gl_backend.c

   1
   2 #include "quakedef.h"
   3 #include "image.h"
   4 #include "jpeg.h"
   5
   6 cvar_t gl_mesh_drawrangeelements = {0, "gl_mesh_drawrangeelements", "1"};
   7 cvar_t gl_mesh_testarrayelement = {0, "gl_mesh_testarrayelement", "0"};
   8 cvar_t gl_mesh_testmanualfeeding = {0, "gl_mesh_testmanualfeeding", "0"};
   9 cvar_t gl_delayfinish = {CVAR_SAVE, "gl_delayfinish", "0"};
  10 cvar_t gl_paranoid = {0, "gl_paranoid", "0"};
  11 cvar_t gl_printcheckerror = {0, "gl_printcheckerror", "0"};
  12
  13 cvar_t r_render = {0, "r_render", "1"};
  14 cvar_t gl_dither = {CVAR_SAVE, "gl_dither", "1"}; // whether or not to use dithering
  15 cvar_t gl_lockarrays = {0, "gl_lockarrays", "1"};
  16
  17 int gl_maxdrawrangeelementsvertices;
  18 int gl_maxdrawrangeelementsindices;
  19
  20 #ifdef DEBUGGL
  21 int errornumber = 0;
  22
  23 void GL_PrintError(int errornumber, char *filename, int linenumber)
  24 {
  25         switch(errornumber)
  26         {
  27 #ifdef GL_INVALID_ENUM
  28         case GL_INVALID_ENUM:
  29                 Con_Printf("GL_INVALID_ENUM at %s:%i\n", filename, linenumber);
  30                 break;
  31 #endif
  32 #ifdef GL_INVALID_VALUE
  33         case GL_INVALID_VALUE:
  34                 Con_Printf("GL_INVALID_VALUE at %s:%i\n", filename, linenumber);
  35                 break;
  36 #endif
  37 #ifdef GL_INVALID_OPERATION
  38         case GL_INVALID_OPERATION:
  39                 Con_Printf("GL_INVALID_OPERATION at %s:%i\n", filename, linenumber);
  40                 break;
  41 #endif
  42 #ifdef GL_STACK_OVERFLOW
  43         case GL_STACK_OVERFLOW:
  44                 Con_Printf("GL_STACK_OVERFLOW at %s:%i\n", filename, linenumber);
  45                 break;
  46 #endif
  47 #ifdef GL_STACK_UNDERFLOW
  48         case GL_STACK_UNDERFLOW:
  49                 Con_Printf("GL_STACK_UNDERFLOW at %s:%i\n", filename, linenumber);
  50                 break;
  51 #endif
  52 #ifdef GL_OUT_OF_MEMORY
  53         case GL_OUT_OF_MEMORY:
  54                 Con_Printf("GL_OUT_OF_MEMORY at %s:%i\n", filename, linenumber);
  55                 break;
  56 #endif
  57 #ifdef GL_TABLE_TOO_LARGE
  58         case GL_TABLE_TOO_LARGE:
  59                 Con_Printf("GL_TABLE_TOO_LARGE at %s:%i\n", filename, linenumber);
  60                 break;
  61 #endif
  62         default:
  63                 Con_Printf("GL UNKNOWN (%i) at %s:%i\n", errornumber, filename, linenumber);
  64                 break;
  65         }
  66 }
  67 #endif
  68
  69 #define BACKENDACTIVECHECK if (!backendactive) Sys_Error("GL backend function called when backend is not active\n");
  70
  71 int c_meshs, c_meshelements;
  72
  73 void SCR_ScreenShot_f (void);
  74
  75 // these are externally accessible
  76 int r_lightmapscalebit;
  77
  78 static matrix4x4_t backend_viewmatrix;
  79 static matrix4x4_t backend_modelmatrix;
  80 static matrix4x4_t backend_modelviewmatrix;
  81 static matrix4x4_t backend_glmodelviewmatrix;
  82 static matrix4x4_t backend_projectmatrix;
  83
  84 static int backendunits, backendactive;
  85 static mempool_t *gl_backend_mempool;
  86
  87 /*
  88 note: here's strip order for a terrain row:
  89 0--1--2--3--4
  90 |\ |\ |\ |\ |
  91 | \| \| \| \|
  92 A--B--C--D--E
  93 clockwise
  94
  95 A0B, 01B, B1C, 12C, C2D, 23D, D3E, 34E
  96
  97 *elements++ = i + row;
  98 *elements++ = i;
  99 *elements++ = i + row + 1;
 100 *elements++ = i;
 101 *elements++ = i + 1;
 102 *elements++ = i + row + 1;
 103
 104
 105 for (y = 0;y < rows - 1;y++)
 106 {
 107         for (x = 0;x < columns - 1;x++)
 108         {
 109                 i = y * rows + x;
 110                 *elements++ = i + columns;
 111                 *elements++ = i;
 112                 *elements++ = i + columns + 1;
 113                 *elements++ = i;
 114                 *elements++ = i + 1;
 115                 *elements++ = i + columns + 1;
 116         }
 117 }
 118
 119 alternative:
 120 0--1--2--3--4
 121 | /| /|\ | /|
 122 |/ |/ | \|/ |
 123 A--B--C--D--E
 124 counterclockwise
 125
 126 for (y = 0;y < rows - 1;y++)
 127 {
 128         for (x = 0;x < columns - 1;x++)
 129         {
 130                 i = y * rows + x;
 131                 *elements++ = i;
 132                 *elements++ = i + columns;
 133                 *elements++ = i + columns + 1;
 134                 *elements++ = i + columns;
 135                 *elements++ = i + columns + 1;
 136                 *elements++ = i + 1;
 137         }
 138 }
 139 */
 140
 141 int polygonelements[768];
 142
 143 static void R_Mesh_CacheArray_Startup(void);
 144 static void R_Mesh_CacheArray_Shutdown(void);
 145 void GL_Backend_AllocArrays(void)
 146 {
 147         if (!gl_backend_mempool)
 148                 gl_backend_mempool = Mem_AllocPool("GL_Backend");
 149         R_Mesh_CacheArray_Startup();
 150 }
 151
 152 void GL_Backend_FreeArrays(void)
 153 {
 154         R_Mesh_CacheArray_Shutdown();
 155         Mem_FreePool(&gl_backend_mempool);
 156 }
 157
 158 static void gl_backend_start(void)
 159 {
 160         Con_DPrintf("OpenGL Backend started\n");
 161         if (qglDrawRangeElements != NULL)
 162         {
 163                 CHECKGLERROR
 164                 qglGetIntegerv(GL_MAX_ELEMENTS_VERTICES, &gl_maxdrawrangeelementsvertices);
 165                 CHECKGLERROR
 166                 qglGetIntegerv(GL_MAX_ELEMENTS_INDICES, &gl_maxdrawrangeelementsindices);
 167                 CHECKGLERROR
 168                 Con_DPrintf("glDrawRangeElements detected (max vertices %i, max indices %i)\n", gl_maxdrawrangeelementsvertices, gl_maxdrawrangeelementsindices);
 169         }
 170
 171         backendunits = min(MAX_TEXTUREUNITS, gl_textureunits);
 172
 173         GL_Backend_AllocArrays();
 174
 175         backendactive = true;
 176 }
 177
 178 static void gl_backend_shutdown(void)
 179 {
 180         backendunits = 0;
 181         backendactive = false;
 182
 183         Con_DPrintf("OpenGL Backend shutting down\n");
 184
 185         GL_Backend_FreeArrays();
 186 }
 187
 188 static void gl_backend_newmap(void)
 189 {
 190 }
 191
 192 void gl_backend_init(void)
 193 {
 194         int i;
 195
 196         for (i = 0;i < POLYGONELEMENTS_MAXPOINTS - 2;i++)
 197         {
 198                 polygonelements[i * 3 + 0] = 0;
 199                 polygonelements[i * 3 + 1] = i + 1;
 200                 polygonelements[i * 3 + 2] = i + 2;
 201         }
 202
 203         Cvar_RegisterVariable(&r_render);
 204         Cvar_RegisterVariable(&gl_dither);
 205         Cvar_RegisterVariable(&gl_lockarrays);
 206         Cvar_RegisterVariable(&gl_delayfinish);
 207         Cvar_RegisterVariable(&gl_paranoid);
 208         Cvar_RegisterVariable(&gl_printcheckerror);
 209 #ifdef NORENDER
 210         Cvar_SetValue("r_render", 0);
 211 #endif
 212
 213         Cvar_RegisterVariable(&gl_mesh_drawrangeelements);
 214         Cvar_RegisterVariable(&gl_mesh_testarrayelement);
 215         Cvar_RegisterVariable(&gl_mesh_testmanualfeeding);
 216         R_RegisterModule("GL_Backend", gl_backend_start, gl_backend_shutdown, gl_backend_newmap);
 217 }
 218
 219 void GL_SetupView_ViewPort (int x, int y, int width, int height)
 220 {
 221         if (!r_render.integer)
