gl_backend.c

   1
   2 #include "quakedef.h"
   3
   4 cvar_t          r_render = {0, "r_render", "1"};
   5 cvar_t          gl_dither = {CVAR_SAVE, "gl_dither", "1"}; // whether or not to use dithering
   6
   7 int                     lightscalebit;
   8 float           lightscale;
   9 float           overbrightscale;
  10
  11 void SCR_ScreenShot_f (void);
  12 static void R_Envmap_f (void);
  13
  14 static int max_meshs;
  15 static int max_batch;
  16 static int max_verts; // always max_meshs * 3
  17 #define TRANSDEPTHRES 4096
  18
  19 //static cvar_t gl_mesh_maxtriangles = {0, "gl_mesh_maxtriangles", "21760"};
  20 static cvar_t gl_mesh_maxtriangles = {0, "gl_mesh_maxtriangles", "8192"};
  21 static cvar_t gl_mesh_batchtriangles = {0, "gl_mesh_batchtriangles", "1024"};
  22 static cvar_t gl_mesh_merge = {0, "gl_mesh_merge", "1"};
  23 static cvar_t gl_mesh_floatcolors = {0, "gl_mesh_floatcolors", "0"};
  24
  25 typedef struct buf_mesh_s
  26 {
  27         //struct buf_mesh_s *next;
  28         int depthmask;
  29         int depthtest;
  30         int blendfunc1, blendfunc2;
  31         int textures[MAX_TEXTUREUNITS];
  32         float texturergbscale[MAX_TEXTUREUNITS];
  33         int firsttriangle;
  34         int triangles;
  35         int firstvert;
  36         int lastvert;
  37         struct buf_mesh_s *chain;
  38         struct buf_transtri_s *transchain;
  39         //struct buf_transtri_s **transchainpointer;
  40 }
  41 buf_mesh_t;
  42
  43 typedef struct buf_transtri_s
  44 {
  45         struct buf_transtri_s *next;
  46         struct buf_transtri_s *meshsortchain;
  47         buf_mesh_t *mesh;
  48         int index[3];
  49 }
  50 buf_transtri_t;
  51
  52 typedef struct buf_tri_s
  53 {
  54         int index[3];
  55 }
  56 buf_tri_t;
  57
  58 typedef struct
  59 {
  60         float v[4];
  61 }
  62 buf_vertex_t;
  63
  64 typedef struct
  65 {
  66         float c[4];
  67 }
  68 buf_fcolor_t;
  69
  70 typedef struct
  71 {
  72         byte c[4];
  73 }
  74 buf_bcolor_t;
  75
  76 typedef struct
  77 {
  78         float t[2];
  79 }
  80 buf_texcoord_t;
  81
  82 static float meshfarclip;
  83 static int currentmesh, currenttriangle, currentvertex, backendunits, backendactive, meshmerge, transranout;
  84 static buf_mesh_t *buf_mesh;
  85 static buf_tri_t *buf_tri;
  86 static buf_vertex_t *buf_vertex;
  87 static buf_fcolor_t *buf_fcolor;
  88 static buf_bcolor_t *buf_bcolor;
  89 static buf_texcoord_t *buf_texcoord[MAX_TEXTUREUNITS];
  90
  91 static int currenttransmesh, currenttransvertex, currenttranstriangle;
  92 static buf_mesh_t *buf_transmesh;
  93 static buf_transtri_t *buf_transtri;
  94 static buf_transtri_t **buf_transtri_list;
  95 static buf_vertex_t *buf_transvertex;
  96 static buf_fcolor_t *buf_transfcolor;
  97 static buf_texcoord_t *buf_transtexcoord[MAX_TEXTUREUNITS];
  98
  99 static mempool_t *gl_backend_mempool;
 100 static int resizingbuffers = false;
 101
 102 static void gl_backend_start(void)
 103 {
 104         int i;
 105
 106         max_verts = max_meshs * 3;
 107
 108         if (!gl_backend_mempool)
 109                 gl_backend_mempool = Mem_AllocPool("GL_Backend");
 110
 111 #define BACKENDALLOC(var, count, sizeofstruct)\
 112         {\
 113                 var = Mem_Alloc(gl_backend_mempool, count * sizeof(sizeofstruct));\
 114                 if (var == NULL)\
 115                         Sys_Error("gl_backend_start: unable to allocate memory\n");\
 116                 memset(var, 0, count * sizeof(sizeofstruct));\
 117         }
 118
 119         BACKENDALLOC(buf_mesh, max_meshs, buf_mesh_t)
 120         BACKENDALLOC(buf_tri, max_meshs, buf_tri_t)
 121         BACKENDALLOC(buf_vertex, max_verts, buf_vertex_t)
 122         BACKENDALLOC(buf_fcolor, max_verts, buf_fcolor_t)
 123         BACKENDALLOC(buf_bcolor, max_verts, buf_bcolor_t)
 124
 125         BACKENDALLOC(buf_transmesh, max_meshs, buf_mesh_t)
 126         BACKENDALLOC(buf_transtri, max_meshs, buf_transtri_t)
 127         BACKENDALLOC(buf_transtri_list, TRANSDEPTHRES, buf_transtri_t *)
 128         BACKENDALLOC(buf_transvertex, max_verts, buf_vertex_t)
 129         BACKENDALLOC(buf_transfcolor, max_verts, buf_fcolor_t)
 130
 131         for (i = 0;i < MAX_TEXTUREUNITS;i++)
 132         {
 133                 // only allocate as many texcoord arrays as we need
 134                 if (i < gl_textureunits)
 135                 {
 136                         BACKENDALLOC(buf_texcoord[i], max_verts, buf_texcoord_t)
 137                         BACKENDALLOC(buf_transtexcoord[i], max_verts, buf_texcoord_t)
 138                 }
 139                 else
 140                 {
 141                         buf_texcoord[i] = NULL;
 142                         buf_transtexcoord[i] = NULL;
 143                 }
 144         }
 145         backendunits = min(MAX_TEXTUREUNITS, gl_textureunits);
 146         backendactive = true;
 147 }
 148
 149 static void gl_backend_shutdown(void)
 150 {
 151         //int i;
 152         /*
 153 #define BACKENDFREE(var)\
 154         if (var)\
 155         {\
 156                 Mem_Free(var);\
 157                 var = NULL;\
 158         }
 159         */
 160         /*
 161 #define BACKENDFREE(var) var = NULL;
 162
 163         BACKENDFREE(buf_mesh)
 164         BACKENDFREE(buf_tri)
 165         BACKENDFREE(buf_vertex)
 166         BACKENDFREE(buf_fcolor)
 167         BACKENDFREE(buf_bcolor)
 168
 169         BACKENDFREE(buf_transmesh)
 170         BACKENDFREE(buf_transtri)
 171         BACKENDFREE(buf_transtri_list)
 172         BACKENDFREE(buf_transvertex)
 173         BACKENDFREE(buf_transfcolor)
 174
 175         for (i = 0;i < MAX_TEXTUREUNITS;i++)
 176         {
 177                 BACKENDFREE(buf_texcoord[i])
 178                 BACKENDFREE(buf_transtexcoord[i])
 179         }
 180         */
 181
 182         if (resizingbuffers)
 183                 Mem_EmptyPool(gl_backend_mempool);
 184         else
 185                 Mem_FreePool(&gl_backend_mempool);
 186
 187         backendunits = 0;
 188         backendactive = false;
 189 }
 190
 191 static void gl_backend_bufferchanges(int init)
 192 {
 193         // 21760 is (65536 / 3) rounded off to a multiple of 128
 194         if (gl_mesh_maxtriangles.integer < 256)
 195                 Cvar_SetValue("gl_mesh_maxtriangles", 256);
 196         if (gl_mesh_maxtriangles.integer > 21760)
 197                 Cvar_SetValue("gl_mesh_maxtriangles", 21760);
 198
 199         if (gl_mesh_batchtriangles.integer < 0)
 200                 Cvar_SetValue("gl_mesh_batchtriangles", 0);
 201         if (gl_mesh_batchtriangles.integer > gl_mesh_maxtriangles.integer)
 202                 Cvar_SetValue("gl_mesh_batchtriangles", gl_mesh_maxtriangles.integer);
 203
 204         max_batch = gl_mesh_batchtriangles.integer;
 205
 206         if (max_meshs != gl_mesh_maxtriangles.integer)
 207         {
 208                 max_meshs = gl_mesh_maxtriangles.integer;
 209
 210                 if (!init)
 211                 {
 212                         resizingbuffers = true;
 213                         gl_backend_shutdown();
 214                         gl_backend_start();
 215                         resizingbuffers = false;
 216                 }
 217         }
 218 }
 219
 220 float r_farclip, r_newfarclip;
 221
 222 static void gl_backend_newmap(void)
 223 {
 224         r_farclip = r_newfarclip = 2048.0f;
 225 }
 226
 227 int polyindexarray[768];
 228
 229 void gl_backend_init(void)
 230 {
 231         int i;
 232
 233         Cvar_RegisterVariable (&r_render);
 234         Cvar_RegisterVariable (&gl_dither);
 235 #ifdef NORENDER
 236         Cvar_SetValue("r_render", 0);
 237 #endif
 238
 239         Cmd_AddCommand ("screenshot",SCR_ScreenShot_f);
 240         Cmd_AddCommand ("envmap", R_Envmap_f);
 241
 242         Cvar_RegisterVariable(&gl_mesh_maxtriangles);
 243         Cvar_RegisterVariable(&gl_mesh_batchtriangles);
