temptexels2;
 579                         temptexels2 = qmalloc(width2*height2*4); // scaleup buffer
 580                         GL_ResampleTexture(temptexels, width, height, temptexels2, width2, height2);
 581                         while (width2 > width3 || height2 > height3)
 582                         {
 583                                 w = width2;h = height2;
 584                                 if (width2 > width3) width2 >>= 1;
 585                                 if (height2 > height3) height2 >>= 1;
 586                                 if (width2 <= width3 && height2 <= height3) // size achieved
 587                                         GL_MipReduce(temptexels2, glt->texels[0], w, h, width3, height3);
 588                                 else
 589                                         GL_MipReduce(temptexels2, temptexels2, w, h, width3, height3);
 590                         }
 591                         qfree(temptexels2);
 592                 }
 593                 else // copy directly
 594                         GL_ResampleTexture(temptexels, width, height, glt->texels[0], width2, height2);
 595                 qfree(temptexels);
 596         }
 597         if (alpha)
 598         {
 599                 byte    *in = glt->texels[0] + 3;
 600                 for (i = 0;i < width*height;i++, in += 4)
 601                         if (*in < 255)
 602                         {
 603                                 glt->alpha = true;
 604                                 break;
 605                         }
 606         }
 607         // this loop is skipped if there are no mipmaps to generate
 608         for (mip = 1;mip < MAXMIPS && glt->texels[mip];mip++)
 609                 GL_MipReduce(glt->texels[mip-1], glt->texels[mip], glt->texelsize[mip-1][0], glt->texelsize[mip-1][1], 1, 1);
 610         GL_UploadTexture(glt);
 611         GL_FreeTexels(glt);
 612
 613 //      if (bytesperpixel == 1) // 8bit
 614 //              GL_Upload8 (data, width, height, mipmap, alpha);
 615 //      else // 32bit
 616 //              GL_Upload32 (data, width, height, mipmap, true);
 617
 618         return glt->texnum;
 619 }
 620
 621 int GL_GetTextureSlots (int count)
 622 {
 623         gltexture_t             *glt, *first;
 624
 625         first = glt = &gltextures[numgltextures];
 626         while (count--)
 627         {
 628                 glt->identifier[0] = 0;
 629                 glt->texnum = texture_extension_number++;
 630                 glt->crc = 0;
 631                 glt->width = 0;
 632                 glt->height = 0;
 633                 glt->bytesperpixel = 0;
 634                 glt++;
 635                 numgltextures++;
 636         }
 637         return first->texnum;
 638 }