gl_textures.c

   1 #include "quakedef.h"
   2
   3 cvar_t          r_max_size = {"r_max_size", "2048"};
   4 cvar_t          r_picmip = {"r_picmip", "0"};
   5 cvar_t          r_lerpimages = {"r_lerpimages", "1"};
   6 cvar_t          r_upload = {"r_upload", "1"};
   7 cvar_t          r_precachetextures = {"r_precachetextures", "1", true};
   8
   9 int             gl_filter_min = GL_LINEAR_MIPMAP_LINEAR; //NEAREST;
  10 int             gl_filter_max = GL_LINEAR;
  11
  12
  13 int             texels;
  14
  15 // 65536x65536
  16 #define MAXMIPS 16
  17
  18 #define GLTEXF_LERPED 1
  19 #define GLTEXF_UPLOADED 2
  20
  21 typedef struct
  22 {
  23         char    identifier[64];
  24         int             texnum; // GL texture slot number
  25         int             texeldatasize; // computed memory usage of this texture (including mipmaps, expansion to 32bit, etc)
  26         byte    *inputtexels; // copy of the original texture supplied to the upload function, for re-uploading or deferred uploads (non-precached)
  27         int             inputtexeldatasize; // size of the original texture
  28         unsigned short width, height;
  29 // LordHavoc: CRC to identify cache mismatchs
  30         unsigned short crc;
  31         int flags; // the requested flags when the texture was supplied to the upload function
  32         int internalflags; // internal notes (lerped, etc)
  33 } gltexture_t;
  34
  35 #define MAX_GLTEXTURES  4096
  36 gltexture_t     *gltextures;
  37 unsigned int numgltextures = 0, gl_texture_number = 1;
  38
  39 void GL_UploadTexture(gltexture_t *t);
  40
  41 int R_GetTexture(rtexture_t *rt)
  42 {
  43         gltexture_t *glt;
  44         if (!rt)
  45                 return 0;
  46         glt = (gltexture_t *)rt;
  47         if (!(glt->internalflags & GLTEXF_UPLOADED))
  48         {
  49                 GL_UploadTexture(glt);
  50                 if (!(glt->internalflags & GLTEXF_UPLOADED))
  51                         Host_Error("R_GetTexture: unable to upload texture\n");
  52         }
  53         return glt->texnum;
  54 }
  55
  56 typedef struct
  57 {
  58         char *name;
  59         int     minimize, maximize;
  60 } glmode_t;
  61
  62 glmode_t modes[] =
  63 {
  64         {"GL_NEAREST", GL_NEAREST, GL_NEAREST},
  65         {"GL_LINEAR", GL_LINEAR, GL_LINEAR},
  66         {"GL_NEAREST_MIPMAP_NEAREST", GL_NEAREST_MIPMAP_NEAREST, GL_NEAREST},
  67         {"GL_LINEAR_MIPMAP_NEAREST", GL_LINEAR_MIPMAP_NEAREST, GL_LINEAR},
  68         {"GL_NEAREST_MIPMAP_LINEAR", GL_NEAREST_MIPMAP_LINEAR, GL_NEAREST},
  69         {"GL_LINEAR_MIPMAP_LINEAR", GL_LINEAR_MIPMAP_LINEAR, GL_LINEAR}
  70 };
  71
  72 /*
  73 ===============
  74 Draw_TextureMode_f
  75 ===============
  76 */
  77 void Draw_TextureMode_f (void)
  78 {
  79         int             i;
  80         gltexture_t     *glt;
  81
  82         if (Cmd_Argc() == 1)
  83         {
  84                 for (i=0 ; i< 6 ; i++)
  85                         if (gl_filter_min == modes[i].minimize)
  86                         {
  87                                 Con_Printf ("%s\n", modes[i].name);
  88                                 return;
  89                         }
  90                 Con_Printf ("current filter is unknown???\n");
  91                 return;
  92         }
  93
  94         for (i=0 ; i< 6 ; i++)
  95         {
  96                 if (!Q_strcasecmp (modes[i].name, Cmd_Argv(1) ) )
  97                         break;
  98         }
  99         if (i == 6)
 100         {
 101                 Con_Printf ("bad filter name\n");
 102                 return;
 103         }
 104
 105         gl_filter_min = modes[i].minimize;
 106         gl_filter_max = modes[i].maximize;
 107
 108         if (!r_upload.value)
 109                 return;
 110         // change all the existing mipmap texture objects
 111         for (i=0, glt=gltextures ; i<numgltextures ; i++, glt++)
 112         {
 113                 if (glt->flags & TEXF_MIPMAP)
 114                 {
 115                         glBindTexture(GL_TEXTURE_2D, glt->texnum);
