gl_textures.c

   1
   2 #include "quakedef.h"
   3
   4 cvar_t  r_max_size = {CVAR_SAVE, "r_max_size", "2048"};
   5 cvar_t  r_max_scrapsize = {CVAR_SAVE, "r_max_scrapsize", "256"};
   6 cvar_t  r_picmip = {CVAR_SAVE, "r_picmip", "0"};
   7 cvar_t  r_lerpimages = {CVAR_SAVE, "r_lerpimages", "1"};
   8 cvar_t  r_precachetextures = {CVAR_SAVE, "r_precachetextures", "1"};
   9
  10 int             gl_filter_min = GL_LINEAR_MIPMAP_LINEAR;
  11 int             gl_filter_mag = GL_LINEAR;
  12
  13
  14 static mempool_t *texturemempool;
  15 static mempool_t *texturedatamempool;
  16 static mempool_t *textureprocessingmempool;
  17
  18 // note: this must not conflict with TEXF_ flags in r_textures.h
  19 // cleared when a texture is uploaded
  20 #define GLTEXF_UPLOAD 0x00010000
  21 // bitmask for mismatch checking
  22 #define GLTEXF_IMPORTANTBITS (0)
  23 // set when image is uploaded and freed
  24 #define GLTEXF_DESTROYED 0x00040000
  25
  26 // size of images which hold fragment textures, ignores picmip and max_size
  27 static int block_size;
  28
  29 // really this number only governs gltexnuminuse
  30 #define MAX_GLTEXTURES 65536
  31
  32 // since there is only one set of GL texture numbers, we have to track them
  33 // globally, everything else is per texture pool
  34 static qbyte *gltexnuminuse;
  35
  36 typedef struct
  37 {
  38         int textype;
  39         int inputbytesperpixel;
  40         int internalbytesperpixel;
  41         int glformat;
  42         int glinternalformat;
  43         int align;
  44 }
  45 textypeinfo_t;
  46
  47 static textypeinfo_t textype_qpalette       = {TEXTYPE_QPALETTE, 1, 4, GL_RGBA, 3, 1};
  48 static textypeinfo_t textype_rgb            = {TEXTYPE_RGB     , 3, 3, GL_RGB , 3, 3};
  49 static textypeinfo_t textype_rgba           = {TEXTYPE_RGBA    , 4, 4, GL_RGBA, 3, 1};
  50 static textypeinfo_t textype_qpalette_alpha = {TEXTYPE_QPALETTE, 1, 4, GL_RGBA, 4, 1};
  51 static textypeinfo_t textype_rgba_alpha     = {TEXTYPE_RGBA    , 4, 4, GL_RGBA, 4, 1};
  52
  53 // a tiling texture (most common type)
  54 #define GLIMAGETYPE_TILE 0
  55 // a fragments texture (contains one or more fragment textures)
  56 #define GLIMAGETYPE_FRAGMENTS 1
  57
  58 // a gltextureimage can have one (or more if fragments) gltextures inside
  59 typedef struct gltextureimage_s
  60 {
  61         struct gltextureimage_s *imagechain;
  62         int texturecount;
  63         int type; // one of the GLIMAGETYPE_ values
  64         int texnum; // GL texture slot number
  65         int width, height;
  66         int bytesperpixel; // bytes per pixel
  67         int glformat; // GL_RGB or GL_RGBA
  68         int glinternalformat; // 3 or 4
  69         int flags;
  70         short *blockallocation; // fragment allocation
  71 }
  72 gltextureimage_t;
  73
  74 typedef struct gltexture_s
  75 {
  76         // this field is exposed to the R_GetTexture macro, for speed reasons
  77         // (must be identical in rtexture_t)
  78         int texnum; // GL texture slot number
  79
  80         // pointer to texturepool (check this to see if the texture is allocated)
  81         struct gltexturepool_s *pool;
  82         // pointer to next texture in texturepool chain
  83         struct gltexture_s *chain;
  84         // pointer into gltextureimage array
  85         gltextureimage_t *image;
  86         // name of the texture (this might be removed someday), no duplicates
  87         char *identifier;
  88         // location in the image, and size
  89         int x, y, width, height;
  90         // copy of the original texture supplied to the upload function, for re-uploading or deferred uploads (non-precached)
  91         qbyte *inputtexels;
  92         // to identify cache mismatchs (this might be removed someday)
  93         int crc;
  94         // flags supplied to the LoadTexture function
  95         // (might be altered to remove TEXF_ALPHA), and GLTEXF_ private flags
  96         int flags;
  97         // pointer to one of the textype_ structs
  98         textypeinfo_t *textype;
  99 }
 100 gltexture_t;
 101
 102 #define TEXTUREPOOL_SENTINEL 0xC0DEDBAD
 103
 104 typedef struct gltexturepool_s
 105 {
 106         int sentinel;
 107         struct gltextureimage_s *imagechain;
 108         struct gltexture_s *gltchain;
 109         struct gltexturepool_s *next;
 110 }
 111 gltexturepool_t;
 112
 113 static gltexturepool_t *gltexturepoolchain = NULL;
 114
 115 static qbyte *resizebuffer = NULL, *colorconvertbuffer;
 116 static int resizebuffersize = 0;
 117 static qbyte *texturebuffer;
 118 static int texturebuffersize = 0;
 119
 120 static int realmaxsize = 0;
 121
 122 static textypeinfo_t *R_GetTexTypeInfo(int textype, int flags)
 123 {
 124         if (flags & TEXF_ALPHA)
 125         {
 126                 switch(textype)
 127                 {
 128                 case TEXTYPE_QPALETTE:
 129                         return &textype_qpalette_alpha;
 130                 case TEXTYPE_RGB:
