gl_backend.c

   1
   2 #include "quakedef.h"
   3 #include "cl_collision.h"
   4
   5 cvar_t gl_mesh_drawrangeelements = {0, "gl_mesh_drawrangeelements", "1", "use glDrawRangeElements function if available instead of glDrawElements (for performance comparisons or bug testing)"};
   6 cvar_t gl_mesh_testarrayelement = {0, "gl_mesh_testarrayelement", "0", "use glBegin(GL_TRIANGLES);glArrayElement();glEnd(); primitives instead of glDrawElements (useful to test for driver bugs with glDrawElements)"};
   7 cvar_t gl_mesh_testmanualfeeding = {0, "gl_mesh_testmanualfeeding", "0", "use glBegin(GL_TRIANGLES);glTexCoord2f();glVertex3f();glEnd(); primitives instead of glDrawElements (useful to test for driver bugs with glDrawElements)"};
   8 cvar_t gl_paranoid = {0, "gl_paranoid", "0", "enables OpenGL error checking and other tests"};
   9 cvar_t gl_printcheckerror = {0, "gl_printcheckerror", "0", "prints all OpenGL error checks, useful to identify location of driver crashes"};
  10
  11 cvar_t r_render = {0, "r_render", "1", "enables rendering calls (you want this on!)"};
  12 cvar_t r_waterwarp = {CVAR_SAVE, "r_waterwarp", "1", "warp view while underwater"};
  13 cvar_t gl_polyblend = {CVAR_SAVE, "gl_polyblend", "1", "tints view while underwater, hurt, etc"};
  14 cvar_t gl_dither = {CVAR_SAVE, "gl_dither", "1", "enables OpenGL dithering (16bit looks bad with this off)"};
  15 cvar_t gl_lockarrays = {0, "gl_lockarrays", "1", "enables use of glLockArraysEXT, may cause glitches with some broken drivers"};
  16
  17 int gl_maxdrawrangeelementsvertices;
  18 int gl_maxdrawrangeelementsindices;
  19
  20 #ifdef DEBUGGL
  21 int errornumber = 0;
  22
  23 void GL_PrintError(int errornumber, char *filename, int linenumber)
  24 {
  25         switch(errornumber)
  26         {
  27 #ifdef GL_INVALID_ENUM
  28         case GL_INVALID_ENUM:
  29                 Con_Printf("GL_INVALID_ENUM at %s:%i\n", filename, linenumber);
  30                 break;
  31 #endif
  32 #ifdef GL_INVALID_VALUE
  33         case GL_INVALID_VALUE:
  34                 Con_Printf("GL_INVALID_VALUE at %s:%i\n", filename, linenumber);
  35                 break;
  36 #endif
  37 #ifdef GL_INVALID_OPERATION
  38         case GL_INVALID_OPERATION:
  39                 Con_Printf("GL_INVALID_OPERATION at %s:%i\n", filename, linenumber);
  40                 break;
  41 #endif
  42 #ifdef GL_STACK_OVERFLOW
  43         case GL_STACK_OVERFLOW:
  44                 Con_Printf("GL_STACK_OVERFLOW at %s:%i\n", filename, linenumber);
  45                 break;
  46 #endif
  47 #ifdef GL_STACK_UNDERFLOW
  48         case GL_STACK_UNDERFLOW:
  49                 Con_Printf("GL_STACK_UNDERFLOW at %s:%i\n", filename, linenumber);
  50                 break;
  51 #endif
  52 #ifdef GL_OUT_OF_MEMORY
  53         case GL_OUT_OF_MEMORY:
  54                 Con_Printf("GL_OUT_OF_MEMORY at %s:%i\n", filename, linenumber);
  55                 break;
  56 #endif
  57 #ifdef GL_TABLE_TOO_LARGE
  58         case GL_TABLE_TOO_LARGE:
  59                 Con_Printf("GL_TABLE_TOO_LARGE at %s:%i\n", filename, linenumber);
  60                 break;
  61 #endif
  62         default:
  63                 Con_Printf("GL UNKNOWN (%i) at %s:%i\n", errornumber, filename, linenumber);
  64                 break;
  65         }
  66 }
  67 #endif
  68
  69 #define BACKENDACTIVECHECK if (!backendactive) Sys_Error("GL backend function called when backend is not active");
  70
  71 void SCR_ScreenShot_f (void);
  72
  73 static matrix4x4_t backend_viewmatrix;
  74 static matrix4x4_t backend_modelmatrix;
  75 static matrix4x4_t backend_modelviewmatrix;
  76 static matrix4x4_t backend_glmodelviewmatrix;
  77 static matrix4x4_t backend_projectmatrix;
  78
  79 static unsigned int backendunits, backendimageunits, backendarrayunits, backendactive;
  80
  81 /*
  82 note: here's strip order for a terrain row:
  83 0--1--2--3--4
  84 |\ |\ |\ |\ |
  85 | \| \| \| \|
  86 A--B--C--D--E
  87 clockwise
  88
  89 A0B, 01B, B1C, 12C, C2D, 23D, D3E, 34E
  90
  91 *elements++ = i + row;
  92 *elements++ = i;
  93 *elements++ = i + row + 1;
  94 *elements++ = i;
  95 *elements++ = i + 1;
  96 *elements++ = i + row + 1;
  97
  98
  99 for (y = 0;y < rows - 1;y++)
 100 {
 101         for (x = 0;x < columns - 1;x++)
 102         {
 103                 i = y * rows + x;
 104                 *elements++ = i + columns;
 105                 *elements++ = i;
 106                 *elements++ = i + columns + 1;
 107                 *elements++ = i;
 108                 *elements++ = i + 1;
 109                 *elements++ = i + columns + 1;
 110         }
 111 }
 112
 113 alternative:
 114 0--1--2--3--4
 115 | /| /|\ | /|
 116 |/ |/ | \|/ |
 117 A--B--C--D--E
 118 counterclockwise
 119
 120 for (y = 0;y < rows - 1;y++)
 121 {
 122         for (x = 0;x < columns - 1;x++)
 123         {
 124                 i = y * rows + x;
 125                 *elements++ = i;
 126                 *elements++ = i + columns;
 127                 *elements++ = i + columns + 1;
 128                 *elements++ = i + columns;
 129                 *elements++ = i + columns + 1;
 130                 *elements++ = i + 1;
 131         }
 132 }
 133 */
 134
 135 int polygonelements[(POLYGONELEMENTS_MAXPOINTS-2)*3];
 136 int quadelements[QUADELEMENTS_MAXQUADS*6];
 137
 138 void GL_Backend_AllocArrays(void)
 139 {
 140 }
 141
 142 void GL_Backend_FreeArrays(void)
 143 {
 144 }
 145
 146 static void gl_backend_start(void)
 147 {
 148         Con_Print("OpenGL Backend starting...\n");
 149         CHECKGLERROR
 150
 151         if (qglDrawRangeElements != NULL)
 152         {
 153                 CHECKGLERROR
 154                 qglGetIntegerv(GL_MAX_ELEMENTS_VERTICES, &gl_maxdrawrangeelementsvertices);
 155                 CHECKGLERROR
 156                 qglGetIntegerv(GL_MAX_ELEMENTS_INDICES, &gl_maxdrawrangeelementsindices);
 157                 CHECKGLERROR
 158                 Con_Printf("glDrawRangeElements detected (max vertices %i, max indices %i)\n", gl_maxdrawrangeelementsvertices, gl_maxdrawrangeelementsindices);
 159         }
 160
 161         backendunits = min(MAX_TEXTUREUNITS, gl_textureunits);
 162         backendimageunits = backendunits;
 163         backendarrayunits = backendunits;
 164         if (gl_support_fragment_shader)
 165         {
 166                 CHECKGLERROR
 167                 qglGetIntegerv(GL_MAX_TEXTURE_IMAGE_UNITS_ARB, (int *)&backendimageunits);
 168                 CHECKGLERROR
 169                 qglGetIntegerv(GL_MAX_TEXTURE_COORDS_ARB, (int *)&backendarrayunits);
 170                 CHECKGLERROR
 171                 Con_Printf("GLSL shader support detected: texture units = %i texenv, %i image, %i array\n", backendunits, backendimageunits, backendarrayunits);
 172         }
 173         else if (backendunits > 1)
 174                 Con_Printf("multitexture detected: texture units = %i\n", backendunits);
 175         else
 176                 Con_Printf("singletexture\n");
 177
 178         GL_Backend_AllocArrays();
 179
 180         Con_Printf("OpenGL backend started.\n");
 181
 182         CHECKGLERROR
 183
 184         backendactive = true;
 185 }
 186
 187 static void gl_backend_shutdown(void)
 188 {
 189         backendunits = 0;
 190         backendimageunits = 0;
 191         backendarrayunits = 0;
 192         backendactive = false;
 193
 194         Con_Print("OpenGL Backend shutting down\n");
 195
 196         GL_Backend_FreeArrays();
 197 }
 198
 199 static void gl_backend_newmap(void)
 200 {
 201 }
 202
 203 void gl_backend_init(void)
 204 {
 205         int i;
 206
 207         for (i = 0;i < POLYGONELEMENTS_MAXPOINTS - 2;i++)
 208         {
 209                 polygonelements[i * 3 + 0] = 0;
 210                 polygonelements[i * 3 + 1] = i + 1;
 211                 polygonelements[i * 3 + 2] = i + 2;
 212         }
 213         // elements for rendering a series of quads as triangles
 214         for (i = 0;i < QUADELEMENTS_MAXQUADS;i++)
 215         {
 216                 quadelements[i * 6 + 0] = i * 4;
 217                 quadelements[i * 6 + 1] = i * 4 + 1;
 218                 quadelements[i * 6 + 2] = i * 4 + 2;
 219                 quadelements[i * 6 + 3] = i * 4;
 220                 quadelements[i * 6 + 4] = i * 4 + 2;
 221                 quadelements[i * 6 + 5] = i * 4 + 3;
 222         }
 223
 224         Cvar_RegisterVariable(&r_render);
 225         Cvar_RegisterVariable(&r_waterwarp);
 226         Cvar_RegisterVariable(&gl_polyblend);
