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_paranoid = {0, "gl_paranoid", "0"};
  11 cvar_t gl_printcheckerror = {0, "gl_printcheckerror", "0"};
  12 cvar_t r_stereo_separation = {0, "r_stereo_separation", "4"};
  13 cvar_t r_stereo_sidebyside = {0, "r_stereo_sidebyside", "0"};
  14 cvar_t r_stereo_redblue = {0, "r_stereo_redblue", "0"};
  15 cvar_t r_stereo_redcyan = {0, "r_stereo_redcyan", "0"};
  16 cvar_t r_stereo_redgreen = {0, "r_stereo_redgreen", "0"};
  17
  18 cvar_t r_render = {0, "r_render", "1"};
  19 cvar_t r_waterwarp = {CVAR_SAVE, "r_waterwarp", "1"};
  20 cvar_t gl_polyblend = {CVAR_SAVE, "gl_polyblend", "1"};
  21 cvar_t gl_dither = {CVAR_SAVE, "gl_dither", "1"}; // whether or not to use dithering
  22 cvar_t gl_lockarrays = {0, "gl_lockarrays", "1"};
  23
  24 int gl_maxdrawrangeelementsvertices;
  25 int gl_maxdrawrangeelementsindices;
  26
  27 #ifdef DEBUGGL
  28 int errornumber = 0;
  29
  30 void GL_PrintError(int errornumber, char *filename, int linenumber)
  31 {
  32         switch(errornumber)
  33         {
  34 #ifdef GL_INVALID_ENUM
  35         case GL_INVALID_ENUM:
  36                 Con_Printf("GL_INVALID_ENUM at %s:%i\n", filename, linenumber);
  37                 break;
  38 #endif
  39 #ifdef GL_INVALID_VALUE
  40         case GL_INVALID_VALUE:
  41                 Con_Printf("GL_INVALID_VALUE at %s:%i\n", filename, linenumber);
  42                 break;
  43 #endif
  44 #ifdef GL_INVALID_OPERATION
  45         case GL_INVALID_OPERATION:
  46                 Con_Printf("GL_INVALID_OPERATION at %s:%i\n", filename, linenumber);
  47                 break;
  48 #endif
  49 #ifdef GL_STACK_OVERFLOW
  50         case GL_STACK_OVERFLOW:
  51                 Con_Printf("GL_STACK_OVERFLOW at %s:%i\n", filename, linenumber);
  52                 break;
  53 #endif
  54 #ifdef GL_STACK_UNDERFLOW
  55         case GL_STACK_UNDERFLOW:
  56                 Con_Printf("GL_STACK_UNDERFLOW at %s:%i\n", filename, linenumber);
  57                 break;
  58 #endif
  59 #ifdef GL_OUT_OF_MEMORY
  60         case GL_OUT_OF_MEMORY:
  61                 Con_Printf("GL_OUT_OF_MEMORY at %s:%i\n", filename, linenumber);
  62                 break;
  63 #endif
  64 #ifdef GL_TABLE_TOO_LARGE
  65         case GL_TABLE_TOO_LARGE:
  66                 Con_Printf("GL_TABLE_TOO_LARGE at %s:%i\n", filename, linenumber);
  67                 break;
  68 #endif
  69         default:
  70                 Con_Printf("GL UNKNOWN (%i) at %s:%i\n", errornumber, filename, linenumber);
  71                 break;
  72         }
  73 }
  74 #endif
  75
  76 #define BACKENDACTIVECHECK if (!backendactive) Sys_Error("GL backend function called when backend is not active");
  77
  78 void SCR_ScreenShot_f (void);
  79
  80 static matrix4x4_t backend_viewmatrix;
  81 static matrix4x4_t backend_modelmatrix;
  82 static matrix4x4_t backend_modelviewmatrix;
  83 static matrix4x4_t backend_glmodelviewmatrix;
  84 static matrix4x4_t backend_projectmatrix;
  85
  86 static unsigned int backendunits, backendimageunits, backendarrayunits, backendactive;
  87
  88 /*
  89 note: here's strip order for a terrain row:
  90 0--1--2--3--4
  91 |\ |\ |\ |\ |
  92 | \| \| \| \|
  93 A--B--C--D--E
  94 clockwise
  95
  96 A0B, 01B, B1C, 12C, C2D, 23D, D3E, 34E
  97
  98 *elements++ = i + row;
  99 *elements++ = i;
 100 *elements++ = i + row + 1;
 101 *elements++ = i;
 102 *elements++ = i + 1;
 103 *elements++ = i + row + 1;
 104
 105
 106 for (y = 0;y < rows - 1;y++)
 107 {
 108         for (x = 0;x < columns - 1;x++)
 109         {
 110                 i = y * rows + x;
 111                 *elements++ = i + columns;
 112                 *elements++ = i;
 113                 *elements++ = i + columns + 1;
 114                 *elements++ = i;
 115                 *elements++ = i + 1;
 116                 *elements++ = i + columns + 1;
 117         }
 118 }
 119
 120 alternative:
 121 0--1--2--3--4
 122 | /| /|\ | /|
 123 |/ |/ | \|/ |
 124 A--B--C--D--E
 125 counterclockwise
 126
 127 for (y = 0;y < rows - 1;y++)
 128 {
 129         for (x = 0;x < columns - 1;x++)
 130         {
 131                 i = y * rows + x;
 132                 *elements++ = i;
 133                 *elements++ = i + columns;
 134                 *elements++ = i + columns + 1;
 135                 *elements++ = i + columns;
 136                 *elements++ = i + columns + 1;
 137                 *elements++ = i + 1;
 138         }
 139 }
 140 */
 141
 142 int polygonelements[768];
 143
 144 static void R_Mesh_CacheArray_Startup(void);
 145 static void R_Mesh_CacheArray_Shutdown(void);
 146 void GL_Backend_AllocArrays(void)
 147 {
 148         R_Mesh_CacheArray_Startup();
 149 }
 150
 151 void GL_Backend_FreeArrays(void)
 152 {
 153         R_Mesh_CacheArray_Shutdown();
 154 }
 155
 156 static void gl_backend_start(void)
 157 {
 158         Con_Print("OpenGL Backend starting...\n");
 159         CHECKGLERROR
 160
 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_Printf("glDrawRangeElements detected (max vertices %i, max indices %i)\n", gl_maxdrawrangeelementsvertices, gl_maxdrawrangeelementsindices);
 169         }
 170
 171         backendunits = min(MAX_TEXTUREUNITS, gl_textureunits);
 172         backendimageunits = backendunits;
 173         backendarrayunits = backendunits;
 174         if (gl_support_fragment_shader)
 175         {
 176                 CHECKGLERROR
 177                 qglGetIntegerv(GL_MAX_TEXTURE_IMAGE_UNITS_ARB, (int *)&backendimageunits);
 178                 CHECKGLERROR
 179                 qglGetIntegerv(GL_MAX_TEXTURE_COORDS_ARB, (int *)&backendarrayunits);
 180                 CHECKGLERROR
 181                 Con_Printf("GLSL shader support detected: texture units = %i texenv, %i image, %i array\n", backendunits, backendimageunits, backendarrayunits);
 182         }
 183         else if (backendunits > 1)
 184                 Con_Printf("multitexture detected: texture units = %i\n", backendunits);
 185         else
 186                 Con_Printf("singletexture\n");
 187
 188         GL_Backend_AllocArrays();
 189
 190         Con_Printf("OpenGL backend started.\n");
 191
 192         CHECKGLERROR
 193
 194         backendactive = true;
 195 }
 196
 197 static void gl_backend_shutdown(void)
 198 {
 199         backendunits = 0;
 200         backendimageunits = 0;
 201         backendarrayunits = 0;
 202         backendactive = false;
 203
 204         Con_Print("OpenGL Backend shutting down\n");
 205
 206         GL_Backend_FreeArrays();
 207 }
 208
 209 static void gl_backend_newmap(void)
 210 {
 211 }
 212
 213 cvar_t scr_zoomwindow = {CVAR_SAVE, "scr_zoomwindow", "0"};
 214 cvar_t scr_zoomwindow_viewsizex = {CVAR_SAVE, "scr_zoomwindow_viewsizex", "20"};
 215 cvar_t scr_zoomwindow_viewsizey = {CVAR_SAVE, "scr_zoomwindow_viewsizey", "20"};
 216 cvar_t scr_zoomwindow_fov = {CVAR_SAVE, "scr_zoomwindow_fov", "20"};
 217
 218 void gl_backend_init(void)
 219 {
 220         int i;
 221
 222         for (i = 0;i < POLYGONELEMENTS_MAXPOINTS - 2;i++)
 223         {
 224                 polygonelements[i * 3 + 0] = 0;
 225                 polygonelements[i * 3 + 1] = i + 1;
 226                 polygonelements[i * 3 + 2] = i + 2;
 227         }
 228
 229         Cvar_RegisterVariable(&r_render);
 230         Cvar_RegisterVariable(&r_waterwarp);
 231         Cvar_RegisterVariable(&r_stereo_separation);
 232         Cvar_RegisterVariable(&r_stereo_sidebyside);
 233         Cvar_RegisterVariable(&r_stereo_redblue);
 234         Cvar_RegisterVariable(&r_stereo_redcyan);
 235         Cvar_RegisterVariable(&r_stereo_redgreen);
 236         Cvar_RegisterVariable(&gl_polyblend);
 237         Cvar_RegisterVariable(&gl_dither);
 238         Cvar_RegisterVariable(&gl_lockarrays);
 239         Cvar_RegisterVariable(&gl_paranoid);
 240         Cvar_RegisterVariable(&gl_printcheckerror);
 241 #ifdef NORENDER
 242         Cvar_SetValue("r_render", 0);
 243 #endif
 244
 245         Cvar_RegisterVariable(&gl_mesh_drawrangeelements);
 246         Cvar_RegisterVariable(&gl_mesh_testarrayelement);
 247         Cvar_RegisterVariable(&gl_mesh_testmanualfeeding);
 248
 249         Cvar_RegisterVariable(&scr_zoomwindow);
 250         Cvar_RegisterVariable(&scr_zoomwindow_viewsizex);
 251         Cvar_RegisterVariable(&scr_zoomwindow_viewsizey);
 252         Cvar_RegisterVariable(&scr_zoomwindow_fov);
 253
 254         R_RegisterModule("GL_Backend", gl_backend_start, gl_backend_shutdown, gl_backend_newmap);
 255 }
 256
 257 void GL_SetupView_Orientation_Identity (void)
 258 {
 259         Matrix4x4_CreateIdentity(&backend_viewmatrix);
 260         memset(&backend_modelmatrix, 0, sizeof(backend_modelmatrix));
 261 }
 262
 263 void GL_SetupView_Orientation_FromEntity(matrix4x4_t *matrix)
 264 {
 265         matrix4x4_t tempmatrix, basematrix;
 266         Matrix4x4_Invert_Simple(&tempmatrix, matrix);
 267         Matrix4x4_CreateRotate(&basematrix, -90, 1, 0, 0);
 268         Matrix4x4_ConcatRotate(&basematrix, 90, 0, 0, 1);
 269         Matrix4x4_Concat(&backend_viewmatrix, &basematrix, &tempmatrix);
 270         //Matrix4x4_ConcatRotate(&backend_viewmatrix, -angles[2], 1, 0, 0);
 271         //Matrix4x4_ConcatRotate(&backend_viewmatrix, -angles[0], 0, 1, 0);
 272         //Matrix4x4_ConcatRotate(&backend_viewmatrix, -angles[1], 0, 0, 1);
 273         //Matrix4x4_ConcatTranslate(&backend_viewmatrix, -origin[0], -origin[1], -origin[2]);
 274         memset(&backend_modelmatrix, 0, sizeof(backend_modelmatrix));
 275 }
 276
 277 void GL_SetupView_Mode_Perspective (double frustumx, double frustumy, double zNear, double zFar)
 278 {
 279         double m[16];
 280
 281         if (!r_render.integer)
 282                 return;
 283
 284         // set up viewpoint
 285         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 286         qglLoadIdentity();CHECKGLERROR
 287         // set view pyramid
 288         qglFrustum(-frustumx * zNear, frustumx * zNear, -frustumy * zNear, frustumy * zNear, zNear, zFar);CHECKGLERROR
 289         qglGetDoublev(GL_PROJECTION_MATRIX, m);
 290         backend_projectmatrix.m[0][0] = m[0];
 291         backend_projectmatrix.m[1][0] = m[1];
 292         backend_projectmatrix.m[2][0] = m[2];
 293         backend_projectmatrix.m[3][0] = m[3];
 294         backend_projectmatrix.m[0][1] = m[4];
 295         backend_projectmatrix.m[1][1] = m[5];
 296         backend_projectmatrix.m[2][1] = m[6];
 297         backend_projectmatrix.m[3][1] = m[7];
 298         backend_projectmatrix.m[0][2] = m[8];
 299         backend_projectmatrix.m[1][2] = m[9];
 300         backend_projectmatrix.m[2][2] = m[10];
 301         backend_projectmatrix.m[3][2] = m[11];
 302         backend_projectmatrix.m[0][3] = m[12];
