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", "8192"};
   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_floatcolors = {0, "gl_mesh_floatcolors", "0"};
   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 #ifdef DEBUGGL
  15 int errornumber = 0;
  16
  17 void GL_PrintError(int errornumber, char *filename, int linenumber)
  18 {
  19         switch(errornumber)
  20         {
  21 #ifdef GL_INVALID_ENUM
  22         case GL_INVALID_ENUM:
  23                 Con_Printf("GL_INVALID_ENUM at %s:%i\n", filename, linenumber);
  24                 break;
  25 #endif
  26 #ifdef GL_INVALID_VALUE
  27         case GL_INVALID_VALUE:
  28                 Con_Printf("GL_INVALID_VALUE at %s:%i\n", filename, linenumber);
  29                 break;
  30 #endif
  31 #ifdef GL_INVALID_OPERATION
  32         case GL_INVALID_OPERATION:
  33                 Con_Printf("GL_INVALID_OPERATION at %s:%i\n", filename, linenumber);
  34                 break;
  35 #endif
  36 #ifdef GL_STACK_OVERFLOW
  37         case GL_STACK_OVERFLOW:
  38                 Con_Printf("GL_STACK_OVERFLOW at %s:%i\n", filename, linenumber);
  39                 break;
  40 #endif
  41 #ifdef GL_STACK_UNDERFLOW
  42         case GL_STACK_UNDERFLOW:
  43                 Con_Printf("GL_STACK_UNDERFLOW at %s:%i\n", filename, linenumber);
  44                 break;
  45 #endif
  46 #ifdef GL_OUT_OF_MEMORY
  47         case GL_OUT_OF_MEMORY:
  48                 Con_Printf("GL_OUT_OF_MEMORY at %s:%i\n", filename, linenumber);
  49                 break;
  50 #endif
  51 #ifdef GL_TABLE_TOO_LARGE
  52     case GL_TABLE_TOO_LARGE:
  53                 Con_Printf("GL_TABLE_TOO_LARGE at %s:%i\n", filename, linenumber);
  54                 break;
  55 #endif
  56         default:
  57                 Con_Printf("GL UNKNOWN (%i) at %s:%i\n", errornumber, filename, linenumber);
  58                 break;
  59         }
  60 }
  61 #endif
  62
  63 float r_farclip, r_newfarclip;
  64
  65 int polyindexarray[768];
  66
  67 static float viewdist;
  68
  69 int c_meshs, c_meshtris, c_transmeshs, c_transtris;
  70
  71 int                     lightscalebit;
  72 float           lightscale;
  73 float           overbrightscale;
  74
  75 void SCR_ScreenShot_f (void);
  76
  77 static int max_meshs;
  78 static int max_batch;
  79 static int max_verts; // always max_meshs * 3
  80 #define TRANSDEPTHRES 4096
  81
  82 typedef struct buf_mesh_s
  83 {
  84         int depthmask;
  85         int depthtest;
  86         int blendfunc1, blendfunc2;
  87         int textures[MAX_TEXTUREUNITS];
  88         float texturergbscale[MAX_TEXTUREUNITS];
  89         int firsttriangle;
  90         int triangles;
  91         int firstvert;
  92         int verts;
  93         struct buf_mesh_s *chain;
  94         struct buf_transtri_s *transchain;
  95 }
  96 buf_mesh_t;
  97
  98 typedef struct buf_transtri_s
  99 {
 100         struct buf_transtri_s *next;
 101         struct buf_transtri_s *meshsortchain;
 102         buf_mesh_t *mesh;
 103         int index[3];
 104 }
 105 buf_transtri_t;
 106
 107 typedef struct buf_tri_s
 108 {
 109         int index[3];
 110 }
 111 buf_tri_t;
 112
 113 typedef struct
 114 {
 115         float v[4];
 116 }
 117 buf_vertex_t;
 118
 119 typedef struct
 120 {
 121         float c[4];
 122 }
 123 buf_fcolor_t;
 124
 125 typedef struct
 126 {
 127         qbyte c[4];
 128 }
 129 buf_bcolor_t;
 130
 131 typedef struct
 132 {
 133         float t[2];
 134 }
 135 buf_texcoord_t;
 136
 137 static float meshfarclip;
 138 static int currentmesh, currenttriangle, currentvertex, backendunits, backendactive, transranout;
 139 static buf_mesh_t *buf_mesh;
 140 static buf_tri_t *buf_tri;
 141 static buf_vertex_t *buf_vertex;
 142 static buf_fcolor_t *buf_fcolor;
 143 static buf_bcolor_t *buf_bcolor;
 144 static buf_texcoord_t *buf_texcoord[MAX_TEXTUREUNITS];
 145
 146 static int currenttransmesh, currenttransvertex, currenttranstriangle;
 147 static buf_mesh_t *buf_transmesh;
 148 static buf_transtri_t *buf_sorttranstri;
 149 static buf_transtri_t **buf_sorttranstri_list;
 150 static buf_tri_t *buf_transtri;
 151 static buf_vertex_t *buf_transvertex;
 152 static buf_fcolor_t *buf_transfcolor;
 153 static buf_texcoord_t *buf_transtexcoord[MAX_TEXTUREUNITS];
 154
 155 static mempool_t *gl_backend_mempool;
 156 static int resizingbuffers = false;
 157
 158 static void gl_backend_start(void)
 159 {
 160         int i;
 161
 162         max_verts = max_meshs * 3;
 163
 164         if (!gl_backend_mempool)
 165                 gl_backend_mempool = Mem_AllocPool("GL_Backend");
 166
 167 #define BACKENDALLOC(var, count, sizeofstruct)\
 168         {\
 169                 var = Mem_Alloc(gl_backend_mempool, count * sizeof(sizeofstruct));\
 170                 if (var == NULL)\
 171                         Sys_Error("gl_backend_start: unable to allocate memory\n");\
 172                 memset(var, 0, count * sizeof(sizeofstruct));\
 173         }
 174
 175         BACKENDALLOC(buf_mesh, max_meshs, buf_mesh_t)
 176         BACKENDALLOC(buf_tri, max_meshs, buf_tri_t)
 177         BACKENDALLOC(buf_vertex, max_verts, buf_vertex_t)
 178         BACKENDALLOC(buf_fcolor, max_verts, buf_fcolor_t)
 179         BACKENDALLOC(buf_bcolor, max_verts, buf_bcolor_t)
 180
 181         BACKENDALLOC(buf_transmesh, max_meshs, buf_mesh_t)
 182         BACKENDALLOC(buf_sorttranstri, max_meshs, buf_transtri_t)
 183         BACKENDALLOC(buf_sorttranstri_list, TRANSDEPTHRES, buf_transtri_t *)
 184         BACKENDALLOC(buf_transtri, max_meshs, buf_tri_t)
 185         BACKENDALLOC(buf_transvertex, max_verts, buf_vertex_t)
 186         BACKENDALLOC(buf_transfcolor, max_verts, buf_fcolor_t)
 187
 188         for (i = 0;i < MAX_TEXTUREUNITS;i++)
 189         {
 190                 // only allocate as many texcoord arrays as we need
 191                 if (i < gl_textureunits)
 192                 {
 193                         BACKENDALLOC(buf_texcoord[i], max_verts, buf_texcoord_t)
 194                         BACKENDALLOC(buf_transtexcoord[i], max_verts, buf_texcoord_t)
 195                 }
 196                 else
 197                 {
 198                         buf_texcoord[i] = NULL;
 199                         buf_transtexcoord[i] = NULL;
 200                 }
 201         }
 202         backendunits = min(MAX_TEXTUREUNITS, gl_textureunits);
 203         backendactive = true;
 204 }
 205
 206 static void gl_backend_shutdown(void)
 207 {
 208         if (resizingbuffers)
 209                 Mem_EmptyPool(gl_backend_mempool);
 210         else
 211                 Mem_FreePool(&gl_backend_mempool);
 212
