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_projectmatrix;
  77
  78 static unsigned int backendunits, backendimageunits, backendarrayunits, backendactive;
  79
  80 /*
  81 note: here's strip order for a terrain row:
  82 0--1--2--3--4
  83 |\ |\ |\ |\ |
  84 | \| \| \| \|
  85 A--B--C--D--E
  86 clockwise
  87
  88 A0B, 01B, B1C, 12C, C2D, 23D, D3E, 34E
  89
  90 *elements++ = i + row;
  91 *elements++ = i;
  92 *elements++ = i + row + 1;
  93 *elements++ = i;
  94 *elements++ = i + 1;
  95 *elements++ = i + row + 1;
  96
  97
  98 for (y = 0;y < rows - 1;y++)
  99 {
 100         for (x = 0;x < columns - 1;x++)
 101         {
 102                 i = y * rows + x;
 103                 *elements++ = i + columns;
 104                 *elements++ = i;
 105                 *elements++ = i + columns + 1;
 106                 *elements++ = i;
 107                 *elements++ = i + 1;
 108                 *elements++ = i + columns + 1;
 109         }
 110 }
 111
 112 alternative:
 113 0--1--2--3--4
 114 | /| /|\ | /|
 115 |/ |/ | \|/ |
 116 A--B--C--D--E
 117 counterclockwise
 118
 119 for (y = 0;y < rows - 1;y++)
 120 {
 121         for (x = 0;x < columns - 1;x++)
 122         {
 123                 i = y * rows + x;
 124                 *elements++ = i;
 125                 *elements++ = i + columns;
 126                 *elements++ = i + columns + 1;
 127                 *elements++ = i + columns;
 128                 *elements++ = i + columns + 1;
 129                 *elements++ = i + 1;
 130         }
 131 }
 132 */
 133
 134 int polygonelements[(POLYGONELEMENTS_MAXPOINTS-2)*3];
 135 int quadelements[QUADELEMENTS_MAXQUADS*6];
 136
 137 void GL_Backend_AllocArrays(void)
 138 {
 139 }
 140
 141 void GL_Backend_FreeArrays(void)
 142 {
 143 }
 144
 145 static void gl_backend_start(void)
 146 {
 147         Con_Print("OpenGL Backend starting...\n");
 148         CHECKGLERROR
 149
 150         if (qglDrawRangeElements != NULL)
 151         {
 152                 CHECKGLERROR
 153                 qglGetIntegerv(GL_MAX_ELEMENTS_VERTICES, &gl_maxdrawrangeelementsvertices);
 154                 CHECKGLERROR
 155                 qglGetIntegerv(GL_MAX_ELEMENTS_INDICES, &gl_maxdrawrangeelementsindices);
 156                 CHECKGLERROR
 157                 Con_Printf("glDrawRangeElements detected (max vertices %i, max indices %i)\n", gl_maxdrawrangeelementsvertices, gl_maxdrawrangeelementsindices);
 158         }
 159
 160         backendunits = bound(1, gl_textureunits, MAX_TEXTUREUNITS);
 161         backendimageunits = backendunits;
 162         backendarrayunits = backendunits;
 163         if (gl_support_fragment_shader)
 164         {
 165                 CHECKGLERROR
 166                 qglGetIntegerv(GL_MAX_TEXTURE_IMAGE_UNITS_ARB, (int *)&backendimageunits);
 167                 CHECKGLERROR
 168                 qglGetIntegerv(GL_MAX_TEXTURE_COORDS_ARB, (int *)&backendarrayunits);
 169                 CHECKGLERROR
 170                 Con_Printf("GLSL shader support detected: texture units = %i texenv, %i image, %i array\n", backendunits, backendimageunits, backendarrayunits);
 171                 backendimageunits = bound(1, backendimageunits, MAX_TEXTUREUNITS);
 172                 backendarrayunits = bound(1, backendarrayunits, MAX_TEXTUREUNITS);
 173         }
 174         else if (backendunits > 1)
 175                 Con_Printf("multitexture detected: texture units = %i\n", backendunits);
 176         else
 177                 Con_Printf("singletexture\n");
 178
 179         GL_Backend_AllocArrays();
 180
 181         Con_Printf("OpenGL backend started.\n");
 182
 183         CHECKGLERROR
 184
 185         backendactive = true;
 186 }
 187
 188 static void gl_backend_shutdown(void)
 189 {
 190         backendunits = 0;
 191         backendimageunits = 0;
 192         backendarrayunits = 0;
 193         backendactive = false;
 194
 195         Con_Print("OpenGL Backend shutting down\n");
 196
 197         GL_Backend_FreeArrays();
 198 }
 199
 200 static void gl_backend_newmap(void)
 201 {
 202 }
 203
 204 void gl_backend_init(void)
 205 {
 206         int i;
 207
 208         for (i = 0;i < POLYGONELEMENTS_MAXPOINTS - 2;i++)
 209         {
 210                 polygonelements[i * 3 + 0] = 0;
 211                 polygonelements[i * 3 + 1] = i + 1;
 212                 polygonelements[i * 3 + 2] = i + 2;
 213         }
 214         // elements for rendering a series of quads as triangles
 215         for (i = 0;i < QUADELEMENTS_MAXQUADS;i++)
 216         {
 217                 quadelements[i * 6 + 0] = i * 4;
 218                 quadelements[i * 6 + 1] = i * 4 + 1;
 219                 quadelements[i * 6 + 2] = i * 4 + 2;
 220                 quadelements[i * 6 + 3] = i * 4;
 221                 quadelements[i * 6 + 4] = i * 4 + 2;
 222                 quadelements[i * 6 + 5] = i * 4 + 3;
 223         }
 224
 225         Cvar_RegisterVariable(&r_render);
 226         Cvar_RegisterVariable(&r_waterwarp);
 227         Cvar_RegisterVariable(&gl_polyblend);
 228         Cvar_RegisterVariable(&gl_dither);
 229         Cvar_RegisterVariable(&gl_lockarrays);
 230         Cvar_RegisterVariable(&gl_paranoid);
 231         Cvar_RegisterVariable(&gl_printcheckerror);
 232 #ifdef NORENDER
 233         Cvar_SetValue("r_render", 0);
 234 #endif
 235
 236         Cvar_RegisterVariable(&gl_mesh_drawrangeelements);
 237         Cvar_RegisterVariable(&gl_mesh_testarrayelement);
 238         Cvar_RegisterVariable(&gl_mesh_testmanualfeeding);
 239
 240         R_RegisterModule("GL_Backend", gl_backend_start, gl_backend_shutdown, gl_backend_newmap);
 241 }
 242
 243 void GL_SetupView_Orientation_Identity (void)
 244 {
 245         backend_viewmatrix = identitymatrix;
 246         memset(&backend_modelmatrix, 0, sizeof(backend_modelmatrix));
 247 }
 248
 249 void GL_SetupView_Orientation_FromEntity(const matrix4x4_t *matrix)
 250 {
 251         matrix4x4_t tempmatrix, basematrix;
 252         Matrix4x4_Invert_Simple(&tempmatrix, matrix);
 253         Matrix4x4_CreateRotate(&basematrix, -90, 1, 0, 0);
 254         Matrix4x4_ConcatRotate(&basematrix, 90, 0, 0, 1);
 255         Matrix4x4_Concat(&backend_viewmatrix, &basematrix, &tempmatrix);
 256         //Matrix4x4_ConcatRotate(&backend_viewmatrix, -angles[2], 1, 0, 0);
 257         //Matrix4x4_ConcatRotate(&backend_viewmatrix, -angles[0], 0, 1, 0);
 258         //Matrix4x4_ConcatRotate(&backend_viewmatrix, -angles[1], 0, 0, 1);
 259         //Matrix4x4_ConcatTranslate(&backend_viewmatrix, -origin[0], -origin[1], -origin[2]);
 260         memset(&backend_modelmatrix, 0, sizeof(backend_modelmatrix));
 261 }
 262
 263 void GL_SetupView_Mode_Perspective (double frustumx, double frustumy, double zNear, double zFar)
 264 {
 265         double m[16];
 266
 267         // set up viewpoint
 268         CHECKGLERROR
 269         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 270         qglLoadIdentity();CHECKGLERROR
 271         // set view pyramid
 272         qglFrustum(-frustumx * zNear, frustumx * zNear, -frustumy * zNear, frustumy * zNear, zNear, zFar);CHECKGLERROR
 273         qglGetDoublev(GL_PROJECTION_MATRIX, m);CHECKGLERROR
 274         Matrix4x4_FromArrayDoubleGL(&backend_projectmatrix, m);
 275         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 276         GL_SetupView_Orientation_Identity();
 277         CHECKGLERROR
 278 }
 279
