gl_backend.c

   1
   2 #include "quakedef.h"
   3
   4 //cvar_t gl_mesh_maxtriangles = {0, "gl_mesh_maxtriangles", "21760"};
   5 cvar_t gl_mesh_maxtriangles = {0, "gl_mesh_maxtriangles", "8192"};
   6 //cvar_t gl_mesh_batchtriangles = {0, "gl_mesh_batchtriangles", "1024"};
   7 cvar_t gl_mesh_batchtriangles = {0, "gl_mesh_batchtriangles", "0"};
   8 cvar_t gl_mesh_floatcolors = {0, "gl_mesh_floatcolors", "0"};
   9
  10 cvar_t r_render = {0, "r_render", "1"};
  11 cvar_t gl_dither = {CVAR_SAVE, "gl_dither", "1"}; // whether or not to use dithering
  12 cvar_t gl_lockarrays = {0, "gl_lockarrays", "1"};
  13
  14 #ifdef DEBUGGL
  15 int errornumber = 0;
  16
  17 void GL_PrintError(int errornumber, char *filename, int linenumber)
  18 {
  19         switch(errornumber)
  20         {
  21 #ifdef GL_INVALID_ENUM
  22         case GL_INVALID_ENUM:
  23                 Con_Printf("GL_INVALID_ENUM at %s:%i\n", filename, linenumber);
  24                 break;
  25 #endif
  26 #ifdef GL_INVALID_VALUE
  27         case GL_INVALID_VALUE:
  28                 Con_Printf("GL_INVALID_VALUE at %s:%i\n", filename, linenumber);
  29                 break;
  30 #endif
  31 #ifdef GL_INVALID_OPERATION
  32         case GL_INVALID_OPERATION:
  33                 Con_Printf("GL_INVALID_OPERATION at %s:%i\n", filename, linenumber);
  34                 break;
  35 #endif
  36 #ifdef GL_STACK_OVERFLOW
  37         case GL_STACK_OVERFLOW:
  38                 Con_Printf("GL_STACK_OVERFLOW at %s:%i\n", filename, linenumber);
  39                 break;
  40 #endif
  41 #ifdef GL_STACK_UNDERFLOW
  42         case GL_STACK_UNDERFLOW:
  43                 Con_Printf("GL_STACK_UNDERFLOW at %s:%i\n", filename, linenumber);
  44                 break;
  45 #endif
  46 #ifdef GL_OUT_OF_MEMORY
  47         case GL_OUT_OF_MEMORY:
  48                 Con_Printf("GL_OUT_OF_MEMORY at %s:%i\n", filename, linenumber);
  49                 break;
  50 #endif
  51 #ifdef GL_TABLE_TOO_LARGE
  52     case GL_TABLE_TOO_LARGE:
  53                 Con_Printf("GL_TABLE_TOO_LARGE at %s:%i\n", filename, linenumber);
  54                 break;
  55 #endif
  56         default:
  57                 Con_Printf("GL UNKNOWN (%i) at %s:%i\n", errornumber, filename, linenumber);
  58                 break;
  59         }
  60 }
  61 #endif
  62
  63 float r_farclip, r_newfarclip;
  64
  65 int polyindexarray[768];
  66
  67 static float viewdist;
  68
  69 int c_meshs, c_meshtris, c_transmeshs, c_transtris;
  70
  71 int                     lightscalebit;
  72 float           lightscale;
  73 float           overbrightscale;
  74
  75 void SCR_ScreenShot_f (void);
  76
  77 static int max_meshs;
  78 static int max_batch;
  79 static int max_verts; // always max_meshs * 3
  80 #define TRANSDEPTHRES 4096
  81
  82 typedef struct buf_mesh_s
  83 {
  84         int depthmask;
  85         int depthtest;
  86         int blendfunc1, blendfunc2;
  87         int textures[MAX_TEXTUREUNITS];
  88         float texturergbscale[MAX_TEXTUREUNITS];
  89         int firsttriangle;
  90         int triangles;
  91         int firstvert;
  92         int verts;
  93         struct buf_mesh_s *chain;
  94         struct buf_transtri_s *transchain;
  95 }
  96 buf_mesh_t;
  97
  98 typedef struct buf_transtri_s
  99 {
 100         struct buf_transtri_s *next;
 101         struct buf_transtri_s *meshsortchain;
 102         buf_mesh_t *mesh;
 103         int index[3];
 104 }
 105 buf_transtri_t;
 106
 107 typedef struct buf_tri_s
 108 {
 109         int index[3];
 110 }
 111 buf_tri_t;
 112
 113 typedef struct
 114 {
 115         float v[4];
 116 }
 117 buf_vertex_t;
 118
 119 typedef struct
 120 {
 121         float c[4];
 122 }
 123 buf_fcolor_t;
 124
 125 typedef struct
 126 {
 127         qbyte c[4];
 128 }
 129 buf_bcolor_t;
 130
 131 typedef struct
 132 {
 133         float t[2];
 134 }
 135 buf_texcoord_t;
 136
 137 static float meshfarclip;
 138 static int currentmesh, currenttriangle, currentvertex, backendunits, backendactive, transranout;
 139 static buf_mesh_t *buf_mesh;
 140 static buf_tri_t *buf_tri;
 141 static buf_vertex_t *buf_vertex;
 142 static buf_fcolor_t *buf_fcolor;
 143 static buf_bcolor_t *buf_bcolor;
 144 static buf_texcoord_t *buf_texcoord[MAX_TEXTUREUNITS];
 145
 146 static int currenttransmesh, currenttransvertex, currenttranstriangle;
 147 static buf_mesh_t *buf_transmesh;
 148 static buf_transtri_t *buf_sorttranstri;
 149 static buf_transtri_t **buf_sorttranstri_list;
 150 static buf_tri_t *buf_transtri;
 151 static buf_vertex_t *buf_transvertex;
 152 static buf_fcolor_t *buf_transfcolor;
 153 static buf_texcoord_t *buf_transtexcoord[MAX_TEXTUREUNITS];
 154
 155 static mempool_t *gl_backend_mempool;
 156 static int resizingbuffers = false;
 157
 158 static void gl_backend_start(void)
 159 {
 160         int i;
 161
 162         max_verts = max_meshs * 3;
 163
 164         if (!gl_backend_mempool)
 165                 gl_backend_mempool = Mem_AllocPool("GL_Backend");
 166
 167 #define BACKENDALLOC(var, count, sizeofstruct)\
 168         {\
 169                 var = Mem_Alloc(gl_backend_mempool, count * sizeof(sizeofstruct));\
 170                 if (var == NULL)\
 171                         Sys_Error("gl_backend_start: unable to allocate memory\n");\
 172                 memset(var, 0, count * sizeof(sizeofstruct));\
 173         }
 174
 175         BACKENDALLOC(buf_mesh, max_meshs, buf_mesh_t)
 176         BACKENDALLOC(buf_tri, max_meshs, buf_tri_t)
 177         BACKENDALLOC(buf_vertex, max_verts, buf_vertex_t)
 178         BACKENDALLOC(buf_fcolor, max_verts, buf_fcolor_t)
 179         BACKENDALLOC(buf_bcolor, max_verts, buf_bcolor_t)
 180
 181         BACKENDALLOC(buf_transmesh, max_meshs, buf_mesh_t)
 182         BACKENDALLOC(buf_sorttranstri, max_meshs, buf_transtri_t)
 183         BACKENDALLOC(buf_sorttranstri_list, TRANSDEPTHRES, buf_transtri_t *)
 184         BACKENDALLOC(buf_transtri, max_meshs, buf_tri_t)
 185         BACKENDALLOC(buf_transvertex, max_verts, buf_vertex_t)
 186         BACKENDALLOC(buf_transfcolor, max_verts, buf_fcolor_t)
 187
 188         for (i = 0;i < MAX_TEXTUREUNITS;i++)
 189         {
 190                 // only allocate as many texcoord arrays as we need
 191                 if (i < gl_textureunits)
 192                 {
 193                         BACKENDALLOC(buf_texcoord[i], max_verts, buf_texcoord_t)
 194                         BACKENDALLOC(buf_transtexcoord[i], max_verts, buf_texcoord_t)
 195                 }
 196                 else
 197                 {
 198                         buf_texcoord[i] = NULL;
 199                         buf_transtexcoord[i] = NULL;
 200                 }
 201         }
 202         backendunits = min(MAX_TEXTUREUNITS, gl_textureunits);
 203         backendactive = true;
 204 }
 205
 206 static void gl_backend_shutdown(void)