 227         Cvar_RegisterVariable(&gl_dither);
 228         Cvar_RegisterVariable(&gl_lockarrays);
 229         Cvar_RegisterVariable(&gl_paranoid);
 230         Cvar_RegisterVariable(&gl_printcheckerror);
 231 #ifdef NORENDER
 232         Cvar_SetValue("r_render", 0);
 233 #endif
 234
 235         Cvar_RegisterVariable(&gl_mesh_drawrangeelements);
 236         Cvar_RegisterVariable(&gl_mesh_testarrayelement);
 237         Cvar_RegisterVariable(&gl_mesh_testmanualfeeding);
 238
 239         R_RegisterModule("GL_Backend", gl_backend_start, gl_backend_shutdown, gl_backend_newmap);
 240 }
 241
 242 void GL_SetupView_Orientation_Identity (void)
 243 {
 244         backend_viewmatrix = identitymatrix;
 245         memset(&backend_modelmatrix, 0, sizeof(backend_modelmatrix));
 246 }
 247
 248 void GL_SetupView_Orientation_FromEntity(matrix4x4_t *matrix)
 249 {
 250         matrix4x4_t tempmatrix, basematrix;
 251         Matrix4x4_Invert_Simple(&tempmatrix, matrix);
 252         Matrix4x4_CreateRotate(&basematrix, -90, 1, 0, 0);
 253         Matrix4x4_ConcatRotate(&basematrix, 90, 0, 0, 1);
 254         Matrix4x4_Concat(&backend_viewmatrix, &basematrix, &tempmatrix);
 255         //Matrix4x4_ConcatRotate(&backend_viewmatrix, -angles[2], 1, 0, 0);
 256         //Matrix4x4_ConcatRotate(&backend_viewmatrix, -angles[0], 0, 1, 0);
 257         //Matrix4x4_ConcatRotate(&backend_viewmatrix, -angles[1], 0, 0, 1);
 258         //Matrix4x4_ConcatTranslate(&backend_viewmatrix, -origin[0], -origin[1], -origin[2]);
 259         memset(&backend_modelmatrix, 0, sizeof(backend_modelmatrix));
 260 }
 261
 262 void GL_SetupView_Mode_Perspective (double frustumx, double frustumy, double zNear, double zFar)
 263 {
 264         double m[16];
 265
 266         // set up viewpoint
 267         CHECKGLERROR
 268         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 269         qglLoadIdentity();CHECKGLERROR
 270         // set view pyramid
 271         qglFrustum(-frustumx * zNear, frustumx * zNear, -frustumy * zNear, frustumy * zNear, zNear, zFar);CHECKGLERROR
 272         qglGetDoublev(GL_PROJECTION_MATRIX, m);CHECKGLERROR
 273         backend_projectmatrix.m[0][0] = m[0];
 274         backend_projectmatrix.m[1][0] = m[1];
 275         backend_projectmatrix.m[2][0] = m[2];
 276         backend_projectmatrix.m[3][0] = m[3];
 277         backend_projectmatrix.m[0][1] = m[4];
 278         backend_projectmatrix.m[1][1] = m[5];
 279         backend_projectmatrix.m[2][1] = m[6];
 280         backend_projectmatrix.m[3][1] = m[7];
 281         backend_projectmatrix.m[0][2] = m[8];
 282         backend_projectmatrix.m[1][2] = m[9];
 283         backend_projectmatrix.m[2][2] = m[10];
 284         backend_projectmatrix.m[3][2] = m[11];
 285         backend_projectmatrix.m[0][3] = m[12];
 286         backend_projectmatrix.m[1][3] = m[13];
 287         backend_projectmatrix.m[2][3] = m[14];
 288         backend_projectmatrix.m[3][3] = m[15];
 289         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 290         GL_SetupView_Orientation_Identity();
 291         CHECKGLERROR
 292 }
 293
 294 void GL_SetupView_Mode_PerspectiveInfiniteFarClip (double frustumx, double frustumy, double zNear)
 295 {
 296         double nudge, m[16];
 297
 298         // set up viewpoint
 299         CHECKGLERROR
 300         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 301         qglLoadIdentity();CHECKGLERROR
 302         // set view pyramid
 303         nudge = 1.0 - 1.0 / (1<<23);
 304         m[ 0] = 1.0 / frustumx;
 305         m[ 1] = 0;
 306         m[ 2] = 0;
 307         m[ 3] = 0;
 308         m[ 4] = 0;
 309         m[ 5] = 1.0 / frustumy;
 310         m[ 6] = 0;
 311         m[ 7] = 0;
 312         m[ 8] = 0;
 313         m[ 9] = 0;
 314         m[10] = -nudge;
 315         m[11] = -1;
 316         m[12] = 0;
 317         m[13] = 0;
 318         m[14] = -2 * zNear * nudge;
 319         m[15] = 0;
 320         qglLoadMatrixd(m);CHECKGLERROR
 321         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 322         GL_SetupView_Orientation_Identity();
 323         CHECKGLERROR
 324         backend_projectmatrix.m[0][0] = m[0];
 325         backend_projectmatrix.m[1][0] = m[1];
 326         backend_projectmatrix.m[2][0] = m[2];
 327         backend_projectmatrix.m[3][0] = m[3];
 328         backend_projectmatrix.m[0][1] = m[4];
 329         backend_projectmatrix.m[1][1] = m[5];
 330         backend_projectmatrix.m[2][1] = m[6];
 331         backend_projectmatrix.m[3][1] = m[7];
 332         backend_projectmatrix.m[0][2] = m[8];
 333         backend_projectmatrix.m[1][2] = m[9];
 334         backend_projectmatrix.m[2][2] = m[10];
 335         backend_projectmatrix.m[3][2] = m[11];
 336         backend_projectmatrix.m[0][3] = m[12];
 337         backend_projectmatrix.m[1][3] = m[13];
 338         backend_projectmatrix.m[2][3] = m[14];
 339         backend_projectmatrix.m[3][3] = m[15];
 340 }
 341
 342 void GL_SetupView_Mode_Ortho (double x1, double y1, double x2, double y2, double zNear, double zFar)
 343 {
 344         double m[16];
 345
 346         // set up viewpoint
 347         CHECKGLERROR
 348         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 349         qglLoadIdentity();CHECKGLERROR
 350         qglOrtho(x1, x2, y2, y1, zNear, zFar);CHECKGLERROR
 351         qglGetDoublev(GL_PROJECTION_MATRIX, m);CHECKGLERROR
 352         backend_projectmatrix.m[0][0] = m[0];
 353         backend_projectmatrix.m[1][0] = m[1];
 354         backend_projectmatrix.m[2][0] = m[2];
 355         backend_projectmatrix.m[3][0] = m[3];
 356         backend_projectmatrix.m[0][1] = m[4];
 357         backend_projectmatrix.m[1][1] = m[5];
 358         backend_projectmatrix.m[2][1] = m[6];
 359         backend_projectmatrix.m[3][1] = m[7];
 360         backend_projectmatrix.m[0][2] = m[8];
 361         backend_projectmatrix.m[1][2] = m[9];
 362         backend_projectmatrix.m[2][2] = m[10];
 363         backend_projectmatrix.m[3][2] = m[11];
 364         backend_projectmatrix.m[0][3] = m[12];
 365         backend_projectmatrix.m[1][3] = m[13];
 366         backend_projectmatrix.m[2][3] = m[14];
 367         backend_projectmatrix.m[3][3] = m[15];
 368         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 369         GL_SetupView_Orientation_Identity();
 370         CHECKGLERROR
 371 }
 372
 373 typedef struct gltextureunit_s
 374 {
 375         int t1d, t2d, t3d, tcubemap;
 376         int arrayenabled;
 377         unsigned int arraycomponents;
 378         const void *pointer_texcoord;
 379         int rgbscale, alphascale;
 380         int combinergb, combinealpha;
 381         // FIXME: add more combine stuff
 382         // texmatrixenabled exists only to avoid unnecessary texmatrix compares
 383         int texmatrixenabled;
 384         matrix4x4_t matrix;
 385 }
 386 gltextureunit_t;
 387
 388 static struct gl_state_s
 389 {
 390         int blendfunc1;
 391         int blendfunc2;
 392         int blend;
 393         GLboolean depthmask;
 394         int colormask; // stored as bottom 4 bits: r g b a (3 2 1 0 order)
 395         int depthtest;
 396         int alphatest;
 397         int scissortest;
 398         unsigned int unit;
 399         unsigned int clientunit;
 400         gltextureunit_t units[MAX_TEXTUREUNITS];
 401         float color4f[4];
 402         int lockrange_first;
 403         int lockrange_count;
 404         const void *pointer_vertex;
 405         const void *pointer_color;
 406 }
 407 gl_state;
 408
 409 void GL_SetupTextureState(void)
 410 {
 411         unsigned int i;
 412         gltextureunit_t *unit;
 413         CHECKGLERROR
 414         gl_state.unit = MAX_TEXTUREUNITS;
 415         gl_state.clientunit = MAX_TEXTUREUNITS;
 416         for (i = 0;i < MAX_TEXTUREUNITS;i++)
 417         {
 418                 unit = gl_state.units + i;
 419                 unit->t1d = 0;
 420                 unit->t2d = 0;
 421                 unit->t3d = 0;
 422                 unit->tcubemap = 0;
 423                 unit->arrayenabled = false;
 424                 unit->arraycomponents = 0;
 425                 unit->pointer_texcoord = NULL;
 426                 unit->rgbscale = 1;
 427                 unit->alphascale = 1;
 428                 unit->combinergb = GL_MODULATE;
 429                 unit->combinealpha = GL_MODULATE;
 430                 unit->texmatrixenabled = false;
 431                 unit->matrix = identitymatrix;
 432         }
 433
 434         for (i = 0;i < backendimageunits;i++)
 435         {