 280 void GL_SetupView_Mode_PerspectiveInfiniteFarClip (double frustumx, double frustumy, double zNear)
 281 {
 282         double nudge, m[16];
 283
 284         // set up viewpoint
 285         CHECKGLERROR
 286         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 287         qglLoadIdentity();CHECKGLERROR
 288         // set view pyramid
 289         nudge = 1.0 - 1.0 / (1<<23);
 290         m[ 0] = 1.0 / frustumx;
 291         m[ 1] = 0;
 292         m[ 2] = 0;
 293         m[ 3] = 0;
 294         m[ 4] = 0;
 295         m[ 5] = 1.0 / frustumy;
 296         m[ 6] = 0;
 297         m[ 7] = 0;
 298         m[ 8] = 0;
 299         m[ 9] = 0;
 300         m[10] = -nudge;
 301         m[11] = -1;
 302         m[12] = 0;
 303         m[13] = 0;
 304         m[14] = -2 * zNear * nudge;
 305         m[15] = 0;
 306         qglLoadMatrixd(m);CHECKGLERROR
 307         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 308         GL_SetupView_Orientation_Identity();
 309         CHECKGLERROR
 310         Matrix4x4_FromArrayDoubleGL(&backend_projectmatrix, m);
 311 }
 312
 313 void GL_SetupView_Mode_Ortho (double x1, double y1, double x2, double y2, double zNear, double zFar)
 314 {
 315         double m[16];
 316
 317         // set up viewpoint
 318         CHECKGLERROR
 319         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 320         qglLoadIdentity();CHECKGLERROR
 321         qglOrtho(x1, x2, y2, y1, zNear, zFar);CHECKGLERROR
 322         qglGetDoublev(GL_PROJECTION_MATRIX, m);CHECKGLERROR
 323         Matrix4x4_FromArrayDoubleGL(&backend_projectmatrix, m);
 324         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 325         GL_SetupView_Orientation_Identity();
 326         CHECKGLERROR
 327 }
 328
 329 typedef struct gltextureunit_s
 330 {
 331         int t1d, t2d, t3d, tcubemap;
 332         int arrayenabled;
 333         unsigned int arraycomponents;
 334         const void *pointer_texcoord;
 335         int rgbscale, alphascale;
 336         int combinergb, combinealpha;
 337         // FIXME: add more combine stuff
 338         // texmatrixenabled exists only to avoid unnecessary texmatrix compares
 339         int texmatrixenabled;
 340         matrix4x4_t matrix;
 341 }
 342 gltextureunit_t;
 343
 344 static struct gl_state_s
 345 {
 346         int cullface;
 347         int cullfaceenable;
 348         int blendfunc1;
 349         int blendfunc2;
 350         int blend;
 351         GLboolean depthmask;
 352         int colormask; // stored as bottom 4 bits: r g b a (3 2 1 0 order)
 353         int depthtest;
 354         int alphatest;
 355         int scissortest;
 356         unsigned int unit;
 357         unsigned int clientunit;
 358         gltextureunit_t units[MAX_TEXTUREUNITS];
 359         float color4f[4];
 360         int lockrange_first;
 361         int lockrange_count;
 362         const void *pointer_vertex;
 363         const void *pointer_color;
 364 }
 365 gl_state;
 366
 367 void GL_SetupTextureState(void)
 368 {
 369         unsigned int i;
 370         gltextureunit_t *unit;
 371         CHECKGLERROR
 372         gl_state.unit = MAX_TEXTUREUNITS;
 373         gl_state.clientunit = MAX_TEXTUREUNITS;
 374         for (i = 0;i < MAX_TEXTUREUNITS;i++)
 375         {
 376                 unit = gl_state.units + i;
 377                 unit->t1d = 0;
 378                 unit->t2d = 0;
 379                 unit->t3d = 0;
 380                 unit->tcubemap = 0;
 381                 unit->arrayenabled = false;
 382                 unit->arraycomponents = 0;
 383                 unit->pointer_texcoord = NULL;
 384                 unit->rgbscale = 1;
 385                 unit->alphascale = 1;
 386                 unit->combinergb = GL_MODULATE;
 387                 unit->combinealpha = GL_MODULATE;
 388                 unit->texmatrixenabled = false;
 389                 unit->matrix = identitymatrix;
 390         }
 391
 392         for (i = 0;i < backendimageunits;i++)
 393         {
 394                 GL_ActiveTexture(i);
 395                 qglBindTexture(GL_TEXTURE_1D, 0);CHECKGLERROR
 396                 qglBindTexture(GL_TEXTURE_2D, 0);CHECKGLERROR
 397                 if (gl_texture3d)
 398                 {
 399                         qglBindTexture(GL_TEXTURE_3D, 0);CHECKGLERROR
 400                 }
 401                 if (gl_texturecubemap)
 402                 {
 403                         qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, 0);CHECKGLERROR
 404                 }
 405         }
 406
 407         for (i = 0;i < backendarrayunits;i++)
 408         {
 409                 GL_ClientActiveTexture(i);
 410                 qglTexCoordPointer(2, GL_FLOAT, sizeof(float[2]), NULL);CHECKGLERROR
 411                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 412         }
 413
 414         for (i = 0;i < backendunits;i++)
 415         {
 416                 GL_ActiveTexture(i);
 417                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 418                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 419                 if (gl_texture3d)
 420                 {
 421                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 422                 }
 423                 if (gl_texturecubemap)
 424                 {
 425                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 426                 }
 427                 qglMatrixMode(GL_TEXTURE);CHECKGLERROR
 428                 qglLoadIdentity();CHECKGLERROR
 429                 qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 430                 if (gl_combine.integer)
 431                 {
 432                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);CHECKGLERROR
 433                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_MODULATE);CHECKGLERROR
 434                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE);CHECKGLERROR
 435                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 436                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_RGB_ARB, GL_TEXTURE);CHECKGLERROR // for GL_INTERPOLATE_ARB mode
 437                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 438                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 439                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_RGB_ARB, GL_SRC_ALPHA);CHECKGLERROR
 440                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, GL_MODULATE);CHECKGLERROR
 441                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA_ARB, GL_TEXTURE);CHECKGLERROR
 442                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_ALPHA_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 443                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_ALPHA_ARB, GL_CONSTANT_ARB);CHECKGLERROR
 444                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 445                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 446                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 447                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
 448                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
 449                 }
 450                 else
 451                 {
 452                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 453                 }
 454                 CHECKGLERROR
 455         }
 456         CHECKGLERROR
 457 }
 458
 459 void GL_Backend_ResetState(void)