 131                         Host_Error("R_GetTexTypeInfo: RGB format has no alpha, TEXF_ALPHA not allowed\n");
 132                         return NULL;
 133                 case TEXTYPE_RGBA:
 134                         return &textype_rgba_alpha;
 135                 default:
 136                         Host_Error("R_GetTexTypeInfo: unknown texture format\n");
 137                         return NULL;
 138                 }
 139         }
 140         else
 141         {
 142                 switch(textype)
 143                 {
 144                 case TEXTYPE_QPALETTE:
 145                         return &textype_qpalette;
 146                 case TEXTYPE_RGB:
 147                         return &textype_rgb;
 148                 case TEXTYPE_RGBA:
 149                         return &textype_rgba;
 150                 default:
 151                         Host_Error("R_GetTexTypeInfo: unknown texture format\n");
 152                         return NULL;
 153                 }
 154         }
 155 }
 156
 157 static void R_UploadTexture(gltexture_t *t);
 158
 159 static void R_PrecacheTexture(gltexture_t *glt)
 160 {
 161         int precache;
 162         precache = false;
 163         if (glt->flags & TEXF_ALWAYSPRECACHE)
 164                 precache = true;
 165         else if (r_precachetextures.integer >= 2)
 166                 precache = true;
 167         else if (r_precachetextures.integer >= 1)
 168                 if (glt->flags & TEXF_PRECACHE)
 169                         precache = true;
 170
 171         if (precache)
 172                 R_UploadTexture(glt);
 173 }
 174
 175 int R_RealGetTexture(rtexture_t *rt)
 176 {
 177         if (rt)
 178         {
 179                 gltexture_t *glt;
 180                 glt = (gltexture_t *)rt;
 181                 if (glt->flags & GLTEXF_UPLOAD)
 182                         R_UploadTexture(glt);
 183                 glt->texnum = glt->image->texnum;
 184                 return glt->image->texnum;
 185         }
 186         else
 187                 return 0;
 188 }
 189
 190 void R_FreeTexture(rtexture_t *rt)
 191 {
 192         gltexture_t *glt, **gltpointer;
 193         gltextureimage_t *image, **gltimagepointer;
 194         GLuint texnum;
 195
 196         glt = (gltexture_t *)rt;
 197         if (glt == NULL)
 198                 Host_Error("R_FreeTexture: texture == NULL\n");
 199
 200         for (gltpointer = &glt->pool->gltchain;*gltpointer && *gltpointer != glt;gltpointer = &(*gltpointer)->chain);
 201         if (*gltpointer == glt)
 202                 *gltpointer = glt->chain;
 203         else
 204                 Host_Error("R_FreeTexture: texture \"%s\" not linked in pool\n", glt->identifier);
 205
 206         // note: if freeing a fragment texture, this will not make the claimed
 207         // space available for new textures unless all other fragments in the
 208         // image are also freed
 209         image = glt->image;
 210         image->texturecount--;
 211         if (image->texturecount < 1)
 212         {
 213                 for (gltimagepointer = &glt->pool->imagechain;*gltimagepointer && *gltimagepointer != image;gltimagepointer = &(*gltimagepointer)->imagechain);
 214                 if (*gltimagepointer == image)
 215                         *gltimagepointer = image->imagechain;
 216                 else
 217                         Host_Error("R_FreeTexture: image not linked in pool\n");
 218                 if (image->texnum)
 219                 {
 220                         texnum = image->texnum;
 221                         gltexnuminuse[image->texnum] = 0;
 222                         qglDeleteTextures(1, &texnum);
 223                 }
 224                 if (image->blockallocation)
 225                         Mem_Free(image->blockallocation);
 226                 Mem_Free(image);
 227         }
 228
 229         if (glt->identifier)
 230                 Mem_Free(glt->identifier);
 231         if (glt->inputtexels)
 232                 Mem_Free(glt->inputtexels);
 233         Mem_Free(glt);
 234 }
 235
 236 static gltexture_t *R_FindTexture (gltexturepool_t *pool, char *identifier)
 237 {
 238         gltexture_t     *glt;
 239
 240         if (!identifier)
 241                 return NULL;
 242
 243         for (glt = pool->gltchain;glt;glt = glt->chain)
 244                 if (glt->identifier && !strcmp (identifier, glt->identifier))
 245                         return glt;
 246
 247         return NULL;
 248 }
 249
 250 rtexturepool_t *R_AllocTexturePool(void)
 251 {
 252         gltexturepool_t *pool;
 253         if (texturemempool == NULL)
 254                 return NULL;
 255         pool = Mem_Alloc(texturemempool, sizeof(gltexturepool_t));
 256         if (pool == NULL)
 257                 return NULL;
 258         pool->next = gltexturepoolchain;
 259         gltexturepoolchain = pool;
 260         pool->sentinel = TEXTUREPOOL_SENTINEL;
 261         return (rtexturepool_t *)pool;
 262 }
 263
 264 void R_FreeTexturePool(rtexturepool_t **rtexturepool)
 265 {
 266         gltexturepool_t *pool, **poolpointer;
