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         if (!r_render.integer)
 267                 return;
 268
 269         // set up viewpoint
 270         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 271         qglLoadIdentity();CHECKGLERROR
 272         // set view pyramid
 273         qglFrustum(-frustumx * zNear, frustumx * zNear, -frustumy * zNear, frustumy * zNear, zNear, zFar);CHECKGLERROR
 274         qglGetDoublev(GL_PROJECTION_MATRIX, m);
 275         backend_projectmatrix.m[0][0] = m[0];
 276         backend_projectmatrix.m[1][0] = m[1];
 277         backend_projectmatrix.m[2][0] = m[2];
 278         backend_projectmatrix.m[3][0] = m[3];
 279         backend_projectmatrix.m[0][1] = m[4];
 280         backend_projectmatrix.m[1][1] = m[5];
 281         backend_projectmatrix.m[2][1] = m[6];
 282         backend_projectmatrix.m[3][1] = m[7];
 283         backend_projectmatrix.m[0][2] = m[8];
 284         backend_projectmatrix.m[1][2] = m[9];
 285         backend_projectmatrix.m[2][2] = m[10];
 286         backend_projectmatrix.m[3][2] = m[11];
 287         backend_projectmatrix.m[0][3] = m[12];
 288         backend_projectmatrix.m[1][3] = m[13];
 289         backend_projectmatrix.m[2][3] = m[14];
 290         backend_projectmatrix.m[3][3] = m[15];
 291         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 292         GL_SetupView_Orientation_Identity();
 293 }
 294
 295 void GL_SetupView_Mode_PerspectiveInfiniteFarClip (double frustumx, double frustumy, double zNear)
 296 {
 297         double nudge, m[16];
 298
 299         if (!r_render.integer)
 300                 return;
 301
 302         // set up viewpoint
 303         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 304         qglLoadIdentity();CHECKGLERROR
 305         // set view pyramid
 306         nudge = 1.0 - 1.0 / (1<<23);
 307         m[ 0] = 1.0 / frustumx;
 308         m[ 1] = 0;
 309         m[ 2] = 0;
 310         m[ 3] = 0;
 311         m[ 4] = 0;
 312         m[ 5] = 1.0 / frustumy;
 313         m[ 6] = 0;
 314         m[ 7] = 0;
 315         m[ 8] = 0;
 316         m[ 9] = 0;
 317         m[10] = -nudge;
 318         m[11] = -1;
 319         m[12] = 0;
 320         m[13] = 0;
 321         m[14] = -2 * zNear * nudge;
 322         m[15] = 0;
 323         qglLoadMatrixd(m);
 324         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 325         GL_SetupView_Orientation_Identity();
 326         backend_projectmatrix.m[0][0] = m[0];
 327         backend_projectmatrix.m[1][0] = m[1];
 328         backend_projectmatrix.m[2][0] = m[2];
 329         backend_projectmatrix.m[3][0] = m[3];
 330         backend_projectmatrix.m[0][1] = m[4];
 331         backend_projectmatrix.m[1][1] = m[5];
 332         backend_projectmatrix.m[2][1] = m[6];
 333         backend_projectmatrix.m[3][1] = m[7];
 334         backend_projectmatrix.m[0][2] = m[8];
 335         backend_projectmatrix.m[1][2] = m[9];
 336         backend_projectmatrix.m[2][2] = m[10];
 337         backend_projectmatrix.m[3][2] = m[11];
 338         backend_projectmatrix.m[0][3] = m[12];
 339         backend_projectmatrix.m[1][3] = m[13];
 340         backend_projectmatrix.m[2][3] = m[14];
 341         backend_projectmatrix.m[3][3] = m[15];
 342 }
 343
 344 void GL_SetupView_Mode_Ortho (double x1, double y1, double x2, double y2, double zNear, double zFar)
 345 {
 346         double m[16];
 347
 348         if (!r_render.integer)
 349                 return;
 350
 351         // set up viewpoint
 352         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 353         qglLoadIdentity();CHECKGLERROR
 354         qglOrtho(x1, x2, y2, y1, zNear, zFar);
 355         qglGetDoublev(GL_PROJECTION_MATRIX, m);
 356         backend_projectmatrix.m[0][0] = m[0];
 357         backend_projectmatrix.m[1][0] = m[1];
 358         backend_projectmatrix.m[2][0] = m[2];
 359         backend_projectmatrix.m[3][0] = m[3];
 360         backend_projectmatrix.m[0][1] = m[4];
 361         backend_projectmatrix.m[1][1] = m[5];
 362         backend_projectmatrix.m[2][1] = m[6];
 363         backend_projectmatrix.m[3][1] = m[7];
 364         backend_projectmatrix.m[0][2] = m[8];
 365         backend_projectmatrix.m[1][2] = m[9];
 366         backend_projectmatrix.m[2][2] = m[10];
 367         backend_projectmatrix.m[3][2] = m[11];
 368         backend_projectmatrix.m[0][3] = m[12];
 369         backend_projectmatrix.m[1][3] = m[13];
 370         backend_projectmatrix.m[2][3] = m[14];
 371         backend_projectmatrix.m[3][3] = m[15];
 372         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 373         GL_SetupView_Orientation_Identity();
 374 }
 375
 376 typedef struct gltextureunit_s
 377 {
 378         int t1d, t2d, t3d, tcubemap;
 379         int arrayenabled;
 380         unsigned int arraycomponents;
 381         const void *pointer_texcoord;
 382         int rgbscale, alphascale;
 383         int combinergb, combinealpha;
 384         // FIXME: add more combine stuff
 385         // texmatrixenabled exists only to avoid unnecessary texmatrix compares
 386         int texmatrixenabled;
 387         matrix4x4_t matrix;
 388 }
 389 gltextureunit_t;
 390
 391 static struct gl_state_s
 392 {
 393         int blendfunc1;
 394         int blendfunc2;
 395         int blend;
 396         GLboolean depthmask;
 397         int colormask; // stored as bottom 4 bits: r g b a (3 2 1 0 order)
 398         int depthtest;
 399         int scissortest;
 400         unsigned int unit;
 401         unsigned int clientunit;
 402         gltextureunit_t units[MAX_TEXTUREUNITS];
 403         float color4f[4];
 404         int lockrange_first;
 405         int lockrange_count;
 406         const void *pointer_vertex;
 407         const void *pointer_color;
 408 }
 409 gl_state;
 410
 411 void GL_SetupTextureState(void)
 412 {
 413         unsigned int i;
 414         gltextureunit_t *unit;
 415         CHECKGLERROR
 416         gl_state.unit = MAX_TEXTUREUNITS;
 417         gl_state.clientunit = MAX_TEXTUREUNITS;
 418         for (i = 0;i < MAX_TEXTUREUNITS;i++)
 419         {
 420                 unit = gl_state.units + i;
 421                 unit->t1d = 0;
 422                 unit->t2d = 0;
 423                 unit->t3d = 0;
 424                 unit->tcubemap = 0;
 425                 unit->arrayenabled = false;
 426                 unit->arraycomponents = 0;
 427                 unit->pointer_texcoord = NULL;
 428                 unit->rgbscale = 1;
 429                 unit->alphascale = 1;
 430                 unit->combinergb = GL_MODULATE;
 431                 unit->combinealpha = GL_MODULATE;
 432                 unit->texmatrixenabled = false;
 433                 unit->matrix = identitymatrix;
 434         }
 435
 436         for (i = 0;i < backendimageunits;i++)
 437         {
 438                 GL_ActiveTexture(i);
 439                 qglBindTexture(GL_TEXTURE_1D, 0);CHECKGLERROR
 440                 qglBindTexture(GL_TEXTURE_2D, 0);CHECKGLERROR
 441                 if (gl_texture3d)
 442                 {
 443                         qglBindTexture(GL_TEXTURE_3D, 0);CHECKGLERROR
 444                 }
