gl_backend.c

   1
   2 #include "quakedef.h"
   3 #include "image.h"
   4 #include "jpeg.h"
   5 #include "cl_collision.h"
   6
   7 cvar_t gl_mesh_drawrangeelements = {0, "gl_mesh_drawrangeelements", "1"};
   8 cvar_t gl_mesh_testarrayelement = {0, "gl_mesh_testarrayelement", "0"};
   9 cvar_t gl_mesh_testmanualfeeding = {0, "gl_mesh_testmanualfeeding", "0"};
  10 cvar_t gl_delayfinish = {CVAR_SAVE, "gl_delayfinish", "0"};
  11 cvar_t gl_paranoid = {0, "gl_paranoid", "0"};
  12 cvar_t gl_printcheckerror = {0, "gl_printcheckerror", "0"};
  13
  14 cvar_t r_render = {0, "r_render", "1"};
  15 cvar_t gl_dither = {CVAR_SAVE, "gl_dither", "1"}; // whether or not to use dithering
  16 cvar_t gl_lockarrays = {0, "gl_lockarrays", "1"};
  17
  18 int gl_maxdrawrangeelementsvertices;
  19 int gl_maxdrawrangeelementsindices;
  20
  21 #ifdef DEBUGGL
  22 int errornumber = 0;
  23
  24 void GL_PrintError(int errornumber, char *filename, int linenumber)
  25 {
  26         switch(errornumber)
  27         {
  28 #ifdef GL_INVALID_ENUM
  29         case GL_INVALID_ENUM:
  30                 Con_Printf("GL_INVALID_ENUM at %s:%i\n", filename, linenumber);
  31                 break;
  32 #endif
  33 #ifdef GL_INVALID_VALUE
  34         case GL_INVALID_VALUE:
  35                 Con_Printf("GL_INVALID_VALUE at %s:%i\n", filename, linenumber);
  36                 break;
  37 #endif
  38 #ifdef GL_INVALID_OPERATION
  39         case GL_INVALID_OPERATION:
  40                 Con_Printf("GL_INVALID_OPERATION at %s:%i\n", filename, linenumber);
  41                 break;
  42 #endif
  43 #ifdef GL_STACK_OVERFLOW
  44         case GL_STACK_OVERFLOW:
  45                 Con_Printf("GL_STACK_OVERFLOW at %s:%i\n", filename, linenumber);
  46                 break;
  47 #endif
  48 #ifdef GL_STACK_UNDERFLOW
  49         case GL_STACK_UNDERFLOW:
  50                 Con_Printf("GL_STACK_UNDERFLOW at %s:%i\n", filename, linenumber);
  51                 break;
  52 #endif
  53 #ifdef GL_OUT_OF_MEMORY
  54         case GL_OUT_OF_MEMORY:
  55                 Con_Printf("GL_OUT_OF_MEMORY at %s:%i\n", filename, linenumber);
  56                 break;
  57 #endif
  58 #ifdef GL_TABLE_TOO_LARGE
  59         case GL_TABLE_TOO_LARGE:
  60                 Con_Printf("GL_TABLE_TOO_LARGE at %s:%i\n", filename, linenumber);
  61                 break;
  62 #endif
  63         default:
  64                 Con_Printf("GL UNKNOWN (%i) at %s:%i\n", errornumber, filename, linenumber);
  65                 break;
  66         }
  67 }
  68 #endif
  69
  70 #define BACKENDACTIVECHECK if (!backendactive) Sys_Error("GL backend function called when backend is not active\n");
  71
  72 int c_meshs, c_meshelements;
  73
  74 void SCR_ScreenShot_f (void);
  75
  76 static matrix4x4_t backend_viewmatrix;
  77 static matrix4x4_t backend_modelmatrix;
  78 static matrix4x4_t backend_modelviewmatrix;
  79 static matrix4x4_t backend_glmodelviewmatrix;
  80 static matrix4x4_t backend_projectmatrix;
  81
  82 static int backendunits, backendactive;
  83 static mempool_t *gl_backend_mempool;
  84
  85 /*
  86 note: here's strip order for a terrain row:
  87 0--1--2--3--4
  88 |\ |\ |\ |\ |
  89 | \| \| \| \|
  90 A--B--C--D--E
  91 clockwise
  92
  93 A0B, 01B, B1C, 12C, C2D, 23D, D3E, 34E
  94
  95 *elements++ = i + row;
  96 *elements++ = i;
  97 *elements++ = i + row + 1;
  98 *elements++ = i;
  99 *elements++ = i + 1;
 100 *elements++ = i + row + 1;
 101
 102
 103 for (y = 0;y < rows - 1;y++)
 104 {
 105         for (x = 0;x < columns - 1;x++)
 106         {
 107                 i = y * rows + x;
 108                 *elements++ = i + columns;
 109                 *elements++ = i;
 110                 *elements++ = i + columns + 1;
 111                 *elements++ = i;
 112                 *elements++ = i + 1;
 113                 *elements++ = i + columns + 1;
 114         }
 115 }
 116
 117 alternative:
 118 0--1--2--3--4
 119 | /| /|\ | /|
 120 |/ |/ | \|/ |
 121 A--B--C--D--E
 122 counterclockwise
 123
 124 for (y = 0;y < rows - 1;y++)
 125 {
 126         for (x = 0;x < columns - 1;x++)
 127         {
 128                 i = y * rows + x;
 129                 *elements++ = i;
 130                 *elements++ = i + columns;
 131                 *elements++ = i + columns + 1;
 132                 *elements++ = i + columns;
 133                 *elements++ = i + columns + 1;
 134                 *elements++ = i + 1;
 135         }
 136 }
 137 */
 138
 139 int polygonelements[768];
 140
 141 static void R_Mesh_CacheArray_Startup(void);
 142 static void R_Mesh_CacheArray_Shutdown(void);
 143 void GL_Backend_AllocArrays(void)
 144 {
 145         if (!gl_backend_mempool)
 146                 gl_backend_mempool = Mem_AllocPool("GL_Backend");
 147         R_Mesh_CacheArray_Startup();
 148 }
 149
 150 void GL_Backend_FreeArrays(void)
 151 {
 152         R_Mesh_CacheArray_Shutdown();
 153         Mem_FreePool(&gl_backend_mempool);
 154 }
 155
 156 static void gl_backend_start(void)
 157 {
 158         Con_DPrint("OpenGL Backend started\n");
 159         if (qglDrawRangeElements != NULL)
 160         {
 161                 CHECKGLERROR
 162                 qglGetIntegerv(GL_MAX_ELEMENTS_VERTICES, &gl_maxdrawrangeelementsvertices);
 163                 CHECKGLERROR
 164                 qglGetIntegerv(GL_MAX_ELEMENTS_INDICES, &gl_maxdrawrangeelementsindices);
 165                 CHECKGLERROR
 166                 Con_DPrintf("glDrawRangeElements detected (max vertices %i, max indices %i)\n", gl_maxdrawrangeelementsvertices, gl_maxdrawrangeelementsindices);
 167         }
 168
 169         backendunits = min(MAX_TEXTUREUNITS, gl_textureunits);
 170
 171         GL_Backend_AllocArrays();
 172
 173         backendactive = true;
 174 }
 175
 176 static void gl_backend_shutdown(void)
 177 {
 178         backendunits = 0;
 179         backendactive = false;
 180
 181         Con_DPrint("OpenGL Backend shutting down\n");
 182
 183         GL_Backend_FreeArrays();
 184 }
 185
 186 static void gl_backend_newmap(void)
 187 {
 188 }
 189
 190 cvar_t scr_zoomwindow = {CVAR_SAVE, "scr_zoomwindow", "0"};
 191 cvar_t scr_zoomwindow_viewsizex = {CVAR_SAVE, "scr_zoomwindow_viewsizex", "20"};
 192 cvar_t scr_zoomwindow_viewsizey = {CVAR_SAVE, "scr_zoomwindow_viewsizey", "20"};
 193 cvar_t scr_zoomwindow_fov = {CVAR_SAVE, "scr_zoomwindow_fov", "20"};
 194
 195 void gl_backend_init(void)
 196 {
 197         int i;
 198
 199         for (i = 0;i < POLYGONELEMENTS_MAXPOINTS - 2;i++)
 200         {
 201                 polygonelements[i * 3 + 0] = 0;
 202                 polygonelements[i * 3 + 1] = i + 1;
 203                 polygonelements[i * 3 + 2] = i + 2;
 204         }
 205
 206         Cvar_RegisterVariable(&r_render);
 207         Cvar_RegisterVariable(&gl_dither);
 208         Cvar_RegisterVariable(&gl_lockarrays);
 209         Cvar_RegisterVariable(&gl_delayfinish);
 210         Cvar_RegisterVariable(&gl_paranoid);
 211         Cvar_RegisterVariable(&gl_printcheckerror);
 212 #ifdef NORENDER
 213         Cvar_SetValue("r_render", 0);
 214 #endif
 215
 216         Cvar_RegisterVariable(&gl_mesh_drawrangeelements);
 217         Cvar_RegisterVariable(&gl_mesh_testarrayelement);
 218         Cvar_RegisterVariable(&gl_mesh_testmanualfeeding);
 219
 220         Cvar_RegisterVariable(&scr_zoomwindow);
 221         Cvar_RegisterVariable(&scr_zoomwindow_viewsizex);
 222         Cvar_RegisterVariable(&scr_zoomwindow_viewsizey);
 223         Cvar_RegisterVariable(&scr_zoomwindow_fov);
 224
 225         R_RegisterModule("GL_Backend", gl_backend_start, gl_backend_shutdown, gl_backend_newmap);
 226 }
 227
 228 void GL_SetupView_Orientation_Identity (void)
 229 {
 230         Matrix4x4_CreateIdentity(&backend_viewmatrix);
 231         memset(&backend_modelmatrix, 0, sizeof(backend_modelmatrix));
 232 }