 303         backend_projectmatrix.m[1][3] = m[13];
 304         backend_projectmatrix.m[2][3] = m[14];
 305         backend_projectmatrix.m[3][3] = m[15];
 306         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 307         GL_SetupView_Orientation_Identity();
 308 }
 309
 310 void GL_SetupView_Mode_PerspectiveInfiniteFarClip (double frustumx, double frustumy, double zNear)
 311 {
 312         double nudge, m[16];
 313
 314         if (!r_render.integer)
 315                 return;
 316
 317         // set up viewpoint
 318         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 319         qglLoadIdentity();CHECKGLERROR
 320         // set view pyramid
 321         nudge = 1.0 - 1.0 / (1<<23);
 322         m[ 0] = 1.0 / frustumx;
 323         m[ 1] = 0;
 324         m[ 2] = 0;
 325         m[ 3] = 0;
 326         m[ 4] = 0;
 327         m[ 5] = 1.0 / frustumy;
 328         m[ 6] = 0;
 329         m[ 7] = 0;
 330         m[ 8] = 0;
 331         m[ 9] = 0;
 332         m[10] = -nudge;
 333         m[11] = -1;
 334         m[12] = 0;
 335         m[13] = 0;
 336         m[14] = -2 * zNear * nudge;
 337         m[15] = 0;
 338         qglLoadMatrixd(m);
 339         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 340         GL_SetupView_Orientation_Identity();
 341         backend_projectmatrix.m[0][0] = m[0];
 342         backend_projectmatrix.m[1][0] = m[1];
 343         backend_projectmatrix.m[2][0] = m[2];
 344         backend_projectmatrix.m[3][0] = m[3];
 345         backend_projectmatrix.m[0][1] = m[4];
 346         backend_projectmatrix.m[1][1] = m[5];
 347         backend_projectmatrix.m[2][1] = m[6];
 348         backend_projectmatrix.m[3][1] = m[7];
 349         backend_projectmatrix.m[0][2] = m[8];
 350         backend_projectmatrix.m[1][2] = m[9];
 351         backend_projectmatrix.m[2][2] = m[10];
 352         backend_projectmatrix.m[3][2] = m[11];
 353         backend_projectmatrix.m[0][3] = m[12];
 354         backend_projectmatrix.m[1][3] = m[13];
 355         backend_projectmatrix.m[2][3] = m[14];
 356         backend_projectmatrix.m[3][3] = m[15];
 357 }
 358
 359 void GL_SetupView_Mode_Ortho (double x1, double y1, double x2, double y2, double zNear, double zFar)
 360 {
 361         double m[16];
 362
 363         if (!r_render.integer)
 364                 return;
 365
 366         // set up viewpoint
 367         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 368         qglLoadIdentity();CHECKGLERROR
 369         qglOrtho(x1, x2, y2, y1, zNear, zFar);
 370         qglGetDoublev(GL_PROJECTION_MATRIX, m);
 371         backend_projectmatrix.m[0][0] = m[0];
 372         backend_projectmatrix.m[1][0] = m[1];
 373         backend_projectmatrix.m[2][0] = m[2];
 374         backend_projectmatrix.m[3][0] = m[3];
 375         backend_projectmatrix.m[0][1] = m[4];
 376         backend_projectmatrix.m[1][1] = m[5];
 377         backend_projectmatrix.m[2][1] = m[6];
 378         backend_projectmatrix.m[3][1] = m[7];
 379         backend_projectmatrix.m[0][2] = m[8];
 380         backend_projectmatrix.m[1][2] = m[9];
 381         backend_projectmatrix.m[2][2] = m[10];
 382         backend_projectmatrix.m[3][2] = m[11];
 383         backend_projectmatrix.m[0][3] = m[12];
 384         backend_projectmatrix.m[1][3] = m[13];
 385         backend_projectmatrix.m[2][3] = m[14];
 386         backend_projectmatrix.m[3][3] = m[15];
 387         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 388         GL_SetupView_Orientation_Identity();
 389 }
 390
 391 typedef struct gltextureunit_s
 392 {
 393         int t1d, t2d, t3d, tcubemap;
 394         int arrayenabled;
 395         unsigned int arraycomponents;
 396         const void *pointer_texcoord;
 397         float rgbscale, alphascale;
 398         int combinergb, combinealpha;
 399         // FIXME: add more combine stuff
 400         // texmatrixenabled exists only to avoid unnecessary texmatrix compares
 401         int texmatrixenabled;
 402         matrix4x4_t matrix;
 403 }
 404 gltextureunit_t;
 405
 406 static struct gl_state_s
 407 {
 408         int blendfunc1;
 409         int blendfunc2;
 410         int blend;
 411         GLboolean depthmask;
 412         int colormask; // stored as bottom 4 bits: r g b a (3 2 1 0 order)
 413         int depthtest;
 414         int scissortest;
 415         unsigned int unit;
 416         unsigned int clientunit;
 417         gltextureunit_t units[MAX_TEXTUREUNITS];
 418         float color4f[4];
 419         int lockrange_first;
 420         int lockrange_count;
 421         const void *pointer_vertex;
 422         const void *pointer_color;
 423 }
 424 gl_state;
 425
 426 void GL_SetupTextureState(void)
 427 {
 428         unsigned int i;
 429         gltextureunit_t *unit;
 430         CHECKGLERROR
 431         gl_state.unit = MAX_TEXTUREUNITS;
 432         gl_state.clientunit = MAX_TEXTUREUNITS;
 433         for (i = 0;i < MAX_TEXTUREUNITS;i++)
 434         {
 435                 unit = gl_state.units + i;
 436                 unit->t1d = 0;
 437                 unit->t2d = 0;
 438                 unit->t3d = 0;
 439                 unit->tcubemap = 0;
 440                 unit->arrayenabled = false;
 441                 unit->arraycomponents = 0;
 442                 unit->pointer_texcoord = NULL;
 443                 unit->rgbscale = 1;
 444                 unit->alphascale = 1;
 445                 unit->combinergb = GL_MODULATE;
 446                 unit->combinealpha = GL_MODULATE;
 447                 unit->texmatrixenabled = false;
 448                 unit->matrix = r_identitymatrix;
 449         }
 450
 451         for (i = 0;i < backendimageunits;i++)
 452         {
 453                 GL_ActiveTexture(i);
 454                 qglBindTexture(GL_TEXTURE_1D, 0);CHECKGLERROR
 455                 qglBindTexture(GL_TEXTURE_2D, 0);CHECKGLERROR
 456                 if (gl_texture3d)
 457                 {
 458                         qglBindTexture(GL_TEXTURE_3D, 0);CHECKGLERROR
 459                 }
 460                 if (gl_texturecubemap)
 461                 {
 462                         qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, 0);CHECKGLERROR
 463                 }
 464         }
 465
 466         for (i = 0;i < backendarrayunits;i++)
 467         {
 468                 GL_ClientActiveTexture(i);
 469                 qglTexCoordPointer(2, GL_FLOAT, sizeof(float[2]), NULL);CHECKGLERROR
 470                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 471         }
 472
 473         for (i = 0;i < backendunits;i++)
 474         {
 475                 GL_ActiveTexture(i);
 476                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 477                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 478                 if (gl_texture3d)
 479                 {
 480                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 481                 }
 482                 if (gl_texturecubemap)
 483                 {
 484                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 485                 }
 486                 qglMatrixMode(GL_TEXTURE);
 487                 qglLoadIdentity();
 488                 qglMatrixMode(GL_MODELVIEW);
 489                 if (gl_combine.integer)
 490                 {
 491                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);CHECKGLERROR
 492                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_MODULATE);CHECKGLERROR
 493                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE);CHECKGLERROR
 494                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 495                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_RGB_ARB, GL_TEXTURE);CHECKGLERROR // for GL_INTERPOLATE_ARB mode
 496                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 497                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 498                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_RGB_ARB, GL_SRC_ALPHA);CHECKGLERROR
 499                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, GL_MODULATE);CHECKGLERROR
 500                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA_ARB, GL_TEXTURE);CHECKGLERROR
 501                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_ALPHA_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 502                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_ALPHA_ARB, GL_CONSTANT_ARB);CHECKGLERROR
 503                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 504                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 505                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 506                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
 507                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
 508                 }
 509                 else
 510                 {
 511                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 512                 }
 513         }
 514         CHECKGLERROR
 515 }
 516
 517 void GL_Backend_ResetState(void)
 518 {
 519         memset(&gl_state, 0, sizeof(gl_state));
 520         gl_state.depthtest = true;
 521         gl_state.blendfunc1 = GL_ONE;
 522         gl_state.blendfunc2 = GL_ZERO;
 523         gl_state.blend = false;
 524         gl_state.depthmask = GL_TRUE;
 525         gl_state.colormask = 15;
 526         gl_state.color4f[0] = gl_state.color4f[1] = gl_state.color4f[2] = gl_state.color4f[3] = 1;
 527         gl_state.lockrange_first = 0;
 528         gl_state.lockrange_count = 0;
 529         gl_state.pointer_vertex = NULL;
 530         gl_state.pointer_color = NULL;
 531
 532         CHECKGLERROR
 533
 534         qglColorMask(1, 1, 1, 1);
 535         qglEnable(GL_CULL_FACE);CHECKGLERROR
 536         qglCullFace(GL_FRONT);CHECKGLERROR
 537         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 538         qglBlendFunc(gl_state.blendfunc1, gl_state.blendfunc2);CHECKGLERROR
 539         qglDisable(GL_BLEND);CHECKGLERROR
 540         qglDepthMask(gl_state.depthmask);CHECKGLERROR
 541
 542         qglVertexPointer(3, GL_FLOAT, sizeof(float[3]), NULL);CHECKGLERROR
 543         qglEnableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 544
 545         qglColorPointer(4, GL_FLOAT, sizeof(float[4]), NULL);CHECKGLERROR
 546         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 547
 548         GL_Color(0, 0, 0, 0);
 549         GL_Color(1, 1, 1, 1);
 550
 551         GL_SetupTextureState();
 552 }
 553
 554 void GL_ActiveTexture(unsigned int num)
 555 {
 556         if (gl_state.unit != num)
 557         {
 558                 gl_state.unit = num;