 460 {
 461         memset(&gl_state, 0, sizeof(gl_state));
 462         gl_state.depthtest = true;
 463         gl_state.alphatest = false;
 464         gl_state.blendfunc1 = GL_ONE;
 465         gl_state.blendfunc2 = GL_ZERO;
 466         gl_state.blend = false;
 467         gl_state.depthmask = GL_TRUE;
 468         gl_state.colormask = 15;
 469         gl_state.color4f[0] = gl_state.color4f[1] = gl_state.color4f[2] = gl_state.color4f[3] = 1;
 470         gl_state.lockrange_first = 0;
 471         gl_state.lockrange_count = 0;
 472         gl_state.pointer_vertex = NULL;
 473         gl_state.pointer_color = NULL;
 474         gl_state.cullface = GL_FRONT; // quake is backwards, this culls back faces
 475         gl_state.cullfaceenable = true;
 476
 477         CHECKGLERROR
 478
 479         qglColorMask(1, 1, 1, 1);
 480         qglAlphaFunc(GL_GEQUAL, 0.5);CHECKGLERROR
 481         qglDisable(GL_ALPHA_TEST);CHECKGLERROR
 482         qglBlendFunc(gl_state.blendfunc1, gl_state.blendfunc2);CHECKGLERROR
 483         qglDisable(GL_BLEND);CHECKGLERROR
 484         qglCullFace(gl_state.cullface);CHECKGLERROR
 485         qglEnable(GL_CULL_FACE);CHECKGLERROR
 486         qglDepthFunc(GL_LEQUAL);CHECKGLERROR
 487         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 488         qglDepthMask(gl_state.depthmask);CHECKGLERROR
 489
 490         qglVertexPointer(3, GL_FLOAT, sizeof(float[3]), NULL);CHECKGLERROR
 491         qglEnableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 492
 493         qglColorPointer(4, GL_FLOAT, sizeof(float[4]), NULL);CHECKGLERROR
 494         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 495
 496         GL_Color(0, 0, 0, 0);
 497         GL_Color(1, 1, 1, 1);
 498
 499         GL_SetupTextureState();
 500 }
 501
 502 void GL_ActiveTexture(unsigned int num)
 503 {
 504         if (gl_state.unit != num)
 505         {
 506                 gl_state.unit = num;
 507                 if (qglActiveTexture)
 508                 {
 509                         CHECKGLERROR
 510                         qglActiveTexture(GL_TEXTURE0_ARB + gl_state.unit);
 511                         CHECKGLERROR
 512                 }
 513         }
 514 }
 515
 516 void GL_ClientActiveTexture(unsigned int num)
 517 {
 518         if (gl_state.clientunit != num)
 519         {
 520                 gl_state.clientunit = num;
 521                 if (qglActiveTexture)
 522                 {
 523                         CHECKGLERROR
 524                         qglClientActiveTexture(GL_TEXTURE0_ARB + gl_state.clientunit);
 525                         CHECKGLERROR
 526                 }
 527         }
 528 }
 529
 530 void GL_BlendFunc(int blendfunc1, int blendfunc2)
 531 {
 532         if (gl_state.blendfunc1 != blendfunc1 || gl_state.blendfunc2 != blendfunc2)
 533         {
 534                 CHECKGLERROR
 535                 qglBlendFunc(gl_state.blendfunc1 = blendfunc1, gl_state.blendfunc2 = blendfunc2);CHECKGLERROR
 536                 if (gl_state.blendfunc2 == GL_ZERO)
 537                 {
 538                         if (gl_state.blendfunc1 == GL_ONE)
 539                         {
 540                                 if (gl_state.blend)
 541                                 {
 542                                         gl_state.blend = 0;
 543                                         qglDisable(GL_BLEND);CHECKGLERROR
 544                                 }
 545                         }
 546                         else
 547                         {
 548                                 if (!gl_state.blend)
 549                                 {
 550                                         gl_state.blend = 1;
 551                                         qglEnable(GL_BLEND);CHECKGLERROR
 552                                 }
 553                         }
 554                 }
 555                 else
 556                 {
 557                         if (!gl_state.blend)
 558                         {
 559                                 gl_state.blend = 1;
 560                                 qglEnable(GL_BLEND);CHECKGLERROR
 561                         }
 562                 }
 563         }
 564 }
 565
 566 void GL_DepthMask(int state)
 567 {
 568         if (gl_state.depthmask != state)
 569         {
 570                 CHECKGLERROR
 571                 qglDepthMask(gl_state.depthmask = state);CHECKGLERROR
 572         }
 573 }
 574
 575 void GL_DepthTest(int state)
 576 {
 577         if (gl_state.depthtest != state)
 578         {
 579                 gl_state.depthtest = state;
 580                 CHECKGLERROR
 581                 if (gl_state.depthtest)
 582                 {
 583                         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 584                 }
 585                 else
 586                 {
 587                         qglDisable(GL_DEPTH_TEST);CHECKGLERROR
 588                 }
 589         }
 590 }
 591
 592 void GL_CullFace(int state)
 593 {
 594         CHECKGLERROR
 595         if (state != GL_NONE)
 596         {
 597                 if (!gl_state.cullfaceenable)
 598                 {
 599                         gl_state.cullfaceenable = true;
 600                         qglEnable(GL_CULL_FACE);CHECKGLERROR
 601                 }
 602                 if (gl_state.cullface != state)
 603                 {
 604                         gl_state.cullface = state;
 605                         qglCullFace(gl_state.cullface);CHECKGLERROR
 606                 }
 607         }
 608         else
 609         {
 610                 if (gl_state.cullfaceenable)
 611                 {
 612                         gl_state.cullfaceenable = false;
 613                         qglDisable(GL_CULL_FACE);CHECKGLERROR
 614                 }
 615         }
 616 }
 617
 618 void GL_AlphaTest(int state)
 619 {
 620         if (gl_state.alphatest != state)
 621         {
 622                 gl_state.alphatest = state;
 623                 CHECKGLERROR
 624                 if (gl_state.alphatest)
 625                 {
 626                         qglEnable(GL_ALPHA_TEST);CHECKGLERROR
 627                 }
 628                 else
 629                 {
 630                         qglDisable(GL_ALPHA_TEST);CHECKGLERROR
 631                 }
 632         }
 633 }
 634
 635 void GL_ColorMask(int r, int g, int b, int a)
 636 {
 637         int state = r*8 + g*4 + b*2 + a*1;
 638         if (gl_state.colormask != state)
 639         {
 640                 gl_state.colormask = state;
 641                 CHECKGLERROR
 642                 qglColorMask((GLboolean)r, (GLboolean)g, (GLboolean)b, (GLboolean)a);CHECKGLERROR
 643         }
 644 }
 645
 646 void GL_Color(float cr, float cg, float cb, float ca)
 647 {
 648         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)
 649         {
 650                 gl_state.color4f[0] = cr;
 651                 gl_state.color4f[1] = cg;
 652                 gl_state.color4f[2] = cb;
 653                 gl_state.color4f[3] = ca;
 654                 CHECKGLERROR
 655                 qglColor4f(gl_state.color4f[0], gl_state.color4f[1], gl_state.color4f[2], gl_state.color4f[3]);
 656                 CHECKGLERROR
 657         }
 658 }
 659
 660 void GL_LockArrays(int first, int count)
 661 {
 662         if (gl_state.lockrange_count != count || gl_state.lockrange_first != first)
 663         {
 664                 if (gl_state.lockrange_count)