 116                         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, gl_filter_min);
 117                         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, gl_filter_max);
 118                 }
 119         }
 120 }
 121
 122 void GL_TextureStats_Print(char *name, int total, int total2, int loaded, int crc, int mip, int alpha, int total2valid)
 123 {
 124         if (!name[0])
 125                 name = "<unnamed>";
 126         Con_Printf("%5iK %c%5iK%c %04X %s %s %s %s\n", total, total2valid ? ' ' : '(', total2, total2valid ? ' ' : ')', crc, loaded ? "loaded" : "      ", mip ? "mip" : "   ", alpha ? "alpha" : "     ", name);
 127 }
 128
 129 void GL_TextureStats_PrintTotal(void)
 130 {
 131         int i, t = 0, p = 0, loaded = 0, loadedt = 0, loadedp = 0;
 132         gltexture_t *glt;
 133         for (i = 0, glt = gltextures;i < numgltextures;i++, glt++)
 134         {
 135                 t += glt->texeldatasize;
 136                 p += glt->inputtexeldatasize;
 137                 if (glt->internalflags & GLTEXF_UPLOADED)
 138                 {
 139                         loaded++;
 140                         loadedt += glt->texeldatasize;
 141                         loadedp += glt->inputtexeldatasize;
 142                 }
 143         }
 144         Con_Printf("total: %i (%.3fMB, %.3fMB original), uploaded %i (%.3fMB, %.3fMB original), upload on demand %i (%.3fMB, %.3fMB original)\n", numgltextures, t / 1048576.0, p / 1048576.0, loaded, loadedt / 1048576.0, loadedp / 1048576.0, numgltextures - loaded, (t - loadedt) / 1048576.0, (p - loadedp) / 1048576.0);
 145 }
 146
 147 void GL_TextureStats_f(void)
 148 {
 149         int i;
 150         gltexture_t *glt;
 151         Con_Printf("kbytes original crc  loaded mip alpha name\n");
 152         for (i = 0, glt = gltextures;i < numgltextures;i++, glt++)
 153                 GL_TextureStats_Print(glt->identifier, (glt->texeldatasize + 1023) / 1024, (glt->inputtexeldatasize + 1023) / 1024, glt->internalflags & GLTEXF_UPLOADED, glt->crc, glt->flags & TEXF_MIPMAP, glt->flags & TEXF_ALPHA, glt->inputtexels != NULL);
 154         GL_TextureStats_PrintTotal();
 155 }
 156
 157 char engineversion[40];
 158
 159 //void GL_UploadTexture (gltexture_t *glt);
 160 void r_textures_start()
 161 {
 162 //      int i;
 163 //      gltexture_t *glt;
 164 //      for (i=0, glt=gltextures ; i<numgltextures ; i++, glt++)
 165 //              GL_UploadTexture(glt);
 166 }
 167
 168 void r_textures_shutdown()
 169 {
 170 }
 171
 172 void r_textures_newmap()
 173 {
 174 }
 175
 176 void R_Textures_Init (void)
 177 {
 178         Cmd_AddCommand("r_texturestats", GL_TextureStats_f);
 179         Cvar_RegisterVariable (&r_max_size);
 180         Cvar_RegisterVariable (&r_picmip);
 181         Cvar_RegisterVariable (&r_lerpimages);
 182         Cvar_RegisterVariable (&r_upload);
 183         Cvar_RegisterVariable (&r_precachetextures);
 184 #ifdef NORENDER
 185         r_upload.value = 0;
 186 #endif
 187
 188         // 3dfx can only handle 256 wide textures
 189         if (!Q_strncasecmp ((char *)gl_renderer, "3dfx",4) || strstr((char *)gl_renderer, "Glide"))
 190                 Cvar_Set ("r_max_size", "256");
 191
 192         gltextures = qmalloc(sizeof(gltexture_t) * MAX_GLTEXTURES);
 193         memset(gltextures, 0, sizeof(gltexture_t) * MAX_GLTEXTURES);
 194         Cmd_AddCommand ("gl_texturemode", &Draw_TextureMode_f);
 195
 196         R_RegisterModule("R_Textures", r_textures_start, r_textures_shutdown, r_textures_newmap);
 197 }
 198
 199 /*
 200 ================
 201 R_FindTexture
 202 ================
 203 */
 204 int R_FindTexture (char *identifier)
 205 {
 206         int             i;
 207         gltexture_t     *glt;
 208
 209         for (i=0, glt=gltextures ; i<numgltextures ; i++, glt++)
 210         {
 211                 if (!strcmp (identifier, glt->identifier))
 212                         return gltextures[i].texnum;
 213         }
 214
 215         return -1;
 216 }
 217
 218 void R_ResampleTextureLerpLine (byte *in, byte *out, int inwidth, int outwidth)
 219 {
 220         int             j, xi, oldx = 0, f, fstep, endx;