 222                 return;
 223
 224         // y is weird beause OpenGL is bottom to top, we use top to bottom
 225         qglViewport(x, vid.realheight - (y + height), width, height);
 226         CHECKGLERROR
 227 }
 228
 229 void GL_SetupView_Orientation_Identity (void)
 230 {
 231         Matrix4x4_CreateIdentity(&backend_viewmatrix);
 232         memset(&backend_modelmatrix, 0, sizeof(backend_modelmatrix));
 233 }
 234
 235 void GL_SetupView_Orientation_FromEntity (vec3_t origin, vec3_t angles)
 236 {
 237         Matrix4x4_CreateRotate(&backend_viewmatrix, -90, 1, 0, 0);
 238         Matrix4x4_ConcatRotate(&backend_viewmatrix, 90, 0, 0, 1);
 239         Matrix4x4_ConcatRotate(&backend_viewmatrix, -angles[2], 1, 0, 0);
 240         Matrix4x4_ConcatRotate(&backend_viewmatrix, -angles[0], 0, 1, 0);
 241         Matrix4x4_ConcatRotate(&backend_viewmatrix, -angles[1], 0, 0, 1);
 242         Matrix4x4_ConcatTranslate(&backend_viewmatrix, -origin[0], -origin[1], -origin[2]);
 243         memset(&backend_modelmatrix, 0, sizeof(backend_modelmatrix));
 244 }
 245
 246 void GL_SetupView_Mode_Perspective (double fovx, double fovy, double zNear, double zFar)
 247 {
 248         double xmax, ymax;
 249
 250         if (!r_render.integer)
 251                 return;
 252
 253         // set up viewpoint
 254         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 255         qglLoadIdentity();CHECKGLERROR
 256         // pyramid slopes
 257         xmax = zNear * tan(fovx * M_PI / 360.0);
 258         ymax = zNear * tan(fovy * M_PI / 360.0);
 259         // set view pyramid
 260         qglFrustum(-xmax, xmax, -ymax, ymax, zNear, zFar);CHECKGLERROR
 261         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 262         GL_SetupView_Orientation_Identity();
 263 }
 264
 265 void GL_SetupView_Mode_PerspectiveInfiniteFarClip (double fovx, double fovy, double zNear)
 266 {
 267         float nudge, m[16];
 268
 269         if (!r_render.integer)
 270                 return;
 271
 272         // set up viewpoint
 273         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 274         qglLoadIdentity();CHECKGLERROR
 275         // set view pyramid
 276         nudge = 1.0 - 1.0 / (1<<23);
 277         m[ 0] = 1.0 / tan(fovx * M_PI / 360.0);
 278         m[ 1] = 0;
 279         m[ 2] = 0;
 280         m[ 3] = 0;
 281         m[ 4] = 0;
 282         m[ 5] = 1.0 / tan(fovy * M_PI / 360.0);
 283         m[ 6] = 0;
 284         m[ 7] = 0;
 285         m[ 8] = 0;
 286         m[ 9] = 0;
 287         m[10] = -1 * nudge;
 288         m[11] = -1 * nudge;
 289         m[12] = 0;
 290         m[13] = 0;
 291         m[14] = -2 * zNear * nudge;
 292         m[15] = 0;
 293         qglLoadMatrixf(m);
 294         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 295         GL_SetupView_Orientation_Identity();
 296         backend_projectmatrix.m[0][0] = m[0];
 297         backend_projectmatrix.m[1][0] = m[1];
 298         backend_projectmatrix.m[2][0] = m[2];
 299         backend_projectmatrix.m[3][0] = m[3];
 300         backend_projectmatrix.m[0][1] = m[4];
 301         backend_projectmatrix.m[1][1] = m[5];
 302         backend_projectmatrix.m[2][1] = m[6];
 303         backend_projectmatrix.m[3][1] = m[7];
 304         backend_projectmatrix.m[0][2] = m[8];
 305         backend_projectmatrix.m[1][2] = m[9];
 306         backend_projectmatrix.m[2][2] = m[10];
 307         backend_projectmatrix.m[3][2] = m[11];
 308         backend_projectmatrix.m[0][3] = m[12];
 309         backend_projectmatrix.m[1][3] = m[13];
 310         backend_projectmatrix.m[2][3] = m[14];
 311         backend_projectmatrix.m[3][3] = m[15];
 312 }
 313
 314 void GL_SetupView_Mode_Ortho (double x1, double y1, double x2, double y2, double zNear, double zFar)
 315 {
 316         if (!r_render.integer)
 317                 return;
 318
 319         // set up viewpoint
 320         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 321         qglLoadIdentity();CHECKGLERROR
 322         qglOrtho(x1, x2, y2, y1, zNear, zFar);
 323         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 324         GL_SetupView_Orientation_Identity();
 325 }
 326
 327 typedef struct gltextureunit_s
 328 {
 329         int t1d, t2d, t3d, tcubemap;
 330         int arrayenabled;
 331         int arrayis3d;
 332         const void *pointer_texcoord;
 333         float rgbscale, alphascale;
 334         int combinergb, combinealpha;
 335         // FIXME: add more combine stuff
 336         matrix4x4_t matrix;
 337 }
 338 gltextureunit_t;
 339
 340 static struct
 341 {
 342         int blendfunc1;
 343         int blendfunc2;
 344         int blend;
 345         GLboolean depthmask;
 346         int depthtest;
 347         int unit;
 348         int clientunit;
 349         gltextureunit_t units[MAX_TEXTUREUNITS];
 350         float color4f[4];
 351         int lockrange_first;
 352         int lockrange_count;
 353         const void *pointer_vertex;
 354         const void *pointer_color;
 355 }
 356 gl_state;
 357
 358 void GL_SetupTextureState(void)
 359 {
 360         int i;
 361         gltextureunit_t *unit;
 362         gl_state.unit = -1;
 363         gl_state.clientunit = -1;
 364         for (i = 0;i < backendunits;i++)
 365         {
 366                 GL_ActiveTexture(i);
 367                 GL_ClientActiveTexture(i);
 368                 unit = gl_state.units + i;
 369                 unit->t1d = 0;
 370                 unit->t2d = 0;
 371                 unit->t3d = 0;
 372                 unit->tcubemap = 0;
 373                 unit->pointer_texcoord = NULL;
 374                 unit->rgbscale = 1;
 375                 unit->alphascale = 1;
 376                 unit->combinergb = GL_MODULATE;
 377                 unit->combinealpha = GL_MODULATE;
 378
 379                 qglTexCoordPointer(2, GL_FLOAT, sizeof(float[2]), NULL);CHECKGLERROR
 380                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 381
 382                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 383                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 384                 if (gl_texture3d)
 385                 {
 386                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 387                 }
 388                 if (gl_texturecubemap)
 389                 {
 390                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 391                 }
 392                 if (gl_combine.integer)
 393                 {
 394                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);CHECKGLERROR
 395                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_MODULATE);CHECKGLERROR
 396                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE);CHECKGLERROR
 397                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 398                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_RGB_ARB, GL_TEXTURE);CHECKGLERROR // for GL_INTERPOLATE_ARB mode
 399                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 400                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 401                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_RGB_ARB, GL_SRC_ALPHA);CHECKGLERROR
