gl_backend.c

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