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_ColorPointer(NULL);
 455         GL_Color(0, 0, 0, 0);
 456         GL_Color(1, 1, 1, 1);
 457
 458         GL_SetupTextureState();
 459 }
 460
 461 void GL_ActiveTexture(int num)
 462 {
 463         if (gl_state.unit != num)
 464         {
 465                 gl_state.unit = num;
 466                 if (qglActiveTexture)
 467                 {
 468                         qglActiveTexture(GL_TEXTURE0_ARB + gl_state.unit);
 469                         CHECKGLERROR
 470                 }
 471         }
 472 }
 473
 474 void GL_ClientActiveTexture(int num)
 475 {
 476         if (gl_state.clientunit != num)
 477         {
 478                 gl_state.clientunit = num;
 479                 if (qglActiveTexture)
 480                 {
 481                         qglClientActiveTexture(GL_TEXTURE0_ARB + gl_state.clientunit);
 482                         CHECKGLERROR
 483                 }
 484         }
 485 }
 486
 487 void GL_BlendFunc(int blendfunc1, int blendfunc2)
 488 {
 489         if (gl_state.blendfunc1 != blendfunc1 || gl_state.blendfunc2 != blendfunc2)
 490         {
 491                 if (r_showtrispass)
 492                         return;
 493                 qglBlendFunc(gl_state.blendfunc1 = blendfunc1, gl_state.blendfunc2 = blendfunc2);CHECKGLERROR
 494                 if (gl_state.blendfunc2 == GL_ZERO)
 495                 {
 496                         if (gl_state.blendfunc1 == GL_ONE)
 497                         {
 498                                 if (gl_state.blend)
 499                                 {
 500                                         gl_state.blend = 0;
 501                                         qglDisable(GL_BLEND);CHECKGLERROR
 502                                 }
 503                         }
 504                         else
 505                         {
 506                                 if (!gl_state.blend)
 507                                 {
 508                                         gl_state.blend = 1;
 509                                         qglEnable(GL_BLEND);CHECKGLERROR
 510                                 }
 511                         }
 512                 }
 513                 else
 514                 {
 515                         if (!gl_state.blend)
 516                         {
 517                                 gl_state.blend = 1;
 518                                 qglEnable(GL_BLEND);CHECKGLERROR
 519                         }
 520                 }
 521         }
 522 }
 523
 524 void GL_DepthMask(int state)
 525 {
 526         if (gl_state.depthmask != state)
 527         {
 528                 if (r_showtrispass)
 529                         return;
 530                 qglDepthMask(gl_state.depthmask = state);CHECKGLERROR
 531         }
 532 }
 533
 534 void GL_DepthTest(int state)
 535 {
 536         if (gl_state.depthtest != state)
 537         {
 538                 if (r_showtrispass)
 539                         return;
 540                 gl_state.depthtest = state;
 541                 if (gl_state.depthtest)
 542                 {
 543                         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 544                 }
 545                 else
 546                 {
 547                         qglDisable(GL_DEPTH_TEST);CHECKGLERROR
 548                 }
 549         }
 550 }
 551
 552 void GL_ColorMask(int r, int g, int b, int a)
 553 {
 554         int state = r*8 + g*4 + b*2 + a*1;
 555         if (gl_state.colormask != state)
 556         {
 557                 if (r_showtrispass)
 558                         return;
 559                 gl_state.colormask = state;
 560                 qglColorMask((GLboolean)r, (GLboolean)g, (GLboolean)b, (GLboolean)a);CHECKGLERROR
 561         }
 562 }
 563
 564 void GL_VertexPointer(const float *p)
 565 {
 566         if (gl_state.pointer_vertex != p)
 567         {
 568                 gl_state.pointer_vertex = p;
 569                 CHECKGLERROR
 570                 qglVertexPointer(3, GL_FLOAT, sizeof(float[3]), gl_state.pointer_vertex);
 571                 CHECKGLERROR
 572         }
 573 }
 574
 575 void GL_ColorPointer(const float *p)
 576 {
 577         if (gl_state.pointer_color != p)
 578         {
 579                 if (r_showtrispass)
 580                         return;
 581                 CHECKGLERROR
 582                 if (!gl_state.pointer_color)
 583                 {
 584                         qglEnableClientState(GL_COLOR_ARRAY);
 585                         CHECKGLERROR
 586                 }
 587                 else if (!p)
 588                 {
 589                         qglDisableClientState(GL_COLOR_ARRAY);
 590                         CHECKGLERROR
 591                         // when color array is on the glColor gets trashed, set it again
 592                         qglColor4f(gl_state.color4f[0], gl_state.color4f[1], gl_state.color4f[2], gl_state.color4f[3]);
 593                         CHECKGLERROR
 594                 }
 595                 gl_state.pointer_color = p;
 596                 qglColorPointer(4, GL_FLOAT, sizeof(float[4]), gl_state.pointer_color);
 597                 CHECKGLERROR
 598         }
 599 }
 600
 601 void GL_Color(float cr, float cg, float cb, float ca)
 602 {
 603         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)
 604         {
 605                 if (r_showtrispass)
 606                         return;
 607                 gl_state.color4f[0] = cr;
 608                 gl_state.color4f[1] = cg;
 609                 gl_state.color4f[2] = cb;
 610                 gl_state.color4f[3] = ca;
 611                 CHECKGLERROR
 612                 qglColor4f(gl_state.color4f[0], gl_state.color4f[1], gl_state.color4f[2], gl_state.color4f[3]);
 613                 CHECKGLERROR
 614         }
 615 }
 616
 617 void GL_ShowTrisColor(float cr, float cg, float cb, float ca)
 618 {
 619         if (!r_showtrispass)
