gl_rmain.c

   1 /*
   2 Copyright (C) 1996-1997 Id Software, Inc.
   3
   4 This program is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU General Public License
   6 as published by the Free Software Foundation; either version 2
   7 of the License, or (at your option) any later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  12
  13 See the GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  18
  19 */
  20 // r_main.c
  21
  22 #include "quakedef.h"
  23
  24 entity_render_t *currentrenderentity;
  25
  26 // used for dlight push checking and other things
  27 int r_framecount;
  28
  29 mplane_t frustum[4];
  30
  31 int c_brush_polys, c_alias_polys, c_light_polys, c_faces, c_nodes, c_leafs, c_models, c_bmodels, c_sprites, c_particles, c_dlights;
  32
  33 // true during envmap command capture
  34 qboolean envmap;
  35
  36 float r_farclip;
  37
  38 // view origin
  39 vec3_t r_origin;
  40 vec3_t vpn;
  41 vec3_t vright;
  42 vec3_t vup;
  43
  44 //
  45 // screen size info
  46 //
  47 refdef_t r_refdef;
  48
  49 mleaf_t *r_viewleaf, *r_oldviewleaf;
  50
  51 // 8.8 fraction of base light value
  52 unsigned short d_lightstylevalue[256];
  53
  54 cvar_t r_drawentities = {0, "r_drawentities","1"};
  55 cvar_t r_drawviewmodel = {0, "r_drawviewmodel","1"};
  56 cvar_t r_speeds = {0, "r_speeds","0"};
  57 cvar_t r_fullbright = {0, "r_fullbright","0"};
  58 cvar_t r_wateralpha = {CVAR_SAVE, "r_wateralpha","1"};
  59 cvar_t r_dynamic = {CVAR_SAVE, "r_dynamic","1"};
  60 cvar_t r_fullbrights = {CVAR_SAVE, "r_fullbrights", "1"};
  61
  62 cvar_t gl_fogenable = {0, "gl_fogenable", "0"};
  63 cvar_t gl_fogdensity = {0, "gl_fogdensity", "0.25"};
  64 cvar_t gl_fogred = {0, "gl_fogred","0.3"};
  65 cvar_t gl_foggreen = {0, "gl_foggreen","0.3"};
  66 cvar_t gl_fogblue = {0, "gl_fogblue","0.3"};
  67 cvar_t gl_fogstart = {0, "gl_fogstart", "0"};
  68 cvar_t gl_fogend = {0, "gl_fogend","0"};
  69
  70 cvar_t r_textureunits = {0, "r_textureunits", "32"};
  71
  72 /*
  73 ====================
  74 R_TimeRefresh_f
  75
  76 For program optimization
  77 ====================
  78 */
  79 qboolean intimerefresh = 0;
  80 static void R_TimeRefresh_f (void)
  81 {
  82         int i;
  83         float start, stop, time;
  84
  85         intimerefresh = 1;
  86         start = Sys_DoubleTime ();
  87         for (i = 0;i < 128;i++)
  88         {
  89                 r_refdef.viewangles[0] = 0;
  90                 r_refdef.viewangles[1] = i/128.0*360.0;
  91                 r_refdef.viewangles[2] = 0;
  92                 CL_UpdateScreen();
  93         }
  94
  95         stop = Sys_DoubleTime ();
  96         intimerefresh = 0;
  97         time = stop-start;
  98         Con_Printf ("%f seconds (%f fps)\n", time, 128/time);
  99 }
 100
 101 extern cvar_t r_drawportals;
 102
 103 int R_VisibleCullBox (vec3_t mins, vec3_t maxs)
 104 {
 105         int sides;
 106         mnode_t *nodestack[8192], *node;
 107         int stack = 0;
 108
 109         if (R_CullBox(mins, maxs))
 110                 return true;
 111
 112         node = cl.worldmodel->nodes;
 113 loc0:
 114         if (node->contents < 0)
 115         {
 116                 if (((mleaf_t *)node)->visframe == r_framecount)
 117                         return false;
 118                 if (!stack)
 119                         return true;
 120                 node = nodestack[--stack];
 121                 goto loc0;
 122         }
 123
 124         sides = BOX_ON_PLANE_SIDE(mins, maxs, node->plane);
 125