 207 {
 208         if (resizingbuffers)
 209                 Mem_EmptyPool(gl_backend_mempool);
 210         else
 211                 Mem_FreePool(&gl_backend_mempool);
 212
 213         backendunits = 0;
 214         backendactive = false;
 215 }
 216
 217 static void gl_backend_bufferchanges(int init)
 218 {
 219         // 21760 is (65536 / 3) rounded off to a multiple of 128
 220         if (gl_mesh_maxtriangles.integer < 256)
 221                 Cvar_SetValue("gl_mesh_maxtriangles", 256);
 222         if (gl_mesh_maxtriangles.integer > 21760)
 223                 Cvar_SetValue("gl_mesh_maxtriangles", 21760);
 224
 225         if (gl_mesh_batchtriangles.integer < 0)
 226                 Cvar_SetValue("gl_mesh_batchtriangles", 0);
 227         if (gl_mesh_batchtriangles.integer > gl_mesh_maxtriangles.integer)
 228                 Cvar_SetValue("gl_mesh_batchtriangles", gl_mesh_maxtriangles.integer);
 229
 230         max_batch = gl_mesh_batchtriangles.integer;
 231
 232         if (max_meshs != gl_mesh_maxtriangles.integer)
 233         {
 234                 max_meshs = gl_mesh_maxtriangles.integer;
 235
 236                 if (!init)
 237                 {
 238                         resizingbuffers = true;
 239                         gl_backend_shutdown();
 240                         gl_backend_start();
 241                         resizingbuffers = false;
 242                 }
 243         }
 244 }
 245
 246 static void gl_backend_newmap(void)
 247 {
 248         r_farclip = r_newfarclip = 2048.0f;
 249 }
 250
 251 void gl_backend_init(void)
 252 {
 253         int i;
 254
 255         Cvar_RegisterVariable(&r_render);
 256         Cvar_RegisterVariable(&gl_dither);
 257         Cvar_RegisterVariable(&gl_lockarrays);
 258 #ifdef NORENDER
 259         Cvar_SetValue("r_render", 0);
 260 #endif
 261
 262         Cvar_RegisterVariable(&gl_mesh_maxtriangles);
 263         Cvar_RegisterVariable(&gl_mesh_batchtriangles);
 264         Cvar_RegisterVariable(&gl_mesh_floatcolors);
 265         R_RegisterModule("GL_Backend", gl_backend_start, gl_backend_shutdown, gl_backend_newmap);
 266         gl_backend_bufferchanges(true);
 267         for (i = 0;i < 256;i++)
 268         {
 269                 polyindexarray[i*3+0] = 0;
 270                 polyindexarray[i*3+1] = i + 1;
 271                 polyindexarray[i*3+2] = i + 2;
 272         }
 273 }
 274
 275 int arraylocked = false;
 276
 277 void GL_LockArray(int first, int count)
 278 {
 279         if (!arraylocked && gl_supportslockarrays && gl_lockarrays.integer)
 280         {
 281                 qglLockArraysEXT(first, count);
 282                 CHECKGLERROR
 283                 arraylocked = true;
 284         }
 285 }
 286
 287 void GL_UnlockArray(void)
 288 {
 289         if (arraylocked)
 290         {
 291                 qglUnlockArraysEXT();
 292                 CHECKGLERROR
 293                 arraylocked = false;
 294         }
 295 }
 296
 297 //static float gldepthmin, gldepthmax;
 298
 299 /*
 300 =============
 301 GL_SetupFrame
 302 =============
 303 */
 304 static void GL_SetupFrame (void)
 305 {
 306         double xmax, ymax;
 307         double fovx, fovy, zNear, zFar, aspect;
 308
 309         // update farclip based on previous frame
 310         r_farclip = r_newfarclip;
 311
 312         if (!r_render.integer)
 313                 return;
 314
 315 //      glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // LordHavoc: moved to SCR_UpdateScreen
 316 //      gldepthmin = 0;
 317 //      gldepthmax = 1;
 318         glDepthFunc (GL_LEQUAL);CHECKGLERROR
 319
 320 //      glDepthRange (gldepthmin, gldepthmax);CHECKGLERROR
 321
 322         // set up viewpoint
 323         glMatrixMode(GL_PROJECTION);CHECKGLERROR
 324         glLoadIdentity ();CHECKGLERROR
 325
 326         // y is weird beause OpenGL is bottom to top, we use top to bottom
 327         glViewport(r_refdef.x, vid.realheight - (r_refdef.y + r_refdef.height), r_refdef.width, r_refdef.height);CHECKGLERROR
 328
 329         // depth range
 330         zNear = 1.0;
 331         zFar = r_farclip;
 332
 333         // fov angles
 334         fovx = r_refdef.fov_x;
 335         fovy = r_refdef.fov_y;
 336         aspect = r_refdef.width / r_refdef.height;
 337
 338         // pyramid slopes
 339         xmax = zNear * tan(fovx * M_PI / 360.0) * aspect;
 340         ymax = zNear * tan(fovy * M_PI / 360.0);
 341
 342         // set view pyramid
 343         glFrustum(-xmax, xmax, -ymax, ymax, zNear, zFar);CHECKGLERROR
 344
 345 //      glCullFace(GL_FRONT);CHECKGLERROR
 346
 347         glMatrixMode(GL_MODELVIEW);CHECKGLERROR
 348         glLoadIdentity ();CHECKGLERROR
 349
 350         // put Z going up
 351         glRotatef (-90,  1, 0, 0);CHECKGLERROR
 352         glRotatef (90,  0, 0, 1);CHECKGLERROR
 353         // camera rotation
 354         glRotatef (-r_refdef.viewangles[2],  1, 0, 0);CHECKGLERROR
 355         glRotatef (-r_refdef.viewangles[0],  0, 1, 0);CHECKGLERROR
 356         glRotatef (-r_refdef.viewangles[1],  0, 0, 1);CHECKGLERROR
 357         // camera location
 358         glTranslatef (-r_refdef.vieworg[0],  -r_refdef.vieworg[1],  -r_refdef.vieworg[2]);CHECKGLERROR
 359
 360 //      glGetFloatv (GL_MODELVIEW_MATRIX, r_world_matrix);
 361
 362         //
 363         // set drawing parms
 364         //
 365 //      if (gl_cull.integer)
 366 //      {
 367 //              glEnable(GL_CULL_FACE);CHECKGLERROR
 368 //      }
 369 //      else
 370 //      {
 371 //              glDisable(GL_CULL_FACE);CHECKGLERROR
 372 //      }
 373
 374 //      glEnable(GL_BLEND);CHECKGLERROR
 375 //      glEnable(GL_DEPTH_TEST);CHECKGLERROR
 376 //      glDepthMask(1);CHECKGLERROR
 377 }
 378
 379 static int mesh_blendfunc1;
 380 static int mesh_blendfunc2;
 381 static int mesh_blend;
 382 static GLboolean mesh_depthmask;
 383 static int mesh_depthtest;
 384 static int mesh_unit;
 385 static int mesh_clientunit;
 386 static int mesh_texture[MAX_TEXTUREUNITS];
 387 static float mesh_texturergbscale[MAX_TEXTUREUNITS];
 388
 389 void GL_SetupTextureState(void)
 390 {
 391         int i;
 392         if (backendunits > 1)
 393         {
 394                 for (i = 0;i < backendunits;i++)
 395                 {
 396                         qglActiveTexture(GL_TEXTURE0_ARB + (mesh_unit = i));CHECKGLERROR
 397                         glBindTexture(GL_TEXTURE_2D, mesh_texture[i]);CHECKGLERROR
 398                         if (gl_combine.integer)
 399                         {
 400                                 glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);CHECKGLERROR
 401                                 glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_MODULATE);CHECKGLERROR
 402                                 glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE);CHECKGLERROR
