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_DPrintf("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_DPrintf("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 depthtest;
 349         int scissortest;
 350         int unit;
 351         int clientunit;
 352         gltextureunit_t units[MAX_TEXTUREUNITS];
 353         float color4f[4];
 354         int lockrange_first;
 355         int lockrange_count;
 356         const void *pointer_vertex;
 357         const void *pointer_color;
 358 }
 359 gl_state;
 360
 361 void GL_SetupTextureState(void)
 362 {
 363         int i;
 364         gltextureunit_t *unit;
 365         gl_state.unit = -1;
 366         gl_state.clientunit = -1;
 367         for (i = 0;i < backendunits;i++)
 368         {
 369                 GL_ActiveTexture(i);
 370                 GL_ClientActiveTexture(i);
 371                 unit = gl_state.units + i;
 372                 unit->t1d = 0;
 373                 unit->t2d = 0;
 374                 unit->t3d = 0;
 375                 unit->tcubemap = 0;
 376                 unit->pointer_texcoord = NULL;
 377                 unit->rgbscale = 1;
 378                 unit->alphascale = 1;
 379                 unit->combinergb = GL_MODULATE;
 380                 unit->combinealpha = GL_MODULATE;
 381
 382                 qglTexCoordPointer(2, GL_FLOAT, sizeof(float[2]), NULL);CHECKGLERROR
 383                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 384
 385                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 386                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 387                 if (gl_texture3d)
 388                 {
 389                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 390                 }
 391                 if (gl_texturecubemap)
 392                 {
 393                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 394                 }
 395                 if (gl_combine.integer)
 396                 {
 397                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);CHECKGLERROR
 398                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_MODULATE);CHECKGLERROR
 399                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE);CHECKGLERROR
 400                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 401                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_RGB_ARB, GL_TEXTURE);CHECKGLERROR // for GL_INTERPOLATE_ARB mode
 402                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 403                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 404                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_RGB_ARB, GL_SRC_ALPHA);CHECKGLERROR
 405                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, GL_MODULATE);CHECKGLERROR
 406                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA_ARB, GL_TEXTURE);CHECKGLERROR
 407                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_ALPHA_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 408                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_ALPHA_ARB, GL_CONSTANT_ARB);CHECKGLERROR
 409                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 410                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 411                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 412                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
 413                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
 414                 }
 415                 else
 416                 {
 417                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 418                 }
 419         }
 420 }
 421
 422 void GL_Backend_ResetState(void)
 423 {
 424         memset(&gl_state, 0, sizeof(gl_state));
 425         gl_state.depthtest = true;
 426         gl_state.blendfunc1 = GL_ONE;
 427         gl_state.blendfunc2 = GL_ZERO;
 428         gl_state.blend = false;
 429         gl_state.depthmask = GL_TRUE;
 430         gl_state.color4f[0] = gl_state.color4f[1] = gl_state.color4f[2] = gl_state.color4f[3] = 1;
 431         gl_state.lockrange_first = 0;
 432         gl_state.lockrange_count = 0;
 433         gl_state.pointer_vertex = NULL;
 434         gl_state.pointer_color = NULL;
 435
 436         CHECKGLERROR
 437
 438         qglEnable(GL_CULL_FACE);CHECKGLERROR
 439         qglCullFace(GL_FRONT);CHECKGLERROR
 440         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 441         qglBlendFunc(gl_state.blendfunc1, gl_state.blendfunc2);CHECKGLERROR
 442         qglDisable(GL_BLEND);CHECKGLERROR
 443         qglDepthMask(gl_state.depthmask);CHECKGLERROR
 444
 445         qglVertexPointer(3, GL_FLOAT, sizeof(float[3]), NULL);CHECKGLERROR
 446         qglEnableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 447
 448         qglColorPointer(4, GL_FLOAT, sizeof(float[4]), NULL);CHECKGLERROR
 449         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 450
 451         GL_Color(0, 0, 0, 0);
 452         GL_Color(1, 1, 1, 1);
 453
 454         GL_SetupTextureState();
 455 }
 456
 457 void GL_ActiveTexture(int num)
 458 {
 459         if (gl_state.unit != num)
 460         {
 461                 gl_state.unit = num;
 462                 if (qglActiveTexture)
 463                 {
 464                         qglActiveTexture(GL_TEXTURE0_ARB + gl_state.unit);
 465                         CHECKGLERROR
 466                 }
 467         }
 468 }
 469
 470 void GL_ClientActiveTexture(int num)
 471 {
 472         if (gl_state.clientunit != num)
 473         {
 474                 gl_state.clientunit = num;
 475                 if (qglActiveTexture)
 476                 {
 477                         qglClientActiveTexture(GL_TEXTURE0_ARB + gl_state.clientunit);
 478                         CHECKGLERROR
 479                 }
 480         }
 481 }
 482
 483 void GL_BlendFunc(int blendfunc1, int blendfunc2)
 484 {
 485         if (gl_state.blendfunc1 != blendfunc1 || gl_state.blendfunc2 != blendfunc2)
 486         {
 487                 if (r_showtrispass)
 488                         return;
 489                 qglBlendFunc(gl_state.blendfunc1 = blendfunc1, gl_state.blendfunc2 = blendfunc2);CHECKGLERROR
 490                 if (gl_state.blendfunc2 == GL_ZERO)
 491                 {