 221         fstep = (int) (inwidth*65536.0f/outwidth);
 222         endx = (inwidth-1);
 223         for (j = 0,f = 0;j < outwidth;j++, f += fstep)
 224         {
 225                 xi = (int) f >> 16;
 226                 if (xi != oldx)
 227                 {
 228                         in += (xi - oldx) * 4;
 229                         oldx = xi;
 230                 }
 231                 if (xi < endx)
 232                 {
 233                         int lerp = f & 0xFFFF;
 234                         *out++ = (byte) ((((in[4] - in[0]) * lerp) >> 16) + in[0]);
 235                         *out++ = (byte) ((((in[5] - in[1]) * lerp) >> 16) + in[1]);
 236                         *out++ = (byte) ((((in[6] - in[2]) * lerp) >> 16) + in[2]);
 237                         *out++ = (byte) ((((in[7] - in[3]) * lerp) >> 16) + in[3]);
 238                 }
 239                 else // last pixel of the line has no pixel to lerp to
 240                 {
 241                         *out++ = in[0];
 242                         *out++ = in[1];
 243                         *out++ = in[2];
 244                         *out++ = in[3];
 245                 }
 246         }
 247 }
 248
 249 /*
 250 ================
 251 R_ResampleTexture
 252 ================
 253 */
 254 void R_ResampleTexture (void *indata, int inwidth, int inheight, void *outdata,  int outwidth, int outheight)
 255 {
 256         if (r_lerpimages.value)
 257         {
 258                 int             i, j, yi, oldy, f, fstep, endy = (inheight-1);
 259                 byte    *inrow, *out, *row1, *row2;
 260                 out = outdata;
 261                 fstep = (int) (inheight*65536.0f/outheight);
 262
 263                 row1 = qmalloc(outwidth*4);
 264                 row2 = qmalloc(outwidth*4);
 265                 inrow = indata;
 266                 oldy = 0;
 267                 R_ResampleTextureLerpLine (inrow, row1, inwidth, outwidth);
 268                 R_ResampleTextureLerpLine (inrow + inwidth*4, row2, inwidth, outwidth);
 269                 for (i = 0, f = 0;i < outheight;i++,f += fstep)
 270                 {
 271                         yi = f >> 16;
 272                         if (yi < endy)
 273                         {
 274                                 int lerp = f & 0xFFFF;
 275                                 if (yi != oldy)
 276                                 {
 277                                         inrow = (byte *)indata + inwidth*4*yi;
 278                                         if (yi == oldy+1)
 279                                                 memcpy(row1, row2, outwidth*4);
 280                                         else
 281                                                 R_ResampleTextureLerpLine (inrow, row1, inwidth, outwidth);
 282                                         R_ResampleTextureLerpLine (inrow + inwidth*4, row2, inwidth, outwidth);
 283                                         oldy = yi;
 284                                 }
 285                                 j = outwidth - 4;
 286                                 while(j >= 0)
 287                                 {
 288                                         out[ 0] = (byte) ((((row2[ 0] - row1[ 0]) * lerp) >> 16) + row1[ 0]);
 289                                         out[ 1] = (byte) ((((row2[ 1] - row1[ 1]) * lerp) >> 16) + row1[ 1]);
 290                                         out[ 2] = (byte) ((((row2[ 2] - row1[ 2]) * lerp) >> 16) + row1[ 2]);
 291                                         out[ 3] = (byte) ((((row2[ 3] - row1[ 3]) * lerp) >> 16) + row1[ 3]);
 292                                         out[ 4] = (byte) ((((row2[ 4] - row1[ 4]) * lerp) >> 16) + row1[ 4]);
 293                                         out[ 5] = (byte) ((((row2[ 5] - row1[ 5]) * lerp) >> 16) + row1[ 5]);
 294                                         out[ 6] = (byte) ((((row2[ 6] - row1[ 6]) * lerp) >> 16) + row1[ 6]);
 295                                         out[ 7] = (byte) ((((row2[ 7] - row1[ 7]) * lerp) >> 16) + row1[ 7]);
 296                                         out[ 8] = (byte) ((((row2[ 8] - row1[ 8]) * lerp) >> 16) + row1[ 8]);