 445                 if (gl_texturecubemap)
 446                 {
 447                         qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, 0);CHECKGLERROR
 448                 }
 449         }
 450
 451         for (i = 0;i < backendarrayunits;i++)
 452         {
 453                 GL_ClientActiveTexture(i);
 454                 qglTexCoordPointer(2, GL_FLOAT, sizeof(float[2]), NULL);CHECKGLERROR
 455                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 456         }
 457
 458         for (i = 0;i < backendunits;i++)
 459         {
 460                 GL_ActiveTexture(i);
 461                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 462                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 463                 if (gl_texture3d)
 464                 {
 465                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 466                 }
 467                 if (gl_texturecubemap)
 468                 {
 469                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 470                 }
 471                 qglMatrixMode(GL_TEXTURE);
 472                 qglLoadIdentity();
 473                 qglMatrixMode(GL_MODELVIEW);
 474                 if (gl_combine.integer)
 475                 {
 476                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);CHECKGLERROR
 477                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_MODULATE);CHECKGLERROR
 478                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE);CHECKGLERROR
 479                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 480                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_RGB_ARB, GL_TEXTURE);CHECKGLERROR // for GL_INTERPOLATE_ARB mode
 481                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 482                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 483                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_RGB_ARB, GL_SRC_ALPHA);CHECKGLERROR
 484                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, GL_MODULATE);CHECKGLERROR
 485                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA_ARB, GL_TEXTURE);CHECKGLERROR
 486                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_ALPHA_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 487                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_ALPHA_ARB, GL_CONSTANT_ARB);CHECKGLERROR
 488                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 489                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 490                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 491                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
 492                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
 493                 }
 494                 else
 495                 {
 496                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 497                 }
 498         }
 499         CHECKGLERROR
 500 }
 501
 502 void GL_Backend_ResetState(void)
 503 {
 504         memset(&gl_state, 0, sizeof(gl_state));
 505         gl_state.depthtest = true;
 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                         qglActiveTexture(GL_TEXTURE0_ARB + gl_state.unit);
 550                         CHECKGLERROR
 551                 }
 552         }
 553 }
 554
 555 void GL_ClientActiveTexture(unsigned int num)
 556 {
 557         if (gl_state.clientunit != num)
 558         {
 559                 gl_state.clientunit = num;
 560                 if (qglActiveTexture)
 561                 {
 562                         qglClientActiveTexture(GL_TEXTURE0_ARB + gl_state.clientunit);
 563                         CHECKGLERROR
 564                 }
 565         }
 566 }
 567
 568 void GL_BlendFunc(int blendfunc1, int blendfunc2)
 569 {
 570         if (gl_state.blendfunc1 != blendfunc1 || gl_state.blendfunc2 != blendfunc2)
 571         {
 572                 qglBlendFunc(gl_state.blendfunc1 = blendfunc1, gl_state.blendfunc2 = blendfunc2);CHECKGLERROR
 573                 if (gl_state.blendfunc2 == GL_ZERO)
 574                 {
 575                         if (gl_state.blendfunc1 == GL_ONE)
 576                         {
 577                                 if (gl_state.blend)
 578                                 {
 579                                         gl_state.blend = 0;
 580                                         qglDisable(GL_BLEND);CHECKGLERROR
 581                                 }
 582                         }
 583                         else
 584                         {
 585                                 if (!gl_state.blend)
 586                                 {
 587                                         gl_state.blend = 1;
 588                                         qglEnable(GL_BLEND);CHECKGLERROR
 589                                 }
 590                         }
 591                 }
 592                 else
 593                 {
 594                         if (!gl_state.blend)
 595                         {
 596                                 gl_state.blend = 1;
 597                                 qglEnable(GL_BLEND);CHECKGLERROR
 598                         }
 599                 }
 600         }
 601 }
 602
 603 void GL_DepthMask(int state)
 604 {
 605         if (gl_state.depthmask != state)
 606         {
 607                 qglDepthMask(gl_state.depthmask = state);CHECKGLERROR
 608         }
 609 }
 610
 611 void GL_DepthTest(int state)
 612 {
 613         if (gl_state.depthtest != state)
 614         {
 615                 gl_state.depthtest = state;
 616                 if (gl_state.depthtest)
 617                 {
 618                         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 619                 }
 620                 else
 621                 {
 622                         qglDisable(GL_DEPTH_TEST);CHECKGLERROR
 623                 }
 624         }
 625 }
 626
 627 void GL_ColorMask(int r, int g, int b, int a)
 628 {
 629         int state = r*8 + g*4 + b*2 + a*1;
 630         if (gl_state.colormask != state)
 631         {
 632                 gl_state.colormask = state;
 633                 qglColorMask((GLboolean)r, (GLboolean)g, (GLboolean)b, (GLboolean)a);CHECKGLERROR
 634         }
 635 }
 636
 637 void GL_Color(float cr, float cg, float cb, float ca)
 638 {
 639         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)
 640         {
 641                 gl_state.color4f[0] = cr;
 642                 gl_state.color4f[1] = cg;
 643                 gl_state.color4f[2] = cb;
 644                 gl_state.color4f[3] = ca;
 645                 CHECKGLERROR
 646                 qglColor4f(gl_state.color4f[0], gl_state.color4f[1], gl_state.color4f[2], gl_state.color4f[3]);
 647                 CHECKGLERROR
 648         }
 649 }
 650
 651 void GL_LockArrays(int first, int count)
 652 {
 653         if (gl_state.lockrange_count != count || gl_state.lockrange_first != first)
 654         {
 655                 if (gl_state.lockrange_count)
 656                 {
 657                         gl_state.lockrange_count = 0;
