gl_textures.c

   1
   2 #include "quakedef.h"
   3 #include "image.h"
   4 #include "jpeg.h"
   5 #include "image_png.h"
   6
   7 cvar_t gl_max_size = {CVAR_SAVE, "gl_max_size", "2048", "maximum allowed texture size, can be used to reduce video memory usage, note: this is automatically reduced to match video card capabilities (such as 256 on 3Dfx cards before Voodoo4/5)"};
   8 cvar_t gl_picmip = {CVAR_SAVE, "gl_picmip", "0", "reduces resolution of textures by powers of 2, for example 1 will halve width/height, reducing texture memory usage by 75%"};
   9 cvar_t r_lerpimages = {CVAR_SAVE, "r_lerpimages", "1", "bilinear filters images when scaling them up to power of 2 size (mode 1), looks better than glquake (mode 0)"};
  10 cvar_t r_precachetextures = {CVAR_SAVE, "r_precachetextures", "1", "0 = never upload textures until used, 1 = upload most textures before use (exceptions: rarely used skin colormap layers), 2 = upload all textures before use (can increase texture memory usage significantly)"};
  11 cvar_t gl_texture_anisotropy = {CVAR_SAVE, "gl_texture_anisotropy", "1", "anisotropic filtering quality (if supported by hardware), 1 sample (no anisotropy) and 8 sample (8 tap anisotropy) are recommended values"};
  12
  13 int             gl_filter_min = GL_LINEAR_MIPMAP_LINEAR;
  14 int             gl_filter_mag = GL_LINEAR;
  15
  16
  17 static mempool_t *texturemempool;
  18
  19 // note: this must not conflict with TEXF_ flags in r_textures.h
  20 // cleared when a texture is uploaded
  21 #define GLTEXF_UPLOAD 0x00010000
  22 // bitmask for mismatch checking
  23 #define GLTEXF_IMPORTANTBITS (0)
  24 // set when image is uploaded and freed
  25 #define GLTEXF_DESTROYED 0x00040000
  26
  27 typedef struct textypeinfo_s
  28 {
  29         int textype;
  30         int inputbytesperpixel;
  31         int internalbytesperpixel;
  32         int glformat;
  33         int glinternalformat;
  34 }
  35 textypeinfo_t;
  36
  37 static textypeinfo_t textype_palette       = {TEXTYPE_PALETTE, 1, 4, GL_RGBA   , 3};
  38 static textypeinfo_t textype_rgb           = {TEXTYPE_RGB    , 3, 3, GL_RGB    , 3};
  39 static textypeinfo_t textype_rgba          = {TEXTYPE_RGBA   , 4, 4, GL_RGBA   , 3};
  40 static textypeinfo_t textype_palette_alpha = {TEXTYPE_PALETTE, 1, 4, GL_RGBA   , 4};
  41 static textypeinfo_t textype_rgba_alpha    = {TEXTYPE_RGBA   , 4, 4, GL_RGBA   , 4};
  42
  43 #define GLTEXTURETYPE_1D 0
  44 #define GLTEXTURETYPE_2D 1
  45 #define GLTEXTURETYPE_3D 2
  46 #define GLTEXTURETYPE_CUBEMAP 3
  47
  48 static int gltexturetypeenums[4] = {GL_TEXTURE_1D, GL_TEXTURE_2D, GL_TEXTURE_3D, GL_TEXTURE_CUBE_MAP_ARB};
  49 static int gltexturetypebindingenums[4] = {GL_TEXTURE_BINDING_1D, GL_TEXTURE_BINDING_2D, GL_TEXTURE_BINDING_3D, GL_TEXTURE_BINDING_CUBE_MAP_ARB};
  50 static int gltexturetypedimensions[4] = {1, 2, 3, 2};
  51 static int cubemapside[6] =
  52 {
  53         GL_TEXTURE_CUBE_MAP_POSITIVE_X_ARB,
  54         GL_TEXTURE_CUBE_MAP_NEGATIVE_X_ARB,
  55         GL_TEXTURE_CUBE_MAP_POSITIVE_Y_ARB,
  56         GL_TEXTURE_CUBE_MAP_NEGATIVE_Y_ARB,
  57         GL_TEXTURE_CUBE_MAP_POSITIVE_Z_ARB,
  58         GL_TEXTURE_CUBE_MAP_NEGATIVE_Z_ARB
  59 };
  60
  61 typedef struct gltexture_s
  62 {
  63         // this field is exposed to the R_GetTexture macro, for speed reasons
  64         // (must be identical in rtexture_t)
  65         int texnum; // GL texture slot number
  66
  67         // pointer to texturepool (check this to see if the texture is allocated)
  68         struct gltexturepool_s *pool;
  69         // pointer to next texture in texturepool chain
  70         struct gltexture_s *chain;
  71         // name of the texture (this might be removed someday), no duplicates
  72         char identifier[32];
  73         // original data size in *inputtexels
  74         int inputwidth, inputheight, inputdepth;
  75         // copy of the original texture(s) supplied to the upload function, for
  76         // delayed uploads (non-precached)
  77         unsigned char *inputtexels;
  78         // original data size in *inputtexels
  79         int inputdatasize;
  80         // flags supplied to the LoadTexture function
  81         // (might be altered to remove TEXF_ALPHA), and GLTEXF_ private flags
  82         int flags;
  83         // pointer to one of the textype_ structs
  84         textypeinfo_t *textype;
  85         // one of the GLTEXTURETYPE_ values
  86         int texturetype;
  87         // palette if the texture is TEXTYPE_PALETTE
  88         const unsigned int *palette;
  89         // power of 2 size, after gl_picmip and gl_max_size are applied
  90         int tilewidth, tileheight, tiledepth;
  91         // 1 or 6 depending on texturetype
  92         int sides;
  93         // bytes per pixel
  94         int bytesperpixel;
  95         // GL_RGB or GL_RGBA
  96         int glformat;
  97         // 3 or 4
  98         int glinternalformat;
  99 }
 100 gltexture_t;
 101
 102 #define TEXTUREPOOL_SENTINEL 0xC0DEDBAD
 103
 104 typedef struct gltexturepool_s
 105 {
 106         unsigned int sentinel;
 107         struct gltexture_s *gltchain;
 108         struct gltexturepool_s *next;
 109 }
 110 gltexturepool_t;
 111
 112 static gltexturepool_t *gltexturepoolchain = NULL;
 113
 114 static unsigned char *resizebuffer = NULL, *colorconvertbuffer;
 115 static int resizebuffersize = 0;
 116 static unsigned char *texturebuffer;
 117 static int texturebuffersize = 0;
 118
 119 static textypeinfo_t *R_GetTexTypeInfo(int textype, int flags)
 120 {
 121         if (flags & TEXF_ALPHA)
 122         {
 123                 switch(textype)
 124                 {
 125                 case TEXTYPE_PALETTE:
 126                         return &textype_palette_alpha;
 127                 case TEXTYPE_RGB:
 128                         Host_Error("R_GetTexTypeInfo: RGB format has no alpha, TEXF_ALPHA not allowed");