 233
 234 void GL_SetupView_Orientation_FromEntity(matrix4x4_t *matrix)
 235 {
 236         matrix4x4_t tempmatrix, basematrix;
 237         Matrix4x4_Invert_Simple(&tempmatrix, matrix);
 238         Matrix4x4_CreateRotate(&basematrix, -90, 1, 0, 0);
 239         Matrix4x4_ConcatRotate(&basematrix, 90, 0, 0, 1);
 240         Matrix4x4_Concat(&backend_viewmatrix, &basematrix, &tempmatrix);
 241         //Matrix4x4_ConcatRotate(&backend_viewmatrix, -angles[2], 1, 0, 0);
 242         //Matrix4x4_ConcatRotate(&backend_viewmatrix, -angles[0], 0, 1, 0);
 243         //Matrix4x4_ConcatRotate(&backend_viewmatrix, -angles[1], 0, 0, 1);
 244         //Matrix4x4_ConcatTranslate(&backend_viewmatrix, -origin[0], -origin[1], -origin[2]);
 245         memset(&backend_modelmatrix, 0, sizeof(backend_modelmatrix));
 246 }
 247
 248 void GL_SetupView_Mode_Perspective (double fovx, double fovy, double zNear, double zFar)
 249 {
 250         double xmax, ymax;
 251
 252         if (!r_render.integer)
 253                 return;
 254
 255         // set up viewpoint
 256         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 257         qglLoadIdentity();CHECKGLERROR
 258         // pyramid slopes
 259         xmax = zNear * tan(fovx * M_PI / 360.0);
 260         ymax = zNear * tan(fovy * M_PI / 360.0);
 261         // set view pyramid
 262         qglFrustum(-xmax, xmax, -ymax, ymax, zNear, zFar);CHECKGLERROR
 263         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 264         GL_SetupView_Orientation_Identity();
 265 }
 266
 267 void GL_SetupView_Mode_PerspectiveInfiniteFarClip (double fovx, double fovy, double zNear)
 268 {
 269         float nudge, m[16];
 270
 271         if (!r_render.integer)
 272                 return;
 273
 274         // set up viewpoint
 275         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 276         qglLoadIdentity();CHECKGLERROR
 277         // set view pyramid
 278         nudge = 1.0 - 1.0 / (1<<23);
 279         m[ 0] = 1.0 / tan(fovx * M_PI / 360.0);
 280         m[ 1] = 0;
 281         m[ 2] = 0;
 282         m[ 3] = 0;
 283         m[ 4] = 0;
 284         m[ 5] = 1.0 / tan(fovy * M_PI / 360.0);
 285         m[ 6] = 0;
 286         m[ 7] = 0;
 287         m[ 8] = 0;
 288         m[ 9] = 0;
 289         m[10] = -nudge;
 290         m[11] = -1;
 291         m[12] = 0;
 292         m[13] = 0;
 293         m[14] = -2 * zNear * nudge;
 294         m[15] = 0;
 295         qglLoadMatrixf(m);
 296         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 297         GL_SetupView_Orientation_Identity();
 298         backend_projectmatrix.m[0][0] = m[0];
 299         backend_projectmatrix.m[1][0] = m[1];
 300         backend_projectmatrix.m[2][0] = m[2];
 301         backend_projectmatrix.m[3][0] = m[3];
 302         backend_projectmatrix.m[0][1] = m[4];
 303         backend_projectmatrix.m[1][1] = m[5];
 304         backend_projectmatrix.m[2][1] = m[6];
 305         backend_projectmatrix.m[3][1] = m[7];
 306         backend_projectmatrix.m[0][2] = m[8];
 307         backend_projectmatrix.m[1][2] = m[9];
 308         backend_projectmatrix.m[2][2] = m[10];
 309         backend_projectmatrix.m[3][2] = m[11];
 310         backend_projectmatrix.m[0][3] = m[12];
 311         backend_projectmatrix.m[1][3] = m[13];
 312         backend_projectmatrix.m[2][3] = m[14];
 313         backend_projectmatrix.m[3][3] = m[15];
 314 }
 315
 316 void GL_SetupView_Mode_Ortho (double x1, double y1, double x2, double y2, double zNear, double zFar)
 317 {
 318         if (!r_render.integer)
 319                 return;
 320
 321         // set up viewpoint
 322         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 323         qglLoadIdentity();CHECKGLERROR
 324         qglOrtho(x1, x2, y2, y1, zNear, zFar);
 325         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 326         GL_SetupView_Orientation_Identity();
 327 }
 328
 329 typedef struct gltextureunit_s
 330 {
 331         int t1d, t2d, t3d, tcubemap;
 332         int arrayenabled;
 333         int arrayis3d;
 334         const void *pointer_texcoord;
 335         float rgbscale, alphascale;
 336         int combinergb, combinealpha;
 337         // FIXME: add more combine stuff
 338         matrix4x4_t matrix;
 339 }
 340 gltextureunit_t;
 341
 342 static struct
 343 {
 344         int blendfunc1;
 345         int blendfunc2;
 346         int blend;
 347         GLboolean depthmask;
 348         int colormask; // stored as bottom 4 bits: r g b a (3 2 1 0 order)
 349         int depthtest;
 350         int scissortest;
 351         int unit;
 352         int clientunit;
 353         gltextureunit_t units[MAX_TEXTUREUNITS];
 354         float color4f[4];
 355         int lockrange_first;
 356         int lockrange_count;
 357         const void *pointer_vertex;
 358         const void *pointer_color;
 359 }
 360 gl_state;
 361
 362 void GL_SetupTextureState(void)
 363 {
 364         int i;
 365         gltextureunit_t *unit;
 366         gl_state.unit = -1;
 367         gl_state.clientunit = -1;
 368         for (i = 0;i < backendunits;i++)
 369         {
 370                 GL_ActiveTexture(i);
 371                 GL_ClientActiveTexture(i);
 372                 unit = gl_state.units + i;
 373                 unit->t1d = 0;
 374                 unit->t2d = 0;
 375                 unit->t3d = 0;
 376                 unit->tcubemap = 0;
 377                 unit->pointer_texcoord = NULL;
 378                 unit->rgbscale = 1;
 379                 unit->alphascale = 1;
 380                 unit->combinergb = GL_MODULATE;
 381                 unit->combinealpha = GL_MODULATE;
 382
 383                 qglTexCoordPointer(2, GL_FLOAT, sizeof(float[2]), NULL);CHECKGLERROR
 384                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 385
 386                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 387                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 388                 if (gl_texture3d)
 389                 {
 390                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 391                 }
 392                 if (gl_texturecubemap)
 393                 {
 394                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 395                 }
 396                 if (gl_combine.integer)
 397                 {
 398                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);CHECKGLERROR
 399                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_MODULATE);CHECKGLERROR
 400                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE);CHECKGLERROR
 401                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 402                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_RGB_ARB, GL_TEXTURE);CHECKGLERROR // for GL_INTERPOLATE_ARB mode
 403                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 404                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 405                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_RGB_ARB, GL_SRC_ALPHA);CHECKGLERROR
 406                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, GL_MODULATE);CHECKGLERROR
 407                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA_ARB, GL_TEXTURE);CHECKGLERROR
 408                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_ALPHA_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 409                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_ALPHA_ARB, GL_CONSTANT_ARB);CHECKGLERROR
 410                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 411                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 412                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 413                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