 267         if (rtexturepool == NULL)
 268                 return;
 269         if (*rtexturepool == NULL)
 270                 return;
 271         pool = (gltexturepool_t *)(*rtexturepool);
 272         *rtexturepool = NULL;
 273         if (pool->sentinel != TEXTUREPOOL_SENTINEL)
 274                 Host_Error("R_FreeTexturePool: pool already freed\n");
 275         for (poolpointer = &gltexturepoolchain;*poolpointer && *poolpointer != pool;poolpointer = &(*poolpointer)->next);
 276         if (*poolpointer == pool)
 277                 *poolpointer = pool->next;
 278         else
 279                 Host_Error("R_FreeTexturePool: pool not linked\n");
 280         while (pool->gltchain)
 281                 R_FreeTexture((rtexture_t *)pool->gltchain);
 282         if (pool->imagechain)
 283                 Sys_Error("R_FreeTexturePool: not all images freed\n");
 284         Mem_Free(pool);
 285 }
 286
 287
 288 typedef struct
 289 {
 290         char *name;
 291         int minification, magnification;
 292 }
 293 glmode_t;
 294
 295 static glmode_t modes[] =
 296 {
 297         {"GL_NEAREST", GL_NEAREST, GL_NEAREST},
 298         {"GL_LINEAR", GL_LINEAR, GL_LINEAR},
 299         {"GL_NEAREST_MIPMAP_NEAREST", GL_NEAREST_MIPMAP_NEAREST, GL_NEAREST},
 300         {"GL_LINEAR_MIPMAP_NEAREST", GL_LINEAR_MIPMAP_NEAREST, GL_LINEAR},
 301         {"GL_NEAREST_MIPMAP_LINEAR", GL_NEAREST_MIPMAP_LINEAR, GL_NEAREST},
 302         {"GL_LINEAR_MIPMAP_LINEAR", GL_LINEAR_MIPMAP_LINEAR, GL_LINEAR}
 303 };
 304
 305 extern int gl_backend_rebindtextures;
 306
 307 static void GL_TextureMode_f (void)
 308 {
 309         int i;
 310         gltextureimage_t *image;
 311         gltexturepool_t *pool;
 312
 313         if (Cmd_Argc() == 1)
 314         {
 315                 for (i = 0;i < 6;i++)
 316                 {
 317                         if (gl_filter_min == modes[i].minification)
 318                         {
 319                                 Con_Printf ("%s\n", modes[i].name);
 320                                 return;
 321                         }
 322                 }
 323                 Con_Printf ("current filter is unknown???\n");
 324                 return;
 325         }
 326
 327         for (i = 0;i < 6;i++)
 328                 if (!Q_strcasecmp (modes[i].name, Cmd_Argv(1) ) )
 329                         break;
 330         if (i == 6)
 331         {
 332                 Con_Printf ("bad filter name\n");
 333                 return;
 334         }
 335
 336         gl_filter_min = modes[i].minification;
 337         gl_filter_mag = modes[i].magnification;
 338
 339         // change all the existing mipmap texture objects
 340         // FIXME: force renderer(/client/something?) restart instead?
 341         for (pool = gltexturepoolchain;pool;pool = pool->next)
 342         {
 343                 for (image = pool->imagechain;image;image = image->imagechain)
 344                 {
 345                         // only update already uploaded images
 346                         if (!(image->flags & GLTEXF_UPLOAD))
 347                         {
 348                                 qglBindTexture(GL_TEXTURE_2D, image->texnum);
 349                                 if (image->flags & TEXF_MIPMAP)
 350                                         qglTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, gl_filter_min);
 351                                 else
 352                                         qglTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, gl_filter_mag);
 353                                 qglTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, gl_filter_mag);
 354                         }
 355                 }
 356         }
 357         gl_backend_rebindtextures = true;
 358 }
 359
 360 static int R_CalcTexelDataSize (gltexture_t *glt)
 361 {
 362         int width2, height2, size;
 363         if (glt->flags & TEXF_FRAGMENT)
 364                 size = glt->width * glt->height;
 365         else
 366         {
 367                 if (r_max_size.integer > realmaxsize)
 368                         Cvar_SetValue("r_max_size", realmaxsize);
 369                 // calculate final size
 370                 for (width2 = 1;width2 < glt->width;width2 <<= 1);
 371                 for (height2 = 1;height2 < glt->height;height2 <<= 1);
 372                 for (width2 >>= r_picmip.integer;width2 > r_max_size.integer;width2 >>= 1);
 373                 for (height2 >>= r_picmip.integer;height2 > r_max_size.integer;height2 >>= 1);
 374                 if (width2 < 1) width2 = 1;
 375                 if (height2 < 1) height2 = 1;
 376
 377                 size = 0;
 378                 if (glt->flags & TEXF_MIPMAP)
 379                 {
 380                         while (width2 > 1 || height2 > 1)
 381                         {
 382                                 size += width2 * height2;
 383                                 if (width2 > 1)
 384                                         width2 >>= 1;
 385                                 if (height2 > 1)