 129                         return NULL;
 130                 case TEXTYPE_RGBA:
 131                         return &textype_rgba_alpha;
 132                 default:
 133                         Host_Error("R_GetTexTypeInfo: unknown texture format");
 134                         return NULL;
 135                 }
 136         }
 137         else
 138         {
 139                 switch(textype)
 140                 {
 141                 case TEXTYPE_PALETTE:
 142                         return &textype_palette;
 143                 case TEXTYPE_RGB:
 144                         return &textype_rgb;
 145                 case TEXTYPE_RGBA:
 146                         return &textype_rgba;
 147                 default:
 148                         Host_Error("R_GetTexTypeInfo: unknown texture format");
 149                         return NULL;
 150                 }
 151         }
 152 }
 153
 154 static void R_UploadTexture(gltexture_t *t);
 155
 156 static void R_PrecacheTexture(gltexture_t *glt)
 157 {
 158         int precache;
 159         precache = false;
 160         if (glt->flags & TEXF_ALWAYSPRECACHE)
 161                 precache = true;
 162         else if (r_precachetextures.integer >= 2)
 163                 precache = true;
 164         else if (r_precachetextures.integer >= 1)
 165                 if (glt->flags & TEXF_PRECACHE)
 166                         precache = true;
 167
 168         if (precache)
 169                 R_UploadTexture(glt);
 170 }
 171
 172 int R_RealGetTexture(rtexture_t *rt)
 173 {
 174         if (rt)
 175         {
 176                 gltexture_t *glt;
 177                 glt = (gltexture_t *)rt;
 178                 if (glt->flags & GLTEXF_UPLOAD)
 179                         R_UploadTexture(glt);
 180                 return glt->texnum;
 181         }
 182         else
 183                 return 0;
 184 }
 185
 186 void R_FreeTexture(rtexture_t *rt)
 187 {
 188         gltexture_t *glt, **gltpointer;
 189
 190         glt = (gltexture_t *)rt;
 191         if (glt == NULL)
 192                 Host_Error("R_FreeTexture: texture == NULL");
 193
 194         for (gltpointer = &glt->pool->gltchain;*gltpointer && *gltpointer != glt;gltpointer = &(*gltpointer)->chain);
 195         if (*gltpointer == glt)
 196                 *gltpointer = glt->chain;
 197         else
 198                 Host_Error("R_FreeTexture: texture \"%s\" not linked in pool", glt->identifier);
 199
 200         if (glt->texnum)
 201                 qglDeleteTextures(1, (GLuint *)&glt->texnum);
 202
 203         if (glt->inputtexels)
 204                 Mem_Free(glt->inputtexels);
 205         Mem_Free(glt);
 206 }
 207
 208 rtexturepool_t *R_AllocTexturePool(void)
 209 {
 210         gltexturepool_t *pool;
 211         if (texturemempool == NULL)
 212                 return NULL;
 213         pool = (gltexturepool_t *)Mem_Alloc(texturemempool, sizeof(gltexturepool_t));
 214         if (pool == NULL)
 215                 return NULL;
 216         pool->next = gltexturepoolchain;
 217         gltexturepoolchain = pool;
 218         pool->sentinel = TEXTUREPOOL_SENTINEL;
 219         return (rtexturepool_t *)pool;
 220 }
 221
 222 void R_FreeTexturePool(rtexturepool_t **rtexturepool)
 223 {
 224         gltexturepool_t *pool, **poolpointer;
 225         if (rtexturepool == NULL)
 226                 return;
 227         if (*rtexturepool == NULL)
 228                 return;
 229         pool = (gltexturepool_t *)(*rtexturepool);
 230         *rtexturepool = NULL;
 231         if (pool->sentinel != TEXTUREPOOL_SENTINEL)
 232                 Host_Error("R_FreeTexturePool: pool already freed");
 233         for (poolpointer = &gltexturepoolchain;*poolpointer && *poolpointer != pool;poolpointer = &(*poolpointer)->next);
 234         if (*poolpointer == pool)
 235                 *poolpointer = pool->next;
 236         else
 237                 Host_Error("R_FreeTexturePool: pool not linked");
 238         while (pool->gltchain)
 239                 R_FreeTexture((rtexture_t *)pool->gltchain);
 240         Mem_Free(pool);
 241 }
 242
 243
 244 typedef struct glmode_s
 245 {
 246         char *name;
 247         int minification, magnification;
 248 }
 249 glmode_t;
 250
 251 static glmode_t modes[6] =
 252 {
 253         {"GL_NEAREST", GL_NEAREST, GL_NEAREST},
 254         {"GL_LINEAR", GL_LINEAR, GL_LINEAR},
 255         {"GL_NEAREST_MIPMAP_NEAREST", GL_NEAREST_MIPMAP_NEAREST, GL_NEAREST},
 256         {"GL_LINEAR_MIPMAP_NEAREST", GL_LINEAR_MIPMAP_NEAREST, GL_LINEAR},
 257         {"GL_NEAREST_MIPMAP_LINEAR", GL_NEAREST_MIPMAP_LINEAR, GL_NEAREST},
 258         {"GL_LINEAR_MIPMAP_LINEAR", GL_LINEAR_MIPMAP_LINEAR, GL_LINEAR}
 259 };
 260
 261 static void GL_TextureMode_f (void)
 262 {
 263         int i;
 264         GLint oldbindtexnum;
 265         gltexture_t *glt;
 266         gltexturepool_t *pool;
 267
 268         if (Cmd_Argc() == 1)
 269         {
 270                 for (i = 0;i < 6;i++)
 271                 {
 272                         if (gl_filter_min == modes[i].minification)
 273                         {
 274                                 Con_Printf("%s\n", modes[i].name);
 275                                 return;
 276                         }
 277                 }
 278                 Con_Print("current filter is unknown???\n");
 279                 return;
 280         }
 281
 282         for (i = 0;i < 6;i++)
 283                 if (!strcasecmp (modes[i].name, Cmd_Argv(1) ) )
 284                         break;
 285         if (i == 6)
 286         {
 287                 Con_Print("bad filter name\n");
 288                 return;
 289         }
 290
 291         gl_filter_min = modes[i].minification;
 292         gl_filter_mag = modes[i].magnification;
 293
 294         // change all the existing mipmap texture objects
 295         // FIXME: force renderer(/client/something?) restart instead?