 436                 GL_ActiveTexture(i);
 437                 qglBindTexture(GL_TEXTURE_1D, 0);CHECKGLERROR
 438                 qglBindTexture(GL_TEXTURE_2D, 0);CHECKGLERROR
 439                 if (gl_texture3d)
 440                 {
 441                         qglBindTexture(GL_TEXTURE_3D, 0);CHECKGLERROR
 442                 }
 443                 if (gl_texturecubemap)
 444                 {
 445                         qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, 0);CHECKGLERROR
 446                 }
 447         }
 448
 449         for (i = 0;i < backendarrayunits;i++)
 450         {
 451                 GL_ClientActiveTexture(i);
 452                 qglTexCoordPointer(2, GL_FLOAT, sizeof(float[2]), NULL);CHECKGLERROR
 453                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 454         }
 455
 456         for (i = 0;i < backendunits;i++)
 457         {
 458                 GL_ActiveTexture(i);
 459                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 460                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 461                 if (gl_texture3d)
 462                 {
 463                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 464                 }
 465                 if (gl_texturecubemap)
 466                 {
 467                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 468                 }
 469                 qglMatrixMode(GL_TEXTURE);CHECKGLERROR
 470                 qglLoadIdentity();CHECKGLERROR
 471                 qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 472                 if (gl_combine.integer)
 473                 {
 474                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);CHECKGLERROR
 475                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_MODULATE);CHECKGLERROR
 476                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE);CHECKGLERROR
 477                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 478                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_RGB_ARB, GL_TEXTURE);CHECKGLERROR // for GL_INTERPOLATE_ARB mode
 479                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 480                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 481                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_RGB_ARB, GL_SRC_ALPHA);CHECKGLERROR
 482                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, GL_MODULATE);CHECKGLERROR
 483                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA_ARB, GL_TEXTURE);CHECKGLERROR
 484                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_ALPHA_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 485                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_ALPHA_ARB, GL_CONSTANT_ARB);CHECKGLERROR
 486                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 487                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 488                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 489                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
 490                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
 491                 }
 492                 else
 493                 {
 494                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 495                 }
 496                 CHECKGLERROR
 497         }
 498         CHECKGLERROR
 499 }
 500
 501 void GL_Backend_ResetState(void)
 502 {
 503         memset(&gl_state, 0, sizeof(gl_state));
 504         gl_state.depthtest = true;
 505         gl_state.alphatest = false;
 506         gl_state.blendfunc1 = GL_ONE;
 507         gl_state.blendfunc2 = GL_ZERO;
 508         gl_state.blend = false;
 509         gl_state.depthmask = GL_TRUE;
 510         gl_state.colormask = 15;
 511         gl_state.color4f[0] = gl_state.color4f[1] = gl_state.color4f[2] = gl_state.color4f[3] = 1;
 512         gl_state.lockrange_first = 0;
 513         gl_state.lockrange_count = 0;
 514         gl_state.pointer_vertex = NULL;
 515         gl_state.pointer_color = NULL;
 516
 517         CHECKGLERROR
 518
 519         qglColorMask(1, 1, 1, 1);
 520         qglAlphaFunc(GL_GEQUAL, 0.5);CHECKGLERROR
 521         qglDisable(GL_ALPHA_TEST);CHECKGLERROR
 522         qglBlendFunc(gl_state.blendfunc1, gl_state.blendfunc2);CHECKGLERROR
 523         qglDisable(GL_BLEND);CHECKGLERROR
 524         qglCullFace(GL_FRONT);CHECKGLERROR
 525         qglEnable(GL_CULL_FACE);CHECKGLERROR
 526         qglDepthFunc(GL_LEQUAL);CHECKGLERROR
 527         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 528         qglDepthMask(gl_state.depthmask);CHECKGLERROR
 529
 530         qglVertexPointer(3, GL_FLOAT, sizeof(float[3]), NULL);CHECKGLERROR
 531         qglEnableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 532
 533         qglColorPointer(4, GL_FLOAT, sizeof(float[4]), NULL);CHECKGLERROR
 534         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 535
 536         GL_Color(0, 0, 0, 0);
 537         GL_Color(1, 1, 1, 1);
 538
 539         GL_SetupTextureState();
 540 }
 541
 542 void GL_ActiveTexture(unsigned int num)
 543 {
 544         if (gl_state.unit != num)
 545         {
 546                 gl_state.unit = num;
 547                 if (qglActiveTexture)
 548                 {
 549                         CHECKGLERROR
 550                         qglActiveTexture(GL_TEXTURE0_ARB + gl_state.unit);
 551                         CHECKGLERROR
 552                 }
 553         }
 554 }
 555
 556 void GL_ClientActiveTexture(unsigned int num)
 557 {
 558         if (gl_state.clientunit != num)
 559         {
 560                 gl_state.clientunit = num;
 561                 if (qglActiveTexture)
 562                 {
 563                         CHECKGLERROR
 564                         qglClientActiveTexture(GL_TEXTURE0_ARB + gl_state.clientunit);
 565                         CHECKGLERROR
 566                 }
 567         }
 568 }
 569
 570 void GL_BlendFunc(int blendfunc1, int blendfunc2)
 571 {
 572         if (gl_state.blendfunc1 != blendfunc1 || gl_state.blendfunc2 != blendfunc2)
 573         {
 574                 CHECKGLERROR
 575                 qglBlendFunc(gl_state.blendfunc1 = blendfunc1, gl_state.blendfunc2 = blendfunc2);CHECKGLERROR
 576                 if (gl_state.blendfunc2 == GL_ZERO)
 577                 {
 578                         if (gl_state.blendfunc1 == GL_ONE)
 579                         {
 580                                 if (gl_state.blend)
 581                                 {
 582                                         gl_state.blend = 0;
 583                                         qglDisable(GL_BLEND);CHECKGLERROR
 584                                 }
 585                         }
 586                         else
 587                         {
 588                                 if (!gl_state.blend)
 589                                 {
 590                                         gl_state.blend = 1;
 591                                         qglEnable(GL_BLEND);CHECKGLERROR
 592                                 }
 593                         }
 594                 }
 595                 else
 596                 {
 597                         if (!gl_state.blend)
 598                         {
 599                                 gl_state.blend = 1;
 600                                 qglEnable(GL_BLEND);CHECKGLERROR
 601                         }
 602                 }
 603         }
 604 }
 605
 606 void GL_DepthMask(int state)
 607 {
 608         if (gl_state.depthmask != state)
 609         {
 610                 CHECKGLERROR
 611                 qglDepthMask(gl_state.depthmask = state);CHECKGLERROR
 612         }
 613 }
 614
 615 void GL_DepthTest(int state)
 616 {
 617         if (gl_state.depthtest != state)
 618         {
 619                 gl_state.depthtest = state;
 620                 CHECKGLERROR
 621                 if (gl_state.depthtest)
 622                 {
 623                         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 624                 }
 625                 else
 626                 {
 627                         qglDisable(GL_DEPTH_TEST);CHECKGLERROR
 628                 }
 629         }
 630 }
 631
 632 void GL_AlphaTest(int state)
 633 {
 634         if (gl_state.alphatest != state)
 635         {
 636                 gl_state.alphatest = state;
 637                 CHECKGLERROR
 638                 if (gl_state.alphatest)