 414                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
 415                 }
 416                 else
 417                 {
 418                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 419                 }
 420         }
 421 }
 422
 423 void GL_Backend_ResetState(void)
 424 {
 425         memset(&gl_state, 0, sizeof(gl_state));
 426         gl_state.depthtest = true;
 427         gl_state.blendfunc1 = GL_ONE;
 428         gl_state.blendfunc2 = GL_ZERO;
 429         gl_state.blend = false;
 430         gl_state.depthmask = GL_TRUE;
 431         gl_state.colormask = 15;
 432         gl_state.color4f[0] = gl_state.color4f[1] = gl_state.color4f[2] = gl_state.color4f[3] = 1;
 433         gl_state.lockrange_first = 0;
 434         gl_state.lockrange_count = 0;
 435         gl_state.pointer_vertex = NULL;
 436         gl_state.pointer_color = NULL;
 437
 438         CHECKGLERROR
 439
 440         qglColorMask(1, 1, 1, 1);
 441         qglEnable(GL_CULL_FACE);CHECKGLERROR
 442         qglCullFace(GL_FRONT);CHECKGLERROR
 443         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 444         qglBlendFunc(gl_state.blendfunc1, gl_state.blendfunc2);CHECKGLERROR
 445         qglDisable(GL_BLEND);CHECKGLERROR
 446         qglDepthMask(gl_state.depthmask);CHECKGLERROR
 447
 448         qglVertexPointer(3, GL_FLOAT, sizeof(float[3]), NULL);CHECKGLERROR
 449         qglEnableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 450
 451         qglColorPointer(4, GL_FLOAT, sizeof(float[4]), NULL);CHECKGLERROR
 452         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 453
 454         GL_Color(0, 0, 0, 0);
 455         GL_Color(1, 1, 1, 1);
 456
 457         GL_SetupTextureState();
 458 }
 459
 460 void GL_ActiveTexture(int num)
 461 {
 462         if (gl_state.unit != num)
 463         {
 464                 gl_state.unit = num;
 465                 if (qglActiveTexture)
 466                 {
 467                         qglActiveTexture(GL_TEXTURE0_ARB + gl_state.unit);
 468                         CHECKGLERROR
 469                 }
 470         }
 471 }
 472
 473 void GL_ClientActiveTexture(int num)
 474 {
 475         if (gl_state.clientunit != num)
 476         {
 477                 gl_state.clientunit = num;
 478                 if (qglActiveTexture)
 479                 {
 480                         qglClientActiveTexture(GL_TEXTURE0_ARB + gl_state.clientunit);
 481                         CHECKGLERROR
 482                 }
 483         }
 484 }
 485
 486 void GL_BlendFunc(int blendfunc1, int blendfunc2)
 487 {
 488         if (gl_state.blendfunc1 != blendfunc1 || gl_state.blendfunc2 != blendfunc2)
 489         {
 490                 if (r_showtrispass)
 491                         return;
 492                 qglBlendFunc(gl_state.blendfunc1 = blendfunc1, gl_state.blendfunc2 = blendfunc2);CHECKGLERROR
 493                 if (gl_state.blendfunc2 == GL_ZERO)
 494                 {
 495                         if (gl_state.blendfunc1 == GL_ONE)
 496                         {
 497                                 if (gl_state.blend)
 498                                 {
 499                                         gl_state.blend = 0;
 500                                         qglDisable(GL_BLEND);CHECKGLERROR
 501                                 }
 502                         }
 503                         else
 504                         {
 505                                 if (!gl_state.blend)
 506                                 {
 507                                         gl_state.blend = 1;
 508                                         qglEnable(GL_BLEND);CHECKGLERROR
 509                                 }
 510                         }
 511                 }
 512                 else
 513                 {
 514                         if (!gl_state.blend)
 515                         {
 516                                 gl_state.blend = 1;
 517                                 qglEnable(GL_BLEND);CHECKGLERROR
 518                         }
 519                 }
 520         }
 521 }
 522
 523 void GL_DepthMask(int state)
 524 {
 525         if (gl_state.depthmask != state)
 526         {
 527                 if (r_showtrispass)
 528                         return;
 529                 qglDepthMask(gl_state.depthmask = state);CHECKGLERROR
 530         }
 531 }
 532
 533 void GL_DepthTest(int state)
 534 {
 535         if (gl_state.depthtest != state)
 536         {
 537                 if (r_showtrispass)
 538                         return;
 539                 gl_state.depthtest = state;
 540                 if (gl_state.depthtest)
 541                 {
 542                         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 543                 }
 544                 else
 545                 {
 546                         qglDisable(GL_DEPTH_TEST);CHECKGLERROR
 547                 }
 548         }
 549 }
 550
 551 void GL_ColorMask(int r, int g, int b, int a)
 552 {
 553         int state = r*8 + g*4 + b*2 + a*1;
 554         if (gl_state.colormask != state)
 555         {
 556                 if (r_showtrispass)
 557                         return;
 558                 gl_state.colormask = state;
 559                 qglColorMask((GLboolean)r, (GLboolean)g, (GLboolean)b, (GLboolean)a);CHECKGLERROR
 560         }
 561 }
 562
 563 void GL_Color(float cr, float cg, float cb, float ca)
 564 {
 565         if (gl_state.pointer_color || gl_state.color4f[0] != cr || gl_state.color4f[1] != cg || gl_state.color4f[2] != cb || gl_state.color4f[3] != ca)
 566         {
 567                 if (r_showtrispass)
 568                         return;
 569                 gl_state.color4f[0] = cr;
 570                 gl_state.color4f[1] = cg;
 571                 gl_state.color4f[2] = cb;
 572                 gl_state.color4f[3] = ca;
 573                 CHECKGLERROR
 574                 qglColor4f(gl_state.color4f[0], gl_state.color4f[1], gl_state.color4f[2], gl_state.color4f[3]);
 575                 CHECKGLERROR
 576         }
 577 }
 578
 579 void GL_ShowTrisColor(float cr, float cg, float cb, float ca)
 580 {
 581         if (!r_showtrispass)
 582                 return;
 583         r_showtrispass = false;
 584         GL_Color(cr * r_showtris.value, cg * r_showtris.value, cb * r_showtris.value, ca);
 585         r_showtrispass = true;
 586 }
 587
 588
 589 void GL_LockArrays(int first, int count)
 590 {
 591         if (gl_state.lockrange_count != count || gl_state.lockrange_first != first)
 592         {
 593                 if (gl_state.lockrange_count)
 594                 {
 595                         gl_state.lockrange_count = 0;
 596                         CHECKGLERROR
 597                         qglUnlockArraysEXT();
 598                         CHECKGLERROR
 599                 }
 600                 if (count && gl_supportslockarrays && gl_lockarrays.integer && r_render.integer)
 601                 {
 602                         gl_state.lockrange_first = first;
 603                         gl_state.lockrange_count = count;
 604                         CHECKGLERROR
 605                         qglLockArraysEXT(first, count);
 606                         CHECKGLERROR
 607                 }
 608         }
 609 }
 610
 611 void GL_Scissor (int x, int y, int width, int height)
 612 {
 613         CHECKGLERROR
 614         qglScissor(x, vid.realheight - (y + height),width,height);
 615         CHECKGLERROR
 616 }
 617
 618 void GL_ScissorTest(int state)
 619 {
 620         if(gl_state.scissortest == state)
 621                 return;
 622
 623         CHECKGLERROR
 624         if((gl_state.scissortest = state))
 625                 qglEnable(GL_SCISSOR_TEST);
 626         else
 627                 qglDisable(GL_SCISSOR_TEST);
 628         CHECKGLERROR