 492                         if (gl_state.blendfunc1 == GL_ONE)
 493                         {
 494                                 if (gl_state.blend)
 495                                 {
 496                                         gl_state.blend = 0;
 497                                         qglDisable(GL_BLEND);CHECKGLERROR
 498                                 }
 499                         }
 500                         else
 501                         {
 502                                 if (!gl_state.blend)
 503                                 {
 504                                         gl_state.blend = 1;
 505                                         qglEnable(GL_BLEND);CHECKGLERROR
 506                                 }
 507                         }
 508                 }
 509                 else
 510                 {
 511                         if (!gl_state.blend)
 512                         {
 513                                 gl_state.blend = 1;
 514                                 qglEnable(GL_BLEND);CHECKGLERROR
 515                         }
 516                 }
 517         }
 518 }
 519
 520 void GL_DepthMask(int state)
 521 {
 522         if (gl_state.depthmask != state)
 523         {
 524                 if (r_showtrispass)
 525                         return;
 526                 qglDepthMask(gl_state.depthmask = state);CHECKGLERROR
 527         }
 528 }
 529
 530 void GL_DepthTest(int state)
 531 {
 532         if (gl_state.depthtest != state)
 533         {
 534                 if (r_showtrispass)
 535                         return;
 536                 gl_state.depthtest = state;
 537                 if (gl_state.depthtest)
 538                 {
 539                         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 540                 }
 541                 else
 542                 {
 543                         qglDisable(GL_DEPTH_TEST);CHECKGLERROR
 544                 }
 545         }
 546 }
 547
 548 void GL_VertexPointer(const float *p)
 549 {
 550         if (gl_state.pointer_vertex != p)
 551         {
 552                 gl_state.pointer_vertex = p;
 553                 CHECKGLERROR
 554                 qglVertexPointer(3, GL_FLOAT, sizeof(float[3]), gl_state.pointer_vertex);
 555                 CHECKGLERROR
 556         }
 557 }
 558
 559 void GL_ColorPointer(const float *p)
 560 {
 561         if (gl_state.pointer_color != p)
 562         {
 563                 if (r_showtrispass)
 564                         return;
 565                 CHECKGLERROR
 566                 if (!gl_state.pointer_color)
 567                 {
 568                         qglEnableClientState(GL_COLOR_ARRAY);
 569                         CHECKGLERROR
 570                 }
 571                 else if (!p)
 572                 {
 573                         qglDisableClientState(GL_COLOR_ARRAY);
 574                         CHECKGLERROR
 575                 }
 576                 gl_state.pointer_color = p;
 577                 qglColorPointer(4, GL_FLOAT, sizeof(float[4]), gl_state.pointer_color);
 578                 CHECKGLERROR
 579         }
 580 }
 581
 582 void GL_Color(float cr, float cg, float cb, float ca)
 583 {
 584         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)
 585         {
 586                 if (r_showtrispass)
 587                         return;
 588                 GL_ColorPointer(NULL);
 589                 gl_state.color4f[0] = cr;
 590                 gl_state.color4f[1] = cg;
 591                 gl_state.color4f[2] = cb;
 592                 gl_state.color4f[3] = ca;
 593                 CHECKGLERROR
 594                 qglColor4f(cr, cg, cb, ca);
 595                 CHECKGLERROR
 596         }
 597 }
 598
 599 void GL_LockArrays(int first, int count)
 600 {
 601         if (gl_state.lockrange_count != count || gl_state.lockrange_first != first)
 602         {
 603                 if (gl_state.lockrange_count)
 604                 {
 605                         gl_state.lockrange_count = 0;
 606                         CHECKGLERROR
 607                         qglUnlockArraysEXT();
 608                         CHECKGLERROR
 609                 }
 610                 if (count && gl_supportslockarrays && gl_lockarrays.integer)
 611                 {
 612                         gl_state.lockrange_first = first;
 613                         gl_state.lockrange_count = count;
 614                         CHECKGLERROR
 615                         qglLockArraysEXT(first, count);
 616                         CHECKGLERROR
 617                 }
 618         }
 619 }
 620
 621 void GL_Scissor (int x, int y, int width, int height)
 622 {
 623         CHECKGLERROR
 624         qglScissor(x, vid.realheight - (y + height),width,height);
 625         CHECKGLERROR
 626 }
 627
 628 void GL_ScissorTest(int state)
 629 {
 630         if(gl_state.scissortest == state)
 631                 return;
 632
 633         CHECKGLERROR
 634         if((gl_state.scissortest = state))
 635                 qglEnable(GL_SCISSOR_TEST);
 636         else
 637                 qglDisable(GL_SCISSOR_TEST);
 638         CHECKGLERROR
 639 }
 640
 641 void GL_TransformToScreen(const vec4_t in, vec4_t out)
 642 {
 643         vec4_t temp;
 644         float iw;
 645         Matrix4x4_Transform4 (&backend_viewmatrix, in, temp);
 646         Matrix4x4_Transform4 (&backend_projectmatrix, temp, out);
 647         iw = 1.0f / out[3];
 648         out[0] = r_view_x + (out[0] * iw + 1.0f) * r_view_width * 0.5f;
 649         out[1] = r_view_y + (out[1] * iw + 1.0f) * r_view_height * 0.5f;
 650         out[2] = out[2] * iw;
 651 }
 652
 653 // called at beginning of frame
 654 void R_Mesh_Start(void)
 655 {
 656         BACKENDACTIVECHECK
 657         CHECKGLERROR
 658         GL_Backend_ResetState();
 659 }
 660
 661 int gl_backend_rebindtextures;
 662
 663 void GL_Backend_RenumberElements(int *out, int count, const int *in, int offset)
 664 {
 665         int i;
 666         if (offset)
 667         {
 668                 for (i = 0;i < count;i++)
 669                         *out++ = *in++ + offset;
 670         }
 671         else
 672                 memcpy(out, in, sizeof(*out) * count);
 673 }
 674
 675 // renders triangles using vertices from the active arrays
 676 int paranoidblah = 0;
 677 void R_Mesh_Draw(int numverts, int numtriangles, const int *elements)