 639                 {
 640                         qglEnable(GL_ALPHA_TEST);CHECKGLERROR
 641                 }
 642                 else
 643                 {
 644                         qglDisable(GL_ALPHA_TEST);CHECKGLERROR
 645                 }
 646         }
 647 }
 648
 649 void GL_ColorMask(int r, int g, int b, int a)
 650 {
 651         int state = r*8 + g*4 + b*2 + a*1;
 652         if (gl_state.colormask != state)
 653         {
 654                 gl_state.colormask = state;
 655                 CHECKGLERROR
 656                 qglColorMask((GLboolean)r, (GLboolean)g, (GLboolean)b, (GLboolean)a);CHECKGLERROR
 657         }
 658 }
 659
 660 void GL_Color(float cr, float cg, float cb, float ca)
 661 {
 662         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)
 663         {
 664                 gl_state.color4f[0] = cr;
 665                 gl_state.color4f[1] = cg;
 666                 gl_state.color4f[2] = cb;
 667                 gl_state.color4f[3] = ca;
 668                 CHECKGLERROR
 669                 qglColor4f(gl_state.color4f[0], gl_state.color4f[1], gl_state.color4f[2], gl_state.color4f[3]);
 670                 CHECKGLERROR
 671         }
 672 }
 673
 674 void GL_LockArrays(int first, int count)
 675 {
 676         if (gl_state.lockrange_count != count || gl_state.lockrange_first != first)
 677         {
 678                 if (gl_state.lockrange_count)
 679                 {
 680                         gl_state.lockrange_count = 0;
 681                         CHECKGLERROR
 682                         qglUnlockArraysEXT();
 683                         CHECKGLERROR
 684                 }
 685                 if (count && gl_supportslockarrays && gl_lockarrays.integer && r_render.integer)
 686                 {
 687                         gl_state.lockrange_first = first;
 688                         gl_state.lockrange_count = count;
 689                         CHECKGLERROR
 690                         qglLockArraysEXT(first, count);
 691                         CHECKGLERROR
 692                 }
 693         }
 694 }
 695
 696 void GL_Scissor (int x, int y, int width, int height)
 697 {
 698         CHECKGLERROR
 699         qglScissor(x, vid.height - (y + height),width,height);
 700         CHECKGLERROR
 701 }
 702
 703 void GL_ScissorTest(int state)
 704 {
 705         if(gl_state.scissortest == state)
 706                 return;
 707
 708         CHECKGLERROR
 709         if((gl_state.scissortest = state))
 710                 qglEnable(GL_SCISSOR_TEST);
 711         else
 712                 qglDisable(GL_SCISSOR_TEST);
 713         CHECKGLERROR
 714 }
 715
 716 void GL_Clear(int mask)
 717 {
 718         CHECKGLERROR
 719         qglClear(mask);CHECKGLERROR
 720 }
 721
 722 void GL_TransformToScreen(const vec4_t in, vec4_t out)
 723 {
 724         vec4_t temp;
 725         float iw;
 726         Matrix4x4_Transform4 (&backend_viewmatrix, in, temp);
 727         Matrix4x4_Transform4 (&backend_projectmatrix, temp, out);
 728         iw = 1.0f / out[3];
 729         out[0] = r_view.x + (out[0] * iw + 1.0f) * r_view.width * 0.5f;
 730         out[1] = r_view.y + (out[1] * iw + 1.0f) * r_view.height * 0.5f;
 731         out[2] = r_view.z + (out[2] * iw + 1.0f) * r_view.depth * 0.5f;
 732 }
 733
 734 // called at beginning of frame
 735 void R_Mesh_Start(void)
 736 {
 737         BACKENDACTIVECHECK
 738         CHECKGLERROR
 739         if (gl_printcheckerror.integer && !gl_paranoid.integer)
 740         {
 741                 Con_Printf("WARNING: gl_printcheckerror is on but gl_paranoid is off, turning it on...\n");
 742                 Cvar_SetValueQuick(&gl_paranoid, 1);
 743         }
 744         GL_Backend_ResetState();
 745 }
 746
 747 unsigned int GL_Backend_CompileProgram(int vertexstrings_count, const char **vertexstrings_list, int fragmentstrings_count, const char **fragmentstrings_list)
 748 {
 749         GLint vertexshadercompiled, fragmentshadercompiled, programlinked;
 750         GLuint vertexshaderobject, fragmentshaderobject, programobject = 0;
 751         char compilelog[MAX_INPUTLINE];
 752         CHECKGLERROR
 753
 754         programobject = qglCreateProgramObjectARB();CHECKGLERROR
 755         if (!programobject)
 756                 return 0;
 757
 758         if (developer.integer >= 100)
 759         {
 760                 int i;
 761                 Con_Printf("Compiling shader:\n");
 762                 if (vertexstrings_count)
 763                 {
 764                         Con_Printf("------ VERTEX SHADER ------\n");
 765                         for (i = 0;i < vertexstrings_count;i++)
 766                                 Con_Print(vertexstrings_list[i]);
 767                         Con_Print("\n");
 768                 }
 769                 if (fragmentstrings_count)
 770                 {
 771                         Con_Printf("------ FRAGMENT SHADER ------\n");
 772                         for (i = 0;i < fragmentstrings_count;i++)
 773                                 Con_Print(fragmentstrings_list[i]);
 774                         Con_Print("\n");
 775                 }
 776         }
 777
 778         if (vertexstrings_count)
 779         {
 780                 vertexshaderobject = qglCreateShaderObjectARB(GL_VERTEX_SHADER_ARB);CHECKGLERROR
 781                 if (!vertexshaderobject)
 782                 {
 783                         qglDeleteObjectARB(programobject);
 784                         CHECKGLERROR
 785                         return 0;
 786                 }
 787                 qglShaderSourceARB(vertexshaderobject, vertexstrings_count, vertexstrings_list, NULL);CHECKGLERROR
 788                 qglCompileShaderARB(vertexshaderobject);CHECKGLERROR
 789                 qglGetObjectParameterivARB(vertexshaderobject, GL_OBJECT_COMPILE_STATUS_ARB, &vertexshadercompiled);CHECKGLERROR
 790                 qglGetInfoLogARB(vertexshaderobject, sizeof(compilelog), NULL, compilelog);CHECKGLERROR
 791                 if (compilelog[0])
 792                         Con_DPrintf("vertex shader compile log:\n%s\n", compilelog);
 793                 if (!vertexshadercompiled)
 794                 {
 795                         qglDeleteObjectARB(programobject);CHECKGLERROR
 796                         qglDeleteObjectARB(vertexshaderobject);CHECKGLERROR
 797                         return 0;
 798                 }
 799                 qglAttachObjectARB(programobject, vertexshaderobject);CHECKGLERROR
 800                 qglDeleteObjectARB(vertexshaderobject);CHECKGLERROR
 801         }
 802
 803         if (fragmentstrings_count)
 804         {
 805                 fragmentshaderobject = qglCreateShaderObjectARB(GL_FRAGMENT_SHADER_ARB);CHECKGLERROR
 806                 if (!fragmentshaderobject)
 807                 {
 808                         qglDeleteObjectARB(programobject);CHECKGLERROR
 809                         return 0;
 810                 }
 811                 qglShaderSourceARB(fragmentshaderobject, fragmentstrings_count, fragmentstrings_list, NULL);CHECKGLERROR
 812                 qglCompileShaderARB(fragmentshaderobject);CHECKGLERROR
 813                 qglGetObjectParameterivARB(fragmentshaderobject, GL_OBJECT_COMPILE_STATUS_ARB, &fragmentshadercompiled);CHECKGLERROR
 814                 qglGetInfoLogARB(fragmentshaderobject, sizeof(compilelog), NULL, compilelog);CHECKGLERROR
 815                 if (compilelog[0])
 816                         Con_DPrintf("fragment shader compile log:\n%s\n", compilelog);
 817                 if (!fragmentshadercompiled)
 818                 {
 819                         qglDeleteObjectARB(programobject);CHECKGLERROR
 820                         qglDeleteObjectARB(fragmentshaderobject);CHECKGLERROR
 821                         return 0;
 822                 }
 823                 qglAttachObjectARB(programobject, fragmentshaderobject);CHECKGLERROR
 824                 qglDeleteObjectARB(fragmentshaderobject);CHECKGLERROR
 825         }
 826
 827         qglLinkProgramARB(programobject);CHECKGLERROR
 828         qglGetObjectParameterivARB(programobject, GL_OBJECT_LINK_STATUS_ARB, &programlinked);CHECKGLERROR
 829         qglGetInfoLogARB(programobject, sizeof(compilelog), NULL, compilelog);CHECKGLERROR
 830         if (compilelog[0])
 831         {
 832                 Con_DPrintf("program link log:\n%s\n", compilelog);
 833                 // software vertex shader is ok but software fragment shader is WAY
 834                 // too slow, fail program if so.