 213         backendunits = 0;
 214         backendactive = false;
 215 }
 216
 217 static void gl_backend_bufferchanges(int init)
 218 {
 219         // 21760 is (65536 / 3) rounded off to a multiple of 128
 220         if (gl_mesh_maxtriangles.integer < 256)
 221                 Cvar_SetValue("gl_mesh_maxtriangles", 256);
 222         if (gl_mesh_maxtriangles.integer > 21760)
 223                 Cvar_SetValue("gl_mesh_maxtriangles", 21760);
 224
 225         if (gl_mesh_batchtriangles.integer < 0)
 226                 Cvar_SetValue("gl_mesh_batchtriangles", 0);
 227         if (gl_mesh_batchtriangles.integer > gl_mesh_maxtriangles.integer)
 228                 Cvar_SetValue("gl_mesh_batchtriangles", gl_mesh_maxtriangles.integer);
 229
 230         max_batch = gl_mesh_batchtriangles.integer;
 231
 232         if (max_meshs != gl_mesh_maxtriangles.integer)
 233         {
 234                 max_meshs = gl_mesh_maxtriangles.integer;
 235
 236                 if (!init)
 237                 {
 238                         resizingbuffers = true;
 239                         gl_backend_shutdown();
 240                         gl_backend_start();
 241                         resizingbuffers = false;
 242                 }
 243         }
 244 }
 245
 246 static void gl_backend_newmap(void)
 247 {
 248         r_farclip = r_newfarclip = 2048.0f;
 249 }
 250
 251 void gl_backend_init(void)
 252 {
 253         int i;
 254
 255         Cvar_RegisterVariable(&r_render);
 256         Cvar_RegisterVariable(&gl_dither);
 257         Cvar_RegisterVariable(&gl_lockarrays);
 258 #ifdef NORENDER
 259         Cvar_SetValue("r_render", 0);
 260 #endif
 261
 262         Cvar_RegisterVariable(&gl_mesh_maxtriangles);
 263         Cvar_RegisterVariable(&gl_mesh_batchtriangles);
 264         Cvar_RegisterVariable(&gl_mesh_floatcolors);
 265         R_RegisterModule("GL_Backend", gl_backend_start, gl_backend_shutdown, gl_backend_newmap);
 266         gl_backend_bufferchanges(true);
 267         for (i = 0;i < 256;i++)
 268         {
 269                 polyindexarray[i*3+0] = 0;
 270                 polyindexarray[i*3+1] = i + 1;
 271                 polyindexarray[i*3+2] = i + 2;
 272         }
 273 }
 274
 275 int arraylocked = false;
 276
 277 void GL_LockArray(int first, int count)
 278 {
 279         if (!arraylocked && gl_supportslockarrays && gl_lockarrays.integer)
 280         {
 281                 qglLockArraysEXT(first, count);
 282                 CHECKGLERROR
 283                 arraylocked = true;
 284         }
 285 }
 286
 287 void GL_UnlockArray(void)
 288 {
 289         if (arraylocked)
 290         {
 291                 qglUnlockArraysEXT();
 292                 CHECKGLERROR
 293                 arraylocked = false;
 294         }
 295 }
 296
 297 //static float gldepthmin, gldepthmax;
 298
 299 /*
 300 =============
 301 GL_SetupFrame
 302 =============
 303 */
 304 static void GL_SetupFrame (void)
 305 {
 306         double xmax, ymax;
 307         double fovx, fovy, zNear, zFar, aspect;
 308
 309         // update farclip based on previous frame
 310         r_farclip = r_newfarclip;
 311
 312         if (!r_render.integer)
 313                 return;
 314
 315 //      glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // LordHavoc: moved to SCR_UpdateScreen
 316 //      gldepthmin = 0;
 317 //      gldepthmax = 1;
 318         glDepthFunc (GL_LEQUAL);CHECKGLERROR
 319
 320 //      glDepthRange (gldepthmin, gldepthmax);CHECKGLERROR
 321
 322         // set up viewpoint
 323         glMatrixMode(GL_PROJECTION);CHECKGLERROR
 324         glLoadIdentity ();CHECKGLERROR
 325
 326         // y is weird beause OpenGL is bottom to top, we use top to bottom
 327         glViewport(r_refdef.x, vid.realheight - (r_refdef.y + r_refdef.height), r_refdef.width, r_refdef.height);CHECKGLERROR
 328
 329         // depth range
 330         zNear = 1.0;
 331         zFar = r_farclip;
 332
 333         // fov angles
 334         fovx = r_refdef.fov_x;
 335         fovy = r_refdef.fov_y;
 336         aspect = r_refdef.width / r_refdef.height;
 337
 338         // pyramid slopes
 339         xmax = zNear * tan(fovx * M_PI / 360.0) * aspect;
 340         ymax = zNear * tan(fovy * M_PI / 360.0);
 341
 342         // set view pyramid
 343         glFrustum(-xmax, xmax, -ymax, ymax, zNear, zFar);CHECKGLERROR
 344
 345 //      glCullFace(GL_FRONT);CHECKGLERROR
 346
 347         glMatrixMode(GL_MODELVIEW);CHECKGLERROR
 348         glLoadIdentity ();CHECKGLERROR
 349
 350         // put Z going up
 351         glRotatef (-90,  1, 0, 0);CHECKGLERROR
 352         glRotatef (90,  0, 0, 1);CHECKGLERROR
 353         // camera rotation
 354         glRotatef (-r_refdef.viewangles[2],  1, 0, 0);CHECKGLERROR
 355         glRotatef (-r_refdef.viewangles[0],  0, 1, 0);CHECKGLERROR
 356         glRotatef (-r_refdef.viewangles[1],  0, 0, 1);CHECKGLERROR
 357         // camera location
 358         glTranslatef (-r_refdef.vieworg[0],  -r_refdef.vieworg[1],  -r_refdef.vieworg[2]);CHECKGLERROR
 359
 360 //      glGetFloatv (GL_MODELVIEW_MATRIX, r_world_matrix);
 361
 362         //
 363         // set drawing parms
 364         //
 365 //      if (gl_cull.integer)
 366 //      {
 367 //              glEnable(GL_CULL_FACE);CHECKGLERROR
 368 //      }
 369 //      else
 370 //      {
 371 //              glDisable(GL_CULL_FACE);CHECKGLERROR
 372 //      }
 373
 374 //      glEnable(GL_BLEND);CHECKGLERROR
 375 //      glEnable(GL_DEPTH_TEST);CHECKGLERROR
 376 //      glDepthMask(1);CHECKGLERROR
 377 }
 378
 379 static int mesh_blendfunc1;
 380 static int mesh_blendfunc2;
 381 static int mesh_blend;
 382 static GLboolean mesh_depthmask;
 383 static int mesh_depthtest;
 384 static int mesh_unit;
 385 static int mesh_clientunit;
 386 static int mesh_texture[MAX_TEXTUREUNITS];
 387 static float mesh_texturergbscale[MAX_TEXTUREUNITS];
 388
 389 // called at beginning of frame
 390 void R_Mesh_Start(void)
 391 {
 392         int i;
 393         if (!backendactive)
 394                 Sys_Error("R_Mesh_Clear: called when backend is not active\n");
 395
 396         CHECKGLERROR
 397
 398         gl_backend_bufferchanges(false);
 399
 400         currentmesh = 0;
 401         currenttriangle = 0;
 402         currentvertex = 0;
 403         currenttransmesh = 0;
 404         currenttranstriangle = 0;
 405         currenttransvertex = 0;
 406         meshfarclip = 0;
 407         transranout = false;
 408         viewdist = DotProduct(r_origin, vpn);
 409
 410         c_meshs = 0;
 411         c_meshtris = 0;
 412         c_transmeshs = 0;
 413         c_transtris = 0;
 414
 415         GL_SetupFrame();
 416
