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_multitexture = {0, "r_multitexture", "1"};
  69
  70 /*
  71 ====================
  72 R_TimeRefresh_f
  73
  74 For program optimization
  75 ====================
  76 */
  77 qboolean intimerefresh = 0;
  78 static void R_TimeRefresh_f (void)
  79 {
  80         int                     i;
  81         float           start, stop, time;
  82
  83         intimerefresh = 1;
  84         start = Sys_DoubleTime ();
  85         for (i = 0;i < 128;i++)
  86         {
  87                 r_refdef.viewangles[0] = 0;
  88                 r_refdef.viewangles[1] = i/128.0*360.0;
  89                 r_refdef.viewangles[2] = 0;
  90                 CL_UpdateScreen();
  91         }
  92
  93         stop = Sys_DoubleTime ();
  94         intimerefresh = 0;
  95         time = stop-start;
  96         Con_Printf ("%f seconds (%f fps)\n", time, 128/time);
  97 }
  98
  99 extern cvar_t r_drawportals;
 100
 101 int R_VisibleCullBox (vec3_t mins, vec3_t maxs)
 102 {
 103         int sides;
 104         mnode_t *nodestack[8192], *node;
 105         int stack = 0;
 106
 107         if (R_CullBox(mins, maxs))
 108                 return true;
 109
 110         node = cl.worldmodel->nodes;
 111 loc0:
 112         if (node->contents < 0)
 113         {
 114                 if (((mleaf_t *)node)->visframe == r_framecount)
 115                         return false;
 116                 if (!stack)
 117                         return true;
 118                 node = nodestack[--stack];
 119                 goto loc0;
 120         }
 121
 122         sides = BOX_ON_PLANE_SIDE(mins, maxs, node->plane);
 123
 124 // recurse down the contacted sides
 125         if (sides & 1)
 126         {
 127                 if (sides & 2) // 3
 128                 {
 129                         // put second child on the stack for later examination
 130                         nodestack[stack++] = node->children[1];
 131                         node = node->children[0];
 132                         goto loc0;
 133                 }
 134                 else // 1
 135                 {
 136                         node = node->children[0];
 137                         goto loc0;
 138                 }
 139         }
 140         // 2
 141         node = node->children[1];
 142         goto loc0;
 143 }
 144
 145 vec3_t fogcolor;
 146 vec_t fogdensity;
 147 float fog_density, fog_red, fog_green, fog_blue;
 148 qboolean fogenabled;
 149 qboolean oldgl_fogenable;
 150 void R_SetupFog(void)
 151 {
 152         if (gamemode == GAME_NEHAHRA)
 153         {
 154                 if (gl_fogenable.integer)
 155                 {
 156                         oldgl_fogenable = true;
 157                         fog_density = gl_fogdensity.value;
 158                         fog_red = gl_fogred.value;
 159                         fog_green = gl_foggreen.value;
 160                         fog_blue = gl_fogblue.value;
 161                 }
 162                 else if (oldgl_fogenable)
 163                 {
 164                         oldgl_fogenable = false;
 165                         fog_density = 0;
 166                         fog_red = 0;
 167                         fog_green = 0;
 168                         fog_blue = 0;
 169                 }
 170         }
 171         if (fog_density)
 172         {
 173                 fogcolor[0] = fog_red   = bound(0.0f, fog_red  , 1.0f);
 174                 fogcolor[1] = fog_green = bound(0.0f, fog_green, 1.0f);
 175                 fogcolor[2] = fog_blue  = bound(0.0f, fog_blue , 1.0f);
 176         }
 177         if (fog_density)
 178         {
 179                 fogenabled = true;
 180                 fogdensity = -4000.0f / (fog_density * fog_density);
 181                 // fog color was already set
 182         }
 183         else
 184                 fogenabled = false;
 185 }
 186
 187 // FIXME: move this to client?
 188 void FOG_clear(void)
 189 {
 190         if (gamemode == GAME_NEHAHRA)
 191         {
 192                 Cvar_Set("gl_fogenable", "0");
 193                 Cvar_Set("gl_fogdensity", "0.2");
 194                 Cvar_Set("gl_fogred", "0.3");
 195                 Cvar_Set("gl_foggreen", "0.3");
 196                 Cvar_Set("gl_fogblue", "0.3");
 197         }
 198         fog_density = fog_red = fog_green = fog_blue = 0.0f;
 199 }
 200
 201 // FIXME: move this to client?