 296         for (pool = gltexturepoolchain;pool;pool = pool->next)
 297         {
 298                 for (glt = pool->gltchain;glt;glt = glt->chain)
 299                 {
 300                         // only update already uploaded images
 301                         if (!(glt->flags & (GLTEXF_UPLOAD | TEXF_FORCENEAREST | TEXF_FORCELINEAR)))
 302                         {
 303                                 qglGetIntegerv(gltexturetypebindingenums[glt->texturetype], &oldbindtexnum);
 304                                 qglBindTexture(gltexturetypeenums[glt->texturetype], glt->texnum);
 305                                 if (glt->flags & TEXF_MIPMAP)
 306                                         qglTexParameteri(gltexturetypeenums[glt->texturetype], GL_TEXTURE_MIN_FILTER, gl_filter_min);
 307                                 else
 308                                         qglTexParameteri(gltexturetypeenums[glt->texturetype], GL_TEXTURE_MIN_FILTER, gl_filter_mag);
 309                                 qglTexParameteri(gltexturetypeenums[glt->texturetype], GL_TEXTURE_MAG_FILTER, gl_filter_mag);
 310                                 qglBindTexture(gltexturetypeenums[glt->texturetype], oldbindtexnum);
 311                         }
 312                 }
 313         }
 314 }
 315
 316 static void GL_Texture_CalcImageSize(int texturetype, int flags, int inwidth, int inheight, int indepth, int *outwidth, int *outheight, int *outdepth)
 317 {
 318         int picmip = 0, maxsize = 0, width2 = 1, height2 = 1, depth2 = 1;
 319
 320         if (gl_max_size.integer > gl_max_texture_size)
 321                 Cvar_SetValue("gl_max_size", gl_max_texture_size);
 322
 323         switch (texturetype)
 324         {
 325         default:
 326         case GLTEXTURETYPE_1D:
 327         case GLTEXTURETYPE_2D:
 328                 maxsize = gl_max_texture_size;
 329                 break;
 330         case GLTEXTURETYPE_3D:
 331                 maxsize = gl_max_3d_texture_size;
 332                 break;
 333         case GLTEXTURETYPE_CUBEMAP:
 334                 maxsize = gl_max_cube_map_texture_size;
 335                 break;
 336         }
 337
 338         if (flags & TEXF_PICMIP)
 339         {
 340                 maxsize = min(maxsize, gl_max_size.integer);
 341                 picmip = gl_picmip.integer;
 342         }
 343
 344         if (outwidth)
 345         {
 346                 for (width2 = 1;width2 < inwidth;width2 <<= 1);
 347                 for (width2 >>= picmip;width2 > maxsize;width2 >>= 1);
 348                 *outwidth = max(1, width2);
 349         }
 350         if (outheight)
 351         {
 352                 for (height2 = 1;height2 < inheight;height2 <<= 1);
 353                 for (height2 >>= picmip;height2 > maxsize;height2 >>= 1);
 354                 *outheight = max(1, height2);
 355         }
 356         if (outdepth)
 357         {
 358                 for (depth2 = 1;depth2 < indepth;depth2 <<= 1);
 359                 for (depth2 >>= picmip;depth2 > maxsize;depth2 >>= 1);
 360                 *outdepth = max(1, depth2);
 361         }
 362 }
 363
 364
 365 static int R_CalcTexelDataSize (gltexture_t *glt)
 366 {
 367         int width2, height2, depth2, size;
 368
 369         GL_Texture_CalcImageSize(glt->texturetype, glt->flags, glt->inputwidth, glt->inputheight, glt->inputdepth, &width2, &height2, &depth2);
 370
 371         size = width2 * height2 * depth2;
 372
 373         if (glt->flags & TEXF_MIPMAP)
 374         {
 375                 while (width2 > 1 || height2 > 1 || depth2 > 1)
 376                 {
 377                         if (width2 > 1)
 378                                 width2 >>= 1;
 379                         if (height2 > 1)
 380                                 height2 >>= 1;
 381                         if (depth2 > 1)
 382                                 depth2 >>= 1;
 383                         size += width2 * height2 * depth2;
 384                 }
 385         }
 386
 387         return size * glt->textype->internalbytesperpixel * glt->sides;
 388 }
 389
 390 void R_TextureStats_Print(qboolean printeach, qboolean printpool, qboolean printtotal)
 391 {
 392         int glsize;
 393         int isloaded;
 394         int pooltotal = 0, pooltotalt = 0, pooltotalp = 0, poolloaded = 0, poolloadedt = 0, poolloadedp = 0;
 395         int sumtotal = 0, sumtotalt = 0, sumtotalp = 0, sumloaded = 0, sumloadedt = 0, sumloadedp = 0;
 396         gltexture_t *glt;
 397         gltexturepool_t *pool;
 398         if (printeach)
 399                 Con_Print("glsize input loaded mip alpha name\n");
 400         for (pool = gltexturepoolchain;pool;pool = pool->next)
 401         {