 402                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, GL_MODULATE);CHECKGLERROR
 403                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA_ARB, GL_TEXTURE);CHECKGLERROR
 404                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_ALPHA_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 405                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_ALPHA_ARB, GL_CONSTANT_ARB);CHECKGLERROR
 406                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 407                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 408                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 409                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
 410                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
 411                 }
 412                 else
 413                 {
 414                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 415                 }
 416         }
 417 }
 418
 419 void GL_Backend_ResetState(void)
 420 {
 421         memset(&gl_state, 0, sizeof(gl_state));
 422         gl_state.depthtest = true;
 423         gl_state.blendfunc1 = GL_ONE;
 424         gl_state.blendfunc2 = GL_ZERO;
 425         gl_state.blend = false;
 426         gl_state.depthmask = GL_TRUE;
 427         gl_state.color4f[0] = gl_state.color4f[1] = gl_state.color4f[2] = gl_state.color4f[3] = 1;
 428         gl_state.lockrange_first = 0;
 429         gl_state.lockrange_count = 0;
 430         gl_state.pointer_vertex = NULL;
 431         gl_state.pointer_color = NULL;
 432
 433         CHECKGLERROR
 434
 435         qglEnable(GL_CULL_FACE);CHECKGLERROR
 436         qglCullFace(GL_FRONT);CHECKGLERROR
 437         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 438         qglBlendFunc(gl_state.blendfunc1, gl_state.blendfunc2);CHECKGLERROR
 439         qglDisable(GL_BLEND);CHECKGLERROR
 440         qglDepthMask(gl_state.depthmask);CHECKGLERROR
 441
 442         qglVertexPointer(3, GL_FLOAT, sizeof(float[3]), NULL);CHECKGLERROR
 443         qglEnableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 444
 445         qglColorPointer(4, GL_FLOAT, sizeof(float[4]), NULL);CHECKGLERROR
 446         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 447
 448         GL_Color(0, 0, 0, 0);
 449         GL_Color(1, 1, 1, 1);
 450
 451         GL_SetupTextureState();
 452 }
 453
 454 void GL_ActiveTexture(int num)
 455 {
 456         if (gl_state.unit != num)
 457         {
 458                 gl_state.unit = num;
 459                 if (qglActiveTexture)
 460                 {
 461                         qglActiveTexture(GL_TEXTURE0_ARB + gl_state.unit);
 462                         CHECKGLERROR
 463                 }
 464         }
 465 }
 466
 467 void GL_ClientActiveTexture(int num)
 468 {
 469         if (gl_state.clientunit != num)
 470         {
 471                 gl_state.clientunit = num;
 472                 if (qglActiveTexture)
 473                 {
 474                         qglClientActiveTexture(GL_TEXTURE0_ARB + gl_state.clientunit);
 475                         CHECKGLERROR
 476                 }
 477         }
 478 }
 479
 480 void GL_BlendFunc(int blendfunc1, int blendfunc2)
 481 {
 482         if (gl_state.blendfunc1 != blendfunc1 || gl_state.blendfunc2 != blendfunc2)
 483         {
 484                 qglBlendFunc(gl_state.blendfunc1 = blendfunc1, gl_state.blendfunc2 = blendfunc2);CHECKGLERROR
 485                 if (gl_state.blendfunc2 == GL_ZERO)
 486                 {
 487                         if (gl_state.blendfunc1 == GL_ONE)
 488                         {
 489                                 if (gl_state.blend)
 490                                 {
 491                                         gl_state.blend = 0;
 492                                         qglDisable(GL_BLEND);CHECKGLERROR
 493                                 }
 494                         }
 495                         else
 496                         {
 497                                 if (!gl_state.blend)
 498                                 {
 499                                         gl_state.blend = 1;
 500                                         qglEnable(GL_BLEND);CHECKGLERROR
 501                                 }
 502                         }
 503                 }
 504                 else
 505                 {
 506                         if (!gl_state.blend)
 507                         {
 508                                 gl_state.blend = 1;
 509                                 qglEnable(GL_BLEND);CHECKGLERROR
 510                         }
 511                 }
 512         }
 513 }
 514
 515 void GL_DepthMask(int state)
 516 {
 517         if (gl_state.depthmask != state)
 518         {
 519                 qglDepthMask(gl_state.depthmask = state);CHECKGLERROR
 520         }
 521 }
 522
 523 void GL_DepthTest(int state)
 524 {
 525         if (gl_state.depthtest != state)
 526         {
 527                 gl_state.depthtest = state;
 528                 if (gl_state.depthtest)
 529                 {
 530                         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 531                 }
 532                 else
 533                 {
 534                         qglDisable(GL_DEPTH_TEST);CHECKGLERROR
 535                 }
 536         }
 537 }
 538
 539 void GL_VertexPointer(const float *p)
 540 {
 541         if (gl_state.pointer_vertex != p)
 542         {
 543                 gl_state.pointer_vertex = p;
 544                 CHECKGLERROR
 545                 qglVertexPointer(3, GL_FLOAT, sizeof(float[3]), gl_state.pointer_vertex);
 546                 CHECKGLERROR
 547         }
 548 }
 549
 550 void GL_ColorPointer(const float *p)
 551 {
 552         if (gl_state.pointer_color != p)
 553         {
 554                 CHECKGLERROR
 555                 if (!gl_state.pointer_color)
 556                 {
 557                         qglEnableClientState(GL_COLOR_ARRAY);
 558                         CHECKGLERROR
 559                 }
 560                 else if (!p)
 561                 {
 562                         qglDisableClientState(GL_COLOR_ARRAY);
 563                         CHECKGLERROR
 564                 }
 565                 gl_state.pointer_color = p;
 566                 qglColorPointer(4, GL_FLOAT, sizeof(float[4]), gl_state.pointer_color);
 567                 CHECKGLERROR
 568         }
 569 }
 570
 571 void GL_Color(float cr, float cg, float cb, float ca)
 572 {
 573         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)
 574         {
 575                 GL_ColorPointer(NULL);
 576                 gl_state.color4f[0] = cr;
 577                 gl_state.color4f[1] = cg;
 578                 gl_state.color4f[2] = cb;
 579                 gl_state.color4f[3] = ca;
 580                 CHECKGLERROR
 581                 qglColor4f(cr, cg, cb, ca);
 582                 CHECKGLERROR
 583         }
 584 }
 585
 586 void GL_LockArrays(int first, int count)
 587 {
 588         if (gl_state.lockrange_count != count || gl_state.lockrange_first != first)
 589         {
 590                 if (gl_state.lockrange_count)
 591                 {