 244         Cvar_RegisterVariable(&gl_mesh_merge);
 245         Cvar_RegisterVariable(&gl_mesh_floatcolors);
 246         R_RegisterModule("GL_Backend", gl_backend_start, gl_backend_shutdown, gl_backend_newmap);
 247         gl_backend_bufferchanges(true);
 248         for (i = 0;i < 256;i++)
 249         {
 250                 polyindexarray[i*3+0] = 0;
 251                 polyindexarray[i*3+1] = i + 1;
 252                 polyindexarray[i*3+2] = i + 2;
 253         }
 254 }
 255
 256 static void MYgluPerspective(GLdouble fovx, GLdouble fovy, GLdouble aspect, GLdouble zNear, GLdouble zFar )
 257 {
 258         GLdouble xmax, ymax;
 259
 260         xmax = zNear * tan( fovx * M_PI / 360.0 ) * aspect;
 261         ymax = zNear * tan( fovy * M_PI / 360.0 );
 262
 263         glFrustum(-xmax, xmax, -ymax, ymax, zNear, zFar );
 264 }
 265
 266
 267 /*
 268 =============
 269 GL_SetupFrame
 270 =============
 271 */
 272 static void GL_SetupFrame (void)
 273 {
 274         if (!r_render.integer)
 275                 return;
 276
 277 //      glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // LordHavoc: moved to SCR_UpdateScreen
 278         gldepthmin = 0;
 279         gldepthmax = 1;
 280         glDepthFunc (GL_LEQUAL);
 281
 282         glDepthRange (gldepthmin, gldepthmax);
 283
 284         // update farclip based on previous frame
 285         r_farclip = r_newfarclip;
 286
 287         // set up viewpoint
 288         glMatrixMode(GL_PROJECTION);
 289         glLoadIdentity ();
 290
 291         // y is weird beause OpenGL is bottom to top, we use top to bottom
 292         glViewport(r_refdef.x, vid.realheight - (r_refdef.y + r_refdef.height), r_refdef.width, r_refdef.height);
 293 //      yfov = 2*atan((float)r_refdef.height/r_refdef.width)*180/M_PI;
 294         MYgluPerspective (r_refdef.fov_x, r_refdef.fov_y, r_refdef.width/r_refdef.height, 4, r_farclip);
 295
 296         glCullFace(GL_FRONT);
 297
 298         glMatrixMode(GL_MODELVIEW);
 299         glLoadIdentity ();
 300
 301         glRotatef (-90,  1, 0, 0);          // put Z going up
 302         glRotatef (90,  0, 0, 1);           // put Z going up
 303         glRotatef (-r_refdef.viewangles[2],  1, 0, 0);
 304         glRotatef (-r_refdef.viewangles[0],  0, 1, 0);
 305         glRotatef (-r_refdef.viewangles[1],  0, 0, 1);
 306         glTranslatef (-r_refdef.vieworg[0],  -r_refdef.vieworg[1],  -r_refdef.vieworg[2]);
 307
 308 //      glGetFloatv (GL_MODELVIEW_MATRIX, r_world_matrix);
 309
 310         //
 311         // set drawing parms
 312         //
 313 //      if (gl_cull.integer)
 314                 glEnable(GL_CULL_FACE);
 315 //      else
 316 //              glDisable(GL_CULL_FACE);
 317
 318         glEnable(GL_BLEND); // was Disable
 319         glEnable(GL_DEPTH_TEST);
 320         glDepthMask(1);
 321 }
 322
 323 static float viewdist;
 324
 325 int c_meshs, c_meshtris, c_transmeshs, c_transtris;
 326
 327 // called at beginning of frame
 328 void R_Mesh_Clear(void)
 329 {
 330         if (!backendactive)
 331                 Sys_Error("R_Mesh_Clear: called when backend is not active\n");
 332
 333         gl_backend_bufferchanges(false);
 334
 335         currentmesh = 0;
 336         currenttriangle = 0;
 337         currentvertex = 0;
 338         currenttransmesh = 0;
 339         currenttranstriangle = 0;
 340         currenttransvertex = 0;
 341         meshfarclip = 0;
 342         meshmerge = gl_mesh_merge.integer;
 343         transranout = false;
 344         viewdist = DotProduct(r_origin, vpn);
 345
 346         c_meshs = 0;
 347         c_meshtris = 0;
 348         c_transmeshs = 0;
 349         c_transtris = 0;
 350
 351         GL_SetupFrame();
 352 }
 353
 354 #ifdef DEBUGGL
 355 void GL_PrintError(int errornumber, char *filename, int linenumber)
 356 {
 357         switch(errornumber)
 358         {
 359         case GL_INVALID_ENUM:
 360                 Con_Printf("GL_INVALID_ENUM at %s:%i\n", filename, linenumber);
 361                 break;
 362         case GL_INVALID_VALUE:
 363                 Con_Printf("GL_INVALID_VALUE at %s:%i\n", filename, linenumber);
 364                 break;
 365         case GL_INVALID_OPERATION:
 366                 Con_Printf("GL_INVALID_OPERATION at %s:%i\n", filename, linenumber);
 367                 break;
 368         case GL_STACK_OVERFLOW:
 369                 Con_Printf("GL_STACK_OVERFLOW at %s:%i\n", filename, linenumber);
 370                 break;
 371         case GL_STACK_UNDERFLOW:
 372                 Con_Printf("GL_STACK_UNDERFLOW at %s:%i\n", filename, linenumber);
 373                 break;
 374         case GL_OUT_OF_MEMORY:
 375                 Con_Printf("GL_OUT_OF_MEMORY at %s:%i\n", filename, linenumber);
 376                 break;
 377 #ifdef GL_TABLE_TOO_LARGE
 378     case GL_TABLE_TOO_LARGE:
 379                 Con_Printf("GL_TABLE_TOO_LARGE at %s:%i\n", filename, linenumber);
 380                 break;
 381 #endif
 382         default:
 383                 Con_Printf("GL UNKNOWN (%i) at %s:%i\n", errornumber, filename, linenumber);
 384                 break;
 385         }
 386 }
 387
 388 int errornumber = 0;
 389 #endif
 390
 391 // renders mesh buffers, called to flush buffers when full
 392 void R_Mesh_Render(void)
 393 {
 394         int i, k, blendfunc1, blendfunc2, blend, depthmask, depthtest, unit = 0, clientunit = 0, firsttriangle, triangles, firstvert, lastvert, texture[MAX_TEXTUREUNITS];
 395         float farclip, texturergbscale[MAX_TEXTUREUNITS];
 396         buf_mesh_t *mesh;
 397         unsigned int *index;
 398         // float to byte color conversion
 399         int *icolor;
 400         float *fcolor;
 401         byte *bcolor;
 402         if (!backendactive)
 403                 Sys_Error("R_Mesh_Render: called when backend is not active\n");
 404         if (!currentmesh)
 405                 return;
 406
 407 CHECKGLERROR
 408
 409         // push out farclip based on vertices
 410         for (i = 0;i < currentvertex;i++)
 411         {
 412                 farclip = DotProduct(buf_vertex[i].v, vpn);
 413                 if (meshfarclip < farclip)
 414                         meshfarclip = farclip;
 415         }
 416
 417         farclip = meshfarclip + 256.0f - viewdist; // + 256 just to be safe
 418
 419         // push out farclip for next frame
 420         if (farclip > r_newfarclip)
 421                 r_newfarclip = ceil((farclip + 255) / 256) * 256 + 256;
 422
 423         for (i = 0;i < backendunits;i++)
 424                 texturergbscale[i] = 1;
 425
 426         glEnable(GL_CULL_FACE);
 427 CHECKGLERROR
 428         glCullFace(GL_FRONT);
 429 CHECKGLERROR
 430         depthtest = true;
 431         glEnable(GL_DEPTH_TEST);
 432 CHECKGLERROR
 433         blendfunc1 = GL_ONE;
 434         blendfunc2 = GL_ZERO;
 435         glBlendFunc(blendfunc1, blendfunc2);
 436 CHECKGLERROR
 437         blend = 0;
 438         glDisable(GL_BLEND);
 439 CHECKGLERROR
 440         depthmask = true;
 441         glDepthMask((GLboolean) depthmask);
 442 CHECKGLERROR
 443
 444         glVertexPointer(3, GL_FLOAT, sizeof(buf_vertex_t), buf_vertex);
 445 CHECKGLERROR
 446         glEnableClientState(GL_VERTEX_ARRAY);
 447 CHECKGLERROR
 448         if (gl_mesh_floatcolors.integer)
 449         {
 450                 glColorPointer(4, GL_FLOAT, sizeof(buf_fcolor_t), buf_fcolor);
 451 CHECKGLERROR
 452         }
 453         else
 454         {
 455                 // shift float to have 8bit fraction at base of number
 456                 for (i = 0, fcolor = &buf_fcolor->c[0];i < currentvertex;i++)
 457                 {
 458                         *fcolor++ += 32768.0f;
 459                         *fcolor++ += 32768.0f;
 460                         *fcolor++ += 32768.0f;
 461                         *fcolor++ += 32768.0f;
 462                 }
 463                 // then read as integer and kill float bits...