 126 // recurse down the contacted sides
 127         if (sides & 1)
 128         {
 129                 if (sides & 2) // 3
 130                 {
 131                         // put second child on the stack for later examination
 132                         nodestack[stack++] = node->children[1];
 133                         node = node->children[0];
 134                         goto loc0;
 135                 }
 136                 else // 1
 137                 {
 138                         node = node->children[0];
 139                         goto loc0;
 140                 }
 141         }
 142         // 2
 143         node = node->children[1];
 144         goto loc0;
 145 }
 146
 147 vec3_t fogcolor;
 148 vec_t fogdensity;
 149 float fog_density, fog_red, fog_green, fog_blue;
 150 qboolean fogenabled;
 151 qboolean oldgl_fogenable;
 152 void R_SetupFog(void)
 153 {
 154         if (gamemode == GAME_NEHAHRA)
 155         {
 156                 if (gl_fogenable.integer)
 157                 {
 158                         oldgl_fogenable = true;
 159                         fog_density = gl_fogdensity.value;
 160                         fog_red = gl_fogred.value;
 161                         fog_green = gl_foggreen.value;
 162                         fog_blue = gl_fogblue.value;
 163                 }
 164                 else if (oldgl_fogenable)
 165                 {
 166                         oldgl_fogenable = false;
 167                         fog_density = 0;
 168                         fog_red = 0;
 169                         fog_green = 0;
 170                         fog_blue = 0;
 171                 }
 172         }
 173         if (fog_density)
 174         {
 175                 fogcolor[0] = fog_red   = bound(0.0f, fog_red  , 1.0f);
 176                 fogcolor[1] = fog_green = bound(0.0f, fog_green, 1.0f);
 177                 fogcolor[2] = fog_blue  = bound(0.0f, fog_blue , 1.0f);
 178         }
 179         if (fog_density)
 180         {
 181                 fogenabled = true;
 182                 fogdensity = -4000.0f / (fog_density * fog_density);
 183                 // fog color was already set
 184         }
 185         else
 186                 fogenabled = false;
 187 }
 188
 189 // FIXME: move this to client?
 190 void FOG_clear(void)
 191 {
 192         if (gamemode == GAME_NEHAHRA)
 193         {
 194                 Cvar_Set("gl_fogenable", "0");
 195                 Cvar_Set("gl_fogdensity", "0.2");
 196                 Cvar_Set("gl_fogred", "0.3");
 197                 Cvar_Set("gl_foggreen", "0.3");
 198                 Cvar_Set("gl_fogblue", "0.3");
 199         }
 200         fog_density = fog_red = fog_green = fog_blue = 0.0f;
 201 }
 202
 203 // FIXME: move this to client?
 204 void FOG_registercvars(void)
 205 {
 206         if (gamemode == GAME_NEHAHRA)
 207         {
 208                 Cvar_RegisterVariable (&gl_fogenable);
 209                 Cvar_RegisterVariable (&gl_fogdensity);
 210                 Cvar_RegisterVariable (&gl_fogred);
 211                 Cvar_RegisterVariable (&gl_foggreen);
 212                 Cvar_RegisterVariable (&gl_fogblue);
 213                 Cvar_RegisterVariable (&gl_fogstart);
 214                 Cvar_RegisterVariable (&gl_fogend);
 215         }
 216 }
 217
 218 void gl_main_start(void)
 219 {
 220 }
 221
 222 void gl_main_shutdown(void)
 223 {
 224 }
 225
 226 void gl_main_newmap(void)
 227 {
 228         r_framecount = 1;
 229 }
 230
 231 void GL_Main_Init(void)
 232 {
 233 // FIXME: move this to client?