 678 {
 679         int numelements = numtriangles * 3;
 680         if (numverts == 0 || numtriangles == 0)
 681         {
 682                 Con_Printf("R_Mesh_Draw(%d, %d, %08p);\n", numverts, numtriangles, elements);
 683                 return;
 684         }
 685         if (r_showtrispass)
 686         {
 687                 R_Mesh_Draw_ShowTris(numverts, numtriangles, elements);
 688                 return;
 689         }
 690         c_meshs++;
 691         c_meshelements += numelements;
 692         CHECKGLERROR
 693         if (r_render.integer)
 694         {
 695                 if (gl_paranoid.integer)
 696                 {
 697                         int i, j, size;
 698                         const int *p;
 699                         if (!qglIsEnabled(GL_VERTEX_ARRAY))
 700                                 Con_Printf("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_Printf("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_Printf("R_Mesh_Draw: array enabled but no texture bound\n");
 716                                         GL_ActiveTexture(i);
 717                                         if (!qglIsEnabled(GL_TEXTURE_COORD_ARRAY))
 718                                                 Con_Printf("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                 }
 732                 CHECKGLERROR
 733                 GL_LockArrays(0, numverts);
 734                 CHECKGLERROR
 735                 if (gl_mesh_testmanualfeeding.integer)
 736                 {
 737                         int i, j;
 738                         const GLfloat *p;
 739                         qglBegin(GL_TRIANGLES);
 740                         for (i = 0;i < numtriangles * 3;i++)
 741                         {
 742                                 for (j = 0;j < backendunits;j++)
 743                                 {
 744                                         if (gl_state.units[j].pointer_texcoord)
 745                                         {
 746                                                 if (backendunits > 1)
 747                                                 {
 748                                                         if (gl_state.units[j].t3d || gl_state.units[j].tcubemap)
 749                                                         {
 750                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 3;
 751                                                                 qglMultiTexCoord3f(GL_TEXTURE0_ARB + j, p[0], p[1], p[2]);
 752                                                         }
 753                                                         else
 754                                                         {
 755                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 2;
 756                                                                 qglMultiTexCoord2f(GL_TEXTURE0_ARB + j, p[0], p[1]);
 757                                                         }
 758                                                 }
 759                                                 else
 760                                                 {
 761                                                         if (gl_state.units[j].t3d || gl_state.units[j].tcubemap)
 762                                                         {
 763                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 3;
 764                                                                 qglTexCoord3f(p[0], p[1], p[2]);
 765                                                         }
 766                                                         else
 767                                                         {
 768                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 2;
 769                                                                 qglTexCoord2f(p[0], p[1]);
 770                                                         }
 771                                                 }
 772                                         }
 773                                 }
 774                                 if (gl_state.pointer_color)
 775                                 {
 776                                         p = ((const GLfloat *)(gl_state.pointer_color)) + elements[i] * 4;
 777                                         qglColor4f(p[0], p[1], p[2], p[3]);
 778                                 }
 779                                 p = ((const GLfloat *)(gl_state.pointer_vertex)) + elements[i] * 3;
 780                                 qglVertex3f(p[0], p[1], p[2]);
 781                         }
 782                         qglEnd();
 783                         CHECKGLERROR
 784                 }
 785                 else if (gl_mesh_testarrayelement.integer)
 786                 {
 787                         int i;
 788                         qglBegin(GL_TRIANGLES);
 789                         for (i = 0;i < numtriangles * 3;i++)
 790                         {
 791                                 qglArrayElement(elements[i]);
 792                         }
 793                         qglEnd();
 794                         CHECKGLERROR
 795                 }
 796                 else if (gl_mesh_drawrangeelements.integer && qglDrawRangeElements != NULL)
 797                 {
 798                         qglDrawRangeElements(GL_TRIANGLES, 0, numverts, numelements, GL_UNSIGNED_INT, elements);CHECKGLERROR
 799                 }
 800                 else
 801                 {
 802                         qglDrawElements(GL_TRIANGLES, numelements, GL_UNSIGNED_INT, elements);CHECKGLERROR
 803                 }
 804                 CHECKGLERROR
 805                 GL_LockArrays(0, 0);
 806                 CHECKGLERROR
 807         }
 808 }
 809
 810 // restores backend state, used when done with 3D rendering
 811 void R_Mesh_Finish(void)
 812 {
 813         int i;
 814         BACKENDACTIVECHECK
 815         CHECKGLERROR
 816         GL_LockArrays(0, 0);
 817         CHECKGLERROR
 818
 819         for (i = backendunits - 1;i >= 0;i--)
 820         {
 821                 if (qglActiveTexture)
 822                         qglActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
 823                 if (qglClientActiveTexture)
 824                         qglClientActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