 464                 for (i = 0, icolor = (int *)&buf_fcolor->c[0], bcolor = &buf_bcolor->c[0];i < currentvertex;i++)
 465                 {
 466                         k = (*icolor++) & 0x7FFFFF;*bcolor++ = k > 255 ? 255 : k;
 467                         k = (*icolor++) & 0x7FFFFF;*bcolor++ = k > 255 ? 255 : k;
 468                         k = (*icolor++) & 0x7FFFFF;*bcolor++ = k > 255 ? 255 : k;
 469                         k = (*icolor++) & 0x7FFFFF;*bcolor++ = k > 255 ? 255 : k;
 470                 }
 471                 glColorPointer(4, GL_UNSIGNED_BYTE, sizeof(buf_bcolor_t), buf_bcolor);
 472 CHECKGLERROR
 473         }
 474         glEnableClientState(GL_COLOR_ARRAY);
 475 CHECKGLERROR
 476
 477         if (backendunits > 1)
 478         {
 479                 for (i = 0;i < backendunits;i++)
 480                 {
 481                         qglActiveTexture(GL_TEXTURE0_ARB + (unit = i));
 482 CHECKGLERROR
 483                         glBindTexture(GL_TEXTURE_2D, (texture[i] = 0));
 484 CHECKGLERROR
 485                         glDisable(GL_TEXTURE_2D);
 486 CHECKGLERROR
 487                         if (gl_combine.integer)
 488                         {
 489                                 glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);
 490 CHECKGLERROR
 491                                 glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_MODULATE);
 492 CHECKGLERROR
 493                                 glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE);
 494 CHECKGLERROR
 495                                 glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_PREVIOUS_ARB);
 496 CHECKGLERROR
 497                                 glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_RGB_ARB, GL_CONSTANT_ARB);
 498 CHECKGLERROR
 499                                 glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR);
 500 CHECKGLERROR
 501                                 glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);
 502 CHECKGLERROR
 503                                 glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_RGB_ARB, GL_SRC_ALPHA);
 504 CHECKGLERROR
 505                                 glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, GL_MODULATE);
 506 CHECKGLERROR
 507                                 glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA_ARB, GL_TEXTURE);
 508 CHECKGLERROR
 509                                 glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_ALPHA_ARB, GL_PREVIOUS_ARB);
 510 CHECKGLERROR
 511                                 glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_ALPHA_ARB, GL_CONSTANT_ARB);
 512 CHECKGLERROR
 513                                 glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA_ARB, GL_SRC_ALPHA);
 514 CHECKGLERROR
 515                                 glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA_ARB, GL_SRC_ALPHA);
 516 CHECKGLERROR
 517                                 glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_ALPHA_ARB, GL_SRC_ALPHA);
 518 CHECKGLERROR
 519                                 glTexEnvf(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1.0f);
 520 CHECKGLERROR
 521                                 glTexEnvf(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1.0f);
 522 CHECKGLERROR
 523                         }
 524                         else
 525                         {
 526                                 glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 527 CHECKGLERROR
 528                         }
 529
 530                         qglClientActiveTexture(GL_TEXTURE0_ARB + (clientunit = i));
 531 CHECKGLERROR
 532                         glTexCoordPointer(2, GL_FLOAT, sizeof(buf_texcoord_t), buf_texcoord[i]);
 533 CHECKGLERROR
 534                         glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 535 CHECKGLERROR
 536                 }
 537         }
 538         else
 539         {
 540                 glBindTexture(GL_TEXTURE_2D, (texture[0] = 0));
 541 CHECKGLERROR
 542                 glDisable(GL_TEXTURE_2D);
 543 CHECKGLERROR
 544                 glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 545 CHECKGLERROR
 546
 547                 glTexCoordPointer(2, GL_FLOAT, sizeof(buf_texcoord_t), buf_texcoord[0]);
 548 CHECKGLERROR
 549                 glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 550 CHECKGLERROR
 551         }
 552
 553         // lock as early as possible
 554         GL_LockArray(0, currentvertex);
 555 CHECKGLERROR
 556
 557         for (k = 0;k < currentmesh;)
 558         {
 559                 mesh = &buf_mesh[k];
 560
 561                 if (backendunits > 1)
 562                 {
 563 //                      int topunit = 0;
 564                         for (i = 0;i < backendunits;i++)
 565                         {
 566                                 if (texture[i] != mesh->textures[i])
 567                                 {
 568                                         if (unit != i)
 569                                         {
 570                                                 qglActiveTexture(GL_TEXTURE0_ARB + (unit = i));
 571 CHECKGLERROR
 572                                         }
 573                                         if (texture[i] == 0)
 574                                         {
 575                                                 glEnable(GL_TEXTURE_2D);
 576 CHECKGLERROR
 577                                                 // have to disable texcoord array on disabled texture
 578                                                 // units due to NVIDIA driver bug with
 579                                                 // compiled_vertex_array
 580                                                 if (clientunit != i)
 581                                                 {
 582                                                         qglClientActiveTexture(GL_TEXTURE0_ARB + (clientunit = i));
 583 CHECKGLERROR
 584                                                 }
 585                                                 glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 586 CHECKGLERROR
 587                                         }
 588                                         glBindTexture(GL_TEXTURE_2D, (texture[i] = mesh->textures[i]));
 589 CHECKGLERROR
 590                                         if (texture[i] == 0)
 591                                         {
 592                                                 glDisable(GL_TEXTURE_2D);
 593 CHECKGLERROR
 594                                                 // have to disable texcoord array on disabled texture
 595                                                 // units due to NVIDIA driver bug with
 596                                                 // compiled_vertex_array
 597                                                 if (clientunit != i)
 598                                                 {
 599                                                         qglClientActiveTexture(GL_TEXTURE0_ARB + (clientunit = i));
 600 CHECKGLERROR
 601                                                 }
 602                                                 glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 603 CHECKGLERROR
 604                                         }
 605                                 }
 606                                 if (texturergbscale[i] != mesh->texturergbscale[i])
 607                                 {
 608                                         if (unit != i)
 609                                         {
 610                                                 qglActiveTexture(GL_TEXTURE0_ARB + (unit = i));
 611 CHECKGLERROR
 612                                         }
 613                                         glTexEnvf(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, (texturergbscale[i] = mesh->texturergbscale[i]));
 614 CHECKGLERROR
 615                                 }
 616 //                              if (texture[i])
 617 //                                      topunit = i;
 618                         }
 619 //                      if (unit != topunit)
 620 //                      {
 621 //                              qglActiveTexture(GL_TEXTURE0_ARB + (unit = topunit));
 622 //CHECKGLERROR
 623 //                      }
 624                 }
 625                 else
 626                 {
 627                         if (texture[0] != mesh->textures[0])
 628                         {
 629                                 if (texture[0] == 0)
 630                                 {
 631                                         glEnable(GL_TEXTURE_2D);
 632 CHECKGLERROR
 633                                         glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 634 CHECKGLERROR
 635                                 }
 636                                 glBindTexture(GL_TEXTURE_2D, (texture[0] = mesh->textures[0]));
 637 CHECKGLERROR
 638                                 if (texture[0] == 0)
 639                                 {
 640                                         glDisable(GL_TEXTURE_2D);
 641 CHECKGLERROR
 642                                         glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 643 CHECKGLERROR
 644                                 }
 645                         }
 646                 }
 647                 if (blendfunc1 != mesh->blendfunc1 || blendfunc2 != mesh->blendfunc2)
 648                 {
 649                         blendfunc1 = mesh->blendfunc1;
 650                         blendfunc2 = mesh->blendfunc2;
 651                         glBlendFunc(blendfunc1, blendfunc2);
 652 CHECKGLERROR
 653                         if (blendfunc2 == GL_ZERO)
 654                         {
 655                                 if (blendfunc1 == GL_ONE)
 656                                 {
