gl_backend.c

   1
   2 #include "quakedef.h"
   3
   4 //cvar_t gl_mesh_maxtriangles = {0, "gl_mesh_maxtriangles", "21760"};
   5 cvar_t gl_mesh_maxtriangles = {0, "gl_mesh_maxtriangles", "1024"};
   6 //cvar_t gl_mesh_batchtriangles = {0, "gl_mesh_batchtriangles", "1024"};
   7 cvar_t gl_mesh_batchtriangles = {0, "gl_mesh_batchtriangles", "0"};
   8 cvar_t gl_mesh_transtriangles = {0, "gl_mesh_transtriangles", "16384"};
   9 cvar_t gl_mesh_floatcolors = {0, "gl_mesh_floatcolors", "0"};
  10 cvar_t gl_mesh_drawmode = {CVAR_SAVE, "gl_mesh_drawmode", "3"};
  11
  12 cvar_t r_render = {0, "r_render", "1"};
  13 cvar_t gl_dither = {CVAR_SAVE, "gl_dither", "1"}; // whether or not to use dithering
  14 cvar_t gl_lockarrays = {0, "gl_lockarrays", "1"};
  15
  16 int gl_maxdrawrangeelementsvertices;
  17 int gl_maxdrawrangeelementsindices;
  18
  19 #ifdef DEBUGGL
  20 int errornumber = 0;
  21
  22 void GL_PrintError(int errornumber, char *filename, int linenumber)
  23 {
  24         switch(errornumber)
  25         {
  26 #ifdef GL_INVALID_ENUM
  27         case GL_INVALID_ENUM:
  28                 Con_Printf("GL_INVALID_ENUM at %s:%i\n", filename, linenumber);
  29                 break;
  30 #endif
  31 #ifdef GL_INVALID_VALUE
  32         case GL_INVALID_VALUE:
  33                 Con_Printf("GL_INVALID_VALUE at %s:%i\n", filename, linenumber);
  34                 break;
  35 #endif
  36 #ifdef GL_INVALID_OPERATION
  37         case GL_INVALID_OPERATION:
  38                 Con_Printf("GL_INVALID_OPERATION at %s:%i\n", filename, linenumber);
  39                 break;
  40 #endif
  41 #ifdef GL_STACK_OVERFLOW
  42         case GL_STACK_OVERFLOW:
  43                 Con_Printf("GL_STACK_OVERFLOW at %s:%i\n", filename, linenumber);
  44                 break;
  45 #endif
  46 #ifdef GL_STACK_UNDERFLOW
  47         case GL_STACK_UNDERFLOW:
  48                 Con_Printf("GL_STACK_UNDERFLOW at %s:%i\n", filename, linenumber);
  49                 break;
  50 #endif
  51 #ifdef GL_OUT_OF_MEMORY
  52         case GL_OUT_OF_MEMORY:
  53                 Con_Printf("GL_OUT_OF_MEMORY at %s:%i\n", filename, linenumber);
  54                 break;
  55 #endif
  56 #ifdef GL_TABLE_TOO_LARGE
  57     case GL_TABLE_TOO_LARGE:
  58                 Con_Printf("GL_TABLE_TOO_LARGE at %s:%i\n", filename, linenumber);
  59                 break;
  60 #endif
  61         default:
  62                 Con_Printf("GL UNKNOWN (%i) at %s:%i\n", errornumber, filename, linenumber);
  63                 break;
  64         }
  65 }
  66 #endif
  67
  68 float r_farclip, r_newfarclip;
  69
  70 int polyindexarray[768];
  71
  72 static float viewdist;
  73
  74 int c_meshs, c_meshtris, c_transmeshs, c_transtris;
  75
  76 int                     lightscalebit;
  77 float           lightscale;
  78 float           overbrightscale;
  79
  80 void SCR_ScreenShot_f (void);
  81
  82 static int max_meshs;
  83 static int max_transmeshs;
  84 static int max_batch;
  85 static int max_verts; // always max_meshs * 3
  86 static int max_transverts; // always max_transmeshs * 3
  87 #define TRANSDEPTHRES 4096
  88
  89 typedef struct buf_mesh_s
  90 {
  91         int depthmask;
  92         int depthtest;
  93         int blendfunc1, blendfunc2;
  94         int textures[MAX_TEXTUREUNITS];
  95         int texturergbscale[MAX_TEXTUREUNITS];
  96         int firsttriangle;
  97         int triangles;
  98         int firstvert;
  99         int verts;
 100         struct buf_mesh_s *chain;
 101         struct buf_transtri_s *transchain;
 102 }
 103 buf_mesh_t;
 104
 105 typedef struct buf_transtri_s
 106 {
 107         struct buf_transtri_s *next;
 108         struct buf_transtri_s *meshsortchain;
 109         buf_mesh_t *mesh;
 110         int index[3];
 111 }
 112 buf_transtri_t;
 113
 114 typedef struct buf_tri_s
 115 {
 116         int index[3];
 117 }
 118 buf_tri_t;
 119
 120 typedef struct
 121 {
 122         float v[4];
 123 }
 124 buf_vertex_t;
 125
 126 typedef struct
 127 {
 128         float c[4];
 129 }
 130 buf_fcolor_t;
 131
 132 typedef struct
 133 {
 134         qbyte c[4];
 135 }
 136 buf_bcolor_t;
 137
 138 typedef struct
 139 {
 140         float t[2];
 141 }
 142 buf_texcoord_t;
 143
 144 static float meshfarclip;
 145 static int currentmesh, currenttriangle, currentvertex, backendunits, backendactive, transranout;
 146 static buf_mesh_t *buf_mesh;
 147 static buf_tri_t *buf_tri;
 148 static buf_vertex_t *buf_vertex;
 149 static buf_fcolor_t *buf_fcolor;
 150 static buf_bcolor_t *buf_bcolor;
 151 static buf_texcoord_t *buf_texcoord[MAX_TEXTUREUNITS];
 152
 153 static int currenttransmesh, currenttransvertex, currenttranstriangle;
 154 static buf_mesh_t *buf_transmesh;
 155 static buf_transtri_t *buf_sorttranstri;
 156 static buf_transtri_t **buf_sorttranstri_list;
 157 static buf_tri_t *buf_transtri;
 158 static buf_vertex_t *buf_transvertex;
 159 static buf_fcolor_t *buf_transfcolor;
 160 static buf_texcoord_t *buf_transtexcoord[MAX_TEXTUREUNITS];
 161
 162 static mempool_t *gl_backend_mempool;
 163 static int resizingbuffers = false;
 164
 165 static void gl_backend_start(void)
 166 {
 167         int i;
 168
 169         max_verts = max_meshs * 3;
 170         max_transverts = max_transmeshs * 3;
 171
 172         if (!gl_backend_mempool)
 173                 gl_backend_mempool = Mem_AllocPool("GL_Backend");
 174
 175 #define BACKENDALLOC(var, count, sizeofstruct, varname)\
 176         {\
 177                 var = Mem_Alloc(gl_backend_mempool, count * sizeof(sizeofstruct));\
 178                 if (var == NULL)\
 179                         Sys_Error("gl_backend_start: unable to allocate memory for %s (%d bytes)\n", (varname), count * sizeof(sizeofstruct));\
 180                 memset(var, 0, count * sizeof(sizeofstruct));\
 181         }
 182
 183         BACKENDALLOC(buf_mesh, max_meshs, buf_mesh_t, "buf_mesh")
 184         BACKENDALLOC(buf_tri, max_meshs, buf_tri_t, "buf_tri")
 185         BACKENDALLOC(buf_vertex, max_verts, buf_vertex_t, "buf_vertex")
 186         BACKENDALLOC(buf_fcolor, max_verts, buf_fcolor_t, "buf_fcolor")
 187         BACKENDALLOC(buf_bcolor, max_verts, buf_bcolor_t, "buf_bcolor")
 188
 189         BACKENDALLOC(buf_transmesh, max_transmeshs, buf_mesh_t, "buf_transmesh")
 190         BACKENDALLOC(buf_sorttranstri, max_transmeshs, buf_transtri_t, "buf_sorttranstri")
 191         BACKENDALLOC(buf_sorttranstri_list, TRANSDEPTHRES, buf_transtri_t *, "buf_sorttranstri_list")
 192         BACKENDALLOC(buf_transtri, max_transmeshs, buf_tri_t, "buf_transtri")
 193         BACKENDALLOC(buf_transvertex, max_transverts, buf_vertex_t, "buf_vertex")
 194         BACKENDALLOC(buf_transfcolor, max_transverts, buf_fcolor_t, "buf_fcolor")
 195
 196         for (i = 0;i < MAX_TEXTUREUNITS;i++)
 197         {
 198                 // only allocate as many texcoord arrays as we need
 199                 if (i < gl_textureunits)
 200                 {
 201                         BACKENDALLOC(buf_texcoord[i], max_verts, buf_texcoord_t, va("buf_texcoord[%d]", i))
 202                         BACKENDALLOC(buf_transtexcoord[i], max_transverts, buf_texcoord_t, va("buf_transtexcoord[%d]", i))
 203                 }
 204                 else
 205                 {
 206                         buf_texcoord[i] = NULL;
 207                         buf_transtexcoord[i] = NULL;
 208                 }
 209         }
 210         backendunits = min(MAX_TEXTUREUNITS, gl_textureunits);
 211         backendactive = true;
 212 }
 213
 214 static void gl_backend_shutdown(void)
 215 {
 216         if (resizingbuffers)
 217                 Mem_EmptyPool(gl_backend_mempool);
 218         else
 219                 Mem_FreePool(&gl_backend_mempool);
 220
 221         backendunits = 0;
 222         backendactive = false;
 223 }
 224
 225 static void gl_backend_bufferchanges(int init)
