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", "0", "enables use of glLockArraysEXT, may cause glitches with some broken drivers, and may be slower than normal"};
  16 cvar_t gl_lockarrays_minimumvertices = {0, "gl_lockarrays_minimumvertices", "1", "minimum number of vertices required for use of glLockArraysEXT, setting this too low may reduce performance"};
  17 cvar_t gl_vbo = {CVAR_SAVE, "gl_vbo", "1", "make use of GL_ARB_vertex_buffer_object extension to store static geometry in video memory for faster rendering"};
  18
  19 cvar_t v_flipped = {0, "v_flipped", "0", "mirror the screen (poor man's left handed mode)"};
  20 qboolean v_flipped_state = false;
  21
  22 int gl_maxdrawrangeelementsvertices;
  23 int gl_maxdrawrangeelementsindices;
  24
  25 #ifdef DEBUGGL
  26 int errornumber = 0;
  27
  28 void GL_PrintError(int errornumber, char *filename, int linenumber)
  29 {
  30         switch(errornumber)
  31         {
  32 #ifdef GL_INVALID_ENUM
  33         case GL_INVALID_ENUM:
  34                 Con_Printf("GL_INVALID_ENUM at %s:%i\n", filename, linenumber);
  35                 break;
  36 #endif
  37 #ifdef GL_INVALID_VALUE
  38         case GL_INVALID_VALUE:
  39                 Con_Printf("GL_INVALID_VALUE at %s:%i\n", filename, linenumber);
  40                 break;
  41 #endif
  42 #ifdef GL_INVALID_OPERATION
  43         case GL_INVALID_OPERATION:
  44                 Con_Printf("GL_INVALID_OPERATION at %s:%i\n", filename, linenumber);
  45                 break;
  46 #endif
  47 #ifdef GL_STACK_OVERFLOW
  48         case GL_STACK_OVERFLOW:
  49                 Con_Printf("GL_STACK_OVERFLOW at %s:%i\n", filename, linenumber);
  50                 break;
  51 #endif
  52 #ifdef GL_STACK_UNDERFLOW
  53         case GL_STACK_UNDERFLOW:
  54                 Con_Printf("GL_STACK_UNDERFLOW at %s:%i\n", filename, linenumber);
  55                 break;
  56 #endif
  57 #ifdef GL_OUT_OF_MEMORY
  58         case GL_OUT_OF_MEMORY:
  59                 Con_Printf("GL_OUT_OF_MEMORY at %s:%i\n", filename, linenumber);
  60                 break;
  61 #endif
  62 #ifdef GL_TABLE_TOO_LARGE
  63         case GL_TABLE_TOO_LARGE:
  64                 Con_Printf("GL_TABLE_TOO_LARGE at %s:%i\n", filename, linenumber);
  65                 break;
  66 #endif
  67         default:
  68                 Con_Printf("GL UNKNOWN (%i) at %s:%i\n", errornumber, filename, linenumber);
  69                 break;
  70         }
  71 }
  72 #endif
  73
  74 #define BACKENDACTIVECHECK if (!backendactive) Sys_Error("GL backend function called when backend is not active");
  75
  76 void SCR_ScreenShot_f (void);
  77
  78 static matrix4x4_t backend_viewmatrix;
  79 static matrix4x4_t backend_modelmatrix;
  80 static matrix4x4_t backend_modelviewmatrix;
  81 static matrix4x4_t backend_projectmatrix;
  82
  83 static unsigned int backendunits, backendimageunits, backendarrayunits, backendactive;
  84
  85 /*
  86 note: here's strip order for a terrain row:
  87 0--1--2--3--4
  88 |\ |\ |\ |\ |
  89 | \| \| \| \|
  90 A--B--C--D--E
  91 clockwise
  92
  93 A0B, 01B, B1C, 12C, C2D, 23D, D3E, 34E
  94
  95 *elements++ = i + row;
  96 *elements++ = i;
  97 *elements++ = i + row + 1;
  98 *elements++ = i;
  99 *elements++ = i + 1;
 100 *elements++ = i + row + 1;
 101
 102
 103 for (y = 0;y < rows - 1;y++)
 104 {
 105         for (x = 0;x < columns - 1;x++)
 106         {
 107                 i = y * rows + x;
