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         CHECKGLERROR
 367         gl_state.unit = -1;
 368         gl_state.clientunit = -1;
 369         for (i = 0;i < backendunits;i++)
 370         {
 371                 GL_ActiveTexture(i);
 372                 GL_ClientActiveTexture(i);
 373                 unit = gl_state.units + i;
 374                 unit->t1d = 0;
 375                 unit->t2d = 0;
 376                 unit->t3d = 0;
 377                 unit->tcubemap = 0;
 378                 unit->arrayenabled = false;
 379                 unit->arrayis3d = false;
 380                 unit->pointer_texcoord = NULL;
 381                 unit->rgbscale = 1;
 382                 unit->alphascale = 1;
 383                 unit->combinergb = GL_MODULATE;
 384                 unit->combinealpha = GL_MODULATE;
 385                 unit->matrix = r_identitymatrix;
 386
 387                 qglTexCoordPointer(2, GL_FLOAT, sizeof(float[2]), NULL);CHECKGLERROR
 388                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 389
 390                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 391                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 392                 if (gl_texture3d)
 393                 {
 394                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 395                 }
 396                 if (gl_texturecubemap)
 397                 {
 398                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 399                 }
 400                 if (gl_combine.integer)
 401                 {
 402                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);CHECKGLERROR
 403                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_MODULATE);CHECKGLERROR
 404                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE);CHECKGLERROR
 405                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 406                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_RGB_ARB, GL_TEXTURE);CHECKGLERROR // for GL_INTERPOLATE_ARB mode
 407                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 408                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 409                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_RGB_ARB, GL_SRC_ALPHA);CHECKGLERROR
 410                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, GL_MODULATE);CHECKGLERROR
 411                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA_ARB, GL_TEXTURE);CHECKGLERROR
 412                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_ALPHA_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 413                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_ALPHA_ARB, GL_CONSTANT_ARB);CHECKGLERROR
 414                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 415                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 416                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 417                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
 418                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
 419                 }
 420                 else
 421                 {
 422                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 423                 }
 424         }
 425         CHECKGLERROR
 426 }
 427
 428 void GL_Backend_ResetState(void)
 429 {
 430         memset(&gl_state, 0, sizeof(gl_state));
 431         gl_state.depthtest = true;
 432         gl_state.blendfunc1 = GL_ONE;
 433         gl_state.blendfunc2 = GL_ZERO;
 434         gl_state.blend = false;
 435         gl_state.depthmask = GL_TRUE;
 436         gl_state.colormask = 15;
 437         gl_state.color4f[0] = gl_state.color4f[1] = gl_state.color4f[2] = gl_state.color4f[3] = 1;
 438         gl_state.lockrange_first = 0;
 439         gl_state.lockrange_count = 0;
 440         gl_state.pointer_vertex = NULL;
 441         gl_state.pointer_color = NULL;
 442
 443         CHECKGLERROR
 444
 445         qglColorMask(1, 1, 1, 1);
 446         qglEnable(GL_CULL_FACE);CHECKGLERROR
 447         qglCullFace(GL_FRONT);CHECKGLERROR
 448         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 449         qglBlendFunc(gl_state.blendfunc1, gl_state.blendfunc2);CHECKGLERROR
 450         qglDisable(GL_BLEND);CHECKGLERROR
 451         qglDepthMask(gl_state.depthmask);CHECKGLERROR
 452
 453         qglVertexPointer(3, GL_FLOAT, sizeof(float[3]), NULL);CHECKGLERROR
 454         qglEnableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 455
 456         qglColorPointer(4, GL_FLOAT, sizeof(float[4]), NULL);CHECKGLERROR
 457         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 458
 459         GL_Color(0, 0, 0, 0);
 460         GL_Color(1, 1, 1, 1);
 461
 462         GL_SetupTextureState();
 463 }
 464
 465 void GL_ActiveTexture(int num)
 466 {
 467         if (gl_state.unit != num)
 468         {
 469                 gl_state.unit = num;
 470                 if (qglActiveTexture)
 471                 {
 472                         qglActiveTexture(GL_TEXTURE0_ARB + gl_state.unit);
 473                         CHECKGLERROR
 474                 }
 475         }
 476 }
 477
 478 void GL_ClientActiveTexture(int num)
 479 {
 480         if (gl_state.clientunit != num)
 481         {
 482                 gl_state.clientunit = num;
 483                 if (qglActiveTexture)
 484                 {
 485                         qglClientActiveTexture(GL_TEXTURE0_ARB + gl_state.clientunit);
 486                         CHECKGLERROR
 487                 }
 488         }
 489 }
 490
 491 void GL_BlendFunc(int blendfunc1, int blendfunc2)
 492 {
 493         if (gl_state.blendfunc1 != blendfunc1 || gl_state.blendfunc2 != blendfunc2)
 494         {
 495                 if (r_showtrispass)
 496                         return;
 497                 qglBlendFunc(gl_state.blendfunc1 = blendfunc1, gl_state.blendfunc2 = blendfunc2);CHECKGLERROR
 498                 if (gl_state.blendfunc2 == GL_ZERO)
 499                 {
 500                         if (gl_state.blendfunc1 == GL_ONE)
 501                         {
 502                                 if (gl_state.blend)
 503                                 {
 504                                         gl_state.blend = 0;
 505                                         qglDisable(GL_BLEND);CHECKGLERROR
 506                                 }
 507                         }
 508                         else
 509                         {
 510                                 if (!gl_state.blend)
 511                                 {
 512                                         gl_state.blend = 1;
 513                                         qglEnable(GL_BLEND);CHECKGLERROR
 514                                 }
 515                         }
 516                 }
 517                 else
 518                 {
 519                         if (!gl_state.blend)