 226 {
 227         if (gl_mesh_drawmode.integer == 3 && qglDrawRangeElements != NULL)
 228         {
 229                 if (gl_mesh_maxtriangles.integer * 3 > gl_maxdrawrangeelementsindices)
 230                         Cvar_SetValueQuick(&gl_mesh_maxtriangles, (int) (gl_maxdrawrangeelementsindices / 3));
 231                 if (gl_mesh_maxtriangles.integer * 3 > gl_maxdrawrangeelementsvertices)
 232                         Cvar_SetValueQuick(&gl_mesh_maxtriangles, (int) (gl_maxdrawrangeelementsvertices / 3));
 233         }
 234
 235         // 21760 is (65536 / 3) rounded off to a multiple of 128
 236         if (gl_mesh_maxtriangles.integer < 1024)
 237                 Cvar_SetValueQuick(&gl_mesh_maxtriangles, 1024);
 238         if (gl_mesh_maxtriangles.integer > 21760)
 239                 Cvar_SetValueQuick(&gl_mesh_maxtriangles, 21760);
 240
 241         if (gl_mesh_transtriangles.integer < 1024)
 242                 Cvar_SetValueQuick(&gl_mesh_transtriangles, 1024);
 243         if (gl_mesh_transtriangles.integer > 65536)
 244                 Cvar_SetValueQuick(&gl_mesh_transtriangles, 65536);
 245
 246         if (gl_mesh_batchtriangles.integer < 0)
 247                 Cvar_SetValueQuick(&gl_mesh_batchtriangles, 0);
 248         if (gl_mesh_batchtriangles.integer > gl_mesh_maxtriangles.integer)
 249                 Cvar_SetValueQuick(&gl_mesh_batchtriangles, gl_mesh_maxtriangles.integer);
 250
 251         max_batch = gl_mesh_batchtriangles.integer;
 252
 253         if (max_meshs != gl_mesh_maxtriangles.integer || max_transmeshs != gl_mesh_transtriangles.integer)
 254         {
 255                 max_meshs = gl_mesh_maxtriangles.integer;
 256                 max_transmeshs = gl_mesh_transtriangles.integer;
 257
 258                 if (!init)
 259                 {
 260                         resizingbuffers = true;
 261                         gl_backend_shutdown();
 262                         gl_backend_start();
 263                         resizingbuffers = false;
 264                 }
 265         }
 266 }
 267
 268 static void gl_backend_newmap(void)
 269 {
 270         r_farclip = r_newfarclip = 2048.0f;
 271 }
 272
 273 void gl_backend_init(void)
 274 {
 275         int i;
 276
 277         Cvar_RegisterVariable(&r_render);
 278         Cvar_RegisterVariable(&gl_dither);
 279         Cvar_RegisterVariable(&gl_lockarrays);
 280 #ifdef NORENDER
 281         Cvar_SetValue("r_render", 0);
 282 #endif
 283
 284         Cvar_RegisterVariable(&gl_mesh_maxtriangles);
 285         Cvar_RegisterVariable(&gl_mesh_transtriangles);
 286         Cvar_RegisterVariable(&gl_mesh_batchtriangles);
 287         Cvar_RegisterVariable(&gl_mesh_floatcolors);
 288         Cvar_RegisterVariable(&gl_mesh_drawmode);
 289         R_RegisterModule("GL_Backend", gl_backend_start, gl_backend_shutdown, gl_backend_newmap);
 290         gl_backend_bufferchanges(true);
 291         for (i = 0;i < 256;i++)
 292         {
 293                 polyindexarray[i*3+0] = 0;
 294                 polyindexarray[i*3+1] = i + 1;
 295                 polyindexarray[i*3+2] = i + 2;
 296         }
 297 }
 298
 299 int arraylocked = false;
 300
 301 void GL_LockArray(int first, int count)
 302 {
 303         if (!arraylocked && gl_supportslockarrays && gl_lockarrays.integer && gl_mesh_drawmode.integer != 0)
 304         {
 305                 qglLockArraysEXT(first, count);
 306                 CHECKGLERROR
 307                 arraylocked = true;
 308         }
 309 }
 310
 311 void GL_UnlockArray(void)
 312 {
 313         if (arraylocked)
 314         {
 315                 qglUnlockArraysEXT();
 316                 CHECKGLERROR
 317                 arraylocked = false;
 318         }
 319 }
 320
 321 //static float gldepthmin, gldepthmax;
 322
 323 /*
 324 =============
 325 GL_SetupFrame
 326 =============
 327 */
 328 static void GL_SetupFrame (void)
 329 {
 330         double xmax, ymax;
 331         double fovx, fovy, zNear, zFar, aspect;
 332
 333         // update farclip based on previous frame
 334         r_farclip = r_newfarclip;
 335
 336         if (!r_render.integer)
 337                 return;
 338
 339 //      qglClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // LordHavoc: moved to SCR_UpdateScreen
 340 //      gldepthmin = 0;
 341 //      gldepthmax = 1;
 342         qglDepthFunc (GL_LEQUAL);CHECKGLERROR
 343
 344 //      qglDepthRange (gldepthmin, gldepthmax);CHECKGLERROR
 345
 346         // set up viewpoint
 347         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 348         qglLoadIdentity ();CHECKGLERROR
 349
 350         // y is weird beause OpenGL is bottom to top, we use top to bottom
 351         qglViewport(r_refdef.x, vid.realheight - (r_refdef.y + r_refdef.height), r_refdef.width, r_refdef.height);CHECKGLERROR
 352
 353         // depth range
 354         zNear = 1.0;
 355         zFar = r_farclip;
 356
 357         // fov angles
 358         fovx = r_refdef.fov_x;
 359         fovy = r_refdef.fov_y;
 360         aspect = r_refdef.width / r_refdef.height;
 361
 362         // pyramid slopes
 363         xmax = zNear * tan(fovx * M_PI / 360.0) * aspect;
 364         ymax = zNear * tan(fovy * M_PI / 360.0);
 365
 366         // set view pyramid
 367         qglFrustum(-xmax, xmax, -ymax, ymax, zNear, zFar);CHECKGLERROR
 368
 369 //      qglCullFace(GL_FRONT);CHECKGLERROR
 370
 371         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 372         qglLoadIdentity ();CHECKGLERROR
 373
 374         // put Z going up
 375         qglRotatef (-90,  1, 0, 0);CHECKGLERROR
 376         qglRotatef (90,  0, 0, 1);CHECKGLERROR
 377         // camera rotation
 378         qglRotatef (-r_refdef.viewangles[2],  1, 0, 0);CHECKGLERROR
 379         qglRotatef (-r_refdef.viewangles[0],  0, 1, 0);CHECKGLERROR
 380         qglRotatef (-r_refdef.viewangles[1],  0, 0, 1);CHECKGLERROR
 381         // camera location
 382         qglTranslatef (-r_refdef.vieworg[0],  -r_refdef.vieworg[1],  -r_refdef.vieworg[2]);CHECKGLERROR
 383
 384 //      qglGetFloatv (GL_MODELVIEW_MATRIX, r_world_matrix);
 385
 386         //
 387         // set drawing parms
 388         //
 389 //      if (gl_cull.integer)
 390 //      {
 391 //              qglEnable(GL_CULL_FACE);CHECKGLERROR
 392 //      }
 393 //      else
 394 //      {
 395 //              qglDisable(GL_CULL_FACE);CHECKGLERROR
 396 //      }
 397
 398 //      qglEnable(GL_BLEND);CHECKGLERROR
 399 //      qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 400 //      qglDepthMask(1);CHECKGLERROR
 401 }
 402
 403 static int mesh_blendfunc1;
 404 static int mesh_blendfunc2;
 405 static int mesh_blend;
 406 static GLboolean mesh_depthmask;
 407 static int mesh_depthtest;
 408 static int mesh_unit;
 409 static int mesh_clientunit;
 410 static int mesh_texture[MAX_TEXTUREUNITS];
 411 static float mesh_texturergbscale[MAX_TEXTUREUNITS];
 412
 413 void GL_SetupTextureState(void)
 414 {
 415         int i;
 416         if (backendunits > 1)
 417         {
 418                 for (i = 0;i < backendunits;i++)
 419                 {
 420                         qglActiveTexture(GL_TEXTURE0_ARB + (mesh_unit = i));CHECKGLERROR
 421                         qglBindTexture(GL_TEXTURE_2D, mesh_texture[i]);CHECKGLERROR
 422                         if (gl_combine.integer)
 423                         {
 424                                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);CHECKGLERROR
 425                                 qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_MODULATE);CHECKGLERROR
 426                                 qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE);CHECKGLERROR
 427                                 qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 428                                 qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_RGB_ARB, GL_CONSTANT_ARB);CHECKGLERROR
