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 int                     r_framecount;           // used for dlight push checking
  27
  28 mplane_t        frustum[4];
  29
  30 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;
  31
  32 qboolean        envmap;                         // true during envmap command capture
  33
  34 //
  35 // view origin
  36 //
  37 vec3_t  vup;
  38 vec3_t  vpn;
  39 vec3_t  vright;
  40 vec3_t  r_origin;
  41
  42 //
  43 // screen size info
  44 //
  45 refdef_t        r_refdef;
  46
  47 mleaf_t         *r_viewleaf, *r_oldviewleaf;
  48
  49 unsigned short  d_lightstylevalue[256]; // 8.8 fraction of base light value
  50
  51 cvar_t  r_drawentities = {0, "r_drawentities","1"};
  52 cvar_t  r_drawviewmodel = {0, "r_drawviewmodel","1"};
  53 cvar_t  r_speeds = {0, "r_speeds","0"};
  54 cvar_t  r_fullbright = {0, "r_fullbright","0"};
  55 cvar_t  r_wateralpha = {CVAR_SAVE, "r_wateralpha","1"};
  56 cvar_t  r_dynamic = {CVAR_SAVE, "r_dynamic","1"};
  57 cvar_t  r_waterripple = {CVAR_SAVE, "r_waterripple","0"};
  58 cvar_t  r_fullbrights = {CVAR_SAVE, "r_fullbrights", "1"};
  59
  60 cvar_t  gl_fogenable = {0, "gl_fogenable", "0"};
  61 cvar_t  gl_fogdensity = {0, "gl_fogdensity", "0.25"};
  62 cvar_t  gl_fogred = {0, "gl_fogred","0.3"};
  63 cvar_t  gl_foggreen = {0, "gl_foggreen","0.3"};
  64 cvar_t  gl_fogblue = {0, "gl_fogblue","0.3"};
  65 cvar_t  gl_fogstart = {0, "gl_fogstart", "0"};
  66 cvar_t  gl_fogend = {0, "gl_fogend","0"};
  67
  68 cvar_t  r_ser = {CVAR_SAVE, "r_ser", "0"};
  69
  70 cvar_t r_multitexture = {0, "r_multitexture", "1"};
  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_waterripple);
 243         Cvar_RegisterVariable (&r_fullbright);
 244         Cvar_RegisterVariable (&r_ser);
 245         Cvar_RegisterVariable (&r_multitexture);
 246         if (gamemode == GAME_NEHAHRA)
 247                 Cvar_SetValue("r_fullbrights", 0);
 248         R_RegisterModule("GL_Main", gl_main_start, gl_main_shutdown, gl_main_newmap);
 249 }
 250
 251 /*
 252 ===============
 253 R_NewMap
 254 ===============
 255 */
 256 void CL_ParseEntityLump(char *entitystring);
 257 void R_NewMap (void)
 258 {
 259         int             i;
 260
 261         for (i=0 ; i<256 ; i++)
 262                 d_lightstylevalue[i] = 264;             // normal light value
 263
 264         r_viewleaf = NULL;
 265         if (cl.worldmodel->entities)
 266                 CL_ParseEntityLump(cl.worldmodel->entities);
 267         R_Modules_NewMap();
 268 }
 269
 270 extern void R_Textures_Init(void);
 271 extern void Mod_RenderInit(void);
 272 extern void GL_Draw_Init(void);
 273 extern void GL_Main_Init(void);
 274 extern void GL_Models_Init(void);
 275 extern void R_Sky_Init(void);
 276 extern void GL_Surf_Init(void);
 277 extern void R_Crosshairs_Init(void);
 278 extern void R_Light_Init(void);
 279 extern void R_Particles_Init(void);
 280 extern void R_Explosion_Init(void);
 281 extern void R_Clip_Init(void);
 282 extern void ui_init(void);
 283 extern void gl_backend_init(void);
 284
 285 void Render_Init(void)
 286 {
 287         R_Modules_Shutdown();
 288         R_Textures_Init();
 289         Mod_RenderInit();
 290         gl_backend_init();
 291         R_Clip_Init();
 292         GL_Draw_Init();
 293         GL_Main_Init();
 294         GL_Models_Init();
 295         R_Sky_Init();
 296         GL_Surf_Init();
 297         R_Crosshairs_Init();
 298         R_Light_Init();
 299         R_Particles_Init();
 300         R_Explosion_Init();
 301         ui_init();
 302         R_Modules_Start();
 303 }
 304
 305 /*
 306 ===============
 307 GL_Init
 308 ===============
 309 */
 310 extern char *ENGINE_EXTENSIONS;
 311 void GL_Init (void)
 312 {
 313         VID_CheckExtensions();
 314
 315         // LordHavoc: report supported extensions
 316         Con_Printf ("\nengine extensions: %s\n", ENGINE_EXTENSIONS);