 520                         {
 521                                 gl_state.blend = 1;
 522                                 qglEnable(GL_BLEND);CHECKGLERROR
 523                         }
 524                 }
 525         }
 526 }
 527
 528 void GL_DepthMask(int state)
 529 {
 530         if (gl_state.depthmask != state)
 531         {
 532                 if (r_showtrispass)
 533                         return;
 534                 qglDepthMask(gl_state.depthmask = state);CHECKGLERROR
 535         }
 536 }
 537
 538 void GL_DepthTest(int state)
 539 {
 540         if (gl_state.depthtest != state)
 541         {
 542                 if (r_showtrispass)
 543                         return;
 544                 gl_state.depthtest = state;
 545                 if (gl_state.depthtest)
 546                 {
 547                         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 548                 }
 549                 else
 550                 {
 551                         qglDisable(GL_DEPTH_TEST);CHECKGLERROR
 552                 }
 553         }
 554 }
 555
 556 void GL_ColorMask(int r, int g, int b, int a)
 557 {
 558         int state = r*8 + g*4 + b*2 + a*1;
 559         if (gl_state.colormask != state)
 560         {
 561                 if (r_showtrispass)
 562                         return;
 563                 gl_state.colormask = state;
 564                 qglColorMask((GLboolean)r, (GLboolean)g, (GLboolean)b, (GLboolean)a);CHECKGLERROR
 565         }
 566 }
 567
 568 void GL_Color(float cr, float cg, float cb, float ca)
 569 {
 570         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)
 571         {
 572                 if (r_showtrispass)
 573                         return;
 574                 gl_state.color4f[0] = cr;
 575                 gl_state.color4f[1] = cg;
 576                 gl_state.color4f[2] = cb;
 577                 gl_state.color4f[3] = ca;
 578                 CHECKGLERROR
 579                 qglColor4f(gl_state.color4f[0], gl_state.color4f[1], gl_state.color4f[2], gl_state.color4f[3]);
 580                 CHECKGLERROR
 581         }
 582 }
 583
 584 void GL_ShowTrisColor(float cr, float cg, float cb, float ca)
 585 {
 586         if (!r_showtrispass)
 587                 return;
 588         r_showtrispass = false;
 589         GL_Color(cr * r_showtris.value, cg * r_showtris.value, cb * r_showtris.value, ca);
 590         r_showtrispass = true;
 591 }
 592
 593
 594 void GL_LockArrays(int first, int count)
 595 {
 596         if (gl_state.lockrange_count != count || gl_state.lockrange_first != first)
 597         {
 598                 if (gl_state.lockrange_count)
 599                 {
 600                         gl_state.lockrange_count = 0;
 601                         CHECKGLERROR
 602                         qglUnlockArraysEXT();
 603                         CHECKGLERROR
 604                 }
 605                 if (count && gl_supportslockarrays && gl_lockarrays.integer && r_render.integer)
 606                 {
 607                         gl_state.lockrange_first = first;
 608                         gl_state.lockrange_count = count;
 609                         CHECKGLERROR
 610                         qglLockArraysEXT(first, count);
 611                         CHECKGLERROR
 612                 }
 613         }
 614 }
 615
 616 void GL_Scissor (int x, int y, int width, int height)
 617 {
 618         CHECKGLERROR
 619         qglScissor(x, vid.realheight - (y + height),width,height);
 620         CHECKGLERROR
 621 }
 622
 623 void GL_ScissorTest(int state)
 624 {
 625         if(gl_state.scissortest == state)
 626                 return;
 627
 628         CHECKGLERROR
 629         if((gl_state.scissortest = state))
 630                 qglEnable(GL_SCISSOR_TEST);
 631         else
 632                 qglDisable(GL_SCISSOR_TEST);
 633         CHECKGLERROR
 634 }
 635
 636 void GL_Clear(int mask)
 637 {
 638         if (r_showtrispass)
 639                 return;
 640         qglClear(mask);CHECKGLERROR
 641 }
 642
 643 void GL_TransformToScreen(const vec4_t in, vec4_t out)
 644 {
 645         vec4_t temp;
 646         float iw;
 647         Matrix4x4_Transform4 (&backend_viewmatrix, in, temp);
 648         Matrix4x4_Transform4 (&backend_projectmatrix, temp, out);
 649         iw = 1.0f / out[3];
 650         out[0] = r_view_x + (out[0] * iw + 1.0f) * r_view_width * 0.5f;
 651         out[1] = r_view_y + (out[1] * iw + 1.0f) * r_view_height * 0.5f;
 652         out[2] = out[2] * iw;
 653 }
 654
 655 // called at beginning of frame
 656 void R_Mesh_Start(void)
 657 {
 658         BACKENDACTIVECHECK
 659         CHECKGLERROR
 660         GL_Backend_ResetState();
 661 }
 662
 663 int gl_backend_rebindtextures;
 664
 665 void GL_Backend_RenumberElements(int *out, int count, const int *in, int offset)
 666 {
 667         int i;
 668         if (offset)
 669         {
 670                 for (i = 0;i < count;i++)
 671                         *out++ = *in++ + offset;
 672         }
 673         else
 674                 memcpy(out, in, sizeof(*out) * count);
 675 }
 676
 677 // renders triangles using vertices from the active arrays
 678 int paranoidblah = 0;
 679 void R_Mesh_Draw(int numverts, int numtriangles, const int *elements)
 680 {
 681         int numelements = numtriangles * 3;
 682         if (numverts == 0 || numtriangles == 0)
 683         {
 684                 Con_Printf("R_Mesh_Draw(%d, %d, %08p);\n", numverts, numtriangles, elements);
 685                 return;
 686         }
 687         CHECKGLERROR
 688         if (r_showtrispass)
 689         {
 690                 R_Mesh_Draw_ShowTris(numverts, numtriangles, elements);
 691                 return;
 692         }
 693         c_meshs++;
 694         c_meshelements += numelements;
 695         if (gl_paranoid.integer)
 696         {
 697                 int i, j, size;
 698                 const int *p;
 699                 if (!qglIsEnabled(GL_VERTEX_ARRAY))
 700                         Con_Print("R_Mesh_Draw: vertex array not enabled\n");
 701                 for (j = 0, size = numverts * (int)sizeof(float[3]), p = gl_state.pointer_vertex;j < size;j += sizeof(int), p++)
 702                         paranoidblah += *p;
 703                 if (gl_state.pointer_color)
 704                 {
 705                         if (!qglIsEnabled(GL_COLOR_ARRAY))
 706                                 Con_Print("R_Mesh_Draw: color array set but not enabled\n");
 707                         for (j = 0, size = numverts * (int)sizeof(float[4]), p = gl_state.pointer_color;j < size;j += sizeof(int), p++)
 708                                 paranoidblah += *p;
 709                 }
 710                 for (i = 0;i < backendunits;i++)
 711                 {
 712                         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)
 713                         {
 714                                 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))