 429                                 qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 430                                 qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 431                                 qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_RGB_ARB, GL_SRC_ALPHA);CHECKGLERROR
 432                                 qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, GL_MODULATE);CHECKGLERROR
 433                                 qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA_ARB, GL_TEXTURE);CHECKGLERROR
 434                                 qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_ALPHA_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 435                                 qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_ALPHA_ARB, GL_CONSTANT_ARB);CHECKGLERROR
 436                                 qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 437                                 qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 438                                 qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 439                                 qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, mesh_texturergbscale[i]);CHECKGLERROR
 440                                 qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
 441                         }
 442                         else
 443                         {
 444                                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 445                         }
 446                         if (mesh_texture[i])
 447                         {
 448                                 qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 449                         }
 450                         else
 451                         {
 452                                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 453                         }
 454                         if (gl_mesh_drawmode.integer != 0)
 455                         {
 456                                 qglClientActiveTexture(GL_TEXTURE0_ARB + (mesh_clientunit = i));CHECKGLERROR
 457                                 qglTexCoordPointer(2, GL_FLOAT, sizeof(buf_texcoord_t), buf_texcoord[i]);CHECKGLERROR
 458                                 if (mesh_texture[i])
 459                                 {
 460                                         qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 461                                 }
 462                                 else
 463                                 {
 464                                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 465                                 }
 466                         }
 467                 }
 468         }
 469         else
 470         {
 471                 qglBindTexture(GL_TEXTURE_2D, mesh_texture[0]);CHECKGLERROR
 472                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 473                 if (mesh_texture[0])
 474                 {
 475                         qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 476                 }
 477                 else
 478                 {
 479                         qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 480                 }
 481                 if (gl_mesh_drawmode.integer != 0)
 482                 {
 483                         qglTexCoordPointer(2, GL_FLOAT, sizeof(buf_texcoord_t), buf_texcoord[0]);CHECKGLERROR
 484                         if (mesh_texture[0])
 485                         {
 486                                 qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 487                         }
 488                         else
 489                         {
 490                                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 491                         }
 492                 }
 493         }
 494 }
 495
 496 // called at beginning of frame
 497 int usedarrays;
 498 void R_Mesh_Start(void)
 499 {
 500         int i;
 501         if (!backendactive)
 502                 Sys_Error("R_Mesh_Clear: called when backend is not active\n");
 503
 504         CHECKGLERROR
 505
 506         gl_backend_bufferchanges(false);
 507
 508         currentmesh = 0;
 509         currenttriangle = 0;
 510         currentvertex = 0;
 511         currenttransmesh = 0;
 512         currenttranstriangle = 0;
 513         currenttransvertex = 0;
 514         meshfarclip = 0;
 515         transranout = false;
 516         viewdist = DotProduct(r_origin, vpn);
 517
 518         c_meshs = 0;
 519         c_meshtris = 0;
 520         c_transmeshs = 0;
 521         c_transtris = 0;
 522
 523         GL_SetupFrame();
 524
 525         mesh_unit = 0;
 526         mesh_clientunit = 0;
 527
 528         for (i = 0;i < backendunits;i++)
 529         {
 530                 mesh_texture[i] = 0;
 531                 mesh_texturergbscale[i] = 1;
 532         }
 533
 534         qglEnable(GL_CULL_FACE);CHECKGLERROR
 535         qglCullFace(GL_FRONT);CHECKGLERROR
 536
 537         mesh_depthtest = true;
 538         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 539
 540         mesh_blendfunc1 = GL_ONE;
 541         mesh_blendfunc2 = GL_ZERO;
 542         qglBlendFunc(mesh_blendfunc1, mesh_blendfunc2);CHECKGLERROR
 543
 544         mesh_blend = 0;
 545         qglDisable(GL_BLEND);CHECKGLERROR
 546
 547         mesh_depthmask = GL_TRUE;
 548         qglDepthMask(mesh_depthmask);CHECKGLERROR
 549
 550         usedarrays = false;
 551         if (gl_mesh_drawmode.integer != 0)
 552         {
 553                 usedarrays = true;
 554                 qglVertexPointer(3, GL_FLOAT, sizeof(buf_vertex_t), &buf_vertex[0].v[0]);CHECKGLERROR
 555                 qglEnableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 556                 if (gl_mesh_floatcolors.integer)
 557                 {
 558                         qglColorPointer(4, GL_FLOAT, sizeof(buf_fcolor_t), &buf_fcolor[0].c[0]);CHECKGLERROR
 559                 }
 560                 else
 561                 {
 562                         qglColorPointer(4, GL_UNSIGNED_BYTE, sizeof(buf_bcolor_t), &buf_bcolor[0].c[0]);CHECKGLERROR
 563                 }
 564                 qglEnableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 565         }
 566
 567         GL_SetupTextureState();
 568 }
 569
 570 int gl_backend_rebindtextures;
 571
 572 void GL_UpdateFarclip(void)
 573 {
 574         int i;
 575         float farclip;
 576
 577         // push out farclip based on vertices
 578         // FIXME: wouldn't this be slow when using matrix transforms?
 579         for (i = 0;i < currentvertex;i++)
 580         {
 581                 farclip = DotProduct(buf_vertex[i].v, vpn);
 582                 if (meshfarclip < farclip)
 583                         meshfarclip = farclip;
 584         }
 585
 586         farclip = meshfarclip + 256.0f - viewdist; // + 256 just to be safe
 587
 588         // push out farclip for next frame
 589         if (farclip > r_newfarclip)
 590                 r_newfarclip = ceil((farclip + 255) / 256) * 256 + 256;
 591 }
 592
 593 void GL_ConvertColorsFloatToByte(void)
 594 {
 595         int i, k, total, *icolor;
 596         float *fcolor;
 597         qbyte *bcolor;
 598
 599         total = currentvertex * 4;
 600
 601         // shift float to have 8bit fraction at base of number
 602         fcolor = &buf_fcolor->c[0];
 603         for (i = 0;i < total;)
 604         {
 605                 fcolor[i    ] += 32768.0f;
 606                 fcolor[i + 1] += 32768.0f;
 607                 fcolor[i + 2] += 32768.0f;
 608                 fcolor[i + 3] += 32768.0f;
 609                 i += 4;
 610         }
 611
 612         // then read as integer and kill float bits...