 629 }
 630
 631 void GL_Clear(int mask)
 632 {
 633         if (r_showtrispass)
 634                 return;
 635         qglClear(mask);CHECKGLERROR
 636 }
 637
 638 void GL_TransformToScreen(const vec4_t in, vec4_t out)
 639 {
 640         vec4_t temp;
 641         float iw;
 642         Matrix4x4_Transform4 (&backend_viewmatrix, in, temp);
 643         Matrix4x4_Transform4 (&backend_projectmatrix, temp, out);
 644         iw = 1.0f / out[3];
 645         out[0] = r_view_x + (out[0] * iw + 1.0f) * r_view_width * 0.5f;
 646         out[1] = r_view_y + (out[1] * iw + 1.0f) * r_view_height * 0.5f;
 647         out[2] = out[2] * iw;
 648 }
 649
 650 // called at beginning of frame
 651 void R_Mesh_Start(void)
 652 {
 653         BACKENDACTIVECHECK
 654         CHECKGLERROR
 655         GL_Backend_ResetState();
 656 }
 657
 658 int gl_backend_rebindtextures;
 659
 660 void GL_Backend_RenumberElements(int *out, int count, const int *in, int offset)
 661 {
 662         int i;
 663         if (offset)
 664         {
 665                 for (i = 0;i < count;i++)
 666                         *out++ = *in++ + offset;
 667         }
 668         else
 669                 memcpy(out, in, sizeof(*out) * count);
 670 }
 671
 672 // renders triangles using vertices from the active arrays
 673 int paranoidblah = 0;
 674 void R_Mesh_Draw(int numverts, int numtriangles, const int *elements)
 675 {
 676         int numelements = numtriangles * 3;
 677         if (numverts == 0 || numtriangles == 0)
 678         {
 679                 Con_Printf("R_Mesh_Draw(%d, %d, %08p);\n", numverts, numtriangles, elements);
 680                 return;
 681         }
 682         CHECKGLERROR
 683         if (r_showtrispass)
 684         {
 685                 R_Mesh_Draw_ShowTris(numverts, numtriangles, elements);
 686                 return;
 687         }
 688         c_meshs++;
 689         c_meshelements += numelements;
 690         if (gl_paranoid.integer)
 691         {
 692                 int i, j, size;
 693                 const int *p;
 694                 if (!qglIsEnabled(GL_VERTEX_ARRAY))
 695                         Con_Print("R_Mesh_Draw: vertex array not enabled\n");
 696                 for (j = 0, size = numverts * (int)sizeof(float[3]), p = gl_state.pointer_vertex;j < size;j += sizeof(int), p++)
 697                         paranoidblah += *p;
 698                 if (gl_state.pointer_color)
 699                 {
 700                         if (!qglIsEnabled(GL_COLOR_ARRAY))
 701                                 Con_Print("R_Mesh_Draw: color array set but not enabled\n");
 702                         for (j = 0, size = numverts * (int)sizeof(float[4]), p = gl_state.pointer_color;j < size;j += sizeof(int), p++)
 703                                 paranoidblah += *p;
 704                 }
 705                 for (i = 0;i < backendunits;i++)
 706                 {
 707                         if (gl_state.units[i].t1d || gl_state.units[i].t2d || gl_state.units[i].t3d || gl_state.units[i].tcubemap || gl_state.units[i].arrayenabled)
 708                         {
 709                                 if (gl_state.units[i].arrayenabled && !(gl_state.units[i].t1d || gl_state.units[i].t2d || gl_state.units[i].t3d || gl_state.units[i].tcubemap))
 710                                         Con_Print("R_Mesh_Draw: array enabled but no texture bound\n");
 711                                 GL_ActiveTexture(i);
 712                                 if (!qglIsEnabled(GL_TEXTURE_COORD_ARRAY))
 713                                         Con_Print("R_Mesh_Draw: texcoord array set but not enabled\n");
 714                                 for (j = 0, size = numverts * ((gl_state.units[i].t3d || gl_state.units[i].tcubemap) ? (int)sizeof(float[3]) : (int)sizeof(float[2])), p = gl_state.units[i].pointer_texcoord;j < size;j += sizeof(int), p++)
 715                                         paranoidblah += *p;
 716                         }
 717                 }
 718                 for (i = 0;i < numtriangles * 3;i++)
 719                 {
 720                         if (elements[i] < 0 || elements[i] >= numverts)
 721                         {
 722                                 Con_Printf("R_Mesh_Draw: invalid vertex index %i (outside range 0 - %i) in elements list\n", elements[i], numverts);
 723                                 return;
 724                         }
 725                 }
 726                 CHECKGLERROR
 727         }
 728         if (r_render.integer)
 729         {
 730                 CHECKGLERROR
 731                 if (gl_mesh_testmanualfeeding.integer)
 732                 {
 733                         int i, j;
 734                         const GLfloat *p;
 735                         qglBegin(GL_TRIANGLES);
 736                         for (i = 0;i < numtriangles * 3;i++)
 737                         {
 738                                 for (j = 0;j < backendunits;j++)
 739                                 {
 740                                         if (gl_state.units[j].pointer_texcoord)
 741                                         {
 742                                                 if (backendunits > 1)
 743                                                 {
 744                                                         if (gl_state.units[j].t3d || gl_state.units[j].tcubemap)
 745                                                         {
 746                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 3;
 747                                                                 qglMultiTexCoord3f(GL_TEXTURE0_ARB + j, p[0], p[1], p[2]);
 748                                                         }
 749                                                         else
 750                                                         {
 751                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 2;
 752                                                                 qglMultiTexCoord2f(GL_TEXTURE0_ARB + j, p[0], p[1]);
 753                                                         }
 754                                                 }
 755                                                 else
 756                                                 {
 757                                                         if (gl_state.units[j].t3d || gl_state.units[j].tcubemap)
 758                                                         {
 759                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 3;
 760                                                                 qglTexCoord3f(p[0], p[1], p[2]);
 761                                                         }
 762                                                         else
 763                                                         {
 764                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 2;
 765                                                                 qglTexCoord2f(p[0], p[1]);
 766                                                         }
 767                                                 }
 768                                         }
 769                                 }
 770                                 if (gl_state.pointer_color)
 771                                 {
 772                                         p = ((const GLfloat *)(gl_state.pointer_color)) + elements[i] * 4;
 773                                         qglColor4f(p[0], p[1], p[2], p[3]);
 774                                 }
 775                                 p = ((const GLfloat *)(gl_state.pointer_vertex)) + elements[i] * 3;
 776                                 qglVertex3f(p[0], p[1], p[2]);
 777                         }
 778                         qglEnd();
 779                         CHECKGLERROR
 780                 }