 592                         gl_state.lockrange_count = 0;
 593                         CHECKGLERROR
 594                         qglUnlockArraysEXT();
 595                         CHECKGLERROR
 596                 }
 597                 if (count && gl_supportslockarrays && gl_lockarrays.integer)
 598                 {
 599                         gl_state.lockrange_first = first;
 600                         gl_state.lockrange_count = count;
 601                         CHECKGLERROR
 602                         qglLockArraysEXT(first, count);
 603                         CHECKGLERROR
 604                 }
 605         }
 606 }
 607
 608 void GL_TransformToScreen(const vec4_t in, vec4_t out)
 609 {
 610         vec4_t temp;
 611         float iw;
 612         Matrix4x4_Transform4 (&backend_viewmatrix, in, temp);
 613         Matrix4x4_Transform4 (&backend_projectmatrix, temp, out);
 614         iw = 1.0f / out[3];
 615         out[0] = r_refdef.x + (out[0] * iw + 1.0f) * r_refdef.width * 0.5f;
 616         out[1] = r_refdef.y + (out[1] * iw + 1.0f) * r_refdef.height * 0.5f;
 617         out[2] = out[2] * iw;
 618 }
 619
 620 // called at beginning of frame
 621 void R_Mesh_Start(void)
 622 {
 623         BACKENDACTIVECHECK
 624         CHECKGLERROR
 625         GL_Backend_ResetState();
 626 }
 627
 628 int gl_backend_rebindtextures;
 629
 630 void GL_Backend_RenumberElements(int *out, int count, const int *in, int offset)
 631 {
 632         int i;
 633         if (offset)
 634         {
 635                 for (i = 0;i < count;i++)
 636                         *out++ = *in++ + offset;
 637         }
 638         else
 639                 memcpy(out, in, sizeof(*out) * count);
 640 }
 641
 642 // renders triangles using vertices from the active arrays
 643 int paranoidblah = 0;
 644 void R_Mesh_Draw(int numverts, int numtriangles, const int *elements)
 645 {
 646         int numelements = numtriangles * 3;
 647         if (numverts == 0 || numtriangles == 0)
 648         {
 649                 Con_Printf("R_Mesh_Draw(%d, %d, %08p);\n", numverts, numtriangles, elements);
 650                 return;
 651         }
 652         c_meshs++;
 653         c_meshelements += numelements;
 654         CHECKGLERROR
 655         if (r_render.integer)
 656         {
 657                 if (gl_paranoid.integer)
 658                 {
 659                         int i, j, size;
 660                         const int *p;
 661                         if (!qglIsEnabled(GL_VERTEX_ARRAY))
 662                                 Con_Printf("R_Mesh_Draw: vertex array not enabled\n");
 663                         for (j = 0, size = numverts * (int)sizeof(float[3]), p = gl_state.pointer_vertex;j < size;j += sizeof(int), p++)
 664                                 paranoidblah += *p;
 665                         if (gl_state.pointer_color)
 666                         {
 667                                 if (!qglIsEnabled(GL_COLOR_ARRAY))
 668                                         Con_Printf("R_Mesh_Draw: color array set but not enabled\n");
 669                                 for (j = 0, size = numverts * (int)sizeof(float[4]), p = gl_state.pointer_color;j < size;j += sizeof(int), p++)
 670                                         paranoidblah += *p;
 671                         }
 672                         for (i = 0;i < backendunits;i++)
 673                         {
 674                                 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)
 675                                 {
 676                                         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))
 677                                                 Con_Printf("R_Mesh_Draw: array enabled but no texture bound\n");
 678                                         GL_ActiveTexture(i);
 679                                         if (!qglIsEnabled(GL_TEXTURE_COORD_ARRAY))
 680                                                 Con_Printf("R_Mesh_Draw: texcoord array set but not enabled\n");
 681                                         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++)
 682                                                 paranoidblah += *p;
 683                                 }
 684                         }
 685                         for (i = 0;i < numtriangles * 3;i++)
 686                         {
 687                                 if (elements[i] < 0 || elements[i] >= numverts)
 688                                 {
 689                                         Con_Printf("R_Mesh_Draw: invalid vertex index %i (outside range 0 - %i) in elements list\n", elements[i], numverts);
 690                                         return;
 691                                 }
 692                         }
 693                 }
 694                 CHECKGLERROR
 695                 GL_LockArrays(0, numverts);
 696                 CHECKGLERROR
 697                 if (gl_mesh_testmanualfeeding.integer)
 698                 {
 699                         int i, j;
 700                         const GLfloat *p;
 701                         qglBegin(GL_TRIANGLES);
 702                         for (i = 0;i < numtriangles * 3;i++)
 703                         {
 704                                 for (j = 0;j < backendunits;j++)
 705                                 {
 706                                         if (gl_state.units[j].pointer_texcoord)
 707                                         {
 708                                                 if (backendunits > 1)
 709                                                 {
 710                                                         if (gl_state.units[j].t3d || gl_state.units[j].tcubemap)
 711                                                         {
 712                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 3;
 713                                                                 qglMultiTexCoord3f(GL_TEXTURE0_ARB + j, p[0], p[1], p[2]);
 714                                                         }
 715                                                         else
 716                                                         {
 717                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 2;
 718                                                                 qglMultiTexCoord2f(GL_TEXTURE0_ARB + j, p[0], p[1]);
 719                                                         }
 720                                                 }
 721                                                 else
 722                                                 {
 723                                                         if (gl_state.units[j].t3d || gl_state.units[j].tcubemap)
 724                                                         {
 725                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 3;
 726                                                                 qglTexCoord3f(p[0], p[1], p[2]);
 727                                                         }
 728                                                         else
 729                                                         {
 730                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 2;