 613         icolor = (int *)&buf_fcolor->c[0];
 614         bcolor = &buf_bcolor->c[0];
 615         for (i = 0;i < total;)
 616         {
 617                 k = icolor[i    ] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i    ] = (qbyte) k;
 618                 k = icolor[i + 1] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i + 1] = (qbyte) k;
 619                 k = icolor[i + 2] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i + 2] = (qbyte) k;
 620                 k = icolor[i + 3] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i + 3] = (qbyte) k;
 621                 i += 4;
 622         }
 623 }
 624
 625 void GL_MeshState(buf_mesh_t *mesh)
 626 {
 627         int i;
 628         if (backendunits > 1)
 629         {
 630                 for (i = 0;i < backendunits;i++)
 631                 {
 632                         if (mesh_texture[i] != mesh->textures[i])
 633                         {
 634                                 if (mesh_unit != i)
 635                                 {
 636                                         qglActiveTexture(GL_TEXTURE0_ARB + (mesh_unit = i));CHECKGLERROR
 637                                 }
 638                                 if (mesh_texture[i] == 0)
 639                                 {
 640                                         qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 641                                         // have to disable texcoord array on disabled texture
 642                                         // units due to NVIDIA driver bug with
 643                                         // compiled_vertex_array
 644                                         if (mesh_clientunit != i)
 645                                         {
 646                                                 qglClientActiveTexture(GL_TEXTURE0_ARB + (mesh_clientunit = i));CHECKGLERROR
 647                                         }
 648                                         qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 649                                 }
 650                                 qglBindTexture(GL_TEXTURE_2D, (mesh_texture[i] = mesh->textures[i]));CHECKGLERROR
 651                                 if (mesh_texture[i] == 0)
 652                                 {
 653                                         qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 654                                         // have to disable texcoord array on disabled texture
 655                                         // units due to NVIDIA driver bug with
 656                                         // compiled_vertex_array
 657                                         if (mesh_clientunit != i)
 658                                         {
 659                                                 qglClientActiveTexture(GL_TEXTURE0_ARB + (mesh_clientunit = i));CHECKGLERROR
 660                                         }
 661                                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 662                                 }
 663                         }
 664                         if (mesh_texturergbscale[i] != mesh->texturergbscale[i])
 665                         {
 666                                 if (mesh_unit != i)
 667                                 {
 668                                         qglActiveTexture(GL_TEXTURE0_ARB + (mesh_unit = i));CHECKGLERROR
 669                                 }
 670                                 qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, (mesh_texturergbscale[i] = mesh->texturergbscale[i]));CHECKGLERROR
 671                         }
 672                 }
 673         }
 674         else
 675         {
 676                 if (mesh_texture[0] != mesh->textures[0])
 677                 {
 678                         if (mesh_texture[0] == 0)
 679                         {
 680                                 qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 681                                 qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 682                         }
 683                         qglBindTexture(GL_TEXTURE_2D, (mesh_texture[0] = mesh->textures[0]));CHECKGLERROR
 684                         if (mesh_texture[0] == 0)
 685                         {
 686                                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 687                                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 688                         }
 689                 }
 690         }
 691         if (mesh_blendfunc1 != mesh->blendfunc1 || mesh_blendfunc2 != mesh->blendfunc2)
 692         {
 693                 qglBlendFunc(mesh_blendfunc1 = mesh->blendfunc1, mesh_blendfunc2 = mesh->blendfunc2);CHECKGLERROR
 694                 if (mesh_blendfunc2 == GL_ZERO)
 695                 {
 696                         if (mesh_blendfunc1 == GL_ONE)
 697                         {
 698                                 if (mesh_blend)
 699                                 {
 700                                         mesh_blend = 0;
 701                                         qglDisable(GL_BLEND);CHECKGLERROR
 702                                 }
 703                         }
 704                         else
 705                         {
 706                                 if (!mesh_blend)
 707                                 {
 708                                         mesh_blend = 1;
 709                                         qglEnable(GL_BLEND);CHECKGLERROR
 710                                 }
 711                         }
 712                 }
 713                 else
 714                 {
 715                         if (!mesh_blend)
 716                         {
 717                                 mesh_blend = 1;
 718                                 qglEnable(GL_BLEND);CHECKGLERROR
 719                         }
 720                 }
 721         }
 722         if (mesh_depthtest != mesh->depthtest)
 723         {
 724                 mesh_depthtest = mesh->depthtest;
 725                 if (mesh_depthtest)
 726                         qglEnable(GL_DEPTH_TEST);
 727                 else
 728                         qglDisable(GL_DEPTH_TEST);
 729         }
 730         if (mesh_depthmask != mesh->depthmask)
 731         {
 732                 qglDepthMask(mesh_depthmask = mesh->depthmask);CHECKGLERROR
 733         }
 734 }
 735
 736 void GL_DrawRangeElements(int firstvert, int endvert, int indexcount, GLuint *index)
 737 {
 738         unsigned int i, j, in;
 739         if (gl_mesh_drawmode.integer == 3 && qglDrawRangeElements == NULL)
 740                 Cvar_SetValueQuick(&gl_mesh_drawmode, 2);
 741
 742         if (gl_mesh_drawmode.integer == 3)
 743         {
 744                 // GL 1.2 or GL 1.1 with extension
 745                 qglDrawRangeElements(GL_TRIANGLES, firstvert, endvert, indexcount, GL_UNSIGNED_INT, index);
 746         }
 747         else if (gl_mesh_drawmode.integer == 2)
 748         {
 749                 // GL 1.1
 750                 qglDrawElements(GL_TRIANGLES, indexcount, GL_UNSIGNED_INT, index);
 751         }
 752         else if (gl_mesh_drawmode.integer == 1)
 753         {
 754                 // GL 1.1
 755                 // feed it manually using glArrayElement
 756                 qglBegin(GL_TRIANGLES);
 757                 for (i = 0;i < indexcount;i++)
 758                         qglArrayElement(index[i]);
 759                 qglEnd();
 760         }
 761         else
 762         {
 763                 // GL 1.1 but not using vertex arrays - 3dfx glquake minigl driver
 764                 // feed it manually
 765                 if (gl_mesh_drawmode.integer != 0)
 766                         Cvar_SetValueQuick(&gl_mesh_drawmode, 0);
 767                 qglBegin(GL_TRIANGLES);
 768                 if (r_multitexture.integer)
 769                 {
 770                         // the minigl doesn't have this (because it does not have ARB_multitexture)
 771                         for (i = 0;i < indexcount;i++)
 772                         {
 773                                 in = index[i];
 774                                 qglColor4ub(buf_bcolor[in].c[0], buf_bcolor[in].c[1], buf_bcolor[in].c[2], buf_bcolor[in].c[3]);
 775                                 for (j = 0;j < backendunits;j++)
 776                                         if (mesh_texture[j])
 777                                                 qglMultiTexCoord2f(GL_TEXTURE0_ARB + j, buf_texcoord[j][in].t[0], buf_texcoord[j][in].t[1]);
 778                                 qglVertex3f(buf_vertex[in].v[0], buf_vertex[in].v[1], buf_vertex[in].v[2]);
 779                         }
 780                 }
 781                 else
 782                 {
 783                         for (i = 0;i < indexcount;i++)
 784                         {
 785                                 in = index[i];
 786                                 qglColor4ub(buf_bcolor[in].c[0], buf_bcolor[in].c[1], buf_bcolor[in].c[2], buf_bcolor[in].c[3]);
 787                                 if (mesh_texture[0])
 788                                         qglTexCoord2f(buf_texcoord[0][in].t[0], buf_texcoord[0][in].t[1]);
 789                                 qglVertex3f(buf_vertex[in].v[0], buf_vertex[in].v[1], buf_vertex[in].v[2]);