 559                 if (qglActiveTexture)
 560                 {
 561                         qglActiveTexture(GL_TEXTURE0_ARB + gl_state.unit);
 562                         CHECKGLERROR
 563                 }
 564         }
 565 }
 566
 567 void GL_ClientActiveTexture(unsigned int num)
 568 {
 569         if (gl_state.clientunit != num)
 570         {
 571                 gl_state.clientunit = num;
 572                 if (qglActiveTexture)
 573                 {
 574                         qglClientActiveTexture(GL_TEXTURE0_ARB + gl_state.clientunit);
 575                         CHECKGLERROR
 576                 }
 577         }
 578 }
 579
 580 void GL_BlendFunc(int blendfunc1, int blendfunc2)
 581 {
 582         if (gl_state.blendfunc1 != blendfunc1 || gl_state.blendfunc2 != blendfunc2)
 583         {
 584                 if (r_showtrispass)
 585                         return;
 586                 qglBlendFunc(gl_state.blendfunc1 = blendfunc1, gl_state.blendfunc2 = blendfunc2);CHECKGLERROR
 587                 if (gl_state.blendfunc2 == GL_ZERO)
 588                 {
 589                         if (gl_state.blendfunc1 == GL_ONE)
 590                         {
 591                                 if (gl_state.blend)
 592                                 {
 593                                         gl_state.blend = 0;
 594                                         qglDisable(GL_BLEND);CHECKGLERROR
 595                                 }
 596                         }
 597                         else
 598                         {
 599                                 if (!gl_state.blend)
 600                                 {
 601                                         gl_state.blend = 1;
 602                                         qglEnable(GL_BLEND);CHECKGLERROR
 603                                 }
 604                         }
 605                 }
 606                 else
 607                 {
 608                         if (!gl_state.blend)
 609                         {
 610                                 gl_state.blend = 1;
 611                                 qglEnable(GL_BLEND);CHECKGLERROR
 612                         }
 613                 }
 614         }
 615 }
 616
 617 void GL_DepthMask(int state)
 618 {
 619         if (gl_state.depthmask != state)
 620         {
 621                 if (r_showtrispass)
 622                         return;
 623                 qglDepthMask(gl_state.depthmask = state);CHECKGLERROR
 624         }
 625 }
 626
 627 void GL_DepthTest(int state)
 628 {
 629         if (gl_state.depthtest != state)
 630         {
 631                 if (r_showtrispass)
 632                         return;
 633                 gl_state.depthtest = state;
 634                 if (gl_state.depthtest)
 635                 {
 636                         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 637                 }
 638                 else
 639                 {
 640                         qglDisable(GL_DEPTH_TEST);CHECKGLERROR
 641                 }
 642         }
 643 }
 644
 645 void GL_ColorMask(int r, int g, int b, int a)
 646 {
 647         int state = r*8 + g*4 + b*2 + a*1;
 648         if (gl_state.colormask != state)
 649         {
 650                 if (r_showtrispass)
 651                         return;
 652                 gl_state.colormask = state;
 653                 qglColorMask((GLboolean)r, (GLboolean)g, (GLboolean)b, (GLboolean)a);CHECKGLERROR
 654         }
 655 }
 656
 657 void GL_Color(float cr, float cg, float cb, float ca)
 658 {
 659         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)
 660         {
 661                 if (r_showtrispass)
 662                         return;
 663                 gl_state.color4f[0] = cr;
 664                 gl_state.color4f[1] = cg;
 665                 gl_state.color4f[2] = cb;
 666                 gl_state.color4f[3] = ca;
 667                 CHECKGLERROR
 668                 qglColor4f(gl_state.color4f[0], gl_state.color4f[1], gl_state.color4f[2], gl_state.color4f[3]);
 669                 CHECKGLERROR
 670         }
 671 }
 672
 673 void GL_ShowTrisColor(float cr, float cg, float cb, float ca)
 674 {
 675         if (!r_showtrispass)
 676                 return;
 677         r_showtrispass = false;
 678         GL_Color(cr * r_showtris.value, cg * r_showtris.value, cb * r_showtris.value, ca);
 679         r_showtrispass = true;
 680 }
 681
 682
 683 void GL_LockArrays(int first, int count)
 684 {
 685         if (gl_state.lockrange_count != count || gl_state.lockrange_first != first)
 686         {
 687                 if (gl_state.lockrange_count)
 688                 {
 689                         gl_state.lockrange_count = 0;
 690                         CHECKGLERROR
 691                         qglUnlockArraysEXT();
 692                         CHECKGLERROR
 693                 }
 694                 if (count && gl_supportslockarrays && gl_lockarrays.integer && r_render.integer)
 695                 {
 696                         gl_state.lockrange_first = first;
 697                         gl_state.lockrange_count = count;
 698                         CHECKGLERROR
 699                         qglLockArraysEXT(first, count);
 700                         CHECKGLERROR
 701                 }
 702         }
 703 }
 704
 705 void GL_Scissor (int x, int y, int width, int height)
 706 {
 707         CHECKGLERROR
 708         qglScissor(x, vid.height - (y + height),width,height);
 709         CHECKGLERROR
 710 }
 711
 712 void GL_ScissorTest(int state)
 713 {
 714         if(gl_state.scissortest == state)
 715                 return;
 716
 717         CHECKGLERROR
 718         if((gl_state.scissortest = state))
 719                 qglEnable(GL_SCISSOR_TEST);
 720         else
 721                 qglDisable(GL_SCISSOR_TEST);
 722         CHECKGLERROR
 723 }
 724
 725 void GL_Clear(int mask)
 726 {
 727         if (r_showtrispass)
 728                 return;
 729         qglClear(mask);CHECKGLERROR
 730 }
 731
 732 void GL_TransformToScreen(const vec4_t in, vec4_t out)
 733 {
 734         vec4_t temp;
 735         float iw;
 736         Matrix4x4_Transform4 (&backend_viewmatrix, in, temp);
 737         Matrix4x4_Transform4 (&backend_projectmatrix, temp, out);
 738         iw = 1.0f / out[3];
 739         out[0] = r_view_x + (out[0] * iw + 1.0f) * r_view_width * 0.5f;
 740         out[1] = r_view_y + (out[1] * iw + 1.0f) * r_view_height * 0.5f;
 741         out[2] = r_view_z + (out[2] * iw + 1.0f) * r_view_depth * 0.5f;
 742 }
 743
 744 // called at beginning of frame
 745 void R_Mesh_Start(void)
 746 {
 747         BACKENDACTIVECHECK
 748         CHECKGLERROR
 749         GL_Backend_ResetState();
 750 }
 751
 752 unsigned int GL_Backend_CompileProgram(int vertexstrings_count, const char **vertexstrings_list, int fragmentstrings_count, const char **fragmentstrings_list)
 753 {
 754         GLint vertexshadercompiled, fragmentshadercompiled, programlinked;
 755         GLuint vertexshaderobject, fragmentshaderobject, programobject = 0;
 756         char compilelog[MAX_INPUTLINE];
 757         CHECKGLERROR
 758
 759         programobject = qglCreateProgramObjectARB();
 760         CHECKGLERROR
 761         if (!programobject)
 762                 return 0;
 763
 764         if (vertexstrings_count)
 765         {
 766                 CHECKGLERROR
 767                 vertexshaderobject = qglCreateShaderObjectARB(GL_VERTEX_SHADER_ARB);
 768                 if (!vertexshaderobject)
 769                 {
 770                         qglDeleteObjectARB(programobject);
 771                         CHECKGLERROR
 772                         return 0;
 773                 }
 774                 qglShaderSourceARB(vertexshaderobject, vertexstrings_count, vertexstrings_list, NULL);
 775                 qglCompileShaderARB(vertexshaderobject);
 776                 CHECKGLERROR
 777                 qglGetObjectParameterivARB(vertexshaderobject, GL_OBJECT_COMPILE_STATUS_ARB, &vertexshadercompiled);
 778                 qglGetInfoLogARB(vertexshaderobject, sizeof(compilelog), NULL, compilelog);
 779                 if (compilelog[0])
 780                         Con_Printf("vertex shader compile log:\n%s\n", compilelog);
 781                 if (!vertexshadercompiled)
 782                 {
 783                         qglDeleteObjectARB(programobject);
 784                         qglDeleteObjectARB(vertexshaderobject);
 785                         CHECKGLERROR
 786                         return 0;
 787                 }
 788                 qglAttachObjectARB(programobject, vertexshaderobject);
 789                 qglDeleteObjectARB(vertexshaderobject);
 790                 CHECKGLERROR
 791         }
 792
 793         if (fragmentstrings_count)
 794         {
 795                 CHECKGLERROR
 796                 fragmentshaderobject = qglCreateShaderObjectARB(GL_FRAGMENT_SHADER_ARB);
 797                 if (!fragmentshaderobject)
 798                 {
 799                         qglDeleteObjectARB(programobject);
 800                         CHECKGLERROR
 801                         return 0;
 802                 }
 803                 qglShaderSourceARB(fragmentshaderobject, fragmentstrings_count, fragmentstrings_list, NULL);
 804                 qglCompileShaderARB(fragmentshaderobject);
 805                 CHECKGLERROR
 806                 qglGetObjectParameterivARB(fragmentshaderobject, GL_OBJECT_COMPILE_STATUS_ARB, &fragmentshadercompiled);
 807                 qglGetInfoLogARB(fragmentshaderobject, sizeof(compilelog), NULL, compilelog);
 808                 if (compilelog[0])
 809                         Con_Printf("fragment shader compile log:\n%s\n", compilelog);
 810                 if (!fragmentshadercompiled)
 811                 {
 812                         qglDeleteObjectARB(programobject);
 813                         qglDeleteObjectARB(fragmentshaderobject);
 814                         CHECKGLERROR
 815                         return 0;
 816                 }
 817                 qglAttachObjectARB(programobject, fragmentshaderobject);
 818                 qglDeleteObjectARB(fragmentshaderobject);
 819                 CHECKGLERROR
 820         }
 821
 822         qglLinkProgramARB(programobject);
 823         CHECKGLERROR
 824         qglGetObjectParameterivARB(programobject, GL_OBJECT_LINK_STATUS_ARB, &programlinked);
 825         qglGetInfoLogARB(programobject, sizeof(compilelog), NULL, compilelog);
 826         if (compilelog[0])
 827         {
 828                 Con_Printf("program link log:\n%s\n", compilelog);
 829                 // software vertex shader is ok but software fragment shader is WAY
 830                 // too slow, fail program if so.