 402                 pooltotal = 0;
 403                 pooltotalt = 0;
 404                 pooltotalp = 0;
 405                 poolloaded = 0;
 406                 poolloadedt = 0;
 407                 poolloadedp = 0;
 408                 for (glt = pool->gltchain;glt;glt = glt->chain)
 409                 {
 410                         glsize = R_CalcTexelDataSize(glt);
 411                         isloaded = !(glt->flags & GLTEXF_UPLOAD);
 412                         pooltotal++;
 413                         pooltotalt += glsize;
 414                         pooltotalp += glt->inputdatasize;
 415                         if (isloaded)
 416                         {
 417                                 poolloaded++;
 418                                 poolloadedt += glsize;
 419                                 poolloadedp += glt->inputdatasize;
 420                         }
 421                         if (printeach)
 422                                 Con_Printf("%c%4i%c%c%4i%c %s %s %s %s\n", isloaded ? '[' : ' ', (glsize + 1023) / 1024, isloaded ? ']' : ' ', glt->inputtexels ? '[' : ' ', (glt->inputdatasize + 1023) / 1024, glt->inputtexels ? ']' : ' ', isloaded ? "loaded" : "      ", (glt->flags & TEXF_MIPMAP) ? "mip" : "   ", (glt->flags & TEXF_ALPHA) ? "alpha" : "     ", glt->identifier);
 423                 }
 424                 if (printpool)
 425                         Con_Printf("texturepool %10p total: %i (%.3fMB, %.3fMB original), uploaded %i (%.3fMB, %.3fMB original), upload on demand %i (%.3fMB, %.3fMB original)\n", pool, pooltotal, pooltotalt / 1048576.0, pooltotalp / 1048576.0, poolloaded, poolloadedt / 1048576.0, poolloadedp / 1048576.0, pooltotal - poolloaded, (pooltotalt - poolloadedt) / 1048576.0, (pooltotalp - poolloadedp) / 1048576.0);
 426                 sumtotal += pooltotal;
 427                 sumtotalt += pooltotalt;
 428                 sumtotalp += pooltotalp;
 429                 sumloaded += poolloaded;
 430                 sumloadedt += poolloadedt;
 431                 sumloadedp += poolloadedp;
 432         }
 433         if (printtotal)
 434                 Con_Printf("textures total: %i (%.3fMB, %.3fMB original), uploaded %i (%.3fMB, %.3fMB original), upload on demand %i (%.3fMB, %.3fMB original)\n", sumtotal, sumtotalt / 1048576.0, sumtotalp / 1048576.0, sumloaded, sumloadedt / 1048576.0, sumloadedp / 1048576.0, sumtotal - sumloaded, (sumtotalt - sumloadedt) / 1048576.0, (sumtotalp - sumloadedp) / 1048576.0);
 435 }
 436
 437 static void R_TextureStats_f(void)
 438 {
 439         R_TextureStats_Print(true, true, true);
 440 }
 441
 442 static void r_textures_start(void)
 443 {
 444         // LordHavoc: allow any alignment
 445         qglPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 446         CHECKGLERROR
 447
 448         texturemempool = Mem_AllocPool("texture management", 0, NULL);
 449
 450         // Disable JPEG screenshots if the DLL isn't loaded
 451         if (! JPEG_OpenLibrary ())
 452                 Cvar_SetValueQuick (&scr_screenshot_jpeg, 0);
 453         // TODO: support png screenshots?
 454         PNG_OpenLibrary ();
 455 }
 456
 457 static void r_textures_shutdown(void)
 458 {
 459         rtexturepool_t *temp;
 460
 461         JPEG_CloseLibrary ();
 462
 463         while(gltexturepoolchain)
 464         {
 465                 temp = (rtexturepool_t *) gltexturepoolchain;
 466                 R_FreeTexturePool(&temp);
 467         }
 468
 469         resizebuffersize = 0;
 470         texturebuffersize = 0;
 471         resizebuffer = NULL;
 472         colorconvertbuffer = NULL;
 473         texturebuffer = NULL;
 474         Mem_FreePool(&texturemempool);
 475 }
 476
 477 static void r_textures_newmap(void)
 478 {
 479 }
 480
 481 void R_Textures_Init (void)
 482 {
 483         Cmd_AddCommand("gl_texturemode", &GL_TextureMode_f, "set texture filtering mode (GL_NEAREST, GL_LINEAR, GL_LINEAR_MIPMAP_LINEAR, etc)");
 484         Cmd_AddCommand("r_texturestats", R_TextureStats_f, "print information about all loaded textures and some statistics");
 485         Cvar_RegisterVariable (&gl_max_size);
 486         Cvar_RegisterVariable (&gl_picmip);
 487         Cvar_RegisterVariable (&r_lerpimages);
 488         Cvar_RegisterVariable (&r_precachetextures);
 489         Cvar_RegisterVariable (&gl_texture_anisotropy);
 490
 491         R_RegisterModule("R_Textures", r_textures_start, r_textures_shutdown, r_textures_newmap);
 492 }
 493
 494 void R_Textures_Frame (void)
 495 {
 496         static int old_aniso = 0;
 497
 498         // could do procedural texture animation here, if we keep track of which
 499         // textures were accessed this frame...