 417         mesh_unit = 0;
 418         mesh_clientunit = 0;
 419
 420         for (i = 0;i < backendunits;i++)
 421         {
 422                 mesh_texture[i] = 0;
 423                 mesh_texturergbscale[i] = 1;
 424         }
 425
 426         glEnable(GL_CULL_FACE);CHECKGLERROR
 427         glCullFace(GL_FRONT);CHECKGLERROR
 428
 429         mesh_depthtest = true;
 430         glEnable(GL_DEPTH_TEST);CHECKGLERROR
 431
 432         mesh_blendfunc1 = GL_ONE;
 433         mesh_blendfunc2 = GL_ZERO;
 434         glBlendFunc(mesh_blendfunc1, mesh_blendfunc2);CHECKGLERROR
 435
 436         mesh_blend = 0;
 437         glDisable(GL_BLEND);CHECKGLERROR
 438
 439         mesh_depthmask = GL_TRUE;
 440         glDepthMask(mesh_depthmask);CHECKGLERROR
 441
 442         glVertexPointer(3, GL_FLOAT, sizeof(buf_vertex_t), &buf_vertex[0].v[0]);CHECKGLERROR
 443         glEnableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 444         if (gl_mesh_floatcolors.integer)
 445         {
 446                 glColorPointer(4, GL_FLOAT, sizeof(buf_fcolor_t), &buf_fcolor[0].c[0]);CHECKGLERROR
 447         }
 448         else
 449         {
 450                 glColorPointer(4, GL_UNSIGNED_BYTE, sizeof(buf_bcolor_t), &buf_bcolor[0].c[0]);CHECKGLERROR
 451         }
 452         glEnableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 453
 454         if (backendunits > 1)
 455         {
 456                 for (i = 0;i < backendunits;i++)
 457                 {
 458                         qglActiveTexture(GL_TEXTURE0_ARB + (mesh_unit = i));CHECKGLERROR
 459                         glBindTexture(GL_TEXTURE_2D, mesh_texture[i]);CHECKGLERROR
 460                         glDisable(GL_TEXTURE_2D);CHECKGLERROR
 461                         if (gl_combine.integer)
 462                         {
 463                                 glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);CHECKGLERROR
 464                                 glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_MODULATE);CHECKGLERROR
 465                                 glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE);CHECKGLERROR
 466                                 glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 467                                 glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_RGB_ARB, GL_CONSTANT_ARB);CHECKGLERROR
 468                                 glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 469                                 glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 470                                 glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_RGB_ARB, GL_SRC_ALPHA);CHECKGLERROR
 471                                 glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, GL_MODULATE);CHECKGLERROR
 472                                 glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA_ARB, GL_TEXTURE);CHECKGLERROR
 473                                 glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_ALPHA_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 474                                 glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_ALPHA_ARB, GL_CONSTANT_ARB);CHECKGLERROR
 475                                 glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 476                                 glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 477                                 glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 478                                 glTexEnvf(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, mesh_texturergbscale[i]);CHECKGLERROR
 479                                 glTexEnvf(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1.0f);CHECKGLERROR
 480                         }
 481                         else
 482                         {
 483                                 glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 484                         }
 485
 486                         qglClientActiveTexture(GL_TEXTURE0_ARB + (mesh_clientunit = i));CHECKGLERROR
 487                         glTexCoordPointer(2, GL_FLOAT, sizeof(buf_texcoord_t), buf_texcoord[i]);CHECKGLERROR
 488                         glEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 489                 }
 490         }
 491         else
 492         {
 493                 glBindTexture(GL_TEXTURE_2D, (mesh_texture[0] = 0));CHECKGLERROR
 494                 glDisable(GL_TEXTURE_2D);CHECKGLERROR
 495                 glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 496
 497                 glTexCoordPointer(2, GL_FLOAT, sizeof(buf_texcoord_t), buf_texcoord[0]);CHECKGLERROR
 498                 glEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 499         }
 500 }
 501
 502 // renders mesh buffers, called to flush buffers when full
 503 void R_Mesh_Render(void)
 504 {
 505         int i;
 506         int k;
 507         int firsttriangle;
 508         int endtriangle;
 509         int indexcount;
 510         int firstvert;
 511         int endvert;
 512         float farclip;
 513         buf_mesh_t *mesh;
 514         unsigned int *index;
 515         // float to byte color conversion
 516         int *icolor;
 517         float *fcolor;
 518         qbyte *bcolor;
 519
 520         if (!backendactive)
 521                 Sys_Error("R_Mesh_Render: called when backend is not active\n");
 522
 523         if (!currentmesh)
 524                 return;
 525
 526         CHECKGLERROR
 527
 528         // push out farclip based on vertices
 529         // FIXME: wouldn't this be a little slow when using matrix transforms?
 530         for (i = 0;i < currentvertex;i++)
 531         {
 532                 farclip = DotProduct(buf_vertex[i].v, vpn);
 533                 if (meshfarclip < farclip)
 534                         meshfarclip = farclip;
 535         }
 536
 537         farclip = meshfarclip + 256.0f - viewdist; // + 256 just to be safe
 538
 539         // push out farclip for next frame
 540         if (farclip > r_newfarclip)
 541                 r_newfarclip = ceil((farclip + 255) / 256) * 256 + 256;
 542
 543         if (!gl_mesh_floatcolors.integer)
 544         {
 545                 // shift float to have 8bit fraction at base of number
 546                 for (i = 0, fcolor = &buf_fcolor->c[0];i < currentvertex;i++)
 547                 {
 548                         *fcolor++ += 32768.0f;
 549                         *fcolor++ += 32768.0f;
 550                         *fcolor++ += 32768.0f;
 551                         *fcolor++ += 32768.0f;
 552                 }
 553                 // then read as integer and kill float bits...