 790                         }
 791                 }
 792                 qglEnd();
 793         }
 794         /*
 795         if (qglDrawRangeElements)
 796                 qglDrawRangeElements(GL_TRIANGLES, firstvert, endvert, indexcount, index);
 797         else
 798         {
 799         }
 800         #ifdef WIN32
 801         // FIXME: dynamic link to GL so we can get DrawRangeElements on WIN32
 802         qglDrawElements(GL_TRIANGLES, indexcount, GL_UNSIGNED_INT, index);CHECKGLERROR
 803         #else
 804         qglDrawRangeElements(GL_TRIANGLES, firstvert, firstvert + mesh->verts, indexcount, GL_UNSIGNED_INT, index);CHECKGLERROR
 805         #endif
 806         */
 807 }
 808
 809 // renders mesh buffers, called to flush buffers when full
 810 void R_Mesh_Render(void)
 811 {
 812         int i;
 813         int k;
 814         int indexcount;
 815         int firstvert;
 816         buf_mesh_t *mesh;
 817         unsigned int *index;
 818
 819         if (!backendactive)
 820                 Sys_Error("R_Mesh_Render: called when backend is not active\n");
 821
 822         if (!currentmesh)
 823                 return;
 824
 825         CHECKGLERROR
 826
 827         GL_UpdateFarclip();
 828
 829         if (!gl_mesh_floatcolors.integer || gl_mesh_drawmode.integer == 0)
 830                 GL_ConvertColorsFloatToByte();
 831
 832         // lock the arrays now that they will have no further modifications
 833         //GL_LockArray(0, currentvertex);CHECKGLERROR
 834         if (gl_backend_rebindtextures)
 835         {
 836                 gl_backend_rebindtextures = false;
 837                 GL_SetupTextureState();
 838         }
 839
 840         GL_MeshState(buf_mesh);
 841         GL_LockArray(0, currentvertex);
 842         GL_DrawRangeElements(buf_mesh->firstvert, buf_mesh->firstvert + buf_mesh->verts, buf_mesh->triangles * 3, (unsigned int *)&buf_tri[buf_mesh->firsttriangle].index[0]);CHECKGLERROR
 843
 844         if (currentmesh >= 2)
 845         {
 846                 for (k = 1, mesh = buf_mesh + k;k < currentmesh;k++, mesh++)
 847                 {
 848                         GL_MeshState(mesh);
 849
 850                         firstvert = mesh->firstvert;
 851                         indexcount = mesh->triangles * 3;
 852                         index = (unsigned int *)&buf_tri[mesh->firsttriangle].index[0];
 853
 854                         // if not using batching, skip the index adjustment
 855                         if (firstvert != 0)
 856                                 for (i = 0;i < indexcount;i++)
 857                                         index[i] += firstvert;
 858
 859                         GL_DrawRangeElements(firstvert, firstvert + mesh->verts, indexcount, index);CHECKGLERROR
 860                 }
 861         }
 862
 863         currentmesh = 0;
 864         currenttriangle = 0;
 865         currentvertex = 0;
 866
 867         GL_UnlockArray();CHECKGLERROR
 868 }
 869
 870 // restores backend state, used when done with 3D rendering
 871 void R_Mesh_Finish(void)
 872 {
 873         int i;
 874         // flush any queued meshs
 875         R_Mesh_Render();
 876
 877         if (backendunits > 1)
 878         {
 879                 for (i = backendunits - 1;i >= 0;i--)
 880                 {
 881                         qglActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
 882                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 883                         if (gl_combine.integer)
 884                         {
 885                                 qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
 886                         }
 887                         if (i > 0)
 888                         {
 889                                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 890                         }
 891                         else
 892                         {
 893                                 qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 894                         }
 895                         qglBindTexture(GL_TEXTURE_2D, 0);CHECKGLERROR
 896
 897                         if (usedarrays)
 898                         {
 899                                 qglClientActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
 900                                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 901                         }
 902                 }
 903         }
 904         else
 905         {
 906                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 907                 qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 908                 if (usedarrays)
 909                 {
 910                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 911                 }
 912         }
 913         if (usedarrays)
 914         {
 915                 qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 916                 qglDisableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 917         }
 918
 919         qglDisable(GL_BLEND);CHECKGLERROR
 920         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 921         qglDepthMask(GL_TRUE);CHECKGLERROR
 922         qglBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);CHECKGLERROR
 923 }
 924
 925 void R_Mesh_ClearDepth(void)
 926 {
 927         R_Mesh_AddTransparent();
 928         R_Mesh_Finish();
 929         qglClear(GL_DEPTH_BUFFER_BIT);
 930         R_Mesh_Start();
 931 }
 932
 933 void R_Mesh_AddTransparent(void)
 934 {
 935         int i, j, k, *index;
 936         float viewdistcompare, centerscaler, dist1, dist2, dist3, center, maxdist;
 937         buf_vertex_t *vert1, *vert2, *vert3;
 938         buf_transtri_t *tri;
 939         buf_mesh_t *mesh, *transmesh;
 940
 941         if (!currenttransmesh)
 942                 return;
 943
 944         // convert index data to transtris for sorting
 945         for (j = 0;j < currenttransmesh;j++)
 946         {
 947                 mesh = buf_transmesh + j;
 948                 k = mesh->firsttriangle;
 949                 index = &buf_transtri[k].index[0];
 950                 for (i = 0;i < mesh->triangles;i++)
 951                 {
 952                         tri = &buf_sorttranstri[k++];
 953                         tri->mesh = mesh;
 954                         tri->index[0] = *index++;
 955                         tri->index[1] = *index++;
 956                         tri->index[2] = *index++;
 957                 }
 958         }
 959
 960         // map farclip to 0-4095 list range
 961         centerscaler = (TRANSDEPTHRES / r_farclip) * (1.0f / 3.0f);
 962         viewdistcompare = viewdist + 4.0f;
 963
 964         memset(buf_sorttranstri_list, 0, TRANSDEPTHRES * sizeof(buf_transtri_t *));
 965
 966         k = 0;
 967         for (j = 0;j < currenttranstriangle;j++)
 968         {
 969                 tri = &buf_sorttranstri[j];
 970                 i = tri->mesh->firstvert;
 971
 972                 vert1 = &buf_transvertex[tri->index[0] + i];
 973                 vert2 = &buf_transvertex[tri->index[1] + i];
 974                 vert3 = &buf_transvertex[tri->index[2] + i];
 975
 976                 dist1 = DotProduct(vert1->v, vpn);
 977                 dist2 = DotProduct(vert2->v, vpn);
 978                 dist3 = DotProduct(vert3->v, vpn);
 979
 980                 maxdist = max(dist1, max(dist2, dist3));
 981                 if (maxdist < viewdistcompare)
 982                         continue;
 983
 984                 center = (dist1 + dist2 + dist3) * centerscaler - viewdist;
 985 #if SLOWMATH
 986                 i = (int) center;
 987                 i = bound(0, i, (TRANSDEPTHRES - 1));
 988 #else
 989                 if (center < 0.0f)
 990                         center = 0.0f;
 991                 center += 8388608.0f;
 992                 i = *((int *)&center) & 0x7FFFFF;
 993                 i = min(i, (TRANSDEPTHRES - 1));
 994 #endif
 995                 tri->next = buf_sorttranstri_list[i];
 996                 buf_sorttranstri_list[i] = tri;
 997                 k++;
 998         }
 999
1000         for (i = 0;i < currenttransmesh;i++)
1001                 buf_transmesh[i].transchain = NULL;
1002         transmesh = NULL;
1003         for (j = 0;j < TRANSDEPTHRES;j++)
1004         {
1005                 if ((tri = buf_sorttranstri_list[j]))
1006                 {
1007                         for (;tri;tri = tri->next)
1008                         {
1009                                 if (!tri->mesh->transchain)
1010                                 {
1011                                         tri->mesh->chain = transmesh;
1012                                         transmesh = tri->mesh;
1013                                 }
1014                                 tri->meshsortchain = tri->mesh->transchain;
1015                                 tri->mesh->transchain = tri;
1016                         }
1017                 }
1018         }
1019
1020         for (;transmesh;transmesh = transmesh->chain)
1021         {
1022                 if (currentmesh >= max_meshs || currenttriangle + transmesh->triangles > max_batch || currenttriangle + transmesh->triangles > 1024 || currentvertex + transmesh->verts > max_verts)
1023                         R_Mesh_Render();