 658                         CHECKGLERROR
 659                         qglUnlockArraysEXT();
 660                         CHECKGLERROR
 661                 }
 662                 if (count && gl_supportslockarrays && gl_lockarrays.integer && r_render.integer)
 663                 {
 664                         gl_state.lockrange_first = first;
 665                         gl_state.lockrange_count = count;
 666                         CHECKGLERROR
 667                         qglLockArraysEXT(first, count);
 668                         CHECKGLERROR
 669                 }
 670         }
 671 }
 672
 673 void GL_Scissor (int x, int y, int width, int height)
 674 {
 675         CHECKGLERROR
 676         qglScissor(x, vid.height - (y + height),width,height);
 677         CHECKGLERROR
 678 }
 679
 680 void GL_ScissorTest(int state)
 681 {
 682         if(gl_state.scissortest == state)
 683                 return;
 684
 685         CHECKGLERROR
 686         if((gl_state.scissortest = state))
 687                 qglEnable(GL_SCISSOR_TEST);
 688         else
 689                 qglDisable(GL_SCISSOR_TEST);
 690         CHECKGLERROR
 691 }
 692
 693 void GL_Clear(int mask)
 694 {
 695         qglClear(mask);CHECKGLERROR
 696 }
 697
 698 void GL_TransformToScreen(const vec4_t in, vec4_t out)
 699 {
 700         vec4_t temp;
 701         float iw;
 702         Matrix4x4_Transform4 (&backend_viewmatrix, in, temp);
 703         Matrix4x4_Transform4 (&backend_projectmatrix, temp, out);
 704         iw = 1.0f / out[3];
 705         out[0] = r_view_x + (out[0] * iw + 1.0f) * r_view_width * 0.5f;
 706         out[1] = r_view_y + (out[1] * iw + 1.0f) * r_view_height * 0.5f;
 707         out[2] = r_view_z + (out[2] * iw + 1.0f) * r_view_depth * 0.5f;
 708 }
 709
 710 // called at beginning of frame
 711 void R_Mesh_Start(void)
 712 {
 713         BACKENDACTIVECHECK
 714         CHECKGLERROR
 715         GL_Backend_ResetState();
 716 }
 717
 718 unsigned int GL_Backend_CompileProgram(int vertexstrings_count, const char **vertexstrings_list, int fragmentstrings_count, const char **fragmentstrings_list)
 719 {
 720         GLint vertexshadercompiled, fragmentshadercompiled, programlinked;
 721         GLuint vertexshaderobject, fragmentshaderobject, programobject = 0;
 722         char compilelog[MAX_INPUTLINE];
 723         CHECKGLERROR
 724
 725         programobject = qglCreateProgramObjectARB();
 726         CHECKGLERROR
 727         if (!programobject)
 728                 return 0;
 729
 730         if (developer.integer >= 100)
 731         {
 732                 int i;
 733                 Con_Printf("Compiling shader:\n");
 734                 if (vertexstrings_count)
 735                 {
 736                         Con_Printf("------ VERTEX SHADER ------\n");
 737                         for (i = 0;i < vertexstrings_count;i++)
 738                                 Con_Print(vertexstrings_list[i]);
 739                         Con_Print("\n");
 740                 }
 741                 if (fragmentstrings_count)
 742                 {
 743                         Con_Printf("------ FRAGMENT SHADER ------\n");
 744                         for (i = 0;i < fragmentstrings_count;i++)
 745                                 Con_Print(fragmentstrings_list[i]);
 746                         Con_Print("\n");
 747                 }
 748         }
 749
 750         if (vertexstrings_count)
 751         {
 752                 CHECKGLERROR
 753                 vertexshaderobject = qglCreateShaderObjectARB(GL_VERTEX_SHADER_ARB);
 754                 if (!vertexshaderobject)
 755                 {
 756                         qglDeleteObjectARB(programobject);
 757                         CHECKGLERROR
 758                         return 0;
 759                 }
 760                 qglShaderSourceARB(vertexshaderobject, vertexstrings_count, vertexstrings_list, NULL);
 761                 qglCompileShaderARB(vertexshaderobject);
 762                 CHECKGLERROR
 763                 qglGetObjectParameterivARB(vertexshaderobject, GL_OBJECT_COMPILE_STATUS_ARB, &vertexshadercompiled);
 764                 qglGetInfoLogARB(vertexshaderobject, sizeof(compilelog), NULL, compilelog);
 765                 if (compilelog[0])
 766                         Con_DPrintf("vertex shader compile log:\n%s\n", compilelog);
 767                 if (!vertexshadercompiled)
 768                 {
 769                         qglDeleteObjectARB(programobject);
 770                         qglDeleteObjectARB(vertexshaderobject);
 771                         CHECKGLERROR
 772                         return 0;
 773                 }
 774                 qglAttachObjectARB(programobject, vertexshaderobject);
 775                 qglDeleteObjectARB(vertexshaderobject);
 776                 CHECKGLERROR
 777         }
 778
 779         if (fragmentstrings_count)
 780         {
 781                 CHECKGLERROR
 782                 fragmentshaderobject = qglCreateShaderObjectARB(GL_FRAGMENT_SHADER_ARB);
 783                 if (!fragmentshaderobject)
 784                 {
 785                         qglDeleteObjectARB(programobject);
 786                         CHECKGLERROR
 787                         return 0;
 788                 }
 789                 qglShaderSourceARB(fragmentshaderobject, fragmentstrings_count, fragmentstrings_list, NULL);
 790                 qglCompileShaderARB(fragmentshaderobject);
 791                 CHECKGLERROR
 792                 qglGetObjectParameterivARB(fragmentshaderobject, GL_OBJECT_COMPILE_STATUS_ARB, &fragmentshadercompiled);
 793                 qglGetInfoLogARB(fragmentshaderobject, sizeof(compilelog), NULL, compilelog);
 794                 if (compilelog[0])
 795                         Con_DPrintf("fragment shader compile log:\n%s\n", compilelog);
 796                 if (!fragmentshadercompiled)
 797                 {
 798                         qglDeleteObjectARB(programobject);
 799                         qglDeleteObjectARB(fragmentshaderobject);
 800                         CHECKGLERROR
 801                         return 0;
 802                 }
 803                 qglAttachObjectARB(programobject, fragmentshaderobject);
 804                 qglDeleteObjectARB(fragmentshaderobject);
 805                 CHECKGLERROR
 806         }
 807
 808         qglLinkProgramARB(programobject);
 809         CHECKGLERROR
 810         qglGetObjectParameterivARB(programobject, GL_OBJECT_LINK_STATUS_ARB, &programlinked);
 811         qglGetInfoLogARB(programobject, sizeof(compilelog), NULL, compilelog);
 812         if (compilelog[0])
 813         {
 814                 Con_DPrintf("program link log:\n%s\n", compilelog);
 815                 // software vertex shader is ok but software fragment shader is WAY
 816                 // too slow, fail program if so.
 817                 // NOTE: this string might be ATI specific, but that's ok because the
 818                 // ATI R300 chip (Radeon 9500-9800/X300) is the most likely to use a
 819                 // software fragment shader due to low instruction and dependent
 820                 // texture limits.