 234         FOG_registercvars();
 235         Cmd_AddCommand ("timerefresh", R_TimeRefresh_f);
 236         Cvar_RegisterVariable (&r_drawentities);
 237         Cvar_RegisterVariable (&r_drawviewmodel);
 238         Cvar_RegisterVariable (&r_speeds);
 239         Cvar_RegisterVariable (&r_fullbrights);
 240         Cvar_RegisterVariable (&r_wateralpha);
 241         Cvar_RegisterVariable (&r_dynamic);
 242         Cvar_RegisterVariable (&r_fullbright);
 243         Cvar_RegisterVariable (&r_textureunits);
 244         if (gamemode == GAME_NEHAHRA)
 245                 Cvar_SetValue("r_fullbrights", 0);
 246         R_RegisterModule("GL_Main", gl_main_start, gl_main_shutdown, gl_main_newmap);
 247 }
 248
 249 vec3_t r_farclip_origin;
 250 vec3_t r_farclip_direction;
 251 vec_t r_farclip_directiondist;
 252 vec_t r_farclip_meshfarclip;
 253 int r_farclip_directionbit0;
 254 int r_farclip_directionbit1;
 255 int r_farclip_directionbit2;
 256
 257 // start a farclip measuring session
 258 void R_FarClip_Start(vec3_t origin, vec3_t direction, vec_t startfarclip)
 259 {
 260         VectorCopy(origin, r_farclip_origin);
 261         VectorCopy(direction, r_farclip_direction);
 262         r_farclip_directiondist = DotProduct(r_farclip_origin, r_farclip_direction);
 263         r_farclip_directionbit0 = r_farclip_direction[0] < 0;
 264         r_farclip_directionbit1 = r_farclip_direction[1] < 0;
 265         r_farclip_directionbit2 = r_farclip_direction[2] < 0;
 266         r_farclip_meshfarclip = r_farclip_directiondist + startfarclip;
 267 }
 268
 269 // enlarge farclip to accomodate box
 270 void R_FarClip_Box(vec3_t mins, vec3_t maxs)
 271 {
 272         float d;
 273         d = (r_farclip_directionbit0 ? mins[0] : maxs[0]) * r_farclip_direction[0]
 274           + (r_farclip_directionbit1 ? mins[1] : maxs[1]) * r_farclip_direction[1]
 275           + (r_farclip_directionbit2 ? mins[2] : maxs[2]) * r_farclip_direction[2];
 276         if (r_farclip_meshfarclip < d)
 277                 r_farclip_meshfarclip = d;
 278 }
 279
 280 // return farclip value
 281 float R_FarClip_Finish(void)
 282 {
 283         return r_farclip_meshfarclip - r_farclip_directiondist;
 284 }
 285
 286 /*
 287 ===============
 288 R_NewMap
 289 ===============
 290 */
 291 void CL_ParseEntityLump(char *entitystring);
 292 void R_NewMap (void)
 293 {
 294         int i;
 295
 296         for (i = 0;i < 256;i++)
 297                 d_lightstylevalue[i] = 264;             // normal light value
 298
 299         r_viewleaf = NULL;
 300         if (cl.worldmodel->entities)
 301                 CL_ParseEntityLump(cl.worldmodel->entities);
 302         R_Modules_NewMap();
 303
 304         r_farclip = 64.0f;
 305 }
 306
 307 extern void R_Textures_Init(void);
 308 extern void Mod_RenderInit(void);
 309 extern void GL_Draw_Init(void);
 310 extern void GL_Main_Init(void);
 311 extern void GL_Models_Init(void);
 312 extern void R_Sky_Init(void);
 313 extern void GL_Surf_Init(void);
 314 extern void R_Crosshairs_Init(void);
 315 extern void R_Light_Init(void);
 316 extern void R_Particles_Init(void);
 317 extern void R_Explosion_Init(void);
 318 extern void ui_init(void);
 319 extern void gl_backend_init(void);
 320
 321 void Render_Init(void)
 322 {
 323         R_Modules_Shutdown();
 324         R_Textures_Init();
 325         Mod_RenderInit();
 326         gl_backend_init();
 327         GL_Draw_Init();
 328         GL_Main_Init();
 329         GL_Models_Init();
 330         R_Sky_Init();
 331         GL_Surf_Init();
 332         R_Crosshairs_Init();
 333         R_Light_Init();
 334         R_Particles_Init();
 335         R_Explosion_Init();
 336         ui_init();
 337         R_Modules_Start();
 338 }
 339
 340 /*
 341 ===============
 342 GL_Init
 343 ===============
 344 */
 345 extern char *ENGINE_EXTENSIONS;
 346 void GL_Init (void)
 347 {
 348         VID_CheckExtensions();