 108                 *elements++ = i + columns;
 109                 *elements++ = i;
 110                 *elements++ = i + columns + 1;
 111                 *elements++ = i;
 112                 *elements++ = i + 1;
 113                 *elements++ = i + columns + 1;
 114         }
 115 }
 116
 117 alternative:
 118 0--1--2--3--4
 119 | /| /|\ | /|
 120 |/ |/ | \|/ |
 121 A--B--C--D--E
 122 counterclockwise
 123
 124 for (y = 0;y < rows - 1;y++)
 125 {
 126         for (x = 0;x < columns - 1;x++)
 127         {
 128                 i = y * rows + x;
 129                 *elements++ = i;
 130                 *elements++ = i + columns;
 131                 *elements++ = i + columns + 1;
 132                 *elements++ = i + columns;
 133                 *elements++ = i + columns + 1;
 134                 *elements++ = i + 1;
 135         }
 136 }
 137 */
 138
 139 int polygonelements[(POLYGONELEMENTS_MAXPOINTS-2)*3];
 140 int quadelements[QUADELEMENTS_MAXQUADS*6];
 141
 142 void GL_Backend_AllocArrays(void)
 143 {
 144 }
 145
 146 void GL_Backend_FreeArrays(void)
 147 {
 148 }
 149
 150 void GL_VBOStats_f(void)
 151 {
 152         GL_Mesh_ListVBOs(true);
 153 }
 154
 155 typedef struct gl_bufferobjectinfo_s
 156 {
 157         int target;
 158         int object;
 159         size_t size;
 160         char name[MAX_QPATH];
 161 }
 162 gl_bufferobjectinfo_t;
 163
 164 memexpandablearray_t gl_bufferobjectinfoarray;
 165
 166 static void gl_backend_start(void)
 167 {
 168         CHECKGLERROR
 169
 170         if (qglDrawRangeElements != NULL)
 171         {
 172                 CHECKGLERROR
 173                 qglGetIntegerv(GL_MAX_ELEMENTS_VERTICES, &gl_maxdrawrangeelementsvertices);
 174                 CHECKGLERROR
 175                 qglGetIntegerv(GL_MAX_ELEMENTS_INDICES, &gl_maxdrawrangeelementsindices);
 176                 CHECKGLERROR
 177                 Con_DPrintf("GL_MAX_ELEMENTS_VERTICES = %i\nGL_MAX_ELEMENTS_INDICES = %i\n", gl_maxdrawrangeelementsvertices, gl_maxdrawrangeelementsindices);
 178         }
 179
 180         backendunits = bound(1, gl_textureunits, MAX_TEXTUREUNITS);
 181         backendimageunits = backendunits;
 182         backendarrayunits = backendunits;
 183         if (gl_support_fragment_shader)
 184         {
 185                 CHECKGLERROR
 186                 qglGetIntegerv(GL_MAX_TEXTURE_IMAGE_UNITS_ARB, (int *)&backendimageunits);
 187                 CHECKGLERROR
 188                 qglGetIntegerv(GL_MAX_TEXTURE_COORDS_ARB, (int *)&backendarrayunits);
 189                 CHECKGLERROR
 190                 Con_DPrintf("GLSL shader support detected: texture units = %i texenv, %i image, %i array\n", backendunits, backendimageunits, backendarrayunits);
 191                 backendimageunits = bound(1, backendimageunits, MAX_TEXTUREUNITS);
 192                 backendarrayunits = bound(1, backendarrayunits, MAX_TEXTUREUNITS);
 193         }
 194         else
 195                 Con_DPrintf("GL_MAX_TEXTUREUNITS = %i\n", backendunits);
 196
 197         GL_Backend_AllocArrays();
 198
 199         Mem_ExpandableArray_NewArray(&gl_bufferobjectinfoarray, r_main_mempool, sizeof(gl_bufferobjectinfo_t), 128);
 200
 201         Con_DPrintf("OpenGL backend started.\n");
 202
 203         CHECKGLERROR
 204
 205         backendactive = true;
 206 }
 207
 208 static void gl_backend_shutdown(void)
 209 {
 210         backendunits = 0;