 657                                         if (blend)
 658                                         {
 659                                                 blend = 0;
 660                                                 glDisable(GL_BLEND);
 661 CHECKGLERROR
 662                                         }
 663                                 }
 664                                 else
 665                                 {
 666                                         if (!blend)
 667                                         {
 668                                                 blend = 1;
 669                                                 glEnable(GL_BLEND);
 670 CHECKGLERROR
 671                                         }
 672                                 }
 673                         }
 674                         else
 675                         {
 676                                 if (!blend)
 677                                 {
 678                                         blend = 1;
 679                                         glEnable(GL_BLEND);
 680 CHECKGLERROR
 681                                 }
 682                         }
 683                 }
 684                 if (depthtest != mesh->depthtest)
 685                 {
 686                         depthtest = mesh->depthtest;
 687                         if (depthtest)
 688                                 glEnable(GL_DEPTH_TEST);
 689                         else
 690                                 glDisable(GL_DEPTH_TEST);
 691                 }
 692                 if (depthmask != mesh->depthmask)
 693                 {
 694                         depthmask = mesh->depthmask;
 695                         glDepthMask((GLboolean) depthmask);
 696 CHECKGLERROR
 697                 }
 698
 699                 firsttriangle = mesh->firsttriangle;
 700                 triangles = mesh->triangles;
 701                 firstvert = mesh->firstvert;
 702                 lastvert = mesh->lastvert;
 703                 mesh = &buf_mesh[++k];
 704
 705                 if (meshmerge)
 706                 {
 707                         #if MAX_TEXTUREUNITS != 4
 708                         #error update this code
 709                         #endif
 710                         while (k < currentmesh
 711                                 && mesh->blendfunc1 == blendfunc1
 712                                 && mesh->blendfunc2 == blendfunc2
 713                                 && mesh->depthtest == depthtest
 714                                 && mesh->depthmask == depthmask
 715                                 && mesh->textures[0] == texture[0]
 716                                 && mesh->textures[1] == texture[1]
 717                                 && mesh->textures[2] == texture[2]
 718                                 && mesh->textures[3] == texture[3]
 719                                 && mesh->texturergbscale[0] == texturergbscale[0]
 720                                 && mesh->texturergbscale[1] == texturergbscale[1]
 721                                 && mesh->texturergbscale[2] == texturergbscale[2]
 722                                 && mesh->texturergbscale[3] == texturergbscale[3])
 723                         {
 724                                 triangles += mesh->triangles;
 725                                 if (firstvert > mesh->firstvert)
 726                                         firstvert = mesh->firstvert;
 727                                 if (lastvert < mesh->lastvert)
 728                                         lastvert = mesh->lastvert;
 729                                 mesh = &buf_mesh[++k];
 730                         }
 731                 }
 732
 733                 index = (unsigned int *)&buf_tri[firsttriangle].index[0];
 734                 for (i = 0;i < triangles * 3;i++)
 735                         index[i] += firstvert;
 736
 737 #ifdef WIN32
 738                 // FIXME: dynamic link to GL so we can get DrawRangeElements on WIN32
 739                 glDrawElements(GL_TRIANGLES, triangles * 3, GL_UNSIGNED_INT, index);
 740 #else
 741                 glDrawRangeElements(GL_TRIANGLES, firstvert, lastvert + 1, triangles * 3, GL_UNSIGNED_INT, index);
 742 #endif
 743 CHECKGLERROR
 744         }
 745
 746         currentmesh = 0;
 747         currenttriangle = 0;
 748         currentvertex = 0;
 749
 750         GL_UnlockArray();
 751 CHECKGLERROR
 752
 753         if (backendunits > 1)
 754         {
 755                 for (i = backendunits - 1;i >= 0;i--)
 756                 {
 757                         qglActiveTexture(GL_TEXTURE0_ARB + (unit = i));
 758 CHECKGLERROR
 759                         glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 760 CHECKGLERROR
 761                         if (gl_combine.integer)
 762                         {
 763                                 glTexEnvf(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1.0f);
 764 CHECKGLERROR
 765                         }
 766                         if (i > 0)
 767                         {
 768                                 glDisable(GL_TEXTURE_2D);
 769 CHECKGLERROR
 770                         }
 771                         else
 772                         {
 773                                 glEnable(GL_TEXTURE_2D);
 774 CHECKGLERROR
 775                         }
 776                         glBindTexture(GL_TEXTURE_2D, 0);
 777 CHECKGLERROR
 778
 779                         qglClientActiveTexture(GL_TEXTURE0_ARB + (clientunit = i));
 780 CHECKGLERROR
 781                         glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 782 CHECKGLERROR
 783                 }
 784         }
 785         else
 786         {
 787                 glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 788 CHECKGLERROR
 789                 glEnable(GL_TEXTURE_2D);
 790 CHECKGLERROR
 791                 glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 792 CHECKGLERROR
 793         }
 794         glDisableClientState(GL_COLOR_ARRAY);
 795 CHECKGLERROR
 796         glDisableClientState(GL_VERTEX_ARRAY);
 797 CHECKGLERROR
 798
 799         glDisable(GL_BLEND);
 800 CHECKGLERROR
 801         glEnable(GL_DEPTH_TEST);
 802 CHECKGLERROR
 803         glDepthMask(true);
 804 CHECKGLERROR
 805         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 806 CHECKGLERROR
 807 }
 808
 809 void R_Mesh_AddTransparent(void)
 810 {
 811         int i, j, k;
 812         float viewdistcompare, centerscaler, dist1, dist2, dist3, center, maxdist;
 813         buf_vertex_t *vert1, *vert2, *vert3;
 814         buf_transtri_t *tri;
 815         buf_mesh_t *mesh, *transmesh;
 816
 817         if (!currenttransmesh)
 818                 return;
 819
 820         /*
 821         // convert index data to transtris for sorting
 822         for (i = 0;i < currenttransmesh;i++)
 823         {
 824                 mesh = buf_transmesh + i;
 825                 j = mesh->firstvert;
 826                 index = mesh->index;
 827                 for (i = 0;i < mesh->numtriangles;i++)
 828                 {
 829                         tri = &buf_transtri[currenttranstriangle++];
 830                         tri->mesh = mesh;
 831                         tri->index[0] = *index++ + j;
 832                         tri->index[1] = *index++ + j;
 833                         tri->index[2] = *index++ + j;
 834                 }
 835         }
 836         */
 837
 838         // map farclip to 0-4095 list range
 839         centerscaler = (TRANSDEPTHRES / r_farclip) * (1.0f / 3.0f);
 840         viewdistcompare = viewdist + 4.0f;
 841
 842         memset(buf_transtri_list, 0, TRANSDEPTHRES * sizeof(buf_transtri_t *));
 843
 844         k = 0;
 845         for (j = 0;j < currenttranstriangle;j++)
 846         {
 847                 tri = &buf_transtri[j];
 848                 i = tri->mesh->firstvert;
 849
 850                 vert1 = &buf_transvertex[tri->index[0] + i];
 851                 vert2 = &buf_transvertex[tri->index[1] + i];
 852                 vert3 = &buf_transvertex[tri->index[2] + i];
 853
 854                 dist1 = DotProduct(vert1->v, vpn);
 855                 dist2 = DotProduct(vert2->v, vpn);
 856                 dist3 = DotProduct(vert3->v, vpn);
 857
 858                 maxdist = max(dist1, max(dist2, dist3));
 859                 if (maxdist < viewdistcompare)
 860                         continue;
 861
 862                 center = (dist1 + dist2 + dist3) * centerscaler - viewdist;
 863 #if SLOWMATH
 864                 i = (int) center;
 865                 i = bound(0, i, (TRANSDEPTHRES - 1));
 866 #else
 867                 if (center < 0.0f)
 868                         center = 0.0f;
 869                 center += 8388608.0f;
 870                 i = *((long *)&center) & 0x7FFFFF;
 871                 i = min(i, (TRANSDEPTHRES - 1));
 872 #endif
 873                 tri->next = buf_transtri_list[i];
 874                 buf_transtri_list[i] = tri;
 875                 k++;
 876         }
 877
 878         if (currentmesh + k > max_meshs || currenttriangle + k > max_batch || currentvertex + currenttransvertex > max_verts)
 879                 R_Mesh_Render();
 880
 881         for (i = 0;i < currenttransmesh;i++)
 882                 buf_transmesh[i].transchain = NULL;
 883         transmesh = NULL;
 884         for (j = 0;j < TRANSDEPTHRES;j++)
 885         {
 886                 if ((tri = buf_transtri_list[j]))
 887                 {
 888                         for (;tri;tri = tri->next)
 889                         {
 890                                 if (!tri->mesh->transchain)
 891                                 {
 892                                         tri->mesh->chain = transmesh;
 893                                         transmesh = tri->mesh;
 894                                 }