 403                                 glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 404                                 glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_RGB_ARB, GL_CONSTANT_ARB);CHECKGLERROR
 405                                 glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 406                                 glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 407                                 glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_RGB_ARB, GL_SRC_ALPHA);CHECKGLERROR
 408                                 glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, GL_MODULATE);CHECKGLERROR
 409                                 glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA_ARB, GL_TEXTURE);CHECKGLERROR
 410                                 glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_ALPHA_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 411                                 glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_ALPHA_ARB, GL_CONSTANT_ARB);CHECKGLERROR
 412                                 glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 413                                 glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 414                                 glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 415                                 glTexEnvf(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, mesh_texturergbscale[i]);CHECKGLERROR
 416                                 glTexEnvf(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1.0f);CHECKGLERROR
 417                         }
 418                         else
 419                         {
 420                                 glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 421                         }
 422                         qglClientActiveTexture(GL_TEXTURE0_ARB + (mesh_clientunit = i));CHECKGLERROR
 423                         glTexCoordPointer(2, GL_FLOAT, sizeof(buf_texcoord_t), buf_texcoord[i]);CHECKGLERROR
 424                         if (mesh_texture[i])
 425                         {
 426                                 glEnable(GL_TEXTURE_2D);CHECKGLERROR
 427                                 glEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 428                         }
 429                         else
 430                         {
 431                                 glDisable(GL_TEXTURE_2D);CHECKGLERROR
 432                                 glDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 433                         }
 434                 }
 435         }
 436         else
 437         {
 438                 glBindTexture(GL_TEXTURE_2D, mesh_texture[0]);CHECKGLERROR
 439                 glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 440                 glTexCoordPointer(2, GL_FLOAT, sizeof(buf_texcoord_t), buf_texcoord[0]);CHECKGLERROR
 441                 if (mesh_texture[0])
 442                 {
 443                         glEnable(GL_TEXTURE_2D);CHECKGLERROR
 444                         glEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 445                 }
 446                 else
 447                 {
 448                         glDisable(GL_TEXTURE_2D);CHECKGLERROR
 449                         glDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 450                 }
 451         }
 452 }
 453
 454 // called at beginning of frame
 455 void R_Mesh_Start(void)
 456 {
 457         int i;
 458         if (!backendactive)
 459                 Sys_Error("R_Mesh_Clear: called when backend is not active\n");
 460
 461         CHECKGLERROR
 462
 463         gl_backend_bufferchanges(false);
 464
 465         currentmesh = 0;
 466         currenttriangle = 0;
 467         currentvertex = 0;
 468         currenttransmesh = 0;
 469         currenttranstriangle = 0;
 470         currenttransvertex = 0;
 471         meshfarclip = 0;
 472         transranout = false;
 473         viewdist = DotProduct(r_origin, vpn);
 474
 475         c_meshs = 0;
 476         c_meshtris = 0;
 477         c_transmeshs = 0;
 478         c_transtris = 0;
 479
 480         GL_SetupFrame();
 481
 482         mesh_unit = 0;
 483         mesh_clientunit = 0;
 484
 485         for (i = 0;i < backendunits;i++)
 486         {
 487                 mesh_texture[i] = 0;
 488                 mesh_texturergbscale[i] = 1;
 489         }
 490
 491         glEnable(GL_CULL_FACE);CHECKGLERROR
 492         glCullFace(GL_FRONT);CHECKGLERROR
 493
 494         mesh_depthtest = true;
 495         glEnable(GL_DEPTH_TEST);CHECKGLERROR
 496
 497         mesh_blendfunc1 = GL_ONE;
 498         mesh_blendfunc2 = GL_ZERO;
 499         glBlendFunc(mesh_blendfunc1, mesh_blendfunc2);CHECKGLERROR
 500
 501         mesh_blend = 0;
 502         glDisable(GL_BLEND);CHECKGLERROR
 503
 504         mesh_depthmask = GL_TRUE;
 505         glDepthMask(mesh_depthmask);CHECKGLERROR
 506
 507         glVertexPointer(3, GL_FLOAT, sizeof(buf_vertex_t), &buf_vertex[0].v[0]);CHECKGLERROR
 508         glEnableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 509         if (gl_mesh_floatcolors.integer)
 510         {
 511                 glColorPointer(4, GL_FLOAT, sizeof(buf_fcolor_t), &buf_fcolor[0].c[0]);CHECKGLERROR
 512         }
 513         else
 514         {
 515                 glColorPointer(4, GL_UNSIGNED_BYTE, sizeof(buf_bcolor_t), &buf_bcolor[0].c[0]);CHECKGLERROR
 516         }
 517         glEnableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 518
 519         GL_SetupTextureState();
 520 }
 521
 522 int gl_backend_rebindtextures;
 523
 524 void GL_UpdateFarclip(void)
 525 {
 526         int i;
 527         float farclip;
 528
 529         // push out farclip based on vertices
 530         // FIXME: wouldn't this be slow when using matrix transforms?
 531         for (i = 0;i < currentvertex;i++)
 532         {
 533                 farclip = DotProduct(buf_vertex[i].v, vpn);
 534                 if (meshfarclip < farclip)
 535                         meshfarclip = farclip;
 536         }
 537
 538         farclip = meshfarclip + 256.0f - viewdist; // + 256 just to be safe
 539
 540         // push out farclip for next frame
 541         if (farclip > r_newfarclip)
 542                 r_newfarclip = ceil((farclip + 255) / 256) * 256 + 256;
 543 }
 544
 545 void GL_ConvertColorsFloatToByte(void)
 546 {
 547         int i, k, *icolor;
 548         float *fcolor;
 549         qbyte *bcolor;
 550
 551         // shift float to have 8bit fraction at base of number
 552         for (i = 0, fcolor = &buf_fcolor->c[0];i < currentvertex;i++)
 553         {
 554                 *fcolor++ += 32768.0f;
 555                 *fcolor++ += 32768.0f;
 556                 *fcolor++ += 32768.0f;
 557                 *fcolor++ += 32768.0f;
 558         }
 559         // then read as integer and kill float bits...