 317
 318         qglCullFace(GL_FRONT);
 319         qglEnable(GL_TEXTURE_2D);
 320 }
 321
 322
 323 //==================================================================================
 324
 325 void R_Entity_Callback(void *data, void *junk)
 326 {
 327         ((entity_render_t *)data)->visframe = r_framecount;
 328 }
 329
 330 static void R_MarkEntities (void)
 331 {
 332         int             i;
 333         vec3_t  v;
 334
 335         if (!r_drawentities.integer)
 336                 return;
 337
 338         for (i = 0;i < r_refdef.numentities;i++)
 339         {
 340                 currentrenderentity = r_refdef.entities[i];
 341                 Mod_CheckLoaded(currentrenderentity->model);
 342
 343                 // move view-relative models to where they should be
 344                 if (currentrenderentity->flags & RENDER_VIEWMODEL)
 345                 {
 346                         // remove flag so it will not be repeated incase RelinkEntities is not called again for a while
 347                         currentrenderentity->flags -= RENDER_VIEWMODEL;
 348                         // transform origin
 349                         VectorCopy(currentrenderentity->origin, v);
 350                         currentrenderentity->origin[0] = v[0] * vpn[0] + v[1] * vright[0] + v[2] * vup[0] + r_origin[0];
 351                         currentrenderentity->origin[1] = v[0] * vpn[1] + v[1] * vright[1] + v[2] * vup[1] + r_origin[1];
 352                         currentrenderentity->origin[2] = v[0] * vpn[2] + v[1] * vright[2] + v[2] * vup[2] + r_origin[2];
 353                         // adjust angles
 354                         VectorAdd(currentrenderentity->angles, r_refdef.viewangles, currentrenderentity->angles);
 355                 }
 356
 357                 if (currentrenderentity->angles[0] || currentrenderentity->angles[2])
 358                 {
 359                         VectorMA(currentrenderentity->origin, currentrenderentity->scale, currentrenderentity->model->rotatedmins, currentrenderentity->mins);
 360                         VectorMA(currentrenderentity->origin, currentrenderentity->scale, currentrenderentity->model->rotatedmaxs, currentrenderentity->maxs);
 361                 }
 362                 else if (currentrenderentity->angles[1])
 363                 {
 364                         VectorMA(currentrenderentity->origin, currentrenderentity->scale, currentrenderentity->model->yawmins, currentrenderentity->mins);
 365                         VectorMA(currentrenderentity->origin, currentrenderentity->scale, currentrenderentity->model->yawmaxs, currentrenderentity->maxs);
 366                 }
 367                 else
 368                 {
 369                         VectorMA(currentrenderentity->origin, currentrenderentity->scale, currentrenderentity->model->normalmins, currentrenderentity->mins);
 370                         VectorMA(currentrenderentity->origin, currentrenderentity->scale, currentrenderentity->model->normalmaxs, currentrenderentity->maxs);
 371                 }
 372                 if (R_VisibleCullBox(currentrenderentity->mins, currentrenderentity->maxs))
 373                         continue;
 374
 375                 R_LerpAnimation(currentrenderentity);
 376                 if (r_ser.integer)
 377                         currentrenderentity->model->SERAddEntity();
 378                 else
 379                         currentrenderentity->visframe = r_framecount;
 380         }
 381 }
 382
 383 // only used if skyrendermasked, and normally returns false
 384 int R_DrawBModelSky (void)
 385 {
 386         int             i, sky = false;
 387
 388         if (!r_drawentities.integer)
 389                 return false;
 390
 391         for (i = 0;i < r_refdef.numentities;i++)
 392         {
 393                 currentrenderentity = r_refdef.entities[i];