 835                 // NOTE: this string might be ATI specific, but that's ok because the
 836                 // ATI R300 chip (Radeon 9500-9800/X300) is the most likely to use a
 837                 // software fragment shader due to low instruction and dependent
 838                 // texture limits.
 839                 if (strstr(compilelog, "fragment shader will run in software"))
 840                         programlinked = false;
 841         }
 842         if (!programlinked)
 843         {
 844                 qglDeleteObjectARB(programobject);CHECKGLERROR
 845                 return 0;
 846         }
 847         CHECKGLERROR
 848         return programobject;
 849 }
 850
 851 void GL_Backend_FreeProgram(unsigned int prog)
 852 {
 853         CHECKGLERROR
 854         qglDeleteObjectARB(prog);
 855         CHECKGLERROR
 856 }
 857
 858 int gl_backend_rebindtextures;
 859
 860 void GL_Backend_RenumberElements(int *out, int count, const int *in, int offset)
 861 {
 862         int i;
 863         if (offset)
 864         {
 865                 for (i = 0;i < count;i++)
 866                         *out++ = *in++ + offset;
 867         }
 868         else
 869                 memcpy(out, in, sizeof(*out) * count);
 870 }
 871
 872 // renders triangles using vertices from the active arrays
 873 int paranoidblah = 0;
 874 void R_Mesh_Draw(int firstvertex, int numvertices, int numtriangles, const int *elements)
 875 {
 876         unsigned int numelements = numtriangles * 3;
 877         if (numvertices < 3 || numtriangles < 1)
 878         {
 879                 Con_Printf("R_Mesh_Draw(%d, %d, %d, %08p);\n", firstvertex, numvertices, numtriangles, elements);
 880                 return;
 881         }
 882         CHECKGLERROR
 883         r_refdef.stats.meshes++;
 884         r_refdef.stats.meshes_elements += numelements;
 885         if (gl_paranoid.integer)
 886         {
 887                 unsigned int i, j, size;
 888                 const int *p;
 889                 if (!qglIsEnabled(GL_VERTEX_ARRAY))
 890                         Con_Print("R_Mesh_Draw: vertex array not enabled\n");
 891                 CHECKGLERROR
 892                 for (j = 0, size = numvertices * 3, p = (int *)((float *)gl_state.pointer_vertex + firstvertex * 3);j < size;j++, p++)
 893                         paranoidblah += *p;
 894                 if (gl_state.pointer_color)
 895                 {
 896                         if (!qglIsEnabled(GL_COLOR_ARRAY))
 897                                 Con_Print("R_Mesh_Draw: color array set but not enabled\n");
 898                         CHECKGLERROR
 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                                 CHECKGLERROR
 910                                 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++)
 911                                         paranoidblah += *p;
 912                         }
 913                 }
 914                 for (i = 0;i < (unsigned int) numtriangles * 3;i++)
 915                 {
 916                         if (elements[i] < firstvertex || elements[i] >= firstvertex + numvertices)
 917                         {
 918                                 Con_Printf("R_Mesh_Draw: invalid vertex index %i (outside range %i - %i) in elements list\n", elements[i], firstvertex, firstvertex + numvertices);
 919                                 return;
 920                         }
 921                 }
 922                 CHECKGLERROR
 923         }
 924         if (r_render.integer)
 925         {
 926                 CHECKGLERROR
 927                 if (gl_mesh_testmanualfeeding.integer)
 928                 {
 929                         unsigned int i, j;
 930                         const GLfloat *p;
 931                         qglBegin(GL_TRIANGLES);
 932                         for (i = 0;i < (unsigned int) numtriangles * 3;i++)
 933                         {
 934                                 for (j = 0;j < backendarrayunits;j++)
 935                                 {
 936                                         if (gl_state.units[j].pointer_texcoord)
 937                                         {
 938                                                 if (backendarrayunits > 1)
 939                                                 {
 940                                                         if (gl_state.units[j].arraycomponents == 4)
 941                                                         {
 942                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 4;
 943                                                                 qglMultiTexCoord4f(GL_TEXTURE0_ARB + j, p[0], p[1], p[2], p[3]);
 944                                                         }
 945                                                         else if (gl_state.units[j].arraycomponents == 3)
 946                                                         {
 947                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 3;
 948                                                                 qglMultiTexCoord3f(GL_TEXTURE0_ARB + j, p[0], p[1], p[2]);
 949                                                         }
 950                                                         else if (gl_state.units[j].arraycomponents == 2)
 951                                                         {
 952                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 2;
 953                                                                 qglMultiTexCoord2f(GL_TEXTURE0_ARB + j, p[0], p[1]);
 954                                                         }
 955                                                         else
 956                                                         {
 957                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 1;
 958                                                                 qglMultiTexCoord1f(GL_TEXTURE0_ARB + j, p[0]);
 959                                                         }
 960                                                 }
 961                                                 else
 962                                                 {
 963                                                         if (gl_state.units[j].arraycomponents == 4)
 964                                                         {
 965                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 4;
 966                                                                 qglTexCoord4f(p[0], p[1], p[2], p[3]);
 967                                                         }
 968                                                         else if (gl_state.units[j].arraycomponents == 3)
 969                                                         {
 970                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 3;
 971                                                                 qglTexCoord3f(p[0], p[1], p[2]);
 972                                                         }
 973                                                         else if (gl_state.units[j].arraycomponents == 2)
 974                                                         {
 975                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 2;
 976                                                                 qglTexCoord2f(p[0], p[1]);
 977                                                         }
 978                                                         else
 979                                                         {
 980                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 1;
 981                                                                 qglTexCoord1f(p[0]);
 982                                                         }
 983                                                 }
 984                                         }
 985                                 }
 986                                 if (gl_state.pointer_color)
 987                                 {
 988                                         p = ((const GLfloat *)(gl_state.pointer_color)) + elements[i] * 4;
 989                                         qglColor4f(p[0], p[1], p[2], p[3]);
 990                                 }
 991                                 p = ((const GLfloat *)(gl_state.pointer_vertex)) + elements[i] * 3;
 992                                 qglVertex3f(p[0], p[1], p[2]);
 993                         }
 994                         qglEnd();
 995                         CHECKGLERROR
 996                 }
 997                 else if (gl_mesh_testarrayelement.integer)
 998                 {
 999                         int i;
1000                         qglBegin(GL_TRIANGLES);
1001                         for (i = 0;i < numtriangles * 3;i++)
1002                         {
1003                                 qglArrayElement(elements[i]);
1004                         }
1005                         qglEnd();
1006                         CHECKGLERROR
1007                 }
1008                 else if (gl_mesh_drawrangeelements.integer && qglDrawRangeElements != NULL)
1009                 {
1010                         qglDrawRangeElements(GL_TRIANGLES, firstvertex, firstvertex + numvertices, numelements, GL_UNSIGNED_INT, elements);
1011                         CHECKGLERROR
1012                 }
1013                 else
1014                 {
1015                         qglDrawElements(GL_TRIANGLES, numelements, GL_UNSIGNED_INT, elements);
1016                         CHECKGLERROR
1017                 }
1018         }
1019 }
1020
1021 // restores backend state, used when done with 3D rendering
1022 void R_Mesh_Finish(void)
1023 {
1024         unsigned int i;
1025         BACKENDACTIVECHECK
1026         CHECKGLERROR
1027         GL_LockArrays(0, 0);
1028         CHECKGLERROR
1029
1030         for (i = 0;i < backendimageunits;i++)
1031         {
1032                 GL_ActiveTexture(i);
1033                 qglBindTexture(GL_TEXTURE_1D, 0);CHECKGLERROR
1034                 qglBindTexture(GL_TEXTURE_2D, 0);CHECKGLERROR
1035                 if (gl_texture3d)
1036                 {
1037                         qglBindTexture(GL_TEXTURE_3D, 0);CHECKGLERROR
1038                 }
1039                 if (gl_texturecubemap)
1040                 {
1041                         qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, 0);CHECKGLERROR
1042                 }
1043         }
1044         for (i = 0;i < backendarrayunits;i++)
1045         {
1046                 GL_ActiveTexture(backendarrayunits - 1 - i);
1047                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
1048         }
1049         for (i = 0;i < backendunits;i++)
1050         {
1051                 GL_ActiveTexture(backendunits - 1 - i);