 620                 return;
 621         r_showtrispass = false;
 622         GL_Color(cr * r_showtris.value, cg * r_showtris.value, cb * r_showtris.value, ca);
 623         r_showtrispass = true;
 624 }
 625
 626
 627 void GL_LockArrays(int first, int count)
 628 {
 629         if (gl_state.lockrange_count != count || gl_state.lockrange_first != first)
 630         {
 631                 if (gl_state.lockrange_count)
 632                 {
 633                         gl_state.lockrange_count = 0;
 634                         CHECKGLERROR
 635                         qglUnlockArraysEXT();
 636                         CHECKGLERROR
 637                 }
 638                 if (count && gl_supportslockarrays && gl_lockarrays.integer)
 639                 {
 640                         gl_state.lockrange_first = first;
 641                         gl_state.lockrange_count = count;
 642                         CHECKGLERROR
 643                         qglLockArraysEXT(first, count);
 644                         CHECKGLERROR
 645                 }
 646         }
 647 }
 648
 649 void GL_Scissor (int x, int y, int width, int height)
 650 {
 651         CHECKGLERROR
 652         qglScissor(x, vid.realheight - (y + height),width,height);
 653         CHECKGLERROR
 654 }
 655
 656 void GL_ScissorTest(int state)
 657 {
 658         if(gl_state.scissortest == state)
 659                 return;
 660
 661         CHECKGLERROR
 662         if((gl_state.scissortest = state))
 663                 qglEnable(GL_SCISSOR_TEST);
 664         else
 665                 qglDisable(GL_SCISSOR_TEST);
 666         CHECKGLERROR
 667 }
 668
 669 void GL_Clear(int mask)
 670 {
 671         if (r_showtrispass)
 672                 return;
 673         qglClear(mask);CHECKGLERROR
 674 }
 675
 676 void GL_TransformToScreen(const vec4_t in, vec4_t out)
 677 {
 678         vec4_t temp;
 679         float iw;
 680         Matrix4x4_Transform4 (&backend_viewmatrix, in, temp);
 681         Matrix4x4_Transform4 (&backend_projectmatrix, temp, out);
 682         iw = 1.0f / out[3];
 683         out[0] = r_view_x + (out[0] * iw + 1.0f) * r_view_width * 0.5f;
 684         out[1] = r_view_y + (out[1] * iw + 1.0f) * r_view_height * 0.5f;
 685         out[2] = out[2] * iw;
 686 }
 687
 688 // called at beginning of frame
 689 void R_Mesh_Start(void)
 690 {
 691         BACKENDACTIVECHECK
 692         CHECKGLERROR
 693         GL_Backend_ResetState();
 694 }
 695
 696 int gl_backend_rebindtextures;
 697
 698 void GL_Backend_RenumberElements(int *out, int count, const int *in, int offset)
 699 {
 700         int i;
 701         if (offset)
 702         {
 703                 for (i = 0;i < count;i++)
 704                         *out++ = *in++ + offset;
 705         }
 706         else
 707                 memcpy(out, in, sizeof(*out) * count);
 708 }
 709
 710 // renders triangles using vertices from the active arrays
 711 int paranoidblah = 0;
 712 void R_Mesh_Draw(int numverts, int numtriangles, const int *elements)
 713 {
 714         int numelements = numtriangles * 3;
 715         if (numverts == 0 || numtriangles == 0)
 716         {
 717                 Con_Printf("R_Mesh_Draw(%d, %d, %08p);\n", numverts, numtriangles, elements);
 718                 return;
 719         }
 720         if (r_showtrispass)
 721         {
 722                 R_Mesh_Draw_ShowTris(numverts, numtriangles, elements);
 723                 return;
 724         }
 725         c_meshs++;
 726         c_meshelements += numelements;
 727         CHECKGLERROR
 728         if (r_render.integer)
 729         {
 730                 if (gl_paranoid.integer)
 731                 {
 732                         int i, j, size;
 733                         const int *p;
 734                         if (!qglIsEnabled(GL_VERTEX_ARRAY))
 735                                 Con_Print("R_Mesh_Draw: vertex array not enabled\n");
 736                         for (j = 0, size = numverts * (int)sizeof(float[3]), p = gl_state.pointer_vertex;j < size;j += sizeof(int), p++)
 737                                 paranoidblah += *p;
 738                         if (gl_state.pointer_color)
 739                         {
 740                                 if (!qglIsEnabled(GL_COLOR_ARRAY))
 741                                         Con_Print("R_Mesh_Draw: color array set but not enabled\n");
 742                                 for (j = 0, size = numverts * (int)sizeof(float[4]), p = gl_state.pointer_color;j < size;j += sizeof(int), p++)
 743                                         paranoidblah += *p;
 744                         }
 745                         for (i = 0;i < backendunits;i++)
 746                         {
 747                                 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)
 748                                 {
 749                                         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))
 750                                                 Con_Print("R_Mesh_Draw: array enabled but no texture bound\n");
 751                                         GL_ActiveTexture(i);
 752                                         if (!qglIsEnabled(GL_TEXTURE_COORD_ARRAY))
 753                                                 Con_Print("R_Mesh_Draw: texcoord array set but not enabled\n");
 754                                         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++)
 755                                                 paranoidblah += *p;
 756                                 }
 757                         }
 758                         for (i = 0;i < numtriangles * 3;i++)
 759                         {
 760                                 if (elements[i] < 0 || elements[i] >= numverts)
 761                                 {
 762                                         Con_Printf("R_Mesh_Draw: invalid vertex index %i (outside range 0 - %i) in elements list\n", elements[i], numverts);
 763                                         return;