 665                 {
 666                         gl_state.lockrange_count = 0;
 667                         CHECKGLERROR
 668                         qglUnlockArraysEXT();
 669                         CHECKGLERROR
 670                 }
 671                 if (count && gl_supportslockarrays && gl_lockarrays.integer && r_render.integer)
 672                 {
 673                         gl_state.lockrange_first = first;
 674                         gl_state.lockrange_count = count;
 675                         CHECKGLERROR
 676                         qglLockArraysEXT(first, count);
 677                         CHECKGLERROR
 678                 }
 679         }
 680 }
 681
 682 void GL_Scissor (int x, int y, int width, int height)
 683 {
 684         CHECKGLERROR
 685         qglScissor(x, vid.height - (y + height),width,height);
 686         CHECKGLERROR
 687 }
 688
 689 void GL_ScissorTest(int state)
 690 {
 691         if(gl_state.scissortest == state)
 692                 return;
 693
 694         CHECKGLERROR
 695         if((gl_state.scissortest = state))
 696                 qglEnable(GL_SCISSOR_TEST);
 697         else
 698                 qglDisable(GL_SCISSOR_TEST);
 699         CHECKGLERROR
 700 }
 701
 702 void GL_Clear(int mask)
 703 {
 704         CHECKGLERROR
 705         qglClear(mask);CHECKGLERROR
 706 }
 707
 708 void GL_TransformToScreen(const vec4_t in, vec4_t out)
 709 {
 710         vec4_t temp;
 711         float iw;
 712         Matrix4x4_Transform4 (&backend_viewmatrix, in, temp);
 713         Matrix4x4_Transform4 (&backend_projectmatrix, temp, out);
 714         iw = 1.0f / out[3];
 715         out[0] = r_view.x + (out[0] * iw + 1.0f) * r_view.width * 0.5f;
 716         out[1] = r_view.y + r_view.height - (out[1] * iw + 1.0f) * r_view.height * 0.5f;
 717         out[2] = r_view.z + (out[2] * iw + 1.0f) * r_view.depth * 0.5f;
 718 }
 719
 720 // called at beginning of frame
 721 void R_Mesh_Start(void)
 722 {
 723         BACKENDACTIVECHECK
 724         CHECKGLERROR
 725         if (gl_printcheckerror.integer && !gl_paranoid.integer)
 726         {
 727                 Con_Printf("WARNING: gl_printcheckerror is on but gl_paranoid is off, turning it on...\n");
 728                 Cvar_SetValueQuick(&gl_paranoid, 1);
 729         }
 730         GL_Backend_ResetState();
 731 }
 732
 733 unsigned int GL_Backend_CompileProgram(int vertexstrings_count, const char **vertexstrings_list, int fragmentstrings_count, const char **fragmentstrings_list)
 734 {
 735         GLint vertexshadercompiled, fragmentshadercompiled, programlinked;
 736         GLuint vertexshaderobject, fragmentshaderobject, programobject = 0;
 737         char compilelog[MAX_INPUTLINE];
 738         CHECKGLERROR
 739
 740         programobject = qglCreateProgramObjectARB();CHECKGLERROR
 741         if (!programobject)
 742                 return 0;
 743
 744         if (developer.integer >= 100)
 745         {
 746                 int i;
 747                 Con_Printf("Compiling shader:\n");
 748                 if (vertexstrings_count)
 749                 {
 750                         Con_Printf("------ VERTEX SHADER ------\n");
 751                         for (i = 0;i < vertexstrings_count;i++)
 752                                 Con_Print(vertexstrings_list[i]);
 753                         Con_Print("\n");
 754                 }
 755                 if (fragmentstrings_count)
 756                 {
 757                         Con_Printf("------ FRAGMENT SHADER ------\n");
 758                         for (i = 0;i < fragmentstrings_count;i++)
 759                                 Con_Print(fragmentstrings_list[i]);
 760                         Con_Print("\n");
 761                 }
 762         }
 763
 764         if (vertexstrings_count)
 765         {
 766                 vertexshaderobject = qglCreateShaderObjectARB(GL_VERTEX_SHADER_ARB);CHECKGLERROR
 767                 if (!vertexshaderobject)
 768                 {
 769                         qglDeleteObjectARB(programobject);
 770                         CHECKGLERROR
 771                         return 0;
 772                 }
 773                 qglShaderSourceARB(vertexshaderobject, vertexstrings_count, vertexstrings_list, NULL);CHECKGLERROR
 774                 qglCompileShaderARB(vertexshaderobject);CHECKGLERROR
 775                 qglGetObjectParameterivARB(vertexshaderobject, GL_OBJECT_COMPILE_STATUS_ARB, &vertexshadercompiled);CHECKGLERROR
 776                 qglGetInfoLogARB(vertexshaderobject, sizeof(compilelog), NULL, compilelog);CHECKGLERROR
 777                 if (compilelog[0])
 778                         Con_DPrintf("vertex shader compile log:\n%s\n", compilelog);
 779                 if (!vertexshadercompiled)
 780                 {
 781                         qglDeleteObjectARB(programobject);CHECKGLERROR
 782                         qglDeleteObjectARB(vertexshaderobject);CHECKGLERROR
 783                         return 0;
 784                 }
 785                 qglAttachObjectARB(programobject, vertexshaderobject);CHECKGLERROR
 786                 qglDeleteObjectARB(vertexshaderobject);CHECKGLERROR
 787         }
 788
 789         if (fragmentstrings_count)
 790         {
 791                 fragmentshaderobject = qglCreateShaderObjectARB(GL_FRAGMENT_SHADER_ARB);CHECKGLERROR
 792                 if (!fragmentshaderobject)
 793                 {
 794                         qglDeleteObjectARB(programobject);CHECKGLERROR
 795                         return 0;
 796                 }
 797                 qglShaderSourceARB(fragmentshaderobject, fragmentstrings_count, fragmentstrings_list, NULL);CHECKGLERROR
 798                 qglCompileShaderARB(fragmentshaderobject);CHECKGLERROR
 799                 qglGetObjectParameterivARB(fragmentshaderobject, GL_OBJECT_COMPILE_STATUS_ARB, &fragmentshadercompiled);CHECKGLERROR
 800                 qglGetInfoLogARB(fragmentshaderobject, sizeof(compilelog), NULL, compilelog);CHECKGLERROR
 801                 if (compilelog[0])
 802                         Con_DPrintf("fragment shader compile log:\n%s\n", compilelog);
 803                 if (!fragmentshadercompiled)
 804                 {
 805                         qglDeleteObjectARB(programobject);CHECKGLERROR
 806                         qglDeleteObjectARB(fragmentshaderobject);CHECKGLERROR
 807                         return 0;
 808                 }
 809                 qglAttachObjectARB(programobject, fragmentshaderobject);CHECKGLERROR
 810                 qglDeleteObjectARB(fragmentshaderobject);CHECKGLERROR
 811         }
 812
 813         qglLinkProgramARB(programobject);CHECKGLERROR
 814         qglGetObjectParameterivARB(programobject, GL_OBJECT_LINK_STATUS_ARB, &programlinked);CHECKGLERROR
 815         qglGetInfoLogARB(programobject, sizeof(compilelog), NULL, compilelog);CHECKGLERROR
 816         if (compilelog[0])
 817         {
 818                 Con_DPrintf("program link log:\n%s\n", compilelog);
 819                 // software vertex shader is ok but software fragment shader is WAY
 820                 // too slow, fail program if so.
 821                 // NOTE: this string might be ATI specific, but that's ok because the
 822                 // ATI R300 chip (Radeon 9500-9800/X300) is the most likely to use a
 823                 // software fragment shader due to low instruction and dependent
 824                 // texture limits.