 297                                         out[ 9] = (byte) ((((row2[ 9] - row1[ 9]) * lerp) >> 16) + row1[ 9]);
 298                                         out[10] = (byte) ((((row2[10] - row1[10]) * lerp) >> 16) + row1[10]);
 299                                         out[11] = (byte) ((((row2[11] - row1[11]) * lerp) >> 16) + row1[11]);
 300                                         out[12] = (byte) ((((row2[12] - row1[12]) * lerp) >> 16) + row1[12]);
 301                                         out[13] = (byte) ((((row2[13] - row1[13]) * lerp) >> 16) + row1[13]);
 302                                         out[14] = (byte) ((((row2[14] - row1[14]) * lerp) >> 16) + row1[14]);
 303                                         out[15] = (byte) ((((row2[15] - row1[15]) * lerp) >> 16) + row1[15]);
 304                                         out += 16;
 305                                         row1 += 16;
 306                                         row2 += 16;
 307                                         j--;
 308                                 }
 309                                 if (j & 2)
 310                                 {
 311                                         out[ 0] = (byte) ((((row2[ 0] - row1[ 0]) * lerp) >> 16) + row1[ 0]);
 312                                         out[ 1] = (byte) ((((row2[ 1] - row1[ 1]) * lerp) >> 16) + row1[ 1]);
 313                                         out[ 2] = (byte) ((((row2[ 2] - row1[ 2]) * lerp) >> 16) + row1[ 2]);
 314                                         out[ 3] = (byte) ((((row2[ 3] - row1[ 3]) * lerp) >> 16) + row1[ 3]);
 315                                         out[ 4] = (byte) ((((row2[ 4] - row1[ 4]) * lerp) >> 16) + row1[ 4]);
 316                                         out[ 5] = (byte) ((((row2[ 5] - row1[ 5]) * lerp) >> 16) + row1[ 5]);
 317                                         out[ 6] = (byte) ((((row2[ 6] - row1[ 6]) * lerp) >> 16) + row1[ 6]);
 318                                         out[ 7] = (byte) ((((row2[ 7] - row1[ 7]) * lerp) >> 16) + row1[ 7]);
 319                                         out += 8;
 320                                         row1 += 8;
 321                                         row2 += 8;
 322                                 }
 323                                 if (j & 1)
 324                                 {
 325                                         out[ 0] = (byte) ((((row2[ 0] - row1[ 0]) * lerp) >> 16) + row1[ 0]);
 326                                         out[ 1] = (byte) ((((row2[ 1] - row1[ 1]) * lerp) >> 16) + row1[ 1]);
 327                                         out[ 2] = (byte) ((((row2[ 2] - row1[ 2]) * lerp) >> 16) + row1[ 2]);
 328                                         out[ 3] = (byte) ((((row2[ 3] - row1[ 3]) * lerp) >> 16) + row1[ 3]);
 329                                         out += 4;
 330                                         row1 += 4;
 331                                         row2 += 4;
 332                                 }
 333                                 row1 -= outwidth*4;
 334                                 row2 -= outwidth*4;
 335                         }
 336                         else
 337                         {
 338                                 if (yi != oldy)
 339                                 {
 340                                         inrow = (byte *)indata + inwidth*4*yi;
 341                                         if (yi == oldy+1)
 342                                                 memcpy(row1, row2, outwidth*4);
 343                                         else
 344                                                 R_ResampleTextureLerpLine (inrow, row1, inwidth, outwidth);
 345                                         oldy = yi;
 346                                 }
 347                                 memcpy(out, row1, outwidth * 4);
 348                         }
 349                 }
 350                 qfree(row1);
 351                 qfree(row2);
 352         }
 353         else
 354         {
 355                 int i, j;
 356                 unsigned frac, fracstep;