 715                                         Con_Print("R_Mesh_Draw: array enabled but no texture bound\n");
 716                                 GL_ClientActiveTexture(i);
 717                                 if (!qglIsEnabled(GL_TEXTURE_COORD_ARRAY))
 718                                         Con_Print("R_Mesh_Draw: texcoord array set but not enabled\n");
 719                                 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++)
 720                                         paranoidblah += *p;
 721                         }
 722                 }
 723                 for (i = 0;i < numtriangles * 3;i++)
 724                 {
 725                         if (elements[i] < 0 || elements[i] >= numverts)
 726                         {
 727                                 Con_Printf("R_Mesh_Draw: invalid vertex index %i (outside range 0 - %i) in elements list\n", elements[i], numverts);
 728                                 return;
 729                         }
 730                 }
 731                 CHECKGLERROR
 732         }
 733         if (r_render.integer)
 734         {
 735                 CHECKGLERROR
 736                 if (gl_mesh_testmanualfeeding.integer)
 737                 {
 738                         int i, j;
 739                         const GLfloat *p;
 740                         qglBegin(GL_TRIANGLES);
 741                         for (i = 0;i < numtriangles * 3;i++)
 742                         {
 743                                 for (j = 0;j < backendunits;j++)
 744                                 {
 745                                         if (gl_state.units[j].pointer_texcoord)
 746                                         {
 747                                                 if (backendunits > 1)
 748                                                 {
 749                                                         if (gl_state.units[j].t3d || gl_state.units[j].tcubemap)
 750                                                         {
 751                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 3;
 752                                                                 qglMultiTexCoord3f(GL_TEXTURE0_ARB + j, p[0], p[1], p[2]);
 753                                                         }
 754                                                         else
 755                                                         {
 756                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 2;
 757                                                                 qglMultiTexCoord2f(GL_TEXTURE0_ARB + j, p[0], p[1]);
 758                                                         }
 759                                                 }
 760                                                 else
 761                                                 {
 762                                                         if (gl_state.units[j].t3d || gl_state.units[j].tcubemap)
 763                                                         {
 764                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 3;
 765                                                                 qglTexCoord3f(p[0], p[1], p[2]);
 766                                                         }
 767                                                         else
 768                                                         {
 769                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 2;
 770                                                                 qglTexCoord2f(p[0], p[1]);
 771                                                         }
 772                                                 }
 773                                         }
 774                                 }
 775                                 if (gl_state.pointer_color)
 776                                 {
 777                                         p = ((const GLfloat *)(gl_state.pointer_color)) + elements[i] * 4;
 778                                         qglColor4f(p[0], p[1], p[2], p[3]);
 779                                 }
 780                                 p = ((const GLfloat *)(gl_state.pointer_vertex)) + elements[i] * 3;
 781                                 qglVertex3f(p[0], p[1], p[2]);
 782                         }
 783                         qglEnd();
 784                         CHECKGLERROR
 785                 }
 786                 else if (gl_mesh_testarrayelement.integer)
 787                 {
 788                         int i;
 789                         qglBegin(GL_TRIANGLES);
 790                         for (i = 0;i < numtriangles * 3;i++)
 791                         {
 792                                 qglArrayElement(elements[i]);
 793                         }
 794                         qglEnd();
 795                         CHECKGLERROR
 796                 }
 797                 else if (gl_mesh_drawrangeelements.integer && qglDrawRangeElements != NULL)
 798                 {
 799                         qglDrawRangeElements(GL_TRIANGLES, 0, numverts, numelements, GL_UNSIGNED_INT, elements);CHECKGLERROR
 800                 }
 801                 else
 802                 {
 803                         qglDrawElements(GL_TRIANGLES, numelements, GL_UNSIGNED_INT, elements);CHECKGLERROR
 804                 }
 805                 CHECKGLERROR
 806         }
 807 }
 808
 809 // restores backend state, used when done with 3D rendering
 810 void R_Mesh_Finish(void)
 811 {
 812         int i;
 813         BACKENDACTIVECHECK
 814         CHECKGLERROR
 815         GL_LockArrays(0, 0);
 816         CHECKGLERROR
 817
 818         for (i = backendunits - 1;i >= 0;i--)
 819         {
 820                 if (qglActiveTexture)
 821                         qglActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
 822                 if (qglClientActiveTexture)
 823                         qglClientActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
 824                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 825                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 826                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 827                 if (gl_texture3d)
 828                 {
 829                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 830                 }
 831                 if (gl_texturecubemap)
 832                 {
 833                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 834                 }
 835                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 836                 if (gl_combine.integer)
 837                 {
 838                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
 839                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
 840                 }
 841         }
 842         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 843         qglDisableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 844