 825                 if (strstr(compilelog, "fragment shader will run in software"))
 826                         programlinked = false;
 827         }
 828         if (!programlinked)
 829         {
 830                 qglDeleteObjectARB(programobject);CHECKGLERROR
 831                 return 0;
 832         }
 833         CHECKGLERROR
 834         return programobject;
 835 }
 836
 837 void GL_Backend_FreeProgram(unsigned int prog)
 838 {
 839         CHECKGLERROR
 840         qglDeleteObjectARB(prog);
 841         CHECKGLERROR
 842 }
 843
 844 int gl_backend_rebindtextures;
 845
 846 void GL_Backend_RenumberElements(int *out, int count, const int *in, int offset)
 847 {
 848         int i;
 849         if (offset)
 850         {
 851                 for (i = 0;i < count;i++)
 852                         *out++ = *in++ + offset;
 853         }
 854         else
 855                 memcpy(out, in, sizeof(*out) * count);
 856 }
 857
 858 // renders triangles using vertices from the active arrays
 859 int paranoidblah = 0;
 860 void R_Mesh_Draw(int firstvertex, int numvertices, int numtriangles, const int *elements)
 861 {
 862         unsigned int numelements = numtriangles * 3;
 863         if (numvertices < 3 || numtriangles < 1)
 864         {
 865                 Con_Printf("R_Mesh_Draw(%d, %d, %d, %8p);\n", firstvertex, numvertices, numtriangles, elements);
 866                 return;
 867         }
 868         CHECKGLERROR
 869         r_refdef.stats.meshes++;
 870         r_refdef.stats.meshes_elements += numelements;
 871         if (gl_paranoid.integer)
 872         {
 873                 unsigned int i, j, size;
 874                 const int *p;
 875                 if (!qglIsEnabled(GL_VERTEX_ARRAY))
 876                         Con_Print("R_Mesh_Draw: vertex array not enabled\n");
 877                 CHECKGLERROR
 878                 for (j = 0, size = numvertices * 3, p = (int *)((float *)gl_state.pointer_vertex + firstvertex * 3);j < size;j++, p++)
 879                         paranoidblah += *p;
 880                 if (gl_state.pointer_color)
 881                 {
 882                         if (!qglIsEnabled(GL_COLOR_ARRAY))
 883                                 Con_Print("R_Mesh_Draw: color array set but not enabled\n");
 884                         CHECKGLERROR
 885                         for (j = 0, size = numvertices * 4, p = (int *)((float *)gl_state.pointer_color + firstvertex * 4);j < size;j++, p++)
 886                                 paranoidblah += *p;
 887                 }
 888                 for (i = 0;i < backendarrayunits;i++)
 889                 {
 890                         if (gl_state.units[i].arrayenabled)
 891                         {
 892                                 GL_ClientActiveTexture(i);
 893                                 if (!qglIsEnabled(GL_TEXTURE_COORD_ARRAY))
 894                                         Con_Print("R_Mesh_Draw: texcoord array set but not enabled\n");
 895                                 CHECKGLERROR
 896                                 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++)
 897                                         paranoidblah += *p;
 898                         }
 899                 }
 900                 for (i = 0;i < (unsigned int) numtriangles * 3;i++)
 901                 {
 902                         if (elements[i] < firstvertex || elements[i] >= firstvertex + numvertices)
 903                         {
 904                                 Con_Printf("R_Mesh_Draw: invalid vertex index %i (outside range %i - %i) in elements list\n", elements[i], firstvertex, firstvertex + numvertices);
 905                                 return;
 906                         }
 907                 }
 908                 CHECKGLERROR
 909         }
 910         if (r_render.integer)
 911         {
 912                 CHECKGLERROR
 913                 if (gl_mesh_testmanualfeeding.integer)
 914                 {
 915                         unsigned int i, j;
 916                         const GLfloat *p;
 917                         qglBegin(GL_TRIANGLES);
 918                         for (i = 0;i < (unsigned int) numtriangles * 3;i++)
 919                         {
 920                                 for (j = 0;j < backendarrayunits;j++)
 921                                 {
 922                                         if (gl_state.units[j].pointer_texcoord)
 923                                         {
 924                                                 if (backendarrayunits > 1)
 925                                                 {
 926                                                         if (gl_state.units[j].arraycomponents == 4)
 927                                                         {
 928                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 4;
 929                                                                 qglMultiTexCoord4f(GL_TEXTURE0_ARB + j, p[0], p[1], p[2], p[3]);
 930                                                         }
 931                                                         else if (gl_state.units[j].arraycomponents == 3)
 932                                                         {
 933                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 3;
 934                                                                 qglMultiTexCoord3f(GL_TEXTURE0_ARB + j, p[0], p[1], p[2]);
 935                                                         }
 936                                                         else if (gl_state.units[j].arraycomponents == 2)
 937                                                         {
 938                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 2;
 939                                                                 qglMultiTexCoord2f(GL_TEXTURE0_ARB + j, p[0], p[1]);
 940                                                         }
 941                                                         else
 942                                                         {
 943                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 1;
 944                                                                 qglMultiTexCoord1f(GL_TEXTURE0_ARB + j, p[0]);
 945                                                         }
 946                                                 }
 947                                                 else
 948                                                 {
 949                                                         if (gl_state.units[j].arraycomponents == 4)
 950                                                         {
 951                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 4;
 952                                                                 qglTexCoord4f(p[0], p[1], p[2], p[3]);
 953                                                         }
 954                                                         else if (gl_state.units[j].arraycomponents == 3)
 955                                                         {
 956                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 3;
 957                                                                 qglTexCoord3f(p[0], p[1], p[2]);
 958                                                         }
 959                                                         else if (gl_state.units[j].arraycomponents == 2)
 960                                                         {
 961                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 2;
 962                                                                 qglTexCoord2f(p[0], p[1]);
 963                                                         }
 964                                                         else
 965                                                         {
 966                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 1;
 967                                                                 qglTexCoord1f(p[0]);
 968                                                         }
 969                                                 }
 970                                         }
 971                                 }
 972                                 if (gl_state.pointer_color)
 973                                 {
 974                                         p = ((const GLfloat *)(gl_state.pointer_color)) + elements[i] * 4;
 975                                         qglColor4f(p[0], p[1], p[2], p[3]);
 976                                 }
 977                                 p = ((const GLfloat *)(gl_state.pointer_vertex)) + elements[i] * 3;
 978                                 qglVertex3f(p[0], p[1], p[2]);
 979                         }
 980                         qglEnd();
 981                         CHECKGLERROR
 982                 }
 983                 else if (gl_mesh_testarrayelement.integer)
 984                 {
 985                         int i;
 986                         qglBegin(GL_TRIANGLES);
 987                         for (i = 0;i < numtriangles * 3;i++)
 988                         {
 989                                 qglArrayElement(elements[i]);
 990                         }
 991                         qglEnd();
 992                         CHECKGLERROR
 993                 }
 994                 else if (gl_mesh_drawrangeelements.integer && qglDrawRangeElements != NULL)
 995                 {
 996                         qglDrawRangeElements(GL_TRIANGLES, firstvertex, firstvertex + numvertices, numelements, GL_UNSIGNED_INT, elements);
 997                         CHECKGLERROR
 998                 }
 999                 else
1000                 {
1001                         qglDrawElements(GL_TRIANGLES, numelements, GL_UNSIGNED_INT, elements);
1002                         CHECKGLERROR
1003                 }
1004         }
1005 }
1006
1007 // restores backend state, used when done with 3D rendering
1008 void R_Mesh_Finish(void)
1009 {
1010         unsigned int i;
1011         BACKENDACTIVECHECK
1012         CHECKGLERROR
1013         GL_LockArrays(0, 0);
1014         CHECKGLERROR
1015
1016         for (i = 0;i < backendimageunits;i++)
1017         {
1018                 GL_ActiveTexture(i);
1019                 qglBindTexture(GL_TEXTURE_1D, 0);CHECKGLERROR
1020                 qglBindTexture(GL_TEXTURE_2D, 0);CHECKGLERROR
1021                 if (gl_texture3d)
1022                 {
1023                         qglBindTexture(GL_TEXTURE_3D, 0);CHECKGLERROR
1024                 }
1025                 if (gl_texturecubemap)
1026                 {
1027                         qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, 0);CHECKGLERROR
1028                 }
1029         }
1030         for (i = 0;i < backendarrayunits;i++)
1031         {