 831                 // NOTE: this string might be ATI specific, but that's ok because the
 832                 // ATI R300 chip (Radeon 9500-9800/X300) is the most likely to use a
 833                 // software fragment shader due to low instruction and dependent
 834                 // texture limits.
 835                 if (strstr(compilelog, "fragment shader will run in software"))
 836                         programlinked = false;
 837         }
 838         CHECKGLERROR
 839         if (!programlinked)
 840         {
 841                 qglDeleteObjectARB(programobject);
 842                 return 0;
 843         }
 844         CHECKGLERROR
 845         return programobject;
 846 }
 847
 848 void GL_Backend_FreeProgram(unsigned int prog)
 849 {
 850         CHECKGLERROR
 851         qglDeleteObjectARB(prog);
 852         CHECKGLERROR
 853 }
 854
 855 int gl_backend_rebindtextures;
 856
 857 void GL_Backend_RenumberElements(int *out, int count, const int *in, int offset)
 858 {
 859         int i;
 860         if (offset)
 861         {
 862                 for (i = 0;i < count;i++)
 863                         *out++ = *in++ + offset;
 864         }
 865         else
 866                 memcpy(out, in, sizeof(*out) * count);
 867 }
 868
 869 // renders triangles using vertices from the active arrays
 870 int paranoidblah = 0;
 871 void R_Mesh_Draw(int firstvertex, int numvertices, int numtriangles, const int *elements)
 872 {
 873         unsigned int numelements = numtriangles * 3;
 874         if (numvertices < 3 || numtriangles < 1)
 875         {
 876                 Con_Printf("R_Mesh_Draw(%d, %d, %d, %08p);\n", firstvertex, numvertices, numtriangles, elements);
 877                 return;
 878         }
 879         //CHECKGLERROR
 880         if (r_showtrispass)
 881         {
 882                 R_Mesh_Draw_ShowTris(firstvertex, numvertices, numtriangles, elements);
 883                 return;
 884         }
 885         renderstats.meshes++;
 886         renderstats.meshes_elements += numelements;
 887         if (gl_paranoid.integer)
 888         {
 889                 unsigned int i, j, size;
 890                 const int *p;
 891                 if (!qglIsEnabled(GL_VERTEX_ARRAY))
 892                         Con_Print("R_Mesh_Draw: vertex array not enabled\n");
 893                 for (j = 0, size = numvertices * 3, p = (int *)((float *)gl_state.pointer_vertex + firstvertex * 3);j < size;j++, p++)
 894                         paranoidblah += *p;
 895                 if (gl_state.pointer_color)
 896                 {
 897                         if (!qglIsEnabled(GL_COLOR_ARRAY))
 898                                 Con_Print("R_Mesh_Draw: color array set but not enabled\n");
 899                         for (j = 0, size = numvertices * 4, p = (int *)((float *)gl_state.pointer_color + firstvertex * 4);j < size;j++, p++)
 900                                 paranoidblah += *p;
 901                 }
 902                 for (i = 0;i < backendarrayunits;i++)
 903                 {
 904                         if (gl_state.units[i].arrayenabled)
 905                         {
 906                                 GL_ClientActiveTexture(i);
 907                                 if (!qglIsEnabled(GL_TEXTURE_COORD_ARRAY))
 908                                         Con_Print("R_Mesh_Draw: texcoord array set but not enabled\n");
 909                                 for (j = 0, size = numvertices * gl_state.units[i].arraycomponents, p = (int *)((float *)gl_state.units[i].pointer_texcoord + firstvertex * gl_state.units[i].arraycomponents);j < size;j++, p++)
 910                                         paranoidblah += *p;
 911                         }
 912                 }
 913                 for (i = 0;i < (unsigned int) numtriangles * 3;i++)
 914                 {
 915                         if (elements[i] < firstvertex || elements[i] >= firstvertex + numvertices)
 916                         {
 917                                 Con_Printf("R_Mesh_Draw: invalid vertex index %i (outside range %i - %i) in elements list\n", elements[i], firstvertex, firstvertex + numvertices);
 918                                 return;
 919                         }
 920                 }
 921                 CHECKGLERROR
 922         }
 923         if (r_render.integer)
 924         {
 925                 CHECKGLERROR
 926                 if (gl_mesh_testmanualfeeding.integer)
 927                 {
 928                         unsigned int i, j;
 929                         const GLfloat *p;
 930                         qglBegin(GL_TRIANGLES);
 931                         for (i = 0;i < (unsigned int) numtriangles * 3;i++)
 932                         {
 933                                 for (j = 0;j < backendarrayunits;j++)
 934                                 {
 935                                         if (gl_state.units[j].pointer_texcoord)
 936                                         {
 937                                                 if (backendarrayunits > 1)
 938                                                 {
 939                                                         if (gl_state.units[j].arraycomponents == 4)
 940                                                         {
 941                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 4;
 942                                                                 qglMultiTexCoord4f(GL_TEXTURE0_ARB + j, p[0], p[1], p[2], p[3]);
 943                                                         }
 944                                                         else if (gl_state.units[j].arraycomponents == 3)
 945                                                         {
 946                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 3;
 947                                                                 qglMultiTexCoord3f(GL_TEXTURE0_ARB + j, p[0], p[1], p[2]);
 948                                                         }
 949                                                         else if (gl_state.units[j].arraycomponents == 2)
 950                                                         {
 951                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 2;
 952                                                                 qglMultiTexCoord2f(GL_TEXTURE0_ARB + j, p[0], p[1]);
 953                                                         }
 954                                                         else
 955                                                         {
 956                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 1;
 957                                                                 qglMultiTexCoord1f(GL_TEXTURE0_ARB + j, p[0]);
 958                                                         }
 959                                                 }
 960                                                 else
 961                                                 {
 962                                                         if (gl_state.units[j].arraycomponents == 4)
 963                                                         {
 964                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 4;
 965                                                                 qglTexCoord4f(p[0], p[1], p[2], p[3]);
 966                                                         }
 967                                                         else if (gl_state.units[j].arraycomponents == 3)
 968                                                         {
 969                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 3;
 970                                                                 qglTexCoord3f(p[0], p[1], p[2]);
 971                                                         }
 972                                                         else if (gl_state.units[j].arraycomponents == 2)
 973                                                         {
 974                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 2;
 975                                                                 qglTexCoord2f(p[0], p[1]);
 976                                                         }
 977                                                         else
 978                                                         {
 979                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 1;
 980                                                                 qglTexCoord1f(p[0]);
 981                                                         }
 982                                                 }
 983                                         }
 984                                 }
 985                                 if (gl_state.pointer_color)
 986                                 {
 987                                         p = ((const GLfloat *)(gl_state.pointer_color)) + elements[i] * 4;
 988                                         qglColor4f(p[0], p[1], p[2], p[3]);
 989                                 }
 990                                 p = ((const GLfloat *)(gl_state.pointer_vertex)) + elements[i] * 3;
 991                                 qglVertex3f(p[0], p[1], p[2]);
 992                         }
 993                         qglEnd();
 994                         CHECKGLERROR
 995                 }
 996                 else if (gl_mesh_testarrayelement.integer)
 997                 {
 998                         int i;
 999                         qglBegin(GL_TRIANGLES);
1000                         for (i = 0;i < numtriangles * 3;i++)
1001                         {
1002                                 qglArrayElement(elements[i]);
1003                         }
1004                         qglEnd();
1005                         CHECKGLERROR
1006                 }
1007                 else if (gl_mesh_drawrangeelements.integer && qglDrawRangeElements != NULL)
1008                 {
1009                         qglDrawRangeElements(GL_TRIANGLES, firstvertex, firstvertex + numvertices, numelements, GL_UNSIGNED_INT, elements);
1010                         CHECKGLERROR
1011                 }
1012                 else
1013                 {
1014                         qglDrawElements(GL_TRIANGLES, numelements, GL_UNSIGNED_INT, elements);
1015                         CHECKGLERROR
1016                 }
1017         }
1018 }
1019
1020 // restores backend state, used when done with 3D rendering
1021 void R_Mesh_Finish(void)
1022 {
1023         unsigned int i;
1024         BACKENDACTIVECHECK
1025         CHECKGLERROR
1026         GL_LockArrays(0, 0);
1027         CHECKGLERROR
1028
1029         for (i = 0;i < backendimageunits;i++)
1030         {
1031                 GL_ActiveTexture(i);
1032                 qglBindTexture(GL_TEXTURE_1D, 0);CHECKGLERROR
1033                 qglBindTexture(GL_TEXTURE_2D, 0);CHECKGLERROR
1034                 if (gl_texture3d)
1035                 {
1036                         qglBindTexture(GL_TEXTURE_3D, 0);CHECKGLERROR
1037                 }
1038                 if (gl_texturecubemap)
1039                 {
1040                         qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, 0);CHECKGLERROR
1041                 }
1042         }
1043         for (i = 0;i < backendarrayunits;i++)
1044         {
1045                 GL_ActiveTexture(backendarrayunits - 1 - i);
1046                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
1047         }
1048         for (i = 0;i < backendunits;i++)
1049         {
1050                 GL_ActiveTexture(backendunits - 1 - i);
1051                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
1052                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
1053                 if (gl_texture3d)
1054                 {
1055                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
1056                 }
1057                 if (gl_texturecubemap)
1058                 {
1059                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
1060                 }
1061                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
1062                 if (gl_combine.integer)
1063                 {
1064                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
1065                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
1066                 }
1067         }
1068         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
1069         qglDisableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
1070
1071         qglDisable(GL_BLEND);CHECKGLERROR
1072         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
1073         qglDepthMask(GL_TRUE);CHECKGLERROR