 349
 350         // LordHavoc: report supported extensions
 351         Con_Printf ("\nengine extensions: %s\n", ENGINE_EXTENSIONS);
 352
 353         qglCullFace(GL_FRONT);
 354         qglEnable(GL_TEXTURE_2D);
 355 }
 356
 357
 358 //==================================================================================
 359
 360 static void R_MarkEntities (void)
 361 {
 362         int i;
 363         vec3_t v;
 364
 365         R_FarClip_Box(cl.worldmodel->normalmins, cl.worldmodel->normalmaxs);
 366
 367         if (!r_drawentities.integer)
 368                 return;
 369
 370         for (i = 0;i < r_refdef.numentities;i++)
 371         {
 372                 currentrenderentity = r_refdef.entities[i];
 373                 Mod_CheckLoaded(currentrenderentity->model);
 374
 375                 // move view-relative models to where they should be
 376                 if (currentrenderentity->flags & RENDER_VIEWMODEL)
 377                 {
 378                         // remove flag so it will not be repeated incase RelinkEntities is not called again for a while
 379                         currentrenderentity->flags -= RENDER_VIEWMODEL;
 380                         // transform origin
 381                         VectorCopy(currentrenderentity->origin, v);
 382                         currentrenderentity->origin[0] = v[0] * vpn[0] + v[1] * vright[0] + v[2] * vup[0] + r_origin[0];
 383                         currentrenderentity->origin[1] = v[0] * vpn[1] + v[1] * vright[1] + v[2] * vup[1] + r_origin[1];
 384                         currentrenderentity->origin[2] = v[0] * vpn[2] + v[1] * vright[2] + v[2] * vup[2] + r_origin[2];
 385                         // adjust angles
 386                         VectorAdd(currentrenderentity->angles, r_refdef.viewangles, currentrenderentity->angles);
 387                 }
 388
 389                 if (currentrenderentity->angles[0] || currentrenderentity->angles[2])
 390                 {
 391                         VectorMA(currentrenderentity->origin, currentrenderentity->scale, currentrenderentity->model->rotatedmins, currentrenderentity->mins);
 392                         VectorMA(currentrenderentity->origin, currentrenderentity->scale, currentrenderentity->model->rotatedmaxs, currentrenderentity->maxs);
 393                 }
 394                 else if (currentrenderentity->angles[1])
 395                 {
 396                         VectorMA(currentrenderentity->origin, currentrenderentity->scale, currentrenderentity->model->yawmins, currentrenderentity->mins);
 397                         VectorMA(currentrenderentity->origin, currentrenderentity->scale, currentrenderentity->model->yawmaxs, currentrenderentity->maxs);
 398                 }
 399                 else
 400                 {
 401                         VectorMA(currentrenderentity->origin, currentrenderentity->scale, currentrenderentity->model->normalmins, currentrenderentity->mins);
 402                         VectorMA(currentrenderentity->origin, currentrenderentity->scale, currentrenderentity->model->normalmaxs, currentrenderentity->maxs);
 403                 }
 404                 if (R_VisibleCullBox(currentrenderentity->mins, currentrenderentity->maxs))
 405                         continue;
 406
 407                 R_LerpAnimation(currentrenderentity);
 408                 currentrenderentity->visframe = r_framecount;
 409
 410                 R_FarClip_Box(currentrenderentity->mins, currentrenderentity->maxs);
 411         }
 412 }
 413
 414 // only used if skyrendermasked, and normally returns false
 415 int R_DrawBModelSky (void)
 416 {
 417         int i, sky;
 418
 419         if (!r_drawentities.integer)
 420                 return false;
 421
 422         sky = false;
 423         for (i = 0;i < r_refdef.numentities;i++)
 424         {
 425                 currentrenderentity = r_refdef.entities[i];