1032                 GL_ActiveTexture(backendarrayunits - 1 - i);
1033                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
1034         }
1035         for (i = 0;i < backendunits;i++)
1036         {
1037                 GL_ActiveTexture(backendunits - 1 - i);
1038                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
1039                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
1040                 if (gl_texture3d)
1041                 {
1042                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
1043                 }
1044                 if (gl_texturecubemap)
1045                 {
1046                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
1047                 }
1048                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
1049                 if (gl_combine.integer)
1050                 {
1051                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
1052                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
1053                 }
1054         }
1055         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
1056         qglDisableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
1057
1058         qglDisable(GL_BLEND);CHECKGLERROR
1059         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
1060         qglDepthMask(GL_TRUE);CHECKGLERROR
1061         qglBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);CHECKGLERROR
1062 }
1063
1064 void R_Mesh_Matrix(const matrix4x4_t *matrix)
1065 {
1066         if (memcmp(matrix, &backend_modelmatrix, sizeof(matrix4x4_t)))
1067         {
1068                 double glmatrix[16];
1069                 backend_modelmatrix = *matrix;
1070                 Matrix4x4_Concat(&backend_modelviewmatrix, &backend_viewmatrix, matrix);
1071                 Matrix4x4_ToArrayDoubleGL(&backend_modelviewmatrix, glmatrix);
1072                 CHECKGLERROR
1073                 qglLoadMatrixd(glmatrix);CHECKGLERROR
1074         }
1075 }
1076
1077 void R_Mesh_VertexPointer(const float *vertex3f)
1078 {
1079         if (gl_state.pointer_vertex != vertex3f)
1080         {
1081                 gl_state.pointer_vertex = vertex3f;
1082                 CHECKGLERROR
1083                 qglVertexPointer(3, GL_FLOAT, sizeof(float[3]), gl_state.pointer_vertex);
1084                 CHECKGLERROR
1085         }
1086 }
1087
1088 void R_Mesh_ColorPointer(const float *color4f)
1089 {
1090         if (gl_state.pointer_color != color4f)
1091         {
1092                 CHECKGLERROR
1093                 if (!gl_state.pointer_color)
1094                 {
1095                         qglEnableClientState(GL_COLOR_ARRAY);CHECKGLERROR
1096                 }
1097                 else if (!color4f)
1098                 {
1099                         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
1100                         // when color array is on the glColor gets trashed, set it again
1101                         qglColor4f(gl_state.color4f[0], gl_state.color4f[1], gl_state.color4f[2], gl_state.color4f[3]);CHECKGLERROR
1102                 }
1103                 gl_state.pointer_color = color4f;
1104                 qglColorPointer(4, GL_FLOAT, sizeof(float[4]), gl_state.pointer_color);CHECKGLERROR
1105         }
1106 }
1107
1108 void R_Mesh_TexCoordPointer(unsigned int unitnum, unsigned int numcomponents, const float *texcoord)
1109 {
1110         gltextureunit_t *unit = gl_state.units + unitnum;
1111         // update array settings
1112         CHECKGLERROR
1113         if (texcoord)
1114         {
1115                 // texcoord array
1116                 if (unit->pointer_texcoord != texcoord || unit->arraycomponents != numcomponents)
1117                 {
1118                         unit->pointer_texcoord = texcoord;
1119                         unit->arraycomponents = numcomponents;
1120                         GL_ClientActiveTexture(unitnum);
1121                         qglTexCoordPointer(unit->arraycomponents, GL_FLOAT, sizeof(float) * unit->arraycomponents, unit->pointer_texcoord);CHECKGLERROR
1122                 }
1123                 // texture array unit is enabled, enable the array
1124                 if (!unit->arrayenabled)
1125                 {
1126                         unit->arrayenabled = true;
1127                         GL_ClientActiveTexture(unitnum);
1128                         qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
1129                 }
1130         }
1131         else
1132         {
1133                 // texture array unit is disabled, disable the array
1134                 if (unit->arrayenabled)
1135                 {
1136                         unit->arrayenabled = false;
1137                         GL_ClientActiveTexture(unitnum);
1138                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
1139                 }
1140         }
1141 }
1142
1143 void R_Mesh_TexBindAll(unsigned int unitnum, int tex1d, int tex2d, int tex3d, int texcubemap)
1144 {
1145         gltextureunit_t *unit = gl_state.units + unitnum;
1146         if (unitnum >= backendimageunits)
1147                 return;
1148         // update 1d texture binding
1149         if (unit->t1d != tex1d)
1150         {
1151                 GL_ActiveTexture(unitnum);
1152                 if (unitnum < backendunits)
1153                 {
1154                         if (tex1d)
1155                         {
1156                                 if (unit->t1d == 0)
1157                                 {
1158                                         qglEnable(GL_TEXTURE_1D);CHECKGLERROR
1159                                 }
1160                         }
1161                         else
1162                         {
1163                                 if (unit->t1d)
1164                                 {
1165                                         qglDisable(GL_TEXTURE_1D);CHECKGLERROR
1166                                 }
1167                         }
1168                 }
1169                 unit->t1d = tex1d;
1170                 qglBindTexture(GL_TEXTURE_1D, unit->t1d);CHECKGLERROR
1171         }
1172         // update 2d texture binding
1173         if (unit->t2d != tex2d)
1174         {
1175                 GL_ActiveTexture(unitnum);
1176                 if (unitnum < backendunits)
1177                 {
1178                         if (tex2d)
1179                         {
1180                                 if (unit->t2d == 0)
1181                                 {
1182                                         qglEnable(GL_TEXTURE_2D);CHECKGLERROR
1183                                 }
1184                         }
1185                         else
1186                         {
1187                                 if (unit->t2d)
1188                                 {
1189                                         qglDisable(GL_TEXTURE_2D);CHECKGLERROR
1190                                 }
1191                         }
1192                 }
1193                 unit->t2d = tex2d;
1194                 qglBindTexture(GL_TEXTURE_2D, unit->t2d);CHECKGLERROR
1195         }
1196         // update 3d texture binding
1197         if (unit->t3d != tex3d)
1198         {
1199                 GL_ActiveTexture(unitnum);
1200                 if (unitnum < backendunits)
1201                 {
1202                         if (tex3d)
1203                         {
1204                                 if (unit->t3d == 0)
1205                                 {
1206                                         qglEnable(GL_TEXTURE_3D);CHECKGLERROR
1207                                 }
1208                         }
1209                         else
1210                         {
1211                                 if (unit->t3d)
1212                                 {
1213                                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
1214                                 }
1215                         }
1216                 }
1217                 unit->t3d = tex3d;
1218                 qglBindTexture(GL_TEXTURE_3D, unit->t3d);CHECKGLERROR
1219         }
1220         // update cubemap texture binding
1221         if (unit->tcubemap != texcubemap)
1222         {
1223                 GL_ActiveTexture(unitnum);
1224                 if (unitnum < backendunits)
1225                 {
1226                         if (texcubemap)
1227                         {
1228                                 if (unit->tcubemap == 0)
1229                                 {
1230                                         qglEnable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
1231                                 }
1232                         }
1233                         else
1234                         {
1235                                 if (unit->tcubemap)
1236                                 {
1237                                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
1238                                 }
1239                         }
1240                 }
1241                 unit->tcubemap = texcubemap;
1242                 qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, unit->tcubemap);CHECKGLERROR
1243         }
1244 }
1245
1246 void R_Mesh_TexBind1D(unsigned int unitnum, int texnum)
1247 {
1248         gltextureunit_t *unit = gl_state.units + unitnum;
1249         if (unitnum >= backendimageunits)
1250                 return;
1251         // update 1d texture binding
1252         if (unit->t1d != texnum)
1253         {
1254                 GL_ActiveTexture(unitnum);
1255                 if (unitnum < backendunits)
1256                 {
1257                         if (texnum)
1258                         {
1259                                 if (unit->t1d == 0)
1260                                 {
1261                                         qglEnable(GL_TEXTURE_1D);CHECKGLERROR
1262                                 }
1263                         }
1264                         else
1265                         {
1266                                 if (unit->t1d)
1267                                 {
1268                                         qglDisable(GL_TEXTURE_1D);CHECKGLERROR
1269                                 }
1270                         }
1271                 }
1272                 unit->t1d = texnum;
1273                 qglBindTexture(GL_TEXTURE_1D, unit->t1d);CHECKGLERROR
1274         }
1275         // update 2d texture binding
1276         if (unit->t2d)
1277         {
1278                 GL_ActiveTexture(unitnum);
1279                 if (unitnum < backendunits)
1280                 {
1281                         if (unit->t2d)
1282                         {
1283                                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
1284                         }