 500
 501         // free the resize buffers
 502         resizebuffersize = 0;
 503         if (resizebuffer)
 504         {
 505                 Mem_Free(resizebuffer);
 506                 resizebuffer = NULL;
 507         }
 508         if (colorconvertbuffer)
 509         {
 510                 Mem_Free(colorconvertbuffer);
 511                 colorconvertbuffer = NULL;
 512         }
 513
 514         if (old_aniso != gl_texture_anisotropy.integer)
 515         {
 516                 gltexture_t *glt;
 517                 gltexturepool_t *pool;
 518                 GLint oldbindtexnum;
 519
 520                 old_aniso = bound(1, gl_texture_anisotropy.integer, gl_max_anisotropy);
 521
 522                 Cvar_SetValueQuick(&gl_texture_anisotropy, old_aniso);
 523
 524                 for (pool = gltexturepoolchain;pool;pool = pool->next)
 525                 {
 526                         for (glt = pool->gltchain;glt;glt = glt->chain)
 527                         {
 528                                 // only update already uploaded images
 529                                 if ((glt->flags & (GLTEXF_UPLOAD | TEXF_MIPMAP)) == TEXF_MIPMAP)
 530                                 {
 531                                         qglGetIntegerv(gltexturetypebindingenums[glt->texturetype], &oldbindtexnum);
 532
 533                                         qglBindTexture(gltexturetypeenums[glt->texturetype], glt->texnum);
 534                                         qglTexParameteri(gltexturetypeenums[glt->texturetype], GL_TEXTURE_MAX_ANISOTROPY_EXT, old_aniso);CHECKGLERROR
 535
 536                                         qglBindTexture(gltexturetypeenums[glt->texturetype], oldbindtexnum);
 537                                 }
 538                         }
 539                 }
 540         }
 541 }
 542
 543 void R_MakeResizeBufferBigger(int size)
 544 {
 545         if (resizebuffersize < size)
 546         {
 547                 resizebuffersize = size;
 548                 if (resizebuffer)
 549                         Mem_Free(resizebuffer);
 550                 if (colorconvertbuffer)
 551                         Mem_Free(colorconvertbuffer);
 552                 resizebuffer = (unsigned char *)Mem_Alloc(texturemempool, resizebuffersize);
 553                 colorconvertbuffer = (unsigned char *)Mem_Alloc(texturemempool, resizebuffersize);
 554                 if (!resizebuffer || !colorconvertbuffer)
 555                         Host_Error("R_Upload: out of memory");
 556         }
 557 }
 558
 559 static void GL_SetupTextureParameters(int flags, int texturetype)
 560 {
 561         int textureenum = gltexturetypeenums[texturetype];
 562         int wrapmode = ((flags & TEXF_CLAMP) && gl_support_clamptoedge) ? GL_CLAMP_TO_EDGE : GL_REPEAT;
 563
 564         CHECKGLERROR
 565
 566         if (gl_support_anisotropy && (flags & TEXF_MIPMAP))
 567         {
 568                 int aniso = bound(1, gl_texture_anisotropy.integer, gl_max_anisotropy);
 569                 if (gl_texture_anisotropy.integer != aniso)
 570                         Cvar_SetValueQuick(&gl_texture_anisotropy, aniso);
 571                 qglTexParameteri(textureenum, GL_TEXTURE_MAX_ANISOTROPY_EXT, aniso);CHECKGLERROR
 572         }
 573         qglTexParameteri(textureenum, GL_TEXTURE_WRAP_S, wrapmode);CHECKGLERROR
 574         qglTexParameteri(textureenum, GL_TEXTURE_WRAP_T, wrapmode);CHECKGLERROR
 575         if (gltexturetypedimensions[texturetype] >= 3)
 576         {
 577                 qglTexParameteri(textureenum, GL_TEXTURE_WRAP_R, wrapmode);CHECKGLERROR
 578         }
 579
 580         CHECKGLERROR
 581         if (flags & TEXF_FORCENEAREST)
 582         {
 583                 if (flags & TEXF_MIPMAP)
 584                 {
 585                         qglTexParameteri(textureenum, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_NEAREST);CHECKGLERROR
 586                 }
 587                 else
 588                 {
 589                         qglTexParameteri(textureenum, GL_TEXTURE_MIN_FILTER, GL_NEAREST);CHECKGLERROR
 590                 }
 591                 qglTexParameteri(textureenum, GL_TEXTURE_MAG_FILTER, GL_NEAREST);CHECKGLERROR
 592         }
 593         else if (flags & TEXF_FORCELINEAR)
 594         {
 595                 if (flags & TEXF_MIPMAP)
 596                 {
 597                         if (gl_filter_min == GL_NEAREST_MIPMAP_LINEAR || gl_filter_min == GL_LINEAR_MIPMAP_LINEAR)
 598                         {
 599                                 qglTexParameteri(textureenum, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);CHECKGLERROR
 600                         }
 601                         else
 602                         {
 603                                 qglTexParameteri(textureenum, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);CHECKGLERROR
 604                         }
 605                 }
 606                 else
 607                 {
 608                         qglTexParameteri(textureenum, GL_TEXTURE_MIN_FILTER, GL_LINEAR);CHECKGLERROR
 609                 }
 610                 qglTexParameteri(textureenum, GL_TEXTURE_MAG_FILTER, GL_LINEAR);CHECKGLERROR
 611         }
 612         else
 613         {
 614                 if (flags & TEXF_MIPMAP)
 615                 {
 616                         qglTexParameteri(textureenum, GL_TEXTURE_MIN_FILTER, gl_filter_min);CHECKGLERROR
 617                 }
 618                 else
 619                 {
 620                         qglTexParameteri(textureenum, GL_TEXTURE_MIN_FILTER, gl_filter_mag);CHECKGLERROR
 621                 }
 622                 qglTexParameteri(textureenum, GL_TEXTURE_MAG_FILTER, gl_filter_mag);CHECKGLERROR
 623         }
 624
 625         CHECKGLERROR
 626 }
 627
 628 static void R_Upload(gltexture_t *glt, unsigned char *data, int fragx, int fragy, int fragz, int fragwidth, int fragheight, int fragdepth)
 629 {
 630         int i, mip, width, height, depth;
 631         GLint oldbindtexnum;
 632         unsigned char *prevbuffer;