 560         for (i = 0, icolor = (int *)&buf_fcolor->c[0], bcolor = &buf_bcolor->c[0];i < currentvertex;i++)
 561         {
 562                 k = (*icolor++) & 0x7FFFFF;*bcolor++ = k > 255 ? 255 : k;
 563                 k = (*icolor++) & 0x7FFFFF;*bcolor++ = k > 255 ? 255 : k;
 564                 k = (*icolor++) & 0x7FFFFF;*bcolor++ = k > 255 ? 255 : k;
 565                 k = (*icolor++) & 0x7FFFFF;*bcolor++ = k > 255 ? 255 : k;
 566         }
 567 }
 568
 569 void GL_MeshState(buf_mesh_t *mesh)
 570 {
 571         int i;
 572         if (backendunits > 1)
 573         {
 574                 for (i = 0;i < backendunits;i++)
 575                 {
 576                         if (mesh_texture[i] != mesh->textures[i])
 577                         {
 578                                 if (mesh_unit != i)
 579                                 {
 580                                         qglActiveTexture(GL_TEXTURE0_ARB + (mesh_unit = i));CHECKGLERROR
 581                                 }
 582                                 if (mesh_texture[i] == 0)
 583                                 {
 584                                         glEnable(GL_TEXTURE_2D);CHECKGLERROR
 585                                         // have to disable texcoord array on disabled texture
 586                                         // units due to NVIDIA driver bug with
 587                                         // compiled_vertex_array
 588                                         if (mesh_clientunit != i)
 589                                         {
 590                                                 qglClientActiveTexture(GL_TEXTURE0_ARB + (mesh_clientunit = i));CHECKGLERROR
 591                                         }
 592                                         glEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 593                                 }
 594                                 glBindTexture(GL_TEXTURE_2D, (mesh_texture[i] = mesh->textures[i]));CHECKGLERROR
 595                                 if (mesh_texture[i] == 0)
 596                                 {
 597                                         glDisable(GL_TEXTURE_2D);CHECKGLERROR
 598                                         // have to disable texcoord array on disabled texture
 599                                         // units due to NVIDIA driver bug with
 600                                         // compiled_vertex_array
 601                                         if (mesh_clientunit != i)
 602                                         {
 603                                                 qglClientActiveTexture(GL_TEXTURE0_ARB + (mesh_clientunit = i));CHECKGLERROR
 604                                         }
 605                                         glDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 606                                 }
 607                         }
 608                         if (mesh_texturergbscale[i] != mesh->texturergbscale[i])
 609                         {
 610                                 if (mesh_unit != i)
 611                                 {
 612                                         qglActiveTexture(GL_TEXTURE0_ARB + (mesh_unit = i));CHECKGLERROR
 613                                 }
 614                                 glTexEnvf(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, (mesh_texturergbscale[i] = mesh->texturergbscale[i]));CHECKGLERROR
 615                         }
 616                 }
 617         }
 618         else
 619         {
 620                 if (mesh_texture[0] != mesh->textures[0])
 621                 {
 622                         if (mesh_texture[0] == 0)
 623                         {
 624                                 glEnable(GL_TEXTURE_2D);CHECKGLERROR
 625                                 glEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 626                         }
 627                         glBindTexture(GL_TEXTURE_2D, (mesh_texture[0] = mesh->textures[0]));CHECKGLERROR
 628                         if (mesh_texture[0] == 0)
 629                         {
 630                                 glDisable(GL_TEXTURE_2D);CHECKGLERROR
 631                                 glDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 632                         }
 633                 }
 634         }
 635         if (mesh_blendfunc1 != mesh->blendfunc1 || mesh_blendfunc2 != mesh->blendfunc2)
 636         {
 637                 glBlendFunc(mesh_blendfunc1 = mesh->blendfunc1, mesh_blendfunc2 = mesh->blendfunc2);CHECKGLERROR
 638                 if (mesh_blendfunc2 == GL_ZERO)
 639                 {
 640                         if (mesh_blendfunc1 == GL_ONE)
 641                         {
 642                                 if (mesh_blend)
 643                                 {
 644                                         mesh_blend = 0;
 645                                         glDisable(GL_BLEND);CHECKGLERROR
 646                                 }
 647                         }
 648                         else
 649                         {
 650                                 if (!mesh_blend)
 651                                 {
 652                                         mesh_blend = 1;
 653                                         glEnable(GL_BLEND);CHECKGLERROR
 654                                 }
 655                         }
 656                 }
 657                 else
 658                 {
 659                         if (!mesh_blend)
 660                         {
 661                                 mesh_blend = 1;
 662                                 glEnable(GL_BLEND);CHECKGLERROR
 663                         }
 664                 }
 665         }
 666         if (mesh_depthtest != mesh->depthtest)
 667         {
 668                 mesh_depthtest = mesh->depthtest;
 669                 if (mesh_depthtest)
 670                         glEnable(GL_DEPTH_TEST);
 671                 else
 672                         glDisable(GL_DEPTH_TEST);
 673         }
 674         if (mesh_depthmask != mesh->depthmask)
 675         {
 676                 glDepthMask(mesh_depthmask = mesh->depthmask);CHECKGLERROR
 677         }
 678 }
 679
 680 // renders mesh buffers, called to flush buffers when full
 681 void R_Mesh_Render(void)
 682 {
 683         int i;
 684         int k;
 685         int indexcount;
 686         int firstvert;
 687         buf_mesh_t *mesh;
 688         unsigned int *index;
 689
 690         if (!backendactive)
 691                 Sys_Error("R_Mesh_Render: called when backend is not active\n");
 692
 693         if (!currentmesh)
 694                 return;
 695
 696         CHECKGLERROR
 697
 698         GL_UpdateFarclip();
 699
 700         if (!gl_mesh_floatcolors.integer)
 701                 GL_ConvertColorsFloatToByte();
 702
 703         // lock the arrays now that they will have no further modifications
 704         //GL_LockArray(0, currentvertex);CHECKGLERROR
 705         if (gl_backend_rebindtextures)
 706         {
 707                 gl_backend_rebindtextures = false;
 708                 GL_SetupTextureState();
 709         }
 710
 711         GL_MeshState(buf_mesh);
 712         GL_LockArray(0, currentvertex);
 713         #ifdef WIN32
 714         // FIXME: dynamic link to GL so we can get DrawRangeElements on WIN32
 715         glDrawElements(GL_TRIANGLES, buf_mesh->triangles * 3, GL_UNSIGNED_INT, (unsigned int *)&buf_tri[buf_mesh->firsttriangle].index[0]);CHECKGLERROR
 716         #else
 717         glDrawRangeElements(GL_TRIANGLES, buf_mesh->firstvert, buf_mesh->firstvert + buf_mesh->verts, buf_mesh->triangles * 3, GL_UNSIGNED_INT, (unsigned int *)&buf_tri[buf_mesh->firsttriangle].index[0]);CHECKGLERROR
 718         #endif
 719
 720         if (currentmesh >= 2)
 721         {
 722                 for (k = 1, mesh = buf_mesh + k;k < currentmesh;k++, mesh++)
 723                 {
 724                         GL_MeshState(mesh);
 725
 726                         firstvert = mesh->firstvert;
 727                         indexcount = mesh->triangles * 3;
 728                         index = (unsigned int *)&buf_tri[mesh->firsttriangle].index[0];
 729
 730                         // if not using batching, skip the index adjustment
 731                         if (firstvert != 0)