1052                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
1053                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
1054                 if (gl_texture3d)
1055                 {
1056                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
1057                 }
1058                 if (gl_texturecubemap)
1059                 {
1060                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
1061                 }
1062                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
1063                 if (gl_combine.integer)
1064                 {
1065                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
1066                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
1067                 }
1068         }
1069         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
1070         qglDisableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
1071
1072         qglDisable(GL_BLEND);CHECKGLERROR
1073         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
1074         qglDepthMask(GL_TRUE);CHECKGLERROR
1075         qglBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);CHECKGLERROR
1076 }
1077
1078 void R_Mesh_Matrix(const matrix4x4_t *matrix)
1079 {
1080         if (memcmp(matrix, &backend_modelmatrix, sizeof(matrix4x4_t)))
1081         {
1082                 backend_modelmatrix = *matrix;
1083                 Matrix4x4_Concat(&backend_modelviewmatrix, &backend_viewmatrix, matrix);
1084                 Matrix4x4_Transpose(&backend_glmodelviewmatrix, &backend_modelviewmatrix);
1085                 CHECKGLERROR
1086                 qglLoadMatrixf(&backend_glmodelviewmatrix.m[0][0]);CHECKGLERROR
1087         }
1088 }
1089
1090 void R_Mesh_VertexPointer(const float *vertex3f)
1091 {
1092         if (gl_state.pointer_vertex != vertex3f)
1093         {
1094                 gl_state.pointer_vertex = vertex3f;
1095                 CHECKGLERROR
1096                 qglVertexPointer(3, GL_FLOAT, sizeof(float[3]), gl_state.pointer_vertex);
1097                 CHECKGLERROR
1098         }
1099 }
1100
1101 void R_Mesh_ColorPointer(const float *color4f)
1102 {
1103         if (gl_state.pointer_color != color4f)
1104         {
1105                 CHECKGLERROR
1106                 if (!gl_state.pointer_color)
1107                 {
1108                         qglEnableClientState(GL_COLOR_ARRAY);CHECKGLERROR
1109                 }
1110                 else if (!color4f)
1111                 {
1112                         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
1113                         // when color array is on the glColor gets trashed, set it again
1114                         qglColor4f(gl_state.color4f[0], gl_state.color4f[1], gl_state.color4f[2], gl_state.color4f[3]);CHECKGLERROR
1115                 }
1116                 gl_state.pointer_color = color4f;
1117                 qglColorPointer(4, GL_FLOAT, sizeof(float[4]), gl_state.pointer_color);CHECKGLERROR
1118         }
1119 }
1120
1121 void R_Mesh_TexCoordPointer(unsigned int unitnum, unsigned int numcomponents, const float *texcoord)
1122 {
1123         gltextureunit_t *unit = gl_state.units + unitnum;
1124         // update array settings
1125         CHECKGLERROR
1126         if (texcoord)
1127         {
1128                 // texcoord array
1129                 if (unit->pointer_texcoord != texcoord || unit->arraycomponents != numcomponents)
1130                 {
1131                         unit->pointer_texcoord = texcoord;
1132                         unit->arraycomponents = numcomponents;
1133                         GL_ClientActiveTexture(unitnum);
1134                         qglTexCoordPointer(unit->arraycomponents, GL_FLOAT, sizeof(float) * unit->arraycomponents, unit->pointer_texcoord);CHECKGLERROR
1135                 }
1136                 // texture array unit is enabled, enable the array
1137                 if (!unit->arrayenabled)
1138                 {
1139                         unit->arrayenabled = true;
1140                         GL_ClientActiveTexture(unitnum);
1141                         qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
1142                 }
1143         }
1144         else
1145         {
1146                 // texture array unit is disabled, disable the array
1147                 if (unit->arrayenabled)
1148                 {
1149                         unit->arrayenabled = false;
1150                         GL_ClientActiveTexture(unitnum);
1151                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
1152                 }
1153         }
1154 }
1155
1156 void R_Mesh_TexBindAll(unsigned int unitnum, int tex1d, int tex2d, int tex3d, int texcubemap)
1157 {
1158         gltextureunit_t *unit = gl_state.units + unitnum;
1159         if (unitnum >= backendimageunits)
1160                 return;
1161         // update 1d texture binding
1162         if (unit->t1d != tex1d)
1163         {
1164                 GL_ActiveTexture(unitnum);
1165                 if (unitnum < backendunits)
1166                 {
1167                         if (tex1d)
1168                         {
1169                                 if (unit->t1d == 0)
1170                                 {
1171                                         qglEnable(GL_TEXTURE_1D);CHECKGLERROR
1172                                 }
1173                         }
1174                         else
1175                         {
1176                                 if (unit->t1d)
1177                                 {
1178                                         qglDisable(GL_TEXTURE_1D);CHECKGLERROR
1179                                 }
1180                         }
1181                 }
1182                 unit->t1d = tex1d;
1183                 qglBindTexture(GL_TEXTURE_1D, unit->t1d);CHECKGLERROR
1184         }
1185         // update 2d texture binding
1186         if (unit->t2d != tex2d)
1187         {
1188                 GL_ActiveTexture(unitnum);
1189                 if (unitnum < backendunits)
1190                 {
1191                         if (tex2d)
1192                         {
1193                                 if (unit->t2d == 0)
1194                                 {
1195                                         qglEnable(GL_TEXTURE_2D);CHECKGLERROR
1196                                 }
1197                         }
1198                         else
1199                         {
1200                                 if (unit->t2d)
1201                                 {
1202                                         qglDisable(GL_TEXTURE_2D);CHECKGLERROR
1203                                 }
1204                         }
1205                 }
1206                 unit->t2d = tex2d;
1207                 qglBindTexture(GL_TEXTURE_2D, unit->t2d);CHECKGLERROR
1208         }
1209         // update 3d texture binding
1210         if (unit->t3d != tex3d)
1211         {
1212                 GL_ActiveTexture(unitnum);
1213                 if (unitnum < backendunits)
1214                 {
1215                         if (tex3d)
1216                         {
1217                                 if (unit->t3d == 0)
1218                                 {
1219                                         qglEnable(GL_TEXTURE_3D);CHECKGLERROR
1220                                 }
1221                         }
1222                         else
1223                         {
1224                                 if (unit->t3d)
1225                                 {
1226                                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
1227                                 }
1228                         }
1229                 }
1230                 unit->t3d = tex3d;
1231                 qglBindTexture(GL_TEXTURE_3D, unit->t3d);CHECKGLERROR
1232         }
1233         // update cubemap texture binding
1234         if (unit->tcubemap != texcubemap)
1235         {
1236                 GL_ActiveTexture(unitnum);
1237                 if (unitnum < backendunits)
1238                 {
1239                         if (texcubemap)
1240                         {
1241                                 if (unit->tcubemap == 0)
1242                                 {
1243                                         qglEnable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
1244                                 }
1245                         }
1246                         else
1247                         {
1248                                 if (unit->tcubemap)
1249                                 {
1250                                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
1251                                 }
1252                         }
1253                 }
1254                 unit->tcubemap = texcubemap;
1255                 qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, unit->tcubemap);CHECKGLERROR
1256         }
1257 }
1258
1259 void R_Mesh_TexBind1D(unsigned int unitnum, int texnum)
1260 {
1261         gltextureunit_t *unit = gl_state.units + unitnum;
1262         if (unitnum >= backendimageunits)
1263                 return;
1264         // update 1d texture binding
1265         if (unit->t1d != texnum)
1266         {
1267                 GL_ActiveTexture(unitnum);
1268                 if (unitnum < backendunits)
1269                 {
1270                         if (texnum)
1271                         {
1272                                 if (unit->t1d == 0)
1273                                 {
1274                                         qglEnable(GL_TEXTURE_1D);CHECKGLERROR
1275                                 }
1276                         }
1277                         else
1278                         {
1279                                 if (unit->t1d)
1280                                 {
1281                                         qglDisable(GL_TEXTURE_1D);CHECKGLERROR
1282                                 }
1283                         }
1284                 }
1285                 unit->t1d = texnum;
1286                 qglBindTexture(GL_TEXTURE_1D, unit->t1d);CHECKGLERROR
1287         }
1288         // update 2d texture binding
1289         if (unit->t2d)
1290         {
1291                 GL_ActiveTexture(unitnum);
1292                 if (unitnum < backendunits)
1293                 {
1294                         if (unit->t2d)
1295                         {
1296                                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
1297                         }
1298                 }
1299                 unit->t2d = 0;
1300                 qglBindTexture(GL_TEXTURE_2D, unit->t2d);CHECKGLERROR
1301         }