 202 void FOG_registercvars(void)
 203 {
 204         if (gamemode == GAME_NEHAHRA)
 205         {
 206                 Cvar_RegisterVariable (&gl_fogenable);
 207                 Cvar_RegisterVariable (&gl_fogdensity);
 208                 Cvar_RegisterVariable (&gl_fogred);
 209                 Cvar_RegisterVariable (&gl_foggreen);
 210                 Cvar_RegisterVariable (&gl_fogblue);
 211                 Cvar_RegisterVariable (&gl_fogstart);
 212                 Cvar_RegisterVariable (&gl_fogend);
 213         }
 214 }
 215
 216 void gl_main_start(void)
 217 {
 218 }
 219
 220 void gl_main_shutdown(void)
 221 {
 222 }
 223
 224 void gl_main_newmap(void)
 225 {
 226         r_framecount = 1;
 227 }
 228
 229 void GL_Main_Init(void)
 230 {
 231 // FIXME: move this to client?
 232         FOG_registercvars();
 233         Cmd_AddCommand ("timerefresh", R_TimeRefresh_f);
 234         Cvar_RegisterVariable (&r_drawentities);
 235         Cvar_RegisterVariable (&r_drawviewmodel);
 236         Cvar_RegisterVariable (&r_speeds);
 237         Cvar_RegisterVariable (&r_fullbrights);
 238         Cvar_RegisterVariable (&r_wateralpha);
 239         Cvar_RegisterVariable (&r_dynamic);
 240         Cvar_RegisterVariable (&r_waterripple);
 241         Cvar_RegisterVariable (&r_fullbright);
 242         Cvar_RegisterVariable (&r_multitexture);
 243         if (gamemode == GAME_NEHAHRA)
 244                 Cvar_SetValue("r_fullbrights", 0);
 245         R_RegisterModule("GL_Main", gl_main_start, gl_main_shutdown, gl_main_newmap);
 246 }
 247
 248 /*
 249 ===============
 250 R_NewMap
 251 ===============
 252 */
 253 void CL_ParseEntityLump(char *entitystring);
 254 void R_NewMap (void)
 255 {
 256         int             i;
 257
 258         for (i=0 ; i<256 ; i++)
 259                 d_lightstylevalue[i] = 264;             // normal light value
 260
 261         r_viewleaf = NULL;
 262         if (cl.worldmodel->entities)
 263                 CL_ParseEntityLump(cl.worldmodel->entities);
 264         R_Modules_NewMap();
 265 }
 266
 267 extern void R_Textures_Init(void);
 268 extern void Mod_RenderInit(void);
 269 extern void GL_Draw_Init(void);
 270 extern void GL_Main_Init(void);
 271 extern void GL_Models_Init(void);
 272 extern void R_Sky_Init(void);
 273 extern void GL_Surf_Init(void);
 274 extern void R_Crosshairs_Init(void);
 275 extern void R_Light_Init(void);
 276 extern void R_Particles_Init(void);
 277 extern void R_Explosion_Init(void);
 278 extern void ui_init(void);
 279 extern void gl_backend_init(void);
 280
 281 void Render_Init(void)
 282 {
 283         R_Modules_Shutdown();
 284         R_Textures_Init();
 285         Mod_RenderInit();
 286         gl_backend_init();
 287         GL_Draw_Init();
 288         GL_Main_Init();
 289         GL_Models_Init();
 290         R_Sky_Init();
 291         GL_Surf_Init();
 292         R_Crosshairs_Init();
 293         R_Light_Init();
 294         R_Particles_Init();
 295         R_Explosion_Init();
 296         ui_init();
 297         R_Modules_Start();
 298 }
 299
 300 /*
 301 ===============
 302 GL_Init
 303 ===============
 304 */
 305 extern char *ENGINE_EXTENSIONS;
 306 void GL_Init (void)
 307 {
 308         VID_CheckExtensions();
 309
 310         // LordHavoc: report supported extensions
 311         Con_Printf ("\nengine extensions: %s\n", ENGINE_EXTENSIONS);
 312
 313         qglCullFace(GL_FRONT);
 314         qglEnable(GL_TEXTURE_2D);
 315 }
 316
 317
 318 //==================================================================================
 319
 320 void R_Entity_Callback(void *data, void *junk)
 321 {
 322         ((entity_render_t *)data)->visframe = r_framecount;