 357                 // relies on int being 4 bytes
 358                 int *inrow, *out;
 359                 out = outdata;
 360
 361                 fracstep = inwidth*0x10000/outwidth;
 362                 for (i = 0;i < outheight;i++)
 363                 {
 364                         inrow = (int *)indata + inwidth*(i*inheight/outheight);
 365                         frac = fracstep >> 1;
 366                         j = outwidth - 4;
 367                         while(j >= 0)
 368                         {
 369                                 out[0] = inrow[frac >> 16];frac += fracstep;
 370                                 out[1] = inrow[frac >> 16];frac += fracstep;
 371                                 out[2] = inrow[frac >> 16];frac += fracstep;
 372                                 out[3] = inrow[frac >> 16];frac += fracstep;
 373                                 out += 4;
 374                         }
 375                         if (j & 2)
 376                         {
 377                                 out[0] = inrow[frac >> 16];frac += fracstep;
 378                                 out[1] = inrow[frac >> 16];frac += fracstep;
 379                                 out += 2;
 380                         }
 381                         if (j & 1)
 382                         {
 383                                 out[0] = inrow[frac >> 16];frac += fracstep;
 384                                 out += 1;
 385                         }
 386                 }
 387         }
 388 }
 389
 390 // in can be the same as out
 391 void GL_MipReduce(byte *in, byte *out, int width, int height, int destwidth, int destheight)
 392 {
 393         int x, y, width2, height2, nextrow;
 394         if (width > destwidth)
 395         {
 396                 if (height > destheight)
 397                 {
 398                         // reduce both
 399                         width2 = width >> 1;
 400                         height2 = height >> 1;
 401                         nextrow = width << 2;
 402                         for (y = 0;y < height2;y++)
 403                         {
 404                                 for (x = 0;x < width2;x++)
 405                                 {
 406                                         out[0] = (byte) ((in[0] + in[4] + in[nextrow  ] + in[nextrow+4]) >> 2);
 407                                         out[1] = (byte) ((in[1] + in[5] + in[nextrow+1] + in[nextrow+5]) >> 2);
 408                                         out[2] = (byte) ((in[2] + in[6] + in[nextrow+2] + in[nextrow+6]) >> 2);
 409                                         out[3] = (byte) ((in[3] + in[7] + in[nextrow+3] + in[nextrow+7]) >> 2);
 410                                         out += 4;
 411                                         in += 8;
 412                                 }
 413                                 in += nextrow; // skip a line
 414                         }
 415                 }
 416                 else
 417                 {
 418                         // reduce width
 419                         width2 = width >> 1;
 420                         for (y = 0;y < height;y++)
 421                         {
 422                                 for (x = 0;x < width2;x++)
 423                                 {
 424                                         out[0] = (byte) ((in[0] + in[4]) >> 1);
 425                                         out[1] = (byte) ((in[1] + in[5]) >> 1);
 426                                         out[2] = (byte) ((in[2] + in[6]) >> 1);
 427                                         out[3] = (byte) ((in[3] + in[7]) >> 1);
 428                                         out += 4;
 429                                         in += 8;
 430                                 }
 431                         }
 432                 }
 433         }
 434         else
 435         {
 436                 if (height > destheight)
 437                 {
 438                         // reduce height
 439                         height2 = height >> 1;
 440                         nextrow = width << 2;
 441                         for (y = 0;y < height2;y++)