 731                                                                 qglTexCoord2f(p[0], p[1]);
 732                                                         }
 733                                                 }
 734                                         }
 735                                 }
 736                                 if (gl_state.pointer_color)
 737                                 {
 738                                         p = ((const GLfloat *)(gl_state.pointer_color)) + elements[i] * 4;
 739                                         qglColor4f(p[0], p[1], p[2], p[3]);
 740                                 }
 741                                 p = ((const GLfloat *)(gl_state.pointer_vertex)) + elements[i] * 3;
 742                                 qglVertex3f(p[0], p[1], p[2]);
 743                         }
 744                         qglEnd();
 745                         CHECKGLERROR
 746                 }
 747                 else if (gl_mesh_testarrayelement.integer)
 748                 {
 749                         int i;
 750                         qglBegin(GL_TRIANGLES);
 751                         for (i = 0;i < numtriangles * 3;i++)
 752                         {
 753                                 qglArrayElement(elements[i]);
 754                         }
 755                         qglEnd();
 756                         CHECKGLERROR
 757                 }
 758                 else if (gl_mesh_drawrangeelements.integer && qglDrawRangeElements != NULL)
 759                 {
 760                         qglDrawRangeElements(GL_TRIANGLES, 0, numverts, numelements, GL_UNSIGNED_INT, elements);CHECKGLERROR
 761                 }
 762                 else
 763                 {
 764                         qglDrawElements(GL_TRIANGLES, numelements, GL_UNSIGNED_INT, elements);CHECKGLERROR
 765                 }
 766                 CHECKGLERROR
 767                 GL_LockArrays(0, 0);
 768                 CHECKGLERROR
 769         }
 770 }
 771
 772 // restores backend state, used when done with 3D rendering
 773 void R_Mesh_Finish(void)
 774 {
 775         int i;
 776         BACKENDACTIVECHECK
 777                 CHECKGLERROR
 778         GL_LockArrays(0, 0);
 779                 CHECKGLERROR
 780
 781         for (i = backendunits - 1;i >= 0;i--)
 782         {
 783                 if (qglActiveTexture)
 784                         qglActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
 785                 if (qglClientActiveTexture)
 786                         qglClientActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
 787                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 788                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 789                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 790                 if (gl_texture3d)
 791                 {
 792                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 793                 }
 794                 if (gl_texturecubemap)
 795                 {
 796                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 797                 }
 798                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 799                 if (gl_combine.integer)
 800                 {
 801                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
 802                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
 803                 }
 804         }
 805         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 806         qglDisableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 807
 808         qglDisable(GL_BLEND);CHECKGLERROR
 809         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 810         qglDepthMask(GL_TRUE);CHECKGLERROR
 811         qglBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);CHECKGLERROR
 812 }
 813
 814 void R_Mesh_Matrix(const matrix4x4_t *matrix)
 815 {
 816         if (memcmp(matrix, &backend_modelmatrix, sizeof(matrix4x4_t)))
 817         {
 818                 backend_modelmatrix = *matrix;
 819                 Matrix4x4_Concat(&backend_modelviewmatrix, &backend_viewmatrix, matrix);
 820                 Matrix4x4_Transpose(&backend_glmodelviewmatrix, &backend_modelviewmatrix);
 821                 qglLoadMatrixf(&backend_glmodelviewmatrix.m[0][0]);
 822         }
 823 }
 824
 825 void R_Mesh_TextureMatrix(int unitnumber, const matrix4x4_t *matrix)
 826 {
 827         if (memcmp(&gl_state.units[unitnumber].matrix, matrix, sizeof(matrix4x4_t)))
 828         {
 829                 matrix4x4_t tempmatrix;
 830                 gl_state.units[unitnumber].matrix = *matrix;
 831                 Matrix4x4_Transpose(&tempmatrix, &gl_state.units[unitnumber].matrix);
 832                 qglMatrixMode(GL_TEXTURE);
 833                 GL_ActiveTexture(unitnumber);
 834                 qglLoadMatrixf(&tempmatrix.m[0][0]);
 835                 qglMatrixMode(GL_MODELVIEW);
 836         }
 837 }
 838
 839 void R_Mesh_State_Texture(const rmeshstate_t *m)
 840 {
 841         int i, combinergb, combinealpha, scale, arrayis3d;
 842         gltextureunit_t *unit;
 843
 844         BACKENDACTIVECHECK
 845
 846         if (gl_backend_rebindtextures)
 847         {
 848                 gl_backend_rebindtextures = false;
 849                 GL_SetupTextureState();
 850         }
 851
 852         for (i = 0, unit = gl_state.units;i < backendunits;i++, unit++)
 853         {
 854                 if (unit->t1d != m->tex1d[i])
 855                 {
 856                         GL_ActiveTexture(i);
 857                         if (m->tex1d[i])
 858                         {
 859                                 if (unit->t1d == 0)
 860                                         qglEnable(GL_TEXTURE_1D);CHECKGLERROR
 861                         }
 862                         else
 863                         {
 864                                 if (unit->t1d)
 865                                         qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 866                         }
 867                         qglBindTexture(GL_TEXTURE_1D, (unit->t1d = m->tex1d[i]));CHECKGLERROR
 868                 }
 869                 if (unit->t2d != m->tex[i])
 870                 {
 871                         GL_ActiveTexture(i);
 872                         if (m->tex[i])
 873                         {
 874                                 if (unit->t2d == 0)
 875                                         qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 876                         }
 877                         else
 878                         {
 879                                 if (unit->t2d)
 880                                         qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 881                         }
 882                         qglBindTexture(GL_TEXTURE_2D, (unit->t2d = m->tex[i]));CHECKGLERROR
 883                 }
 884                 if (unit->t3d != m->tex3d[i])
 885                 {
 886                         GL_ActiveTexture(i);
 887                         if (m->tex3d[i])
 888                         {
 889                                 if (unit->t3d == 0)
 890                                         qglEnable(GL_TEXTURE_3D);CHECKGLERROR