1302         // update 3d texture binding
1303         if (unit->t3d)
1304         {
1305                 GL_ActiveTexture(unitnum);
1306                 if (unitnum < backendunits)
1307                 {
1308                         if (unit->t3d)
1309                         {
1310                                 qglDisable(GL_TEXTURE_3D);CHECKGLERROR
1311                         }
1312                 }
1313                 unit->t3d = 0;
1314                 qglBindTexture(GL_TEXTURE_3D, unit->t3d);CHECKGLERROR
1315         }
1316         // update cubemap texture binding
1317         if (unit->tcubemap)
1318         {
1319                 GL_ActiveTexture(unitnum);
1320                 if (unitnum < backendunits)
1321                 {
1322                         if (unit->tcubemap)
1323                         {
1324                                 qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
1325                         }
1326                 }
1327                 unit->tcubemap = 0;
1328                 qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, unit->tcubemap);CHECKGLERROR
1329         }
1330 }
1331
1332 void R_Mesh_TexBind(unsigned int unitnum, int texnum)
1333 {
1334         gltextureunit_t *unit = gl_state.units + unitnum;
1335         if (unitnum >= backendimageunits)
1336                 return;
1337         // update 1d texture binding
1338         if (unit->t1d)
1339         {
1340                 GL_ActiveTexture(unitnum);
1341                 if (unitnum < backendunits)
1342                 {
1343                         if (unit->t1d)
1344                         {
1345                                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
1346                         }
1347                 }
1348                 unit->t1d = 0;
1349                 qglBindTexture(GL_TEXTURE_1D, unit->t1d);CHECKGLERROR
1350         }
1351         // update 2d texture binding
1352         if (unit->t2d != texnum)
1353         {
1354                 GL_ActiveTexture(unitnum);
1355                 if (unitnum < backendunits)
1356                 {
1357                         if (texnum)
1358                         {
1359                                 if (unit->t2d == 0)
1360                                 {
1361                                         qglEnable(GL_TEXTURE_2D);CHECKGLERROR
1362                                 }
1363                         }
1364                         else
1365                         {
1366                                 if (unit->t2d)
1367                                 {
1368                                         qglDisable(GL_TEXTURE_2D);CHECKGLERROR
1369                                 }
1370                         }
1371                 }
1372                 unit->t2d = texnum;
1373                 qglBindTexture(GL_TEXTURE_2D, unit->t2d);CHECKGLERROR
1374         }
1375         // update 3d texture binding
1376         if (unit->t3d)
1377         {
1378                 GL_ActiveTexture(unitnum);
1379                 if (unitnum < backendunits)
1380                 {
1381                         if (unit->t3d)
1382                         {
1383                                 qglDisable(GL_TEXTURE_3D);CHECKGLERROR
1384                         }
1385                 }
1386                 unit->t3d = 0;
1387                 qglBindTexture(GL_TEXTURE_3D, unit->t3d);CHECKGLERROR
1388         }
1389         // update cubemap texture binding
1390         if (unit->tcubemap != 0)
1391         {
1392                 GL_ActiveTexture(unitnum);
1393                 if (unitnum < backendunits)
1394                 {
1395                         if (unit->tcubemap)
1396                         {
1397                                 qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
1398                         }
1399                 }
1400                 unit->tcubemap = 0;
1401                 qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, unit->tcubemap);CHECKGLERROR
1402         }
1403 }
1404
1405 void R_Mesh_TexBind3D(unsigned int unitnum, int texnum)
1406 {
1407         gltextureunit_t *unit = gl_state.units + unitnum;
1408         if (unitnum >= backendimageunits)
1409                 return;
1410         // update 1d texture binding
1411         if (unit->t1d)
1412         {
1413                 GL_ActiveTexture(unitnum);
1414                 if (unitnum < backendunits)
1415                 {
1416                         if (unit->t1d)
1417                         {
1418                                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
1419                         }
1420                 }
1421                 unit->t1d = 0;
1422                 qglBindTexture(GL_TEXTURE_1D, unit->t1d);CHECKGLERROR
1423         }
1424         // update 2d texture binding
1425         if (unit->t2d)
1426         {
1427                 GL_ActiveTexture(unitnum);
1428                 if (unitnum < backendunits)
1429                 {
1430                         if (unit->t2d)
1431                         {
1432                                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
1433                         }
1434                 }
1435                 unit->t2d = 0;
1436                 qglBindTexture(GL_TEXTURE_2D, unit->t2d);CHECKGLERROR
1437         }
1438         // update 3d texture binding
1439         if (unit->t3d != texnum)
1440         {
1441                 GL_ActiveTexture(unitnum);
1442                 if (unitnum < backendunits)
1443                 {
1444                         if (texnum)
1445                         {
1446                                 if (unit->t3d == 0)
1447                                 {
1448                                         qglEnable(GL_TEXTURE_3D);CHECKGLERROR
1449                                 }
1450                         }
1451                         else
1452                         {
1453                                 if (unit->t3d)
1454                                 {
1455                                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
1456                                 }
1457                         }
1458                 }
1459                 unit->t3d = texnum;
1460                 qglBindTexture(GL_TEXTURE_3D, unit->t3d);CHECKGLERROR
1461         }
1462         // update cubemap texture binding
1463         if (unit->tcubemap != 0)
1464         {
1465                 GL_ActiveTexture(unitnum);
1466                 if (unitnum < backendunits)
1467                 {
1468                         if (unit->tcubemap)
1469                         {
1470                                 qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
1471                         }
1472                 }
1473                 unit->tcubemap = 0;
1474                 qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, unit->tcubemap);CHECKGLERROR
1475         }
1476 }
1477
1478 void R_Mesh_TexBindCubeMap(unsigned int unitnum, int texnum)
1479 {
1480         gltextureunit_t *unit = gl_state.units + unitnum;
1481         if (unitnum >= backendimageunits)
1482                 return;
1483         // update 1d texture binding
1484         if (unit->t1d)
1485         {
1486                 GL_ActiveTexture(unitnum);
1487                 if (unitnum < backendunits)
1488                 {
1489                         if (unit->t1d)
1490                         {
1491                                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
1492                         }
1493                 }
1494                 unit->t1d = 0;
1495                 qglBindTexture(GL_TEXTURE_1D, unit->t1d);CHECKGLERROR
1496         }
1497         // update 2d texture binding
1498         if (unit->t2d)
1499         {
1500                 GL_ActiveTexture(unitnum);
1501                 if (unitnum < backendunits)
1502                 {
1503                         if (unit->t2d)
1504                         {
1505                                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
1506                         }
1507                 }
1508                 unit->t2d = 0;
1509                 qglBindTexture(GL_TEXTURE_2D, unit->t2d);CHECKGLERROR
1510         }
1511         // update 3d texture binding
1512         if (unit->t3d)
1513         {
1514                 GL_ActiveTexture(unitnum);
1515                 if (unitnum < backendunits)
1516                 {
1517                         if (unit->t3d)
1518                         {
1519                                 qglDisable(GL_TEXTURE_3D);CHECKGLERROR
1520                         }
1521                 }
1522                 unit->t3d = 0;
1523                 qglBindTexture(GL_TEXTURE_3D, unit->t3d);CHECKGLERROR
1524         }
1525         // update cubemap texture binding
1526         if (unit->tcubemap != texnum)
1527         {
1528                 GL_ActiveTexture(unitnum);
1529                 if (unitnum < backendunits)
1530                 {
1531                         if (texnum)
1532                         {
1533                                 if (unit->tcubemap == 0)
1534                                 {
1535                                         qglEnable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
1536                                 }
1537                         }
1538                         else
1539                         {
1540                                 if (unit->tcubemap)
1541                                 {
1542                                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
1543                                 }
1544                         }
1545                 }
1546                 unit->tcubemap = texnum;
1547                 qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, unit->tcubemap);CHECKGLERROR
1548         }
1549 }
1550
1551 void R_Mesh_TexMatrix(unsigned int unitnum, const matrix4x4_t *matrix)
1552 {
1553         gltextureunit_t *unit = gl_state.units + unitnum;
1554         if (matrix->m[3][3])
1555         {
1556                 // texmatrix specified, check if it is different
1557                 if (!unit->texmatrixenabled || memcmp(&unit->matrix, matrix, sizeof(matrix4x4_t)))
1558                 {
1559                         matrix4x4_t tempmatrix;
1560                         unit->texmatrixenabled = true;
1561                         unit->matrix = *matrix;
1562                         CHECKGLERROR
1563                         Matrix4x4_Transpose(&tempmatrix, &unit->matrix);
1564                         qglMatrixMode(GL_TEXTURE);CHECKGLERROR
1565                         GL_ActiveTexture(unitnum);
1566                         qglLoadMatrixf(&tempmatrix.m[0][0]);CHECKGLERROR