 386                                         height2 >>= 1;
 387                         }
 388                         size++; // count the last 1x1 mipmap
 389                 }
 390                 else
 391                         size = width2*height2;
 392         }
 393         size *= glt->textype->internalbytesperpixel;
 394
 395         return size;
 396 }
 397
 398 void R_TextureStats_PrintTotal(void)
 399 {
 400         int glsize, inputsize, total = 0, totalt = 0, totalp = 0, loaded = 0, loadedt = 0, loadedp = 0;
 401         gltexture_t *glt;
 402         gltexturepool_t *pool;
 403         for (pool = gltexturepoolchain;pool;pool = pool->next)
 404         {
 405                 for (glt = pool->gltchain;glt;glt = glt->chain)
 406                 {
 407                         glsize = R_CalcTexelDataSize(glt);
 408                         inputsize = glt->width * glt->height * glt->textype->inputbytesperpixel;
 409
 410                         total++;
 411                         totalt += glsize;
 412                         totalp += inputsize;
 413                         if (!(glt->flags & GLTEXF_UPLOAD))
 414                         {
 415                                 loaded++;
 416                                 loadedt += glsize;
 417                                 loadedp += inputsize;
 418                         }
 419                 }
 420         }
 421         Con_Printf("total: %i (%.3fMB, %.3fMB original), uploaded %i (%.3fMB, %.3fMB original), upload on demand %i (%.3fMB, %.3fMB original)\n", total, totalt / 1048576.0, totalp / 1048576.0, loaded, loadedt / 1048576.0, loadedp / 1048576.0, total - loaded, (totalt - loadedt) / 1048576.0, (totalp - loadedp) / 1048576.0);
 422 }
 423
 424 static void R_TextureStats_f(void)
 425 {
 426         int loaded;
 427         gltexture_t *glt;
 428         gltexturepool_t *pool;
 429         Con_Printf("glsize input crc  loaded mip alpha name\n");
 430         for (pool = gltexturepoolchain;pool;pool = pool->next)
 431         {
 432                 for (glt = pool->gltchain;glt;glt = glt->chain)
 433                 {
 434                         loaded = !(glt->flags & GLTEXF_UPLOAD);
 435                         Con_Printf("%c%4i%c%c%4i%c %04X %s %s %s %s\n", loaded ? '[' : ' ', (R_CalcTexelDataSize(glt) + 1023) / 1024, loaded ? ']' : ' ', glt->inputtexels ? '[' : ' ', (glt->width * glt->height * glt->textype->inputbytesperpixel + 1023) / 1024, glt->inputtexels ? ']' : ' ', glt->crc, loaded ? "loaded" : "      ", (glt->flags & TEXF_MIPMAP) ? "mip" : "   ", (glt->flags & TEXF_ALPHA) ? "alpha" : "     ", glt->identifier ? glt->identifier : "<unnamed>");
 436                 }
 437                 Con_Printf("pool %10p\n", pool);
 438         }
 439         R_TextureStats_PrintTotal();
 440 }
 441
 442 char engineversion[40];
 443
 444 static void r_textures_start(void)
 445 {
 446         // deal with size limits of various drivers (3dfx in particular)
 447         qglGetIntegerv(GL_MAX_TEXTURE_SIZE, &realmaxsize);
 448         CHECKGLERROR
 449
 450         // use the largest scrap texture size we can (not sure if this is really a good idea)
 451         for (block_size = 1;block_size < realmaxsize && block_size < r_max_scrapsize.integer;block_size <<= 1);
 452
 453         texturemempool = Mem_AllocPool("Texture Info");
 454         texturedatamempool = Mem_AllocPool("Texture Storage (not yet uploaded)");
 455         textureprocessingmempool = Mem_AllocPool("Texture Processing Buffers");
 456         gltexnuminuse = Mem_Alloc(texturemempool, MAX_GLTEXTURES);
 457 }
 458
 459 static void r_textures_shutdown(void)
 460 {
 461         rtexturepool_t *temp;
 462         while(gltexturepoolchain)
 463         {
 464                 temp = (rtexturepool_t *) gltexturepoolchain;
 465                 R_FreeTexturePool(&temp);
 466         }
 467
 468         resizebuffersize = 0;
 469         texturebuffersize = 0;
 470         resizebuffer = NULL;
 471         colorconvertbuffer = NULL;
 472         texturebuffer = NULL;
 473         gltexnuminuse = NULL;
 474         Mem_FreePool(&texturemempool);
 475         Mem_FreePool(&texturedatamempool);
 476         Mem_FreePool(&textureprocessingmempool);
 477 }
 478
 479 static void r_textures_newmap(void)
 480 {
 481 }
 482
 483 void R_Textures_Init (void)
 484 {
 485         Cmd_AddCommand ("gl_texturemode", &GL_TextureMode_f);
 486         Cmd_AddCommand("r_texturestats", R_TextureStats_f);
 487         Cvar_RegisterVariable (&r_max_scrapsize);
 488         Cvar_RegisterVariable (&r_max_size);
 489         Cvar_RegisterVariable (&r_picmip);
 490         Cvar_RegisterVariable (&r_lerpimages);
 491         Cvar_RegisterVariable (&r_precachetextures);
 492         gltexnuminuse = NULL;
 493
 494         R_RegisterModule("R_Textures", r_textures_start, r_textures_shutdown, r_textures_newmap);
 495 }
 496
 497 void R_Textures_Frame (void)
 498 {
 499         // could do procedural texture animation here, if we keep track of which
 500         // textures were accessed this frame...