 821                 if (strstr(compilelog, "fragment shader will run in software"))
 822                         programlinked = false;
 823         }
 824         CHECKGLERROR
 825         if (!programlinked)
 826         {
 827                 qglDeleteObjectARB(programobject);
 828                 return 0;
 829         }
 830         CHECKGLERROR
 831         return programobject;
 832 }
 833
 834 void GL_Backend_FreeProgram(unsigned int prog)
 835 {
 836         CHECKGLERROR
 837         qglDeleteObjectARB(prog);
 838         CHECKGLERROR
 839 }
 840
 841 int gl_backend_rebindtextures;
 842
 843 void GL_Backend_RenumberElements(int *out, int count, const int *in, int offset)
 844 {
 845         int i;
 846         if (offset)
 847         {
 848                 for (i = 0;i < count;i++)
 849                         *out++ = *in++ + offset;
 850         }
 851         else
 852                 memcpy(out, in, sizeof(*out) * count);
 853 }
 854
 855 // renders triangles using vertices from the active arrays
 856 int paranoidblah = 0;
 857 void R_Mesh_Draw(int firstvertex, int numvertices, int numtriangles, const int *elements)
 858 {
 859         unsigned int numelements = numtriangles * 3;
 860         if (numvertices < 3 || numtriangles < 1)
 861         {
 862                 Con_Printf("R_Mesh_Draw(%d, %d, %d, %08p);\n", firstvertex, numvertices, numtriangles, elements);
 863                 return;
 864         }
 865         //CHECKGLERROR
 866         renderstats.meshes++;
 867         renderstats.meshes_elements += numelements;
 868         if (gl_paranoid.integer)
 869         {
 870                 unsigned int i, j, size;
 871                 const int *p;
 872                 if (!qglIsEnabled(GL_VERTEX_ARRAY))
 873                         Con_Print("R_Mesh_Draw: vertex array not enabled\n");
 874                 for (j = 0, size = numvertices * 3, p = (int *)((float *)gl_state.pointer_vertex + firstvertex * 3);j < size;j++, p++)
 875                         paranoidblah += *p;
 876                 if (gl_state.pointer_color)
 877                 {
 878                         if (!qglIsEnabled(GL_COLOR_ARRAY))
 879                                 Con_Print("R_Mesh_Draw: color array set but not enabled\n");
 880                         for (j = 0, size = numvertices * 4, p = (int *)((float *)gl_state.pointer_color + firstvertex * 4);j < size;j++, p++)
 881                                 paranoidblah += *p;
 882                 }
 883                 for (i = 0;i < backendarrayunits;i++)
 884                 {
 885                         if (gl_state.units[i].arrayenabled)
 886                         {
 887                                 GL_ClientActiveTexture(i);
 888                                 if (!qglIsEnabled(GL_TEXTURE_COORD_ARRAY))
 889                                         Con_Print("R_Mesh_Draw: texcoord array set but not enabled\n");
 890                                 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++)
 891                                         paranoidblah += *p;
 892                         }
 893                 }
 894                 for (i = 0;i < (unsigned int) numtriangles * 3;i++)
 895                 {
 896                         if (elements[i] < firstvertex || elements[i] >= firstvertex + numvertices)
 897                         {
 898                                 Con_Printf("R_Mesh_Draw: invalid vertex index %i (outside range %i - %i) in elements list\n", elements[i], firstvertex, firstvertex + numvertices);
 899                                 return;
 900                         }
 901                 }
 902                 CHECKGLERROR
 903         }
 904         if (r_render.integer)
 905         {
 906                 CHECKGLERROR
 907                 if (gl_mesh_testmanualfeeding.integer)
 908                 {
 909                         unsigned int i, j;
 910                         const GLfloat *p;
 911                         qglBegin(GL_TRIANGLES);
 912                         for (i = 0;i < (unsigned int) numtriangles * 3;i++)
 913                         {
 914                                 for (j = 0;j < backendarrayunits;j++)
 915                                 {
 916                                         if (gl_state.units[j].pointer_texcoord)
 917                                         {
 918                                                 if (backendarrayunits > 1)
 919                                                 {
 920                                                         if (gl_state.units[j].arraycomponents == 4)
 921                                                         {
 922                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 4;
 923                                                                 qglMultiTexCoord4f(GL_TEXTURE0_ARB + j, p[0], p[1], p[2], p[3]);
 924                                                         }
 925                                                         else if (gl_state.units[j].arraycomponents == 3)
 926                                                         {
 927                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 3;
 928                                                                 qglMultiTexCoord3f(GL_TEXTURE0_ARB + j, p[0], p[1], p[2]);
 929                                                         }
 930                                                         else if (gl_state.units[j].arraycomponents == 2)
 931                                                         {
 932                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 2;
 933                                                                 qglMultiTexCoord2f(GL_TEXTURE0_ARB + j, p[0], p[1]);
 934                                                         }
 935                                                         else
 936                                                         {
 937                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 1;
 938                                                                 qglMultiTexCoord1f(GL_TEXTURE0_ARB + j, p[0]);
 939                                                         }
 940                                                 }
 941                                                 else
 942                                                 {
 943                                                         if (gl_state.units[j].arraycomponents == 4)
 944                                                         {
 945                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 4;
 946                                                                 qglTexCoord4f(p[0], p[1], p[2], p[3]);
 947                                                         }
 948                                                         else if (gl_state.units[j].arraycomponents == 3)
 949                                                         {
 950                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 3;
 951                                                                 qglTexCoord3f(p[0], p[1], p[2]);
 952                                                         }
 953                                                         else if (gl_state.units[j].arraycomponents == 2)
 954                                                         {
 955                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 2;
 956                                                                 qglTexCoord2f(p[0], p[1]);
 957                                                         }
 958                                                         else
 959                                                         {
 960                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 1;
 961                                                                 qglTexCoord1f(p[0]);
 962                                                         }
 963                                                 }
 964                                         }
 965                                 }
 966                                 if (gl_state.pointer_color)