 825                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 826                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 827                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 828                 if (gl_texture3d)
 829                 {
 830                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 831                 }
 832                 if (gl_texturecubemap)
 833                 {
 834                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 835                 }
 836                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 837                 if (gl_combine.integer)
 838                 {
 839                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
 840                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
 841                 }
 842         }
 843         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 844         qglDisableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 845
 846         qglDisable(GL_BLEND);CHECKGLERROR
 847         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 848         qglDepthMask(GL_TRUE);CHECKGLERROR
 849         qglBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);CHECKGLERROR
 850 }
 851
 852 void R_Mesh_Matrix(const matrix4x4_t *matrix)
 853 {
 854         if (memcmp(matrix, &backend_modelmatrix, sizeof(matrix4x4_t)))
 855         {
 856                 backend_modelmatrix = *matrix;
 857                 Matrix4x4_Concat(&backend_modelviewmatrix, &backend_viewmatrix, matrix);
 858                 Matrix4x4_Transpose(&backend_glmodelviewmatrix, &backend_modelviewmatrix);
 859                 qglLoadMatrixf(&backend_glmodelviewmatrix.m[0][0]);
 860         }
 861 }
 862
 863 void R_Mesh_TextureMatrix(int unitnumber, const matrix4x4_t *matrix)
 864 {
 865         if (memcmp(&gl_state.units[unitnumber].matrix, matrix, sizeof(matrix4x4_t)))
 866         {
 867                 matrix4x4_t tempmatrix;
 868                 gl_state.units[unitnumber].matrix = *matrix;
 869                 Matrix4x4_Transpose(&tempmatrix, &gl_state.units[unitnumber].matrix);
 870                 qglMatrixMode(GL_TEXTURE);
 871                 GL_ActiveTexture(unitnumber);
 872                 qglLoadMatrixf(&tempmatrix.m[0][0]);
 873                 qglMatrixMode(GL_MODELVIEW);
 874         }
 875 }
 876
 877 void R_Mesh_State_Texture(const rmeshstate_t *m)
 878 {
 879         int i, combinergb, combinealpha, scale, arrayis3d;
 880         gltextureunit_t *unit;
 881
 882         BACKENDACTIVECHECK
 883
 884         if (gl_backend_rebindtextures)
 885         {
 886                 gl_backend_rebindtextures = false;
 887                 GL_SetupTextureState();
 888         }
 889
 890         if (r_showtrispass)
 891                 return;
 892         for (i = 0, unit = gl_state.units;i < backendunits;i++, unit++)
 893         {
 894                 if (unit->t1d != m->tex1d[i])
 895                 {
 896                         GL_ActiveTexture(i);
 897                         if (m->tex1d[i])
 898                         {
 899                                 if (unit->t1d == 0)
 900                                         qglEnable(GL_TEXTURE_1D);CHECKGLERROR
 901                         }
 902                         else
 903                         {
 904                                 if (unit->t1d)
 905                                         qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 906                         }
 907                         qglBindTexture(GL_TEXTURE_1D, (unit->t1d = m->tex1d[i]));CHECKGLERROR
 908                 }
 909                 if (unit->t2d != m->tex[i])
 910                 {
 911                         GL_ActiveTexture(i);
 912                         if (m->tex[i])
 913                         {
 914                                 if (unit->t2d == 0)
 915                                         qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 916                         }
 917                         else
 918                         {
 919                                 if (unit->t2d)
 920                                         qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 921                         }
 922                         qglBindTexture(GL_TEXTURE_2D, (unit->t2d = m->tex[i]));CHECKGLERROR
 923                 }
 924                 if (unit->t3d != m->tex3d[i])
 925                 {
 926                         GL_ActiveTexture(i);
 927                         if (m->tex3d[i])
 928                         {
 929                                 if (unit->t3d == 0)
 930                                         qglEnable(GL_TEXTURE_3D);CHECKGLERROR
 931                         }
 932                         else
 933                         {
 934                                 if (unit->t3d)
 935                                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 936                         }
 937                         qglBindTexture(GL_TEXTURE_3D, (unit->t3d = m->tex3d[i]));CHECKGLERROR
 938                 }
 939                 if (unit->tcubemap != m->texcubemap[i])
 940                 {
 941                         GL_ActiveTexture(i);
 942                         if (m->texcubemap[i])
 943                         {
 944                                 if (unit->tcubemap == 0)
 945                                         qglEnable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 946                         }
 947                         else
 948                         {
 949                                 if (unit->tcubemap)
 950                                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 951                         }
 952                         qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, (unit->tcubemap = m->texcubemap[i]));CHECKGLERROR
 953                 }
 954                 combinergb = m->texcombinergb[i];
 955                 if (!combinergb)
 956                         combinergb = GL_MODULATE;
 957                 if (unit->combinergb != combinergb)
 958                 {
 959                         GL_ActiveTexture(i);
 960                         unit->combinergb = combinergb;
 961                         if (gl_combine.integer)
 962                         {
 963                                 qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, unit->combinergb);CHECKGLERROR