 764                                 }
 765                         }
 766                 }
 767                 CHECKGLERROR
 768                 GL_LockArrays(0, numverts);
 769                 CHECKGLERROR
 770                 if (gl_mesh_testmanualfeeding.integer)
 771                 {
 772                         int i, j;
 773                         const GLfloat *p;
 774                         qglBegin(GL_TRIANGLES);
 775                         for (i = 0;i < numtriangles * 3;i++)
 776                         {
 777                                 for (j = 0;j < backendunits;j++)
 778                                 {
 779                                         if (gl_state.units[j].pointer_texcoord)
 780                                         {
 781                                                 if (backendunits > 1)
 782                                                 {
 783                                                         if (gl_state.units[j].t3d || gl_state.units[j].tcubemap)
 784                                                         {
 785                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 3;
 786                                                                 qglMultiTexCoord3f(GL_TEXTURE0_ARB + j, p[0], p[1], p[2]);
 787                                                         }
 788                                                         else
 789                                                         {
 790                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 2;
 791                                                                 qglMultiTexCoord2f(GL_TEXTURE0_ARB + j, p[0], p[1]);
 792                                                         }
 793                                                 }
 794                                                 else
 795                                                 {
 796                                                         if (gl_state.units[j].t3d || gl_state.units[j].tcubemap)
 797                                                         {
 798                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 3;
 799                                                                 qglTexCoord3f(p[0], p[1], p[2]);
 800                                                         }
 801                                                         else
 802                                                         {
 803                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 2;
 804                                                                 qglTexCoord2f(p[0], p[1]);
 805                                                         }
 806                                                 }
 807                                         }
 808                                 }
 809                                 if (gl_state.pointer_color)
 810                                 {
 811                                         p = ((const GLfloat *)(gl_state.pointer_color)) + elements[i] * 4;
 812                                         qglColor4f(p[0], p[1], p[2], p[3]);
 813                                 }
 814                                 p = ((const GLfloat *)(gl_state.pointer_vertex)) + elements[i] * 3;
 815                                 qglVertex3f(p[0], p[1], p[2]);
 816                         }
 817                         qglEnd();
 818                         CHECKGLERROR
 819                 }
 820                 else if (gl_mesh_testarrayelement.integer)
 821                 {
 822                         int i;
 823                         qglBegin(GL_TRIANGLES);
 824                         for (i = 0;i < numtriangles * 3;i++)
 825                         {
 826                                 qglArrayElement(elements[i]);
 827                         }
 828                         qglEnd();
 829                         CHECKGLERROR
 830                 }
 831                 else if (gl_mesh_drawrangeelements.integer && qglDrawRangeElements != NULL)
 832                 {
 833                         qglDrawRangeElements(GL_TRIANGLES, 0, numverts, numelements, GL_UNSIGNED_INT, elements);CHECKGLERROR
 834                 }
 835                 else
 836                 {
 837                         qglDrawElements(GL_TRIANGLES, numelements, GL_UNSIGNED_INT, elements);CHECKGLERROR
 838                 }
 839                 CHECKGLERROR
 840                 GL_LockArrays(0, 0);
 841                 CHECKGLERROR
 842         }
 843 }
 844
 845 // restores backend state, used when done with 3D rendering
 846 void R_Mesh_Finish(void)
 847 {
 848         int i;
 849         BACKENDACTIVECHECK
 850         CHECKGLERROR
 851         GL_LockArrays(0, 0);
 852         CHECKGLERROR
 853
 854         for (i = backendunits - 1;i >= 0;i--)
 855         {
 856                 if (qglActiveTexture)
 857                         qglActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
 858                 if (qglClientActiveTexture)
 859                         qglClientActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
 860                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 861                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 862                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 863                 if (gl_texture3d)
 864                 {
 865                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 866                 }
 867                 if (gl_texturecubemap)
 868                 {
 869                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 870                 }
 871                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 872                 if (gl_combine.integer)
 873                 {
 874                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
 875                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
 876                 }