 633         prevbuffer = data;
 634
 635         CHECKGLERROR
 636
 637         // we need to restore the texture binding after finishing the upload
 638         qglGetIntegerv(gltexturetypebindingenums[glt->texturetype], &oldbindtexnum);
 639         qglBindTexture(gltexturetypeenums[glt->texturetype], glt->texnum);
 640         CHECKGLERROR
 641
 642         // these are rounded up versions of the size to do better resampling
 643         for (width  = 1;width  < glt->inputwidth ;width  <<= 1);
 644         for (height = 1;height < glt->inputheight;height <<= 1);
 645         for (depth  = 1;depth  < glt->inputdepth ;depth  <<= 1);
 646
 647         R_MakeResizeBufferBigger(width * height * depth * glt->sides * glt->bytesperpixel);
 648         R_MakeResizeBufferBigger(fragwidth * fragheight * fragdepth * glt->sides * glt->bytesperpixel);
 649
 650         if (prevbuffer == NULL)
 651         {
 652                 memset(resizebuffer, 0, fragwidth * fragheight * fragdepth * glt->bytesperpixel);
 653                 prevbuffer = resizebuffer;
 654         }
 655         else if (glt->textype->textype == TEXTYPE_PALETTE)
 656         {
 657                 // promote paletted to RGBA, so we only have to worry about RGB and
 658                 // RGBA in the rest of this code
 659                 Image_Copy8bitRGBA(prevbuffer, colorconvertbuffer, fragwidth * fragheight * fragdepth * glt->sides, glt->palette);
 660                 prevbuffer = colorconvertbuffer;
 661         }
 662
 663         if ((glt->flags & (TEXF_MIPMAP | TEXF_PICMIP | GLTEXF_UPLOAD)) == 0 && glt->inputwidth == glt->tilewidth && glt->inputheight == glt->tileheight && glt->inputdepth == glt->tiledepth)
 664         {
 665                 // update a portion of the image
 666                 switch(glt->texturetype)
 667                 {
 668                 case GLTEXTURETYPE_1D:
 669                         qglTexSubImage1D(GL_TEXTURE_1D, 0, fragx, fragwidth, glt->glformat, GL_UNSIGNED_BYTE, prevbuffer);
 670                         CHECKGLERROR
 671                         break;
 672                 case GLTEXTURETYPE_2D:
 673                         qglTexSubImage2D(GL_TEXTURE_2D, 0, fragx, fragy, fragwidth, fragheight, glt->glformat, GL_UNSIGNED_BYTE, prevbuffer);
 674                         CHECKGLERROR
 675                         break;
 676                 case GLTEXTURETYPE_3D:
 677                         qglTexSubImage3D(GL_TEXTURE_3D, 0, fragx, fragy, fragz, fragwidth, fragheight, fragdepth, glt->glformat, GL_UNSIGNED_BYTE, prevbuffer);
 678                         CHECKGLERROR
 679                         break;
 680                 default:
 681                         Host_Error("R_Upload: partial update of type other than 1D, 2D, or 3D");
 682                         break;
 683                 }
 684         }
 685         else
 686         {
 687                 if (fragx || fragy || fragz || glt->inputwidth != fragwidth || glt->inputheight != fragheight || glt->inputdepth != fragdepth)
 688                         Host_Error("R_Upload: partial update not allowed on initial upload or in combination with PICMIP or MIPMAP\n");
 689
 690                 // upload the image for the first time
 691                 glt->flags &= ~GLTEXF_UPLOAD;
 692
 693                 // cubemaps contain multiple images and thus get processed a bit differently
 694                 if (glt->texturetype != GLTEXTURETYPE_CUBEMAP)
 695                 {
 696                         if (glt->inputwidth != width || glt->inputheight != height || glt->inputdepth != depth)
 697                         {
 698                                 Image_Resample(prevbuffer, glt->inputwidth, glt->inputheight, glt->inputdepth, resizebuffer, width, height, depth, glt->bytesperpixel, r_lerpimages.integer);
 699                                 prevbuffer = resizebuffer;
 700                         }
 701                         // picmip/max_size
 702                         while (width > glt->tilewidth || height > glt->tileheight || depth > glt->tiledepth)
 703                         {
 704                                 Image_MipReduce(prevbuffer, resizebuffer, &width, &height, &depth, glt->tilewidth, glt->tileheight, glt->tiledepth, glt->bytesperpixel);
 705                                 prevbuffer = resizebuffer;
 706                         }
 707                 }
 708                 mip = 0;
 709                 switch(glt->texturetype)
 710                 {
 711                 case GLTEXTURETYPE_1D:
 712                         qglTexImage1D(GL_TEXTURE_1D, mip++, glt->glinternalformat, width, 0, glt->glformat, GL_UNSIGNED_BYTE, prevbuffer);
 713                         CHECKGLERROR
 714                         if (glt->flags & TEXF_MIPMAP)
 715                         {
 716                                 while (width > 1 || height > 1 || depth > 1)
 717                                 {
 718                                         Image_MipReduce(prevbuffer, resizebuffer, &width, &height, &depth, 1, 1, 1, glt->bytesperpixel);
 719                                         prevbuffer = resizebuffer;
 720                                         qglTexImage1D(GL_TEXTURE_1D, mip++, glt->glinternalformat, width, 0, glt->glformat, GL_UNSIGNED_BYTE, prevbuffer);
 721                                         CHECKGLERROR
 722                                 }
 723                         }
 724                         break;
 725                 case GLTEXTURETYPE_2D:
 726                         qglTexImage2D(GL_TEXTURE_2D, mip++, glt->glinternalformat, width, height, 0, glt->glformat, GL_UNSIGNED_BYTE, prevbuffer);
 727                         CHECKGLERROR
 728                         if (glt->flags & TEXF_MIPMAP)
 729                         {
 730                                 while (width > 1 || height > 1 || depth > 1)
 731                                 {
 732                                         Image_MipReduce(prevbuffer, resizebuffer, &width, &height, &depth, 1, 1, 1, glt->bytesperpixel);