 845         qglDisable(GL_BLEND);CHECKGLERROR
 846         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 847         qglDepthMask(GL_TRUE);CHECKGLERROR
 848         qglBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);CHECKGLERROR
 849 }
 850
 851 void R_Mesh_Matrix(const matrix4x4_t *matrix)
 852 {
 853         if (memcmp(matrix, &backend_modelmatrix, sizeof(matrix4x4_t)))
 854         {
 855                 backend_modelmatrix = *matrix;
 856                 Matrix4x4_Concat(&backend_modelviewmatrix, &backend_viewmatrix, matrix);
 857                 Matrix4x4_Transpose(&backend_glmodelviewmatrix, &backend_modelviewmatrix);
 858                 qglLoadMatrixf(&backend_glmodelviewmatrix.m[0][0]);
 859         }
 860 }
 861
 862 void R_Mesh_State(const rmeshstate_t *m)
 863 {
 864         int i, combinergb, combinealpha, scale, arrayis3d;
 865         gltextureunit_t *unit;
 866         const matrix4x4_t *texmatrix;
 867         matrix4x4_t tempmatrix;
 868         const float *texcoords;
 869
 870         BACKENDACTIVECHECK
 871
 872         if (gl_state.pointer_vertex != m->pointer_vertex)
 873         {
 874                 gl_state.pointer_vertex = m->pointer_vertex;
 875                 CHECKGLERROR
 876                 qglVertexPointer(3, GL_FLOAT, sizeof(float[3]), gl_state.pointer_vertex);
 877                 CHECKGLERROR
 878         }
 879
 880         if (r_showtrispass)
 881                 return;
 882
 883         if (gl_state.pointer_color != m->pointer_color)
 884         {
 885                 CHECKGLERROR
 886                 if (!gl_state.pointer_color)
 887                 {
 888                         qglEnableClientState(GL_COLOR_ARRAY);
 889                         CHECKGLERROR
 890                 }
 891                 else if (!m->pointer_color)
 892                 {
 893                         qglDisableClientState(GL_COLOR_ARRAY);
 894                         CHECKGLERROR
 895                         // when color array is on the glColor gets trashed, set it again
 896                         qglColor4f(gl_state.color4f[0], gl_state.color4f[1], gl_state.color4f[2], gl_state.color4f[3]);
 897                         CHECKGLERROR
 898                 }
 899                 gl_state.pointer_color = m->pointer_color;
 900                 qglColorPointer(4, GL_FLOAT, sizeof(float[4]), gl_state.pointer_color);
 901                 CHECKGLERROR
 902         }
 903
 904         if (gl_backend_rebindtextures)
 905         {
 906                 gl_backend_rebindtextures = false;
 907                 GL_SetupTextureState();
 908         }
 909
 910         for (i = 0, unit = gl_state.units;i < backendunits;i++, unit++)
 911         {
 912                 if (unit->t1d != m->tex1d[i])
 913                 {
 914                         GL_ActiveTexture(i);
 915                         if (m->tex1d[i])
 916                         {
 917                                 if (unit->t1d == 0)
 918                                         qglEnable(GL_TEXTURE_1D);CHECKGLERROR
 919                         }
 920                         else
 921                         {
 922                                 if (unit->t1d)
 923                                         qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 924                         }
 925                         qglBindTexture(GL_TEXTURE_1D, (unit->t1d = m->tex1d[i]));CHECKGLERROR
 926                 }
 927                 if (unit->t2d != m->tex[i])
 928                 {
 929                         GL_ActiveTexture(i);
 930                         if (m->tex[i])
 931                         {
 932                                 if (unit->t2d == 0)
 933                                         qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 934                         }
 935                         else
 936                         {
 937                                 if (unit->t2d)
 938                                         qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 939                         }
 940                         qglBindTexture(GL_TEXTURE_2D, (unit->t2d = m->tex[i]));CHECKGLERROR
 941                 }
 942                 if (unit->t3d != m->tex3d[i])
 943                 {
 944                         GL_ActiveTexture(i);
 945                         if (m->tex3d[i])
 946                         {
 947                                 if (unit->t3d == 0)
 948                                         qglEnable(GL_TEXTURE_3D);CHECKGLERROR
 949                         }
 950                         else
 951                         {
 952                                 if (unit->t3d)
 953                                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 954                         }
 955                         qglBindTexture(GL_TEXTURE_3D, (unit->t3d = m->tex3d[i]));CHECKGLERROR
 956                 }
 957                 if (unit->tcubemap != m->texcubemap[i])
 958                 {
 959                         GL_ActiveTexture(i);
 960                         if (m->texcubemap[i])
 961                         {
 962                                 if (unit->tcubemap == 0)
 963                                         qglEnable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 964                         }
 965                         else
 966                         {
 967                                 if (unit->tcubemap)
 968                                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 969                         }
 970                         qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, (unit->tcubemap = m->texcubemap[i]));CHECKGLERROR
 971                 }
 972                 combinergb = m->texcombinergb[i];
 973                 if (!combinergb)
 974                         combinergb = GL_MODULATE;
 975                 if (unit->combinergb != combinergb)
 976                 {
 977                         GL_ActiveTexture(i);
 978                         unit->combinergb = combinergb;
 979                         if (gl_combine.integer)
 980                         {
 981                                 qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, unit->combinergb);CHECKGLERROR
 982                         }
 983                         else
 984                         {
 985                                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, unit->combinergb);CHECKGLERROR
 986                         }
 987                 }
 988                 combinealpha = m->texcombinealpha[i];
 989                 if (!combinealpha)
 990                         combinealpha = GL_MODULATE;
 991                 if (unit->combinealpha != combinealpha)
 992                 {
 993                         GL_ActiveTexture(i);
 994                         unit->combinealpha = combinealpha;