 967                                 {
 968                                         p = ((const GLfloat *)(gl_state.pointer_color)) + elements[i] * 4;
 969                                         qglColor4f(p[0], p[1], p[2], p[3]);
 970                                 }
 971                                 p = ((const GLfloat *)(gl_state.pointer_vertex)) + elements[i] * 3;
 972                                 qglVertex3f(p[0], p[1], p[2]);
 973                         }
 974                         qglEnd();
 975                         CHECKGLERROR
 976                 }
 977                 else if (gl_mesh_testarrayelement.integer)
 978                 {
 979                         int i;
 980                         qglBegin(GL_TRIANGLES);
 981                         for (i = 0;i < numtriangles * 3;i++)
 982                         {
 983                                 qglArrayElement(elements[i]);
 984                         }
 985                         qglEnd();
 986                         CHECKGLERROR
 987                 }
 988                 else if (gl_mesh_drawrangeelements.integer && qglDrawRangeElements != NULL)
 989                 {
 990                         qglDrawRangeElements(GL_TRIANGLES, firstvertex, firstvertex + numvertices, numelements, GL_UNSIGNED_INT, elements);
 991                         CHECKGLERROR
 992                 }
 993                 else
 994                 {
 995                         qglDrawElements(GL_TRIANGLES, numelements, GL_UNSIGNED_INT, elements);
 996                         CHECKGLERROR
 997                 }
 998         }
 999 }
1000
1001 // restores backend state, used when done with 3D rendering
1002 void R_Mesh_Finish(void)
1003 {
1004         unsigned int i;
1005         BACKENDACTIVECHECK
1006         CHECKGLERROR
1007         GL_LockArrays(0, 0);
1008         CHECKGLERROR
1009
1010         for (i = 0;i < backendimageunits;i++)
1011         {
1012                 GL_ActiveTexture(i);
1013                 qglBindTexture(GL_TEXTURE_1D, 0);CHECKGLERROR
1014                 qglBindTexture(GL_TEXTURE_2D, 0);CHECKGLERROR
1015                 if (gl_texture3d)
1016                 {
1017                         qglBindTexture(GL_TEXTURE_3D, 0);CHECKGLERROR
1018                 }
1019                 if (gl_texturecubemap)
1020                 {
1021                         qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, 0);CHECKGLERROR
1022                 }
1023         }
1024         for (i = 0;i < backendarrayunits;i++)
1025         {
1026                 GL_ActiveTexture(backendarrayunits - 1 - i);
1027                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
1028         }
1029         for (i = 0;i < backendunits;i++)
1030         {
1031                 GL_ActiveTexture(backendunits - 1 - i);
1032                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
1033                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
1034                 if (gl_texture3d)
1035                 {
1036                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
1037                 }
1038                 if (gl_texturecubemap)
1039                 {
1040                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
1041                 }
1042                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
1043                 if (gl_combine.integer)
1044                 {
1045                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
1046                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
1047                 }
1048         }
1049         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
1050         qglDisableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
1051
1052         qglDisable(GL_BLEND);CHECKGLERROR
1053         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
1054         qglDepthMask(GL_TRUE);CHECKGLERROR
1055         qglBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);CHECKGLERROR
1056 }
1057
1058 void R_Mesh_Matrix(const matrix4x4_t *matrix)
1059 {
1060         if (memcmp(matrix, &backend_modelmatrix, sizeof(matrix4x4_t)))
1061         {
1062                 backend_modelmatrix = *matrix;
1063                 Matrix4x4_Concat(&backend_modelviewmatrix, &backend_viewmatrix, matrix);
1064                 Matrix4x4_Transpose(&backend_glmodelviewmatrix, &backend_modelviewmatrix);
1065                 qglLoadMatrixf(&backend_glmodelviewmatrix.m[0][0]);
1066         }
1067 }
1068
1069 void R_Mesh_VertexPointer(const float *vertex3f)
1070 {
1071         if (gl_state.pointer_vertex != vertex3f)
1072         {
1073                 gl_state.pointer_vertex = vertex3f;
1074                 CHECKGLERROR
1075                 qglVertexPointer(3, GL_FLOAT, sizeof(float[3]), gl_state.pointer_vertex);
1076                 CHECKGLERROR
1077         }
1078 }
1079
1080 void R_Mesh_ColorPointer(const float *color4f)
1081 {
1082         if (gl_state.pointer_color != color4f)
1083         {
1084                 CHECKGLERROR
1085                 if (!gl_state.pointer_color)
1086                 {
1087                         qglEnableClientState(GL_COLOR_ARRAY);
1088                         CHECKGLERROR
1089                 }
1090                 else if (!color4f)
1091                 {
1092                         qglDisableClientState(GL_COLOR_ARRAY);
1093                         CHECKGLERROR
1094                         // when color array is on the glColor gets trashed, set it again
1095                         qglColor4f(gl_state.color4f[0], gl_state.color4f[1], gl_state.color4f[2], gl_state.color4f[3]);
1096                         CHECKGLERROR
1097                 }
1098                 gl_state.pointer_color = color4f;
1099                 qglColorPointer(4, GL_FLOAT, sizeof(float[4]), gl_state.pointer_color);
1100                 CHECKGLERROR
1101         }
1102 }
1103
1104 void R_Mesh_TexCoordPointer(unsigned int unitnum, unsigned int numcomponents, const float *texcoord)
1105 {
1106         gltextureunit_t *unit = gl_state.units + unitnum;
1107         // update array settings
1108         if (texcoord)
1109         {
1110                 // texcoord array
1111                 if (unit->pointer_texcoord != texcoord || unit->arraycomponents != numcomponents)
1112                 {
1113                         unit->pointer_texcoord = texcoord;
1114                         unit->arraycomponents = numcomponents;
1115                         GL_ClientActiveTexture(unitnum);
1116                         qglTexCoordPointer(unit->arraycomponents, GL_FLOAT, sizeof(float) * unit->arraycomponents, unit->pointer_texcoord);
1117                         CHECKGLERROR
1118                 }
1119                 // texture array unit is enabled, enable the array
1120                 if (!unit->arrayenabled)
1121                 {
1122                         unit->arrayenabled = true;
1123                         GL_ClientActiveTexture(unitnum);
1124                         qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
1125                 }
1126         }
1127         else
1128         {
1129                 // texture array unit is disabled, disable the array
1130                 if (unit->arrayenabled)
1131                 {
1132                         unit->arrayenabled = false;
1133                         GL_ClientActiveTexture(unitnum);
1134                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
1135                 }
1136         }
1137 }
1138
1139 void R_Mesh_TexBindAll(unsigned int unitnum, int tex1d, int tex2d, int tex3d, int texcubemap)
1140 {
1141         gltextureunit_t *unit = gl_state.units + unitnum;
1142         if (unitnum >= backendimageunits)
1143                 return;
1144         // update 1d texture binding
1145         if (unit->t1d != tex1d)
1146         {
1147                 GL_ActiveTexture(unitnum);
1148                 if (unitnum < backendunits)
1149                 {
1150                         if (tex1d)
1151                         {
1152                                 if (unit->t1d == 0)