 732                                 for (i = 0;i < indexcount;i++)
 733                                         index[i] += firstvert;
 734
 735                         #ifdef WIN32
 736                         // FIXME: dynamic link to GL so we can get DrawRangeElements on WIN32
 737                         glDrawElements(GL_TRIANGLES, indexcount, GL_UNSIGNED_INT, index);CHECKGLERROR
 738                         #else
 739                         glDrawRangeElements(GL_TRIANGLES, firstvert, firstvert + mesh->verts, indexcount, GL_UNSIGNED_INT, index);CHECKGLERROR
 740                         #endif
 741                 }
 742         }
 743
 744         currentmesh = 0;
 745         currenttriangle = 0;
 746         currentvertex = 0;
 747
 748         GL_UnlockArray();CHECKGLERROR
 749 }
 750
 751 // restores backend state, used when done with 3D rendering
 752 void R_Mesh_Finish(void)
 753 {
 754         int i;
 755         // flush any queued meshs
 756         R_Mesh_Render();
 757
 758         if (backendunits > 1)
 759         {
 760                 for (i = backendunits - 1;i >= 0;i--)
 761                 {
 762                         qglActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
 763                         glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 764                         if (gl_combine.integer)
 765                         {
 766                                 glTexEnvf(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1.0f);CHECKGLERROR
 767                         }
 768                         if (i > 0)
 769                         {
 770                                 glDisable(GL_TEXTURE_2D);CHECKGLERROR
 771                         }
 772                         else
 773                         {
 774                                 glEnable(GL_TEXTURE_2D);CHECKGLERROR
 775                         }
 776                         glBindTexture(GL_TEXTURE_2D, 0);CHECKGLERROR
 777
 778                         qglClientActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
 779                         glDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 780                 }
 781         }
 782         else
 783         {
 784                 glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 785                 glEnable(GL_TEXTURE_2D);CHECKGLERROR
 786                 glDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 787         }
 788         glDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 789         glDisableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 790
 791         glDisable(GL_BLEND);CHECKGLERROR
 792         glEnable(GL_DEPTH_TEST);CHECKGLERROR
 793         glDepthMask(true);CHECKGLERROR
 794         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);CHECKGLERROR
 795 }
 796
 797 void R_Mesh_ClearDepth(void)
 798 {
 799         R_Mesh_AddTransparent();
 800         R_Mesh_Finish();
 801         glClear(GL_DEPTH_BUFFER_BIT);
 802         R_Mesh_Start();
 803 }
 804
 805 void R_Mesh_AddTransparent(void)
 806 {
 807         int i, j, k, *index;
 808         float viewdistcompare, centerscaler, dist1, dist2, dist3, center, maxdist;
 809         buf_vertex_t *vert1, *vert2, *vert3;
 810         buf_transtri_t *tri;
 811         buf_mesh_t *mesh, *transmesh;
 812
 813         if (!currenttransmesh)
 814                 return;
 815
 816         // convert index data to transtris for sorting
 817         for (j = 0;j < currenttransmesh;j++)
 818         {
 819                 mesh = buf_transmesh + j;
 820                 k = mesh->firsttriangle;
 821                 index = &buf_transtri[k].index[0];
 822                 for (i = 0;i < mesh->triangles;i++)
 823                 {
 824                         tri = &buf_sorttranstri[k++];
 825                         tri->mesh = mesh;
 826                         tri->index[0] = *index++;
 827                         tri->index[1] = *index++;
 828                         tri->index[2] = *index++;
 829                 }
 830         }
 831
 832         // map farclip to 0-4095 list range
 833         centerscaler = (TRANSDEPTHRES / r_farclip) * (1.0f / 3.0f);
 834         viewdistcompare = viewdist + 4.0f;
 835
 836         memset(buf_sorttranstri_list, 0, TRANSDEPTHRES * sizeof(buf_transtri_t *));
 837
 838         k = 0;
 839         for (j = 0;j < currenttranstriangle;j++)
 840         {
 841                 tri = &buf_sorttranstri[j];
 842                 i = tri->mesh->firstvert;
 843
 844                 vert1 = &buf_transvertex[tri->index[0] + i];
 845                 vert2 = &buf_transvertex[tri->index[1] + i];
 846                 vert3 = &buf_transvertex[tri->index[2] + i];
 847
 848                 dist1 = DotProduct(vert1->v, vpn);
 849                 dist2 = DotProduct(vert2->v, vpn);
 850                 dist3 = DotProduct(vert3->v, vpn);
 851
 852                 maxdist = max(dist1, max(dist2, dist3));
 853                 if (maxdist < viewdistcompare)
 854                         continue;
 855
 856                 center = (dist1 + dist2 + dist3) * centerscaler - viewdist;
 857 #if SLOWMATH
 858                 i = (int) center;
 859                 i = bound(0, i, (TRANSDEPTHRES - 1));
 860 #else
 861                 if (center < 0.0f)
 862                         center = 0.0f;
 863                 center += 8388608.0f;
 864                 i = *((long *)&center) & 0x7FFFFF;
 865                 i = min(i, (TRANSDEPTHRES - 1));
 866 #endif
 867                 tri->next = buf_sorttranstri_list[i];
 868                 buf_sorttranstri_list[i] = tri;
 869                 k++;
 870         }
 871
 872         for (i = 0;i < currenttransmesh;i++)
 873                 buf_transmesh[i].transchain = NULL;
 874         transmesh = NULL;
 875         for (j = 0;j < TRANSDEPTHRES;j++)
 876         {
 877                 if ((tri = buf_sorttranstri_list[j]))
 878                 {
 879                         for (;tri;tri = tri->next)
 880                         {
 881                                 if (!tri->mesh->transchain)
 882                                 {
 883                                         tri->mesh->chain = transmesh;
 884                                         transmesh = tri->mesh;
 885                                 }
 886                                 tri->meshsortchain = tri->mesh->transchain;
 887                                 tri->mesh->transchain = tri;
 888                         }
 889                 }
 890         }
 891
 892         for (;transmesh;transmesh = transmesh->chain)
 893         {
 894                 if (currentmesh >= max_meshs || currenttriangle + transmesh->triangles > max_batch || currentvertex + transmesh->verts > max_verts)
 895                         R_Mesh_Render();
 896
 897                 mesh = &buf_mesh[currentmesh++];
 898                 *mesh = *transmesh; // copy mesh properties
 899
 900                 mesh->firstvert = currentvertex;
 901                 memcpy(&buf_vertex[currentvertex], &buf_transvertex[transmesh->firstvert], transmesh->verts * sizeof(buf_vertex_t));
 902                 memcpy(&buf_fcolor[currentvertex], &buf_transfcolor[transmesh->firstvert], transmesh->verts * sizeof(buf_fcolor_t));
 903                 for (i = 0;i < backendunits && transmesh->textures[i];i++)
 904                         memcpy(&buf_texcoord[i][currentvertex], &buf_transtexcoord[i][transmesh->firstvert], transmesh->verts * sizeof(buf_texcoord_t));
 905                 currentvertex += mesh->verts;
 906
 907                 mesh->firsttriangle = currenttriangle;
 908                 for (tri = transmesh->transchain;tri;tri = tri->meshsortchain)
 909                 {
 910                         buf_tri[currenttriangle].index[0] = tri->index[0];
 911                         buf_tri[currenttriangle].index[1] = tri->index[1];
 912                         buf_tri[currenttriangle].index[2] = tri->index[2];
 913                         currenttriangle++;
 914                 }
 915                 mesh->triangles = currenttriangle - mesh->firsttriangle;
 916         }
 917
 918         currenttransmesh = 0;
 919         currenttranstriangle = 0;
 920         currenttransvertex = 0;
 921 }
 922
 923 void R_Mesh_Draw(const rmeshinfo_t *m)
 924 {
 925         // these are static because gcc runs out of virtual registers otherwise