 426                 if (currentrenderentity->visframe == r_framecount && currentrenderentity->model->DrawSky)
 427                 {
 428                         currentrenderentity->model->DrawSky();
 429                         sky = true;
 430                 }
 431         }
 432         return sky;
 433 }
 434
 435 void R_DrawModels (void)
 436 {
 437         int i;
 438
 439         if (!r_drawentities.integer)
 440                 return;
 441
 442         for (i = 0;i < r_refdef.numentities;i++)
 443         {
 444                 currentrenderentity = r_refdef.entities[i];
 445                 if (currentrenderentity->visframe == r_framecount && currentrenderentity->model->Draw)
 446                         currentrenderentity->model->Draw();
 447         }
 448 }
 449
 450 /*
 451 =============
 452 R_DrawViewModel
 453 =============
 454 */
 455 void R_DrawViewModel (void)
 456 {
 457         // FIXME: move these checks to client
 458         if (!r_drawviewmodel.integer || chase_active.integer || envmap || !r_drawentities.integer || cl.items & IT_INVISIBILITY || cl.stats[STAT_HEALTH] <= 0 || !cl.viewent.render.model)
 459                 return;
 460
 461         currentrenderentity = &cl.viewent.render;
 462         Mod_CheckLoaded(currentrenderentity->model);
 463
 464         R_LerpAnimation(currentrenderentity);
 465
 466         currentrenderentity->model->Draw();
 467 }
 468
 469 static void R_SetFrustum (void)
 470 {
 471         int i;
 472
 473         // LordHavoc: note to all quake engine coders, the special case for 90
 474         // degrees assumed a square view (wrong), so I removed it, Quake2 has it
 475         // disabled as well.
 476         // rotate VPN right by FOV_X/2 degrees
 477         RotatePointAroundVector( frustum[0].normal, vup, vpn, -(90-r_refdef.fov_x / 2 ) );
 478         // rotate VPN left by FOV_X/2 degrees
 479         RotatePointAroundVector( frustum[1].normal, vup, vpn, 90-r_refdef.fov_x / 2 );
 480         // rotate VPN up by FOV_X/2 degrees
 481         RotatePointAroundVector( frustum[2].normal, vright, vpn, 90-r_refdef.fov_y / 2 );
 482         // rotate VPN down by FOV_X/2 degrees
 483         RotatePointAroundVector( frustum[3].normal, vright, vpn, -( 90 - r_refdef.fov_y / 2 ) );
 484
 485         for (i = 0;i < 4;i++)
 486         {
 487                 frustum[i].type = PLANE_ANYZ;
 488                 frustum[i].dist = DotProduct (r_origin, frustum[i].normal);
 489                 PlaneClassify(&frustum[i]);
 490         }
 491 }
 492
 493 /*
 494 ===============
 495 R_SetupFrame
 496 ===============
 497 */
 498 static void R_SetupFrame (void)
 499 {
 500 // don't allow cheats in multiplayer
 501         if (cl.maxclients > 1)
 502         {
 503                 if (r_fullbright.integer != 0)
 504                         Cvar_Set ("r_fullbright", "0");
 505                 if (r_ambient.value != 0)
 506                         Cvar_Set ("r_ambient", "0");
 507         }
 508
 509         r_framecount++;
 510
 511 // build the transformation matrix for the given view angles
 512         VectorCopy (r_refdef.vieworg, r_origin);
 513
 514         AngleVectors (r_refdef.viewangles, vpn, vright, vup);
 515
 516 // current viewleaf
 517         r_oldviewleaf = r_viewleaf;
 518         r_viewleaf = Mod_PointInLeaf (r_origin, cl.worldmodel);
 519
 520         R_AnimateLight ();
 521 }
 522
 523
 524 static void R_BlendView(void)
 525 {
 526         rmeshbufferinfo_t m;
 527         float r;
 528
 529         if (r_refdef.viewblend[3] < 0.01f)
 530                 return;
 531
 532         memset(&m, 0, sizeof(m));
 533         m.transparent = false;
 534         m.blendfunc1 = GL_SRC_ALPHA;
 535         m.blendfunc2 = GL_ONE_MINUS_SRC_ALPHA;
 536         m.depthdisable = true; // magic
 537         m.numtriangles = 1;
 538         m.numverts = 3;
 539         if (R_Mesh_Draw_GetBuffer(&m, false))
 540         {