 733                                         prevbuffer = resizebuffer;
 734                                         qglTexImage2D(GL_TEXTURE_2D, mip++, glt->glinternalformat, width, height, 0, glt->glformat, GL_UNSIGNED_BYTE, prevbuffer);
 735                                         CHECKGLERROR
 736                                 }
 737                         }
 738                         break;
 739                 case GLTEXTURETYPE_3D:
 740                         qglTexImage3D(GL_TEXTURE_3D, mip++, glt->glinternalformat, width, height, depth, 0, glt->glformat, GL_UNSIGNED_BYTE, prevbuffer);
 741                         CHECKGLERROR
 742                         if (glt->flags & TEXF_MIPMAP)
 743                         {
 744                                 while (width > 1 || height > 1 || depth > 1)
 745                                 {
 746                                         Image_MipReduce(prevbuffer, resizebuffer, &width, &height, &depth, 1, 1, 1, glt->bytesperpixel);
 747                                         prevbuffer = resizebuffer;
 748                                         qglTexImage3D(GL_TEXTURE_3D, mip++, glt->glinternalformat, width, height, depth, 0, glt->glformat, GL_UNSIGNED_BYTE, prevbuffer);
 749                                         CHECKGLERROR
 750                                 }
 751                         }
 752                         break;
 753                 case GLTEXTURETYPE_CUBEMAP:
 754                         // convert and upload each side in turn,
 755                         // from a continuous block of input texels
 756                         texturebuffer = prevbuffer;
 757                         for (i = 0;i < 6;i++)
 758                         {
 759                                 prevbuffer = texturebuffer;
 760                                 texturebuffer += glt->inputwidth * glt->inputheight * glt->inputdepth * glt->textype->inputbytesperpixel;
 761                                 if (glt->inputwidth != width || glt->inputheight != height || glt->inputdepth != depth)
 762                                 {
 763                                         Image_Resample(prevbuffer, glt->inputwidth, glt->inputheight, glt->inputdepth, resizebuffer, width, height, depth, glt->bytesperpixel, r_lerpimages.integer);
 764                                         prevbuffer = resizebuffer;
 765                                 }
 766                                 // picmip/max_size
 767                                 while (width > glt->tilewidth || height > glt->tileheight || depth > glt->tiledepth)
 768                                 {
 769                                         Image_MipReduce(prevbuffer, resizebuffer, &width, &height, &depth, glt->tilewidth, glt->tileheight, glt->tiledepth, glt->bytesperpixel);
 770                                         prevbuffer = resizebuffer;
 771                                 }
 772                                 mip = 0;
 773                                 qglTexImage2D(cubemapside[i], mip++, glt->glinternalformat, width, height, 0, glt->glformat, GL_UNSIGNED_BYTE, prevbuffer);
 774                                 CHECKGLERROR
 775                                 if (glt->flags & TEXF_MIPMAP)
 776                                 {
 777                                         while (width > 1 || height > 1 || depth > 1)
 778                                         {
 779                                                 Image_MipReduce(prevbuffer, resizebuffer, &width, &height, &depth, 1, 1, 1, glt->bytesperpixel);
 780                                                 prevbuffer = resizebuffer;
 781                                                 qglTexImage2D(cubemapside[i], mip++, glt->glinternalformat, width, height, 0, glt->glformat, GL_UNSIGNED_BYTE, prevbuffer);
 782                                                 CHECKGLERROR
 783                                         }
 784                                 }
 785                         }
 786                         break;
 787                 }
 788                 GL_SetupTextureParameters(glt->flags, glt->texturetype);
 789         }
 790         qglBindTexture(gltexturetypeenums[glt->texturetype], oldbindtexnum);
 791 }
 792
 793 static void R_UploadTexture (gltexture_t *glt)
 794 {
 795         if (!(glt->flags & GLTEXF_UPLOAD))
 796                 return;
 797
 798         qglGenTextures(1, (GLuint *)&glt->texnum);
 799         R_Upload(glt, glt->inputtexels, 0, 0, 0, glt->inputwidth, glt->inputheight, glt->inputdepth);
 800         if (glt->inputtexels)
 801         {
 802                 Mem_Free(glt->inputtexels);
 803                 glt->inputtexels = NULL;
 804                 glt->flags |= GLTEXF_DESTROYED;
 805         }
 806         else if (glt->flags & GLTEXF_DESTROYED)
 807                 Con_Printf("R_UploadTexture: Texture %s already uploaded and destroyed.  Can not upload original image again.  Uploaded blank texture.\n", glt->identifier);
 808 }
 809
 810 static rtexture_t *R_SetupTexture(rtexturepool_t *rtexturepool, const char *identifier, int width, int height, int depth, int sides, int flags, int textype, int texturetype, const unsigned char *data, const unsigned int *palette)
 811 {
 812         int i, size;
 813         gltexture_t *glt;
 814         gltexturepool_t *pool = (gltexturepool_t *)rtexturepool;
 815         textypeinfo_t *texinfo;
 816
 817         if (cls.state == ca_dedicated)
 818                 return NULL;
 819
 820         if (texturetype == GLTEXTURETYPE_CUBEMAP && !gl_texturecubemap)
 821         {
 822                 Con_Printf ("R_LoadTexture: cubemap texture not supported by driver\n");
 823                 return NULL;
 824         }
 825         if (texturetype == GLTEXTURETYPE_3D && !gl_texture3d)
 826         {
 827                 Con_Printf ("R_LoadTexture: 3d texture not supported by driver\n");
 828                 return NULL;
 829         }
 830
 831         texinfo = R_GetTexTypeInfo(textype, flags);
 832         size = width * height * depth * sides * texinfo->inputbytesperpixel;