 442                         {
 443                                 for (x = 0;x < width;x++)
 444                                 {
 445                                         out[0] = (byte) ((in[0] + in[nextrow  ]) >> 1);
 446                                         out[1] = (byte) ((in[1] + in[nextrow+1]) >> 1);
 447                                         out[2] = (byte) ((in[2] + in[nextrow+2]) >> 1);
 448                                         out[3] = (byte) ((in[3] + in[nextrow+3]) >> 1);
 449                                         out += 4;
 450                                         in += 4;
 451                                 }
 452                                 in += nextrow; // skip a line
 453                         }
 454                 }
 455                 else
 456                         Sys_Error("GL_MipReduce: desired size already achieved\n");
 457         }
 458 }
 459
 460 void GL_Upload32(int glslot, byte *data, int width, int height, int flags)
 461 {
 462         int mip, width2, height2, width3, height3, internalformat;
 463         byte *gammadata, *buffer;
 464
 465         if (!r_upload.value)
 466                 return;
 467
 468         // 3 and 4 are converted by the driver to it's preferred format for the current display mode
 469         internalformat = 3;
 470         if (flags & TEXF_ALPHA)
 471                 internalformat = 4;
 472
 473         // calculate power of 2 size
 474         width2 = 1;while (width2 < width) width2 <<= 1;
 475         height2 = 1;while (height2 < height) height2 <<= 1;
 476         // calculate final size (mipmapped downward to this)
 477         width3 = width2 >> (int) r_picmip.value;
 478         height3 = height2 >> (int) r_picmip.value;
 479         while (width3 > (int) r_max_size.value) width3 >>= 1;
 480         while (height3 > (int) r_max_size.value) height3 >>= 1;
 481         if (width3 < 1) width3 = 1;
 482         if (height3 < 1) height3 = 1;
 483
 484         gammadata = qmalloc(width*height*4);
 485         buffer = qmalloc(width2*height2*4);
 486         if (!gammadata || !buffer)
 487                 Host_Error("GL_Upload32: out of memory\n");
 488
 489         Image_CopyRGBAGamma(data, gammadata, width*height);
 490
 491         R_ResampleTexture(gammadata, width, height, buffer, width2, height2);
 492
 493         qfree(gammadata);
 494
 495         while (width2 > width3 || height2 > height3)
 496         {
 497                 GL_MipReduce(buffer, buffer, width2, height2, width3, height3);
 498
 499                 if (width2 > width3)
 500                         width2 >>= 1;
 501                 if (height2 > height3)
 502                         height2 >>= 1;
 503         }
 504
 505         glBindTexture(GL_TEXTURE_2D, glslot);
 506         mip = 0;
 507         glTexImage2D(GL_TEXTURE_2D, mip++, internalformat, width2, height2, 0, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
 508         if (flags & TEXF_MIPMAP)
 509         {
 510                 while (width2 > 1 || height2 > 1)
 511                 {
 512                         GL_MipReduce(buffer, buffer, width2, height2, 1, 1);
 513
 514                         if (width2 > 1)
 515                                 width2 >>= 1;
 516                         if (height2 > 1)
 517                                 height2 >>= 1;
 518
 519                         glTexImage2D(GL_TEXTURE_2D, mip++, internalformat, width2, height2, 0, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
 520                 }
 521
 522                 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, gl_filter_min);
 523                 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, gl_filter_max);
 524         }
 525         else
 526         {
 527                 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, gl_filter_max);
 528                 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, gl_filter_max);
 529         }
 530         glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 531
 532         qfree(buffer);
 533 }
 534
 535 void GL_Upload8 (int glslot, byte *data, int width, int height, int flags)
