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