 323 }
 324
 325 static void R_MarkEntities (void)
 326 {
 327         int             i;
 328         vec3_t  v;
 329
 330         if (!r_drawentities.integer)
 331                 return;
 332
 333         for (i = 0;i < r_refdef.numentities;i++)
 334         {
 335                 currentrenderentity = r_refdef.entities[i];
 336                 Mod_CheckLoaded(currentrenderentity->model);
 337
 338                 // move view-relative models to where they should be
 339                 if (currentrenderentity->flags & RENDER_VIEWMODEL)
 340                 {
 341                         // remove flag so it will not be repeated incase RelinkEntities is not called again for a while
 342                         currentrenderentity->flags -= RENDER_VIEWMODEL;
 343                         // transform origin
 344                         VectorCopy(currentrenderentity->origin, v);
 345                         currentrenderentity->origin[0] = v[0] * vpn[0] + v[1] * vright[0] + v[2] * vup[0] + r_origin[0];
 346                         currentrenderentity->origin[1] = v[0] * vpn[1] + v[1] * vright[1] + v[2] * vup[1] + r_origin[1];
 347                         currentrenderentity->origin[2] = v[0] * vpn[2] + v[1] * vright[2] + v[2] * vup[2] + r_origin[2];
 348                         // adjust angles
 349                         VectorAdd(currentrenderentity->angles, r_refdef.viewangles, currentrenderentity->angles);
 350                 }
 351
 352                 if (currentrenderentity->angles[0] || currentrenderentity->angles[2])
 353                 {
 354                         VectorMA(currentrenderentity->origin, currentrenderentity->scale, currentrenderentity->model->rotatedmins, currentrenderentity->mins);
 355                         VectorMA(currentrenderentity->origin, currentrenderentity->scale, currentrenderentity->model->rotatedmaxs, currentrenderentity->maxs);
 356                 }
 357                 else if (currentrenderentity->angles[1])
 358                 {
 359                         VectorMA(currentrenderentity->origin, currentrenderentity->scale, currentrenderentity->model->yawmins, currentrenderentity->mins);
 360                         VectorMA(currentrenderentity->origin, currentrenderentity->scale, currentrenderentity->model->yawmaxs, currentrenderentity->maxs);
 361                 }
 362                 else
 363                 {
 364                         VectorMA(currentrenderentity->origin, currentrenderentity->scale, currentrenderentity->model->normalmins, currentrenderentity->mins);
 365                         VectorMA(currentrenderentity->origin, currentrenderentity->scale, currentrenderentity->model->normalmaxs, currentrenderentity->maxs);
 366                 }
 367                 if (R_VisibleCullBox(currentrenderentity->mins, currentrenderentity->maxs))
 368                         continue;
 369
 370                 R_LerpAnimation(currentrenderentity);
 371                 currentrenderentity->visframe = r_framecount;
 372         }
 373 }
 374
 375 // only used if skyrendermasked, and normally returns false
 376 int R_DrawBModelSky (void)
 377 {
 378         int             i, sky = false;
 379
 380         if (!r_drawentities.integer)
 381                 return false;
 382
 383         for (i = 0;i < r_refdef.numentities;i++)
 384         {
 385                 currentrenderentity = r_refdef.entities[i];
 386                 if (currentrenderentity->visframe == r_framecount && currentrenderentity->model->DrawSky)
 387                 {
 388                         currentrenderentity->model->DrawSky();
 389                         sky = true;
 390                 }