1285                 }
1286                 unit->t2d = 0;
1287                 qglBindTexture(GL_TEXTURE_2D, unit->t2d);CHECKGLERROR
1288         }
1289         // update 3d texture binding
1290         if (unit->t3d)
1291         {
1292                 GL_ActiveTexture(unitnum);
1293                 if (unitnum < backendunits)
1294                 {
1295                         if (unit->t3d)
1296                         {
1297                                 qglDisable(GL_TEXTURE_3D);CHECKGLERROR
1298                         }
1299                 }
1300                 unit->t3d = 0;
1301                 qglBindTexture(GL_TEXTURE_3D, unit->t3d);CHECKGLERROR
1302         }
1303         // update cubemap texture binding
1304         if (unit->tcubemap)
1305         {
1306                 GL_ActiveTexture(unitnum);
1307                 if (unitnum < backendunits)
1308                 {
1309                         if (unit->tcubemap)
1310                         {
1311                                 qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
1312                         }
1313                 }
1314                 unit->tcubemap = 0;
1315                 qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, unit->tcubemap);CHECKGLERROR
1316         }
1317 }
1318
1319 void R_Mesh_TexBind(unsigned int unitnum, int texnum)
1320 {
1321         gltextureunit_t *unit = gl_state.units + unitnum;
1322         if (unitnum >= backendimageunits)
1323                 return;
1324         // update 1d texture binding
1325         if (unit->t1d)
1326         {
1327                 GL_ActiveTexture(unitnum);
1328                 if (unitnum < backendunits)
1329                 {
1330                         if (unit->t1d)
1331                         {
1332                                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
1333                         }
1334                 }
1335                 unit->t1d = 0;
1336                 qglBindTexture(GL_TEXTURE_1D, unit->t1d);CHECKGLERROR
1337         }
1338         // update 2d texture binding
1339         if (unit->t2d != texnum)
1340         {
1341                 GL_ActiveTexture(unitnum);
1342                 if (unitnum < backendunits)
1343                 {
1344                         if (texnum)
1345                         {
1346                                 if (unit->t2d == 0)
1347                                 {
1348                                         qglEnable(GL_TEXTURE_2D);CHECKGLERROR
1349                                 }
1350                         }
1351                         else
1352                         {
1353                                 if (unit->t2d)
1354                                 {
1355                                         qglDisable(GL_TEXTURE_2D);CHECKGLERROR
1356                                 }
1357                         }
1358                 }
1359                 unit->t2d = texnum;
1360                 qglBindTexture(GL_TEXTURE_2D, unit->t2d);CHECKGLERROR
1361         }
1362         // update 3d texture binding
1363         if (unit->t3d)
1364         {
1365                 GL_ActiveTexture(unitnum);
1366                 if (unitnum < backendunits)
1367                 {
1368                         if (unit->t3d)
1369                         {
1370                                 qglDisable(GL_TEXTURE_3D);CHECKGLERROR
1371                         }
1372                 }
1373                 unit->t3d = 0;
1374                 qglBindTexture(GL_TEXTURE_3D, unit->t3d);CHECKGLERROR
1375         }
1376         // update cubemap texture binding
1377         if (unit->tcubemap != 0)
1378         {
1379                 GL_ActiveTexture(unitnum);
1380                 if (unitnum < backendunits)
1381                 {
1382                         if (unit->tcubemap)
1383                         {
1384                                 qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
1385                         }
1386                 }
1387                 unit->tcubemap = 0;
1388                 qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, unit->tcubemap);CHECKGLERROR
1389         }
1390 }
1391
1392 void R_Mesh_TexBind3D(unsigned int unitnum, int texnum)
1393 {
1394         gltextureunit_t *unit = gl_state.units + unitnum;
1395         if (unitnum >= backendimageunits)
1396                 return;
1397         // update 1d texture binding
1398         if (unit->t1d)
1399         {
1400                 GL_ActiveTexture(unitnum);
1401                 if (unitnum < backendunits)
1402                 {
1403                         if (unit->t1d)
1404                         {
1405                                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
1406                         }
1407                 }
1408                 unit->t1d = 0;
1409                 qglBindTexture(GL_TEXTURE_1D, unit->t1d);CHECKGLERROR
1410         }
1411         // update 2d texture binding
1412         if (unit->t2d)
1413         {
1414                 GL_ActiveTexture(unitnum);
1415                 if (unitnum < backendunits)
1416                 {
1417                         if (unit->t2d)
1418                         {
1419                                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
1420                         }
1421                 }
1422                 unit->t2d = 0;
1423                 qglBindTexture(GL_TEXTURE_2D, unit->t2d);CHECKGLERROR
1424         }
1425         // update 3d texture binding
1426         if (unit->t3d != texnum)
1427         {
1428                 GL_ActiveTexture(unitnum);
1429                 if (unitnum < backendunits)
1430                 {
1431                         if (texnum)
1432                         {
1433                                 if (unit->t3d == 0)
1434                                 {
1435                                         qglEnable(GL_TEXTURE_3D);CHECKGLERROR
1436                                 }
1437                         }
1438                         else
1439                         {
1440                                 if (unit->t3d)
1441                                 {
1442                                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
1443                                 }
1444                         }
1445                 }
1446                 unit->t3d = texnum;
1447                 qglBindTexture(GL_TEXTURE_3D, unit->t3d);CHECKGLERROR
1448         }
1449         // update cubemap texture binding
1450         if (unit->tcubemap != 0)
1451         {
1452                 GL_ActiveTexture(unitnum);
1453                 if (unitnum < backendunits)
1454                 {
1455                         if (unit->tcubemap)
1456                         {
1457                                 qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
1458                         }
1459                 }
1460                 unit->tcubemap = 0;
1461                 qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, unit->tcubemap);CHECKGLERROR
1462         }
1463 }
1464
1465 void R_Mesh_TexBindCubeMap(unsigned int unitnum, int texnum)
1466 {
1467         gltextureunit_t *unit = gl_state.units + unitnum;
1468         if (unitnum >= backendimageunits)
1469                 return;
1470         // update 1d texture binding
1471         if (unit->t1d)
1472         {
1473                 GL_ActiveTexture(unitnum);
1474                 if (unitnum < backendunits)
1475                 {
1476                         if (unit->t1d)
1477                         {
1478                                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
1479                         }
1480                 }
1481                 unit->t1d = 0;
1482                 qglBindTexture(GL_TEXTURE_1D, unit->t1d);CHECKGLERROR
1483         }
1484         // update 2d texture binding
1485         if (unit->t2d)
1486         {
1487                 GL_ActiveTexture(unitnum);
1488                 if (unitnum < backendunits)
1489                 {
1490                         if (unit->t2d)
1491                         {
1492                                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
1493                         }
1494                 }
1495                 unit->t2d = 0;
1496                 qglBindTexture(GL_TEXTURE_2D, unit->t2d);CHECKGLERROR
1497         }
1498         // update 3d texture binding
1499         if (unit->t3d)
1500         {
1501                 GL_ActiveTexture(unitnum);
1502                 if (unitnum < backendunits)
1503                 {
1504                         if (unit->t3d)
1505                         {
1506                                 qglDisable(GL_TEXTURE_3D);CHECKGLERROR
1507                         }
1508                 }
1509                 unit->t3d = 0;
1510                 qglBindTexture(GL_TEXTURE_3D, unit->t3d);CHECKGLERROR
1511         }
1512         // update cubemap texture binding
1513         if (unit->tcubemap != texnum)
1514         {
1515                 GL_ActiveTexture(unitnum);
1516                 if (unitnum < backendunits)
1517                 {
1518                         if (texnum)
1519                         {
1520                                 if (unit->tcubemap == 0)
1521                                 {
1522                                         qglEnable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
1523                                 }
1524                         }
1525                         else
1526                         {
1527                                 if (unit->tcubemap)
1528                                 {
1529                                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
1530                                 }
1531                         }
1532                 }
1533                 unit->tcubemap = texnum;
1534                 qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, unit->tcubemap);CHECKGLERROR
1535         }
1536 }
1537
1538 void R_Mesh_TexMatrix(unsigned int unitnum, const matrix4x4_t *matrix)
1539 {
1540         gltextureunit_t *unit = gl_state.units + unitnum;
1541         if (matrix->m[3][3])
1542         {
1543                 // texmatrix specified, check if it is different
1544                 if (!unit->texmatrixenabled || memcmp(&unit->matrix, matrix, sizeof(matrix4x4_t)))
1545                 {
1546                         double glmatrix[16];
1547                         unit->texmatrixenabled = true;
1548                         unit->matrix = *matrix;
1549                         CHECKGLERROR
1550                         Matrix4x4_ToArrayDoubleGL(&unit->matrix, glmatrix);
1551                         qglMatrixMode(GL_TEXTURE);CHECKGLERROR
1552                         GL_ActiveTexture(unitnum);