1153                                         qglEnable(GL_TEXTURE_1D);
1154                         }
1155                         else
1156                         {
1157                                 if (unit->t1d)
1158                                         qglDisable(GL_TEXTURE_1D);
1159                         }
1160                 }
1161                 unit->t1d = tex1d;
1162                 qglBindTexture(GL_TEXTURE_1D, unit->t1d);
1163                 CHECKGLERROR
1164         }
1165         // update 2d texture binding
1166         if (unit->t2d != tex2d)
1167         {
1168                 GL_ActiveTexture(unitnum);
1169                 if (unitnum < backendunits)
1170                 {
1171                         if (tex2d)
1172                         {
1173                                 if (unit->t2d == 0)
1174                                         qglEnable(GL_TEXTURE_2D);
1175                         }
1176                         else
1177                         {
1178                                 if (unit->t2d)
1179                                         qglDisable(GL_TEXTURE_2D);
1180                         }
1181                 }
1182                 unit->t2d = tex2d;
1183                 qglBindTexture(GL_TEXTURE_2D, unit->t2d);
1184                 CHECKGLERROR
1185         }
1186         // update 3d texture binding
1187         if (unit->t3d != tex3d)
1188         {
1189                 GL_ActiveTexture(unitnum);
1190                 if (unitnum < backendunits)
1191                 {
1192                         if (tex3d)
1193                         {
1194                                 if (unit->t3d == 0)
1195                                         qglEnable(GL_TEXTURE_3D);
1196                         }
1197                         else
1198                         {
1199                                 if (unit->t3d)
1200                                         qglDisable(GL_TEXTURE_3D);
1201                         }
1202                 }
1203                 unit->t3d = tex3d;
1204                 qglBindTexture(GL_TEXTURE_3D, unit->t3d);
1205                 CHECKGLERROR
1206         }
1207         // update cubemap texture binding
1208         if (unit->tcubemap != texcubemap)
1209         {
1210                 GL_ActiveTexture(unitnum);
1211                 if (unitnum < backendunits)
1212                 {
1213                         if (texcubemap)
1214                         {
1215                                 if (unit->tcubemap == 0)
1216                                         qglEnable(GL_TEXTURE_CUBE_MAP_ARB);
1217                         }
1218                         else
1219                         {
1220                                 if (unit->tcubemap)
1221                                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);
1222                         }
1223                 }
1224                 unit->tcubemap = texcubemap;
1225                 qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, unit->tcubemap);
1226                 CHECKGLERROR
1227         }
1228 }
1229
1230 void R_Mesh_TexBind1D(unsigned int unitnum, int texnum)
1231 {
1232         gltextureunit_t *unit = gl_state.units + unitnum;
1233         if (unitnum >= backendimageunits)
1234                 return;
1235         // update 1d texture binding
1236         if (unit->t1d != texnum)
1237         {
1238                 GL_ActiveTexture(unitnum);
1239                 if (unitnum < backendunits)
1240                 {
1241                         if (texnum)
1242                         {
1243                                 if (unit->t1d == 0)
1244                                         qglEnable(GL_TEXTURE_1D);
1245                         }
1246                         else
1247                         {
1248                                 if (unit->t1d)
1249                                         qglDisable(GL_TEXTURE_1D);
1250                         }
1251                 }
1252                 unit->t1d = texnum;
1253                 qglBindTexture(GL_TEXTURE_1D, unit->t1d);
1254                 CHECKGLERROR
1255         }
1256         // update 2d texture binding
1257         if (unit->t2d)
1258         {
1259                 GL_ActiveTexture(unitnum);
1260                 if (unitnum < backendunits)
1261                 {
1262                         if (unit->t2d)
1263                                 qglDisable(GL_TEXTURE_2D);
1264                 }
1265                 unit->t2d = 0;
1266                 qglBindTexture(GL_TEXTURE_2D, unit->t2d);
1267                 CHECKGLERROR
1268         }
1269         // update 3d texture binding
1270         if (unit->t3d)
1271         {
1272                 GL_ActiveTexture(unitnum);
1273                 if (unitnum < backendunits)
1274                 {
1275                         if (unit->t3d)
1276                                 qglDisable(GL_TEXTURE_3D);
1277                 }
1278                 unit->t3d = 0;
1279                 qglBindTexture(GL_TEXTURE_3D, unit->t3d);
1280                 CHECKGLERROR
1281         }
1282         // update cubemap texture binding
1283         if (unit->tcubemap)
1284         {
1285                 GL_ActiveTexture(unitnum);
1286                 if (unitnum < backendunits)
1287                 {
1288                         if (unit->tcubemap)
1289                                 qglDisable(GL_TEXTURE_CUBE_MAP_ARB);
1290                 }
1291                 unit->tcubemap = 0;
1292                 qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, unit->tcubemap);
1293                 CHECKGLERROR
1294         }
1295 }
1296
1297 void R_Mesh_TexBind(unsigned int unitnum, int texnum)
1298 {
1299         gltextureunit_t *unit = gl_state.units + unitnum;
1300         if (unitnum >= backendimageunits)
1301                 return;
1302         // update 1d texture binding
1303         if (unit->t1d)
1304         {
1305                 GL_ActiveTexture(unitnum);
1306                 if (unitnum < backendunits)
1307                 {
1308                         if (unit->t1d)
1309                                 qglDisable(GL_TEXTURE_1D);
1310                 }
1311                 unit->t1d = 0;
1312                 qglBindTexture(GL_TEXTURE_1D, unit->t1d);
1313                 CHECKGLERROR
1314         }
1315         // update 2d texture binding
1316         if (unit->t2d != texnum)
1317         {
1318                 GL_ActiveTexture(unitnum);
1319                 if (unitnum < backendunits)
1320                 {
1321                         if (texnum)
1322                         {
1323                                 if (unit->t2d == 0)
1324                                         qglEnable(GL_TEXTURE_2D);
1325                         }
1326                         else
1327                         {
1328                                 if (unit->t2d)
1329                                         qglDisable(GL_TEXTURE_2D);
1330                         }
1331                 }
1332                 unit->t2d = texnum;
1333                 qglBindTexture(GL_TEXTURE_2D, unit->t2d);
1334                 CHECKGLERROR
1335         }
1336         // update 3d texture binding
1337         if (unit->t3d)
1338         {
1339                 GL_ActiveTexture(unitnum);
1340                 if (unitnum < backendunits)
1341                 {
1342                         if (unit->t3d)
1343                                 qglDisable(GL_TEXTURE_3D);
1344                 }
1345                 unit->t3d = 0;
1346                 qglBindTexture(GL_TEXTURE_3D, unit->t3d);
1347                 CHECKGLERROR
1348         }
1349         // update cubemap texture binding
1350         if (unit->tcubemap != 0)
1351         {
1352                 GL_ActiveTexture(unitnum);
1353                 if (unitnum < backendunits)
1354                 {
1355                         if (unit->tcubemap)
1356                                 qglDisable(GL_TEXTURE_CUBE_MAP_ARB);
1357                 }
1358                 unit->tcubemap = 0;