 995                         if (gl_combine.integer)
 996                         {
 997                                 qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, unit->combinealpha);CHECKGLERROR
 998                         }
 999                 }
1000                 scale = max(m->texrgbscale[i], 1);
1001                 if (unit->rgbscale != scale)
1002                 {
1003                         GL_ActiveTexture(i);
1004                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, (unit->rgbscale = scale));CHECKGLERROR
1005                 }
1006                 scale = max(m->texalphascale[i], 1);
1007                 if (unit->alphascale != scale)
1008                 {
1009                         GL_ActiveTexture(i);
1010                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, (unit->alphascale = scale));CHECKGLERROR
1011                 }
1012                 if (m->pointer_texcoord3f[i])
1013                 {
1014                         arrayis3d = true;
1015                         texcoords = m->pointer_texcoord3f[i];
1016                 }
1017                 else
1018                 {
1019                         arrayis3d = false;
1020                         texcoords = m->pointer_texcoord[i];
1021                 }
1022                 if (texcoords && !unit->t1d && !unit->t2d && !unit->t3d && !unit->tcubemap)
1023                         texcoords = NULL;
1024                 if (unit->pointer_texcoord != texcoords || unit->arrayis3d != arrayis3d)
1025                 {
1026                         GL_ClientActiveTexture(i);
1027                         if (texcoords)
1028                         {
1029                                 if (!unit->arrayenabled)
1030                                 {
1031                                         unit->arrayenabled = true;
1032                                         qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
1033                                 }
1034                         }
1035                         else
1036                         {
1037                                 if (unit->arrayenabled)
1038                                 {
1039                                         unit->arrayenabled = false;
1040                                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
1041                                 }
1042                         }
1043                         unit->pointer_texcoord = texcoords;
1044                         unit->arrayis3d = arrayis3d;
1045                         if (unit->arrayis3d)
1046                                 qglTexCoordPointer(3, GL_FLOAT, sizeof(float[3]), unit->pointer_texcoord);
1047                         else
1048                                 qglTexCoordPointer(2, GL_FLOAT, sizeof(float[2]), unit->pointer_texcoord);
1049                         CHECKGLERROR
1050                 }
1051                 // if texmatrix is not set (3,3 should always be 1 in a texture matrix) just compare to the identity matrix
1052                 if (m->texmatrix[i].m[3][3])
1053                         texmatrix = &m->texmatrix[i];
1054                 else
1055                         texmatrix = &r_identitymatrix;
1056                 if (memcmp(&unit->matrix, texmatrix, sizeof(matrix4x4_t)))
1057                 {
1058                         unit->matrix = *texmatrix;
1059                         Matrix4x4_Transpose(&tempmatrix, &unit->matrix);
1060                         qglMatrixMode(GL_TEXTURE);
1061                         GL_ActiveTexture(i);
1062                         qglLoadMatrixf(&tempmatrix.m[0][0]);
1063                         qglMatrixMode(GL_MODELVIEW);
1064                 }
1065         }
1066 }
1067
1068 void R_Mesh_Draw_ShowTris(int numverts, int numtriangles, const int *elements)
1069 {
1070         qglBegin(GL_LINES);
1071         for (;numtriangles;numtriangles--, elements += 3)
1072         {
1073                 qglArrayElement(elements[0]);qglArrayElement(elements[1]);
1074                 qglArrayElement(elements[1]);qglArrayElement(elements[2]);
1075                 qglArrayElement(elements[2]);qglArrayElement(elements[0]);
1076         }
1077         qglEnd();
1078         CHECKGLERROR
1079 }
1080
1081 /*
1082 ==============================================================================
1083
1084                                                 SCREEN SHOTS
1085
1086 ==============================================================================
1087 */
1088
1089 qboolean SCR_ScreenShot(char *filename, int x, int y, int width, int height, qboolean jpeg)
1090 {
1091         qboolean ret;
1092         qbyte *buffer;
1093
1094         if (!r_render.integer)
1095                 return false;
1096
1097         buffer = Mem_Alloc(tempmempool, width*height*3);
1098         qglReadPixels (x, y, width, height, GL_RGB, GL_UNSIGNED_BYTE, buffer);
1099         CHECKGLERROR
1100
1101         if (jpeg)
1102                 ret = JPEG_SaveImage_preflipped (filename, width, height, buffer);
1103         else
1104                 ret = Image_WriteTGARGB_preflipped (filename, width, height, buffer);
1105
1106         Mem_Free(buffer);
1107         return ret;
1108 }
1109
1110 //=============================================================================
1111
1112 void R_ClearScreen(void)
1113 {
1114         if (r_render.integer)
1115         {
1116                 // clear to black
1117                 qglClearColor(0,0,0,0);CHECKGLERROR
1118                 qglClearDepth(1);CHECKGLERROR
1119                 if (gl_stencil)
1120                 {
1121                         // LordHavoc: we use a stencil centered around 128 instead of 0,
1122                         // to avoid clamping interfering with strange shadow volume
1123                         // drawing orders
1124                         qglClearStencil(128);CHECKGLERROR
1125                 }
1126                 // clear the screen
1127                 GL_Clear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | (gl_stencil ? GL_STENCIL_BUFFER_BIT : 0));
1128                 // set dithering mode
1129                 if (gl_dither.integer)
1130                 {
1131                         qglEnable(GL_DITHER);CHECKGLERROR
1132                 }
1133                 else
1134                 {
1135                         qglDisable(GL_DITHER);CHECKGLERROR
1136                 }
1137         }
1138 }
1139
1140 /*
1141 ====================
1142 CalcFov
1143 ====================
1144 */
1145 float CalcFov (float fov_x, float width, float height)
1146 {
1147         // calculate vision size and alter by aspect, then convert back to angle
1148         return atan (height / (width / tan(fov_x/360*M_PI))) * 360 / M_PI;
1149 }
1150
1151 /*
1152 ==================
1153 SCR_UpdateScreen
1154
1155 This is called every frame, and can also be called explicitly to flush
1156 text to the screen.