 391         }
 392         return sky;
 393 }
 394
 395 void R_DrawModels (void)
 396 {
 397         int             i;
 398
 399         if (!r_drawentities.integer)
 400                 return;
 401
 402         for (i = 0;i < r_refdef.numentities;i++)
 403         {
 404                 currentrenderentity = r_refdef.entities[i];
 405                 if (currentrenderentity->visframe == r_framecount && currentrenderentity->model->Draw)
 406                         currentrenderentity->model->Draw();
 407         }
 408 }
 409
 410 /*
 411 =============
 412 R_DrawViewModel
 413 =============
 414 */
 415 void R_DrawViewModel (void)
 416 {
 417         // FIXME: move these checks to client
 418         if (!r_drawviewmodel.integer || chase_active.integer || envmap || !r_drawentities.integer || cl.items & IT_INVISIBILITY || cl.stats[STAT_HEALTH] <= 0 || !cl.viewent.render.model)
 419                 return;
 420
 421         currentrenderentity = &cl.viewent.render;
 422         Mod_CheckLoaded(currentrenderentity->model);
 423
 424         R_LerpAnimation(currentrenderentity);
 425
 426         currentrenderentity->model->Draw();
 427 }
 428
 429 static void R_SetFrustum (void)
 430 {
 431         int             i;
 432
 433         // LordHavoc: note to all quake engine coders, the special case for 90
 434         // degrees assumed a square view (wrong), so I removed it, Quake2 has it
 435         // disabled as well.
 436         // rotate VPN right by FOV_X/2 degrees
 437         RotatePointAroundVector( frustum[0].normal, vup, vpn, -(90-r_refdef.fov_x / 2 ) );
 438         // rotate VPN left by FOV_X/2 degrees
 439         RotatePointAroundVector( frustum[1].normal, vup, vpn, 90-r_refdef.fov_x / 2 );
 440         // rotate VPN up by FOV_X/2 degrees
 441         RotatePointAroundVector( frustum[2].normal, vright, vpn, 90-r_refdef.fov_y / 2 );
 442         // rotate VPN down by FOV_X/2 degrees
 443         RotatePointAroundVector( frustum[3].normal, vright, vpn, -( 90 - r_refdef.fov_y / 2 ) );
 444
 445
 446         for (i=0 ; i<4 ; i++)
 447         {
 448                 frustum[i].type = PLANE_ANYZ;
 449                 frustum[i].dist = DotProduct (r_origin, frustum[i].normal);
 450                 PlaneClassify(&frustum[i]);
 451         }
 452 }
 453
 454 /*
 455 ===============
 456 R_SetupFrame
 457 ===============
 458 */
 459 static void R_SetupFrame (void)
 460 {
 461 // don't allow cheats in multiplayer
 462         if (cl.maxclients > 1)
 463         {
 464                 if (r_fullbright.integer != 0)
 465                         Cvar_Set ("r_fullbright", "0");
 466                 if (r_ambient.value != 0)
 467                         Cvar_Set ("r_ambient", "0");
 468         }
 469         if (r_multitexture.integer && gl_textureunits < 2)
 470                 Cvar_SetValue("r_multitexture", 0);
 471
 472         r_framecount++;
 473
 474 // build the transformation matrix for the given view angles
 475         VectorCopy (r_refdef.vieworg, r_origin);
 476
 477         AngleVectors (r_refdef.viewangles, vpn, vright, vup);
 478
 479 // current viewleaf
 480         r_oldviewleaf = r_viewleaf;
 481         r_viewleaf = Mod_PointInLeaf (r_origin, cl.worldmodel);
 482
 483         R_AnimateLight ();
 484 }
 485
 486
 487 static int blendviewpolyindex[3] = {0, 1, 2};
 488
 489 static void R_BlendView(void)
 490 {
 491         rmeshinfo_t m;
 492         float tvxyz[3][4], r;
 493
 494         if (r_refdef.viewblend[3] < 0.01f)
 495                 return;
 496
 497         memset(&m, 0, sizeof(m));
 498         m.transparent = false;
 499         m.blendfunc1 = GL_SRC_ALPHA;