 891                         }
 892                         else
 893                         {
 894                                 if (unit->t3d)
 895                                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 896                         }
 897                         qglBindTexture(GL_TEXTURE_3D, (unit->t3d = m->tex3d[i]));CHECKGLERROR
 898                 }
 899                 if (unit->tcubemap != m->texcubemap[i])
 900                 {
 901                         GL_ActiveTexture(i);
 902                         if (m->texcubemap[i])
 903                         {
 904                                 if (unit->tcubemap == 0)
 905                                         qglEnable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 906                         }
 907                         else
 908                         {
 909                                 if (unit->tcubemap)
 910                                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 911                         }
 912                         qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, (unit->tcubemap = m->texcubemap[i]));CHECKGLERROR
 913                 }
 914                 combinergb = m->texcombinergb[i];
 915                 if (!combinergb)
 916                         combinergb = GL_MODULATE;
 917                 if (unit->combinergb != combinergb)
 918                 {
 919                         GL_ActiveTexture(i);
 920                         unit->combinergb = combinergb;
 921                         if (gl_combine.integer)
 922                         {
 923                                 qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, unit->combinergb);CHECKGLERROR
 924                         }
 925                         else
 926                         {
 927                                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, unit->combinergb);CHECKGLERROR
 928                         }
 929                 }
 930                 combinealpha = m->texcombinealpha[i];
 931                 if (!combinealpha)
 932                         combinealpha = GL_MODULATE;
 933                 if (unit->combinealpha != combinealpha)
 934                 {
 935                         GL_ActiveTexture(i);
 936                         unit->combinealpha = combinealpha;
 937                         if (gl_combine.integer)
 938                         {
 939                                 qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, unit->combinealpha);CHECKGLERROR
 940                         }
 941                 }
 942                 scale = max(m->texrgbscale[i], 1);
 943                 if (unit->rgbscale != scale)
 944                 {
 945                         GL_ActiveTexture(i);
 946                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, (unit->rgbscale = scale));CHECKGLERROR
 947                 }
 948                 scale = max(m->texalphascale[i], 1);
 949                 if (unit->alphascale != scale)
 950                 {
 951                         GL_ActiveTexture(i);
 952                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, (unit->alphascale = scale));CHECKGLERROR
 953                 }
 954                 arrayis3d = unit->t3d || unit->tcubemap;
 955                 if (unit->pointer_texcoord != m->pointer_texcoord[i] || unit->arrayis3d != arrayis3d)
 956                 {
 957                         GL_ClientActiveTexture(i);
 958                         if (m->pointer_texcoord[i])
 959                         {
 960                                 if (!unit->arrayenabled)
 961                                 {
 962                                         unit->arrayenabled = true;
 963                                         qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 964                                 }
 965                         }
 966                         else
 967                         {
 968                                 if (unit->arrayenabled)
 969                                 {
 970                                         unit->arrayenabled = false;
 971                                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 972                                 }
 973                         }
 974                         unit->pointer_texcoord = m->pointer_texcoord[i];
 975                         unit->arrayis3d = arrayis3d;
 976                         if (unit->arrayis3d)
 977                                 qglTexCoordPointer(3, GL_FLOAT, sizeof(float[3]), unit->pointer_texcoord);
 978                         else
 979                                 qglTexCoordPointer(2, GL_FLOAT, sizeof(float[2]), unit->pointer_texcoord);
 980                         CHECKGLERROR
 981                 }
 982         }
 983 }
 984
 985 /*
 986 ==============================================================================
 987
 988                                                 SCREEN SHOTS
 989
 990 ==============================================================================
 991 */
 992
 993 qboolean SCR_ScreenShot(char *filename, int x, int y, int width, int height, qboolean jpeg)
 994 {
 995         qboolean ret;
 996         qbyte *buffer;
 997
 998         if (!r_render.integer)
 999                 return false;
1000
1001         buffer = Mem_Alloc(tempmempool, width*height*3);
1002         qglReadPixels (x, y, width, height, GL_RGB, GL_UNSIGNED_BYTE, buffer);
1003         CHECKGLERROR
1004
1005         if (jpeg)
1006                 ret = JPEG_SaveImage_preflipped (filename, width, height, buffer);
1007         else
1008                 ret = Image_WriteTGARGB_preflipped (filename, width, height, buffer);
1009
1010         Mem_Free(buffer);
1011         return ret;
1012 }
1013
1014 //=============================================================================
1015
1016 void R_ClearScreen(void)
1017 {
1018         if (r_render.integer)
1019         {
1020                 // clear to black
1021                 qglClearColor(0,0,0,0);CHECKGLERROR
1022                 qglClearDepth(1);CHECKGLERROR
1023                 if (gl_stencil)
1024                 {
1025                         // LordHavoc: we use a stencil centered around 128 instead of 0,
1026                         // to avoid clamping interfering with strange shadow volume
1027                         // drawing orders
1028                         qglClearStencil(128);CHECKGLERROR
1029                 }
1030                 // clear the screen
1031                 qglClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | (gl_stencil ? GL_STENCIL_BUFFER_BIT : 0));CHECKGLERROR
1032                 // set dithering mode
1033                 if (gl_dither.integer)
1034                 {
1035                         qglEnable(GL_DITHER);CHECKGLERROR
1036                 }
1037                 else
1038                 {
1039                         qglDisable(GL_DITHER);CHECKGLERROR
1040                 }
1041         }
1042 }
1043
1044 /*
1045 ==================
1046 SCR_UpdateScreen
1047
1048 This is called every frame, and can also be called explicitly to flush
1049 text to the screen.