 501
 502         // free the resize buffers
 503         resizebuffersize = 0;
 504         if (resizebuffer)
 505         {
 506                 Mem_Free(resizebuffer);
 507                 resizebuffer = NULL;
 508         }
 509         if (colorconvertbuffer)
 510         {
 511                 Mem_Free(colorconvertbuffer);
 512                 colorconvertbuffer = NULL;
 513         }
 514 }
 515
 516 void R_MakeResizeBufferBigger(int size)
 517 {
 518         if (resizebuffersize < size)
 519         {
 520                 resizebuffersize = size;
 521                 if (resizebuffer)
 522                         Mem_Free(resizebuffer);
 523                 if (colorconvertbuffer)
 524                         Mem_Free(colorconvertbuffer);
 525                 resizebuffer = Mem_Alloc(textureprocessingmempool, resizebuffersize);
 526                 colorconvertbuffer = Mem_Alloc(textureprocessingmempool, resizebuffersize);
 527                 if (!resizebuffer || !colorconvertbuffer)
 528                         Host_Error("R_Upload: out of memory\n");
 529         }
 530 }
 531
 532 static void R_Upload(gltexture_t *glt, qbyte *data)
 533 {
 534         int mip, width, height, internalformat;
 535         qbyte *prevbuffer;
 536         prevbuffer = data;
 537
 538         qglBindTexture(GL_TEXTURE_2D, glt->image->texnum);
 539         CHECKGLERROR
 540
 541         gl_backend_rebindtextures = true;
 542
 543         glt->flags &= ~GLTEXF_UPLOAD;
 544
 545         if (glt->flags & TEXF_FRAGMENT)
 546         {
 547                 if (glt->image->flags & GLTEXF_UPLOAD)
 548                 {
 549                         Con_DPrintf("uploaded new fragments image\n");
 550                         R_MakeResizeBufferBigger(glt->image->width * glt->image->height * glt->image->bytesperpixel);
 551                         glt->image->flags &= ~GLTEXF_UPLOAD;
 552                         memset(resizebuffer, 255, glt->image->width * glt->image->height * glt->image->bytesperpixel);
 553                         qglTexImage2D (GL_TEXTURE_2D, 0, glt->image->glinternalformat, glt->image->width, glt->image->height, 0, glt->image->glformat, GL_UNSIGNED_BYTE, resizebuffer);
 554                         CHECKGLERROR
 555                         qglTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, gl_filter_mag);
 556                         CHECKGLERROR
 557                         qglTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, gl_filter_mag);
 558                         CHECKGLERROR
 559                 }
 560
 561                 if (prevbuffer == NULL)
 562                 {
 563                         R_MakeResizeBufferBigger(glt->image->width * glt->image->height * glt->image->bytesperpixel);
 564                         memset(resizebuffer, 255, glt->width * glt->height * glt->image->bytesperpixel);
 565                         prevbuffer = resizebuffer;
 566                 }
 567                 else if (glt->textype->textype == TEXTYPE_QPALETTE)
 568                 {
 569                         // promote paletted to RGBA, so we only have to worry about RGB and
 570                         // RGBA in the rest of this code
 571                         R_MakeResizeBufferBigger(glt->image->width * glt->image->height * glt->image->bytesperpixel);
 572                         Image_Copy8bitRGBA(prevbuffer, colorconvertbuffer, glt->width * glt->height, d_8to24table);
 573                         prevbuffer = colorconvertbuffer;
 574                 }
 575
 576                 qglTexSubImage2D(GL_TEXTURE_2D, 0, glt->x, glt->y, glt->width, glt->height, glt->image->glformat, GL_UNSIGNED_BYTE, prevbuffer);
 577                 CHECKGLERROR
 578                 glt->texnum = glt->image->texnum;
 579                 return;
 580         }
 581
 582         glt->image->flags &= ~GLTEXF_UPLOAD;
 583
 584         // these are rounded up versions of the size to do better resampling
 585         for (width = 1;width < glt->width;width <<= 1);
 586         for (height = 1;height < glt->height;height <<= 1);
 587
 588         R_MakeResizeBufferBigger(width * height * glt->image->bytesperpixel);
 589
 590         if (prevbuffer == NULL)
 591         {
 592                 width = glt->image->width;
 593                 height = glt->image->height;
 594                 memset(resizebuffer, 255, width * height * glt->image->bytesperpixel);
 595                 prevbuffer = resizebuffer;
 596         }
 597         else
 598         {
 599                 if (glt->textype->textype == TEXTYPE_QPALETTE)
 600                 {
 601                         // promote paletted to RGBA, so we only have to worry about RGB and
 602                         // RGBA in the rest of this code
 603                         Image_Copy8bitRGBA(prevbuffer, colorconvertbuffer, glt->width * glt->height, d_8to24table);
 604                         prevbuffer = colorconvertbuffer;
 605                 }
 606
 607                 if (glt->width != width || glt->height != height)
 608                 {
 609                         Image_Resample(prevbuffer, glt->width, glt->height, resizebuffer, width, height, glt->image->bytesperpixel, r_lerpimages.integer);
 610                         prevbuffer = resizebuffer;
 611                 }
 612
 613                 // apply picmip/max_size limitations
 614                 while (width > glt->image->width || height > glt->image->height)
 615                 {
 616                         Image_MipReduce(prevbuffer, resizebuffer, &width, &height, glt->image->width, glt->image->height, glt->image->bytesperpixel);
 617                         prevbuffer = resizebuffer;
 618                 }
 619         }
 620
 621         // 3 and 4 are converted by the driver to it's preferred format for the current display mode
 622         internalformat = 3;