1359                 qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, unit->tcubemap);
1360                 CHECKGLERROR
1361         }
1362 }
1363
1364 void R_Mesh_TexBind3D(unsigned int unitnum, int texnum)
1365 {
1366         gltextureunit_t *unit = gl_state.units + unitnum;
1367         if (unitnum >= backendimageunits)
1368                 return;
1369         // update 1d texture binding
1370         if (unit->t1d)
1371         {
1372                 GL_ActiveTexture(unitnum);
1373                 if (unitnum < backendunits)
1374                 {
1375                         if (unit->t1d)
1376                                 qglDisable(GL_TEXTURE_1D);
1377                 }
1378                 unit->t1d = 0;
1379                 qglBindTexture(GL_TEXTURE_1D, unit->t1d);
1380                 CHECKGLERROR
1381         }
1382         // update 2d texture binding
1383         if (unit->t2d)
1384         {
1385                 GL_ActiveTexture(unitnum);
1386                 if (unitnum < backendunits)
1387                 {
1388                         if (unit->t2d)
1389                                 qglDisable(GL_TEXTURE_2D);
1390                 }
1391                 unit->t2d = 0;
1392                 qglBindTexture(GL_TEXTURE_2D, unit->t2d);
1393                 CHECKGLERROR
1394         }
1395         // update 3d texture binding
1396         if (unit->t3d != texnum)
1397         {
1398                 GL_ActiveTexture(unitnum);
1399                 if (unitnum < backendunits)
1400                 {
1401                         if (texnum)
1402                         {
1403                                 if (unit->t3d == 0)
1404                                         qglEnable(GL_TEXTURE_3D);
1405                         }
1406                         else
1407                         {
1408                                 if (unit->t3d)
1409                                         qglDisable(GL_TEXTURE_3D);
1410                         }
1411                 }
1412                 unit->t3d = texnum;
1413                 qglBindTexture(GL_TEXTURE_3D, unit->t3d);
1414                 CHECKGLERROR
1415         }
1416         // update cubemap texture binding
1417         if (unit->tcubemap != 0)
1418         {
1419                 GL_ActiveTexture(unitnum);
1420                 if (unitnum < backendunits)
1421                 {
1422                         if (unit->tcubemap)
1423                                 qglDisable(GL_TEXTURE_CUBE_MAP_ARB);
1424                 }
1425                 unit->tcubemap = 0;
1426                 qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, unit->tcubemap);
1427                 CHECKGLERROR
1428         }
1429 }
1430
1431 void R_Mesh_TexBindCubeMap(unsigned int unitnum, int texnum)
1432 {
1433         gltextureunit_t *unit = gl_state.units + unitnum;
1434         if (unitnum >= backendimageunits)
1435                 return;
1436         // update 1d texture binding
1437         if (unit->t1d)
1438         {
1439                 GL_ActiveTexture(unitnum);
1440                 if (unitnum < backendunits)
1441                 {
1442                         if (unit->t1d)
1443                                 qglDisable(GL_TEXTURE_1D);
1444                 }
1445                 unit->t1d = 0;
1446                 qglBindTexture(GL_TEXTURE_1D, unit->t1d);
1447                 CHECKGLERROR
1448         }
1449         // update 2d texture binding
1450         if (unit->t2d)
1451         {
1452                 GL_ActiveTexture(unitnum);
1453                 if (unitnum < backendunits)
1454                 {
1455                         if (unit->t2d)
1456                                 qglDisable(GL_TEXTURE_2D);
1457                 }
1458                 unit->t2d = 0;
1459                 qglBindTexture(GL_TEXTURE_2D, unit->t2d);
1460                 CHECKGLERROR
1461         }
1462         // update 3d texture binding
1463         if (unit->t3d)
1464         {
1465                 GL_ActiveTexture(unitnum);
1466                 if (unitnum < backendunits)
1467                 {
1468                         if (unit->t3d)
1469                                 qglDisable(GL_TEXTURE_3D);
1470                 }
1471                 unit->t3d = 0;
1472                 qglBindTexture(GL_TEXTURE_3D, unit->t3d);
1473                 CHECKGLERROR
1474         }
1475         // update cubemap texture binding
1476         if (unit->tcubemap != texnum)
1477         {
1478                 GL_ActiveTexture(unitnum);
1479                 if (unitnum < backendunits)
1480                 {
1481                         if (texnum)
1482                         {
1483                                 if (unit->tcubemap == 0)
1484                                         qglEnable(GL_TEXTURE_CUBE_MAP_ARB);
1485                         }
1486                         else
1487                         {
1488                                 if (unit->tcubemap)
1489                                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);
1490                         }
1491                 }
1492                 unit->tcubemap = texnum;
1493                 qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, unit->tcubemap);
1494                 CHECKGLERROR
1495         }
1496 }
1497
1498 void R_Mesh_TexMatrix(unsigned int unitnum, const matrix4x4_t *matrix)
1499 {
1500         gltextureunit_t *unit = gl_state.units + unitnum;
1501         if (matrix->m[3][3])
1502         {
1503                 // texmatrix specified, check if it is different
1504                 if (!unit->texmatrixenabled || memcmp(&unit->matrix, matrix, sizeof(matrix4x4_t)))
1505                 {
1506                         matrix4x4_t tempmatrix;
1507                         unit->texmatrixenabled = true;
1508                         unit->matrix = *matrix;
1509                         Matrix4x4_Transpose(&tempmatrix, &unit->matrix);
1510                         qglMatrixMode(GL_TEXTURE);
1511                         GL_ActiveTexture(unitnum);
1512                         qglLoadMatrixf(&tempmatrix.m[0][0]);
1513                         qglMatrixMode(GL_MODELVIEW);
1514                 }
1515         }
1516         else
1517         {
1518                 // no texmatrix specified, revert to identity
1519                 if (unit->texmatrixenabled)
1520                 {
1521                         unit->texmatrixenabled = false;
1522                         qglMatrixMode(GL_TEXTURE);
1523                         GL_ActiveTexture(unitnum);
1524                         qglLoadIdentity();
1525                         qglMatrixMode(GL_MODELVIEW);
1526                 }
1527         }
1528 }
1529
1530 void R_Mesh_TexCombine(unsigned int unitnum, int combinergb, int combinealpha, int rgbscale, int alphascale)
1531 {
1532         gltextureunit_t *unit = gl_state.units + unitnum;
1533         if (gl_combine.integer)
1534         {
1535                 // GL_ARB_texture_env_combine
1536                 if (!combinergb)
1537                         combinergb = GL_MODULATE;
1538                 if (!combinealpha)
1539                         combinealpha = GL_MODULATE;
1540                 if (!rgbscale)
1541                         rgbscale = 1;
1542                 if (!alphascale)
1543                         alphascale = 1;
1544                 if (unit->combinergb != combinergb)
1545                 {
1546                         unit->combinergb = combinergb;
1547                         GL_ActiveTexture(unitnum);
1548                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, unit->combinergb);CHECKGLERROR
1549                 }
1550                 if (unit->combinealpha != combinealpha)
1551                 {
1552                         unit->combinealpha = combinealpha;
1553                         GL_ActiveTexture(unitnum);
1554                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, unit->combinealpha);CHECKGLERROR
1555                 }
1556                 if (unit->rgbscale != rgbscale)
1557                 {
1558                         GL_ActiveTexture(unitnum);