 895                                 tri->meshsortchain = tri->mesh->transchain;
 896                                 tri->mesh->transchain = tri;
 897                         }
 898                 }
 899         }
 900
 901         for (;transmesh;transmesh = transmesh->chain)
 902         {
 903                 int numverts = transmesh->lastvert - transmesh->firstvert + 1;
 904                 //if (currentmesh >= max_meshs || currenttriangle + transmesh->triangles > max_batch || currentvertex + numverts > max_verts)
 905                 //      R_Mesh_Render();
 906
 907                 memcpy(&buf_vertex[currentvertex], &buf_transvertex[transmesh->firstvert], numverts * sizeof(buf_vertex_t));
 908                 memcpy(&buf_fcolor[currentvertex], &buf_transfcolor[transmesh->firstvert], numverts * sizeof(buf_fcolor_t));
 909                 for (i = 0;i < backendunits && transmesh->textures[i];i++)
 910                         memcpy(&buf_texcoord[i][currentvertex], &buf_transtexcoord[i][transmesh->firstvert], numverts * sizeof(buf_texcoord_t));
 911
 912                 mesh = &buf_mesh[currentmesh++];
 913                 *mesh = *transmesh; // copy mesh properties
 914                 mesh->firstvert = currentvertex;
 915                 mesh->lastvert = currentvertex + numverts - 1;
 916                 currentvertex += numverts;
 917                 mesh->firsttriangle = currenttriangle;
 918                 for (tri = transmesh->transchain;tri;tri = tri->meshsortchain)
 919                 {
 920                         buf_tri[currenttriangle].index[0] = tri->index[0];
 921                         buf_tri[currenttriangle].index[1] = tri->index[1];
 922                         buf_tri[currenttriangle].index[2] = tri->index[2];
 923                         currenttriangle++;
 924                 }
 925                 mesh->triangles = currenttriangle - mesh->firsttriangle;
 926         }
 927
 928         currenttransmesh = 0;
 929         currenttranstriangle = 0;
 930         currenttransvertex = 0;
 931 }
 932
 933 void R_Mesh_Draw(const rmeshinfo_t *m)
 934 {
 935         // these are static because gcc runs out of virtual registers otherwise
 936         static int i, j, *index, overbright;
 937         static float *in, scaler;
 938         static float cr, cg, cb, ca;
 939         static buf_mesh_t *mesh;
 940         static buf_vertex_t *vert;
 941         static buf_fcolor_t *fcolor;
 942         static buf_texcoord_t *texcoord[MAX_TEXTUREUNITS];
 943         static buf_transtri_t *tri;
 944
 945         if (!backendactive)
 946                 Sys_Error("R_Mesh_Draw: called when backend is not active\n");
 947
 948         if (m->index == NULL
 949          || !m->numtriangles
 950          || m->vertex == NULL
 951          || !m->numverts)
 952                 Host_Error("R_Mesh_Draw: no triangles or verts\n");
 953
 954         // ignore meaningless alpha meshs
 955         if (!m->depthwrite && m->blendfunc1 == GL_SRC_ALPHA && (m->blendfunc2 == GL_ONE || m->blendfunc2 == GL_ONE_MINUS_SRC_ALPHA))
 956         {
 957                 if (m->color)
 958                 {
 959                         for (i = 0, in = m->color + 3;i < m->numverts;i++, (int)in += m->colorstep)
 960                                 if (*in >= 0.01f)
 961                                         break;
 962                         if (i == m->numverts)
 963                                 return;
 964                 }
 965                 else if (m->ca < 0.01f)
 966                         return;
 967         }
 968
 969         if (!backendactive)
 970                 Sys_Error("R_Mesh_Draw: called when backend is not active\n");
 971
 972         scaler = 1;
 973         if (m->blendfunc2 == GL_SRC_COLOR)
 974         {
 975                 if (m->blendfunc1 == GL_DST_COLOR) // 2x modulate with framebuffer
 976                         scaler *= 0.5f;
 977         }
 978         else
 979         {
 980                 if (m->tex[0])
 981                 {
 982                         overbright = gl_combine.integer;
 983                         if (overbright)
 984                                 scaler *= 0.25f;
 985                 }
 986                 scaler *= overbrightscale;
 987         }
 988
 989         if (m->transparent)
 990         {
 991                 if (currenttransmesh >= max_meshs || (currenttranstriangle + m->numtriangles) > max_meshs || (currenttransvertex + m->numverts) > max_verts)
 992                 {
 993                         if (!transranout)
 994                         {
 995                                 Con_Printf("R_Mesh_Draw: ran out of room for transparent meshs\n");
 996                                 transranout = true;
 997                         }
 998                         return;
 999                 }
1000
1001                 c_transmeshs++;
1002                 c_transtris += m->numtriangles;
1003                 vert = &buf_transvertex[currenttransvertex];
1004                 fcolor = &buf_transfcolor[currenttransvertex];
1005                 for (i = 0;i < backendunits;i++)
1006                         texcoord[i] = &buf_transtexcoord[i][currenttransvertex];
1007
1008                 // transmesh is only for storage of transparent meshs until they
1009                 // are inserted into the main mesh array
1010                 mesh = &buf_transmesh[currenttransmesh++];
1011
1012                 // transparent meshs are broken up into individual triangles which can
1013                 // be sorted by depth
1014                 index = m->index;
1015                 for (i = 0;i < m->numtriangles;i++)
1016                 {
1017                         tri = &buf_transtri[currenttranstriangle++];
1018                         tri->mesh = mesh;
1019                         tri->index[0] = *index++;
1020                         tri->index[1] = *index++;
1021                         tri->index[2] = *index++;
1022                 }
1023
1024                 mesh->firstvert = currenttransvertex;
1025                 mesh->lastvert = currenttransvertex + m->numverts - 1;
1026                 currenttransvertex += m->numverts;
1027         }
1028         else
1029         {
1030                 if (m->numtriangles > max_meshs || m->numverts > max_verts)
1031                 {
1032                         Con_Printf("R_Mesh_Draw: mesh too big for buffers\n");
1033                         return;
1034                 }
1035
1036                 if (currentmesh >= max_meshs || (currenttriangle + m->numtriangles) > max_batch || (currentvertex + m->numverts) > max_verts)
1037                         R_Mesh_Render();
1038
1039                 c_meshs++;
1040                 c_meshtris += m->numtriangles;
1041                 vert = &buf_vertex[currentvertex];
1042                 fcolor = &buf_fcolor[currentvertex];
1043                 for (i = 0;i < backendunits;i++)
1044                         texcoord[i] = &buf_texcoord[i][currentvertex];
1045
1046                 mesh = &buf_mesh[currentmesh++];
1047                 // opaque meshs are rendered directly
1048                 mesh->firsttriangle = currenttriangle;
1049                 memcpy(&buf_tri[currenttriangle].index[0], m->index, sizeof(float[3]) * m->numtriangles);
1050                 currenttriangle += m->numtriangles;
1051
1052                 mesh->firstvert = currentvertex;
1053                 mesh->lastvert = currentvertex + m->numverts - 1;
1054                 currentvertex += m->numverts;
1055         }
1056
1057         // code shared for transparent and opaque meshs
1058         mesh->blendfunc1 = m->blendfunc1;
1059         mesh->blendfunc2 = m->blendfunc2;
1060         mesh->depthmask = (m->blendfunc2 == GL_ZERO || m->depthwrite);
1061         mesh->depthtest = !m->depthdisable;
1062         mesh->triangles = m->numtriangles;
1063         j = -1;
1064         for (i = 0;i < backendunits;i++)
1065         {
1066                 if ((mesh->textures[i] = m->tex[i]))
1067                         j = i;
1068                 mesh->texturergbscale[i] = m->texrgbscale[i];
1069                 if (mesh->texturergbscale[i] != 1 && mesh->texturergbscale[i] != 2 && mesh->texturergbscale[i] != 4)
1070                         mesh->texturergbscale[i] = 1;
1071         }
1072         if (overbright && j >= 0)
1073                 mesh->texturergbscale[j] = 4;
1074
1075         if (m->vertexstep != sizeof(buf_vertex_t))
1076         {
1077                 for (i = 0, in = m->vertex;i < m->numverts;i++, (int)in += m->vertexstep)
1078                 {
1079                         vert[i].v[0] = in[0];
1080                         vert[i].v[1] = in[1];
1081                         vert[i].v[2] = in[2];
1082                 }
1083         }
1084         else
1085                 memcpy(vert, m->vertex, m->numverts * sizeof(buf_vertex_t));
1086
1087         if (m->color)
1088         {
1089                 for (i = 0, in = m->color;i < m->numverts;i++, (int)in += m->colorstep)
1090                 {
1091                         fcolor[i].c[0] = in[0] * scaler;
1092                         fcolor[i].c[1] = in[1] * scaler;
1093                         fcolor[i].c[2] = in[2] * scaler;
1094                         fcolor[i].c[3] = in[3];
1095                 }
1096         }
1097         else
1098         {
1099                 cr = m->cr * scaler;
1100                 cg = m->cg * scaler;
1101                 cb = m->cb * scaler;
1102                 ca = m->ca;
1103                 for (i = 0;i < m->numverts;i++)
1104                 {
1105                         fcolor[i].c[0] = cr;
1106                         fcolor[i].c[1] = cg;
1107                         fcolor[i].c[2] = cb;
1108                         fcolor[i].c[3] = ca;
1109                 }
1110         }
1111