1050 ==================
1051 */
1052 void SCR_UpdateScreen (void)
1053 {
1054         if (gl_delayfinish.integer)
1055         {
1056                 VID_Finish ();
1057
1058                 R_TimeReport("finish");
1059         }
1060
1061         if (r_textureunits.integer > gl_textureunits)
1062                 Cvar_SetValueQuick(&r_textureunits, gl_textureunits);
1063         if (r_textureunits.integer < 1)
1064                 Cvar_SetValueQuick(&r_textureunits, 1);
1065
1066         if (gl_combine.integer && (!gl_combine_extension || r_textureunits.integer < 2))
1067                 Cvar_SetValueQuick(&gl_combine, 0);
1068
1069         // lightmaps only
1070         r_lightmapscalebit = 0;
1071         if (gl_combine.integer && r_textureunits.integer > 1)
1072                 r_lightmapscalebit += 2;
1073
1074         R_TimeReport("setup");
1075
1076         R_ClearScreen();
1077
1078         R_TimeReport("clear");
1079
1080         if (scr_conlines < vid.conheight && cls.signon == SIGNONS)
1081                 R_RenderView();
1082
1083         // draw 2D stuff
1084         R_DrawQueue();
1085
1086         if (gl_delayfinish.integer)
1087         {
1088                 // tell driver to commit it's partially full geometry queue to the rendering queue
1089                 // (this doesn't wait for the commands themselves to complete)
1090                 qglFlush();
1091         }
1092         else
1093         {
1094                 VID_Finish ();
1095
1096                 R_TimeReport("finish");
1097         }
1098 }
1099
1100
1101 //===========================================================================
1102 // dynamic vertex array buffer subsystem
1103 //===========================================================================
1104
1105 float varray_vertex3f[65536*3];
1106 float varray_color4f[65536*4];
1107 float varray_texcoord2f[4][65536*2];
1108 float varray_texcoord3f[4][65536*3];
1109 float varray_normal3f[65536*3];
1110 int earray_element3i[65536];
1111
1112 //===========================================================================
1113 // vertex array caching subsystem
1114 //===========================================================================
1115
1116 typedef struct rcachearraylink_s
1117 {
1118         struct rcachearraylink_s *next, *prev;
1119         struct rcachearrayitem_s *data;
1120 }
1121 rcachearraylink_t;
1122
1123 typedef struct rcachearrayitem_s
1124 {
1125         // the original request structure
1126         rcachearrayrequest_t request;
1127         // active
1128         int active;
1129         // offset into r_mesh_rcachedata
1130         int offset;
1131         // for linking this into the sequential list
1132         rcachearraylink_t sequentiallink;
1133         // for linking this into the lookup list
1134         rcachearraylink_t hashlink;
1135 }
1136 rcachearrayitem_t;
1137
1138 #define RCACHEARRAY_HASHSIZE 65536
1139 #define RCACHEARRAY_ITEMS 4096
1140 #define RCACHEARRAY_DEFAULTSIZE (4 << 20)
1141
1142 // all active items are linked into this chain in sorted order
1143 static rcachearraylink_t r_mesh_rcachesequentialchain;
1144 // all inactive items are linked into this chain in unknown order
1145 static rcachearraylink_t r_mesh_rcachefreechain;
1146 // all active items are also linked into these chains (using their hashlink)
1147 static rcachearraylink_t r_mesh_rcachechain[RCACHEARRAY_HASHSIZE];
1148
1149 // all items are stored here, whether active or inactive
1150 static rcachearrayitem_t r_mesh_rcacheitems[RCACHEARRAY_ITEMS];
1151
1152 // size of data buffer
1153 static int r_mesh_rcachedata_size = RCACHEARRAY_DEFAULTSIZE;
1154 // data buffer
1155 static qbyte r_mesh_rcachedata[RCACHEARRAY_DEFAULTSIZE];
1156
1157 // current state
1158 static int r_mesh_rcachedata_offset;
1159 static rcachearraylink_t *r_mesh_rcachesequentialchain_current;
1160
1161 static void R_Mesh_CacheArray_Startup(void)
1162 {
1163         int i;
1164         rcachearraylink_t *l;
1165         // prepare all the linked lists
1166         l = &r_mesh_rcachesequentialchain;l->next = l->prev = l;l->data = NULL;
1167         l = &r_mesh_rcachefreechain;l->next = l->prev = l;l->data = NULL;
1168         memset(&r_mesh_rcachechain, 0, sizeof(r_mesh_rcachechain));
1169         for (i = 0;i < RCACHEARRAY_HASHSIZE;i++)
1170         {
1171                 l = &r_mesh_rcachechain[i];
1172                 l->next = l->prev = l;
1173                 l->data = NULL;
1174         }
1175         memset(&r_mesh_rcacheitems, 0, sizeof(r_mesh_rcacheitems));
1176         for (i = 0;i < RCACHEARRAY_ITEMS;i++)
1177         {
1178                 r_mesh_rcacheitems[i].hashlink.data = r_mesh_rcacheitems[i].sequentiallink.data = &r_mesh_rcacheitems[i];
1179                 l = &r_mesh_rcacheitems[i].sequentiallink;
1180                 l->next = &r_mesh_rcachefreechain;
1181                 l->prev = l->next->prev;
1182                 l->next->prev = l->prev->next = l;
1183         }
1184         // clear other state
1185         r_mesh_rcachedata_offset = 0;
1186         r_mesh_rcachesequentialchain_current = &r_mesh_rcachesequentialchain;
1187 }
1188
1189 static void R_Mesh_CacheArray_Shutdown(void)
1190 {
1191 }
1192
1193 /*
1194 static void R_Mesh_CacheArray_ValidateState(int num)
1195 {
1196         rcachearraylink_t *l, *lhead;
1197         lhead = &r_mesh_rcachesequentialchain;
1198         if (r_mesh_rcachesequentialchain_current == lhead)
1199                 return;
1200         for (l = lhead->next;l != lhead;l = l->next)
1201                 if (r_mesh_rcachesequentialchain_current == l)
1202                         return;
1203         Sys_Error("%i", num);
1204 }
1205 */
1206
1207 int R_Mesh_CacheArray(rcachearrayrequest_t *r)
1208 {
1209         rcachearraylink_t *l, *lhead, *lnext;
1210         rcachearrayitem_t *d;
1211         int hashindex, offset, offsetend;
1212
1213         //R_Mesh_CacheArray_ValidateState(3);
1214         // calculate a hashindex to choose a cache chain
1215         r->data = NULL;
1216         hashindex = CRC_Block((void *)r, sizeof(*r)) % RCACHEARRAY_HASHSIZE;
1217
1218         // is it already cached?