 877         }
 878         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 879         qglDisableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 880
 881         qglDisable(GL_BLEND);CHECKGLERROR
 882         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 883         qglDepthMask(GL_TRUE);CHECKGLERROR
 884         qglBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);CHECKGLERROR
 885 }
 886
 887 void R_Mesh_Matrix(const matrix4x4_t *matrix)
 888 {
 889         if (memcmp(matrix, &backend_modelmatrix, sizeof(matrix4x4_t)))
 890         {
 891                 backend_modelmatrix = *matrix;
 892                 Matrix4x4_Concat(&backend_modelviewmatrix, &backend_viewmatrix, matrix);
 893                 Matrix4x4_Transpose(&backend_glmodelviewmatrix, &backend_modelviewmatrix);
 894                 qglLoadMatrixf(&backend_glmodelviewmatrix.m[0][0]);
 895         }
 896 }
 897
 898 void R_Mesh_TextureMatrix(int unitnumber, const matrix4x4_t *matrix)
 899 {
 900         if (memcmp(&gl_state.units[unitnumber].matrix, matrix, sizeof(matrix4x4_t)))
 901         {
 902                 matrix4x4_t tempmatrix;
 903                 gl_state.units[unitnumber].matrix = *matrix;
 904                 Matrix4x4_Transpose(&tempmatrix, &gl_state.units[unitnumber].matrix);
 905                 qglMatrixMode(GL_TEXTURE);
 906                 GL_ActiveTexture(unitnumber);
 907                 qglLoadMatrixf(&tempmatrix.m[0][0]);
 908                 qglMatrixMode(GL_MODELVIEW);
 909         }
 910 }
 911
 912 void R_Mesh_State_Texture(const rmeshstate_t *m)
 913 {
 914         int i, combinergb, combinealpha, scale, arrayis3d;
 915         gltextureunit_t *unit;
 916
 917         BACKENDACTIVECHECK
 918
 919         if (gl_backend_rebindtextures)
 920         {
 921                 gl_backend_rebindtextures = false;
 922                 GL_SetupTextureState();
 923         }
 924
 925         if (r_showtrispass)
 926                 return;
 927         for (i = 0, unit = gl_state.units;i < backendunits;i++, unit++)
 928         {
 929                 if (unit->t1d != m->tex1d[i])
 930                 {
 931                         GL_ActiveTexture(i);
 932                         if (m->tex1d[i])
 933                         {
 934                                 if (unit->t1d == 0)
 935                                         qglEnable(GL_TEXTURE_1D);CHECKGLERROR
 936                         }
 937                         else
 938                         {
 939                                 if (unit->t1d)
 940                                         qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 941                         }
 942                         qglBindTexture(GL_TEXTURE_1D, (unit->t1d = m->tex1d[i]));CHECKGLERROR
 943                 }
 944                 if (unit->t2d != m->tex[i])
 945                 {
 946                         GL_ActiveTexture(i);
 947                         if (m->tex[i])
 948                         {
 949                                 if (unit->t2d == 0)
 950                                         qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 951                         }
 952                         else
 953                         {
 954                                 if (unit->t2d)
 955                                         qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 956                         }
 957                         qglBindTexture(GL_TEXTURE_2D, (unit->t2d = m->tex[i]));CHECKGLERROR
 958                 }
 959                 if (unit->t3d != m->tex3d[i])
 960                 {
 961                         GL_ActiveTexture(i);
 962                         if (m->tex3d[i])
 963                         {
 964                                 if (unit->t3d == 0)
 965                                         qglEnable(GL_TEXTURE_3D);CHECKGLERROR
 966                         }
 967                         else
 968                         {
 969                                 if (unit->t3d)
 970                                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 971                         }
 972                         qglBindTexture(GL_TEXTURE_3D, (unit->t3d = m->tex3d[i]));CHECKGLERROR
 973                 }
 974                 if (unit->tcubemap != m->texcubemap[i])
 975                 {
 976                         GL_ActiveTexture(i);
 977                         if (m->texcubemap[i])
 978                         {
 979                                 if (unit->tcubemap == 0)
 980                                         qglEnable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 981                         }
 982                         else
 983                         {
 984                                 if (unit->tcubemap)
 985                                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 986                         }
 987                         qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, (unit->tcubemap = m->texcubemap[i]));CHECKGLERROR
 988                 }
 989                 combinergb = m->texcombinergb[i];
 990                 if (!combinergb)
 991                         combinergb = GL_MODULATE;
 992                 if (unit->combinergb != combinergb)
 993                 {
 994                         GL_ActiveTexture(i);
 995                         unit->combinergb = combinergb;
 996                         if (gl_combine.integer)
 997                         {
 998                                 qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, unit->combinergb);CHECKGLERROR
 999                         }
1000                         else
1001                         {
1002                                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, unit->combinergb);CHECKGLERROR
1003                         }
1004                 }
1005                 combinealpha = m->texcombinealpha[i];