1024
1025                 mesh = &buf_mesh[currentmesh++];
1026                 *mesh = *transmesh; // copy mesh properties
1027
1028                 mesh->firstvert = currentvertex;
1029                 memcpy(&buf_vertex[currentvertex], &buf_transvertex[transmesh->firstvert], transmesh->verts * sizeof(buf_vertex_t));
1030                 memcpy(&buf_fcolor[currentvertex], &buf_transfcolor[transmesh->firstvert], transmesh->verts * sizeof(buf_fcolor_t));
1031                 for (i = 0;i < backendunits && transmesh->textures[i];i++)
1032                         memcpy(&buf_texcoord[i][currentvertex], &buf_transtexcoord[i][transmesh->firstvert], transmesh->verts * sizeof(buf_texcoord_t));
1033                 currentvertex += mesh->verts;
1034
1035                 mesh->firsttriangle = currenttriangle;
1036                 for (tri = transmesh->transchain;tri;tri = tri->meshsortchain)
1037                 {
1038                         buf_tri[currenttriangle].index[0] = tri->index[0];
1039                         buf_tri[currenttriangle].index[1] = tri->index[1];
1040                         buf_tri[currenttriangle].index[2] = tri->index[2];
1041                         currenttriangle++;
1042                 }
1043                 mesh->triangles = currenttriangle - mesh->firsttriangle;
1044         }
1045
1046         currenttransmesh = 0;
1047         currenttranstriangle = 0;
1048         currenttransvertex = 0;
1049 }
1050
1051 void R_Mesh_Draw(const rmeshinfo_t *m)
1052 {
1053         // these are static because gcc runs out of virtual registers otherwise
1054         static int i, j, overbright, *index;
1055         static float *in, scaler;
1056         static float cr, cg, cb, ca;
1057         static buf_mesh_t *mesh;
1058         static buf_vertex_t *vert;
1059         static buf_fcolor_t *fcolor;
1060         static buf_texcoord_t *texcoord[MAX_TEXTUREUNITS];
1061
1062         if (!backendactive)
1063                 Sys_Error("R_Mesh_Draw: called when backend is not active\n");
1064
1065         if (m->index == NULL
1066          || !m->numtriangles
1067          || m->vertex == NULL
1068          || !m->numverts)
1069                 Host_Error("R_Mesh_Draw: no triangles or verts\n");
1070
1071         // ignore meaningless alpha meshs
1072         if (!m->depthwrite && m->blendfunc1 == GL_SRC_ALPHA && (m->blendfunc2 == GL_ONE || m->blendfunc2 == GL_ONE_MINUS_SRC_ALPHA))
1073         {
1074                 if (m->color)
1075                 {
1076                         for (i = 0, in = m->color + 3;i < m->numverts;i++, (int)in += m->colorstep)
1077                                 if (*in >= 0.01f)
1078                                         break;
1079                         if (i == m->numverts)
1080                                 return;
1081                 }
1082                 else if (m->ca < 0.01f)
1083                         return;
1084         }
1085
1086         if (!backendactive)
1087                 Sys_Error("R_Mesh_Draw: called when backend is not active\n");
1088
1089 #ifdef DEBUGGL
1090         for (i = 0;i < m->numtriangles * 3;i++)
1091                 if ((unsigned int) m->index[i] >= (unsigned int) m->numverts)
1092                         Host_Error("R_Mesh_Draw: invalid index (%i of %i verts)\n", m->index, m->numverts);
1093 #endif
1094
1095         // FIXME: we can work around this by falling back on non-array renderer if buffers are too big
1096         if (m->numtriangles > 1024 || m->numverts > 3072)
1097         {
1098                 Con_Printf("R_Mesh_Draw: mesh too big for 3DFX drivers, rejected\n");
1099                 return;
1100         }
1101
1102         if (m->numtriangles > max_meshs || m->numverts > max_verts)
1103         {
1104                 Con_Printf("R_Mesh_Draw: mesh too big for current gl_mesh_maxtriangles setting, rejected\n");
1105                 return;
1106         }
1107
1108
1109         if (m->transparent)
1110         {
1111                 if (currenttransmesh >= max_transmeshs || (currenttranstriangle + m->numtriangles) > max_transmeshs || (currenttransvertex + m->numverts) > max_transverts)
1112                 {
1113                         if (!transranout)
1114                         {
1115                                 Con_Printf("R_Mesh_Draw: ran out of room for transparent meshs\n");
1116                                 transranout = true;
1117                         }
1118                         return;
1119                 }
1120
1121                 c_transmeshs++;
1122                 c_transtris += m->numtriangles;
1123                 vert = &buf_transvertex[currenttransvertex];
1124                 fcolor = &buf_transfcolor[currenttransvertex];
1125                 for (i = 0;i < backendunits;i++)
1126                         texcoord[i] = &buf_transtexcoord[i][currenttransvertex];
1127
1128                 // transmesh is only for storage of transparent meshs until they
1129                 // are inserted into the main mesh array
1130                 mesh = &buf_transmesh[currenttransmesh++];
1131                 mesh->firsttriangle = currenttranstriangle;
1132                 mesh->firstvert = currenttransvertex;
1133                 index = &buf_transtri[currenttranstriangle].index[0];
1134
1135                 currenttranstriangle += m->numtriangles;
1136                 currenttransvertex += m->numverts;
1137         }
1138         else
1139         {
1140                 if (currentmesh >= max_meshs || (currenttriangle + m->numtriangles) > max_batch || (currentvertex + m->numverts) > max_verts)
1141                         R_Mesh_Render();
1142
1143                 c_meshs++;
1144                 c_meshtris += m->numtriangles;
1145                 vert = &buf_vertex[currentvertex];
1146                 fcolor = &buf_fcolor[currentvertex];
1147                 for (i = 0;i < backendunits;i++)
1148                         texcoord[i] = &buf_texcoord[i][currentvertex];
1149
1150                 // opaque meshs are rendered directly
1151                 mesh = &buf_mesh[currentmesh++];
1152                 mesh->firsttriangle = currenttriangle;
1153                 mesh->firstvert = currentvertex;
1154                 index = &buf_tri[currenttriangle].index[0];
1155
1156                 currenttriangle += m->numtriangles;
1157                 currentvertex += m->numverts;
1158         }
1159
1160         // code shared for transparent and opaque meshs
1161         memcpy(index, m->index, sizeof(int[3]) * m->numtriangles);
1162         mesh->blendfunc1 = m->blendfunc1;
1163         mesh->blendfunc2 = m->blendfunc2;
1164         mesh->depthmask = (m->blendfunc2 == GL_ZERO || m->depthwrite);
1165         mesh->depthtest = !m->depthdisable;
1166         mesh->triangles = m->numtriangles;
1167         mesh->verts = m->numverts;
1168
1169         overbright = false;
1170         scaler = 1;
1171         if (m->blendfunc2 == GL_SRC_COLOR)
1172         {
1173                 if (m->blendfunc1 == GL_DST_COLOR) // 2x modulate with framebuffer
1174                         scaler *= 0.5f;
1175         }
1176         else
1177         {
1178                 if (m->tex[0])
1179                 {
1180                         overbright = gl_combine.integer;
1181                         if (overbright)
1182                                 scaler *= 0.25f;
1183                 }
1184                 scaler *= overbrightscale;
1185         }
1186
1187
1188         j = -1;
1189         for (i = 0;i < backendunits;i++)
1190         {
1191                 if ((mesh->textures[i] = m->tex[i]))
1192                         j = i;
1193                 mesh->texturergbscale[i] = m->texrgbscale[i];
1194                 if (mesh->texturergbscale[i] != 1 && mesh->texturergbscale[i] != 2 && mesh->texturergbscale[i] != 4)
1195                         mesh->texturergbscale[i] = 1;
1196         }
1197         if (overbright && j >= 0)
1198                 mesh->texturergbscale[j] = 4;
1199
1200         if (m->vertexstep != sizeof(buf_vertex_t))
1201         {
1202                 for (i = 0, in = m->vertex;i < m->numverts;i++, (int)in += m->vertexstep)
1203                 {
1204                         vert[i].v[0] = in[0];
1205                         vert[i].v[1] = in[1];
1206                         vert[i].v[2] = in[2];
1207                 }
1208         }
1209         else
1210                 memcpy(vert, m->vertex, m->numverts * sizeof(buf_vertex_t));
1211
1212         if (m->color)
1213         {
1214                 for (i = 0, in = m->color;i < m->numverts;i++, (int)in += m->colorstep)
1215                 {
1216                         fcolor[i].c[0] = in[0] * scaler;
1217                         fcolor[i].c[1] = in[1] * scaler;
1218                         fcolor[i].c[2] = in[2] * scaler;
1219                         fcolor[i].c[3] = in[3];
1220                 }
1221         }
1222         else
1223         {
1224                 cr = m->cr * scaler;
1225                 cg = m->cg * scaler;
1226                 cb = m->cb * scaler;
1227                 ca = m->ca;
1228                 for (i = 0;i < m->numverts;i++)
1229                 {
1230                         fcolor[i].c[0] = cr;
1231                         fcolor[i].c[1] = cg;
1232                         fcolor[i].c[2] = cb;