1157 ==================
1158 */
1159 void SCR_UpdateScreen (void)
1160 {
1161         if (gl_delayfinish.integer)
1162         {
1163                 R_Mesh_Finish();
1164                 R_TimeReport("meshfinish");
1165                 VID_Finish();
1166                 R_TimeReport("finish");
1167         }
1168
1169         R_Mesh_Start();
1170
1171         if (r_textureunits.integer > gl_textureunits)
1172                 Cvar_SetValueQuick(&r_textureunits, gl_textureunits);
1173         if (r_textureunits.integer < 1)
1174                 Cvar_SetValueQuick(&r_textureunits, 1);
1175
1176         if (gl_combine.integer && (!gl_combine_extension || r_textureunits.integer < 2))
1177                 Cvar_SetValueQuick(&gl_combine, 0);
1178
1179 showtris:
1180         R_TimeReport("setup");
1181
1182         R_ClearScreen();
1183
1184         R_TimeReport("clear");
1185
1186         if (scr_conlines < vid.conheight && cls.signon == SIGNONS)
1187         {
1188                 float size;
1189                 int contents;
1190
1191                 // bound viewsize
1192                 if (scr_viewsize.value < 30)
1193                         Cvar_Set ("viewsize","30");
1194                 if (scr_viewsize.value > 120)
1195                         Cvar_Set ("viewsize","120");
1196
1197                 // bound field of view
1198                 if (scr_fov.value < 1)
1199                         Cvar_Set ("fov","1");
1200                 if (scr_fov.value > 170)
1201                         Cvar_Set ("fov","170");
1202
1203                 // intermission is always full screen
1204                 if (cl.intermission)
1205                 {
1206                         size = 1;
1207                         sb_lines = 0;
1208                 }
1209                 else
1210                 {
1211                         if (scr_viewsize.value >= 120)
1212                                 sb_lines = 0;           // no status bar at all
1213                         else if (scr_viewsize.value >= 110)
1214                                 sb_lines = 24;          // no inventory
1215                         else
1216                                 sb_lines = 24+16+8;
1217                         size = scr_viewsize.value * (1.0 / 100.0);
1218                         size = min(size, 1);
1219                 }
1220
1221                 r_refdef.width = vid.realwidth * size;
1222                 r_refdef.height = vid.realheight * size;
1223                 r_refdef.x = (vid.realwidth - r_refdef.width)/2;
1224                 r_refdef.y = (vid.realheight - r_refdef.height)/2;
1225
1226                 // LordHavoc: viewzoom (zoom in for sniper rifles, etc)
1227                 r_refdef.fov_x = scr_fov.value * cl.viewzoom;
1228                 r_refdef.fov_y = CalcFov (r_refdef.fov_x, r_refdef.width, r_refdef.height);
1229
1230                 if (cl.worldmodel)
1231                 {
1232                         Mod_CheckLoaded(cl.worldmodel);
1233                         contents = CL_PointSuperContents(r_vieworigin);
1234                         if (contents & SUPERCONTENTS_LIQUIDSMASK)
1235                         {
1236                                 r_refdef.fov_x *= (sin(cl.time * 4.7) * 0.015 + 0.985);
1237                                 r_refdef.fov_y *= (sin(cl.time * 3.0) * 0.015 + 0.985);
1238                         }
1239                 }
1240
1241                 R_RenderView();
1242
1243                 if (scr_zoomwindow.integer)
1244                 {
1245                         float sizex = bound(10, scr_zoomwindow_viewsizex.value, 100) / 100.0;
1246                         float sizey = bound(10, scr_zoomwindow_viewsizey.value, 100) / 100.0;
1247                         r_refdef.width = vid.realwidth * sizex;
1248                         r_refdef.height = vid.realheight * sizey;
1249                         r_refdef.x = (vid.realwidth - r_refdef.width)/2;
1250                         r_refdef.y = 0;
1251                         r_refdef.fov_x = scr_zoomwindow_fov.value;
1252                         r_refdef.fov_y = CalcFov(r_refdef.fov_x, r_refdef.width, r_refdef.height);
1253
1254                         R_RenderView();
1255                 }
1256         }
1257
1258         // draw 2D stuff
1259         R_DrawQueue();
1260
1261         if (r_showtrispass)
1262                 r_showtrispass = false;
1263         else if (r_showtris.value > 0)
1264         {
1265                 rmeshstate_t m;
1266                 GL_BlendFunc(GL_ONE, GL_ONE);
1267                 GL_DepthTest(GL_FALSE);
1268                 GL_DepthMask(GL_FALSE);
1269                 memset(&m, 0, sizeof(m));
1270                 R_Mesh_State(&m);
1271                 r_showtrispass = true;
1272                 GL_ShowTrisColor(0.2,0.2,0.2,1);
1273                 goto showtris;
1274         }
1275
1276         if (gl_delayfinish.integer)
1277         {
1278                 // tell driver to commit it's partially full geometry queue to the rendering queue