1559                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, (unit->rgbscale = rgbscale));CHECKGLERROR
1560                 }
1561                 if (unit->alphascale != alphascale)
1562                 {
1563                         GL_ActiveTexture(unitnum);
1564                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, (unit->alphascale = alphascale));CHECKGLERROR
1565                 }
1566         }
1567         else
1568         {
1569                 // normal GL texenv
1570                 if (!combinergb)
1571                         combinergb = GL_MODULATE;
1572                 if (unit->combinergb != combinergb)
1573                 {
1574                         unit->combinergb = combinergb;
1575                         GL_ActiveTexture(unitnum);
1576                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, unit->combinergb);CHECKGLERROR
1577                 }
1578         }
1579 }
1580
1581 void R_Mesh_TextureState(const rmeshstate_t *m)
1582 {
1583         unsigned int i;
1584
1585         BACKENDACTIVECHECK
1586
1587         if (gl_backend_rebindtextures)
1588         {
1589                 gl_backend_rebindtextures = false;
1590                 GL_SetupTextureState();
1591         }
1592
1593         for (i = 0;i < backendimageunits;i++)
1594                 R_Mesh_TexBindAll(i, m->tex1d[i], m->tex[i], m->tex3d[i], m->texcubemap[i]);
1595         for (i = 0;i < backendarrayunits;i++)
1596         {
1597                 if (m->pointer_texcoord3f[i])
1598                         R_Mesh_TexCoordPointer(i, 3, m->pointer_texcoord3f[i]);
1599                 else
1600                         R_Mesh_TexCoordPointer(i, 2, m->pointer_texcoord[i]);
1601         }
1602         for (i = 0;i < backendunits;i++)
1603         {
1604                 R_Mesh_TexMatrix(i, &m->texmatrix[i]);
1605                 R_Mesh_TexCombine(i, m->texcombinergb[i], m->texcombinealpha[i], m->texrgbscale[i], m->texalphascale[i]);
1606         }
1607 }
1608
1609 void R_Mesh_ResetTextureState(void)
1610 {
1611         unsigned int unitnum;
1612
1613         BACKENDACTIVECHECK
1614
1615         if (gl_backend_rebindtextures)
1616         {
1617                 gl_backend_rebindtextures = false;
1618                 GL_SetupTextureState();
1619         }
1620
1621         for (unitnum = 0;unitnum < backendimageunits;unitnum++)
1622         {
1623                 gltextureunit_t *unit = gl_state.units + unitnum;
1624                 // update 1d texture binding
1625                 if (unit->t1d)
1626                 {
1627                         GL_ActiveTexture(unitnum);
1628                         if (unitnum < backendunits)
1629                                 qglDisable(GL_TEXTURE_1D);
1630                         unit->t1d = 0;
1631                         qglBindTexture(GL_TEXTURE_1D, unit->t1d);
1632                         CHECKGLERROR
1633                 }
1634                 // update 2d texture binding
1635                 if (unit->t2d)
1636                 {
1637                         GL_ActiveTexture(unitnum);
1638                         if (unitnum < backendunits)
1639                                 qglDisable(GL_TEXTURE_2D);
1640                         unit->t2d = 0;
1641                         qglBindTexture(GL_TEXTURE_2D, unit->t2d);
1642                         CHECKGLERROR
1643                 }
1644                 // update 3d texture binding
1645                 if (unit->t3d)
1646                 {
1647                         GL_ActiveTexture(unitnum);
1648                         if (unitnum < backendunits)
1649                                 qglDisable(GL_TEXTURE_3D);
1650                         unit->t3d = 0;
1651                         qglBindTexture(GL_TEXTURE_3D, unit->t3d);
1652                         CHECKGLERROR
1653                 }
1654                 // update cubemap texture binding
1655                 if (unit->tcubemap)
1656                 {
1657                         GL_ActiveTexture(unitnum);
1658                         if (unitnum < backendunits)
1659                                 qglDisable(GL_TEXTURE_CUBE_MAP_ARB);
1660                         unit->tcubemap = 0;
1661                         qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, unit->tcubemap);
1662                         CHECKGLERROR
1663                 }
1664         }
1665         for (unitnum = 0;unitnum < backendarrayunits;unitnum++)
1666         {
1667                 gltextureunit_t *unit = gl_state.units + unitnum;
1668                 // texture array unit is disabled, disable the array
1669                 if (unit->arrayenabled)
1670                 {
1671                         unit->arrayenabled = false;
1672                         GL_ClientActiveTexture(unitnum);
1673                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
1674                 }
1675         }
1676         for (unitnum = 0;unitnum < backendunits;unitnum++)
1677         {
1678                 gltextureunit_t *unit = gl_state.units + unitnum;
1679                 // no texmatrix specified, revert to identity
1680                 if (unit->texmatrixenabled)
1681                 {
1682                         unit->texmatrixenabled = false;
1683                         qglMatrixMode(GL_TEXTURE);
1684                         GL_ActiveTexture(unitnum);
1685                         qglLoadIdentity();
1686                         qglMatrixMode(GL_MODELVIEW);
1687                 }
1688                 if (gl_combine.integer)
1689                 {
1690                         // GL_ARB_texture_env_combine
1691                         if (unit->combinergb != GL_MODULATE)
1692                         {
1693                                 unit->combinergb = GL_MODULATE;
1694                                 GL_ActiveTexture(unitnum);
1695                                 qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, unit->combinergb);CHECKGLERROR
1696                         }
1697                         if (unit->combinealpha != GL_MODULATE)
1698                         {
1699                                 unit->combinealpha = GL_MODULATE;
1700                                 GL_ActiveTexture(unitnum);
1701                                 qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, unit->combinealpha);CHECKGLERROR
1702                         }
1703                         if (unit->rgbscale != 1)
1704                         {
1705                                 GL_ActiveTexture(unitnum);
1706                                 qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, (unit->rgbscale = 1));CHECKGLERROR
1707                         }
1708                         if (unit->alphascale != 1)
1709                         {
1710                                 GL_ActiveTexture(unitnum);
1711                                 qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, (unit->alphascale = 1));CHECKGLERROR
1712                         }
1713                 }
1714                 else
1715                 {
1716                         // normal GL texenv
1717                         if (unit->combinergb != GL_MODULATE)
1718                         {
1719                                 unit->combinergb = GL_MODULATE;
1720                                 GL_ActiveTexture(unitnum);
1721                                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, unit->combinergb);CHECKGLERROR
1722                         }
1723                 }
1724         }
1725 }
1726
1727 void R_Mesh_Draw_ShowTris(int firstvertex, int numvertices, int numtriangles, const int *elements)
1728 {
1729         qglBegin(GL_LINES);
1730         for (;numtriangles;numtriangles--, elements += 3)
1731         {
1732                 qglArrayElement(elements[0]);qglArrayElement(elements[1]);
1733                 qglArrayElement(elements[1]);qglArrayElement(elements[2]);
1734                 qglArrayElement(elements[2]);qglArrayElement(elements[0]);
1735         }
1736         qglEnd();
1737         CHECKGLERROR
1738 }