 964                         }
 965                         else
 966                         {
 967                                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, unit->combinergb);CHECKGLERROR
 968                         }
 969                 }
 970                 combinealpha = m->texcombinealpha[i];
 971                 if (!combinealpha)
 972                         combinealpha = GL_MODULATE;
 973                 if (unit->combinealpha != combinealpha)
 974                 {
 975                         GL_ActiveTexture(i);
 976                         unit->combinealpha = combinealpha;
 977                         if (gl_combine.integer)
 978                         {
 979                                 qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, unit->combinealpha);CHECKGLERROR
 980                         }
 981                 }
 982                 scale = max(m->texrgbscale[i], 1);
 983                 if (unit->rgbscale != scale)
 984                 {
 985                         GL_ActiveTexture(i);
 986                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, (unit->rgbscale = scale));CHECKGLERROR
 987                 }
 988                 scale = max(m->texalphascale[i], 1);
 989                 if (unit->alphascale != scale)
 990                 {
 991                         GL_ActiveTexture(i);
 992                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, (unit->alphascale = scale));CHECKGLERROR
 993                 }
 994                 arrayis3d = unit->t3d || unit->tcubemap;
 995                 if (unit->pointer_texcoord != m->pointer_texcoord[i] || unit->arrayis3d != arrayis3d)
 996                 {
 997                         GL_ClientActiveTexture(i);
 998                         if (m->pointer_texcoord[i])
 999                         {
1000                                 if (!unit->arrayenabled)
1001                                 {
1002                                         unit->arrayenabled = true;
1003                                         qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
1004                                 }
1005                         }
1006                         else
1007                         {
1008                                 if (unit->arrayenabled)
1009                                 {
1010                                         unit->arrayenabled = false;
1011                                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
1012                                 }
1013                         }
1014                         unit->pointer_texcoord = m->pointer_texcoord[i];
1015                         unit->arrayis3d = arrayis3d;
1016                         if (unit->arrayis3d)
1017                                 qglTexCoordPointer(3, GL_FLOAT, sizeof(float[3]), unit->pointer_texcoord);
1018                         else
1019                                 qglTexCoordPointer(2, GL_FLOAT, sizeof(float[2]), unit->pointer_texcoord);
1020                         CHECKGLERROR
1021                 }
1022         }
1023 }
1024
1025 void R_Mesh_Draw_ShowTris(int numverts, int numtriangles, const int *elements)
1026 {
1027         qglBegin(GL_LINES);
1028         for (;numtriangles;numtriangles--, elements += 3)
1029         {
1030                 qglArrayElement(elements[0]);qglArrayElement(elements[1]);
1031                 qglArrayElement(elements[1]);qglArrayElement(elements[2]);
1032                 qglArrayElement(elements[2]);qglArrayElement(elements[0]);
1033         }
1034         qglEnd();
1035         CHECKGLERROR
1036 }
1037
1038 /*
1039 ==============================================================================
1040
1041                                                 SCREEN SHOTS
1042
1043 ==============================================================================
1044 */
1045
1046 qboolean SCR_ScreenShot(char *filename, int x, int y, int width, int height, qboolean jpeg)
1047 {
1048         qboolean ret;
1049         qbyte *buffer;
1050
1051         if (!r_render.integer)
1052                 return false;
1053
1054         buffer = Mem_Alloc(tempmempool, width*height*3);
1055         qglReadPixels (x, y, width, height, GL_RGB, GL_UNSIGNED_BYTE, buffer);
1056         CHECKGLERROR
1057
1058         if (jpeg)
1059                 ret = JPEG_SaveImage_preflipped (filename, width, height, buffer);
1060         else
1061                 ret = Image_WriteTGARGB_preflipped (filename, width, height, buffer);
1062
1063         Mem_Free(buffer);
1064         return ret;
1065 }
1066
1067 //=============================================================================
1068
1069 void R_ClearScreen(void)
1070 {
1071         if (r_render.integer)
1072         {
1073                 // clear to black
1074                 qglClearColor(0,0,0,0);CHECKGLERROR
1075                 qglClearDepth(1);CHECKGLERROR
1076                 if (gl_stencil)
1077                 {
1078                         // LordHavoc: we use a stencil centered around 128 instead of 0,
1079                         // to avoid clamping interfering with strange shadow volume
1080                         // drawing orders
1081                         qglClearStencil(128);CHECKGLERROR
1082                 }
1083                 // clear the screen
1084                 qglClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | (gl_stencil ? GL_STENCIL_BUFFER_BIT : 0));CHECKGLERROR
1085                 // set dithering mode
1086                 if (gl_dither.integer)
1087                 {
1088                         qglEnable(GL_DITHER);CHECKGLERROR
1089                 }
1090                 else
1091                 {
1092                         qglDisable(GL_DITHER);CHECKGLERROR
1093                 }
1094         }
1095 }
1096
1097 /*
1098 ====================
1099 CalcFov
1100 ====================
1101 */
1102 float CalcFov (float fov_x, float width, float height)
1103 {
1104         // calculate vision size and alter by aspect, then convert back to angle
1105         return atan (height / (width / tan(fov_x/360*M_PI))) * 360 / M_PI;
1106 }
1107
1108 /*
1109 ==================
1110 SCR_UpdateScreen
1111
1112 This is called every frame, and can also be called explicitly to flush
1113 text to the screen.