1279                 // (this doesn't wait for the commands themselves to complete)
1280                 qglFlush();
1281         }
1282         else
1283         {
1284                 R_Mesh_Finish();
1285                 R_TimeReport("meshfinish");
1286                 VID_Finish();
1287                 R_TimeReport("finish");
1288         }
1289 }
1290
1291
1292 //===========================================================================
1293 // dynamic vertex array buffer subsystem
1294 //===========================================================================
1295
1296 float varray_vertex3f[65536*3];
1297 float varray_color4f[65536*4];
1298 float varray_texcoord2f[4][65536*2];
1299 float varray_texcoord3f[4][65536*3];
1300 float varray_normal3f[65536*3];
1301 int earray_element3i[65536];
1302
1303 //===========================================================================
1304 // vertex array caching subsystem
1305 //===========================================================================
1306
1307 typedef struct rcachearraylink_s
1308 {
1309         struct rcachearraylink_s *next, *prev;
1310         struct rcachearrayitem_s *data;
1311 }
1312 rcachearraylink_t;
1313
1314 typedef struct rcachearrayitem_s
1315 {
1316         // the original request structure
1317         rcachearrayrequest_t request;
1318         // active
1319         int active;
1320         // offset into r_mesh_rcachedata
1321         int offset;
1322         // for linking this into the sequential list
1323         rcachearraylink_t sequentiallink;
1324         // for linking this into the lookup list
1325         rcachearraylink_t hashlink;
1326 }
1327 rcachearrayitem_t;
1328
1329 #define RCACHEARRAY_HASHSIZE 65536
1330 #define RCACHEARRAY_ITEMS 4096
1331 #define RCACHEARRAY_DEFAULTSIZE (4 << 20)
1332
1333 // all active items are linked into this chain in sorted order
1334 static rcachearraylink_t r_mesh_rcachesequentialchain;
1335 // all inactive items are linked into this chain in unknown order
1336 static rcachearraylink_t r_mesh_rcachefreechain;
1337 // all active items are also linked into these chains (using their hashlink)
1338 static rcachearraylink_t r_mesh_rcachechain[RCACHEARRAY_HASHSIZE];
1339
1340 // all items are stored here, whether active or inactive
1341 static rcachearrayitem_t r_mesh_rcacheitems[RCACHEARRAY_ITEMS];
1342
1343 // size of data buffer
1344 static int r_mesh_rcachedata_size = RCACHEARRAY_DEFAULTSIZE;
1345 // data buffer
1346 static qbyte r_mesh_rcachedata[RCACHEARRAY_DEFAULTSIZE];
1347
1348 // current state
1349 static int r_mesh_rcachedata_offset;
1350 static rcachearraylink_t *r_mesh_rcachesequentialchain_current;
1351
1352 static void R_Mesh_CacheArray_Startup(void)
1353 {
1354         int i;
1355         rcachearraylink_t *l;
1356         // prepare all the linked lists
1357         l = &r_mesh_rcachesequentialchain;l->next = l->prev = l;l->data = NULL;
1358         l = &r_mesh_rcachefreechain;l->next = l->prev = l;l->data = NULL;
1359         memset(&r_mesh_rcachechain, 0, sizeof(r_mesh_rcachechain));
1360         for (i = 0;i < RCACHEARRAY_HASHSIZE;i++)
1361         {
1362                 l = &r_mesh_rcachechain[i];
1363                 l->next = l->prev = l;
1364                 l->data = NULL;
1365         }
1366         memset(&r_mesh_rcacheitems, 0, sizeof(r_mesh_rcacheitems));
1367         for (i = 0;i < RCACHEARRAY_ITEMS;i++)
1368         {
1369                 r_mesh_rcacheitems[i].hashlink.data = r_mesh_rcacheitems[i].sequentiallink.data = &r_mesh_rcacheitems[i];
1370                 l = &r_mesh_rcacheitems[i].sequentiallink;
1371                 l->next = &r_mesh_rcachefreechain;
1372                 l->prev = l->next->prev;
1373                 l->next->prev = l->prev->next = l;
1374         }
1375         // clear other state
1376         r_mesh_rcachedata_offset = 0;
1377         r_mesh_rcachesequentialchain_current = &r_mesh_rcachesequentialchain;
1378 }
1379
1380 static void R_Mesh_CacheArray_Shutdown(void)
1381 {
1382 }
1383
1384 /*
1385 static void R_Mesh_CacheArray_ValidateState(int num)
1386 {
1387         rcachearraylink_t *l, *lhead;
1388         lhead = &r_mesh_rcachesequentialchain;
1389         if (r_mesh_rcachesequentialchain_current == lhead)
1390                 return;
1391         for (l = lhead->next;l != lhead;l = l->next)
1392                 if (r_mesh_rcachesequentialchain_current == l)
1393                         return;
1394         Sys_Error("%i", num);
1395 }
1396 */
1397
1398 int R_Mesh_CacheArray(rcachearrayrequest_t *r)
1399 {
1400         rcachearraylink_t *l, *lhead, *lnext;
1401         rcachearrayitem_t *d;
1402         int hashindex, offset, offsetend;
1403
1404         //R_Mesh_CacheArray_ValidateState(3);
1405         // calculate a hashindex to choose a cache chain
1406         r->data = NULL;
1407         hashindex = CRC_Block((void *)r, sizeof(*r)) % RCACHEARRAY_HASHSIZE;
1408
1409         // is it already cached?