 781                 else if (gl_mesh_testarrayelement.integer)
 782                 {
 783                         int i;
 784                         qglBegin(GL_TRIANGLES);
 785                         for (i = 0;i < numtriangles * 3;i++)
 786                         {
 787                                 qglArrayElement(elements[i]);
 788                         }
 789                         qglEnd();
 790                         CHECKGLERROR
 791                 }
 792                 else if (gl_mesh_drawrangeelements.integer && qglDrawRangeElements != NULL)
 793                 {
 794                         qglDrawRangeElements(GL_TRIANGLES, 0, numverts, numelements, GL_UNSIGNED_INT, elements);CHECKGLERROR
 795                 }
 796                 else
 797                 {
 798                         qglDrawElements(GL_TRIANGLES, numelements, GL_UNSIGNED_INT, elements);CHECKGLERROR
 799                 }
 800                 CHECKGLERROR
 801         }
 802 }
 803
 804 // restores backend state, used when done with 3D rendering
 805 void R_Mesh_Finish(void)
 806 {
 807         int i;
 808         BACKENDACTIVECHECK
 809         CHECKGLERROR
 810         GL_LockArrays(0, 0);
 811         CHECKGLERROR
 812
 813         for (i = backendunits - 1;i >= 0;i--)
 814         {
 815                 if (qglActiveTexture)
 816                         qglActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
 817                 if (qglClientActiveTexture)
 818                         qglClientActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
 819                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 820                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 821                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 822                 if (gl_texture3d)
 823                 {
 824                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 825                 }
 826                 if (gl_texturecubemap)
 827                 {
 828                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 829                 }
 830                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 831                 if (gl_combine.integer)
 832                 {
 833                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
 834                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
 835                 }
 836         }
 837         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 838         qglDisableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 839
 840         qglDisable(GL_BLEND);CHECKGLERROR
 841         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 842         qglDepthMask(GL_TRUE);CHECKGLERROR
 843         qglBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);CHECKGLERROR
 844 }
 845
 846 void R_Mesh_Matrix(const matrix4x4_t *matrix)
 847 {
 848         if (memcmp(matrix, &backend_modelmatrix, sizeof(matrix4x4_t)))
 849         {
 850                 backend_modelmatrix = *matrix;
 851                 Matrix4x4_Concat(&backend_modelviewmatrix, &backend_viewmatrix, matrix);
 852                 Matrix4x4_Transpose(&backend_glmodelviewmatrix, &backend_modelviewmatrix);
 853                 qglLoadMatrixf(&backend_glmodelviewmatrix.m[0][0]);
 854         }
 855 }
 856
 857 void R_Mesh_TextureMatrix(int unitnumber, const matrix4x4_t *matrix)
 858 {
 859         if (memcmp(&gl_state.units[unitnumber].matrix, matrix, sizeof(matrix4x4_t)))
 860         {
 861                 matrix4x4_t tempmatrix;
 862                 gl_state.units[unitnumber].matrix = *matrix;
 863                 Matrix4x4_Transpose(&tempmatrix, &gl_state.units[unitnumber].matrix);
 864                 qglMatrixMode(GL_TEXTURE);
 865                 GL_ActiveTexture(unitnumber);
 866                 qglLoadMatrixf(&tempmatrix.m[0][0]);
 867                 qglMatrixMode(GL_MODELVIEW);
 868         }
 869 }
 870
 871 void R_Mesh_State(const rmeshstate_t *m)
 872 {
 873         int i, combinergb, combinealpha, scale, arrayis3d;
 874         gltextureunit_t *unit;
 875
 876         BACKENDACTIVECHECK
 877
 878         if (gl_state.pointer_vertex != m->pointer_vertex)
 879         {
 880                 gl_state.pointer_vertex = m->pointer_vertex;
 881                 CHECKGLERROR
 882                 qglVertexPointer(3, GL_FLOAT, sizeof(float[3]), gl_state.pointer_vertex);
 883                 CHECKGLERROR
 884         }
 885
 886         if (r_showtrispass)
 887                 return;
 888
 889         if (gl_state.pointer_color != m->pointer_color)
 890         {
 891                 CHECKGLERROR
 892                 if (!gl_state.pointer_color)
 893                 {
 894                         qglEnableClientState(GL_COLOR_ARRAY);
 895                         CHECKGLERROR
 896                 }
 897                 else if (!m->pointer_color)
 898                 {
 899                         qglDisableClientState(GL_COLOR_ARRAY);
 900                         CHECKGLERROR
 901                         // when color array is on the glColor gets trashed, set it again
 902                         qglColor4f(gl_state.color4f[0], gl_state.color4f[1], gl_state.color4f[2], gl_state.color4f[3]);
 903                         CHECKGLERROR
 904                 }
 905                 gl_state.pointer_color = m->pointer_color;
 906                 qglColorPointer(4, GL_FLOAT, sizeof(float[4]), gl_state.pointer_color);
 907                 CHECKGLERROR
 908         }
 909
 910         if (gl_backend_rebindtextures)
 911         {
 912                 gl_backend_rebindtextures = false;
 913                 GL_SetupTextureState();
 914         }
 915
 916         for (i = 0, unit = gl_state.units;i < backendunits;i++, unit++)
 917         {
 918                 if (unit->t1d != m->tex1d[i])
 919                 {
 920                         GL_ActiveTexture(i);
 921                         if (m->tex1d[i])
 922                         {
 923                                 if (unit->t1d == 0)
 924                                         qglEnable(GL_TEXTURE_1D);CHECKGLERROR
 925                         }
 926                         else
 927                         {
 928                                 if (unit->t1d)
 929                                         qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 930                         }
 931                         qglBindTexture(GL_TEXTURE_1D, (unit->t1d = m->tex1d[i]));CHECKGLERROR
 932                 }
 933                 if (unit->t2d != m->tex[i])
 934                 {
 935                         GL_ActiveTexture(i);
 936                         if (m->tex[i])
 937                         {
 938                                 if (unit->t2d == 0)
 939                                         qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 940                         }
 941                         else
 942                         {
 943                                 if (unit->t2d)
 944                                         qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 945                         }
 946                         qglBindTexture(GL_TEXTURE_2D, (unit->t2d = m->tex[i]));CHECKGLERROR
 947                 }
 948                 if (unit->t3d != m->tex3d[i])
 949                 {
 950                         GL_ActiveTexture(i);
 951                         if (m->tex3d[i])
 952                         {
 953                                 if (unit->t3d == 0)
 954                                         qglEnable(GL_TEXTURE_3D);CHECKGLERROR
 955                         }
 956                         else
 957                         {
 958                                 if (unit->t3d)
 959                                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 960                         }