 554                 for (i = 0, icolor = (int *)&buf_fcolor->c[0], bcolor = &buf_bcolor->c[0];i < currentvertex;i++)
 555                 {
 556                         k = (*icolor++) & 0x7FFFFF;*bcolor++ = k > 255 ? 255 : k;
 557                         k = (*icolor++) & 0x7FFFFF;*bcolor++ = k > 255 ? 255 : k;
 558                         k = (*icolor++) & 0x7FFFFF;*bcolor++ = k > 255 ? 255 : k;
 559                         k = (*icolor++) & 0x7FFFFF;*bcolor++ = k > 255 ? 255 : k;
 560                 }
 561         }
 562
 563         // lock the arrays now that they will have no further modifications
 564         //GL_LockArray(0, currentvertex);CHECKGLERROR
 565
 566         for (k = 0, mesh = buf_mesh;k < currentmesh;k++, mesh++)
 567         {
 568                 if (backendunits > 1)
 569                 {
 570                         for (i = 0;i < backendunits;i++)
 571                         {
 572                                 if (mesh_texture[i] != mesh->textures[i])
 573                                 {
 574                                         if (mesh_unit != i)
 575                                         {
 576                                                 qglActiveTexture(GL_TEXTURE0_ARB + (mesh_unit = i));CHECKGLERROR
 577                                         }
 578                                         if (mesh_texture[i] == 0)
 579                                         {
 580                                                 glEnable(GL_TEXTURE_2D);CHECKGLERROR
 581                                                 // have to disable texcoord array on disabled texture
 582                                                 // units due to NVIDIA driver bug with
 583                                                 // compiled_vertex_array
 584                                                 if (mesh_clientunit != i)
 585                                                 {
 586                                                         qglClientActiveTexture(GL_TEXTURE0_ARB + (mesh_clientunit = i));CHECKGLERROR
 587                                                 }
 588                                                 glEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 589                                         }
 590                                         glBindTexture(GL_TEXTURE_2D, (mesh_texture[i] = mesh->textures[i]));CHECKGLERROR
 591                                         if (mesh_texture[i] == 0)
 592                                         {
 593                                                 glDisable(GL_TEXTURE_2D);CHECKGLERROR
 594                                                 // have to disable texcoord array on disabled texture
 595                                                 // units due to NVIDIA driver bug with
 596                                                 // compiled_vertex_array
 597                                                 if (mesh_clientunit != i)
 598                                                 {
 599                                                         qglClientActiveTexture(GL_TEXTURE0_ARB + (mesh_clientunit = i));CHECKGLERROR
 600                                                 }
 601                                                 glDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 602                                         }
 603                                 }
 604                                 if (mesh_texturergbscale[i] != mesh->texturergbscale[i])
 605                                 {
 606                                         if (mesh_unit != i)
 607                                         {
 608                                                 qglActiveTexture(GL_TEXTURE0_ARB + (mesh_unit = i));CHECKGLERROR
 609                                         }
 610                                         glTexEnvf(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, (mesh_texturergbscale[i] = mesh->texturergbscale[i]));CHECKGLERROR
 611                                 }
 612                         }
 613                 }
 614                 else
 615                 {
 616                         if (mesh_texture[0] != mesh->textures[0])
 617                         {
 618                                 if (mesh_texture[0] == 0)
 619                                 {
 620                                         glEnable(GL_TEXTURE_2D);CHECKGLERROR
 621                                         glEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 622                                 }
 623                                 glBindTexture(GL_TEXTURE_2D, (mesh_texture[0] = mesh->textures[0]));CHECKGLERROR
 624                                 if (mesh_texture[0] == 0)
 625                                 {
 626                                         glDisable(GL_TEXTURE_2D);CHECKGLERROR
 627                                         glDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 628                                 }
 629                         }
 630                 }
 631                 if (mesh_blendfunc1 != mesh->blendfunc1 || mesh_blendfunc2 != mesh->blendfunc2)
 632                 {
 633                         glBlendFunc(mesh_blendfunc1 = mesh->blendfunc1, mesh_blendfunc2 = mesh->blendfunc2);CHECKGLERROR
 634                         if (mesh_blendfunc2 == GL_ZERO)
 635                         {
 636                                 if (mesh_blendfunc1 == GL_ONE)
 637                                 {
 638                                         if (mesh_blend)
 639                                         {
 640                                                 mesh_blend = 0;
 641                                                 glDisable(GL_BLEND);CHECKGLERROR
 642                                         }
 643                                 }
 644                                 else
 645                                 {
 646                                         if (!mesh_blend)
 647                                         {
 648                                                 mesh_blend = 1;
 649                                                 glEnable(GL_BLEND);CHECKGLERROR
 650                                         }
 651                                 }
 652                         }
 653                         else
 654                         {
 655                                 if (!mesh_blend)
 656                                 {
 657                                         mesh_blend = 1;
 658                                         glEnable(GL_BLEND);CHECKGLERROR
 659                                 }
 660                         }
 661                 }
 662                 if (mesh_depthtest != mesh->depthtest)
 663                 {
 664                         mesh_depthtest = mesh->depthtest;
 665                         if (mesh_depthtest)
 666                                 glEnable(GL_DEPTH_TEST);
 667                         else
 668                                 glDisable(GL_DEPTH_TEST);
 669                 }
 670                 if (mesh_depthmask != mesh->depthmask)
 671                 {
 672                         glDepthMask(mesh_depthmask = mesh->depthmask);CHECKGLERROR
 673                 }
 674
 675                 firsttriangle = mesh->firsttriangle;
 676                 firstvert = mesh->firstvert;
 677                 endtriangle = firsttriangle + mesh->triangles;
 678                 endvert = firstvert + mesh->verts;
 679
 680                 indexcount = (endtriangle - firsttriangle) * 3;
 681                 index = (unsigned int *)&buf_tri[firsttriangle].index[0];
 682
 683                 // if not using batching, skip the index adjustment
 684                 if (firstvert != 0)
 685                         for (i = 0;i < indexcount;i++)
 686                                 index[i] += firstvert;
 687
 688                 // lock arrays (this is ignored if already locked)
 689                 CHECKGLERROR
 690                 GL_LockArray(0, currentvertex);