1410         for (lhead = &r_mesh_rcachechain[hashindex], l = lhead->next;l != lhead;l = l->next)
1411         {
1412                 if (!memcmp(&l->data->request, r, sizeof(l->data->request)))
1413                 {
1414                         // we have it cached already
1415                         r->data = r_mesh_rcachedata + l->data->offset;
1416                         return false;
1417                 }
1418         }
1419
1420         // we need to add a new cache item, this means finding a place for the new
1421         // data and making sure we have a free item available, lots of work...
1422
1423         // check if buffer needs to wrap
1424         if (r_mesh_rcachedata_offset + r->data_size > r_mesh_rcachedata_size)
1425         {
1426                 /*
1427                 if (r->data_size * 10 > r_mesh_rcachedata_size)
1428                 {
1429                         // realloc whole cache
1430                 }
1431                 */
1432                 // reset back to start
1433                 r_mesh_rcachedata_offset = 0;
1434                 r_mesh_rcachesequentialchain_current = &r_mesh_rcachesequentialchain;
1435         }
1436         offset = r_mesh_rcachedata_offset;
1437         r_mesh_rcachedata_offset += r->data_size;
1438         offsetend = r_mesh_rcachedata_offset;
1439         //R_Mesh_CacheArray_ValidateState(4);
1440
1441         /*
1442         {
1443                 int n;
1444                 for (lhead = &r_mesh_rcachesequentialchain, l = lhead->next, n = 0;l != lhead;l = l->next, n++);
1445                 Con_Printf("R_Mesh_CacheArray: new data range %i:%i, %i items are already linked\n", offset, offsetend, n);
1446         }
1447         */
1448
1449         // make room for the new data (remove old items)
1450         lhead = &r_mesh_rcachesequentialchain;
1451         l = r_mesh_rcachesequentialchain_current;
1452         if (l == lhead)
1453                 l = l->next;
1454         while (l != lhead && l->data->offset < offsetend && l->data->offset + l->data->request.data_size > offset)
1455         {
1456         //r_mesh_rcachesequentialchain_current = l;
1457         //R_Mesh_CacheArray_ValidateState(8);
1458                 lnext = l->next;
1459                 // if at the end of the chain, wrap around
1460                 if (lnext == lhead)
1461                         lnext = lnext->next;
1462         //r_mesh_rcachesequentialchain_current = lnext;
1463         //R_Mesh_CacheArray_ValidateState(10);
1464
1465                 // unlink from sequential chain
1466                 l->next->prev = l->prev;
1467                 l->prev->next = l->next;
1468         //R_Mesh_CacheArray_ValidateState(11);
1469                 // link into free chain
1470                 l->next = &r_mesh_rcachefreechain;
1471                 l->prev = l->next->prev;
1472                 l->next->prev = l->prev->next = l;
1473         //R_Mesh_CacheArray_ValidateState(12);
1474
1475                 l = &l->data->hashlink;
1476                 // unlink from hash chain
1477                 l->next->prev = l->prev;
1478                 l->prev->next = l->next;
1479
1480                 l = lnext;
1481         //r_mesh_rcachesequentialchain_current = l;
1482         //R_Mesh_CacheArray_ValidateState(9);
1483         }
1484         //r_mesh_rcachesequentialchain_current = l;
1485         //R_Mesh_CacheArray_ValidateState(5);
1486         // gobble an extra item if we have no free items available
1487         if (r_mesh_rcachefreechain.next == &r_mesh_rcachefreechain)
1488         {
1489                 lnext = l->next;
1490
1491                 // unlink from sequential chain
1492                 l->next->prev = l->prev;
1493                 l->prev->next = l->next;
1494                 // link into free chain
1495                 l->next = &r_mesh_rcachefreechain;
1496                 l->prev = l->next->prev;
1497                 l->next->prev = l->prev->next = l;
1498
1499                 l = &l->data->hashlink;
1500                 // unlink from hash chain
1501                 l->next->prev = l->prev;
1502                 l->prev->next = l->next;
1503
1504                 l = lnext;
1505         }
1506         r_mesh_rcachesequentialchain_current = l;
1507         //R_Mesh_CacheArray_ValidateState(6);
1508
1509         // now take an item from the free chain
1510         l = r_mesh_rcachefreechain.next;
1511         // set it up
1512         d = l->data;
1513         d->request = *r;
1514         d->offset = offset;
1515         // unlink
1516         l->next->prev = l->prev;
1517         l->prev->next = l->next;
1518         // relink to sequential
1519         l->next = r_mesh_rcachesequentialchain_current->prev;
1520         l->prev = l->next->prev;
1521         while (l->next->data && l->data && l->next->data->offset <= d->offset)
1522         {
1523                 //Con_Print(">\n");
1524                 l->next = l->next->next;
1525                 l->prev = l->prev->next;
1526         }
1527         while (l->prev->data && l->data && l->prev->data->offset >= d->offset)
1528         {
1529                 //Con_Print("<\n");
1530                 l->prev = l->prev->prev;
1531                 l->next = l->next->prev;
1532         }
1533         l->next->prev = l->prev->next = l;
1534         // also link into hash chain
1535         l = &l->data->hashlink;
1536         l->next = &r_mesh_rcachechain[hashindex];
1537         l->prev = l->next->prev;
1538         l->prev->next = l;
1539         l->next->prev = l->prev->next = l;
1540
1541
1542         //r_mesh_rcachesequentialchain_current = d->sequentiallink.next;
1543
1544         //R_Mesh_CacheArray_ValidateState(7);
1545         // and finally set the data pointer
1546         r->data = r_mesh_rcachedata + d->offset;
1547         // and tell the caller to fill the array
1548         return true;
1549 }
1550