 961                         qglBindTexture(GL_TEXTURE_3D, (unit->t3d = m->tex3d[i]));CHECKGLERROR
 962                 }
 963                 if (unit->tcubemap != m->texcubemap[i])
 964                 {
 965                         GL_ActiveTexture(i);
 966                         if (m->texcubemap[i])
 967                         {
 968                                 if (unit->tcubemap == 0)
 969                                         qglEnable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 970                         }
 971                         else
 972                         {
 973                                 if (unit->tcubemap)
 974                                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 975                         }
 976                         qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, (unit->tcubemap = m->texcubemap[i]));CHECKGLERROR
 977                 }
 978                 combinergb = m->texcombinergb[i];
 979                 if (!combinergb)
 980                         combinergb = GL_MODULATE;
 981                 if (unit->combinergb != combinergb)
 982                 {
 983                         GL_ActiveTexture(i);
 984                         unit->combinergb = combinergb;
 985                         if (gl_combine.integer)
 986                         {
 987                                 qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, unit->combinergb);CHECKGLERROR
 988                         }
 989                         else
 990                         {
 991                                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, unit->combinergb);CHECKGLERROR
 992                         }
 993                 }
 994                 combinealpha = m->texcombinealpha[i];
 995                 if (!combinealpha)
 996                         combinealpha = GL_MODULATE;
 997                 if (unit->combinealpha != combinealpha)
 998                 {
 999                         GL_ActiveTexture(i);
1000                         unit->combinealpha = combinealpha;
1001                         if (gl_combine.integer)
1002                         {
1003                                 qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, unit->combinealpha);CHECKGLERROR
1004                         }
1005                 }
1006                 scale = max(m->texrgbscale[i], 1);
1007                 if (unit->rgbscale != scale)
1008                 {
1009                         GL_ActiveTexture(i);
1010                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, (unit->rgbscale = scale));CHECKGLERROR
1011                 }
1012                 scale = max(m->texalphascale[i], 1);
1013                 if (unit->alphascale != scale)
1014                 {
1015                         GL_ActiveTexture(i);
1016                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, (unit->alphascale = scale));CHECKGLERROR
1017                 }
1018                 arrayis3d = unit->t3d || unit->tcubemap;
1019                 if (unit->pointer_texcoord != m->pointer_texcoord[i] || unit->arrayis3d != arrayis3d)
1020                 {
1021                         GL_ClientActiveTexture(i);
1022                         if (m->pointer_texcoord[i])
1023                         {
1024                                 if (!unit->arrayenabled)
1025                                 {
1026                                         unit->arrayenabled = true;
1027                                         qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
1028                                 }
1029                         }
1030                         else
1031                         {
1032                                 if (unit->arrayenabled)
1033                                 {
1034                                         unit->arrayenabled = false;
1035                                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
1036                                 }
1037                         }
1038                         unit->pointer_texcoord = m->pointer_texcoord[i];
1039                         unit->arrayis3d = arrayis3d;
1040                         if (unit->arrayis3d)
1041                                 qglTexCoordPointer(3, GL_FLOAT, sizeof(float[3]), unit->pointer_texcoord);
1042                         else
1043                                 qglTexCoordPointer(2, GL_FLOAT, sizeof(float[2]), unit->pointer_texcoord);
1044                         CHECKGLERROR
1045                 }
1046         }
1047 }
1048
1049 void R_Mesh_Draw_ShowTris(int numverts, int numtriangles, const int *elements)
1050 {
1051         qglBegin(GL_LINES);
1052         for (;numtriangles;numtriangles--, elements += 3)
1053         {
1054                 qglArrayElement(elements[0]);qglArrayElement(elements[1]);
1055                 qglArrayElement(elements[1]);qglArrayElement(elements[2]);
1056                 qglArrayElement(elements[2]);qglArrayElement(elements[0]);
1057         }
1058         qglEnd();
1059         CHECKGLERROR
1060 }
1061
1062 /*
1063 ==============================================================================
1064
1065                                                 SCREEN SHOTS
1066
1067 ==============================================================================
1068 */
1069
1070 qboolean SCR_ScreenShot(char *filename, int x, int y, int width, int height, qboolean jpeg)
1071 {
1072         qboolean ret;
1073         qbyte *buffer;
1074
1075         if (!r_render.integer)
1076                 return false;
1077
1078         buffer = Mem_Alloc(tempmempool, width*height*3);
1079         qglReadPixels (x, y, width, height, GL_RGB, GL_UNSIGNED_BYTE, buffer);
1080         CHECKGLERROR
1081
1082         if (jpeg)
1083                 ret = JPEG_SaveImage_preflipped (filename, width, height, buffer);
1084         else
1085                 ret = Image_WriteTGARGB_preflipped (filename, width, height, buffer);
1086
1087         Mem_Free(buffer);
1088         return ret;
1089 }
1090
1091 //=============================================================================
1092
1093 void R_ClearScreen(void)
1094 {
1095         if (r_render.integer)
1096         {
1097                 // clear to black
1098                 qglClearColor(0,0,0,0);CHECKGLERROR
1099                 qglClearDepth(1);CHECKGLERROR
1100                 if (gl_stencil)
1101                 {
1102                         // LordHavoc: we use a stencil centered around 128 instead of 0,
1103                         // to avoid clamping interfering with strange shadow volume
1104                         // drawing orders
1105                         qglClearStencil(128);CHECKGLERROR
1106                 }
1107                 // clear the screen
1108                 GL_Clear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | (gl_stencil ? GL_STENCIL_BUFFER_BIT : 0));
1109                 // set dithering mode
1110                 if (gl_dither.integer)
1111                 {
1112                         qglEnable(GL_DITHER);CHECKGLERROR
1113                 }
1114                 else
1115                 {
1116                         qglDisable(GL_DITHER);CHECKGLERROR
1117                 }
1118         }
1119 }
1120
1121 /*
1122 ====================
1123 CalcFov
1124 ====================
1125 */
1126 float CalcFov (float fov_x, float width, float height)
1127 {
1128         // calculate vision size and alter by aspect, then convert back to angle
1129         return atan (height / (width / tan(fov_x/360*M_PI))) * 360 / M_PI;
1130 }
1131
1132 /*
1133 ==================
1134 SCR_UpdateScreen
1135
1136 This is called every frame, and can also be called explicitly to flush
1137 text to the screen.