 691 #ifdef WIN32
 692                 // FIXME: dynamic link to GL so we can get DrawRangeElements on WIN32
 693                 glDrawElements(GL_TRIANGLES, indexcount, GL_UNSIGNED_INT, index);CHECKGLERROR
 694 #else
 695                 glDrawRangeElements(GL_TRIANGLES, firstvert, endvert, indexcount, GL_UNSIGNED_INT, index);CHECKGLERROR
 696 #endif
 697         }
 698
 699         currentmesh = 0;
 700         currenttriangle = 0;
 701         currentvertex = 0;
 702
 703         GL_UnlockArray();CHECKGLERROR
 704 }
 705
 706 // restores backend state, used when done with 3D rendering
 707 void R_Mesh_Finish(void)
 708 {
 709         int i;
 710         // flush any queued meshs
 711         R_Mesh_Render();
 712
 713         if (backendunits > 1)
 714         {
 715                 for (i = backendunits - 1;i >= 0;i--)
 716                 {
 717                         qglActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
 718                         glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 719                         if (gl_combine.integer)
 720                         {
 721                                 glTexEnvf(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1.0f);CHECKGLERROR
 722                         }
 723                         if (i > 0)
 724                         {
 725                                 glDisable(GL_TEXTURE_2D);CHECKGLERROR
 726                         }
 727                         else
 728                         {
 729                                 glEnable(GL_TEXTURE_2D);CHECKGLERROR
 730                         }
 731                         glBindTexture(GL_TEXTURE_2D, 0);CHECKGLERROR
 732
 733                         qglClientActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
 734                         glDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 735                 }
 736         }
 737         else
 738         {
 739                 glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 740                 glEnable(GL_TEXTURE_2D);CHECKGLERROR
 741                 glDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 742         }
 743         glDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 744         glDisableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 745
 746         glDisable(GL_BLEND);CHECKGLERROR
 747         glEnable(GL_DEPTH_TEST);CHECKGLERROR
 748         glDepthMask(true);CHECKGLERROR
 749         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);CHECKGLERROR
 750 }
 751
 752 void R_Mesh_ClearDepth(void)
 753 {
 754         R_Mesh_AddTransparent();
 755         R_Mesh_Finish();
 756         glClear(GL_DEPTH_BUFFER_BIT);
 757         R_Mesh_Start();
 758 }
 759
 760 void R_Mesh_AddTransparent(void)
 761 {
 762         int i, j, k, *index;
 763         float viewdistcompare, centerscaler, dist1, dist2, dist3, center, maxdist;
 764         buf_vertex_t *vert1, *vert2, *vert3;
 765         buf_transtri_t *tri;
 766         buf_mesh_t *mesh, *transmesh;
 767
 768         if (!currenttransmesh)
 769                 return;
 770
 771         // convert index data to transtris for sorting
 772         for (j = 0;j < currenttransmesh;j++)
 773         {
 774                 mesh = buf_transmesh + j;
 775                 k = mesh->firsttriangle;
 776                 index = &buf_transtri[k].index[0];
 777                 for (i = 0;i < mesh->triangles;i++)
 778                 {
 779                         tri = &buf_sorttranstri[k++];
 780                         tri->mesh = mesh;
 781                         tri->index[0] = *index++;
 782                         tri->index[1] = *index++;
 783                         tri->index[2] = *index++;
 784                 }
 785         }
 786
 787         // map farclip to 0-4095 list range
 788         centerscaler = (TRANSDEPTHRES / r_farclip) * (1.0f / 3.0f);
 789         viewdistcompare = viewdist + 4.0f;
 790
 791         memset(buf_sorttranstri_list, 0, TRANSDEPTHRES * sizeof(buf_transtri_t *));
 792
 793         k = 0;
 794         for (j = 0;j < currenttranstriangle;j++)
 795         {
 796                 tri = &buf_sorttranstri[j];
 797                 i = tri->mesh->firstvert;
 798
 799                 vert1 = &buf_transvertex[tri->index[0] + i];
 800                 vert2 = &buf_transvertex[tri->index[1] + i];
 801                 vert3 = &buf_transvertex[tri->index[2] + i];
 802
 803                 dist1 = DotProduct(vert1->v, vpn);
 804                 dist2 = DotProduct(vert2->v, vpn);
 805                 dist3 = DotProduct(vert3->v, vpn);
 806
 807                 maxdist = max(dist1, max(dist2, dist3));
 808                 if (maxdist < viewdistcompare)
 809                         continue;
 810
 811                 center = (dist1 + dist2 + dist3) * centerscaler - viewdist;
 812 #if SLOWMATH
 813                 i = (int) center;
 814                 i = bound(0, i, (TRANSDEPTHRES - 1));
 815 #else
 816                 if (center < 0.0f)
 817                         center = 0.0f;
 818                 center += 8388608.0f;
 819                 i = *((long *)&center) & 0x7FFFFF;
 820                 i = min(i, (TRANSDEPTHRES - 1));
 821 #endif
 822                 tri->next = buf_sorttranstri_list[i];
 823                 buf_sorttranstri_list[i] = tri;
 824                 k++;
 825         }
 826
 827         for (i = 0;i < currenttransmesh;i++)
 828                 buf_transmesh[i].transchain = NULL;
 829         transmesh = NULL;
 830         for (j = 0;j < TRANSDEPTHRES;j++)
 831         {
 832                 if ((tri = buf_sorttranstri_list[j]))
 833                 {
 834                         for (;tri;tri = tri->next)
 835                         {
 836                                 if (!tri->mesh->transchain)
 837                                 {
 838                                         tri->mesh->chain = transmesh;
 839                                         transmesh = tri->mesh;
 840                                 }
 841                                 tri->meshsortchain = tri->mesh->transchain;
 842                                 tri->mesh->transchain = tri;
 843                         }
 844                 }
 845         }
 846
 847         for (;transmesh;transmesh = transmesh->chain)
 848         {
 849                 if (currentmesh >= max_meshs || currenttriangle + transmesh->triangles > max_batch || currentvertex + transmesh->verts > max_verts)
 850                         R_Mesh_Render();
 851
 852                 mesh = &buf_mesh[currentmesh++];
 853                 *mesh = *transmesh; // copy mesh properties
 854
 855                 mesh->firstvert = currentvertex;
 856                 memcpy(&buf_vertex[currentvertex], &buf_transvertex[transmesh->firstvert], transmesh->verts * sizeof(buf_vertex_t));
 857                 memcpy(&buf_fcolor[currentvertex], &buf_transfcolor[transmesh->firstvert], transmesh->verts * sizeof(buf_fcolor_t));
 858                 for (i = 0;i < backendunits && transmesh->textures[i];i++)
 859                         memcpy(&buf_texcoord[i][currentvertex], &buf_transtexcoord[i][transmesh->firstvert], transmesh->verts * sizeof(buf_texcoord_t));
 860                 currentvertex += mesh->verts;
 861
 862                 mesh->firsttriangle = currenttriangle;
 863                 for (tri = transmesh->transchain;tri;tri = tri->meshsortchain)
 864                 {
 865                         buf_tri[currenttriangle].index[0] = tri->index[0];
 866                         buf_tri[currenttriangle].index[1] = tri->index[1];
 867                         buf_tri[currenttriangle].index[2] = tri->index[2];
 868                         currenttriangle++;
 869                 }
 870                 mesh->triangles = currenttriangle - mesh->firsttriangle;
 871         }
 872
 873         currenttransmesh = 0;
 874         currenttranstriangle = 0;
 875         currenttransvertex = 0;
 876 }
 877
 878 void R_Mesh_Draw(const rmeshinfo_t *m)
 879 {