 394                 if (currentrenderentity->visframe == r_framecount && currentrenderentity->model->DrawSky)
 395                 {
 396                         currentrenderentity->model->DrawSky();
 397                         sky = true;
 398                 }
 399         }
 400         return sky;
 401 }
 402
 403 void R_DrawModels (void)
 404 {
 405         int             i;
 406
 407         if (!r_drawentities.integer)
 408                 return;
 409
 410         for (i = 0;i < r_refdef.numentities;i++)
 411         {
 412                 currentrenderentity = r_refdef.entities[i];
 413                 if (currentrenderentity->visframe == r_framecount && currentrenderentity->model->Draw)
 414                         currentrenderentity->model->Draw();
 415         }
 416 }
 417
 418 /*
 419 =============
 420 R_DrawViewModel
 421 =============
 422 */
 423 void R_DrawViewModel (void)
 424 {
 425         // FIXME: move these checks to client
 426         if (!r_drawviewmodel.integer || chase_active.integer || envmap || !r_drawentities.integer || cl.items & IT_INVISIBILITY || cl.stats[STAT_HEALTH] <= 0 || !cl.viewent.render.model)
 427                 return;
 428
 429         currentrenderentity = &cl.viewent.render;
 430         Mod_CheckLoaded(currentrenderentity->model);
 431
 432         R_LerpAnimation(currentrenderentity);
 433
 434         currentrenderentity->model->Draw();
 435 }
 436
 437 static void R_SetFrustum (void)
 438 {
 439         int             i;
 440
 441         // LordHavoc: note to all quake engine coders, the special case for 90
 442         // degrees assumed a square view (wrong), so I removed it, Quake2 has it
 443         // disabled as well.
 444         // rotate VPN right by FOV_X/2 degrees
 445         RotatePointAroundVector( frustum[0].normal, vup, vpn, -(90-r_refdef.fov_x / 2 ) );
 446         // rotate VPN left by FOV_X/2 degrees
 447         RotatePointAroundVector( frustum[1].normal, vup, vpn, 90-r_refdef.fov_x / 2 );
 448         // rotate VPN up by FOV_X/2 degrees
 449         RotatePointAroundVector( frustum[2].normal, vright, vpn, 90-r_refdef.fov_y / 2 );
 450         // rotate VPN down by FOV_X/2 degrees
 451         RotatePointAroundVector( frustum[3].normal, vright, vpn, -( 90 - r_refdef.fov_y / 2 ) );
 452
 453
 454         for (i=0 ; i<4 ; i++)
 455         {
 456                 frustum[i].type = PLANE_ANYZ;
 457                 frustum[i].dist = DotProduct (r_origin, frustum[i].normal);
 458                 PlaneClassify(&frustum[i]);
 459         }
 460 }
 461
 462 /*
 463 ===============
 464 R_SetupFrame
 465 ===============
 466 */
 467 static void R_SetupFrame (void)
 468 {
 469 // don't allow cheats in multiplayer
 470         if (cl.maxclients > 1)
 471         {
 472                 if (r_fullbright.integer != 0)
 473                         Cvar_Set ("r_fullbright", "0");
 474                 if (r_ambient.value != 0)
 475                         Cvar_Set ("r_ambient", "0");
 476         }
 477         if (r_multitexture.integer && gl_textureunits < 2)
 478                 Cvar_SetValue("r_multitexture", 0);
 479
 480         r_framecount++;
 481
 482 // build the transformation matrix for the given view angles
 483         VectorCopy (r_refdef.vieworg, r_origin);
 484
 485         AngleVectors (r_refdef.viewangles, vpn, vright, vup);
 486
 487 // current viewleaf
 488         r_oldviewleaf = r_viewleaf;
 489         r_viewleaf = Mod_PointInLeaf (r_origin, cl.worldmodel);
 490
 491         R_AnimateLight ();
 492 }
 493
 494
 495 static int blendviewpolyindex[3] = {0, 1, 2};
 496
 497 static void R_BlendView(void)
 498 {
 499         rmeshinfo_t m;
 500         float tvxyz[3][4], r;
 501
 502         if (r_refdef.viewblend[3] < 0.01f)
 503                 return;
 504
 505         memset(&m, 0, sizeof(m));
 506         m.transparent = false;
 507         m.blendfunc1 = GL_SRC_ALPHA;