1114 ==================
1115 */
1116 void SCR_UpdateScreen (void)
1117 {
1118         if (gl_delayfinish.integer)
1119         {
1120                 VID_Finish ();
1121
1122                 R_TimeReport("finish");
1123         }
1124
1125         if (r_textureunits.integer > gl_textureunits)
1126                 Cvar_SetValueQuick(&r_textureunits, gl_textureunits);
1127         if (r_textureunits.integer < 1)
1128                 Cvar_SetValueQuick(&r_textureunits, 1);
1129
1130         if (gl_combine.integer && (!gl_combine_extension || r_textureunits.integer < 2))
1131                 Cvar_SetValueQuick(&gl_combine, 0);
1132
1133         R_TimeReport("setup");
1134
1135         R_ClearScreen();
1136
1137         R_TimeReport("clear");
1138
1139         if (scr_conlines < vid.conheight && cls.signon == SIGNONS)
1140         {
1141                 float size;
1142                 int contents;
1143
1144                 // bound viewsize
1145                 if (scr_viewsize.value < 30)
1146                         Cvar_Set ("viewsize","30");
1147                 if (scr_viewsize.value > 120)
1148                         Cvar_Set ("viewsize","120");
1149
1150                 // bound field of view
1151                 if (scr_fov.value < 1)
1152                         Cvar_Set ("fov","1");
1153                 if (scr_fov.value > 170)
1154                         Cvar_Set ("fov","170");
1155
1156                 // intermission is always full screen
1157                 if (cl.intermission)
1158                 {
1159                         size = 1;
1160                         sb_lines = 0;
1161                 }
1162                 else
1163                 {
1164                         if (scr_viewsize.value >= 120)
1165                                 sb_lines = 0;           // no status bar at all
1166                         else if (scr_viewsize.value >= 110)
1167                                 sb_lines = 24;          // no inventory
1168                         else
1169                                 sb_lines = 24+16+8;
1170                         size = scr_viewsize.value * (1.0 / 100.0);
1171                         size = min(size, 1);
1172                 }
1173
1174                 r_refdef.width = vid.realwidth * size;
1175                 r_refdef.height = vid.realheight * size;
1176                 r_refdef.x = (vid.realwidth - r_refdef.width)/2;
1177                 r_refdef.y = (vid.realheight - r_refdef.height)/2;
1178
1179                 // LordHavoc: viewzoom (zoom in for sniper rifles, etc)
1180                 r_refdef.fov_x = scr_fov.value * cl.viewzoom;
1181                 r_refdef.fov_y = CalcFov (r_refdef.fov_x, r_refdef.width, r_refdef.height);
1182
1183                 if (cl.worldmodel)
1184                 {
1185                         Mod_CheckLoaded(cl.worldmodel);
1186                         contents = CL_PointSuperContents(r_vieworigin);
1187                         if (contents & SUPERCONTENTS_LIQUIDSMASK)
1188                         {
1189                                 r_refdef.fov_x *= (sin(cl.time * 4.7) * 0.015 + 0.985);
1190                                 r_refdef.fov_y *= (sin(cl.time * 3.0) * 0.015 + 0.985);
1191                         }
1192                 }
1193
1194                 R_RenderView();
1195
1196                 if (scr_zoomwindow.integer)
1197                 {
1198                         float sizex = bound(10, scr_zoomwindow_viewsizex.value, 100) / 100.0;
1199                         float sizey = bound(10, scr_zoomwindow_viewsizey.value, 100) / 100.0;
1200                         r_refdef.width = vid.realwidth * sizex;
1201                         r_refdef.height = vid.realheight * sizey;
1202                         r_refdef.x = (vid.realwidth - r_refdef.width)/2;
1203                         r_refdef.y = 0;
1204                         r_refdef.fov_x = scr_zoomwindow_fov.value;
1205                         r_refdef.fov_y = CalcFov(r_refdef.fov_x, r_refdef.width, r_refdef.height);
1206
1207                         R_RenderView();
1208                 }
1209         }
1210
1211         // draw 2D stuff
1212         R_DrawQueue();
1213
1214         if (gl_delayfinish.integer)
1215         {
1216                 // tell driver to commit it's partially full geometry queue to the rendering queue
1217                 // (this doesn't wait for the commands themselves to complete)
1218                 qglFlush();
1219         }
1220         else
1221         {
1222                 VID_Finish ();
1223
1224                 R_TimeReport("finish");
1225         }
1226 }
1227
1228
1229 //===========================================================================
1230 // dynamic vertex array buffer subsystem
1231 //===========================================================================
1232
1233 float varray_vertex3f[65536*3];
1234 float varray_color4f[65536*4];