1112         for (j = 0;j < MAX_TEXTUREUNITS && m->tex[j];j++)
1113         {
1114                 if (j >= backendunits)
1115                         Sys_Error("R_Mesh_Draw: texture %i supplied when there are only %i texture units\n", j + 1, backendunits);
1116                 if (m->texcoordstep[j] != sizeof(buf_texcoord_t))
1117                 {
1118                         for (i = 0, in = m->texcoords[j];i < m->numverts;i++, (int)in += m->texcoordstep[j])
1119                         {
1120                                 texcoord[j][i].t[0] = in[0];
1121                                 texcoord[j][i].t[1] = in[1];
1122                         }
1123                 }
1124                 else
1125                         memcpy(&texcoord[j][0].t[0], m->texcoords[j], m->numverts * sizeof(buf_texcoord_t));
1126         }
1127         #if 0
1128         for (;j < backendunits;j++)
1129                 memset(&texcoord[j][0].t[0], 0, m->numverts * sizeof(buf_texcoord_t));
1130         #endif
1131
1132         if (currenttriangle >= max_batch)
1133                 R_Mesh_Render();
1134 }
1135
1136 void R_Mesh_Draw_NativeOnly(const rmeshinfo_t *m)
1137 {
1138         // these are static because gcc runs out of virtual registers otherwise
1139         static int i, j, *index, overbright;
1140         static float *in, scaler;
1141         static buf_mesh_t *mesh;
1142         static buf_vertex_t *vert;
1143         static buf_fcolor_t *fcolor;
1144         static buf_texcoord_t *texcoord[MAX_TEXTUREUNITS];
1145         static buf_transtri_t *tri;
1146
1147         if (!backendactive)
1148                 Sys_Error("R_Mesh_Draw: called when backend is not active\n");
1149
1150         if (m->index == NULL
1151          || !m->numtriangles
1152          || m->vertex == NULL
1153          || !m->numverts)
1154                 Host_Error("R_Mesh_Draw: no triangles or verts\n");
1155
1156         // ignore meaningless alpha meshs
1157         if (!m->depthwrite && m->blendfunc1 == GL_SRC_ALPHA && (m->blendfunc2 == GL_ONE || m->blendfunc2 == GL_ONE_MINUS_SRC_ALPHA))
1158         {
1159                 if (m->color)
1160                 {
1161                         for (i = 0, in = m->color + 3;i < m->numverts;i++, (int)in += m->colorstep)
1162                                 if (*in >= 0.01f)
1163                                         break;
1164                         if (i == m->numverts)
1165                                 return;
1166                 }
1167                 else if (m->ca < 0.01f)
1168                         return;
1169         }
1170
1171         scaler = 1;
1172         if (m->blendfunc2 == GL_SRC_COLOR)
1173         {
1174                 if (m->blendfunc1 == GL_DST_COLOR) // 2x modulate with framebuffer
1175                         scaler *= 0.5f;
1176         }
1177         else
1178         {
1179                 if (m->tex[0])
1180                 {
1181                         overbright = gl_combine.integer;
1182                         if (overbright)
1183                                 scaler *= 0.25f;
1184                 }
1185                 scaler *= overbrightscale;
1186         }
1187
1188         if (m->transparent)
1189         {
1190                 if (currenttransmesh >= max_meshs || (currenttranstriangle + m->numtriangles) > max_meshs || (currenttransvertex + m->numverts) > max_verts)
1191                 {
1192                         if (!transranout)
1193                         {
1194                                 Con_Printf("R_Mesh_Draw_NativeOnly: ran out of room for transparent meshs\n");
1195                                 transranout = true;
1196                         }
1197                         return;
1198                 }
1199
1200                 c_transmeshs++;
1201                 c_transtris += m->numtriangles;
1202                 vert = &buf_transvertex[currenttransvertex];
1203                 fcolor = &buf_transfcolor[currenttransvertex];
1204                 for (i = 0;i < backendunits;i++)
1205                         texcoord[i] = &buf_transtexcoord[i][currenttransvertex];
1206
1207                 // transmesh is only for storage of transparent meshs until they
1208                 // are inserted into the main mesh array
1209                 mesh = &buf_transmesh[currenttransmesh++];
1210
1211                 // transparent meshs are broken up into individual triangles which can
1212                 // be sorted by depth
1213                 index = m->index;
1214                 for (i = 0;i < m->numtriangles;i++)
1215                 {
1216                         tri = &buf_transtri[currenttranstriangle++];
1217                         tri->mesh = mesh;
1218                         tri->index[0] = *index++;
1219                         tri->index[1] = *index++;
1220                         tri->index[2] = *index++;
1221                 }
1222
1223                 mesh->firstvert = currenttransvertex;
1224                 mesh->lastvert = currenttransvertex + m->numverts - 1;
1225                 currenttransvertex += m->numverts;
1226         }
1227         else
1228         {
1229                 if (m->numtriangles > max_meshs || m->numverts > max_verts)
1230                 {
1231                         Con_Printf("R_Mesh_Draw_NativeOnly: mesh too big for buffers\n");
1232                         return;
1233                 }
1234
1235                 if (currentmesh >= max_meshs || (currenttriangle + m->numtriangles) > max_batch || (currentvertex + m->numverts) > max_verts)
1236                         R_Mesh_Render();
1237
1238                 c_meshs++;
1239                 c_meshtris += m->numtriangles;
1240                 vert = &buf_vertex[currentvertex];
1241                 fcolor = &buf_fcolor[currentvertex];
1242                 for (i = 0;i < backendunits;i++)
1243                         texcoord[i] = &buf_texcoord[i][currentvertex];
1244
1245                 mesh = &buf_mesh[currentmesh++];
1246                 // opaque meshs are rendered directly
1247                 mesh->firsttriangle = currenttriangle;
1248                 memcpy(&buf_tri[currenttriangle].index[0], m->index, sizeof(float[3]) * m->numtriangles);
1249                 currenttriangle += m->numtriangles;
1250
1251                 mesh->firstvert = currentvertex;
1252                 mesh->lastvert = currentvertex + m->numverts - 1;
1253                 currentvertex += m->numverts;
1254         }
1255
1256         // code shared for transparent and opaque meshs
1257         mesh->blendfunc1 = m->blendfunc1;
1258         mesh->blendfunc2 = m->blendfunc2;
1259         mesh->depthmask = (m->blendfunc2 == GL_ZERO || m->depthwrite);
1260         mesh->depthtest = !m->depthdisable;
1261         mesh->triangles = m->numtriangles;
1262         j = -1;
1263         for (i = 0;i < backendunits;i++)
1264         {
1265                 if ((mesh->textures[i] = m->tex[i]))
1266                         j = i;
1267                 mesh->texturergbscale[i] = m->texrgbscale[i];
1268                 if (mesh->texturergbscale[i] != 1 && mesh->texturergbscale[i] != 2 && mesh->texturergbscale[i] != 4)
1269                         mesh->texturergbscale[i] = 1;
1270         }
1271         if (overbright && j >= 0)
1272                 mesh->texturergbscale[j] = 4;
1273
1274         if (m->vertexstep != sizeof(buf_vertex_t))
1275                 Host_Error("R_Mesh_Draw_NativeOnly: unsupported vertexstep\n");
1276         if (m->colorstep != sizeof(buf_fcolor_t))
1277                 Host_Error("R_Mesh_Draw_NativeOnly: unsupported colorstep\n");
1278         if (m->color == NULL)
1279                 Host_Error("R_Mesh_Draw_NativeOnly: must provide color array\n");
1280         for (j = 0;j < MAX_TEXTUREUNITS && m->tex[j];j++)
1281         {
1282                 if (j >= backendunits)
1283                         Sys_Error("R_Mesh_Draw_NativeOnly: texture %i supplied when there are only %i texture units\n", j + 1, backendunits);
1284                 if (m->texcoordstep[j] != sizeof(buf_texcoord_t))
1285                         Host_Error("R_Mesh_Draw_NativeOnly: unsupported texcoordstep\n");
1286         }
1287
1288         memcpy(vert, m->vertex, m->numverts * sizeof(buf_vertex_t));
1289         for (j = 0;j < MAX_TEXTUREUNITS && m->tex[j];j++)
1290                 memcpy(&texcoord[j][0].t[0], m->texcoords[j], m->numverts * sizeof(buf_texcoord_t));
1291         #if 0
1292         for (;j < backendunits;j++)
1293                 memset(&texcoord[j][0].t[0], 0, m->numverts * sizeof(buf_texcoord_t));
1294         #endif
1295
1296         memcpy(fcolor, m->color, m->numverts * sizeof(buf_fcolor_t));
1297
1298         // do this as a second step because memcpy preloaded the cache, which we can't easily do
1299         if (scaler != 1)
1300         {
1301                 for (i = 0;i < m->numverts;i++)
1302                 {
1303                         fcolor[i].c[0] *= scaler;
1304                         fcolor[i].c[1] *= scaler;
1305                         fcolor[i].c[2] *= scaler;
1306                 }
1307         }
1308
1309         if (currenttriangle >= max_batch)
1310                 R_Mesh_Render();
1311 }
1312
1313 /*
1314 void R_Mesh_Draw_GetBuffer(volatile rmeshinfo_t *m)
1315 {
1316         // these are static because gcc runs out of virtual registers otherwise
1317         static int i, j, *index, overbright;
1318         static float *in, scaler;
1319         static buf_transtri_t *tri;
1320
1321         if (!backendactive)
1322                 Sys_Error("R_Mesh_Draw: called when backend is not active\n");
1323
1324         if (!m->numtriangles
1325          || !m->numverts)
1326                 Host_Error("R_Mesh_Draw: no triangles or verts\n");
1327
1328         scaler = 1;
1329         if (m->blendfunc2 == GL_SRC_COLOR)
1330         {
1331                 if (m->blendfunc1 == GL_DST_COLOR) // 2x modulate with framebuffer