 880         // these are static because gcc runs out of virtual registers otherwise
 881         static int i, j, overbright, *index;
 882         static float *in, scaler;
 883         static float cr, cg, cb, ca;
 884         static buf_mesh_t *mesh;
 885         static buf_vertex_t *vert;
 886         static buf_fcolor_t *fcolor;
 887         static buf_texcoord_t *texcoord[MAX_TEXTUREUNITS];
 888
 889         if (!backendactive)
 890                 Sys_Error("R_Mesh_Draw: called when backend is not active\n");
 891
 892         if (m->index == NULL
 893          || !m->numtriangles
 894          || m->vertex == NULL
 895          || !m->numverts)
 896                 Host_Error("R_Mesh_Draw: no triangles or verts\n");
 897
 898         // ignore meaningless alpha meshs
 899         if (!m->depthwrite && m->blendfunc1 == GL_SRC_ALPHA && (m->blendfunc2 == GL_ONE || m->blendfunc2 == GL_ONE_MINUS_SRC_ALPHA))
 900         {
 901                 if (m->color)
 902                 {
 903                         for (i = 0, in = m->color + 3;i < m->numverts;i++, (int)in += m->colorstep)
 904                                 if (*in >= 0.01f)
 905                                         break;
 906                         if (i == m->numverts)
 907                                 return;
 908                 }
 909                 else if (m->ca < 0.01f)
 910                         return;
 911         }
 912
 913         if (!backendactive)
 914                 Sys_Error("R_Mesh_Draw: called when backend is not active\n");
 915
 916 #ifdef DEBUGGL
 917         for (i = 0;i < m->numtriangles * 3;i++)
 918                 if ((unsigned int) m->index[i] >= (unsigned int) m->numverts)
 919                         Host_Error("R_Mesh_Draw: invalid index (%i of %i verts)\n", m->index, m->numverts);
 920 #endif
 921
 922         if (m->transparent)
 923         {
 924                 if (currenttransmesh >= max_meshs || (currenttranstriangle + m->numtriangles) > max_meshs || (currenttransvertex + m->numverts) > max_verts)
 925                 {
 926                         if (!transranout)
 927                         {
 928                                 Con_Printf("R_Mesh_Draw: ran out of room for transparent meshs\n");
 929                                 transranout = true;
 930                         }
 931                         return;
 932                 }
 933
 934                 c_transmeshs++;
 935                 c_transtris += m->numtriangles;
 936                 vert = &buf_transvertex[currenttransvertex];
 937                 fcolor = &buf_transfcolor[currenttransvertex];
 938                 for (i = 0;i < backendunits;i++)
 939                         texcoord[i] = &buf_transtexcoord[i][currenttransvertex];
 940
 941                 // transmesh is only for storage of transparent meshs until they
 942                 // are inserted into the main mesh array
 943                 mesh = &buf_transmesh[currenttransmesh++];
 944                 mesh->firsttriangle = currenttranstriangle;
 945                 mesh->firstvert = currenttransvertex;
 946                 index = &buf_transtri[currenttranstriangle].index[0];
 947
 948                 currenttranstriangle += m->numtriangles;
 949                 currenttransvertex += m->numverts;
 950         }
 951         else
 952         {
 953                 if (m->numtriangles > max_meshs || m->numverts > max_verts)
 954                 {
 955                         Con_Printf("R_Mesh_Draw: mesh too big for buffers\n");
 956                         return;
 957                 }
 958
 959                 if (currentmesh >= max_meshs || (currenttriangle + m->numtriangles) > max_batch || (currentvertex + m->numverts) > max_verts)
 960                         R_Mesh_Render();
 961
 962                 c_meshs++;
 963                 c_meshtris += m->numtriangles;
 964                 vert = &buf_vertex[currentvertex];
 965                 fcolor = &buf_fcolor[currentvertex];
 966                 for (i = 0;i < backendunits;i++)
 967                         texcoord[i] = &buf_texcoord[i][currentvertex];
 968
 969                 // opaque meshs are rendered directly
 970                 mesh = &buf_mesh[currentmesh++];
 971                 mesh->firsttriangle = currenttriangle;
 972                 mesh->firstvert = currentvertex;
 973                 index = &buf_tri[currenttriangle].index[0];
 974
 975                 currenttriangle += m->numtriangles;
 976                 currentvertex += m->numverts;
 977         }
 978
 979         // code shared for transparent and opaque meshs
 980         memcpy(index, m->index, sizeof(int[3]) * m->numtriangles);
 981         mesh->blendfunc1 = m->blendfunc1;
 982         mesh->blendfunc2 = m->blendfunc2;
 983         mesh->depthmask = (m->blendfunc2 == GL_ZERO || m->depthwrite);
 984         mesh->depthtest = !m->depthdisable;
 985         mesh->triangles = m->numtriangles;
 986         mesh->verts = m->numverts;
 987
 988         overbright = false;
 989         scaler = 1;
 990         if (m->blendfunc2 == GL_SRC_COLOR)
 991         {
 992                 if (m->blendfunc1 == GL_DST_COLOR) // 2x modulate with framebuffer
 993                         scaler *= 0.5f;
 994         }
 995         else
 996         {
 997                 if (m->tex[0])
 998                 {
 999                         overbright = gl_combine.integer;
1000                         if (overbright)
1001                                 scaler *= 0.25f;
1002                 }
1003                 scaler *= overbrightscale;
1004         }
1005
1006
1007         j = -1;
1008         for (i = 0;i < backendunits;i++)
1009         {
1010                 if ((mesh->textures[i] = m->tex[i]))
1011                         j = i;
1012                 mesh->texturergbscale[i] = m->texrgbscale[i];
1013                 if (mesh->texturergbscale[i] != 1 && mesh->texturergbscale[i] != 2 && mesh->texturergbscale[i] != 4)
1014                         mesh->texturergbscale[i] = 1;
1015         }
1016         if (overbright && j >= 0)
1017                 mesh->texturergbscale[j] = 4;
1018
1019         if (m->vertexstep != sizeof(buf_vertex_t))
1020         {
1021                 for (i = 0, in = m->vertex;i < m->numverts;i++, (int)in += m->vertexstep)
1022                 {
1023                         vert[i].v[0] = in[0];
1024                         vert[i].v[1] = in[1];
1025                         vert[i].v[2] = in[2];
1026                 }
1027         }
1028         else
1029                 memcpy(vert, m->vertex, m->numverts * sizeof(buf_vertex_t));
1030
1031         if (m->color)
1032         {
1033                 for (i = 0, in = m->color;i < m->numverts;i++, (int)in += m->colorstep)
1034                 {
1035                         fcolor[i].c[0] = in[0] * scaler;
1036                         fcolor[i].c[1] = in[1] * scaler;
1037                         fcolor[i].c[2] = in[2] * scaler;
1038                         fcolor[i].c[3] = in[3];
1039                 }
1040         }
1041         else
1042         {
1043                 cr = m->cr * scaler;
1044                 cg = m->cg * scaler;
1045                 cb = m->cb * scaler;
1046                 ca = m->ca;
1047                 for (i = 0;i < m->numverts;i++)
1048                 {
1049                         fcolor[i].c[0] = cr;
1050                         fcolor[i].c[1] = cg;
1051                         fcolor[i].c[2] = cb;
1052                         fcolor[i].c[3] = ca;
1053                 }
1054         }
1055
1056         for (j = 0;j < MAX_TEXTUREUNITS && m->tex[j];j++)
1057         {
1058                 if (j >= backendunits)
1059                         Sys_Error("R_Mesh_Draw: texture %i supplied when there are only %i texture units\n", j + 1, backendunits);
1060                 if (m->texcoordstep[j] != sizeof(buf_texcoord_t))
1061                 {
1062                         for (i = 0, in = m->texcoords[j];i < m->numverts;i++, (int)in += m->texcoordstep[j])
1063                         {