1006                 if (!combinealpha)
1007                         combinealpha = GL_MODULATE;
1008                 if (unit->combinealpha != combinealpha)
1009                 {
1010                         GL_ActiveTexture(i);
1011                         unit->combinealpha = combinealpha;
1012                         if (gl_combine.integer)
1013                         {
1014                                 qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, unit->combinealpha);CHECKGLERROR
1015                         }
1016                 }
1017                 scale = max(m->texrgbscale[i], 1);
1018                 if (unit->rgbscale != scale)
1019                 {
1020                         GL_ActiveTexture(i);
1021                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, (unit->rgbscale = scale));CHECKGLERROR
1022                 }
1023                 scale = max(m->texalphascale[i], 1);
1024                 if (unit->alphascale != scale)
1025                 {
1026                         GL_ActiveTexture(i);
1027                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, (unit->alphascale = scale));CHECKGLERROR
1028                 }
1029                 arrayis3d = unit->t3d || unit->tcubemap;
1030                 if (unit->pointer_texcoord != m->pointer_texcoord[i] || unit->arrayis3d != arrayis3d)
1031                 {
1032                         GL_ClientActiveTexture(i);
1033                         if (m->pointer_texcoord[i])
1034                         {
1035                                 if (!unit->arrayenabled)
1036                                 {
1037                                         unit->arrayenabled = true;
1038                                         qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
1039                                 }
1040                         }
1041                         else
1042                         {
1043                                 if (unit->arrayenabled)
1044                                 {
1045                                         unit->arrayenabled = false;
1046                                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
1047                                 }
1048                         }
1049                         unit->pointer_texcoord = m->pointer_texcoord[i];
1050                         unit->arrayis3d = arrayis3d;
1051                         if (unit->arrayis3d)
1052                                 qglTexCoordPointer(3, GL_FLOAT, sizeof(float[3]), unit->pointer_texcoord);
1053                         else
1054                                 qglTexCoordPointer(2, GL_FLOAT, sizeof(float[2]), unit->pointer_texcoord);
1055                         CHECKGLERROR
1056                 }
1057         }
1058 }
1059
1060 void R_Mesh_Draw_ShowTris(int numverts, int numtriangles, const int *elements)
1061 {
1062         qglBegin(GL_LINES);
1063         for (;numtriangles;numtriangles--, elements += 3)
1064         {
1065                 qglArrayElement(elements[0]);qglArrayElement(elements[1]);
1066                 qglArrayElement(elements[1]);qglArrayElement(elements[2]);
1067                 qglArrayElement(elements[2]);qglArrayElement(elements[0]);
1068         }
1069         qglEnd();
1070         CHECKGLERROR
1071 }
1072
1073 /*
1074 ==============================================================================
1075
1076                                                 SCREEN SHOTS
1077
1078 ==============================================================================
1079 */
1080
1081 qboolean SCR_ScreenShot(char *filename, int x, int y, int width, int height, qboolean jpeg)
1082 {
1083         qboolean ret;
1084         qbyte *buffer;
1085
1086         if (!r_render.integer)
1087                 return false;
1088
1089         buffer = Mem_Alloc(tempmempool, width*height*3);
1090         qglReadPixels (x, y, width, height, GL_RGB, GL_UNSIGNED_BYTE, buffer);
1091         CHECKGLERROR
1092
1093         if (jpeg)
1094                 ret = JPEG_SaveImage_preflipped (filename, width, height, buffer);
1095         else
1096                 ret = Image_WriteTGARGB_preflipped (filename, width, height, buffer);
1097
1098         Mem_Free(buffer);
1099         return ret;
1100 }
1101
1102 //=============================================================================
1103
1104 void R_ClearScreen(void)
1105 {
1106         if (r_render.integer)
1107         {
1108                 // clear to black
1109                 qglClearColor(0,0,0,0);CHECKGLERROR
1110                 qglClearDepth(1);CHECKGLERROR
1111                 if (gl_stencil)
1112                 {
1113                         // LordHavoc: we use a stencil centered around 128 instead of 0,
1114                         // to avoid clamping interfering with strange shadow volume
1115                         // drawing orders
1116                         qglClearStencil(128);CHECKGLERROR
1117                 }
1118                 // clear the screen
1119                 GL_Clear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | (gl_stencil ? GL_STENCIL_BUFFER_BIT : 0));
1120                 // set dithering mode
1121                 if (gl_dither.integer)
1122                 {
1123                         qglEnable(GL_DITHER);CHECKGLERROR
1124                 }
1125                 else
1126                 {
1127                         qglDisable(GL_DITHER);CHECKGLERROR
1128                 }
1129         }
1130 }
1131
1132 /*
1133 ====================
1134 CalcFov
1135 ====================
1136 */
1137 float CalcFov (float fov_x, float width, float height)
1138 {
1139         // calculate vision size and alter by aspect, then convert back to angle
1140         return atan (height / (width / tan(fov_x/360*M_PI))) * 360 / M_PI;
1141 }
1142
1143 /*
1144 ==================
1145 SCR_UpdateScreen
1146
1147 This is called every frame, and can also be called explicitly to flush
1148 text to the screen.