 211         backendimageunits = 0;
 212         backendarrayunits = 0;
 213         backendactive = false;
 214
 215         Con_DPrint("OpenGL Backend shutting down\n");
 216
 217         Mem_ExpandableArray_FreeArray(&gl_bufferobjectinfoarray);
 218
 219         GL_Backend_FreeArrays();
 220 }
 221
 222 static void gl_backend_newmap(void)
 223 {
 224 }
 225
 226 void gl_backend_init(void)
 227 {
 228         int i;
 229
 230         for (i = 0;i < POLYGONELEMENTS_MAXPOINTS - 2;i++)
 231         {
 232                 polygonelements[i * 3 + 0] = 0;
 233                 polygonelements[i * 3 + 1] = i + 1;
 234                 polygonelements[i * 3 + 2] = i + 2;
 235         }
 236         // elements for rendering a series of quads as triangles
 237         for (i = 0;i < QUADELEMENTS_MAXQUADS;i++)
 238         {
 239                 quadelements[i * 6 + 0] = i * 4;
 240                 quadelements[i * 6 + 1] = i * 4 + 1;
 241                 quadelements[i * 6 + 2] = i * 4 + 2;
 242                 quadelements[i * 6 + 3] = i * 4;
 243                 quadelements[i * 6 + 4] = i * 4 + 2;
 244                 quadelements[i * 6 + 5] = i * 4 + 3;
 245         }
 246
 247         Cvar_RegisterVariable(&r_render);
 248         Cvar_RegisterVariable(&r_waterwarp);
 249         Cvar_RegisterVariable(&gl_polyblend);
 250         Cvar_RegisterVariable(&v_flipped);
 251         Cvar_RegisterVariable(&gl_dither);
 252         Cvar_RegisterVariable(&gl_lockarrays);
 253         Cvar_RegisterVariable(&gl_lockarrays_minimumvertices);
 254         Cvar_RegisterVariable(&gl_vbo);
 255         Cvar_RegisterVariable(&gl_paranoid);
 256         Cvar_RegisterVariable(&gl_printcheckerror);
 257 #ifdef NORENDER
 258         Cvar_SetValue("r_render", 0);
 259 #endif
 260
 261         Cvar_RegisterVariable(&gl_mesh_drawrangeelements);
 262         Cvar_RegisterVariable(&gl_mesh_testarrayelement);
 263         Cvar_RegisterVariable(&gl_mesh_testmanualfeeding);
 264
 265         Cmd_AddCommand("gl_vbostats", GL_VBOStats_f, "prints a list of all buffer objects (vertex data and triangle elements) and total video memory used by them");
 266
 267         R_RegisterModule("GL_Backend", gl_backend_start, gl_backend_shutdown, gl_backend_newmap);
 268 }
 269
 270 void GL_SetMirrorState(qboolean state);
 271
 272 void GL_SetupView_Orientation_Identity (void)
 273 {
 274         backend_viewmatrix = identitymatrix;
 275         GL_SetMirrorState(false);
 276         memset(&backend_modelmatrix, 0, sizeof(backend_modelmatrix));
 277 }
 278
 279 void GL_SetupView_Orientation_FromEntity(const matrix4x4_t *matrix)
 280 {
 281         matrix4x4_t tempmatrix, basematrix;
 282         Matrix4x4_Invert_Full(&tempmatrix, matrix);
 283         Matrix4x4_CreateRotate(&basematrix, -90, 1, 0, 0);
 284         Matrix4x4_ConcatRotate(&basematrix, 90, 0, 0, 1);
 285         Matrix4x4_Concat(&backend_viewmatrix, &basematrix, &tempmatrix);
 286
 287         GL_SetMirrorState(v_flipped.integer);
 288         if(v_flipped_state)
 289         {
 290                 Matrix4x4_Transpose(&basematrix, &backend_viewmatrix);
 291                 Matrix4x4_ConcatScale3(&basematrix, -1, 1, 1);
 292                 Matrix4x4_Transpose(&backend_viewmatrix, &basematrix);
 293         }
 294
 295         //Matrix4x4_ConcatRotate(&backend_viewmatrix, -angles[2], 1, 0, 0);
 296         //Matrix4x4_ConcatRotate(&backend_viewmatrix, -angles[0], 0, 1, 0);