 536 {
 537         byte *data32;
 538         data32 = qmalloc(width*height*4);
 539         Image_Copy8bitRGBA(data, data32, width*height, d_8to24table);
 540         GL_Upload32(glslot, data32, width, height, flags);
 541         qfree(data32);
 542 }
 543
 544 void GL_UploadTexture (gltexture_t *glt)
 545 {
 546         if (glt->inputtexels == NULL)
 547                 return;
 548         if (glt->flags & TEXF_RGBA)
 549                 GL_Upload32(glt->texnum, glt->inputtexels, glt->width, glt->height, glt->flags);
 550         else // 8bit
 551                 GL_Upload8(glt->texnum, glt->inputtexels, glt->width, glt->height, glt->flags);
 552         glt->internalflags |= GLTEXF_UPLOADED;
 553         qfree(glt->inputtexels);
 554         glt->inputtexels = NULL;
 555 }
 556
 557 int R_CalcTexelDataSize (int width, int height, int mipmapped)
 558 {
 559         int width2, height2, size;
 560         width2 = 1;while (width2 < width) width2 <<= 1;
 561         height2 = 1;while (height2 < height) height2 <<= 1;
 562         // calculate final size (mipmapped downward to this)
 563         width2 >>= (int) r_picmip.value;
 564         height2 >>= (int) r_picmip.value;
 565         while (width2 > (int) r_max_size.value) width2 >>= 1;
 566         while (height2 > (int) r_max_size.value) height2 >>= 1;
 567         if (width2 < 1) width2 = 1;
 568         if (height2 < 1) height2 = 1;
 569
 570         size = 0;
 571         if (mipmapped)
 572         {
 573                 while (width2 > 1 || height2 > 1)
 574                 {
 575                         size += width2 * height2;
 576                         if (width2 > 1)
 577                                 width2 >>= 1;
 578                         if (height2 > 1)
 579                                 height2 >>= 1;
 580                 }
 581                 size++; // count the last 1x1 mipmap
 582         }
 583         else
 584                 size = width2*height2;
 585
 586         size *= 4; // RGBA
 587
 588         return size;
 589 }
 590
 591 /*
 592 ================
 593 GL_LoadTexture
 594 ================
 595 */
 596 rtexture_t *R_LoadTexture (char *identifier, int width, int height, byte *data, int flags)
 597 {
 598         int                             i, bytesperpixel, internalflags, precache;
 599         gltexture_t             *glt;
 600         unsigned short  crc;
 601
 602         if (isDedicated)
 603                 return NULL;
 604
 605         if (!identifier[0])
 606                 Host_Error("R_LoadTexture: no identifier\n");
 607
 608         // clear the alpha flag if the texture has no transparent pixels
 609         if (flags & TEXF_ALPHA)
 610         {
 611                 int alpha = false;
 612                 if (flags & TEXF_RGBA)
 613                 {
 614                         for (i = 0;i < width * height;i++)
 615                         {
 616                                 if (data[i * 4 + 3] < 255)
 617                                 {
 618                                         alpha = true;
 619                                         break;
 620                                 }
 621                         }
 622                 }
 623                 else
 624                 {
 625                         for (i = 0;i < width * height;i++)
 626                         {
 627                                 if (data[i] == 255)
 628                                 {
 629                                         alpha = true;
 630                                         break;
 631                                 }
 632                         }
 633                 }
 634                 if (!alpha)
 635                         flags &= ~TEXF_ALPHA;
 636         }
 637
 638         if (flags & TEXF_RGBA)
 639                 bytesperpixel = 4;
 640         else
 641                 bytesperpixel = 1;
 642
 643         internalflags = 0;
 644         if (r_lerpimages.value != 0)
 645                 internalflags |= GLTEXF_LERPED;
 646
 647         // LordHavoc: do a CRC to confirm the data really is the same as previous occurances.