 833         if (size < 1)
 834         {
 835                 Con_Printf ("R_LoadTexture: bogus texture size (%dx%dx%dx%dbppx%dsides = %d bytes)\n", width, height, depth, texinfo->inputbytesperpixel * 8, sides);
 836                 return NULL;
 837         }
 838
 839         // clear the alpha flag if the texture has no transparent pixels
 840         switch(textype)
 841         {
 842         case TEXTYPE_PALETTE:
 843                 if (flags & TEXF_ALPHA)
 844                 {
 845                         flags &= ~TEXF_ALPHA;
 846                         if (data)
 847                         {
 848                                 for (i = 0;i < size;i++)
 849                                 {
 850                                         if (((unsigned char *)&palette[data[i]])[3] < 255)
 851                                         {
 852                                                 flags |= TEXF_ALPHA;
 853                                                 break;
 854                                         }
 855                                 }
 856                         }
 857                 }
 858                 break;
 859         case TEXTYPE_RGB:
 860                 if (flags & TEXF_ALPHA)
 861                         Host_Error("R_LoadTexture: RGB has no alpha, don't specify TEXF_ALPHA");
 862                 break;
 863         case TEXTYPE_RGBA:
 864                 if (flags & TEXF_ALPHA)
 865                 {
 866                         flags &= ~TEXF_ALPHA;
 867                         if (data)
 868                         {
 869                                 for (i = 3;i < size;i += 4)
 870                                 {
 871                                         if (data[i] < 255)
 872                                         {
 873                                                 flags |= TEXF_ALPHA;
 874                                                 break;
 875                                         }
 876                                 }
 877                         }
 878                 }
 879                 break;
 880         default:
 881                 Host_Error("R_LoadTexture: unknown texture type");
 882         }
 883
 884         glt = (gltexture_t *)Mem_Alloc(texturemempool, sizeof(gltexture_t));
 885         if (identifier)
 886                 strlcpy (glt->identifier, identifier, sizeof(glt->identifier));
 887         glt->pool = pool;
 888         glt->chain = pool->gltchain;
 889         pool->gltchain = glt;
 890         glt->inputwidth = width;
 891         glt->inputheight = height;
 892         glt->inputdepth = depth;
 893         glt->flags = flags | GLTEXF_UPLOAD;
 894         glt->textype = texinfo;
 895         glt->texturetype = texturetype;
 896         glt->inputdatasize = size;
 897         glt->palette = palette;
 898         glt->glinternalformat = texinfo->glinternalformat;
 899         glt->glformat = texinfo->glformat;
 900         glt->bytesperpixel = texinfo->internalbytesperpixel;
 901         glt->sides = glt->texturetype == GLTEXTURETYPE_CUBEMAP ? 6 : 1;
 902         glt->texnum = -1;
 903
 904         if (data)
 905         {
 906                 glt->inputtexels = (unsigned char *)Mem_Alloc(texturemempool, size);
 907                 memcpy(glt->inputtexels, data, size);
 908         }
 909         else
 910                 glt->inputtexels = NULL;
 911
 912         GL_Texture_CalcImageSize(glt->texturetype, glt->flags, glt->inputwidth, glt->inputheight, glt->inputdepth, &glt->tilewidth, &glt->tileheight, &glt->tiledepth);
 913         R_PrecacheTexture(glt);
 914
 915         return (rtexture_t *)glt;
 916 }
 917
 918 rtexture_t *R_LoadTexture1D(rtexturepool_t *rtexturepool, const char *identifier, int width, const unsigned char *data, int textype, int flags, const unsigned int *palette)
 919 {
 920         return R_SetupTexture(rtexturepool, identifier, width, 1, 1, 1, flags, textype, GLTEXTURETYPE_1D, data, palette);
 921 }
 922
 923 rtexture_t *R_LoadTexture2D(rtexturepool_t *rtexturepool, const char *identifier, int width, int height, const unsigned char *data, int textype, int flags, const unsigned int *palette)
 924 {
 925         return R_SetupTexture(rtexturepool, identifier, width, height, 1, 1, flags, textype, GLTEXTURETYPE_2D, data, palette);
 926 }
 927
 928 rtexture_t *R_LoadTexture3D(rtexturepool_t *rtexturepool, const char *identifier, int width, int height, int depth, const unsigned char *data, int textype, int flags, const unsigned int *palette)
 929 {
 930         return R_SetupTexture(rtexturepool, identifier, width, height, depth, 1, flags, textype, GLTEXTURETYPE_3D, data, palette);
 931 }
 932
 933 rtexture_t *R_LoadTextureCubeMap(rtexturepool_t *rtexturepool, const char *identifier, int width, const unsigned char *data, int textype, int flags, const unsigned int *palette)
 934 {
 935         return R_SetupTexture(rtexturepool, identifier, width, width, 1, 6, flags, textype, GLTEXTURETYPE_CUBEMAP, data, palette);
 936 }
 937
 938 int R_TextureHasAlpha(rtexture_t *rt)
 939 {
 940         return rt ? (((gltexture_t *)rt)->flags & TEXF_ALPHA) != 0 : false;
 941 }
 942
 943 int R_TextureWidth(rtexture_t *rt)
 944 {
 945         return rt ? ((gltexture_t *)rt)->inputwidth : 0;
 946 }
 947
 948 int R_TextureHeight(rtexture_t *rt)
 949 {
 950         return rt ? ((gltexture_t *)rt)->inputheight : 0;
 951 }
 952
 953 void R_UpdateTexture(rtexture_t *rt, unsigned char *data, int x, int y, int width, int height)
 954 {
 955         gltexture_t *glt;
 956         if (rt == NULL)
 957                 Host_Error("R_UpdateTexture: no texture supplied");
 958         if (data == NULL)
 959                 Host_Error("R_UpdateTexture: no data supplied");
 960         glt = (gltexture_t *)rt;
 961
 962         // we need it to be uploaded before we can update a part of it
 963         if (glt->flags & GLTEXF_UPLOAD)
 964                 R_UploadTexture(glt);
 965
 966         // update part of the texture
 967         R_Upload(glt, data, x, y, 0, width, height, 1);
 968 }
 969