1332                         scaler *= 0.5f;
1333         }
1334         else
1335         {
1336                 if (m->tex[0])
1337                 {
1338                         overbright = gl_combine.integer;
1339                         if (overbright)
1340                                 scaler *= 0.25f;
1341                 }
1342                 scaler *= overbrightscale;
1343         }
1344
1345         if (m->transparent)
1346         {
1347                 if (currenttransmesh >= max_meshs || (currenttranstriangle + m->numtriangles) > max_meshs || (currenttransvertex + m->numverts) > max_verts)
1348                 {
1349                         if (!transranout)
1350                         {
1351                                 Con_Printf("R_Mesh_Draw: ran out of room for transparent meshs\n");
1352                                 transranout = true;
1353                         }
1354                         return;
1355                 }
1356
1357                 c_transmeshs++;
1358                 c_transtris += m->numtriangles;
1359                 m->vertex = &buf_transvertex[currenttransvertex].v[0];
1360                 m->color = &buf_transfcolor[currenttransvertex].c[0];
1361                 for (i = 0;i < backendunits;i++)
1362                         m->texcoords[i] = &buf_transtexcoord[i][currenttransvertex].tc[0];
1363
1364                 // transmesh is only for storage of transparent meshs until they
1365                 // are inserted into the main mesh array
1366                 mesh = &buf_transmesh[currenttransmesh++];
1367
1368                 // transparent meshs are broken up into individual triangles which can
1369                 // be sorted by depth
1370                 index = m->index;
1371                 for (i = 0;i < m->numtriangles;i++)
1372                 {
1373                         tri = &buf_transtri[currenttranstriangle++];
1374                         tri->mesh = mesh;
1375                         tri->index[0] = *index++;
1376                         tri->index[1] = *index++;
1377                         tri->index[2] = *index++;
1378                 }
1379
1380                 mesh->firstvert = currenttransvertex;
1381                 mesh->lastvert = currenttransvertex + m->numverts - 1;
1382                 currenttransvertex += m->numverts;
1383         }
1384         else
1385         {
1386                 if (m->numtriangles > max_meshs || m->numverts > max_verts)
1387                 {
1388                         Con_Printf("R_Mesh_Draw_NativeOnly: mesh too big for buffers\n");
1389                         return;
1390                 }
1391
1392                 if (currentmesh >= max_meshs || (currenttriangle + m->numtriangles) > max_batch || (currentvertex + m->numverts) > max_verts)
1393                         R_Mesh_Render();
1394
1395                 c_meshs++;
1396                 c_meshtris += m->numtriangles;
1397                 vert = &buf_vertex[currentvertex];
1398                 fcolor = &buf_fcolor[currentvertex];
1399                 for (i = 0;i < backendunits;i++)
1400                         texcoord[i] = &buf_texcoord[i][currentvertex];
1401
1402                 mesh = &buf_mesh[currentmesh++];
1403                 // opaque meshs are rendered directly
1404                 mesh->firsttriangle = currenttriangle;
1405                 memcpy(&buf_tri[currenttriangle].index[0], m->index, sizeof(float[3]) * m->numtriangles);
1406                 currenttriangle += m->numtriangles;
1407
1408                 mesh->firstvert = currentvertex;
1409                 mesh->lastvert = currentvertex + m->numverts - 1;
1410                 currentvertex += m->numverts;
1411         }
1412
1413         // code shared for transparent and opaque meshs
1414         mesh->blendfunc1 = m->blendfunc1;
1415         mesh->blendfunc2 = m->blendfunc2;
1416         mesh->depthmask = (m->blendfunc2 == GL_ZERO || m->depthwrite);
1417         mesh->depthtest = !m->depthdisable;
1418         mesh->triangles = m->numtriangles;
1419         j = -1;
1420         for (i = 0;i < backendunits;i++)
1421         {
1422                 if ((mesh->textures[i] = m->tex[i]))
1423                         j = i;
1424                 mesh->texturergbscale[i] = m->texrgbscale[i];
1425                 if (mesh->texturergbscale[i] != 1 && mesh->texturergbscale[i] != 2 && mesh->texturergbscale[i] != 4)
1426                         mesh->texturergbscale[i] = 1;
1427         }
1428         if (overbright && j >= 0)
1429                 mesh->texturergbscale[j] = 4;
1430
1431         if (m->vertexstep != sizeof(buf_vertex_t))
1432                 Host_Error("R_Mesh_Draw_NativeOnly: unsupported vertexstep\n");
1433         if (m->colorstep != sizeof(buf_fcolor_t))
1434                 Host_Error("R_Mesh_Draw_NativeOnly: unsupported colorstep\n");
1435         if (m->color == NULL)
1436                 Host_Error("R_Mesh_Draw_NativeOnly: must provide color array\n");
1437         for (j = 0;j < MAX_TEXTUREUNITS && m->tex[j];j++)
1438         {
1439                 if (j >= backendunits)
1440                         Sys_Error("R_Mesh_Draw_NativeOnly: texture %i supplied when there are only %i texture units\n", j + 1, backendunits);
1441                 if (m->texcoordstep[j] != sizeof(buf_texcoord_t))
1442                         Host_Error("R_Mesh_Draw_NativeOnly: unsupported texcoordstep\n");
1443         }
1444
1445         memcpy(vert, m->vertex, m->numverts * sizeof(buf_vertex_t));
1446         for (j = 0;j < MAX_TEXTUREUNITS && m->tex[j];j++)
1447                 memcpy(&texcoord[j][0].t[0], m->texcoords[j], m->numverts * sizeof(buf_texcoord_t));
1448         #if 0
1449         for (;j < backendunits;j++)
1450                 memset(&texcoord[j][0].t[0], 0, m->numverts * sizeof(buf_texcoord_t));
1451         #endif
1452
1453         memcpy(fcolor, m->color, m->numverts * sizeof(buf_fcolor_t));
1454
1455         // do this as a second step because memcpy preloaded the cache, which we can't easily do
1456         if (scaler != 1)
1457         {
1458                 for (i = 0;i < m->numverts;i++)
1459                 {
1460                         fcolor[i].c[0] *= scaler;
1461                         fcolor[i].c[1] *= scaler;
1462                         fcolor[i].c[2] *= scaler;
1463                 }
1464         }
1465
1466         if (currenttriangle >= max_batch)
1467                 R_Mesh_Render();
1468 }
1469 */
1470
1471 void R_Mesh_DrawPolygon(rmeshinfo_t *m, int numverts)
1472 {
1473         m->index = polyindexarray;
1474         m->numverts = numverts;
1475         m->numtriangles = numverts - 2;
1476         if (m->numtriangles < 1)
1477         {
1478                 Con_Printf("R_Mesh_DrawPolygon: invalid vertex count\n");
1479                 return;
1480         }
1481         if (m->numtriangles >= 256)
1482         {
1483                 Con_Printf("R_Mesh_DrawPolygon: only up to 256 triangles (258 verts) supported\n");
1484                 return;
1485         }
1486         R_Mesh_Draw(m);
1487 }
1488
1489 // LordHavoc: this thing is evil, but necessary because decals account for so much overhead
1490 void R_Mesh_DrawDecal(const rmeshinfo_t *m)
1491 {
1492         // these are static because gcc runs out of virtual registers otherwise
1493         static int i, *index, overbright;
1494         static float scaler;
1495         static float cr, cg, cb, ca;
1496         static buf_mesh_t *mesh;
1497         static buf_vertex_t *vert;
1498         static buf_fcolor_t *fcolor;
1499         static buf_texcoord_t *texcoord;
1500         static buf_transtri_t *tri;
1501
1502         if (!backendactive)
1503                 Sys_Error("R_Mesh_Draw: called when backend is not active\n");
1504
1505         scaler = 1;
1506         if (m->tex[0])
1507         {
1508                 overbright = gl_combine.integer;
1509                 if (overbright)
1510                         scaler *= 0.25f;
1511         }
1512         scaler *= overbrightscale;
1513
1514         if (m->transparent)
1515         {
1516                 if (currenttransmesh >= max_meshs || (currenttranstriangle + 2) > max_meshs || (currenttransvertex + 4) > max_verts)
1517                 {
1518                         if (!transranout)
1519                         {
1520                                 Con_Printf("R_Mesh_Draw: ran out of room for transparent meshs\n");
1521                                 transranout = true;
1522                         }
1523                         return;
1524                 }
1525
1526                 c_transmeshs++;
1527                 c_transtris += 2;
1528                 vert = &buf_transvertex[currenttransvertex];
1529                 fcolor = &buf_transfcolor[currenttransvertex];
1530                 texcoord = &buf_transtexcoord[0][currenttransvertex];
1531
1532                 // transmesh is only for storage of transparent meshs until they
1533                 // are inserted into the main mesh array
1534                 mesh = &buf_transmesh[currenttransmesh++];
1535                 mesh->blendfunc1 = m->blendfunc1;
1536                 mesh->blendfunc2 = m->blendfunc2;
1537                 mesh->depthmask = false;
1538                 mesh->depthtest = true;
1539                 mesh->triangles = 2;
1540                 mesh->textures[0] = m->tex[0];
1541                 mesh->texturergbscale[0] = overbright ? 4 : 1;
1542                 for (i = 1;i < backendunits;i++)
1543                 {
1544                         mesh->textures[i] = 0;
1545                         mesh->texturergbscale[i] = 1;
1546                 }
1547                 mesh->chain = NULL;
1548
1549                 // transparent meshs are broken up into individual triangles which can
1550                 // be sorted by depth