 500         m.blendfunc2 = GL_ONE_MINUS_SRC_ALPHA;
 501         m.depthdisable = true; // magic
 502         m.numtriangles = 1;
 503         m.numverts = 3;
 504         m.index = blendviewpolyindex;
 505         m.vertex = &tvxyz[0][0];
 506         m.vertexstep = sizeof(float[4]);
 507         m.cr = r_refdef.viewblend[0];
 508         m.cg = r_refdef.viewblend[1];
 509         m.cb = r_refdef.viewblend[2];
 510         m.ca = r_refdef.viewblend[3];
 511         r = 64000;
 512         tvxyz[0][0] = r_origin[0] + vpn[0] * 1.5 - vright[0] * r - vup[0] * r;
 513         tvxyz[0][1] = r_origin[1] + vpn[1] * 1.5 - vright[1] * r - vup[1] * r;
 514         tvxyz[0][2] = r_origin[2] + vpn[2] * 1.5 - vright[2] * r - vup[2] * r;
 515         r *= 3;
 516         tvxyz[1][0] = tvxyz[0][0] + vup[0] * r;
 517         tvxyz[1][1] = tvxyz[0][1] + vup[1] * r;
 518         tvxyz[1][2] = tvxyz[0][2] + vup[2] * r;
 519         tvxyz[2][0] = tvxyz[0][0] + vright[0] * r;
 520         tvxyz[2][1] = tvxyz[0][1] + vright[1] * r;
 521         tvxyz[2][2] = tvxyz[0][2] + vright[2] * r;
 522         R_Mesh_Draw(&m);
 523 }
 524
 525 /*
 526 ================
 527 R_RenderView
 528
 529 r_refdef must be set before the first call
 530 ================
 531 */
 532 void R_RenderView (void)
 533 {
 534         if (!cl.worldmodel)
 535                 return; //Host_Error ("R_RenderView: NULL worldmodel");
 536
 537         // FIXME: move to client
 538         R_MoveExplosions();
 539         R_TimeReport("mexplosion");
 540
 541         R_SetupFrame();
 542         R_SetFrustum();
 543         R_SetupFog();
 544         R_SkyStartFrame();
 545         R_BuildLightList();
 546
 547         R_Mesh_Start();
 548
 549         R_TimeReport("setup");
 550
 551         R_DrawWorld();
 552         R_TimeReport("worldnode");
 553
 554         R_MarkEntities();
 555         R_TimeReport("markentity");
 556
 557         R_MarkWorldLights();
 558         R_TimeReport("marklights");
 559
 560         if (skyrendermasked)
 561         {
 562                 if (R_DrawBModelSky())
 563                         R_TimeReport("bmodelsky");
 564         }
 565         else
 566         {
 567                 R_DrawViewModel();
 568                 R_TimeReport("viewmodel");
 569         }
 570
 571         R_SetupForWorldRendering();
 572         R_PrepareSurfaces();
 573         R_TimeReport("surfprep");
 574
 575         R_DrawSurfaces(SHADERSTAGE_SKY);
 576         R_DrawSurfaces(SHADERSTAGE_NORMAL);
 577         R_TimeReport("surfdraw");
 578
 579         if (r_drawportals.integer)
 580         {
 581                 R_DrawPortals();
 582                 R_TimeReport("portals");
 583         }
 584
 585         // don't let sound skip if going slow
 586         if (!intimerefresh && !r_speeds.integer)
 587                 S_ExtraUpdate ();
 588
 589         if (skyrendermasked)
 590         {
 591                 R_DrawViewModel();
 592                 R_TimeReport("viewmodel");
 593         }
 594
 595         R_DrawModels();
 596         R_TimeReport("models");
 597
 598         R_DrawParticles();
 599         R_TimeReport("particles");
 600
 601         R_DrawExplosions();
 602         R_TimeReport("explosions");
 603
 604         // draw transparent meshs
 605         R_Mesh_AddTransparent();
 606         R_TimeReport("addtrans");
 607
 608         R_DrawCoronas();
 609         R_TimeReport("coronas");
 610
 611         R_BlendView();
 612         R_TimeReport("blendview");
 613
 614         R_DrawCrosshair();
 615         R_TimeReport("crosshair");
 616
 617         // render any queued meshs
 618         R_Mesh_Finish();
 619         R_TimeReport("meshfinish");
 620 }
 621