1233                         fcolor[i].c[3] = ca;
1234                 }
1235         }
1236
1237         for (j = 0;j < MAX_TEXTUREUNITS && m->tex[j];j++)
1238         {
1239                 if (j >= backendunits)
1240                         Sys_Error("R_Mesh_Draw: texture %i supplied when there are only %i texture units\n", j + 1, backendunits);
1241                 if (m->texcoordstep[j] != sizeof(buf_texcoord_t))
1242                 {
1243                         for (i = 0, in = m->texcoords[j];i < m->numverts;i++, (int)in += m->texcoordstep[j])
1244                         {
1245                                 texcoord[j][i].t[0] = in[0];
1246                                 texcoord[j][i].t[1] = in[1];
1247                         }
1248                 }
1249                 else
1250                         memcpy(&texcoord[j][0].t[0], m->texcoords[j], m->numverts * sizeof(buf_texcoord_t));
1251         }
1252         #if 0
1253         for (;j < backendunits;j++)
1254                 memset(&texcoord[j][0].t[0], 0, m->numverts * sizeof(buf_texcoord_t));
1255         #endif
1256
1257         if (currenttriangle >= max_batch)
1258                 R_Mesh_Render();
1259 }
1260
1261 void R_Mesh_Draw_NativeOnly(const rmeshinfo_t *m)
1262 {
1263         // these are static because gcc runs out of virtual registers otherwise
1264         static int i, j, overbright, *index;
1265         static float *in, scaler;
1266         static buf_mesh_t *mesh;
1267         static buf_vertex_t *vert;
1268         static buf_fcolor_t *fcolor;
1269         static buf_texcoord_t *texcoord[MAX_TEXTUREUNITS];
1270
1271         if (!backendactive)
1272                 Sys_Error("R_Mesh_Draw: called when backend is not active\n");
1273
1274         if (m->index == NULL
1275          || !m->numtriangles
1276          || m->vertex == NULL
1277          || !m->numverts)
1278                 Host_Error("R_Mesh_Draw: no triangles or verts\n");
1279
1280         // ignore meaningless alpha meshs
1281         if (!m->depthwrite && m->blendfunc1 == GL_SRC_ALPHA && (m->blendfunc2 == GL_ONE || m->blendfunc2 == GL_ONE_MINUS_SRC_ALPHA))
1282         {
1283                 if (m->color)
1284                 {
1285                         for (i = 0, in = m->color + 3;i < m->numverts;i++, (int)in += m->colorstep)
1286                                 if (*in >= 0.01f)
1287                                         break;
1288                         if (i == m->numverts)
1289                                 return;
1290                 }
1291                 else if (m->ca < 0.01f)
1292                         return;
1293         }
1294
1295         // FIXME: we can work around this by falling back on non-array renderer if buffers are too big
1296         if (m->numtriangles > 1024 || m->numverts > 3072)
1297         {
1298                 Con_Printf("R_Mesh_Draw_NativeOnly: mesh too big for 3DFX drivers, rejected\n");
1299                 return;
1300         }
1301
1302         if (m->numtriangles > max_meshs || m->numverts > max_verts)
1303         {
1304                 Con_Printf("R_Mesh_Draw_NativeOnly: mesh too big for current gl_mesh_maxtriangles setting, rejected\n");
1305                 return;
1306         }
1307
1308
1309         if (m->transparent)
1310         {
1311                 if (currenttransmesh >= max_transmeshs || (currenttranstriangle + m->numtriangles) > max_transmeshs || (currenttransvertex + m->numverts) > max_transverts)
1312                 {
1313                         if (!transranout)
1314                         {
1315                                 Con_Printf("R_Mesh_Draw_NativeOnly: ran out of room for transparent meshs\n");
1316                                 transranout = true;
1317                         }
1318                         return;
1319                 }
1320
1321                 c_transmeshs++;
1322                 c_transtris += m->numtriangles;
1323                 vert = &buf_transvertex[currenttransvertex];
1324                 fcolor = &buf_transfcolor[currenttransvertex];
1325                 for (i = 0;i < backendunits;i++)
1326                         texcoord[i] = &buf_transtexcoord[i][currenttransvertex];
1327
1328                 // transmesh is only for storage of transparent meshs until they
1329                 // are inserted into the main mesh array
1330                 mesh = &buf_transmesh[currenttransmesh++];
1331                 mesh->firsttriangle = currenttranstriangle;
1332                 mesh->firstvert = currenttransvertex;
1333                 index = &buf_transtri[currenttranstriangle].index[0];
1334                 currenttranstriangle += m->numtriangles;
1335                 currenttransvertex += m->numverts;
1336         }
1337         else
1338         {
1339                 if (currentmesh >= max_meshs || (currenttriangle + m->numtriangles) > max_batch || (currentvertex + m->numverts) > max_verts)
1340                         R_Mesh_Render();
1341
1342                 c_meshs++;
1343                 c_meshtris += m->numtriangles;
1344                 vert = &buf_vertex[currentvertex];
1345                 fcolor = &buf_fcolor[currentvertex];
1346                 for (i = 0;i < backendunits;i++)
1347                         texcoord[i] = &buf_texcoord[i][currentvertex];
1348
1349                 // opaque meshs are rendered directly
1350                 mesh = &buf_mesh[currentmesh++];
1351                 mesh->firsttriangle = currenttriangle;
1352                 mesh->firstvert = currentvertex;
1353                 index = &buf_tri[currenttriangle].index[0];
1354                 currenttriangle += m->numtriangles;
1355                 currentvertex += m->numverts;
1356         }
1357
1358         // code shared for transparent and opaque meshs
1359         memcpy(index, m->index, sizeof(int[3]) * m->numtriangles);
1360         mesh->blendfunc1 = m->blendfunc1;
1361         mesh->blendfunc2 = m->blendfunc2;
1362         mesh->depthmask = (m->blendfunc2 == GL_ZERO || m->depthwrite);
1363         mesh->depthtest = !m->depthdisable;
1364         mesh->triangles = m->numtriangles;
1365         mesh->verts = m->numverts;
1366
1367         overbright = false;
1368         scaler = 1;
1369         if (m->blendfunc2 == GL_SRC_COLOR)
1370         {
1371                 if (m->blendfunc1 == GL_DST_COLOR) // 2x modulate with framebuffer
1372                         scaler *= 0.5f;
1373         }
1374         else
1375         {
1376                 if (m->tex[0])
1377                 {
1378                         overbright = gl_combine.integer;
1379                         if (overbright)
1380                                 scaler *= 0.25f;
1381                 }
1382                 scaler *= overbrightscale;
1383         }
1384
1385         j = -1;
1386         for (i = 0;i < backendunits;i++)
1387         {
1388                 if ((mesh->textures[i] = m->tex[i]))
1389                         j = i;
1390                 mesh->texturergbscale[i] = m->texrgbscale[i];
1391                 if (mesh->texturergbscale[i] != 1 && mesh->texturergbscale[i] != 2 && mesh->texturergbscale[i] != 4)
1392                         mesh->texturergbscale[i] = 1;
1393         }
1394         if (overbright && j >= 0)
1395                 mesh->texturergbscale[j] = 4;
1396
1397         if (m->vertexstep != sizeof(buf_vertex_t))
1398                 Host_Error("R_Mesh_Draw_NativeOnly: unsupported vertexstep\n");
1399         if (m->colorstep != sizeof(buf_fcolor_t))
1400                 Host_Error("R_Mesh_Draw_NativeOnly: unsupported colorstep\n");
1401         if (m->color == NULL)
1402                 Host_Error("R_Mesh_Draw_NativeOnly: must provide color array\n");
1403         for (j = 0;j < MAX_TEXTUREUNITS && m->tex[j];j++)
1404         {
1405                 if (j >= backendunits)
1406                         Sys_Error("R_Mesh_Draw_NativeOnly: texture %i supplied when there are only %i texture units\n", j + 1, backendunits);
1407                 if (m->texcoordstep[j] != sizeof(buf_texcoord_t))
1408                         Host_Error("R_Mesh_Draw_NativeOnly: unsupported texcoordstep\n");
1409         }
1410
1411         memcpy(vert, m->vertex, m->numverts * sizeof(buf_vertex_t));
1412         for (j = 0;j < MAX_TEXTUREUNITS && m->tex[j];j++)
1413                 memcpy(&texcoord[j][0].t[0], m->texcoords[j], m->numverts * sizeof(buf_texcoord_t));
1414         #if 0
1415         for (;j < backendunits;j++)
1416                 memset(&texcoord[j][0].t[0], 0, m->numverts * sizeof(buf_texcoord_t));
1417         #endif
1418
1419         memcpy(fcolor, m->color, m->numverts * sizeof(buf_fcolor_t));
1420
1421         // do this as a second step because memcpy preloaded the cache, which we can't easily do
1422         if (scaler != 1)
1423         {
1424                 for (i = 0;i < m->numverts;i++)
1425                 {
1426                         fcolor[i].c[0] *= scaler;
1427                         fcolor[i].c[1] *= scaler;
1428                         fcolor[i].c[2] *= scaler;
1429                 }
1430         }
1431
1432         if (currenttriangle >= max_batch)
1433                 R_Mesh_Render();
1434 }
1435
1436 // allocates space in geometry buffers, and fills in pointers to the buffers in passsed struct