1551                 index = m->index;
1552                 tri = &buf_transtri[currenttranstriangle++];
1553                 tri->mesh = mesh;
1554                 tri->index[0] = 0;
1555                 tri->index[1] = 1;
1556                 tri->index[2] = 2;
1557                 tri = &buf_transtri[currenttranstriangle++];
1558                 tri->mesh = mesh;
1559                 tri->index[0] = 0;
1560                 tri->index[1] = 2;
1561                 tri->index[2] = 3;
1562
1563                 mesh->firstvert = currenttransvertex;
1564                 mesh->lastvert = currenttransvertex + 3;
1565                 currenttransvertex += 4;
1566         }
1567         else
1568         {
1569                 if (2 > max_meshs || 4 > max_verts)
1570                 {
1571                         Con_Printf("R_Mesh_Draw: mesh too big for buffers\n");
1572                         return;
1573                 }
1574
1575                 if (currentmesh >= max_meshs || (currenttriangle + 2) > max_batch || (currentvertex + 4) > max_verts)
1576                         R_Mesh_Render();
1577
1578                 c_meshs++;
1579                 c_meshtris += 2;
1580                 vert = &buf_vertex[currentvertex];
1581                 fcolor = &buf_fcolor[currentvertex];
1582                 texcoord = &buf_texcoord[0][currentvertex];
1583
1584                 mesh = &buf_mesh[currentmesh++];
1585                 mesh->blendfunc1 = m->blendfunc1;
1586                 mesh->blendfunc2 = m->blendfunc2;
1587                 mesh->depthmask = false;
1588                 mesh->depthtest = !m->depthdisable;
1589                 mesh->firsttriangle = currenttriangle;
1590                 mesh->triangles = 2;
1591                 mesh->textures[0] = m->tex[0];
1592                 mesh->texturergbscale[0] = overbright ? 4 : 1;
1593                 for (i = 1;i < backendunits;i++)
1594                 {
1595                         mesh->textures[i] = 0;
1596                         mesh->texturergbscale[i] = 1;
1597                 }
1598
1599                 // opaque meshs are rendered directly
1600                 index = &buf_tri[currenttriangle].index[0];
1601                 index[0] = 0;
1602                 index[1] = 1;
1603                 index[2] = 2;
1604                 index[3] = 0;
1605                 index[4] = 2;
1606                 index[5] = 3;
1607                 mesh->firstvert = currentvertex;
1608                 mesh->lastvert = currentvertex + 3;
1609                 currenttriangle += 2;
1610                 currentvertex += 4;
1611         }
1612
1613         // buf_vertex_t must match the size of the decal vertex array (or vice versa)
1614         memcpy(vert, m->vertex, 4 * sizeof(buf_vertex_t));
1615
1616         cr = m->cr * scaler;
1617         cg = m->cg * scaler;
1618         cb = m->cb * scaler;
1619         ca = m->ca;
1620         fcolor[0].c[0] = cr;
1621         fcolor[0].c[1] = cg;
1622         fcolor[0].c[2] = cb;
1623         fcolor[0].c[3] = ca;
1624         fcolor[1].c[0] = cr;
1625         fcolor[1].c[1] = cg;
1626         fcolor[1].c[2] = cb;
1627         fcolor[1].c[3] = ca;
1628         fcolor[2].c[0] = cr;
1629         fcolor[2].c[1] = cg;
1630         fcolor[2].c[2] = cb;
1631         fcolor[2].c[3] = ca;
1632         fcolor[3].c[0] = cr;
1633         fcolor[3].c[1] = cg;
1634         fcolor[3].c[2] = cb;
1635         fcolor[3].c[3] = ca;
1636
1637         // buf_texcoord_t must be the same size as the decal texcoord array (or vice versa)
1638         memcpy(&texcoord[0].t[0], m->texcoords[0], 4 * sizeof(buf_texcoord_t));
1639
1640         if (currenttriangle >= max_batch)
1641                 R_Mesh_Render();
1642 }
1643
1644 /*
1645 ==============================================================================
1646
1647                                                 SCREEN SHOTS
1648
1649 ==============================================================================
1650 */
1651
1652 float CalcFov (float fov_x, float width, float height);
1653 void R_ClearScreen(void);
1654
1655 void SCR_ScreenShot(char *filename, int x, int y, int width, int height)
1656 {
1657         int i;
1658         byte *buffer;
1659
1660         buffer = Mem_Alloc(tempmempool, width*height*3);
1661         glReadPixels (x, y, width, height, GL_RGB, GL_UNSIGNED_BYTE, buffer);
1662         CHECKGLERROR
1663
1664         // LordHavoc: compensate for v_overbrightbits when using hardware gamma
1665         if (v_hwgamma.integer)
1666                 for (i = 0;i < width * height * 3;i++)
1667                         buffer[i] <<= v_overbrightbits.integer;
1668
1669         Image_WriteTGARGB_preflipped(filename, width, height, buffer);
1670
1671         Mem_Free(buffer);
1672 }
1673
1674 /*
1675 ==================
1676 SCR_ScreenShot_f
1677 ==================
1678 */
1679 void SCR_ScreenShot_f (void)
1680 {
1681         int i;
1682         char filename[16];
1683         char checkname[MAX_OSPATH];
1684 //
1685 // find a file name to save it to
1686 //
1687         strcpy(filename, "dp0000.tga");
1688
1689         for (i=0 ; i<=9999 ; i++)
1690         {
1691                 filename[2] = (i/1000)%10 + '0';
1692                 filename[3] = (i/ 100)%10 + '0';
1693                 filename[4] = (i/  10)%10 + '0';
1694                 filename[5] = (i/   1)%10 + '0';
1695                 sprintf (checkname, "%s/%s", com_gamedir, filename);
1696                 if (Sys_FileTime(checkname) == -1)
1697                         break;  // file doesn't exist
1698         }
1699         if (i==10000)
1700         {
1701                 Con_Printf ("SCR_ScreenShot_f: Couldn't create a TGA file\n");
1702                 return;
1703         }
1704
1705         SCR_ScreenShot(filename, vid.realx, vid.realy, vid.realwidth, vid.realheight);
1706         Con_Printf ("Wrote %s\n", filename);
1707 }
1708
1709 /*
1710 ===============
1711 R_Envmap_f
1712
1713 Grab six views for environment mapping tests
1714 ===============
1715 */
1716 struct
1717 {
1718         float angles[3];
1719         char *name;
1720 }
1721 envmapinfo[6] =
1722 {
1723         {{  0,   0, 0}, "ft"},
1724         {{  0,  90, 0}, "rt"},
1725         {{  0, 180, 0}, "bk"},
1726         {{  0, 270, 0}, "lf"},
1727         {{-90,  90, 0}, "up"},
1728         {{ 90,  90, 0}, "dn"}
1729 };
1730 static void R_Envmap_f (void)
1731 {
1732         int j, size;
1733         char filename[256], basename[256];
1734
1735         if (Cmd_Argc() != 3)
1736         {
1737                 Con_Printf ("envmap <basename> <size>: save out 6 cubic environment map images, usable with loadsky, note that size must one of 128, 256, 512, or 1024 and can't be bigger than your current resolution\n");
1738                 return;
1739         }
1740
1741         if (!r_render.integer)
1742                 return;
1743
1744         strcpy(basename, Cmd_Argv(1));
1745         size = atoi(Cmd_Argv(2));
1746         if (size != 128 && size != 256 && size != 512 && size != 1024)
1747         {
1748                 Con_Printf("envmap: size must be one of 128, 256, 512, or 1024\n");
1749                 return;
1750         }
1751         if (size > vid.realwidth || size > vid.realheight)
1752         {
1753                 Con_Printf("envmap: your resolution is not big enough to render that size\n");
1754                 return;
1755         }
1756
1757         envmap = true;
1758
1759         r_refdef.x = 0;
1760         r_refdef.y = 0;
1761         r_refdef.width = size;
1762         r_refdef.height = size;
1763
1764         r_refdef.fov_x = 90;
1765         r_refdef.fov_y = 90;
1766
1767         for (j = 0;j < 6;j++)
1768         {
1769                 sprintf(filename, "env/%s%s.tga", basename, envmapinfo[j].name);
1770                 VectorCopy(envmapinfo[j].angles, r_refdef.viewangles);
1771                 R_ClearScreen();
1772                 R_RenderView ();
1773                 SCR_ScreenShot(filename, vid.realx, vid.realy, size, size);
1774         }
1775
1776         envmap = false;
1777 }
1778
1779 //=============================================================================
1780
1781 void R_ClearScreen(void)
1782 {
1783         if (r_render.integer)
1784         {
1785                 glClearColor(0,0,0,0);
1786                 CHECKGLERROR
1787                 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // LordHavoc: clear the screen (around the view as well)
1788                 CHECKGLERROR
1789                 if (gl_dither.integer)
1790                         glEnable(GL_DITHER);
1791                 else
1792                         glDisable(GL_DITHER);
1793                 CHECKGLERROR
1794         }
1795 }
1796
1797 /*
1798 ==================
1799 SCR_UpdateScreen
1800
1801 This is called every frame, and can also be called explicitly to flush
1802 text to the screen.
1803 ==================
1804 */
1805 void SCR_UpdateScreen (void)
1806 {
1807         //Mem_CheckSentinelsGlobal();
1808         //R_TimeReport("memtest");
1809
1810         glFinish ();
1811         CHECKGLERROR
1812
1813         VID_Finish ();
1814
1815         R_TimeReport("finish");
1816
1817         if (gl_combine.integer && !gl_combine_extension)
1818                 Cvar_SetValue("gl_combine", 0);
1819
1820         lightscalebit = v_overbrightbits.integer;
1821         if (gl_combine.integer && r_multitexture.integer)
1822                 lightscalebit += 2;
1823
1824         lightscale = 1.0f / (float) (1 << lightscalebit);
1825         overbrightscale = 1.0f / (float) (1 << v_overbrightbits.integer);
1826
1827         R_TimeReport("setup");
1828
1829         R_ClearScreen();
1830
1831         R_TimeReport("clear");
1832
1833         if (scr_conlines < vid.conheight)
1834                 R_RenderView();
1835
1836         // draw 2D stuff
1837         R_DrawQueue();
1838 }