1074         qglBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);CHECKGLERROR
1075 }
1076
1077 void R_Mesh_Matrix(const matrix4x4_t *matrix)
1078 {
1079         if (memcmp(matrix, &backend_modelmatrix, sizeof(matrix4x4_t)))
1080         {
1081                 backend_modelmatrix = *matrix;
1082                 Matrix4x4_Concat(&backend_modelviewmatrix, &backend_viewmatrix, matrix);
1083                 Matrix4x4_Transpose(&backend_glmodelviewmatrix, &backend_modelviewmatrix);
1084                 qglLoadMatrixf(&backend_glmodelviewmatrix.m[0][0]);
1085         }
1086 }
1087
1088 void R_Mesh_VertexPointer(const float *vertex3f)
1089 {
1090         if (gl_state.pointer_vertex != vertex3f)
1091         {
1092                 gl_state.pointer_vertex = vertex3f;
1093                 CHECKGLERROR
1094                 qglVertexPointer(3, GL_FLOAT, sizeof(float[3]), gl_state.pointer_vertex);
1095                 CHECKGLERROR
1096         }
1097 }
1098
1099 void R_Mesh_ColorPointer(const float *color4f)
1100 {
1101         if (r_showtrispass)
1102                 return;
1103         if (gl_state.pointer_color != color4f)
1104         {
1105                 CHECKGLERROR
1106                 if (!gl_state.pointer_color)
1107                 {
1108                         qglEnableClientState(GL_COLOR_ARRAY);
1109                         CHECKGLERROR
1110                 }
1111                 else if (!color4f)
1112                 {
1113                         qglDisableClientState(GL_COLOR_ARRAY);
1114                         CHECKGLERROR
1115                         // when color array is on the glColor gets trashed, set it again
1116                         qglColor4f(gl_state.color4f[0], gl_state.color4f[1], gl_state.color4f[2], gl_state.color4f[3]);
1117                         CHECKGLERROR
1118                 }
1119                 gl_state.pointer_color = color4f;
1120                 qglColorPointer(4, GL_FLOAT, sizeof(float[4]), gl_state.pointer_color);
1121                 CHECKGLERROR
1122         }
1123 }
1124
1125 void R_Mesh_TexCoordPointer(unsigned int unitnum, unsigned int numcomponents, const float *texcoord)
1126 {
1127         gltextureunit_t *unit = gl_state.units + unitnum;
1128         if (r_showtrispass)
1129                 return;
1130         // update array settings
1131         if (texcoord)
1132         {
1133                 // texcoord array
1134                 if (unit->pointer_texcoord != texcoord || unit->arraycomponents != numcomponents)
1135                 {
1136                         unit->pointer_texcoord = texcoord;
1137                         unit->arraycomponents = numcomponents;
1138                         GL_ClientActiveTexture(unitnum);
1139                         qglTexCoordPointer(unit->arraycomponents, GL_FLOAT, sizeof(float) * unit->arraycomponents, unit->pointer_texcoord);
1140                         CHECKGLERROR
1141                 }
1142                 // texture array unit is enabled, enable the array
1143                 if (!unit->arrayenabled)
1144                 {
1145                         unit->arrayenabled = true;
1146                         GL_ClientActiveTexture(unitnum);
1147                         qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
1148                 }
1149         }
1150         else
1151         {
1152                 // texture array unit is disabled, disable the array
1153                 if (unit->arrayenabled)
1154                 {
1155                         unit->arrayenabled = false;
1156                         GL_ClientActiveTexture(unitnum);
1157                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
1158                 }
1159         }
1160 }
1161
1162 void R_Mesh_TexBindAll(unsigned int unitnum, int tex1d, int tex2d, int tex3d, int texcubemap)
1163 {
1164         gltextureunit_t *unit = gl_state.units + unitnum;
1165         if (unitnum >= backendimageunits)
1166                 return;
1167         if (r_showtrispass)
1168                 return;
1169         // update 1d texture binding
1170         if (unit->t1d != tex1d)
1171         {
1172                 GL_ActiveTexture(unitnum);
1173                 if (unitnum < backendunits)
1174                 {
1175                         if (tex1d)
1176                         {
1177                                 if (unit->t1d == 0)
1178                                         qglEnable(GL_TEXTURE_1D);
1179                         }
1180                         else
1181                         {
1182                                 if (unit->t1d)
1183                                         qglDisable(GL_TEXTURE_1D);
1184                         }
1185                 }
1186                 unit->t1d = tex1d;
1187                 qglBindTexture(GL_TEXTURE_1D, unit->t1d);
1188                 CHECKGLERROR
1189         }
1190         // update 2d texture binding
1191         if (unit->t2d != tex2d)
1192         {
1193                 GL_ActiveTexture(unitnum);
1194                 if (unitnum < backendunits)
1195                 {
1196                         if (tex2d)
1197                         {
1198                                 if (unit->t2d == 0)
1199                                         qglEnable(GL_TEXTURE_2D);
1200                         }
1201                         else
1202                         {
1203                                 if (unit->t2d)
1204                                         qglDisable(GL_TEXTURE_2D);
1205                         }
1206                 }
1207                 unit->t2d = tex2d;
1208                 qglBindTexture(GL_TEXTURE_2D, unit->t2d);
1209                 CHECKGLERROR
1210         }
1211         // update 3d texture binding
1212         if (unit->t3d != tex3d)
1213         {
1214                 GL_ActiveTexture(unitnum);
1215                 if (unitnum < backendunits)
1216                 {
1217                         if (tex3d)
1218                         {
1219                                 if (unit->t3d == 0)
1220                                         qglEnable(GL_TEXTURE_3D);
1221                         }
1222                         else
1223                         {
1224                                 if (unit->t3d)
1225                                         qglDisable(GL_TEXTURE_3D);
1226                         }
1227                 }
1228                 unit->t3d = tex3d;
1229                 qglBindTexture(GL_TEXTURE_3D, unit->t3d);
1230                 CHECKGLERROR
1231         }
1232         // update cubemap texture binding
1233         if (unit->tcubemap != texcubemap)
1234         {
1235                 GL_ActiveTexture(unitnum);
1236                 if (unitnum < backendunits)
1237                 {
1238                         if (texcubemap)
1239                         {
1240                                 if (unit->tcubemap == 0)
1241                                         qglEnable(GL_TEXTURE_CUBE_MAP_ARB);
1242                         }
1243                         else
1244                         {
1245                                 if (unit->tcubemap)
1246                                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);
1247                         }
1248                 }
1249                 unit->tcubemap = texcubemap;
1250                 qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, unit->tcubemap);
1251                 CHECKGLERROR
1252         }
1253 }
1254
1255 void R_Mesh_TexBind1D(unsigned int unitnum, int texnum)
1256 {
1257         gltextureunit_t *unit = gl_state.units + unitnum;
1258         if (unitnum >= backendimageunits)
1259                 return;
1260         if (r_showtrispass)
1261                 return;
1262         // update 1d texture binding
1263         if (unit->t1d != texnum)
1264         {
1265                 GL_ActiveTexture(unitnum);
1266                 if (unitnum < backendunits)
1267                 {
1268                         if (texnum)
1269                         {
1270                                 if (unit->t1d == 0)
1271                                         qglEnable(GL_TEXTURE_1D);
1272                         }
1273                         else
1274                         {
1275                                 if (unit->t1d)
1276                                         qglDisable(GL_TEXTURE_1D);
1277                         }
1278                 }
1279                 unit->t1d = texnum;
1280                 qglBindTexture(GL_TEXTURE_1D, unit->t1d);
1281                 CHECKGLERROR
1282         }
1283         // update 2d texture binding
1284         if (unit->t2d)
1285         {
1286                 GL_ActiveTexture(unitnum);
1287                 if (unitnum < backendunits)
1288                 {
1289                         if (unit->t2d)
1290                                 qglDisable(GL_TEXTURE_2D);
1291                 }
1292                 unit->t2d = 0;
1293                 qglBindTexture(GL_TEXTURE_2D, unit->t2d);
1294                 CHECKGLERROR
1295         }
1296         // update 3d texture binding
1297         if (unit->t3d)
1298         {
1299                 GL_ActiveTexture(unitnum);
1300                 if (unitnum < backendunits)
1301                 {
1302                         if (unit->t3d)
1303                                 qglDisable(GL_TEXTURE_3D);
1304                 }
1305                 unit->t3d = 0;
1306                 qglBindTexture(GL_TEXTURE_3D, unit->t3d);
1307                 CHECKGLERROR
1308         }
1309         // update cubemap texture binding
1310         if (unit->tcubemap)
1311         {
1312                 GL_ActiveTexture(unitnum);
1313                 if (unitnum < backendunits)
1314                 {
1315                         if (unit->tcubemap)
1316                                 qglDisable(GL_TEXTURE_CUBE_MAP_ARB);
1317                 }
1318                 unit->tcubemap = 0;
1319                 qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, unit->tcubemap);
1320                 CHECKGLERROR
1321         }
1322 }
1323
1324 void R_Mesh_TexBind(unsigned int unitnum, int texnum)
1325 {
1326         gltextureunit_t *unit = gl_state.units + unitnum;
1327         if (unitnum >= backendimageunits)
1328                 return;
1329         if (r_showtrispass)
1330                 return;
1331         // update 1d texture binding
1332         if (unit->t1d)
1333         {
1334                 GL_ActiveTexture(unitnum);
1335                 if (unitnum < backendunits)
1336                 {
1337                         if (unit->t1d)
1338                                 qglDisable(GL_TEXTURE_1D);
1339                 }
1340                 unit->t1d = 0;
1341                 qglBindTexture(GL_TEXTURE_1D, unit->t1d);
1342                 CHECKGLERROR
1343         }
1344         // update 2d texture binding
1345         if (unit->t2d != texnum)
1346         {
1347                 GL_ActiveTexture(unitnum);
1348                 if (unitnum < backendunits)
1349                 {
1350                         if (texnum)
1351                         {
1352                                 if (unit->t2d == 0)
1353                                         qglEnable(GL_TEXTURE_2D);
1354                         }
1355                         else
1356                         {
1357                                 if (unit->t2d)
1358                                         qglDisable(GL_TEXTURE_2D);
1359                         }
1360                 }
1361                 unit->t2d = texnum;
1362                 qglBindTexture(GL_TEXTURE_2D, unit->t2d);
1363                 CHECKGLERROR
1364         }
1365         // update 3d texture binding
1366         if (unit->t3d)
1367         {
1368                 GL_ActiveTexture(unitnum);
1369                 if (unitnum < backendunits)
1370                 {
1371                         if (unit->t3d)
1372                                 qglDisable(GL_TEXTURE_3D);
1373                 }
1374                 unit->t3d = 0;
1375                 qglBindTexture(GL_TEXTURE_3D, unit->t3d);
1376                 CHECKGLERROR
1377         }
1378         // update cubemap texture binding
1379         if (unit->tcubemap != 0)
1380         {
1381                 GL_ActiveTexture(unitnum);
1382                 if (unitnum < backendunits)
1383                 {
1384                         if (unit->tcubemap)
1385                                 qglDisable(GL_TEXTURE_CUBE_MAP_ARB);
1386                 }
1387                 unit->tcubemap = 0;
1388                 qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, unit->tcubemap);
1389                 CHECKGLERROR
1390         }
1391 }
1392
1393 void R_Mesh_TexBind3D(unsigned int unitnum, int texnum)