 297         //Matrix4x4_ConcatRotate(&backend_viewmatrix, -angles[1], 0, 0, 1);
 298         //Matrix4x4_ConcatTranslate(&backend_viewmatrix, -origin[0], -origin[1], -origin[2]);
 299
 300         // force an update of the model matrix by copying it off, resetting it, and then calling the R_Mesh_Matrix function with it
 301         tempmatrix = backend_modelmatrix;
 302         memset(&backend_modelmatrix, 0, sizeof(backend_modelmatrix));
 303         R_Mesh_Matrix(&tempmatrix);
 304 }
 305
 306 void GL_SetupView_Mode_Perspective (double frustumx, double frustumy, double zNear, double zFar)
 307 {
 308         double m[16];
 309
 310         // set up viewpoint
 311         CHECKGLERROR
 312         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 313         qglLoadIdentity();CHECKGLERROR
 314         // set view pyramid
 315         qglFrustum(-frustumx * zNear, frustumx * zNear, -frustumy * zNear, frustumy * zNear, zNear, zFar);CHECKGLERROR
 316         qglGetDoublev(GL_PROJECTION_MATRIX, m);CHECKGLERROR
 317         Matrix4x4_FromArrayDoubleGL(&backend_projectmatrix, m);
 318         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 319         GL_SetupView_Orientation_Identity();
 320         CHECKGLERROR
 321 }
 322
 323 void GL_SetupView_Mode_PerspectiveInfiniteFarClip (double frustumx, double frustumy, double zNear)
 324 {
 325         double nudge, m[16];
 326
 327         // set up viewpoint
 328         CHECKGLERROR
 329         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 330         qglLoadIdentity();CHECKGLERROR
 331         // set view pyramid
 332         nudge = 1.0 - 1.0 / (1<<23);
 333         m[ 0] = 1.0 / frustumx;
 334         m[ 1] = 0;
 335         m[ 2] = 0;
 336         m[ 3] = 0;
 337         m[ 4] = 0;
 338         m[ 5] = 1.0 / frustumy;
 339         m[ 6] = 0;
 340         m[ 7] = 0;
 341         m[ 8] = 0;
 342         m[ 9] = 0;
 343         m[10] = -nudge;
 344         m[11] = -1;
 345         m[12] = 0;
 346         m[13] = 0;
 347         m[14] = -2 * zNear * nudge;
 348         m[15] = 0;
 349         qglLoadMatrixd(m);CHECKGLERROR
 350         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 351         GL_SetupView_Orientation_Identity();
 352         CHECKGLERROR
 353         Matrix4x4_FromArrayDoubleGL(&backend_projectmatrix, m);
 354 }
 355
 356 void GL_SetupView_Mode_Ortho (double x1, double y1, double x2, double y2, double zNear, double zFar)
 357 {
 358         double m[16];
 359
 360         // set up viewpoint
 361         CHECKGLERROR
 362         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 363         qglLoadIdentity();CHECKGLERROR
 364         qglOrtho(x1, x2, y2, y1, zNear, zFar);CHECKGLERROR
 365         qglGetDoublev(GL_PROJECTION_MATRIX, m);CHECKGLERROR
 366         Matrix4x4_FromArrayDoubleGL(&backend_projectmatrix, m);
 367         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 368         GL_SetupView_Orientation_Identity();
 369         CHECKGLERROR
 370 }
 371
 372 void GL_SetupView_ApplyCustomNearClipPlane(double normalx, double normaly, double normalz, double dist)
 373 {
 374         double matrix[16];
 375         double q[4];
 376         double d;
 377         float clipPlane[4], v3[3], v4[3];
 378         float normal[3];
 379
 380         // This is Olique Depth Projection from http://www.terathon.com/code/oblique.php
 381         // modified to fit in this codebase.