1553                         qglLoadMatrixd(glmatrix);CHECKGLERROR
1554                         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
1555                 }
1556         }
1557         else
1558         {
1559                 // no texmatrix specified, revert to identity
1560                 if (unit->texmatrixenabled)
1561                 {
1562                         unit->texmatrixenabled = false;
1563                         CHECKGLERROR
1564                         qglMatrixMode(GL_TEXTURE);CHECKGLERROR
1565                         GL_ActiveTexture(unitnum);
1566                         qglLoadIdentity();CHECKGLERROR
1567                         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
1568                 }
1569         }
1570 }
1571
1572 void R_Mesh_TexCombine(unsigned int unitnum, int combinergb, int combinealpha, int rgbscale, int alphascale)
1573 {
1574         gltextureunit_t *unit = gl_state.units + unitnum;
1575         CHECKGLERROR
1576         if (gl_combine.integer)
1577         {
1578                 // GL_ARB_texture_env_combine
1579                 if (!combinergb)
1580                         combinergb = GL_MODULATE;
1581                 if (!combinealpha)
1582                         combinealpha = GL_MODULATE;
1583                 if (!rgbscale)
1584                         rgbscale = 1;
1585                 if (!alphascale)
1586                         alphascale = 1;
1587                 if (unit->combinergb != combinergb)
1588                 {
1589                         unit->combinergb = combinergb;
1590                         GL_ActiveTexture(unitnum);
1591                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, unit->combinergb);CHECKGLERROR
1592                 }
1593                 if (unit->combinealpha != combinealpha)
1594                 {
1595                         unit->combinealpha = combinealpha;
1596                         GL_ActiveTexture(unitnum);
1597                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, unit->combinealpha);CHECKGLERROR
1598                 }
1599                 if (unit->rgbscale != rgbscale)
1600                 {
1601                         GL_ActiveTexture(unitnum);
1602                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, (unit->rgbscale = rgbscale));CHECKGLERROR
1603                 }
1604                 if (unit->alphascale != alphascale)
1605                 {
1606                         GL_ActiveTexture(unitnum);
1607                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, (unit->alphascale = alphascale));CHECKGLERROR
1608                 }
1609         }
1610         else
1611         {
1612                 // normal GL texenv
1613                 if (!combinergb)
1614                         combinergb = GL_MODULATE;
1615                 if (unit->combinergb != combinergb)
1616                 {
1617                         unit->combinergb = combinergb;
1618                         GL_ActiveTexture(unitnum);
1619                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, unit->combinergb);CHECKGLERROR
1620                 }
1621         }
1622 }
1623
1624 void R_Mesh_TextureState(const rmeshstate_t *m)
1625 {
1626         unsigned int i;
1627
1628         BACKENDACTIVECHECK
1629
1630         CHECKGLERROR
1631         if (gl_backend_rebindtextures)
1632         {
1633                 gl_backend_rebindtextures = false;
1634                 GL_SetupTextureState();
1635                 CHECKGLERROR
1636         }
1637
1638         for (i = 0;i < backendimageunits;i++)
1639                 R_Mesh_TexBindAll(i, m->tex1d[i], m->tex[i], m->tex3d[i], m->texcubemap[i]);
1640         for (i = 0;i < backendarrayunits;i++)
1641         {
1642                 if (m->pointer_texcoord3f[i])
1643                         R_Mesh_TexCoordPointer(i, 3, m->pointer_texcoord3f[i]);
1644                 else
1645                         R_Mesh_TexCoordPointer(i, 2, m->pointer_texcoord[i]);
1646         }
1647         for (i = 0;i < backendunits;i++)
1648         {
1649                 R_Mesh_TexMatrix(i, &m->texmatrix[i]);
1650                 R_Mesh_TexCombine(i, m->texcombinergb[i], m->texcombinealpha[i], m->texrgbscale[i], m->texalphascale[i]);
1651         }
1652         CHECKGLERROR
1653 }
1654
1655 void R_Mesh_ResetTextureState(void)
1656 {
1657         unsigned int unitnum;
1658
1659         BACKENDACTIVECHECK
1660
1661         CHECKGLERROR
1662         if (gl_backend_rebindtextures)
1663         {
1664                 gl_backend_rebindtextures = false;
1665                 GL_SetupTextureState();
1666                 CHECKGLERROR
1667         }
1668
1669         for (unitnum = 0;unitnum < backendimageunits;unitnum++)
1670         {
1671                 gltextureunit_t *unit = gl_state.units + unitnum;
1672                 // update 1d texture binding
1673                 if (unit->t1d)
1674                 {
1675                         GL_ActiveTexture(unitnum);
1676                         if (unitnum < backendunits)
1677                         {
1678                                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
1679                         }
1680                         unit->t1d = 0;
1681                         qglBindTexture(GL_TEXTURE_1D, unit->t1d);CHECKGLERROR
1682                 }
1683                 // update 2d texture binding
1684                 if (unit->t2d)
1685                 {
1686                         GL_ActiveTexture(unitnum);
1687                         if (unitnum < backendunits)
1688                         {
1689                                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
1690                         }
1691                         unit->t2d = 0;
1692                         qglBindTexture(GL_TEXTURE_2D, unit->t2d);CHECKGLERROR
1693                 }
1694                 // update 3d texture binding
1695                 if (unit->t3d)
1696                 {
1697                         GL_ActiveTexture(unitnum);
1698                         if (unitnum < backendunits)
1699                         {
1700                                 qglDisable(GL_TEXTURE_3D);CHECKGLERROR
1701                         }
1702                         unit->t3d = 0;
1703                         qglBindTexture(GL_TEXTURE_3D, unit->t3d);CHECKGLERROR
1704                 }
1705                 // update cubemap texture binding
1706                 if (unit->tcubemap)
1707                 {
1708                         GL_ActiveTexture(unitnum);
1709                         if (unitnum < backendunits)
1710                         {
1711                                 qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
1712                         }
1713                         unit->tcubemap = 0;
1714                         qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, unit->tcubemap);CHECKGLERROR
1715                 }
1716         }
1717         for (unitnum = 0;unitnum < backendarrayunits;unitnum++)
1718         {
1719                 gltextureunit_t *unit = gl_state.units + unitnum;
1720                 // texture array unit is disabled, disable the array
1721                 if (unit->arrayenabled)
1722                 {
1723                         unit->arrayenabled = false;
1724                         GL_ClientActiveTexture(unitnum);
1725                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
1726                 }
1727         }
1728         for (unitnum = 0;unitnum < backendunits;unitnum++)
1729         {
1730                 gltextureunit_t *unit = gl_state.units + unitnum;
1731                 // no texmatrix specified, revert to identity
1732                 if (unit->texmatrixenabled)
1733                 {
1734                         unit->texmatrixenabled = false;
1735                         CHECKGLERROR
1736                         qglMatrixMode(GL_TEXTURE);CHECKGLERROR
1737                         GL_ActiveTexture(unitnum);
1738                         qglLoadIdentity();CHECKGLERROR
1739                         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
1740                 }
1741                 if (gl_combine.integer)
1742                 {
1743                         // GL_ARB_texture_env_combine
1744                         if (unit->combinergb != GL_MODULATE)
1745                         {
1746                                 unit->combinergb = GL_MODULATE;
1747                                 GL_ActiveTexture(unitnum);
1748                                 qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, unit->combinergb);CHECKGLERROR
1749                         }
1750                         if (unit->combinealpha != GL_MODULATE)
1751                         {
1752                                 unit->combinealpha = GL_MODULATE;
1753                                 GL_ActiveTexture(unitnum);
1754                                 qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, unit->combinealpha);CHECKGLERROR
1755                         }
1756                         if (unit->rgbscale != 1)
1757                         {
1758                                 GL_ActiveTexture(unitnum);
1759                                 qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, (unit->rgbscale = 1));CHECKGLERROR
1760                         }
1761                         if (unit->alphascale != 1)
1762                         {
1763                                 GL_ActiveTexture(unitnum);
1764                                 qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, (unit->alphascale = 1));CHECKGLERROR
1765                         }
1766                 }
1767                 else
1768                 {
1769                         // normal GL texenv
1770                         if (unit->combinergb != GL_MODULATE)
1771                         {
1772                                 unit->combinergb = GL_MODULATE;
1773                                 GL_ActiveTexture(unitnum);
1774                                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, unit->combinergb);CHECKGLERROR
1775                         }
1776                 }
1777         }
1778 }
1779
1780 void R_Mesh_Draw_ShowTris(int firstvertex, int numvertices, int numtriangles, const int *elements)
1781 {
1782         CHECKGLERROR
1783         qglBegin(GL_LINES);
1784         for (;numtriangles;numtriangles--, elements += 3)
1785         {
1786                 qglArrayElement(elements[0]);qglArrayElement(elements[1]);
1787                 qglArrayElement(elements[1]);qglArrayElement(elements[2]);
1788                 qglArrayElement(elements[2]);qglArrayElement(elements[0]);
1789         }
1790         qglEnd();
1791         CHECKGLERROR
1792 }