1394 {
1395         gltextureunit_t *unit = gl_state.units + unitnum;
1396         if (unitnum >= backendimageunits)
1397                 return;
1398         if (r_showtrispass)
1399                 return;
1400         // update 1d texture binding
1401         if (unit->t1d)
1402         {
1403                 GL_ActiveTexture(unitnum);
1404                 if (unitnum < backendunits)
1405                 {
1406                         if (unit->t1d)
1407                                 qglDisable(GL_TEXTURE_1D);
1408                 }
1409                 unit->t1d = 0;
1410                 qglBindTexture(GL_TEXTURE_1D, unit->t1d);
1411                 CHECKGLERROR
1412         }
1413         // update 2d texture binding
1414         if (unit->t2d)
1415         {
1416                 GL_ActiveTexture(unitnum);
1417                 if (unitnum < backendunits)
1418                 {
1419                         if (unit->t2d)
1420                                 qglDisable(GL_TEXTURE_2D);
1421                 }
1422                 unit->t2d = 0;
1423                 qglBindTexture(GL_TEXTURE_2D, unit->t2d);
1424                 CHECKGLERROR
1425         }
1426         // update 3d texture binding
1427         if (unit->t3d != texnum)
1428         {
1429                 GL_ActiveTexture(unitnum);
1430                 if (unitnum < backendunits)
1431                 {
1432                         if (texnum)
1433                         {
1434                                 if (unit->t3d == 0)
1435                                         qglEnable(GL_TEXTURE_3D);
1436                         }
1437                         else
1438                         {
1439                                 if (unit->t3d)
1440                                         qglDisable(GL_TEXTURE_3D);
1441                         }
1442                 }
1443                 unit->t3d = texnum;
1444                 qglBindTexture(GL_TEXTURE_3D, unit->t3d);
1445                 CHECKGLERROR
1446         }
1447         // update cubemap texture binding
1448         if (unit->tcubemap != 0)
1449         {
1450                 GL_ActiveTexture(unitnum);
1451                 if (unitnum < backendunits)
1452                 {
1453                         if (unit->tcubemap)
1454                                 qglDisable(GL_TEXTURE_CUBE_MAP_ARB);
1455                 }
1456                 unit->tcubemap = 0;
1457                 qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, unit->tcubemap);
1458                 CHECKGLERROR
1459         }
1460 }
1461
1462 void R_Mesh_TexBindCubeMap(unsigned int unitnum, int texnum)
1463 {
1464         gltextureunit_t *unit = gl_state.units + unitnum;
1465         if (unitnum >= backendimageunits)
1466                 return;
1467         if (r_showtrispass)
1468                 return;
1469         // update 1d texture binding
1470         if (unit->t1d)
1471         {
1472                 GL_ActiveTexture(unitnum);
1473                 if (unitnum < backendunits)
1474                 {
1475                         if (unit->t1d)
1476                                 qglDisable(GL_TEXTURE_1D);
1477                 }
1478                 unit->t1d = 0;
1479                 qglBindTexture(GL_TEXTURE_1D, unit->t1d);
1480                 CHECKGLERROR
1481         }
1482         // update 2d texture binding
1483         if (unit->t2d)
1484         {
1485                 GL_ActiveTexture(unitnum);
1486                 if (unitnum < backendunits)
1487                 {
1488                         if (unit->t2d)
1489                                 qglDisable(GL_TEXTURE_2D);
1490                 }
1491                 unit->t2d = 0;
1492                 qglBindTexture(GL_TEXTURE_2D, unit->t2d);
1493                 CHECKGLERROR
1494         }
1495         // update 3d texture binding
1496         if (unit->t3d)
1497         {
1498                 GL_ActiveTexture(unitnum);
1499                 if (unitnum < backendunits)
1500                 {
1501                         if (unit->t3d)
1502                                 qglDisable(GL_TEXTURE_3D);
1503                 }
1504                 unit->t3d = 0;
1505                 qglBindTexture(GL_TEXTURE_3D, unit->t3d);
1506                 CHECKGLERROR
1507         }
1508         // update cubemap texture binding
1509         if (unit->tcubemap != texnum)
1510         {
1511                 GL_ActiveTexture(unitnum);
1512                 if (unitnum < backendunits)
1513                 {
1514                         if (texnum)
1515                         {
1516                                 if (unit->tcubemap == 0)
1517                                         qglEnable(GL_TEXTURE_CUBE_MAP_ARB);
1518                         }
1519                         else
1520                         {
1521                                 if (unit->tcubemap)
1522                                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);
1523                         }
1524                 }
1525                 unit->tcubemap = texnum;
1526                 qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, unit->tcubemap);
1527                 CHECKGLERROR
1528         }
1529 }
1530
1531 void R_Mesh_TexMatrix(unsigned int unitnum, const matrix4x4_t *matrix)
1532 {
1533         gltextureunit_t *unit = gl_state.units + unitnum;
1534         if (r_showtrispass)
1535                 return;
1536         if (matrix->m[3][3])
1537         {
1538                 // texmatrix specified, check if it is different
1539                 if (!unit->texmatrixenabled || memcmp(&unit->matrix, matrix, sizeof(matrix4x4_t)))
1540                 {
1541                         matrix4x4_t tempmatrix;
1542                         unit->texmatrixenabled = true;
1543                         unit->matrix = *matrix;
1544                         Matrix4x4_Transpose(&tempmatrix, &unit->matrix);
1545                         qglMatrixMode(GL_TEXTURE);
1546                         GL_ActiveTexture(unitnum);
1547                         qglLoadMatrixf(&tempmatrix.m[0][0]);
1548                         qglMatrixMode(GL_MODELVIEW);
1549                 }
1550         }
1551         else
1552         {
1553                 // no texmatrix specified, revert to identity
1554                 if (unit->texmatrixenabled)
1555                 {
1556                         unit->texmatrixenabled = false;
1557                         qglMatrixMode(GL_TEXTURE);
1558                         GL_ActiveTexture(unitnum);
1559                         qglLoadIdentity();
1560                         qglMatrixMode(GL_MODELVIEW);
1561                 }
1562         }
1563 }
1564
1565 void R_Mesh_TexCombine(unsigned int unitnum, int combinergb, int combinealpha, int rgbscale, int alphascale)
1566 {
1567         gltextureunit_t *unit = gl_state.units + unitnum;
1568         if (r_showtrispass)
1569                 return;
1570         if (gl_combine.integer)
1571         {
1572                 // GL_ARB_texture_env_combine
1573                 if (!combinergb)
1574                         combinergb = GL_MODULATE;
1575                 if (!combinealpha)
1576                         combinealpha = GL_MODULATE;
1577                 if (!rgbscale)
1578                         rgbscale = 1;
1579                 if (!alphascale)
1580                         alphascale = 1;
1581                 if (unit->combinergb != combinergb)
1582                 {
1583                         unit->combinergb = combinergb;
1584                         GL_ActiveTexture(unitnum);
1585                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, unit->combinergb);CHECKGLERROR
1586                 }
1587                 if (unit->combinealpha != combinealpha)
1588                 {
1589                         unit->combinealpha = combinealpha;
1590                         GL_ActiveTexture(unitnum);
1591                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, unit->combinealpha);CHECKGLERROR
1592                 }
1593                 if (unit->rgbscale != rgbscale)
1594                 {
1595                         GL_ActiveTexture(unitnum);
1596                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, (unit->rgbscale = rgbscale));CHECKGLERROR
1597                 }
1598                 if (unit->alphascale != alphascale)
1599                 {
1600                         GL_ActiveTexture(unitnum);
1601                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, (unit->alphascale = alphascale));CHECKGLERROR
1602                 }
1603         }
1604         else
1605         {
1606                 // normal GL texenv
1607                 if (!combinergb)
1608                         combinergb = GL_MODULATE;
1609                 if (unit->combinergb != combinergb)
1610                 {
1611                         unit->combinergb = combinergb;
1612                         GL_ActiveTexture(unitnum);
1613                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, unit->combinergb);CHECKGLERROR
1614                 }
1615         }
1616 }
1617
1618 void R_Mesh_State(const rmeshstate_t *m)
1619 {
1620         unsigned int i;
1621
1622         BACKENDACTIVECHECK
1623
1624         R_Mesh_VertexPointer(m->pointer_vertex);
1625         R_Mesh_ColorPointer(m->pointer_color);
1626
1627         if (gl_backend_rebindtextures)
1628         {
1629                 gl_backend_rebindtextures = false;
1630                 GL_SetupTextureState();
1631         }
1632
1633         for (i = 0;i < backendimageunits;i++)
1634                 R_Mesh_TexBindAll(i, m->tex1d[i], m->tex[i], m->tex3d[i], m->texcubemap[i]);
1635         for (i = 0;i < backendarrayunits;i++)
1636         {
1637                 if (m->pointer_texcoord3f[i])
1638                         R_Mesh_TexCoordPointer(i, 3, m->pointer_texcoord3f[i]);
1639                 else
1640                         R_Mesh_TexCoordPointer(i, 2, m->pointer_texcoord[i]);
1641         }
1642         for (i = 0;i < backendunits;i++)
1643         {
1644                 R_Mesh_TexMatrix(i, &m->texmatrix[i]);
1645                 R_Mesh_TexCombine(i, m->texcombinergb[i], m->texcombinealpha[i], m->texrgbscale[i], m->texalphascale[i]);
1646         }
1647 }
1648
1649 void R_Mesh_Draw_ShowTris(int firstvertex, int numvertices, int numtriangles, const int *elements)
1650 {
1651         qglBegin(GL_LINES);
1652         for (;numtriangles;numtriangles--, elements += 3)
1653         {
1654                 qglArrayElement(elements[0]);qglArrayElement(elements[1]);
1655                 qglArrayElement(elements[1]);qglArrayElement(elements[2]);
1656                 qglArrayElement(elements[2]);qglArrayElement(elements[0]);
1657         }
1658         qglEnd();
1659         CHECKGLERROR
1660 }
1661
1662 /*
1663 ==============================================================================
1664
1665                                                 SCREEN SHOTS
1666
1667 ==============================================================================
1668 */
1669
1670 qboolean SCR_ScreenShot(char *filename, unsigned char *buffer1, unsigned char *buffer2, unsigned char *buffer3, int x, int y, int width, int height, qboolean flipx, qboolean flipy, qboolean flipdiagonal, qboolean jpeg, qboolean gammacorrect)
1671 {
1672         int     indices[3] = {0,1,2};
1673         qboolean ret;
1674
1675         if (!r_render.integer)
1676                 return false;
1677
1678         qglReadPixels (x, y, width, height, GL_RGB, GL_UNSIGNED_BYTE, buffer1);
1679         CHECKGLERROR
1680
1681         if (scr_screenshot_gamma.value != 1 && gammacorrect)
1682         {
1683                 int i;
1684                 double igamma = 1.0 / scr_screenshot_gamma.value;
1685                 unsigned char ramp[256];
1686                 for (i = 0;i < 256;i++)
1687                         ramp[i] = (unsigned char) (pow(i * (1.0 / 255.0), igamma) * 255.0);
1688                 for (i = 0;i < width*height*3;i++)
1689                         buffer1[i] = ramp[buffer1[i]];
1690         }
1691
1692         Image_CopyMux (buffer2, buffer1, width, height, flipx, flipy, flipdiagonal, 3, 3, indices);
1693
1694         if (jpeg)
1695                 ret = JPEG_SaveImage_preflipped (filename, width, height, buffer2);
1696         else
1697                 ret = Image_WriteTGARGB_preflipped (filename, width, height, buffer2, buffer3);
1698
1699         return ret;
1700 }
1701
1702 //=============================================================================
1703
1704 void R_ClearScreen(void)
1705 {
1706         if (r_render.integer)
1707         {
1708                 // clear to black