 926         static int i, j, overbright, *index;
 927         static float *in, scaler;
 928         static float cr, cg, cb, ca;
 929         static buf_mesh_t *mesh;
 930         static buf_vertex_t *vert;
 931         static buf_fcolor_t *fcolor;
 932         static buf_texcoord_t *texcoord[MAX_TEXTUREUNITS];
 933
 934         if (!backendactive)
 935                 Sys_Error("R_Mesh_Draw: called when backend is not active\n");
 936
 937         if (m->index == NULL
 938          || !m->numtriangles
 939          || m->vertex == NULL
 940          || !m->numverts)
 941                 Host_Error("R_Mesh_Draw: no triangles or verts\n");
 942
 943         // ignore meaningless alpha meshs
 944         if (!m->depthwrite && m->blendfunc1 == GL_SRC_ALPHA && (m->blendfunc2 == GL_ONE || m->blendfunc2 == GL_ONE_MINUS_SRC_ALPHA))
 945         {
 946                 if (m->color)
 947                 {
 948                         for (i = 0, in = m->color + 3;i < m->numverts;i++, (int)in += m->colorstep)
 949                                 if (*in >= 0.01f)
 950                                         break;
 951                         if (i == m->numverts)
 952                                 return;
 953                 }
 954                 else if (m->ca < 0.01f)
 955                         return;
 956         }
 957
 958         if (!backendactive)
 959                 Sys_Error("R_Mesh_Draw: called when backend is not active\n");
 960
 961 #ifdef DEBUGGL
 962         for (i = 0;i < m->numtriangles * 3;i++)
 963                 if ((unsigned int) m->index[i] >= (unsigned int) m->numverts)
 964                         Host_Error("R_Mesh_Draw: invalid index (%i of %i verts)\n", m->index, m->numverts);
 965 #endif
 966
 967         if (m->transparent)
 968         {
 969                 if (currenttransmesh >= max_meshs || (currenttranstriangle + m->numtriangles) > max_meshs || (currenttransvertex + m->numverts) > max_verts)
 970                 {
 971                         if (!transranout)
 972                         {
 973                                 Con_Printf("R_Mesh_Draw: ran out of room for transparent meshs\n");
 974                                 transranout = true;
 975                         }
 976                         return;
 977                 }
 978
 979                 c_transmeshs++;
 980                 c_transtris += m->numtriangles;
 981                 vert = &buf_transvertex[currenttransvertex];
 982                 fcolor = &buf_transfcolor[currenttransvertex];
 983                 for (i = 0;i < backendunits;i++)
 984                         texcoord[i] = &buf_transtexcoord[i][currenttransvertex];
 985
 986                 // transmesh is only for storage of transparent meshs until they
 987                 // are inserted into the main mesh array
 988                 mesh = &buf_transmesh[currenttransmesh++];
 989                 mesh->firsttriangle = currenttranstriangle;
 990                 mesh->firstvert = currenttransvertex;
 991                 index = &buf_transtri[currenttranstriangle].index[0];
 992
 993                 currenttranstriangle += m->numtriangles;
 994                 currenttransvertex += m->numverts;
 995         }
 996         else
 997         {
 998                 if (m->numtriangles > max_meshs || m->numverts > max_verts)
 999                 {
1000                         Con_Printf("R_Mesh_Draw: mesh too big for buffers\n");
1001                         return;
1002                 }
1003
1004                 if (currentmesh >= max_meshs || (currenttriangle + m->numtriangles) > max_batch || (currentvertex + m->numverts) > max_verts)
1005                         R_Mesh_Render();
1006
1007                 c_meshs++;
1008                 c_meshtris += m->numtriangles;
1009                 vert = &buf_vertex[currentvertex];
1010                 fcolor = &buf_fcolor[currentvertex];
1011                 for (i = 0;i < backendunits;i++)
1012                         texcoord[i] = &buf_texcoord[i][currentvertex];
1013
1014                 // opaque meshs are rendered directly
1015                 mesh = &buf_mesh[currentmesh++];
1016                 mesh->firsttriangle = currenttriangle;
1017                 mesh->firstvert = currentvertex;
1018                 index = &buf_tri[currenttriangle].index[0];
1019
1020                 currenttriangle += m->numtriangles;
1021                 currentvertex += m->numverts;
1022         }
1023
1024         // code shared for transparent and opaque meshs
1025         memcpy(index, m->index, sizeof(int[3]) * m->numtriangles);
1026         mesh->blendfunc1 = m->blendfunc1;
1027         mesh->blendfunc2 = m->blendfunc2;
1028         mesh->depthmask = (m->blendfunc2 == GL_ZERO || m->depthwrite);
1029         mesh->depthtest = !m->depthdisable;
1030         mesh->triangles = m->numtriangles;
1031         mesh->verts = m->numverts;
1032
1033         overbright = false;
1034         scaler = 1;
1035         if (m->blendfunc2 == GL_SRC_COLOR)
1036         {
1037                 if (m->blendfunc1 == GL_DST_COLOR) // 2x modulate with framebuffer
1038                         scaler *= 0.5f;
1039         }
1040         else
1041         {
1042                 if (m->tex[0])
1043                 {
1044                         overbright = gl_combine.integer;
1045                         if (overbright)
1046                                 scaler *= 0.25f;
1047                 }
1048                 scaler *= overbrightscale;
1049         }
1050
1051
1052         j = -1;
1053         for (i = 0;i < backendunits;i++)
1054         {
1055                 if ((mesh->textures[i] = m->tex[i]))
1056                         j = i;
1057                 mesh->texturergbscale[i] = m->texrgbscale[i];
1058                 if (mesh->texturergbscale[i] != 1 && mesh->texturergbscale[i] != 2 && mesh->texturergbscale[i] != 4)
1059                         mesh->texturergbscale[i] = 1;
1060         }
1061         if (overbright && j >= 0)
1062                 mesh->texturergbscale[j] = 4;
1063
1064         if (m->vertexstep != sizeof(buf_vertex_t))
1065         {
1066                 for (i = 0, in = m->vertex;i < m->numverts;i++, (int)in += m->vertexstep)
1067                 {
1068                         vert[i].v[0] = in[0];
1069                         vert[i].v[1] = in[1];
1070                         vert[i].v[2] = in[2];
1071                 }
1072         }
1073         else
1074                 memcpy(vert, m->vertex, m->numverts * sizeof(buf_vertex_t));
1075
1076         if (m->color)
1077         {
1078                 for (i = 0, in = m->color;i < m->numverts;i++, (int)in += m->colorstep)
1079                 {
1080                         fcolor[i].c[0] = in[0] * scaler;
1081                         fcolor[i].c[1] = in[1] * scaler;
1082                         fcolor[i].c[2] = in[2] * scaler;
1083                         fcolor[i].c[3] = in[3];
1084                 }
1085         }
1086         else
1087         {
1088                 cr = m->cr * scaler;
1089                 cg = m->cg * scaler;
1090                 cb = m->cb * scaler;
1091                 ca = m->ca;
1092                 for (i = 0;i < m->numverts;i++)
1093                 {
1094                         fcolor[i].c[0] = cr;
1095                         fcolor[i].c[1] = cg;
1096                         fcolor[i].c[2] = cb;
1097                         fcolor[i].c[3] = ca;
1098                 }
1099         }
1100
1101         for (j = 0;j < MAX_TEXTUREUNITS && m->tex[j];j++)
1102         {
1103                 if (j >= backendunits)
1104                         Sys_Error("R_Mesh_Draw: texture %i supplied when there are only %i texture units\n", j + 1, backendunits);
1105                 if (m->texcoordstep[j] != sizeof(buf_texcoord_t))
1106                 {
1107                         for (i = 0, in = m->texcoords[j];i < m->numverts;i++, (int)in += m->texcoordstep[j])
1108                         {
1109                                 texcoord[j][i].t[0] = in[0];
1110                                 texcoord[j][i].t[1] = in[1];
1111                         }
1112                 }
1113                 else
1114                         memcpy(&texcoord[j][0].t[0], m->texcoords[j], m->numverts * sizeof(buf_texcoord_t));
1115         }
1116         #if 0