1149 ==================
1150 */
1151 void SCR_UpdateScreen (void)
1152 {
1153         if (gl_delayfinish.integer)
1154         {
1155                 R_Mesh_Finish();
1156                 R_TimeReport("meshfinish");
1157                 VID_Finish();
1158                 R_TimeReport("finish");
1159         }
1160
1161         R_Mesh_Start();
1162
1163         if (r_textureunits.integer > gl_textureunits)
1164                 Cvar_SetValueQuick(&r_textureunits, gl_textureunits);
1165         if (r_textureunits.integer < 1)
1166                 Cvar_SetValueQuick(&r_textureunits, 1);
1167
1168         if (gl_combine.integer && (!gl_combine_extension || r_textureunits.integer < 2))
1169                 Cvar_SetValueQuick(&gl_combine, 0);
1170
1171 showtris:
1172         R_TimeReport("setup");
1173
1174         R_ClearScreen();
1175
1176         R_TimeReport("clear");
1177
1178         if (scr_conlines < vid.conheight && cls.signon == SIGNONS)
1179         {
1180                 float size;
1181                 int contents;
1182
1183                 // bound viewsize
1184                 if (scr_viewsize.value < 30)
1185                         Cvar_Set ("viewsize","30");
1186                 if (scr_viewsize.value > 120)
1187                         Cvar_Set ("viewsize","120");
1188
1189                 // bound field of view
1190                 if (scr_fov.value < 1)
1191                         Cvar_Set ("fov","1");
1192                 if (scr_fov.value > 170)
1193                         Cvar_Set ("fov","170");
1194
1195                 // intermission is always full screen
1196                 if (cl.intermission)
1197                 {
1198                         size = 1;
1199                         sb_lines = 0;
1200                 }
1201                 else
1202                 {
1203                         if (scr_viewsize.value >= 120)
1204                                 sb_lines = 0;           // no status bar at all
1205                         else if (scr_viewsize.value >= 110)
1206                                 sb_lines = 24;          // no inventory
1207                         else
1208                                 sb_lines = 24+16+8;
1209                         size = scr_viewsize.value * (1.0 / 100.0);
1210                         size = min(size, 1);
1211                 }
1212
1213                 r_refdef.width = vid.realwidth * size;
1214                 r_refdef.height = vid.realheight * size;
1215                 r_refdef.x = (vid.realwidth - r_refdef.width)/2;
1216                 r_refdef.y = (vid.realheight - r_refdef.height)/2;
1217
1218                 // LordHavoc: viewzoom (zoom in for sniper rifles, etc)
1219                 r_refdef.fov_x = scr_fov.value * cl.viewzoom;
1220                 r_refdef.fov_y = CalcFov (r_refdef.fov_x, r_refdef.width, r_refdef.height);
1221
1222                 if (cl.worldmodel)
1223                 {
1224                         Mod_CheckLoaded(cl.worldmodel);
1225                         contents = CL_PointSuperContents(r_vieworigin);
1226                         if (contents & SUPERCONTENTS_LIQUIDSMASK)
1227                         {
1228                                 r_refdef.fov_x *= (sin(cl.time * 4.7) * 0.015 + 0.985);
1229                                 r_refdef.fov_y *= (sin(cl.time * 3.0) * 0.015 + 0.985);
1230                         }
1231                 }
1232
1233                 R_RenderView();
1234
1235                 if (scr_zoomwindow.integer)
1236                 {
1237                         float sizex = bound(10, scr_zoomwindow_viewsizex.value, 100) / 100.0;
1238                         float sizey = bound(10, scr_zoomwindow_viewsizey.value, 100) / 100.0;
1239                         r_refdef.width = vid.realwidth * sizex;
1240                         r_refdef.height = vid.realheight * sizey;
1241                         r_refdef.x = (vid.realwidth - r_refdef.width)/2;
1242                         r_refdef.y = 0;
1243                         r_refdef.fov_x = scr_zoomwindow_fov.value;
1244                         r_refdef.fov_y = CalcFov(r_refdef.fov_x, r_refdef.width, r_refdef.height);
1245
1246                         R_RenderView();
1247                 }
1248         }
1249
1250         // draw 2D stuff
1251         R_DrawQueue();
1252
1253         if (r_showtrispass)
1254                 r_showtrispass = false;
1255         else if (r_showtris.value > 0)
1256         {
1257                 rmeshstate_t m;
1258                 GL_BlendFunc(GL_ONE, GL_ONE);
1259                 GL_DepthTest(GL_FALSE);
1260                 GL_DepthMask(GL_FALSE);
1261                 memset(&m, 0, sizeof(m));
1262                 R_Mesh_State_Texture(&m);
1263                 r_showtrispass = true;
1264                 GL_ShowTrisColor(0.2,0.2,0.2,1);
1265                 goto showtris;
1266         }
1267
1268         if (gl_delayfinish.integer)
1269         {
1270                 // tell driver to commit it's partially full geometry queue to the rendering queue
1271                 // (this doesn't wait for the commands themselves to complete)
1272                 qglFlush();
1273         }
1274         else
1275         {
1276                 R_Mesh_Finish();
1277                 R_TimeReport("meshfinish");
1278                 VID_Finish();