1709                 if (fogenabled)
1710                         qglClearColor(fogcolor[0],fogcolor[1],fogcolor[2],0);
1711                 else
1712                         qglClearColor(0,0,0,0);
1713                 CHECKGLERROR
1714                 qglClearDepth(1);CHECKGLERROR
1715                 if (gl_stencil)
1716                 {
1717                         // LordHavoc: we use a stencil centered around 128 instead of 0,
1718                         // to avoid clamping interfering with strange shadow volume
1719                         // drawing orders
1720                         qglClearStencil(128);CHECKGLERROR
1721                 }
1722                 // clear the screen
1723                 GL_Clear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | (gl_stencil ? GL_STENCIL_BUFFER_BIT : 0));
1724                 // set dithering mode
1725                 if (gl_dither.integer)
1726                 {
1727                         qglEnable(GL_DITHER);CHECKGLERROR
1728                 }
1729                 else
1730                 {
1731                         qglDisable(GL_DITHER);CHECKGLERROR
1732                 }
1733         }
1734 }
1735
1736 int r_stereo_side;
1737
1738 void SCR_DrawScreen (void)
1739 {
1740         for (r_showtrispass = 0;r_showtrispass <= (r_showtris.value > 0);r_showtrispass++)
1741         {
1742                 R_Mesh_Start();
1743
1744                 R_TimeReport("setup");
1745
1746                 if (r_showtrispass)
1747                 {
1748                         rmeshstate_t m;
1749                         r_showtrispass = 0;
1750                         GL_BlendFunc(GL_ONE, GL_ONE);
1751                         GL_DepthTest(GL_FALSE);
1752                         GL_DepthMask(GL_FALSE);
1753                         memset(&m, 0, sizeof(m));
1754                         R_Mesh_State(&m);
1755                         //qglEnable(GL_LINE_SMOOTH);
1756                         GL_ShowTrisColor(0.2,0.2,0.2,1);
1757                         r_showtrispass = 1;
1758                 }
1759
1760                 if (cls.signon == SIGNONS)
1761                 {
1762                         float size;
1763
1764                         size = scr_viewsize.value * (1.0 / 100.0);
1765                         size = min(size, 1);
1766
1767                         if (r_stereo_sidebyside.integer)
1768                         {
1769                                 r_refdef.width = vid.width * size / 2.5;
1770                                 r_refdef.height = vid.height * size / 2.5 * (1 - bound(0, r_letterbox.value, 100) / 100);
1771                                 r_refdef.x = (vid.width - r_refdef.width * 2.5) * 0.5;
1772                                 r_refdef.y = (vid.height - r_refdef.height)/2;
1773                                 if (r_stereo_side)
1774                                         r_refdef.x += r_refdef.width * 1.5;
1775                         }
1776                         else
1777                         {
1778                                 r_refdef.width = vid.width * size;
1779                                 r_refdef.height = vid.height * size * (1 - bound(0, r_letterbox.value, 100) / 100);
1780                                 r_refdef.x = (vid.width - r_refdef.width)/2;
1781                                 r_refdef.y = (vid.height - r_refdef.height)/2;
1782                         }
1783
1784                         // LordHavoc: viewzoom (zoom in for sniper rifles, etc)
1785                         // LordHavoc: this is designed to produce widescreen fov values
1786                         // when the screen is wider than 4/3 width/height aspect, to do
1787                         // this it simply assumes the requested fov is the vertical fov
1788                         // for a 4x3 display, if the ratio is not 4x3 this makes the fov
1789                         // higher/lower according to the ratio
1790                         r_refdef.frustum_y = tan(scr_fov.value * cl.viewzoom * M_PI / 360.0) * (3.0/4.0);
1791                         r_refdef.frustum_x = r_refdef.frustum_y * (float)r_refdef.width / (float)r_refdef.height / vid_pixelheight.value;
1792
1793                         r_refdef.frustum_x *= r_refdef.frustumscale_x;
1794                         r_refdef.frustum_y *= r_refdef.frustumscale_y;
1795
1796                         R_RenderView();
1797
1798                         if (scr_zoomwindow.integer)
1799                         {
1800                                 float sizex = bound(10, scr_zoomwindow_viewsizex.value, 100) / 100.0;
1801                                 float sizey = bound(10, scr_zoomwindow_viewsizey.value, 100) / 100.0;
1802                                 r_refdef.width = vid.width * sizex;
1803                                 r_refdef.height = vid.height * sizey;
1804                                 r_refdef.x = (vid.width - r_refdef.width)/2;
1805                                 r_refdef.y = 0;
1806
1807                                 r_refdef.frustum_y = tan(scr_zoomwindow_fov.value * cl.viewzoom * M_PI / 360.0) * (3.0/4.0);
1808                                 r_refdef.frustum_x = r_refdef.frustum_y * vid_pixelheight.value * (float)r_refdef.width / (float)r_refdef.height;
1809
1810                                 r_refdef.frustum_x *= r_refdef.frustumscale_x;
1811                                 r_refdef.frustum_y *= r_refdef.frustumscale_y;
1812
1813                                 R_RenderView();
1814                         }
1815                 }
1816
1817                 if (!r_stereo_sidebyside.integer)
1818                 {
1819                         r_refdef.width = vid.width;
1820                         r_refdef.height = vid.height;
1821                         r_refdef.x = 0;
1822                         r_refdef.y = 0;
1823                 }
1824
1825                 // draw 2D stuff
1826                 R_DrawQueue();
1827
1828                 R_Mesh_Finish();
1829
1830                 R_TimeReport("meshfinish");
1831         }
1832         r_showtrispass = 0;
1833         //qglDisable(GL_LINE_SMOOTH);
1834 }
1835
1836 void SCR_UpdateLoadingScreen (void)
1837 {
1838         float x, y;
1839         cachepic_t *pic;
1840         rmeshstate_t m;
1841         // don't do anything if not initialized yet
1842         if (vid_hidden)
1843                 return;
1844         r_showtrispass = 0;
1845         VID_UpdateGamma(false);
1846         qglViewport(0, 0, vid.width, vid.height);
1847         //qglDisable(GL_SCISSOR_TEST);
1848         //qglDepthMask(1);
1849         qglColorMask(1,1,1,1);
1850         //qglClearColor(0,0,0,0);
1851         //qglClear(GL_COLOR_BUFFER_BIT);
1852         //qglCullFace(GL_FRONT);
1853         //qglDisable(GL_CULL_FACE);
1854         //R_ClearScreen();
1855         R_Textures_Frame();
1856         GL_SetupView_Mode_Ortho(0, 0, vid_conwidth.integer, vid_conheight.integer, -10, 100);
1857         R_Mesh_Start();
1858         R_Mesh_Matrix(&r_identitymatrix);
1859         // draw the loading plaque
1860         pic = Draw_CachePic("gfx/loading", false);
1861         x = (vid_conwidth.integer - pic->width)/2;
1862         y = (vid_conheight.integer - pic->height)/2;
1863         GL_Color(1,1,1,1);
1864         GL_BlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
1865         GL_DepthTest(false);
1866         memset(&m, 0, sizeof(m));
1867         m.pointer_vertex = varray_vertex3f;
1868         m.pointer_texcoord[0] = varray_texcoord2f[0];
1869         m.tex[0] = R_GetTexture(pic->tex);
1870         R_Mesh_State(&m);
1871         varray_vertex3f[0] = varray_vertex3f[9] = x;
1872         varray_vertex3f[1] = varray_vertex3f[4] = y;
1873         varray_vertex3f[3] = varray_vertex3f[6] = x + pic->width;
1874         varray_vertex3f[7] = varray_vertex3f[10] = y + pic->height;
1875         varray_texcoord2f[0][0] = 0;varray_texcoord2f[0][1] = 0;
1876         varray_texcoord2f[0][2] = 1;varray_texcoord2f[0][3] = 0;
1877         varray_texcoord2f[0][4] = 1;varray_texcoord2f[0][5] = 1;
1878         varray_texcoord2f[0][6] = 0;varray_texcoord2f[0][7] = 1;
1879         GL_LockArrays(0, 4);
1880         R_Mesh_Draw(0, 4, 2, polygonelements);
1881         GL_LockArrays(0, 0);
1882         R_Mesh_Finish();
1883         // refresh
1884         VID_Finish();
1885 }
1886
1887 /*
1888 ==================
1889 SCR_UpdateScreen
1890
1891 This is called every frame, and can also be called explicitly to flush
1892 text to the screen.
1893 ==================
1894 */
1895 void SCR_UpdateScreen (void)
1896 {
1897         if (vid_hidden)
1898                 return;
1899
1900         if (r_textureunits.integer > gl_textureunits)
1901                 Cvar_SetValueQuick(&r_textureunits, gl_textureunits);
1902         if (r_textureunits.integer < 1)
1903                 Cvar_SetValueQuick(&r_textureunits, 1);
1904
1905         if (gl_combine.integer && !gl_combine_extension)
1906                 Cvar_SetValueQuick(&gl_combine, 0);
1907
1908         CHECKGLERROR
1909         qglViewport(0, 0, vid.width, vid.height);
1910         qglDisable(GL_SCISSOR_TEST);
1911         qglDepthMask(1);
1912         qglColorMask(1,1,1,1);
1913         qglClearColor(0,0,0,0);
1914         qglClear(GL_COLOR_BUFFER_BIT);
1915         CHECKGLERROR
1916
1917         R_TimeReport("clear");
1918
1919         if (r_stereo_redblue.integer || r_stereo_redgreen.integer || r_stereo_redcyan.integer || r_stereo_sidebyside.integer)
1920         {
1921                 matrix4x4_t originalmatrix = r_refdef.viewentitymatrix;
1922                 r_refdef.viewentitymatrix.m[0][3] = originalmatrix.m[0][3] + r_stereo_separation.value * -0.5f * r_refdef.viewentitymatrix.m[0][1];
1923                 r_refdef.viewentitymatrix.m[1][3] = originalmatrix.m[1][3] + r_stereo_separation.value * -0.5f * r_refdef.viewentitymatrix.m[1][1];
1924                 r_refdef.viewentitymatrix.m[2][3] = originalmatrix.m[2][3] + r_stereo_separation.value * -0.5f * r_refdef.viewentitymatrix.m[2][1];
1925
1926                 if (r_stereo_sidebyside.integer)
1927                         r_stereo_side = 0;
1928
1929                 if (r_stereo_redblue.integer || r_stereo_redgreen.integer || r_stereo_redcyan.integer)
1930                 {
1931                         r_refdef.colormask[0] = 1;
1932                         r_refdef.colormask[1] = 0;
1933                         r_refdef.colormask[2] = 0;
1934                 }
1935
1936                 SCR_DrawScreen();
1937
1938                 r_refdef.viewentitymatrix.m[0][3] = originalmatrix.m[0][3] + r_stereo_separation.value * 0.5f * r_refdef.viewentitymatrix.m[0][1];
1939                 r_refdef.viewentitymatrix.m[1][3] = originalmatrix.m[1][3] + r_stereo_separation.value * 0.5f * r_refdef.viewentitymatrix.m[1][1];
1940                 r_refdef.viewentitymatrix.m[2][3] = originalmatrix.m[2][3] + r_stereo_separation.value * 0.5f * r_refdef.viewentitymatrix.m[2][1];
1941
1942                 if (r_stereo_sidebyside.integer)
1943                         r_stereo_side = 1;
1944
1945                 if (r_stereo_redblue.integer || r_stereo_redgreen.integer || r_stereo_redcyan.integer)
1946                 {
1947                         r_refdef.colormask[0] = 0;
1948                         r_refdef.colormask[1] = r_stereo_redcyan.integer || r_stereo_redgreen.integer;
1949                         r_refdef.colormask[2] = r_stereo_redcyan.integer || r_stereo_redblue.integer;
1950                 }
1951
1952                 SCR_DrawScreen();
1953
1954                 r_refdef.viewentitymatrix = originalmatrix;
1955         }
1956         else
1957         {
1958                 r_showtrispass = false;
1959                 SCR_DrawScreen();
1960
1961                 if (r_showtris.value > 0)
1962                 {
1963                         rmeshstate_t m;
1964                         GL_BlendFunc(GL_ONE, GL_ONE);
1965                         GL_DepthTest(GL_FALSE);
1966                         GL_DepthMask(GL_FALSE);
1967                         memset(&m, 0, sizeof(m));
1968                         R_Mesh_State(&m);
1969                         r_showtrispass = true;
1970                         GL_ShowTrisColor(0.2,0.2,0.2,1);
1971                         SCR_DrawScreen();
1972                         r_showtrispass = false;
1973                 }
1974         }
1975
1976         VID_Finish();
1977         R_TimeReport("finish");
1978 }
1979
1980
1981 //===========================================================================
1982 // dynamic vertex array buffer subsystem
1983 //===========================================================================
1984
1985 // FIXME: someday this should be dynamically allocated and resized?