1437 // (this is used for very high speed rendering, no copying)
1438 int R_Mesh_Draw_GetBuffer(rmeshbufferinfo_t *m)
1439 {
1440         // these are static because gcc runs out of virtual registers otherwise
1441         int i, j, overbright;
1442         float scaler;
1443         buf_mesh_t *mesh;
1444
1445         if (!backendactive)
1446                 Sys_Error("R_Mesh_Draw: called when backend is not active\n");
1447
1448         if (!m->numtriangles
1449          || !m->numverts)
1450                 Host_Error("R_Mesh_Draw: no triangles or verts\n");
1451
1452         // FIXME: we can work around this by falling back on non-array renderer if buffers are too big
1453         if (m->numtriangles > 1024 || m->numverts > 3072)
1454         {
1455                 Con_Printf("R_Mesh_Draw_GetBuffer: mesh too big for 3DFX drivers, rejected\n");
1456                 return false;
1457         }
1458
1459         if (m->numtriangles > max_meshs || m->numverts > max_verts)
1460         {
1461                 Con_Printf("R_Mesh_Draw_GetBuffer: mesh too big for current gl_mesh_maxtriangles setting, rejected\n");
1462                 return false;
1463         }
1464
1465
1466         if (m->transparent)
1467         {
1468                 if (currenttransmesh >= max_transmeshs || (currenttranstriangle + m->numtriangles) > max_transmeshs || (currenttransvertex + m->numverts) > max_transverts)
1469                 {
1470                         if (!transranout)
1471                         {
1472                                 Con_Printf("R_Mesh_Draw: ran out of room for transparent meshs\n");
1473                                 transranout = true;
1474                         }
1475                         return false;
1476                 }
1477
1478                 c_transmeshs++;
1479                 c_transtris += m->numtriangles;
1480                 m->index = &buf_transtri[currenttranstriangle].index[0];
1481                 m->vertex = &buf_transvertex[currenttransvertex].v[0];
1482                 m->color = &buf_transfcolor[currenttransvertex].c[0];
1483                 for (i = 0;i < backendunits;i++)
1484                         m->texcoords[i] = &buf_transtexcoord[i][currenttransvertex].t[0];
1485
1486                 // transmesh is only for storage of transparent meshs until they
1487                 // are inserted into the main mesh array
1488                 mesh = &buf_transmesh[currenttransmesh++];
1489                 mesh->firsttriangle = currenttranstriangle;
1490                 mesh->firstvert = currenttransvertex;
1491                 currenttranstriangle += m->numtriangles;
1492                 currenttransvertex += m->numverts;
1493         }
1494         else
1495         {
1496                 if (currentmesh >= max_meshs || (currenttriangle + m->numtriangles) > max_batch || (currentvertex + m->numverts) > max_verts)
1497                         R_Mesh_Render();
1498
1499                 c_meshs++;
1500                 c_meshtris += m->numtriangles;
1501                 m->index = &buf_tri[currenttriangle].index[0];
1502                 m->vertex = &buf_vertex[currentvertex].v[0];
1503                 m->color = &buf_fcolor[currentvertex].c[0];
1504                 for (i = 0;i < backendunits;i++)
1505                         m->texcoords[i] = &buf_texcoord[i][currentvertex].t[0];
1506
1507                 // opaque meshs are rendered directly
1508                 mesh = &buf_mesh[currentmesh++];
1509                 mesh->firsttriangle = currenttriangle;
1510                 mesh->firstvert = currentvertex;
1511                 currenttriangle += m->numtriangles;
1512                 currentvertex += m->numverts;
1513         }
1514
1515         // code shared for transparent and opaque meshs
1516         mesh->blendfunc1 = m->blendfunc1;
1517         mesh->blendfunc2 = m->blendfunc2;
1518         mesh->depthmask = (m->blendfunc2 == GL_ZERO || m->depthwrite);
1519         mesh->depthtest = !m->depthdisable;
1520         mesh->triangles = m->numtriangles;
1521         mesh->verts = m->numverts;
1522
1523         overbright = false;
1524         scaler = 1;
1525         if (m->blendfunc2 == GL_SRC_COLOR)
1526         {
1527                 if (m->blendfunc1 == GL_DST_COLOR) // 2x modulate with framebuffer
1528                         scaler *= 0.5f;
1529         }
1530         else
1531         {
1532                 if (m->tex[0])
1533                 {
1534                         overbright = gl_combine.integer;
1535                         if (overbright)
1536                                 scaler *= 0.25f;
1537                 }
1538                 scaler *= overbrightscale;
1539         }
1540         m->colorscale = scaler;
1541
1542         j = -1;
1543         for (i = 0;i < MAX_TEXTUREUNITS;i++)
1544         {
1545                 if ((mesh->textures[i] = m->tex[i]))
1546                 {
1547                         j = i;
1548                         if (i >= backendunits)
1549                                 Sys_Error("R_Mesh_Draw_GetBuffer: texture %i supplied when there are only %i texture units\n", j + 1, backendunits);
1550                 }
1551                 mesh->texturergbscale[i] = m->texrgbscale[i];
1552                 if (mesh->texturergbscale[i] != 1 && mesh->texturergbscale[i] != 2 && mesh->texturergbscale[i] != 4)
1553                         mesh->texturergbscale[i] = 1;
1554         }
1555         if (overbright && j >= 0)
1556                 mesh->texturergbscale[j] = 4;
1557
1558         return true;
1559 }
1560
1561 void R_Mesh_DrawPolygon(rmeshinfo_t *m, int numverts)
1562 {
1563         m->index = polyindexarray;
1564         m->numverts = numverts;
1565         m->numtriangles = numverts - 2;
1566         if (m->numtriangles < 1)
1567         {
1568                 Con_Printf("R_Mesh_DrawPolygon: invalid vertex count\n");
1569                 return;
1570         }
1571         if (m->numtriangles >= 256)
1572         {
1573                 Con_Printf("R_Mesh_DrawPolygon: only up to 256 triangles (258 verts) supported\n");
1574                 return;
1575         }
1576         R_Mesh_Draw(m);
1577 }
1578
1579 /*
1580 ==============================================================================
1581
1582                                                 SCREEN SHOTS
1583
1584 ==============================================================================
1585 */
1586
1587 qboolean SCR_ScreenShot(char *filename, int x, int y, int width, int height)
1588 {
1589         qboolean ret;
1590         int i;
1591         qbyte *buffer;
1592
1593         if (!r_render.integer)
1594                 return false;
1595
1596         buffer = Mem_Alloc(tempmempool, width*height*3);
1597         qglReadPixels (x, y, width, height, GL_RGB, GL_UNSIGNED_BYTE, buffer);
1598         CHECKGLERROR
1599
1600         // LordHavoc: compensate for v_overbrightbits when using hardware gamma
1601         if (v_hwgamma.integer)
1602                 for (i = 0;i < width * height * 3;i++)
1603                         buffer[i] <<= v_overbrightbits.integer;
1604
1605         ret = Image_WriteTGARGB_preflipped(filename, width, height, buffer);
1606
1607         Mem_Free(buffer);
1608         return ret;
1609 }
1610
1611 //=============================================================================
1612
1613 void R_ClearScreen(void)
1614 {
1615         if (r_render.integer)
1616         {
1617                 // clear to black
1618                 qglClearColor(0,0,0,0);CHECKGLERROR
1619                 // clear the screen
1620                 qglClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);CHECKGLERROR
1621                 // set dithering mode
1622                 if (gl_dither.integer)
1623                 {
1624                         qglEnable(GL_DITHER);CHECKGLERROR
1625                 }
1626                 else
1627                 {
1628                         qglDisable(GL_DITHER);CHECKGLERROR
1629                 }
1630         }
1631 }
1632
1633 /*
1634 ==================
1635 SCR_UpdateScreen
1636
1637 This is called every frame, and can also be called explicitly to flush
1638 text to the screen.
1639 ==================
1640 */
1641 void SCR_UpdateScreen (void)
1642 {
1643         //Mem_CheckSentinelsGlobal();
1644         //R_TimeReport("memtest");
1645
1646         VID_Finish ();
1647
1648         R_TimeReport("finish");
1649
1650         if (gl_combine.integer && !gl_combine_extension)
1651                 Cvar_SetValue("gl_combine", 0);
1652
1653         lightscalebit = v_overbrightbits.integer;
1654         if (gl_combine.integer && r_multitexture.integer)
1655                 lightscalebit += 2;
1656
1657         lightscale = 1.0f / (float) (1 << lightscalebit);
1658         overbrightscale = 1.0f / (float) (1 << v_overbrightbits.integer);
1659
1660         R_TimeReport("setup");
1661
1662         R_ClearScreen();
1663
1664         R_TimeReport("clear");
1665
1666         if (scr_conlines < vid.conheight)
1667                 R_RenderView();
1668
1669         // draw 2D stuff
1670         R_DrawQueue();
1671
1672         // tell driver to commit it's partially full geometry queue to the rendering queue
1673         // (this doesn't wait for the commands themselves to complete)
1674         qglFlush();
1675 }