1235 float varray_texcoord2f[4][65536*2];
1236 float varray_texcoord3f[4][65536*3];
1237 float varray_normal3f[65536*3];
1238 int earray_element3i[65536];
1239
1240 //===========================================================================
1241 // vertex array caching subsystem
1242 //===========================================================================
1243
1244 typedef struct rcachearraylink_s
1245 {
1246         struct rcachearraylink_s *next, *prev;
1247         struct rcachearrayitem_s *data;
1248 }
1249 rcachearraylink_t;
1250
1251 typedef struct rcachearrayitem_s
1252 {
1253         // the original request structure
1254         rcachearrayrequest_t request;
1255         // active
1256         int active;
1257         // offset into r_mesh_rcachedata
1258         int offset;
1259         // for linking this into the sequential list
1260         rcachearraylink_t sequentiallink;
1261         // for linking this into the lookup list
1262         rcachearraylink_t hashlink;
1263 }
1264 rcachearrayitem_t;
1265
1266 #define RCACHEARRAY_HASHSIZE 65536
1267 #define RCACHEARRAY_ITEMS 4096
1268 #define RCACHEARRAY_DEFAULTSIZE (4 << 20)
1269
1270 // all active items are linked into this chain in sorted order
1271 static rcachearraylink_t r_mesh_rcachesequentialchain;
1272 // all inactive items are linked into this chain in unknown order
1273 static rcachearraylink_t r_mesh_rcachefreechain;
1274 // all active items are also linked into these chains (using their hashlink)
1275 static rcachearraylink_t r_mesh_rcachechain[RCACHEARRAY_HASHSIZE];
1276
1277 // all items are stored here, whether active or inactive
1278 static rcachearrayitem_t r_mesh_rcacheitems[RCACHEARRAY_ITEMS];
1279
1280 // size of data buffer
1281 static int r_mesh_rcachedata_size = RCACHEARRAY_DEFAULTSIZE;
1282 // data buffer
1283 static qbyte r_mesh_rcachedata[RCACHEARRAY_DEFAULTSIZE];
1284
1285 // current state
1286 static int r_mesh_rcachedata_offset;
1287 static rcachearraylink_t *r_mesh_rcachesequentialchain_current;
1288
1289 static void R_Mesh_CacheArray_Startup(void)
1290 {
1291         int i;
1292         rcachearraylink_t *l;
1293         // prepare all the linked lists
1294         l = &r_mesh_rcachesequentialchain;l->next = l->prev = l;l->data = NULL;
1295         l = &r_mesh_rcachefreechain;l->next = l->prev = l;l->data = NULL;
1296         memset(&r_mesh_rcachechain, 0, sizeof(r_mesh_rcachechain));
1297         for (i = 0;i < RCACHEARRAY_HASHSIZE;i++)
1298         {
1299                 l = &r_mesh_rcachechain[i];
1300                 l->next = l->prev = l;
1301                 l->data = NULL;
1302         }
1303         memset(&r_mesh_rcacheitems, 0, sizeof(r_mesh_rcacheitems));
1304         for (i = 0;i < RCACHEARRAY_ITEMS;i++)
1305         {
1306                 r_mesh_rcacheitems[i].hashlink.data = r_mesh_rcacheitems[i].sequentiallink.data = &r_mesh_rcacheitems[i];
1307                 l = &r_mesh_rcacheitems[i].sequentiallink;
1308                 l->next = &r_mesh_rcachefreechain;
1309                 l->prev = l->next->prev;
1310                 l->next->prev = l->prev->next = l;
1311         }
1312         // clear other state
1313         r_mesh_rcachedata_offset = 0;
1314         r_mesh_rcachesequentialchain_current = &r_mesh_rcachesequentialchain;
1315 }
1316
1317 static void R_Mesh_CacheArray_Shutdown(void)
1318 {
1319 }
1320
1321 /*
1322 static void R_Mesh_CacheArray_ValidateState(int num)
1323 {
1324         rcachearraylink_t *l, *lhead;
1325         lhead = &r_mesh_rcachesequentialchain;
1326         if (r_mesh_rcachesequentialchain_current == lhead)
1327                 return;
1328         for (l = lhead->next;l != lhead;l = l->next)
1329                 if (r_mesh_rcachesequentialchain_current == l)
1330                         return;
1331         Sys_Error("%i", num);
1332 }
1333 */
1334
1335 int R_Mesh_CacheArray(rcachearrayrequest_t *r)
1336 {
1337         rcachearraylink_t *l, *lhead, *lnext;
1338         rcachearrayitem_t *d;
1339         int hashindex, offset, offsetend;
1340
1341         //R_Mesh_CacheArray_ValidateState(3);
1342         // calculate a hashindex to choose a cache chain
1343         r->data = NULL;
1344         hashindex = CRC_Block((void *)r, sizeof(*r)) % RCACHEARRAY_HASHSIZE;
1345
1346         // is it already cached?
1347         for (lhead = &r_mesh_rcachechain[hashindex], l = lhead->next;l != lhead;l = l->next)
1348         {
1349                 if (!memcmp(&l->data->request, r, sizeof(l->data->request)))
1350                 {
1351                         // we have it cached already
1352                         r->data = r_mesh_rcachedata + l->data->offset;
1353                         return false;
1354                 }
1355         }
1356
1357         // we need to add a new cache item, this means finding a place for the new
1358         // data and making sure we have a free item available, lots of work...