1279                 R_TimeReport("finish");
1280         }
1281 }
1282
1283
1284 //===========================================================================
1285 // dynamic vertex array buffer subsystem
1286 //===========================================================================
1287
1288 float varray_vertex3f[65536*3];
1289 float varray_color4f[65536*4];
1290 float varray_texcoord2f[4][65536*2];
1291 float varray_texcoord3f[4][65536*3];
1292 float varray_normal3f[65536*3];
1293 int earray_element3i[65536];
1294
1295 //===========================================================================
1296 // vertex array caching subsystem
1297 //===========================================================================
1298
1299 typedef struct rcachearraylink_s
1300 {
1301         struct rcachearraylink_s *next, *prev;
1302         struct rcachearrayitem_s *data;
1303 }
1304 rcachearraylink_t;
1305
1306 typedef struct rcachearrayitem_s
1307 {
1308         // the original request structure
1309         rcachearrayrequest_t request;
1310         // active
1311         int active;
1312         // offset into r_mesh_rcachedata
1313         int offset;
1314         // for linking this into the sequential list
1315         rcachearraylink_t sequentiallink;
1316         // for linking this into the lookup list
1317         rcachearraylink_t hashlink;
1318 }
1319 rcachearrayitem_t;
1320
1321 #define RCACHEARRAY_HASHSIZE 65536
1322 #define RCACHEARRAY_ITEMS 4096
1323 #define RCACHEARRAY_DEFAULTSIZE (4 << 20)
1324
1325 // all active items are linked into this chain in sorted order
1326 static rcachearraylink_t r_mesh_rcachesequentialchain;
1327 // all inactive items are linked into this chain in unknown order
1328 static rcachearraylink_t r_mesh_rcachefreechain;
1329 // all active items are also linked into these chains (using their hashlink)
1330 static rcachearraylink_t r_mesh_rcachechain[RCACHEARRAY_HASHSIZE];
1331
1332 // all items are stored here, whether active or inactive
1333 static rcachearrayitem_t r_mesh_rcacheitems[RCACHEARRAY_ITEMS];
1334
1335 // size of data buffer
1336 static int r_mesh_rcachedata_size = RCACHEARRAY_DEFAULTSIZE;
1337 // data buffer
1338 static qbyte r_mesh_rcachedata[RCACHEARRAY_DEFAULTSIZE];
1339
1340 // current state
1341 static int r_mesh_rcachedata_offset;
1342 static rcachearraylink_t *r_mesh_rcachesequentialchain_current;
1343
1344 static void R_Mesh_CacheArray_Startup(void)
1345 {
1346         int i;
1347         rcachearraylink_t *l;
1348         // prepare all the linked lists
1349         l = &r_mesh_rcachesequentialchain;l->next = l->prev = l;l->data = NULL;
1350         l = &r_mesh_rcachefreechain;l->next = l->prev = l;l->data = NULL;
1351         memset(&r_mesh_rcachechain, 0, sizeof(r_mesh_rcachechain));
1352         for (i = 0;i < RCACHEARRAY_HASHSIZE;i++)
1353         {
1354                 l = &r_mesh_rcachechain[i];
1355                 l->next = l->prev = l;
1356                 l->data = NULL;
1357         }
1358         memset(&r_mesh_rcacheitems, 0, sizeof(r_mesh_rcacheitems));
1359         for (i = 0;i < RCACHEARRAY_ITEMS;i++)
1360         {
1361                 r_mesh_rcacheitems[i].hashlink.data = r_mesh_rcacheitems[i].sequentiallink.data = &r_mesh_rcacheitems[i];
1362                 l = &r_mesh_rcacheitems[i].sequentiallink;
1363                 l->next = &r_mesh_rcachefreechain;
1364                 l->prev = l->next->prev;
1365                 l->next->prev = l->prev->next = l;
1366         }
1367         // clear other state
1368         r_mesh_rcachedata_offset = 0;
1369         r_mesh_rcachesequentialchain_current = &r_mesh_rcachesequentialchain;
1370 }
1371
1372 static void R_Mesh_CacheArray_Shutdown(void)
1373 {
1374 }
1375
1376 /*
1377 static void R_Mesh_CacheArray_ValidateState(int num)
1378 {
1379         rcachearraylink_t *l, *lhead;
1380         lhead = &r_mesh_rcachesequentialchain;
1381         if (r_mesh_rcachesequentialchain_current == lhead)
1382                 return;
1383         for (l = lhead->next;l != lhead;l = l->next)
1384                 if (r_mesh_rcachesequentialchain_current == l)
1385                         return;
1386         Sys_Error("%i", num);
1387 }
1388 */
1389
1390 int R_Mesh_CacheArray(rcachearrayrequest_t *r)
1391 {
1392         rcachearraylink_t *l, *lhead, *lnext;
1393         rcachearrayitem_t *d;
1394         int hashindex, offset, offsetend;
1395
1396         //R_Mesh_CacheArray_ValidateState(3);
1397         // calculate a hashindex to choose a cache chain
1398         r->data = NULL;
1399         hashindex = CRC_Block((void *)r, sizeof(*r)) % RCACHEARRAY_HASHSIZE;
1400
1401         // is it already cached?
1402         for (lhead = &r_mesh_rcachechain[hashindex], l = lhead->next;l != lhead;l = l->next)
1403         {
1404                 if (!memcmp(&l->data->request, r, sizeof(l->data->request)))
1405                 {
1406                         // we have it cached already
1407                         r->data = r_mesh_rcachedata + l->data->offset;
1408                         return false;
1409                 }
1410         }
1411
1412         // we need to add a new cache item, this means finding a place for the new
1413         // data and making sure we have a free item available, lots of work...