1138 ==================
1139 */
1140 void SCR_UpdateScreen (void)
1141 {
1142         if (gl_delayfinish.integer)
1143         {
1144                 R_Mesh_Finish();
1145                 R_TimeReport("meshfinish");
1146                 VID_Finish();
1147                 R_TimeReport("finish");
1148         }
1149
1150         R_Mesh_Start();
1151
1152         if (r_textureunits.integer > gl_textureunits)
1153                 Cvar_SetValueQuick(&r_textureunits, gl_textureunits);
1154         if (r_textureunits.integer < 1)
1155                 Cvar_SetValueQuick(&r_textureunits, 1);
1156
1157         if (gl_combine.integer && (!gl_combine_extension || r_textureunits.integer < 2))
1158                 Cvar_SetValueQuick(&gl_combine, 0);
1159
1160 showtris:
1161         R_TimeReport("setup");
1162
1163         R_ClearScreen();
1164
1165         R_TimeReport("clear");
1166
1167         if (scr_conlines < vid.conheight && cls.signon == SIGNONS)
1168         {
1169                 float size;
1170                 int contents;
1171
1172                 // bound viewsize
1173                 if (scr_viewsize.value < 30)
1174                         Cvar_Set ("viewsize","30");
1175                 if (scr_viewsize.value > 120)
1176                         Cvar_Set ("viewsize","120");
1177
1178                 // bound field of view
1179                 if (scr_fov.value < 1)
1180                         Cvar_Set ("fov","1");
1181                 if (scr_fov.value > 170)
1182                         Cvar_Set ("fov","170");
1183
1184                 // intermission is always full screen
1185                 if (cl.intermission)
1186                 {
1187                         size = 1;
1188                         sb_lines = 0;
1189                 }
1190                 else
1191                 {
1192                         if (scr_viewsize.value >= 120)
1193                                 sb_lines = 0;           // no status bar at all
1194                         else if (scr_viewsize.value >= 110)
1195                                 sb_lines = 24;          // no inventory
1196                         else
1197                                 sb_lines = 24+16+8;
1198                         size = scr_viewsize.value * (1.0 / 100.0);
1199                         size = min(size, 1);
1200                 }
1201
1202                 r_refdef.width = vid.realwidth * size;
1203                 r_refdef.height = vid.realheight * size;
1204                 r_refdef.x = (vid.realwidth - r_refdef.width)/2;
1205                 r_refdef.y = (vid.realheight - r_refdef.height)/2;
1206
1207                 // LordHavoc: viewzoom (zoom in for sniper rifles, etc)
1208                 r_refdef.fov_x = scr_fov.value * cl.viewzoom;
1209                 r_refdef.fov_y = CalcFov (r_refdef.fov_x, r_refdef.width, r_refdef.height);
1210
1211                 if (cl.worldmodel)
1212                 {
1213                         Mod_CheckLoaded(cl.worldmodel);
1214                         contents = CL_PointSuperContents(r_vieworigin);
1215                         if (contents & SUPERCONTENTS_LIQUIDSMASK)
1216                         {
1217                                 r_refdef.fov_x *= (sin(cl.time * 4.7) * 0.015 + 0.985);
1218                                 r_refdef.fov_y *= (sin(cl.time * 3.0) * 0.015 + 0.985);
1219                         }
1220                 }
1221
1222                 R_RenderView();
1223
1224                 if (scr_zoomwindow.integer)
1225                 {
1226                         float sizex = bound(10, scr_zoomwindow_viewsizex.value, 100) / 100.0;
1227                         float sizey = bound(10, scr_zoomwindow_viewsizey.value, 100) / 100.0;
1228                         r_refdef.width = vid.realwidth * sizex;
1229                         r_refdef.height = vid.realheight * sizey;
1230                         r_refdef.x = (vid.realwidth - r_refdef.width)/2;
1231                         r_refdef.y = 0;
1232                         r_refdef.fov_x = scr_zoomwindow_fov.value;
1233                         r_refdef.fov_y = CalcFov(r_refdef.fov_x, r_refdef.width, r_refdef.height);
1234
1235                         R_RenderView();
1236                 }
1237         }
1238
1239         // draw 2D stuff
1240         R_DrawQueue();
1241
1242         if (r_showtrispass)
1243                 r_showtrispass = false;
1244         else if (r_showtris.value > 0)
1245         {
1246                 rmeshstate_t m;
1247                 GL_BlendFunc(GL_ONE, GL_ONE);
1248                 GL_DepthTest(GL_FALSE);
1249                 GL_DepthMask(GL_FALSE);
1250                 memset(&m, 0, sizeof(m));
1251                 R_Mesh_State(&m);
1252                 r_showtrispass = true;
1253                 GL_ShowTrisColor(0.2,0.2,0.2,1);
1254                 goto showtris;
1255         }
1256
1257         if (gl_delayfinish.integer)
1258         {
1259                 // tell driver to commit it's partially full geometry queue to the rendering queue
1260                 // (this doesn't wait for the commands themselves to complete)
1261                 qglFlush();
1262         }
1263         else
1264         {
1265                 R_Mesh_Finish();
1266                 R_TimeReport("meshfinish");
1267                 VID_Finish();
1268                 R_TimeReport("finish");
1269         }
1270 }
1271
1272
1273 //===========================================================================
1274 // dynamic vertex array buffer subsystem
1275 //===========================================================================
1276
1277 float varray_vertex3f[65536*3];
1278 float varray_color4f[65536*4];
1279 float varray_texcoord2f[4][65536*2];
1280 float varray_texcoord3f[4][65536*3];
1281 float varray_normal3f[65536*3];
1282 int earray_element3i[65536];
1283
1284 //===========================================================================
1285 // vertex array caching subsystem
1286 //===========================================================================
1287
1288 typedef struct rcachearraylink_s
1289 {
1290         struct rcachearraylink_s *next, *prev;
1291         struct rcachearrayitem_s *data;
1292 }
1293 rcachearraylink_t;
1294
1295 typedef struct rcachearrayitem_s
1296 {
1297         // the original request structure
1298         rcachearrayrequest_t request;
1299         // active
1300         int active;
1301         // offset into r_mesh_rcachedata
1302         int offset;
1303         // for linking this into the sequential list
1304         rcachearraylink_t sequentiallink;
1305         // for linking this into the lookup list
1306         rcachearraylink_t hashlink;
1307 }
1308 rcachearrayitem_t;
1309
1310 #define RCACHEARRAY_HASHSIZE 65536
1311 #define RCACHEARRAY_ITEMS 4096
1312 #define RCACHEARRAY_DEFAULTSIZE (4 << 20)
1313
1314 // all active items are linked into this chain in sorted order
1315 static rcachearraylink_t r_mesh_rcachesequentialchain;
1316 // all inactive items are linked into this chain in unknown order
1317 static rcachearraylink_t r_mesh_rcachefreechain;
1318 // all active items are also linked into these chains (using their hashlink)
1319 static rcachearraylink_t r_mesh_rcachechain[RCACHEARRAY_HASHSIZE];
1320
1321 // all items are stored here, whether active or inactive
1322 static rcachearrayitem_t r_mesh_rcacheitems[RCACHEARRAY_ITEMS];
1323
1324 // size of data buffer
1325 static int r_mesh_rcachedata_size = RCACHEARRAY_DEFAULTSIZE;
1326 // data buffer
1327 static qbyte r_mesh_rcachedata[RCACHEARRAY_DEFAULTSIZE];
1328
1329 // current state
1330 static int r_mesh_rcachedata_offset;
1331 static rcachearraylink_t *r_mesh_rcachesequentialchain_current;
1332
1333 static void R_Mesh_CacheArray_Startup(void)
1334 {
1335         int i;
1336         rcachearraylink_t *l;
1337         // prepare all the linked lists
1338         l = &r_mesh_rcachesequentialchain;l->next = l->prev = l;l->data = NULL;
1339         l = &r_mesh_rcachefreechain;l->next = l->prev = l;l->data = NULL;
1340         memset(&r_mesh_rcachechain, 0, sizeof(r_mesh_rcachechain));
1341         for (i = 0;i < RCACHEARRAY_HASHSIZE;i++)
1342         {
1343                 l = &r_mesh_rcachechain[i];
1344                 l->next = l->prev = l;
1345                 l->data = NULL;
1346         }
1347         memset(&r_mesh_rcacheitems, 0, sizeof(r_mesh_rcacheitems));
1348         for (i = 0;i < RCACHEARRAY_ITEMS;i++)
1349         {
1350                 r_mesh_rcacheitems[i].hashlink.data = r_mesh_rcacheitems[i].sequentiallink.data = &r_mesh_rcacheitems[i];
1351                 l = &r_mesh_rcacheitems[i].sequentiallink;
1352                 l->next = &r_mesh_rcachefreechain;
1353                 l->prev = l->next->prev;
1354                 l->next->prev = l->prev->next = l;
1355         }
1356         // clear other state
1357         r_mesh_rcachedata_offset = 0;
1358         r_mesh_rcachesequentialchain_current = &r_mesh_rcachesequentialchain;
1359 }
1360
1361 static void R_Mesh_CacheArray_Shutdown(void)
1362 {
1363 }
1364
1365 /*
1366 static void R_Mesh_CacheArray_ValidateState(int num)
1367 {
1368         rcachearraylink_t *l, *lhead;
1369         lhead = &r_mesh_rcachesequentialchain;
1370         if (r_mesh_rcachesequentialchain_current == lhead)
1371                 return;
1372         for (l = lhead->next;l != lhead;l = l->next)
1373                 if (r_mesh_rcachesequentialchain_current == l)
1374                         return;
1375         Sys_Error("%i", num);
1376 }
1377 */
1378
1379 int R_Mesh_CacheArray(rcachearrayrequest_t *r)
1380 {
1381         rcachearraylink_t *l, *lhead, *lnext;
1382         rcachearrayitem_t *d;
1383         int hashindex, offset, offsetend;
1384
1385         //R_Mesh_CacheArray_ValidateState(3);
1386         // calculate a hashindex to choose a cache chain
1387         r->data = NULL;
1388         hashindex = CRC_Block((void *)r, sizeof(*r)) % RCACHEARRAY_HASHSIZE;
1389
1390         // is it already cached?