1117         for (;j < backendunits;j++)
1118                 memset(&texcoord[j][0].t[0], 0, m->numverts * sizeof(buf_texcoord_t));
1119         #endif
1120 }
1121
1122 void R_Mesh_Draw_NativeOnly(const rmeshinfo_t *m)
1123 {
1124         // these are static because gcc runs out of virtual registers otherwise
1125         static int i, j, overbright, *index;
1126         static float *in, scaler;
1127         static buf_mesh_t *mesh;
1128         static buf_vertex_t *vert;
1129         static buf_fcolor_t *fcolor;
1130         static buf_texcoord_t *texcoord[MAX_TEXTUREUNITS];
1131
1132         if (!backendactive)
1133                 Sys_Error("R_Mesh_Draw: called when backend is not active\n");
1134
1135         if (m->index == NULL
1136          || !m->numtriangles
1137          || m->vertex == NULL
1138          || !m->numverts)
1139                 Host_Error("R_Mesh_Draw: no triangles or verts\n");
1140
1141         // ignore meaningless alpha meshs
1142         if (!m->depthwrite && m->blendfunc1 == GL_SRC_ALPHA && (m->blendfunc2 == GL_ONE || m->blendfunc2 == GL_ONE_MINUS_SRC_ALPHA))
1143         {
1144                 if (m->color)
1145                 {
1146                         for (i = 0, in = m->color + 3;i < m->numverts;i++, (int)in += m->colorstep)
1147                                 if (*in >= 0.01f)
1148                                         break;
1149                         if (i == m->numverts)
1150                                 return;
1151                 }
1152                 else if (m->ca < 0.01f)
1153                         return;
1154         }
1155
1156         if (m->transparent)
1157         {
1158                 if (currenttransmesh >= max_meshs || (currenttranstriangle + m->numtriangles) > max_meshs || (currenttransvertex + m->numverts) > max_verts)
1159                 {
1160                         if (!transranout)
1161                         {
1162                                 Con_Printf("R_Mesh_Draw_NativeOnly: ran out of room for transparent meshs\n");
1163                                 transranout = true;
1164                         }
1165                         return;
1166                 }
1167
1168                 c_transmeshs++;
1169                 c_transtris += m->numtriangles;
1170                 vert = &buf_transvertex[currenttransvertex];
1171                 fcolor = &buf_transfcolor[currenttransvertex];
1172                 for (i = 0;i < backendunits;i++)
1173                         texcoord[i] = &buf_transtexcoord[i][currenttransvertex];
1174
1175                 // transmesh is only for storage of transparent meshs until they
1176                 // are inserted into the main mesh array
1177                 mesh = &buf_transmesh[currenttransmesh++];
1178                 mesh->firsttriangle = currenttranstriangle;
1179                 mesh->firstvert = currenttransvertex;
1180                 index = &buf_transtri[currenttranstriangle].index[0];
1181                 currenttranstriangle += m->numtriangles;
1182                 currenttransvertex += m->numverts;
1183         }
1184         else
1185         {
1186                 if (m->numtriangles > max_meshs || m->numverts > max_verts)
1187                 {
1188                         Con_Printf("R_Mesh_Draw_NativeOnly: mesh too big for buffers\n");
1189                         return;
1190                 }
1191
1192                 if (currentmesh >= max_meshs || (currenttriangle + m->numtriangles) > max_batch || (currentvertex + m->numverts) > max_verts)
1193                         R_Mesh_Render();
1194
1195                 c_meshs++;
1196                 c_meshtris += m->numtriangles;
1197                 vert = &buf_vertex[currentvertex];
1198                 fcolor = &buf_fcolor[currentvertex];
1199                 for (i = 0;i < backendunits;i++)
1200                         texcoord[i] = &buf_texcoord[i][currentvertex];
1201
1202                 // opaque meshs are rendered directly
1203                 mesh = &buf_mesh[currentmesh++];
1204                 mesh->firsttriangle = currenttriangle;
1205                 mesh->firstvert = currentvertex;
1206                 index = &buf_tri[currenttriangle].index[0];
1207                 currenttriangle += m->numtriangles;
1208                 currentvertex += m->numverts;
1209         }
1210
1211         // code shared for transparent and opaque meshs
1212         memcpy(index, m->index, sizeof(int[3]) * m->numtriangles);
1213         mesh->blendfunc1 = m->blendfunc1;
1214         mesh->blendfunc2 = m->blendfunc2;
1215         mesh->depthmask = (m->blendfunc2 == GL_ZERO || m->depthwrite);
1216         mesh->depthtest = !m->depthdisable;
1217         mesh->triangles = m->numtriangles;
1218         mesh->verts = m->numverts;
1219
1220         overbright = false;
1221         scaler = 1;
1222         if (m->blendfunc2 == GL_SRC_COLOR)
1223         {
1224                 if (m->blendfunc1 == GL_DST_COLOR) // 2x modulate with framebuffer
1225                         scaler *= 0.5f;
1226         }
1227         else
1228         {
1229                 if (m->tex[0])
1230                 {
1231                         overbright = gl_combine.integer;
1232                         if (overbright)
1233                                 scaler *= 0.25f;
1234                 }
1235                 scaler *= overbrightscale;
1236         }
1237
1238         j = -1;
1239         for (i = 0;i < backendunits;i++)
1240         {
1241                 if ((mesh->textures[i] = m->tex[i]))
1242                         j = i;
1243                 mesh->texturergbscale[i] = m->texrgbscale[i];
1244                 if (mesh->texturergbscale[i] != 1 && mesh->texturergbscale[i] != 2 && mesh->texturergbscale[i] != 4)
1245                         mesh->texturergbscale[i] = 1;
1246         }
1247         if (overbright && j >= 0)
1248                 mesh->texturergbscale[j] = 4;
1249
1250         if (m->vertexstep != sizeof(buf_vertex_t))
1251                 Host_Error("R_Mesh_Draw_NativeOnly: unsupported vertexstep\n");
1252         if (m->colorstep != sizeof(buf_fcolor_t))
1253                 Host_Error("R_Mesh_Draw_NativeOnly: unsupported colorstep\n");
1254         if (m->color == NULL)
1255                 Host_Error("R_Mesh_Draw_NativeOnly: must provide color array\n");
1256         for (j = 0;j < MAX_TEXTUREUNITS && m->tex[j];j++)
1257         {
1258                 if (j >= backendunits)
1259                         Sys_Error("R_Mesh_Draw_NativeOnly: texture %i supplied when there are only %i texture units\n", j + 1, backendunits);
1260                 if (m->texcoordstep[j] != sizeof(buf_texcoord_t))
1261                         Host_Error("R_Mesh_Draw_NativeOnly: unsupported texcoordstep\n");
1262         }
1263
1264         memcpy(vert, m->vertex, m->numverts * sizeof(buf_vertex_t));
1265         for (j = 0;j < MAX_TEXTUREUNITS && m->tex[j];j++)
1266                 memcpy(&texcoord[j][0].t[0], m->texcoords[j], m->numverts * sizeof(buf_texcoord_t));
1267         #if 0
1268         for (;j < backendunits;j++)
1269                 memset(&texcoord[j][0].t[0], 0, m->numverts * sizeof(buf_texcoord_t));
1270         #endif
1271
1272         memcpy(fcolor, m->color, m->numverts * sizeof(buf_fcolor_t));
1273
1274         // do this as a second step because memcpy preloaded the cache, which we can't easily do
1275         if (scaler != 1)
1276         {
1277                 for (i = 0;i < m->numverts;i++)
1278                 {
1279                         fcolor[i].c[0] *= scaler;
1280                         fcolor[i].c[1] *= scaler;
1281                         fcolor[i].c[2] *= scaler;
1282                 }
1283         }
1284 }
1285
1286 // allocates space in geometry buffers, and fills in pointers to the buffers in passsed struct
1287 // (this is used for very high speed rendering, no copying)
1288 int R_Mesh_Draw_GetBuffer(rmeshbufferinfo_t *m)
1289 {
1290         // these are static because gcc runs out of virtual registers otherwise
1291         int i, j, overbright;
1292         float scaler;
1293         buf_mesh_t *mesh;
1294
1295         if (!backendactive)
1296                 Sys_Error("R_Mesh_Draw: called when backend is not active\n");
1297
1298         if (!m->numtriangles
1299          || !m->numverts)
1300                 Host_Error("R_Mesh_Draw: no triangles or verts\n");