1414
1415         // check if buffer needs to wrap
1416         if (r_mesh_rcachedata_offset + r->data_size > r_mesh_rcachedata_size)
1417         {
1418                 /*
1419                 if (r->data_size * 10 > r_mesh_rcachedata_size)
1420                 {
1421                         // realloc whole cache
1422                 }
1423                 */
1424                 // reset back to start
1425                 r_mesh_rcachedata_offset = 0;
1426                 r_mesh_rcachesequentialchain_current = &r_mesh_rcachesequentialchain;
1427         }
1428         offset = r_mesh_rcachedata_offset;
1429         r_mesh_rcachedata_offset += r->data_size;
1430         offsetend = r_mesh_rcachedata_offset;
1431         //R_Mesh_CacheArray_ValidateState(4);
1432
1433         /*
1434         {
1435                 int n;
1436                 for (lhead = &r_mesh_rcachesequentialchain, l = lhead->next, n = 0;l != lhead;l = l->next, n++);
1437                 Con_Printf("R_Mesh_CacheArray: new data range %i:%i, %i items are already linked\n", offset, offsetend, n);
1438         }
1439         */
1440
1441         // make room for the new data (remove old items)
1442         lhead = &r_mesh_rcachesequentialchain;
1443         l = r_mesh_rcachesequentialchain_current;
1444         if (l == lhead)
1445                 l = l->next;
1446         while (l != lhead && l->data->offset < offsetend && l->data->offset + l->data->request.data_size > offset)
1447         {
1448         //r_mesh_rcachesequentialchain_current = l;
1449         //R_Mesh_CacheArray_ValidateState(8);
1450                 lnext = l->next;
1451                 // if at the end of the chain, wrap around
1452                 if (lnext == lhead)
1453                         lnext = lnext->next;
1454         //r_mesh_rcachesequentialchain_current = lnext;
1455         //R_Mesh_CacheArray_ValidateState(10);
1456
1457                 // unlink from sequential chain
1458                 l->next->prev = l->prev;
1459                 l->prev->next = l->next;
1460         //R_Mesh_CacheArray_ValidateState(11);
1461                 // link into free chain
1462                 l->next = &r_mesh_rcachefreechain;
1463                 l->prev = l->next->prev;
1464                 l->next->prev = l->prev->next = l;
1465         //R_Mesh_CacheArray_ValidateState(12);
1466
1467                 l = &l->data->hashlink;
1468                 // unlink from hash chain
1469                 l->next->prev = l->prev;
1470                 l->prev->next = l->next;
1471
1472                 l = lnext;
1473         //r_mesh_rcachesequentialchain_current = l;
1474         //R_Mesh_CacheArray_ValidateState(9);
1475         }
1476         //r_mesh_rcachesequentialchain_current = l;
1477         //R_Mesh_CacheArray_ValidateState(5);
1478         // gobble an extra item if we have no free items available
1479         if (r_mesh_rcachefreechain.next == &r_mesh_rcachefreechain)
1480         {
1481                 lnext = l->next;
1482
1483                 // unlink from sequential chain
1484                 l->next->prev = l->prev;
1485                 l->prev->next = l->next;
1486                 // link into free chain
1487                 l->next = &r_mesh_rcachefreechain;
1488                 l->prev = l->next->prev;
1489                 l->next->prev = l->prev->next = l;
1490
1491                 l = &l->data->hashlink;
1492                 // unlink from hash chain
1493                 l->next->prev = l->prev;
1494                 l->prev->next = l->next;
1495
1496                 l = lnext;
1497         }
1498         r_mesh_rcachesequentialchain_current = l;
1499         //R_Mesh_CacheArray_ValidateState(6);
1500
1501         // now take an item from the free chain
1502         l = r_mesh_rcachefreechain.next;
1503         // set it up
1504         d = l->data;
1505         d->request = *r;
1506         d->offset = offset;
1507         // unlink
1508         l->next->prev = l->prev;
1509         l->prev->next = l->next;
1510         // relink to sequential
1511         l->next = r_mesh_rcachesequentialchain_current->prev;
1512         l->prev = l->next->prev;
1513         while (l->next->data && l->data && l->next->data->offset <= d->offset)
1514         {
1515                 //Con_Print(">\n");
1516                 l->next = l->next->next;
1517                 l->prev = l->prev->next;
1518         }
1519         while (l->prev->data && l->data && l->prev->data->offset >= d->offset)
1520         {
1521                 //Con_Print("<\n");
1522                 l->prev = l->prev->prev;
1523                 l->next = l->next->prev;
1524         }
1525         l->next->prev = l->prev->next = l;
1526         // also link into hash chain
1527         l = &l->data->hashlink;
1528         l->next = &r_mesh_rcachechain[hashindex];
1529         l->prev = l->next->prev;
1530         l->prev->next = l;
1531         l->next->prev = l->prev->next = l;
1532
1533
1534         //r_mesh_rcachesequentialchain_current = d->sequentiallink.next;
1535
1536         //R_Mesh_CacheArray_ValidateState(7);
1537         // and finally set the data pointer
1538         r->data = r_mesh_rcachedata + d->offset;
1539         // and tell the caller to fill the array
1540         return true;
1541 }
1542