1986 float varray_vertex3f[65536*3];
1987 float varray_svector3f[65536*3];
1988 float varray_tvector3f[65536*3];
1989 float varray_normal3f[65536*3];
1990 float varray_color4f[65536*4];
1991 float varray_texcoord2f[4][65536*2];
1992 float varray_texcoord3f[4][65536*3];
1993 int earray_element3i[65536];
1994 float varray_vertex3f2[65536*3];
1995
1996 //===========================================================================
1997 // vertex array caching subsystem
1998 //===========================================================================
1999
2000 typedef struct rcachearraylink_s
2001 {
2002         struct rcachearraylink_s *next, *prev;
2003         struct rcachearrayitem_s *data;
2004 }
2005 rcachearraylink_t;
2006
2007 typedef struct rcachearrayitem_s
2008 {
2009         // the original request structure
2010         rcachearrayrequest_t request;
2011         // active
2012         int active;
2013         // offset into r_mesh_rcachedata
2014         int offset;
2015         // for linking this into the sequential list
2016         rcachearraylink_t sequentiallink;
2017         // for linking this into the lookup list
2018         rcachearraylink_t hashlink;
2019 }
2020 rcachearrayitem_t;
2021
2022 #define RCACHEARRAY_HASHSIZE 65536
2023 #define RCACHEARRAY_ITEMS 4096
2024 #define RCACHEARRAY_DEFAULTSIZE (4 << 20)
2025
2026 // all active items are linked into this chain in sorted order
2027 static rcachearraylink_t r_mesh_rcachesequentialchain;
2028 // all inactive items are linked into this chain in unknown order
2029 static rcachearraylink_t r_mesh_rcachefreechain;
2030 // all active items are also linked into these chains (using their hashlink)
2031 static rcachearraylink_t r_mesh_rcachechain[RCACHEARRAY_HASHSIZE];
2032
2033 // all items are stored here, whether active or inactive
2034 static rcachearrayitem_t r_mesh_rcacheitems[RCACHEARRAY_ITEMS];
2035
2036 // size of data buffer
2037 static int r_mesh_rcachedata_size = RCACHEARRAY_DEFAULTSIZE;
2038 // data buffer
2039 static unsigned char r_mesh_rcachedata[RCACHEARRAY_DEFAULTSIZE];
2040
2041 // current state
2042 static int r_mesh_rcachedata_offset;
2043 static rcachearraylink_t *r_mesh_rcachesequentialchain_current;
2044
2045 static void R_Mesh_CacheArray_Startup(void)
2046 {
2047         int i;
2048         rcachearraylink_t *l;
2049         // prepare all the linked lists
2050         l = &r_mesh_rcachesequentialchain;l->next = l->prev = l;l->data = NULL;
2051         l = &r_mesh_rcachefreechain;l->next = l->prev = l;l->data = NULL;
2052         memset(&r_mesh_rcachechain, 0, sizeof(r_mesh_rcachechain));
2053         for (i = 0;i < RCACHEARRAY_HASHSIZE;i++)
2054         {
2055                 l = &r_mesh_rcachechain[i];
2056                 l->next = l->prev = l;
2057                 l->data = NULL;
2058         }
2059         memset(&r_mesh_rcacheitems, 0, sizeof(r_mesh_rcacheitems));
2060         for (i = 0;i < RCACHEARRAY_ITEMS;i++)
2061         {
2062                 r_mesh_rcacheitems[i].hashlink.data = r_mesh_rcacheitems[i].sequentiallink.data = &r_mesh_rcacheitems[i];
2063                 l = &r_mesh_rcacheitems[i].sequentiallink;
2064                 l->next = &r_mesh_rcachefreechain;
2065                 l->prev = l->next->prev;
2066                 l->next->prev = l->prev->next = l;
2067         }
2068         // clear other state
2069         r_mesh_rcachedata_offset = 0;
2070         r_mesh_rcachesequentialchain_current = &r_mesh_rcachesequentialchain;
2071 }
2072
2073 static void R_Mesh_CacheArray_Shutdown(void)
2074 {
2075 }
2076
2077 /*
2078 static void R_Mesh_CacheArray_ValidateState(int num)
2079 {
2080         rcachearraylink_t *l, *lhead;
2081         lhead = &r_mesh_rcachesequentialchain;
2082         if (r_mesh_rcachesequentialchain_current == lhead)
2083                 return;
2084         for (l = lhead->next;l != lhead;l = l->next)
2085                 if (r_mesh_rcachesequentialchain_current == l)
2086                         return;
2087         Sys_Error("%i", num);
2088 }
2089 */
2090
2091 int R_Mesh_CacheArray(rcachearrayrequest_t *r)
2092 {
2093         rcachearraylink_t *l, *lhead, *lnext;
2094         rcachearrayitem_t *d;
2095         int hashindex, offset, offsetend;
2096
2097         //R_Mesh_CacheArray_ValidateState(3);
2098         // calculate a hashindex to choose a cache chain
2099         r->data = NULL;
2100         hashindex = CRC_Block((unsigned char *)r, sizeof(*r)) % RCACHEARRAY_HASHSIZE;
2101
2102         // is it already cached?
2103         for (lhead = &r_mesh_rcachechain[hashindex], l = lhead->next;l != lhead;l = l->next)
2104         {
2105                 if (!memcmp(&l->data->request, r, sizeof(l->data->request)))
2106                 {
2107                         // we have it cached already
2108                         r->data = r_mesh_rcachedata + l->data->offset;
2109                         return false;
2110                 }
2111         }
2112
2113         // we need to add a new cache item, this means finding a place for the new
2114         // data and making sure we have a free item available, lots of work...
2115
2116         // check if buffer needs to wrap
2117         if (r_mesh_rcachedata_offset + r->data_size > r_mesh_rcachedata_size)
2118         {
2119                 /*
2120                 if (r->data_size * 10 > r_mesh_rcachedata_size)
2121                 {
2122                         // realloc whole cache
2123                 }
2124                 */
2125                 // reset back to start
2126                 r_mesh_rcachedata_offset = 0;
2127                 r_mesh_rcachesequentialchain_current = &r_mesh_rcachesequentialchain;
2128         }
2129         offset = r_mesh_rcachedata_offset;
2130         r_mesh_rcachedata_offset += r->data_size;
2131         offsetend = r_mesh_rcachedata_offset;
2132         //R_Mesh_CacheArray_ValidateState(4);
2133
2134         /*
2135         {
2136                 int n;
2137                 for (lhead = &r_mesh_rcachesequentialchain, l = lhead->next, n = 0;l != lhead;l = l->next, n++);
2138                 Con_Printf("R_Mesh_CacheArray: new data range %i:%i, %i items are already linked\n", offset, offsetend, n);
2139         }
2140         */
2141
2142         // make room for the new data (remove old items)
2143         lhead = &r_mesh_rcachesequentialchain;
2144         l = r_mesh_rcachesequentialchain_current;
2145         if (l == lhead)
2146                 l = l->next;
2147         while (l != lhead && l->data->offset < offsetend && l->data->offset + l->data->request.data_size > offset)
2148         {
2149         //r_mesh_rcachesequentialchain_current = l;
2150         //R_Mesh_CacheArray_ValidateState(8);
2151                 lnext = l->next;
2152                 // if at the end of the chain, wrap around
2153                 if (lnext == lhead)
2154                         lnext = lnext->next;
2155         //r_mesh_rcachesequentialchain_current = lnext;
2156         //R_Mesh_CacheArray_ValidateState(10);
2157
2158                 // unlink from sequential chain
2159                 l->next->prev = l->prev;
2160                 l->prev->next = l->next;
2161         //R_Mesh_CacheArray_ValidateState(11);
2162                 // link into free chain
2163                 l->next = &r_mesh_rcachefreechain;
2164                 l->prev = l->next->prev;
2165                 l->next->prev = l->prev->next = l;
2166         //R_Mesh_CacheArray_ValidateState(12);
2167
2168                 l = &l->data->hashlink;
2169                 // unlink from hash chain
2170                 l->next->prev = l->prev;
2171                 l->prev->next = l->next;
2172
2173                 l = lnext;
2174         //r_mesh_rcachesequentialchain_current = l;
2175         //R_Mesh_CacheArray_ValidateState(9);
2176         }
2177         //r_mesh_rcachesequentialchain_current = l;
2178         //R_Mesh_CacheArray_ValidateState(5);
2179         // gobble an extra item if we have no free items available
2180         if (r_mesh_rcachefreechain.next == &r_mesh_rcachefreechain)
2181         {
2182                 lnext = l->next;
2183
2184                 // unlink from sequential chain
2185                 l->next->prev = l->prev;
2186                 l->prev->next = l->next;
2187                 // link into free chain
2188                 l->next = &r_mesh_rcachefreechain;
2189                 l->prev = l->next->prev;
2190                 l->next->prev = l->prev->next = l;
2191
2192                 l = &l->data->hashlink;
2193                 // unlink from hash chain
2194                 l->next->prev = l->prev;
2195                 l->prev->next = l->next;
2196
2197                 l = lnext;
2198         }
2199         r_mesh_rcachesequentialchain_current = l;
2200         //R_Mesh_CacheArray_ValidateState(6);
2201
2202         // now take an item from the free chain
2203         l = r_mesh_rcachefreechain.next;
2204         // set it up
2205         d = l->data;
2206         d->request = *r;
2207         d->offset = offset;
2208         // unlink
2209         l->next->prev = l->prev;
2210         l->prev->next = l->next;
2211         // relink to sequential
2212         l->next = r_mesh_rcachesequentialchain_current->prev;
2213         l->prev = l->next->prev;
2214         while (l->next->data && l->data && l->next->data->offset <= d->offset)
2215         {
2216                 //Con_Print(">\n");
2217                 l->next = l->next->next;
2218                 l->prev = l->prev->next;
2219         }
2220         while (l->prev->data && l->data && l->prev->data->offset >= d->offset)
2221         {
2222                 //Con_Print("<\n");
2223                 l->prev = l->prev->prev;
2224                 l->next = l->next->prev;
2225         }
2226         l->next->prev = l->prev->next = l;
2227         // also link into hash chain
2228         l = &l->data->hashlink;
2229         l->next = &r_mesh_rcachechain[hashindex];
2230         l->prev = l->next->prev;
2231         l->prev->next = l;
2232         l->next->prev = l->prev->next = l;
2233
2234
2235         //r_mesh_rcachesequentialchain_current = d->sequentiallink.next;
2236
2237         //R_Mesh_CacheArray_ValidateState(7);
2238         // and finally set the data pointer
2239         r->data = r_mesh_rcachedata + d->offset;
2240         // and tell the caller to fill the array
2241         return true;
2242 }
2243