 508         m.blendfunc2 = GL_ONE_MINUS_SRC_ALPHA;
 509         m.depthdisable = true; // magic
 510         m.numtriangles = 1;
 511         m.numverts = 3;
 512         m.index = blendviewpolyindex;
 513         m.vertex = &tvxyz[0][0];
 514         m.vertexstep = sizeof(float[4]);
 515         m.cr = r_refdef.viewblend[0];
 516         m.cg = r_refdef.viewblend[1];
 517         m.cb = r_refdef.viewblend[2];
 518         m.ca = r_refdef.viewblend[3];
 519         r = 64000;
 520         tvxyz[0][0] = r_origin[0] + vpn[0] * 1.5 - vright[0] * r - vup[0] * r;
 521         tvxyz[0][1] = r_origin[1] + vpn[1] * 1.5 - vright[1] * r - vup[1] * r;
 522         tvxyz[0][2] = r_origin[2] + vpn[2] * 1.5 - vright[2] * r - vup[2] * r;
 523         r *= 3;
 524         tvxyz[1][0] = tvxyz[0][0] + vup[0] * r;
 525         tvxyz[1][1] = tvxyz[0][1] + vup[1] * r;
 526         tvxyz[1][2] = tvxyz[0][2] + vup[2] * r;
 527         tvxyz[2][0] = tvxyz[0][0] + vright[0] * r;
 528         tvxyz[2][1] = tvxyz[0][1] + vright[1] * r;
 529         tvxyz[2][2] = tvxyz[0][2] + vright[2] * r;
 530         R_Mesh_Draw(&m);
 531 }
 532
 533 /*
 534 ================
 535 R_RenderView
 536
 537 r_refdef must be set before the first call
 538 ================
 539 */
 540 void R_RenderView (void)
 541 {
 542         if (!cl.worldmodel)
 543                 return; //Host_Error ("R_RenderView: NULL worldmodel");
 544
 545         // FIXME: move to client
 546         R_MoveExplosions();
 547         R_TimeReport("mexplosion");
 548
 549         R_SetupFrame();
 550         R_SetFrustum();
 551         R_SetupFog();
 552         R_SkyStartFrame();
 553         if (r_ser.integer)
 554                 R_Clip_StartFrame();
 555         R_BuildLightList();
 556
 557         R_Mesh_Start();
 558
 559         R_TimeReport("setup");
 560
 561         R_DrawWorld();
 562         R_TimeReport("worldnode");
 563
 564         R_MarkEntities();
 565         R_TimeReport("markentity");
 566
 567         if (r_ser.integer)
 568         {
 569                 R_Clip_EndFrame();
 570                 R_TimeReport("hiddensurf");
 571         }
 572
 573         R_MarkWorldLights();
 574         R_TimeReport("marklights");
 575
 576         if (skyrendermasked)
 577         {
 578                 if (R_DrawBModelSky())
 579                         R_TimeReport("bmodelsky");
 580         }
 581         else
 582         {
 583                 R_DrawViewModel();
 584                 R_TimeReport("viewmodel");
 585         }
 586
 587         R_SetupForWorldRendering();
 588         R_PrepareSurfaces();
 589         R_TimeReport("surfprep");
 590
 591         R_DrawSurfaces(SHADERSTAGE_SKY);
 592         R_DrawSurfaces(SHADERSTAGE_NORMAL);
 593         R_TimeReport("surfdraw");
 594
 595         if (r_drawportals.integer)
 596         {
 597                 R_DrawPortals();
 598                 R_TimeReport("portals");
 599         }
 600
 601         // don't let sound skip if going slow
 602         if (!intimerefresh && !r_speeds.integer)
 603                 S_ExtraUpdate ();
 604
 605         if (skyrendermasked)
 606         {
 607                 R_DrawViewModel();
 608                 R_TimeReport("viewmodel");
 609         }
 610
 611         R_DrawModels();
 612         R_TimeReport("models");
 613
 614         R_DrawParticles();
 615         R_TimeReport("particles");
 616
 617         R_DrawExplosions();
 618         R_TimeReport("explosions");
 619
 620         // draw transparent meshs
 621         R_Mesh_AddTransparent();
 622         R_TimeReport("addtrans");
 623
 624         R_DrawCoronas();
 625         R_TimeReport("coronas");
 626
 627         R_BlendView();
 628         R_TimeReport("blendview");
 629
 630         R_DrawCrosshair();
 631         R_TimeReport("crosshair");
 632
 633         // render any queued meshs
 634         R_Mesh_Finish();
 635         R_TimeReport("meshfinish");
 636 }
 637