 623         if (glt->flags & TEXF_ALPHA)
 624                 internalformat = 4;
 625
 626         mip = 0;
 627         qglTexImage2D(GL_TEXTURE_2D, mip++, internalformat, width, height, 0, glt->image->glformat, GL_UNSIGNED_BYTE, prevbuffer);
 628         CHECKGLERROR
 629         if (glt->flags & TEXF_MIPMAP)
 630         {
 631                 while (width > 1 || height > 1)
 632                 {
 633                         Image_MipReduce(prevbuffer, resizebuffer, &width, &height, 1, 1, glt->image->bytesperpixel);
 634                         prevbuffer = resizebuffer;
 635
 636                         qglTexImage2D(GL_TEXTURE_2D, mip++, internalformat, width, height, 0, glt->image->glformat, GL_UNSIGNED_BYTE, prevbuffer);
 637                         CHECKGLERROR
 638                 }
 639
 640                 qglTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, gl_filter_min);
 641                 CHECKGLERROR
 642                 qglTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, gl_filter_mag);
 643                 CHECKGLERROR
 644         }
 645         else
 646         {
 647                 qglTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, gl_filter_mag);
 648                 CHECKGLERROR
 649                 qglTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, gl_filter_mag);
 650                 CHECKGLERROR
 651         }
 652         glt->texnum = glt->image->texnum;
 653 }
 654
 655 static void R_FindImageForTexture(gltexture_t *glt)
 656 {
 657         int i, j, best, best2, x, y, w, h;
 658         textypeinfo_t *texinfo;
 659         gltexturepool_t *pool;
 660         gltextureimage_t *image, **imagechainpointer;
 661         texinfo = glt->textype;
 662         pool = glt->pool;
 663
 664         // remains -1 until uploaded
 665         glt->texnum = -1;
 666
 667         x = 0;
 668         y = 0;
 669         w = glt->width;
 670         h = glt->height;
 671         if (glt->flags & TEXF_FRAGMENT)
 672         {
 673                 for (imagechainpointer = &pool->imagechain;*imagechainpointer;imagechainpointer = &(*imagechainpointer)->imagechain)
 674                 {
 675                         image = *imagechainpointer;
 676                         if (image->type != GLIMAGETYPE_FRAGMENTS)
 677                                 continue;
 678                         if (image->glformat != texinfo->glformat || image->glinternalformat != texinfo->glinternalformat)
 679                                 continue;
 680                         if (glt->width > image->width || glt->height > image->height)
 681                                 continue;
 682
 683                         // got a fragments texture, find a place in it if we can
 684                         for (best = image->width, i = 0;i < image->width - w;i += texinfo->align)
 685                         {
 686                                 for (best2 = 0, j = 0;j < w;j++)
 687                                 {
 688                                         if (image->blockallocation[i+j] >= best)
 689                                                 break;
 690                                         if (best2 < image->blockallocation[i+j])
 691                                                 best2 = image->blockallocation[i+j];
 692                                 }
 693                                 if (j == w)
 694                                 {
 695                                         // this is a valid spot
 696                                         x = i;
 697                                         y = best = best2;
 698                                 }
 699                         }
 700
 701                         if (best + h > image->height)
 702                                 continue;
 703
 704                         for (i = 0;i < w;i++)
 705                                 image->blockallocation[x + i] = best + h;
 706
 707                         glt->x = x;
 708                         glt->y = y;
 709                         glt->image = image;
 710                         image->texturecount++;
 711                         return;
 712                 }
 713
 714                 image = Mem_Alloc(texturemempool, sizeof(gltextureimage_t));
 715                 if (image == NULL)
 716                         Sys_Error("R_FindImageForTexture: ran out of memory\n");
 717                 image->type = GLIMAGETYPE_FRAGMENTS;
 718                 // make sure the created image is big enough for the fragment
 719                 for (image->width = block_size;image->width < glt->width;image->width <<= 1);
 720                 for (image->height = block_size;image->height < glt->height;image->height <<= 1);
 721                 image->blockallocation = Mem_Alloc(texturemempool, image->width * sizeof(short));
 722                 memset(image->blockallocation, 0, image->width * sizeof(short));
 723
 724                 x = 0;
 725                 y = 0;
 726                 for (i = 0;i < w;i++)
 727                         image->blockallocation[x + i] = y + h;
 728         }
 729         else
 730         {
 731                 for (imagechainpointer = &pool->imagechain;*imagechainpointer;imagechainpointer = &(*imagechainpointer)->imagechain);
 732
 733                 image = Mem_Alloc(texturemempool, sizeof(gltextureimage_t));
 734                 if (image == NULL)
 735                         Sys_Error("R_FindImageForTexture: ran out of memory\n");
 736                 image->type = GLIMAGETYPE_TILE;
 737                 image->blockallocation = NULL;
 738
 739                 // calculate final size
 740                 if (r_max_size.integer > realmaxsize)
 741                         Cvar_SetValue("r_max_size", realmaxsize);
 742                 for (image->width = 1;image->width < glt->width;image->width <<= 1);