1567                         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
1568                 }
1569         }
1570         else
1571         {
1572                 // no texmatrix specified, revert to identity
1573                 if (unit->texmatrixenabled)
1574                 {
1575                         unit->texmatrixenabled = false;
1576                         CHECKGLERROR
1577                         qglMatrixMode(GL_TEXTURE);CHECKGLERROR
1578                         GL_ActiveTexture(unitnum);
1579                         qglLoadIdentity();CHECKGLERROR
1580                         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
1581                 }
1582         }
1583 }
1584
1585 void R_Mesh_TexCombine(unsigned int unitnum, int combinergb, int combinealpha, int rgbscale, int alphascale)
1586 {
1587         gltextureunit_t *unit = gl_state.units + unitnum;
1588         CHECKGLERROR
1589         if (gl_combine.integer)
1590         {
1591                 // GL_ARB_texture_env_combine
1592                 if (!combinergb)
1593                         combinergb = GL_MODULATE;
1594                 if (!combinealpha)
1595                         combinealpha = GL_MODULATE;
1596                 if (!rgbscale)
1597                         rgbscale = 1;
1598                 if (!alphascale)
1599                         alphascale = 1;
1600                 if (unit->combinergb != combinergb)
1601                 {
1602                         unit->combinergb = combinergb;
1603                         GL_ActiveTexture(unitnum);
1604                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, unit->combinergb);CHECKGLERROR
1605                 }
1606                 if (unit->combinealpha != combinealpha)
1607                 {
1608                         unit->combinealpha = combinealpha;
1609                         GL_ActiveTexture(unitnum);
1610                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, unit->combinealpha);CHECKGLERROR
1611                 }
1612                 if (unit->rgbscale != rgbscale)
1613                 {
1614                         GL_ActiveTexture(unitnum);
1615                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, (unit->rgbscale = rgbscale));CHECKGLERROR
1616                 }
1617                 if (unit->alphascale != alphascale)
1618                 {
1619                         GL_ActiveTexture(unitnum);
1620                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, (unit->alphascale = alphascale));CHECKGLERROR
1621                 }
1622         }
1623         else
1624         {
1625                 // normal GL texenv
1626                 if (!combinergb)
1627                         combinergb = GL_MODULATE;
1628                 if (unit->combinergb != combinergb)
1629                 {
1630                         unit->combinergb = combinergb;
1631                         GL_ActiveTexture(unitnum);
1632                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, unit->combinergb);CHECKGLERROR
1633                 }
1634         }
1635 }
1636
1637 void R_Mesh_TextureState(const rmeshstate_t *m)
1638 {
1639         unsigned int i;
1640
1641         BACKENDACTIVECHECK
1642
1643         CHECKGLERROR
1644         if (gl_backend_rebindtextures)
1645         {
1646                 gl_backend_rebindtextures = false;
1647                 GL_SetupTextureState();
1648                 CHECKGLERROR
1649         }
1650
1651         for (i = 0;i < backendimageunits;i++)
1652                 R_Mesh_TexBindAll(i, m->tex1d[i], m->tex[i], m->tex3d[i], m->texcubemap[i]);
1653         for (i = 0;i < backendarrayunits;i++)
1654         {
1655                 if (m->pointer_texcoord3f[i])
1656                         R_Mesh_TexCoordPointer(i, 3, m->pointer_texcoord3f[i]);
1657                 else
1658                         R_Mesh_TexCoordPointer(i, 2, m->pointer_texcoord[i]);
1659         }
1660         for (i = 0;i < backendunits;i++)
1661         {
1662                 R_Mesh_TexMatrix(i, &m->texmatrix[i]);
1663                 R_Mesh_TexCombine(i, m->texcombinergb[i], m->texcombinealpha[i], m->texrgbscale[i], m->texalphascale[i]);
1664         }
1665         CHECKGLERROR
1666 }
1667
1668 void R_Mesh_ResetTextureState(void)
1669 {
1670         unsigned int unitnum;
1671
1672         BACKENDACTIVECHECK
1673
1674         CHECKGLERROR
1675         if (gl_backend_rebindtextures)
1676         {
1677                 gl_backend_rebindtextures = false;
1678                 GL_SetupTextureState();
1679                 CHECKGLERROR
1680         }
1681
1682         for (unitnum = 0;unitnum < backendimageunits;unitnum++)
1683         {
1684                 gltextureunit_t *unit = gl_state.units + unitnum;
1685                 // update 1d texture binding
1686                 if (unit->t1d)
1687                 {
1688                         GL_ActiveTexture(unitnum);
1689                         if (unitnum < backendunits)
1690                         {
1691                                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
1692                         }
1693                         unit->t1d = 0;
1694                         qglBindTexture(GL_TEXTURE_1D, unit->t1d);CHECKGLERROR
1695                 }
1696                 // update 2d texture binding
1697                 if (unit->t2d)
1698                 {
1699                         GL_ActiveTexture(unitnum);
1700                         if (unitnum < backendunits)
1701                         {
1702                                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
1703                         }
1704                         unit->t2d = 0;
1705                         qglBindTexture(GL_TEXTURE_2D, unit->t2d);CHECKGLERROR
1706                 }
1707                 // update 3d texture binding
1708                 if (unit->t3d)
1709                 {
1710                         GL_ActiveTexture(unitnum);
1711                         if (unitnum < backendunits)
1712                         {
1713                                 qglDisable(GL_TEXTURE_3D);CHECKGLERROR
1714                         }
1715                         unit->t3d = 0;
1716                         qglBindTexture(GL_TEXTURE_3D, unit->t3d);CHECKGLERROR
1717                 }
1718                 // update cubemap texture binding
1719                 if (unit->tcubemap)
1720                 {
1721                         GL_ActiveTexture(unitnum);
1722                         if (unitnum < backendunits)
1723                         {
1724                                 qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
1725                         }
1726                         unit->tcubemap = 0;
1727                         qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, unit->tcubemap);CHECKGLERROR
1728                 }
1729         }
1730         for (unitnum = 0;unitnum < backendarrayunits;unitnum++)
1731         {
1732                 gltextureunit_t *unit = gl_state.units + unitnum;
1733                 // texture array unit is disabled, disable the array
1734                 if (unit->arrayenabled)
1735                 {
1736                         unit->arrayenabled = false;
1737                         GL_ClientActiveTexture(unitnum);
1738                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
1739                 }
1740         }
1741         for (unitnum = 0;unitnum < backendunits;unitnum++)
1742         {
1743                 gltextureunit_t *unit = gl_state.units + unitnum;
1744                 // no texmatrix specified, revert to identity
1745                 if (unit->texmatrixenabled)
1746                 {
1747                         unit->texmatrixenabled = false;
1748                         CHECKGLERROR
1749                         qglMatrixMode(GL_TEXTURE);CHECKGLERROR
1750                         GL_ActiveTexture(unitnum);
1751                         qglLoadIdentity();CHECKGLERROR
1752                         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
1753                 }
1754                 if (gl_combine.integer)
1755                 {
1756                         // GL_ARB_texture_env_combine
1757                         if (unit->combinergb != GL_MODULATE)
1758                         {
1759                                 unit->combinergb = GL_MODULATE;
1760                                 GL_ActiveTexture(unitnum);
1761                                 qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, unit->combinergb);CHECKGLERROR
1762                         }
1763                         if (unit->combinealpha != GL_MODULATE)
1764                         {
1765                                 unit->combinealpha = GL_MODULATE;
1766                                 GL_ActiveTexture(unitnum);
1767                                 qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, unit->combinealpha);CHECKGLERROR
1768                         }
1769                         if (unit->rgbscale != 1)
1770                         {
1771                                 GL_ActiveTexture(unitnum);
1772                                 qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, (unit->rgbscale = 1));CHECKGLERROR
1773                         }
1774                         if (unit->alphascale != 1)
1775                         {
1776                                 GL_ActiveTexture(unitnum);
1777                                 qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, (unit->alphascale = 1));CHECKGLERROR
1778                         }
1779                 }
1780                 else
1781                 {
1782                         // normal GL texenv
1783                         if (unit->combinergb != GL_MODULATE)
1784                         {
1785                                 unit->combinergb = GL_MODULATE;
1786                                 GL_ActiveTexture(unitnum);
1787                                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, unit->combinergb);CHECKGLERROR
1788                         }
1789                 }
1790         }
1791 }
1792
1793 void R_Mesh_Draw_ShowTris(int firstvertex, int numvertices, int numtriangles, const int *elements)
1794 {
1795         CHECKGLERROR
1796         qglBegin(GL_LINES);
1797         for (;numtriangles;numtriangles--, elements += 3)
1798         {
1799                 qglArrayElement(elements[0]);qglArrayElement(elements[1]);
1800                 qglArrayElement(elements[1]);qglArrayElement(elements[2]);
1801                 qglArrayElement(elements[2]);qglArrayElement(elements[0]);
1802         }
1803         qglEnd();
1804         CHECKGLERROR
1805 }