1391         for (lhead = &r_mesh_rcachechain[hashindex], l = lhead->next;l != lhead;l = l->next)
1392         {
1393                 if (!memcmp(&l->data->request, r, sizeof(l->data->request)))
1394                 {
1395                         // we have it cached already
1396                         r->data = r_mesh_rcachedata + l->data->offset;
1397                         return false;
1398                 }
1399         }
1400
1401         // we need to add a new cache item, this means finding a place for the new
1402         // data and making sure we have a free item available, lots of work...
1403
1404         // check if buffer needs to wrap
1405         if (r_mesh_rcachedata_offset + r->data_size > r_mesh_rcachedata_size)
1406         {
1407                 /*
1408                 if (r->data_size * 10 > r_mesh_rcachedata_size)
1409                 {
1410                         // realloc whole cache
1411                 }
1412                 */
1413                 // reset back to start
1414                 r_mesh_rcachedata_offset = 0;
1415                 r_mesh_rcachesequentialchain_current = &r_mesh_rcachesequentialchain;
1416         }
1417         offset = r_mesh_rcachedata_offset;
1418         r_mesh_rcachedata_offset += r->data_size;
1419         offsetend = r_mesh_rcachedata_offset;
1420         //R_Mesh_CacheArray_ValidateState(4);
1421
1422         /*
1423         {
1424                 int n;
1425                 for (lhead = &r_mesh_rcachesequentialchain, l = lhead->next, n = 0;l != lhead;l = l->next, n++);
1426                 Con_Printf("R_Mesh_CacheArray: new data range %i:%i, %i items are already linked\n", offset, offsetend, n);
1427         }
1428         */
1429
1430         // make room for the new data (remove old items)
1431         lhead = &r_mesh_rcachesequentialchain;
1432         l = r_mesh_rcachesequentialchain_current;
1433         if (l == lhead)
1434                 l = l->next;
1435         while (l != lhead && l->data->offset < offsetend && l->data->offset + l->data->request.data_size > offset)
1436         {
1437         //r_mesh_rcachesequentialchain_current = l;
1438         //R_Mesh_CacheArray_ValidateState(8);
1439                 lnext = l->next;
1440                 // if at the end of the chain, wrap around
1441                 if (lnext == lhead)
1442                         lnext = lnext->next;
1443         //r_mesh_rcachesequentialchain_current = lnext;
1444         //R_Mesh_CacheArray_ValidateState(10);
1445
1446                 // unlink from sequential chain
1447                 l->next->prev = l->prev;
1448                 l->prev->next = l->next;
1449         //R_Mesh_CacheArray_ValidateState(11);
1450                 // link into free chain
1451                 l->next = &r_mesh_rcachefreechain;
1452                 l->prev = l->next->prev;
1453                 l->next->prev = l->prev->next = l;
1454         //R_Mesh_CacheArray_ValidateState(12);
1455
1456                 l = &l->data->hashlink;
1457                 // unlink from hash chain
1458                 l->next->prev = l->prev;
1459                 l->prev->next = l->next;
1460
1461                 l = lnext;
1462         //r_mesh_rcachesequentialchain_current = l;
1463         //R_Mesh_CacheArray_ValidateState(9);
1464         }
1465         //r_mesh_rcachesequentialchain_current = l;
1466         //R_Mesh_CacheArray_ValidateState(5);
1467         // gobble an extra item if we have no free items available
1468         if (r_mesh_rcachefreechain.next == &r_mesh_rcachefreechain)
1469         {
1470                 lnext = l->next;
1471
1472                 // unlink from sequential chain
1473                 l->next->prev = l->prev;
1474                 l->prev->next = l->next;
1475                 // link into free chain
1476                 l->next = &r_mesh_rcachefreechain;
1477                 l->prev = l->next->prev;
1478                 l->next->prev = l->prev->next = l;
1479
1480                 l = &l->data->hashlink;
1481                 // unlink from hash chain
1482                 l->next->prev = l->prev;
1483                 l->prev->next = l->next;
1484
1485                 l = lnext;
1486         }
1487         r_mesh_rcachesequentialchain_current = l;
1488         //R_Mesh_CacheArray_ValidateState(6);
1489
1490         // now take an item from the free chain
1491         l = r_mesh_rcachefreechain.next;
1492         // set it up
1493         d = l->data;
1494         d->request = *r;
1495         d->offset = offset;
1496         // unlink
1497         l->next->prev = l->prev;
1498         l->prev->next = l->next;
1499         // relink to sequential
1500         l->next = r_mesh_rcachesequentialchain_current->prev;
1501         l->prev = l->next->prev;
1502         while (l->next->data && l->data && l->next->data->offset <= d->offset)
1503         {
1504                 //Con_Print(">\n");
1505                 l->next = l->next->next;
1506                 l->prev = l->prev->next;
1507         }
1508         while (l->prev->data && l->data && l->prev->data->offset >= d->offset)
1509         {
1510                 //Con_Print("<\n");
1511                 l->prev = l->prev->prev;
1512                 l->next = l->next->prev;
1513         }
1514         l->next->prev = l->prev->next = l;
1515         // also link into hash chain
1516         l = &l->data->hashlink;
1517         l->next = &r_mesh_rcachechain[hashindex];
1518         l->prev = l->next->prev;
1519         l->prev->next = l;
1520         l->next->prev = l->prev->next = l;
1521
1522
1523         //r_mesh_rcachesequentialchain_current = d->sequentiallink.next;
1524
1525         //R_Mesh_CacheArray_ValidateState(7);
1526         // and finally set the data pointer
1527         r->data = r_mesh_rcachedata + d->offset;
1528         // and tell the caller to fill the array
1529         return true;
1530 }
1531