 648         crc = CRC_Block(data, width*height*bytesperpixel);
 649         // see if the texture is already present
 650         for (i=0, glt=gltextures ; i<numgltextures ; i++, glt++)
 651         {
 652                 if (!strcmp (identifier, glt->identifier))
 653                 {
 654                         // LordHavoc: everyone hates cache mismatchs, so I fixed it
 655                         if (crc != glt->crc || width != glt->width || height != glt->height || flags != glt->flags)
 656                         {
 657                                 Con_DPrintf("GL_LoadTexture: cache mismatch, replacing old texture\n");
 658                                 goto GL_LoadTexture_setup; // drop out with glt pointing to the texture to replace
 659                         }
 660                         if (internalflags != glt->internalflags)
 661                                 goto GL_LoadTexture_setup; // drop out with glt pointing to the texture to replace
 662                         return (rtexture_t *)glt;
 663                 }
 664         }
 665
 666 /*
 667         if (freeglt)
 668         {
 669                 glt = freeglt;
 670                 strcpy (glt->identifier, identifier);
 671         }
 672         else
 673         {
 674 */
 675                 // LordHavoc: check if there are still slots available
 676                 if (numgltextures >= MAX_GLTEXTURES)
 677                         Sys_Error ("GL_LoadTexture: ran out of texture slots (%d)\n", MAX_GLTEXTURES);
 678                 glt = &gltextures[numgltextures++];
 679                 glt->texnum = gl_texture_number++;
 680                 strcpy (glt->identifier, identifier);
 681 //      }
 682
 683 // LordHavoc: label to drop out of the loop into the setup code
 684 GL_LoadTexture_setup:
 685         glt->crc = crc; // LordHavoc: used to verify textures are identical
 686         glt->width = width;
 687         glt->height = height;
 688         glt->flags = flags;
 689         glt->internalflags = internalflags;
 690
 691         if (glt->inputtexels)
 692                 qfree(glt->inputtexels);
 693         glt->inputtexeldatasize = width*height*bytesperpixel;
 694         glt->inputtexels = qmalloc(glt->inputtexeldatasize);
 695
 696         memcpy(glt->inputtexels, data, glt->inputtexeldatasize);
 697
 698         glt->texeldatasize = R_CalcTexelDataSize(width, height, flags & TEXF_MIPMAP);
 699
 700         precache = false;
 701         if (r_precachetextures.value >= 1)
 702         {
 703                 if (flags & TEXF_PRECACHE)
 704                         precache = true;
 705                 if (r_precachetextures.value >= 2)
 706                         precache = true;
 707         }
 708
 709         if (precache)
 710                 GL_UploadTexture(glt);
 711
 712         return (rtexture_t *)glt;
 713 }
 714
 715 // only used for lightmaps
 716 int R_GetTextureSlots(int count)
 717 {
 718         int i;
 719         i = gl_texture_number;
 720         gl_texture_number += count;
 721         return i;
 722 }