1064                                 texcoord[j][i].t[0] = in[0];
1065                                 texcoord[j][i].t[1] = in[1];
1066                         }
1067                 }
1068                 else
1069                         memcpy(&texcoord[j][0].t[0], m->texcoords[j], m->numverts * sizeof(buf_texcoord_t));
1070         }
1071         #if 0
1072         for (;j < backendunits;j++)
1073                 memset(&texcoord[j][0].t[0], 0, m->numverts * sizeof(buf_texcoord_t));
1074         #endif
1075 }
1076
1077 void R_Mesh_Draw_NativeOnly(const rmeshinfo_t *m)
1078 {
1079         // these are static because gcc runs out of virtual registers otherwise
1080         static int i, j, overbright, *index;
1081         static float *in, scaler;
1082         static buf_mesh_t *mesh;
1083         static buf_vertex_t *vert;
1084         static buf_fcolor_t *fcolor;
1085         static buf_texcoord_t *texcoord[MAX_TEXTUREUNITS];
1086
1087         if (!backendactive)
1088                 Sys_Error("R_Mesh_Draw: called when backend is not active\n");
1089
1090         if (m->index == NULL
1091          || !m->numtriangles
1092          || m->vertex == NULL
1093          || !m->numverts)
1094                 Host_Error("R_Mesh_Draw: no triangles or verts\n");
1095
1096         // ignore meaningless alpha meshs
1097         if (!m->depthwrite && m->blendfunc1 == GL_SRC_ALPHA && (m->blendfunc2 == GL_ONE || m->blendfunc2 == GL_ONE_MINUS_SRC_ALPHA))
1098         {
1099                 if (m->color)
1100                 {
1101                         for (i = 0, in = m->color + 3;i < m->numverts;i++, (int)in += m->colorstep)
1102                                 if (*in >= 0.01f)
1103                                         break;
1104                         if (i == m->numverts)
1105                                 return;
1106                 }
1107                 else if (m->ca < 0.01f)
1108                         return;
1109         }
1110
1111         if (m->transparent)
1112         {
1113                 if (currenttransmesh >= max_meshs || (currenttranstriangle + m->numtriangles) > max_meshs || (currenttransvertex + m->numverts) > max_verts)
1114                 {
1115                         if (!transranout)
1116                         {
1117                                 Con_Printf("R_Mesh_Draw_NativeOnly: 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                 currenttranstriangle += m->numtriangles;
1137                 currenttransvertex += m->numverts;
1138         }
1139         else
1140         {
1141                 if (m->numtriangles > max_meshs || m->numverts > max_verts)
1142                 {
1143                         Con_Printf("R_Mesh_Draw_NativeOnly: mesh too big for buffers\n");
1144                         return;
1145                 }
1146
1147                 if (currentmesh >= max_meshs || (currenttriangle + m->numtriangles) > max_batch || (currentvertex + m->numverts) > max_verts)
1148                         R_Mesh_Render();
1149
1150                 c_meshs++;
1151                 c_meshtris += m->numtriangles;
1152                 vert = &buf_vertex[currentvertex];
1153                 fcolor = &buf_fcolor[currentvertex];
1154                 for (i = 0;i < backendunits;i++)
1155                         texcoord[i] = &buf_texcoord[i][currentvertex];
1156
1157                 // opaque meshs are rendered directly
1158                 mesh = &buf_mesh[currentmesh++];
1159                 mesh->firsttriangle = currenttriangle;
1160                 mesh->firstvert = currentvertex;
1161                 index = &buf_tri[currenttriangle].index[0];
1162                 currenttriangle += m->numtriangles;
1163                 currentvertex += m->numverts;
1164         }
1165
1166         // code shared for transparent and opaque meshs
1167         memcpy(index, m->index, sizeof(int[3]) * m->numtriangles);
1168         mesh->blendfunc1 = m->blendfunc1;
1169         mesh->blendfunc2 = m->blendfunc2;
1170         mesh->depthmask = (m->blendfunc2 == GL_ZERO || m->depthwrite);
1171         mesh->depthtest = !m->depthdisable;
1172         mesh->triangles = m->numtriangles;
1173         mesh->verts = m->numverts;
1174
1175         overbright = false;
1176         scaler = 1;
1177         if (m->blendfunc2 == GL_SRC_COLOR)
1178         {
1179                 if (m->blendfunc1 == GL_DST_COLOR) // 2x modulate with framebuffer
1180                         scaler *= 0.5f;
1181         }
1182         else
1183         {
1184                 if (m->tex[0])
1185                 {
1186                         overbright = gl_combine.integer;
1187                         if (overbright)
1188                                 scaler *= 0.25f;
1189                 }
1190                 scaler *= overbrightscale;
1191         }
1192
1193         j = -1;
1194         for (i = 0;i < backendunits;i++)
1195         {
1196                 if ((mesh->textures[i] = m->tex[i]))
1197                         j = i;
1198                 mesh->texturergbscale[i] = m->texrgbscale[i];
1199                 if (mesh->texturergbscale[i] != 1 && mesh->texturergbscale[i] != 2 && mesh->texturergbscale[i] != 4)
1200                         mesh->texturergbscale[i] = 1;
1201         }
1202         if (overbright && j >= 0)
1203                 mesh->texturergbscale[j] = 4;
1204
1205         if (m->vertexstep != sizeof(buf_vertex_t))
1206                 Host_Error("R_Mesh_Draw_NativeOnly: unsupported vertexstep\n");
1207         if (m->colorstep != sizeof(buf_fcolor_t))
1208                 Host_Error("R_Mesh_Draw_NativeOnly: unsupported colorstep\n");
1209         if (m->color == NULL)
1210                 Host_Error("R_Mesh_Draw_NativeOnly: must provide color array\n");
1211         for (j = 0;j < MAX_TEXTUREUNITS && m->tex[j];j++)
1212         {
1213                 if (j >= backendunits)
1214                         Sys_Error("R_Mesh_Draw_NativeOnly: texture %i supplied when there are only %i texture units\n", j + 1, backendunits);
1215                 if (m->texcoordstep[j] != sizeof(buf_texcoord_t))
1216                         Host_Error("R_Mesh_Draw_NativeOnly: unsupported texcoordstep\n");
1217         }
1218
1219         memcpy(vert, m->vertex, m->numverts * sizeof(buf_vertex_t));
1220         for (j = 0;j < MAX_TEXTUREUNITS && m->tex[j];j++)
1221                 memcpy(&texcoord[j][0].t[0], m->texcoords[j], m->numverts * sizeof(buf_texcoord_t));
1222         #if 0
1223         for (;j < backendunits;j++)
1224                 memset(&texcoord[j][0].t[0], 0, m->numverts * sizeof(buf_texcoord_t));
1225         #endif
1226
1227         memcpy(fcolor, m->color, m->numverts * sizeof(buf_fcolor_t));
1228
1229         // do this as a second step because memcpy preloaded the cache, which we can't easily do
1230         if (scaler != 1)
1231         {
1232                 for (i = 0;i < m->numverts;i++)
1233                 {
1234                         fcolor[i].c[0] *= scaler;
1235                         fcolor[i].c[1] *= scaler;
1236                         fcolor[i].c[2] *= scaler;
1237                 }
1238         }
1239 }
1240
1241 // allocates space in geometry buffers, and fills in pointers to the buffers in passsed struct
1242 // (this is used for very high speed rendering, no copying)
1243 int R_Mesh_Draw_GetBuffer(rmeshbufferinfo_t *m)
1244 {
1245         // these are static because gcc runs out of virtual registers otherwise
1246         int i, j, overbright;
1247         float scaler;
1248         buf_mesh_t *mesh;
1249
1250         if (!backendactive)
1251                 Sys_Error("R_Mesh_Draw: called when backend is not active\n");
1252
1253         if (!m->numtriangles
1254          || !m->numverts)
1255                 Host_Error("R_Mesh_Draw: no triangles or verts\n");
1256
1257         if (m->transparent)
1258         {
1259                 if (currenttransmesh >= max_meshs || (currenttranstriangle + m->numtriangles) > max_meshs || (currenttransvertex + m->numverts) > max_verts)
1260                 {
1261                         if (!transranout)