1359
1360         // check if buffer needs to wrap
1361         if (r_mesh_rcachedata_offset + r->data_size > r_mesh_rcachedata_size)
1362         {
1363                 /*
1364                 if (r->data_size * 10 > r_mesh_rcachedata_size)
1365                 {
1366                         // realloc whole cache
1367                 }
1368                 */
1369                 // reset back to start
1370                 r_mesh_rcachedata_offset = 0;
1371                 r_mesh_rcachesequentialchain_current = &r_mesh_rcachesequentialchain;
1372         }
1373         offset = r_mesh_rcachedata_offset;
1374         r_mesh_rcachedata_offset += r->data_size;
1375         offsetend = r_mesh_rcachedata_offset;
1376         //R_Mesh_CacheArray_ValidateState(4);
1377
1378         /*
1379         {
1380                 int n;
1381                 for (lhead = &r_mesh_rcachesequentialchain, l = lhead->next, n = 0;l != lhead;l = l->next, n++);
1382                 Con_Printf("R_Mesh_CacheArray: new data range %i:%i, %i items are already linked\n", offset, offsetend, n);
1383         }
1384         */
1385
1386         // make room for the new data (remove old items)
1387         lhead = &r_mesh_rcachesequentialchain;
1388         l = r_mesh_rcachesequentialchain_current;
1389         if (l == lhead)
1390                 l = l->next;
1391         while (l != lhead && l->data->offset < offsetend && l->data->offset + l->data->request.data_size > offset)
1392         {
1393         //r_mesh_rcachesequentialchain_current = l;
1394         //R_Mesh_CacheArray_ValidateState(8);
1395                 lnext = l->next;
1396                 // if at the end of the chain, wrap around
1397                 if (lnext == lhead)
1398                         lnext = lnext->next;
1399         //r_mesh_rcachesequentialchain_current = lnext;
1400         //R_Mesh_CacheArray_ValidateState(10);
1401
1402                 // unlink from sequential chain
1403                 l->next->prev = l->prev;
1404                 l->prev->next = l->next;
1405         //R_Mesh_CacheArray_ValidateState(11);
1406                 // link into free chain
1407                 l->next = &r_mesh_rcachefreechain;
1408                 l->prev = l->next->prev;
1409                 l->next->prev = l->prev->next = l;
1410         //R_Mesh_CacheArray_ValidateState(12);
1411
1412                 l = &l->data->hashlink;
1413                 // unlink from hash chain
1414                 l->next->prev = l->prev;
1415                 l->prev->next = l->next;
1416
1417                 l = lnext;
1418         //r_mesh_rcachesequentialchain_current = l;
1419         //R_Mesh_CacheArray_ValidateState(9);
1420         }
1421         //r_mesh_rcachesequentialchain_current = l;
1422         //R_Mesh_CacheArray_ValidateState(5);
1423         // gobble an extra item if we have no free items available
1424         if (r_mesh_rcachefreechain.next == &r_mesh_rcachefreechain)
1425         {
1426                 lnext = l->next;
1427
1428                 // unlink from sequential chain
1429                 l->next->prev = l->prev;
1430                 l->prev->next = l->next;
1431                 // link into free chain
1432                 l->next = &r_mesh_rcachefreechain;
1433                 l->prev = l->next->prev;
1434                 l->next->prev = l->prev->next = l;
1435
1436                 l = &l->data->hashlink;
1437                 // unlink from hash chain
1438                 l->next->prev = l->prev;
1439                 l->prev->next = l->next;
1440
1441                 l = lnext;
1442         }
1443         r_mesh_rcachesequentialchain_current = l;
1444         //R_Mesh_CacheArray_ValidateState(6);
1445
1446         // now take an item from the free chain
1447         l = r_mesh_rcachefreechain.next;
1448         // set it up
1449         d = l->data;
1450         d->request = *r;
1451         d->offset = offset;
1452         // unlink
1453         l->next->prev = l->prev;
1454         l->prev->next = l->next;
1455         // relink to sequential
1456         l->next = r_mesh_rcachesequentialchain_current->prev;
1457         l->prev = l->next->prev;
1458         while (l->next->data && l->data && l->next->data->offset <= d->offset)
1459         {
1460                 //Con_Printf(">\n");
1461                 l->next = l->next->next;
1462                 l->prev = l->prev->next;
1463         }
1464         while (l->prev->data && l->data && l->prev->data->offset >= d->offset)
1465         {
1466                 //Con_Printf("<\n");
1467                 l->prev = l->prev->prev;
1468                 l->next = l->next->prev;
1469         }
1470         l->next->prev = l->prev->next = l;
1471         // also link into hash chain
1472         l = &l->data->hashlink;
1473         l->next = &r_mesh_rcachechain[hashindex];
1474         l->prev = l->next->prev;
1475         l->prev->next = l;
1476         l->next->prev = l->prev->next = l;
1477
1478
1479         //r_mesh_rcachesequentialchain_current = d->sequentiallink.next;
1480
1481         //R_Mesh_CacheArray_ValidateState(7);
1482         // and finally set the data pointer
1483         r->data = r_mesh_rcachedata + d->offset;
1484         // and tell the caller to fill the array
1485         return true;
1486 }
1487