 743                 for (image->height = 1;image->height < glt->height;image->height <<= 1);
 744                 for (image->width >>= r_picmip.integer;image->width > r_max_size.integer;image->width >>= 1);
 745                 for (image->height >>= r_picmip.integer;image->height > r_max_size.integer;image->height >>= 1);
 746                 if (image->width < 1) image->width = 1;
 747                 if (image->height < 1) image->height = 1;
 748         }
 749         image->glinternalformat = texinfo->glinternalformat;
 750         image->glformat = texinfo->glformat;
 751         image->flags = (glt->flags & (TEXF_MIPMAP | TEXF_ALPHA)) | GLTEXF_UPLOAD;
 752         image->bytesperpixel = texinfo->internalbytesperpixel;
 753         for (i = 1;i < MAX_GLTEXTURES;i++)
 754                 if (!gltexnuminuse[i])
 755                         break;
 756         if (i < MAX_GLTEXTURES)
 757                 gltexnuminuse[image->texnum = i] = true;
 758         else
 759                 Sys_Error("R_FindImageForTexture: ran out of GL textures\n");
 760         *imagechainpointer = image;
 761         image->texturecount++;
 762
 763         glt->x = x;
 764         glt->y = y;
 765         glt->image = image;
 766 }
 767
 768 // note: R_FindImageForTexture must be called before this
 769 static void R_UploadTexture (gltexture_t *glt)
 770 {
 771         if (!(glt->flags & GLTEXF_UPLOAD))
 772                 return;
 773
 774         R_Upload(glt, glt->inputtexels);
 775         if (glt->inputtexels)
 776         {
 777                 Mem_Free(glt->inputtexels);
 778                 glt->inputtexels = NULL;
 779                 glt->flags |= GLTEXF_DESTROYED;
 780         }
 781         else if (glt->flags & GLTEXF_DESTROYED)
 782                 Con_Printf("R_UploadTexture: Texture %s already uploaded and destroyed.  Can not upload original image again.  Uploaded blank texture.\n", glt->identifier);
 783 }
 784
 785 static gltexture_t *R_SetupTexture(gltexturepool_t *pool, char *identifier, int crc, int width, int height, int flags, textypeinfo_t *texinfo, qbyte *data)
 786 {
 787         gltexture_t *glt;
 788         glt = Mem_Alloc(texturemempool, sizeof(gltexture_t));
 789         if (identifier)
 790         {
 791                 glt->identifier = Mem_Alloc(texturemempool, strlen(identifier)+1);
 792                 strcpy (glt->identifier, identifier);
 793         }
 794         else
 795                 glt->identifier = NULL;
 796         glt->pool = pool;
 797         glt->chain = pool->gltchain;
 798         pool->gltchain = glt;
 799         glt->crc = crc;
 800         glt->width = width;
 801         glt->height = height;
 802         glt->flags = flags;
 803         glt->textype = texinfo;
 804
 805         if (data)
 806         {
 807                 glt->inputtexels = Mem_Alloc(texturedatamempool, glt->width * glt->height * texinfo->inputbytesperpixel);
 808                 if (glt->inputtexels == NULL)
 809                         Sys_Error("R_SetupTexture: out of memory\n");
 810                 memcpy(glt->inputtexels, data, glt->width * glt->height * texinfo->inputbytesperpixel);
 811         }
 812         else
 813                 glt->inputtexels = NULL;
 814
 815         R_FindImageForTexture(glt);
 816         R_PrecacheTexture(glt);
 817
 818         return glt;
 819 }
 820
 821 /*
 822 ================
 823 R_LoadTexture
 824 ================
 825 */
 826 rtexture_t *R_LoadTexture (rtexturepool_t *rtexturepool, char *identifier, int width, int height, qbyte *data, int textype, int flags)
 827 {
 828         int i;
 829         gltexture_t *glt;
 830         gltexturepool_t *pool = (gltexturepool_t *)rtexturepool;
 831         textypeinfo_t *texinfo;
 832         unsigned short crc;
 833
 834         if (cls.state == ca_dedicated)
 835                 return NULL;
 836
 837         texinfo = R_GetTexTypeInfo(textype, flags);
 838
 839         if (flags & TEXF_FRAGMENT)
 840                 if ((width * texinfo->internalbytesperpixel) & 3)
 841                         Host_Error("R_LoadTexture: incompatible width for fragment");
 842
 843         // clear the alpha flag if the texture has no transparent pixels
 844         switch(textype)
 845         {
 846         case TEXTYPE_QPALETTE:
 847                 if (flags & TEXF_ALPHA)
 848                 {
 849                         flags &= ~TEXF_ALPHA;
 850                         for (i = 0;i < width * height;i++)
 851                         {
 852                                 if (data[i] == 255)
 853                                 {
 854                                         flags |= TEXF_ALPHA;
 855                                         break;
 856                                 }
 857                         }
 858                 }
 859                 break;
 860         case TEXTYPE_RGB:
 861                 if (flags & TEXF_ALPHA)
 862                         Host_Error("R_LoadTexture: RGB has no alpha, don't specify TEXF_ALPHA\n");
 863                 break;
 864         case TEXTYPE_RGBA:
 865                 if (flags & TEXF_ALPHA)
 866                 {
 867                         flags &= ~TEXF_ALPHA;
 868                         for (i = 0;i < width * height;i++)
 869                         {
 870                                 if (data[i * 4 + 3] < 255)
 871                                 {
 872                                         flags |= TEXF_ALPHA;
 873                                         break;
 874                                 }
 875                         }
 876                 }
 877                 break;
 878         default:
 879                 Host_Error("R_LoadTexture: unknown texture type\n");
 880         }
 881
 882         // LordHavoc: do a CRC to confirm the data really is the same as previous occurances.