1262                         {
1263                                 Con_Printf("R_Mesh_Draw: ran out of room for transparent meshs\n");
1264                                 transranout = true;
1265                         }
1266                         return false;
1267                 }
1268
1269                 c_transmeshs++;
1270                 c_transtris += m->numtriangles;
1271                 m->index = &buf_transtri[currenttranstriangle].index[0];
1272                 m->vertex = &buf_transvertex[currenttransvertex].v[0];
1273                 m->color = &buf_transfcolor[currenttransvertex].c[0];
1274                 for (i = 0;i < backendunits;i++)
1275                         m->texcoords[i] = &buf_transtexcoord[i][currenttransvertex].t[0];
1276
1277                 // transmesh is only for storage of transparent meshs until they
1278                 // are inserted into the main mesh array
1279                 mesh = &buf_transmesh[currenttransmesh++];
1280                 mesh->firsttriangle = currenttranstriangle;
1281                 mesh->firstvert = currenttransvertex;
1282                 currenttranstriangle += m->numtriangles;
1283                 currenttransvertex += m->numverts;
1284         }
1285         else
1286         {
1287                 if (m->numtriangles > max_meshs || m->numverts > max_verts)
1288                 {
1289                         Con_Printf("R_Mesh_Draw_GetBuffer: mesh too big for buffers\n");
1290                         return false;
1291                 }
1292
1293                 if (currentmesh >= max_meshs || (currenttriangle + m->numtriangles) > max_batch || (currentvertex + m->numverts) > max_verts)
1294                         R_Mesh_Render();
1295
1296                 c_meshs++;
1297                 c_meshtris += m->numtriangles;
1298                 m->index = &buf_tri[currenttriangle].index[0];
1299                 m->vertex = &buf_vertex[currentvertex].v[0];
1300                 m->color = &buf_fcolor[currentvertex].c[0];
1301                 for (i = 0;i < backendunits;i++)
1302                         m->texcoords[i] = &buf_texcoord[i][currentvertex].t[0];
1303
1304                 // opaque meshs are rendered directly
1305                 mesh = &buf_mesh[currentmesh++];
1306                 mesh->firsttriangle = currenttriangle;
1307                 mesh->firstvert = currentvertex;
1308                 currenttriangle += m->numtriangles;
1309                 currentvertex += m->numverts;
1310         }
1311
1312         // code shared for transparent and opaque meshs
1313         mesh->blendfunc1 = m->blendfunc1;
1314         mesh->blendfunc2 = m->blendfunc2;
1315         mesh->depthmask = (m->blendfunc2 == GL_ZERO || m->depthwrite);
1316         mesh->depthtest = !m->depthdisable;
1317         mesh->triangles = m->numtriangles;
1318         mesh->verts = m->numverts;
1319
1320         overbright = false;
1321         scaler = 1;
1322         if (m->blendfunc2 == GL_SRC_COLOR)
1323         {
1324                 if (m->blendfunc1 == GL_DST_COLOR) // 2x modulate with framebuffer
1325                         scaler *= 0.5f;
1326         }
1327         else
1328         {
1329                 if (m->tex[0])
1330                 {
1331                         overbright = gl_combine.integer;
1332                         if (overbright)
1333                                 scaler *= 0.25f;
1334                 }
1335                 scaler *= overbrightscale;
1336         }
1337         m->colorscale = scaler;
1338
1339         j = -1;
1340         for (i = 0;i < MAX_TEXTUREUNITS;i++)
1341         {
1342                 if ((mesh->textures[i] = m->tex[i]))
1343                 {
1344                         j = i;
1345                         if (i >= backendunits)
1346                                 Sys_Error("R_Mesh_Draw_GetBuffer: texture %i supplied when there are only %i texture units\n", j + 1, backendunits);
1347                 }
1348                 mesh->texturergbscale[i] = m->texrgbscale[i];
1349                 if (mesh->texturergbscale[i] != 1 && mesh->texturergbscale[i] != 2 && mesh->texturergbscale[i] != 4)
1350                         mesh->texturergbscale[i] = 1;
1351         }
1352         if (overbright && j >= 0)
1353                 mesh->texturergbscale[j] = 4;
1354
1355         return true;
1356 }
1357
1358 void R_Mesh_DrawPolygon(rmeshinfo_t *m, int numverts)
1359 {
1360         m->index = polyindexarray;
1361         m->numverts = numverts;
1362         m->numtriangles = numverts - 2;
1363         if (m->numtriangles < 1)
1364         {
1365                 Con_Printf("R_Mesh_DrawPolygon: invalid vertex count\n");
1366                 return;
1367         }
1368         if (m->numtriangles >= 256)
1369         {
1370                 Con_Printf("R_Mesh_DrawPolygon: only up to 256 triangles (258 verts) supported\n");
1371                 return;
1372         }
1373         R_Mesh_Draw(m);
1374 }
1375
1376 /*
1377 ==============================================================================
1378
1379                                                 SCREEN SHOTS
1380
1381 ==============================================================================
1382 */
1383
1384 void SCR_ScreenShot(char *filename, int x, int y, int width, int height)
1385 {
1386         int i;
1387         qbyte *buffer;
1388
1389         if (!r_render.integer)
1390                 return;
1391
1392         buffer = Mem_Alloc(tempmempool, width*height*3);
1393         glReadPixels (x, y, width, height, GL_RGB, GL_UNSIGNED_BYTE, buffer);
1394         CHECKGLERROR
1395
1396         // LordHavoc: compensate for v_overbrightbits when using hardware gamma
1397         if (v_hwgamma.integer)
1398                 for (i = 0;i < width * height * 3;i++)
1399                         buffer[i] <<= v_overbrightbits.integer;
1400
1401         Image_WriteTGARGB_preflipped(filename, width, height, buffer);
1402
1403         Mem_Free(buffer);
1404 }
1405
1406 //=============================================================================
1407
1408 void R_ClearScreen(void)
1409 {
1410         if (r_render.integer)
1411         {
1412                 // clear to black
1413                 glClearColor(0,0,0,0);CHECKGLERROR
1414                 // clear the screen
1415                 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);CHECKGLERROR
1416                 // set dithering mode
1417                 if (gl_dither.integer)
1418                 {
1419                         glEnable(GL_DITHER);CHECKGLERROR
1420                 }
1421                 else
1422                 {
1423                         glDisable(GL_DITHER);CHECKGLERROR
1424                 }
1425         }
1426 }
1427
1428 /*
1429 ==================
1430 SCR_UpdateScreen
1431
1432 This is called every frame, and can also be called explicitly to flush
1433 text to the screen.
1434 ==================
1435 */
1436 void SCR_UpdateScreen (void)
1437 {
1438         //Mem_CheckSentinelsGlobal();
1439         //R_TimeReport("memtest");
1440
1441         VID_Finish ();
1442
1443         R_TimeReport("finish");
1444
1445         if (gl_combine.integer && !gl_combine_extension)
1446                 Cvar_SetValue("gl_combine", 0);
1447
1448         lightscalebit = v_overbrightbits.integer;
1449         if (gl_combine.integer && r_multitexture.integer)
1450                 lightscalebit += 2;
1451
1452         lightscale = 1.0f / (float) (1 << lightscalebit);
1453         overbrightscale = 1.0f / (float) (1 << v_overbrightbits.integer);
1454
1455         R_TimeReport("setup");
1456
1457         R_ClearScreen();
1458
1459         R_TimeReport("clear");
1460
1461         if (scr_conlines < vid.conheight)
1462                 R_RenderView();
1463
1464         // draw 2D stuff
1465         R_DrawQueue();
1466
1467         // tell driver to commit it's partially full geometry queue to the rendering queue
1468         // (this doesn't wait for the commands themselves to complete)
1469         glFlush();
1470 }