1301
1302         if (m->transparent)
1303         {
1304                 if (currenttransmesh >= max_meshs || (currenttranstriangle + m->numtriangles) > max_meshs || (currenttransvertex + m->numverts) > max_verts)
1305                 {
1306                         if (!transranout)
1307                         {
1308                                 Con_Printf("R_Mesh_Draw: ran out of room for transparent meshs\n");
1309                                 transranout = true;
1310                         }
1311                         return false;
1312                 }
1313
1314                 c_transmeshs++;
1315                 c_transtris += m->numtriangles;
1316                 m->index = &buf_transtri[currenttranstriangle].index[0];
1317                 m->vertex = &buf_transvertex[currenttransvertex].v[0];
1318                 m->color = &buf_transfcolor[currenttransvertex].c[0];
1319                 for (i = 0;i < backendunits;i++)
1320                         m->texcoords[i] = &buf_transtexcoord[i][currenttransvertex].t[0];
1321
1322                 // transmesh is only for storage of transparent meshs until they
1323                 // are inserted into the main mesh array
1324                 mesh = &buf_transmesh[currenttransmesh++];
1325                 mesh->firsttriangle = currenttranstriangle;
1326                 mesh->firstvert = currenttransvertex;
1327                 currenttranstriangle += m->numtriangles;
1328                 currenttransvertex += m->numverts;
1329         }
1330         else
1331         {
1332                 if (m->numtriangles > max_meshs || m->numverts > max_verts)
1333                 {
1334                         Con_Printf("R_Mesh_Draw_GetBuffer: mesh too big for buffers\n");
1335                         return false;
1336                 }
1337
1338                 if (currentmesh >= max_meshs || (currenttriangle + m->numtriangles) > max_batch || (currentvertex + m->numverts) > max_verts)
1339                         R_Mesh_Render();
1340
1341                 c_meshs++;
1342                 c_meshtris += m->numtriangles;
1343                 m->index = &buf_tri[currenttriangle].index[0];
1344                 m->vertex = &buf_vertex[currentvertex].v[0];
1345                 m->color = &buf_fcolor[currentvertex].c[0];
1346                 for (i = 0;i < backendunits;i++)
1347                         m->texcoords[i] = &buf_texcoord[i][currentvertex].t[0];
1348
1349                 // opaque meshs are rendered directly
1350                 mesh = &buf_mesh[currentmesh++];
1351                 mesh->firsttriangle = currenttriangle;
1352                 mesh->firstvert = currentvertex;
1353                 currenttriangle += m->numtriangles;
1354                 currentvertex += m->numverts;
1355         }
1356
1357         // code shared for transparent and opaque meshs
1358         mesh->blendfunc1 = m->blendfunc1;
1359         mesh->blendfunc2 = m->blendfunc2;
1360         mesh->depthmask = (m->blendfunc2 == GL_ZERO || m->depthwrite);
1361         mesh->depthtest = !m->depthdisable;
1362         mesh->triangles = m->numtriangles;
1363         mesh->verts = m->numverts;
1364
1365         overbright = false;
1366         scaler = 1;
1367         if (m->blendfunc2 == GL_SRC_COLOR)
1368         {
1369                 if (m->blendfunc1 == GL_DST_COLOR) // 2x modulate with framebuffer
1370                         scaler *= 0.5f;
1371         }
1372         else
1373         {
1374                 if (m->tex[0])
1375                 {
1376                         overbright = gl_combine.integer;
1377                         if (overbright)
1378                                 scaler *= 0.25f;
1379                 }
1380                 scaler *= overbrightscale;
1381         }
1382         m->colorscale = scaler;
1383
1384         j = -1;
1385         for (i = 0;i < MAX_TEXTUREUNITS;i++)
1386         {
1387                 if ((mesh->textures[i] = m->tex[i]))
1388                 {
1389                         j = i;
1390                         if (i >= backendunits)
1391                                 Sys_Error("R_Mesh_Draw_GetBuffer: texture %i supplied when there are only %i texture units\n", j + 1, backendunits);
1392                 }
1393                 mesh->texturergbscale[i] = m->texrgbscale[i];
1394                 if (mesh->texturergbscale[i] != 1 && mesh->texturergbscale[i] != 2 && mesh->texturergbscale[i] != 4)
1395                         mesh->texturergbscale[i] = 1;
1396         }
1397         if (overbright && j >= 0)
1398                 mesh->texturergbscale[j] = 4;
1399
1400         return true;
1401 }
1402
1403 void R_Mesh_DrawPolygon(rmeshinfo_t *m, int numverts)
1404 {
1405         m->index = polyindexarray;
1406         m->numverts = numverts;
1407         m->numtriangles = numverts - 2;
1408         if (m->numtriangles < 1)
1409         {
1410                 Con_Printf("R_Mesh_DrawPolygon: invalid vertex count\n");
1411                 return;
1412         }
1413         if (m->numtriangles >= 256)
1414         {
1415                 Con_Printf("R_Mesh_DrawPolygon: only up to 256 triangles (258 verts) supported\n");
1416                 return;
1417         }
1418         R_Mesh_Draw(m);
1419 }
1420
1421 /*
1422 ==============================================================================
1423
1424                                                 SCREEN SHOTS
1425
1426 ==============================================================================
1427 */
1428
1429 void SCR_ScreenShot(char *filename, int x, int y, int width, int height)
1430 {
1431         int i;
1432         qbyte *buffer;
1433
1434         if (!r_render.integer)
1435                 return;
1436
1437         buffer = Mem_Alloc(tempmempool, width*height*3);
1438         glReadPixels (x, y, width, height, GL_RGB, GL_UNSIGNED_BYTE, buffer);
1439         CHECKGLERROR
1440
1441         // LordHavoc: compensate for v_overbrightbits when using hardware gamma
1442         if (v_hwgamma.integer)
1443                 for (i = 0;i < width * height * 3;i++)
1444                         buffer[i] <<= v_overbrightbits.integer;
1445
1446         Image_WriteTGARGB_preflipped(filename, width, height, buffer);
1447
1448         Mem_Free(buffer);
1449 }
1450
1451 //=============================================================================
1452
1453 void R_ClearScreen(void)
1454 {
1455         if (r_render.integer)
1456         {
1457                 // clear to black
1458                 glClearColor(0,0,0,0);CHECKGLERROR
1459                 // clear the screen
1460                 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);CHECKGLERROR
1461                 // set dithering mode
1462                 if (gl_dither.integer)
1463                 {
1464                         glEnable(GL_DITHER);CHECKGLERROR
1465                 }
1466                 else
1467                 {
1468                         glDisable(GL_DITHER);CHECKGLERROR
1469                 }
1470         }
1471 }
1472
1473 /*
1474 ==================
1475 SCR_UpdateScreen
1476
1477 This is called every frame, and can also be called explicitly to flush
1478 text to the screen.
1479 ==================
1480 */
1481 void SCR_UpdateScreen (void)
1482 {
1483         //Mem_CheckSentinelsGlobal();
1484         //R_TimeReport("memtest");
1485
1486         VID_Finish ();
1487
1488         R_TimeReport("finish");
1489
1490         if (gl_combine.integer && !gl_combine_extension)
1491                 Cvar_SetValue("gl_combine", 0);
1492
1493         lightscalebit = v_overbrightbits.integer;
1494         if (gl_combine.integer && r_multitexture.integer)
1495                 lightscalebit += 2;
1496
1497         lightscale = 1.0f / (float) (1 << lightscalebit);
1498         overbrightscale = 1.0f / (float) (1 << v_overbrightbits.integer);
1499
1500         R_TimeReport("setup");
1501
1502         R_ClearScreen();
1503
1504         R_TimeReport("clear");
1505
1506         if (scr_conlines < vid.conheight)
1507                 R_RenderView();
1508
1509         // draw 2D stuff
1510         R_DrawQueue();
1511
1512         // tell driver to commit it's partially full geometry queue to the rendering queue
1513         // (this doesn't wait for the commands themselves to complete)
1514         glFlush();
1515 }