 883         if (data == NULL)
 884                 crc = 0;
 885         else
 886                 crc = CRC_Block(data, width*height*texinfo->inputbytesperpixel);
 887
 888         // see if the texture is already present
 889         if (identifier && (glt = R_FindTexture(pool, identifier)))
 890         {
 891                 if (crc == glt->crc && width == glt->width && height == glt->height && texinfo == glt->textype && ((flags ^ glt->flags) & TEXF_IMPORTANTBITS) == 0 && ((flags ^ glt->flags) & GLTEXF_IMPORTANTBITS) == 0)
 892                 {
 893                         Con_Printf("R_LoadTexture: exact match with existing texture %s\n", identifier);
 894                         return (rtexture_t *)glt; // exact match, use existing
 895                 }
 896                 Con_Printf("R_LoadTexture: cache mismatch on %s, replacing old texture\n", identifier);
 897                 R_FreeTexture((rtexture_t *)glt);
 898         }
 899
 900         return (rtexture_t *)R_SetupTexture(pool, identifier, crc, width, height, flags | GLTEXF_UPLOAD, texinfo, data);
 901 }
 902
 903 int R_TextureHasAlpha(rtexture_t *rt)
 904 {
 905         gltexture_t *glt;
 906         if (!rt)
 907                 return false;
 908         glt = (gltexture_t *)rt;
 909         return (glt->flags & TEXF_ALPHA) != 0;
 910 }
 911
 912 int R_TextureWidth(rtexture_t *rt)
 913 {
 914         if (!rt)
 915                 return false;
 916         return ((gltexture_t *)rt)->width;
 917 }
 918
 919 int R_TextureHeight(rtexture_t *rt)
 920 {
 921         if (!rt)
 922                 return false;
 923         return ((gltexture_t *)rt)->height;
 924 }
 925
 926 void R_FragmentLocation(rtexture_t *rt, int *x, int *y, float *fx1, float *fy1, float *fx2, float *fy2)
 927 {
 928         gltexture_t *glt;
 929         float iwidth, iheight;
 930         if (cls.state == ca_dedicated)
 931         {
 932                 if (x)
 933                         *x = 0;
 934                 if (y)
 935                         *y = 0;
 936                 if (fx1 || fy1 || fx2 || fy2)
 937                 {
 938                         if (fx1)
 939                                 *fx1 = 0;
 940                         if (fy1)
 941                                 *fy1 = 0;
 942                         if (fx2)
 943                                 *fx2 = 1;
 944                         if (fy2)
 945                                 *fy2 = 1;
 946                 }
 947                 return;
 948         }
 949         if (!rt)
 950                 Host_Error("R_FragmentLocation: no texture supplied\n");
 951         glt = (gltexture_t *)rt;
 952         if (glt->flags & TEXF_FRAGMENT)
 953         {
 954                 if (x)
 955                         *x = glt->x;
 956                 if (y)
 957                         *y = glt->y;
 958                 if (fx1 || fy1 || fx2 || fy2)
 959                 {
 960                         iwidth = 1.0f / glt->image->width;
 961                         iheight = 1.0f / glt->image->height;
 962                         if (fx1)
 963                                 *fx1 = glt->x * iwidth;
 964                         if (fy1)
 965                                 *fy1 = glt->y * iheight;
 966                         if (fx2)
 967                                 *fx2 = (glt->x + glt->width) * iwidth;
 968                         if (fy2)
 969                                 *fy2 = (glt->y + glt->height) * iheight;
 970                 }
 971         }
 972         else
 973         {
 974                 if (x)
 975                         *x = 0;
 976                 if (y)
 977                         *y = 0;
 978                 if (fx1 || fy1 || fx2 || fy2)
 979                 {
 980                         if (fx1)
 981                                 *fx1 = 0;
 982                         if (fy1)
 983                                 *fy1 = 0;
 984                         if (fx2)
 985                                 *fx2 = 1;
 986                         if (fy2)
 987                                 *fy2 = 1;
 988                 }
 989         }
 990 }
 991
 992 int R_CompatibleFragmentWidth(int width, int textype, int flags)
 993 {
 994         textypeinfo_t *texinfo = R_GetTexTypeInfo(textype, flags);
 995         while ((width * texinfo->internalbytesperpixel) & 3)
 996                 width++;
 997         return width;
 998 }
 999
1000 void R_UpdateTexture(rtexture_t *rt, qbyte *data)
1001 {
1002         gltexture_t *glt;
1003         if (rt == NULL)
1004                 Host_Error("R_UpdateTexture: no texture supplied\n");
1005         if (data == NULL)
1006                 Host_Error("R_UpdateTexture: no data supplied\n");
1007         glt = (gltexture_t *)rt;
1008
1009         // if it has not been uploaded yet, update the data that will be used when it is
1010         if (glt->inputtexels)
1011                 memcpy(glt->inputtexels, data, glt->width * glt->height * glt->textype->inputbytesperpixel);
1012         else
1013                 R_Upload(glt, data);
1014 }
1015