1219         for (lhead = &r_mesh_rcachechain[hashindex], l = lhead->next;l != lhead;l = l->next)
1220         {
1221                 if (!memcmp(&l->data->request, r, sizeof(l->data->request)))
1222                 {
1223                         // we have it cached already
1224                         r->data = r_mesh_rcachedata + l->data->offset;
1225                         return false;
1226                 }
1227         }
1228
1229         // we need to add a new cache item, this means finding a place for the new
1230         // data and making sure we have a free item available, lots of work...
1231
1232         // check if buffer needs to wrap
1233         if (r_mesh_rcachedata_offset + r->data_size > r_mesh_rcachedata_size)
1234         {
1235                 /*
1236                 if (r->data_size * 10 > r_mesh_rcachedata_size)
1237                 {
1238                         // realloc whole cache
1239                 }
1240                 */
1241                 // reset back to start
1242                 r_mesh_rcachedata_offset = 0;
1243                 r_mesh_rcachesequentialchain_current = &r_mesh_rcachesequentialchain;
1244         }
1245         offset = r_mesh_rcachedata_offset;
1246         r_mesh_rcachedata_offset += r->data_size;
1247         offsetend = r_mesh_rcachedata_offset;
1248         //R_Mesh_CacheArray_ValidateState(4);
1249
1250         /*
1251         {
1252                 int n;
1253                 for (lhead = &r_mesh_rcachesequentialchain, l = lhead->next, n = 0;l != lhead;l = l->next, n++);
1254                 Con_Printf("R_Mesh_CacheArray: new data range %i:%i, %i items are already linked\n", offset, offsetend, n);
1255         }
1256         */
1257
1258         // make room for the new data (remove old items)
1259         lhead = &r_mesh_rcachesequentialchain;
1260         l = r_mesh_rcachesequentialchain_current;
1261         if (l == lhead)
1262                 l = l->next;
1263         while (l != lhead && l->data->offset < offsetend && l->data->offset + l->data->request.data_size > offset)
1264         {
1265         //r_mesh_rcachesequentialchain_current = l;
1266         //R_Mesh_CacheArray_ValidateState(8);
1267                 lnext = l->next;
1268                 // if at the end of the chain, wrap around
1269                 if (lnext == lhead)
1270                         lnext = lnext->next;
1271         //r_mesh_rcachesequentialchain_current = lnext;
1272         //R_Mesh_CacheArray_ValidateState(10);
1273
1274                 // unlink from sequential chain
1275                 l->next->prev = l->prev;
1276                 l->prev->next = l->next;
1277         //R_Mesh_CacheArray_ValidateState(11);
1278                 // link into free chain
1279                 l->next = &r_mesh_rcachefreechain;
1280                 l->prev = l->next->prev;
1281                 l->next->prev = l->prev->next = l;
1282         //R_Mesh_CacheArray_ValidateState(12);
1283
1284                 l = &l->data->hashlink;
1285                 // unlink from hash chain
1286                 l->next->prev = l->prev;
1287                 l->prev->next = l->next;
1288
1289                 l = lnext;
1290         //r_mesh_rcachesequentialchain_current = l;
1291         //R_Mesh_CacheArray_ValidateState(9);
1292         }
1293         //r_mesh_rcachesequentialchain_current = l;
1294         //R_Mesh_CacheArray_ValidateState(5);
1295         // gobble an extra item if we have no free items available
1296         if (r_mesh_rcachefreechain.next == &r_mesh_rcachefreechain)
1297         {
1298                 lnext = l->next;
1299
1300                 // unlink from sequential chain
1301                 l->next->prev = l->prev;
1302                 l->prev->next = l->next;
1303                 // link into free chain
1304                 l->next = &r_mesh_rcachefreechain;
1305                 l->prev = l->next->prev;
1306                 l->next->prev = l->prev->next = l;
1307
1308                 l = &l->data->hashlink;
1309                 // unlink from hash chain
1310                 l->next->prev = l->prev;
1311                 l->prev->next = l->next;
1312
1313                 l = lnext;
1314         }
1315         r_mesh_rcachesequentialchain_current = l;
1316         //R_Mesh_CacheArray_ValidateState(6);
1317
1318         // now take an item from the free chain
1319         l = r_mesh_rcachefreechain.next;
1320         // set it up
1321         d = l->data;
1322         d->request = *r;
1323         d->offset = offset;
1324         // unlink
1325         l->next->prev = l->prev;
1326         l->prev->next = l->next;
1327         // relink to sequential
1328         l->next = r_mesh_rcachesequentialchain_current->prev;
1329         l->prev = l->next->prev;
1330         while (l->next->data && l->data && l->next->data->offset <= d->offset)
1331         {
1332                 //Con_Printf(">\n");
1333                 l->next = l->next->next;
1334                 l->prev = l->prev->next;
1335         }
1336         while (l->prev->data && l->data && l->prev->data->offset >= d->offset)
1337         {
1338                 //Con_Printf("<\n");
1339                 l->prev = l->prev->prev;
1340                 l->next = l->next->prev;
1341         }
1342         l->next->prev = l->prev->next = l;
1343         // also link into hash chain
1344         l = &l->data->hashlink;
1345         l->next = &r_mesh_rcachechain[hashindex];
1346         l->prev = l->next->prev;
1347         l->prev->next = l;
1348         l->next->prev = l->prev->next = l;
1349
1350
1351         //r_mesh_rcachesequentialchain_current = d->sequentiallink.next;
1352
1353         //R_Mesh_CacheArray_ValidateState(7);
1354         // and finally set the data pointer
1355         r->data = r_mesh_rcachedata + d->offset;
1356         // and tell the caller to fill the array
1357         return true;
1358 }
1359