 541                 m.index[0] = 0;
 542                 m.index[1] = 1;
 543                 m.index[2] = 2;
 544                 m.color[0] = m.color[4] = m.color[8] = r_refdef.viewblend[0];
 545                 m.color[1] = m.color[5] = m.color[9] = r_refdef.viewblend[1];
 546                 m.color[2] = m.color[6] = m.color[10] = r_refdef.viewblend[2];
 547                 m.color[3] = m.color[7] = m.color[11] = r_refdef.viewblend[3];
 548                 r = 64000;
 549                 m.vertex[0] = r_origin[0] + vpn[0] * 1.5 - vright[0] * r - vup[0] * r;
 550                 m.vertex[1] = r_origin[1] + vpn[1] * 1.5 - vright[1] * r - vup[1] * r;
 551                 m.vertex[2] = r_origin[2] + vpn[2] * 1.5 - vright[2] * r - vup[2] * r;
 552                 r *= 3;
 553                 m.vertex[4] = m.vertex[0] + vup[0] * r;
 554                 m.vertex[5] = m.vertex[1] + vup[1] * r;
 555                 m.vertex[6] = m.vertex[2] + vup[2] * r;
 556                 m.vertex[8] = m.vertex[0] + vright[0] * r;
 557                 m.vertex[9] = m.vertex[1] + vright[1] * r;
 558                 m.vertex[10] = m.vertex[2] + vright[2] * r;
 559                 R_Mesh_Render();
 560         }
 561 }
 562
 563 /*
 564 ================
 565 R_RenderView
 566
 567 r_refdef must be set before the first call
 568 ================
 569 */
 570 void R_RenderView (void)
 571 {
 572         if (!cl.worldmodel)
 573                 return; //Host_Error ("R_RenderView: NULL worldmodel");
 574
 575         // FIXME: move to client
 576         R_MoveExplosions();
 577         R_TimeReport("mexplosion");
 578
 579         R_SetupFrame();
 580         R_SetFrustum();
 581         R_SetupFog();
 582         R_SkyStartFrame();
 583         R_BuildLightList();
 584
 585         R_FarClip_Start(r_origin, vpn, 768.0f);
 586
 587         R_TimeReport("setup");
 588
 589         R_DrawWorld();
 590         R_TimeReport("worldnode");
 591
 592         R_MarkEntities();
 593         R_TimeReport("markentity");
 594
 595         R_MarkWorldLights();
 596         R_TimeReport("marklights");
 597
 598         r_farclip = R_FarClip_Finish() + 256.0f;
 599
 600         R_Mesh_Start(r_farclip);
 601
 602         if (skyrendermasked)
 603         {
 604                 if (R_DrawBModelSky())
 605                         R_TimeReport("bmodelsky");
 606         }
 607         else
 608         {
 609                 R_DrawViewModel();
 610                 R_TimeReport("viewmodel");
 611         }
 612
 613         R_SetupForWorldRendering();
 614         R_PrepareSurfaces();
 615         R_TimeReport("surfprep");
 616
 617         R_DrawSurfaces(SHADERSTAGE_SKY);
 618         R_DrawSurfaces(SHADERSTAGE_NORMAL);
 619         R_TimeReport("surfdraw");
 620
 621         if (r_drawportals.integer)
 622         {
 623                 R_DrawPortals();
 624                 R_TimeReport("portals");
 625         }
 626
 627         // don't let sound skip if going slow
 628         if (!intimerefresh && !r_speeds.integer)
 629                 S_ExtraUpdate ();
 630
 631         if (skyrendermasked)
 632         {
 633                 R_DrawViewModel();
 634                 R_TimeReport("viewmodel");
 635         }
 636
 637         R_DrawModels();
 638         R_TimeReport("models");
 639
 640         R_DrawParticles();
 641         R_TimeReport("particles");
 642
 643         R_DrawExplosions();
 644         R_TimeReport("explosions");
 645
 646         // draw transparent meshs
 647         R_Mesh_AddTransparent();
 648         R_TimeReport("addtrans");
 649
 650         R_DrawCoronas();
 651         R_TimeReport("coronas");
 652
 653         R_BlendView();
 654         R_TimeReport("blendview");
 655
 656         R_DrawCrosshair();
 657         R_TimeReport("crosshair");
 658
 659         // render any queued meshs
 660         R_Mesh_Finish();
 661         R_TimeReport("meshfinish");
 662 }
 663