 382
 383         VectorSet(normal, normalx, normaly, normalz);
 384         Matrix4x4_Transform3x3(&backend_viewmatrix, normal, clipPlane);
 385         VectorScale(normal, dist, v3);
 386         Matrix4x4_Transform(&backend_viewmatrix, v3, v4);
 387         // FIXME: LordHavoc: I think this can be done more efficiently somehow but I can't remember the technique
 388         clipPlane[3] = -DotProduct(v4, clipPlane);
 389
 390 #if 0
 391 {
 392         // testing code for comparing results
 393         float clipPlane2[4];
 394         VectorCopy4(clipPlane, clipPlane2);
 395         R_Mesh_Matrix(&identitymatrix);
 396         VectorSet(q, normal[0], normal[1], normal[2], -dist);
 397         qglClipPlane(GL_CLIP_PLANE0, q);
 398         qglGetClipPlane(GL_CLIP_PLANE0, q);
 399         VectorCopy4(q, clipPlane);
 400 }
 401 #endif
 402
 403         // Calculate the clip-space corner point opposite the clipping plane
 404         // as (sgn(clipPlane.x), sgn(clipPlane.y), 1, 1) and
 405         // transform it into camera space by multiplying it
 406         // by the inverse of the projection matrix
 407         Matrix4x4_ToArrayDoubleGL(&backend_projectmatrix, matrix);
 408
 409         q[0] = ((clipPlane[0] < 0.0f ? -1.0f : clipPlane[0] > 0.0f ? 1.0f : 0.0f) + matrix[8]) / matrix[0];
 410         q[1] = ((clipPlane[1] < 0.0f ? -1.0f : clipPlane[1] > 0.0f ? 1.0f : 0.0f) + matrix[9]) / matrix[5];
 411         q[2] = -1.0f;
 412         q[3] = (1.0f + matrix[10]) / matrix[14];
 413
 414         // Calculate the scaled plane vector
 415         d = 2.0f / DotProduct4(clipPlane, q);
 416
 417         // Replace the third row of the projection matrix
 418         matrix[2] = clipPlane[0] * d;
 419         matrix[6] = clipPlane[1] * d;
 420         matrix[10] = clipPlane[2] * d + 1.0f;
 421         matrix[14] = clipPlane[3] * d;
 422
 423         // Load it back into OpenGL
 424         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 425         qglLoadMatrixd(matrix);CHECKGLERROR
 426         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 427         CHECKGLERROR
 428         Matrix4x4_FromArrayDoubleGL(&backend_projectmatrix, matrix);
 429 }
 430
 431 typedef struct gltextureunit_s
 432 {
 433         const void *pointer_texcoord;
 434         size_t pointer_texcoord_offset;
 435         int pointer_texcoord_buffer;
 436         int t1d, t2d, t3d, tcubemap;
 437         int arrayenabled;
 438         unsigned int arraycomponents;
 439         int rgbscale, alphascale;
 440         int combinergb, combinealpha;
 441         // FIXME: add more combine stuff
 442         // texmatrixenabled exists only to avoid unnecessary texmatrix compares
 443         int texmatrixenabled;
 444         matrix4x4_t matrix;
 445 }
 446 gltextureunit_t;
 447
 448 static struct gl_state_s
 449 {
 450         int cullface;
 451         int cullfaceenable;
 452         int blendfunc1;
 453         int blendfunc2;
 454         int blend;
 455         GLboolean depthmask;
 456         int colormask; // stored as bottom 4 bits: r g b a (3 2 1 0 order)
 457         int depthtest;
 458         float depthrange[2];
 459         float polygonoffset[2];
 460         int alphatest;
 461         int scissortest;
 462         unsigned int unit;
 463         unsigned int clientunit;
 464         gltextureunit_t units[MAX_TEXTUREUNITS];
 465         float color4f[4];
 466         int lockrange_first;
 467         int lockrange_count;
 468         int vertexbufferobject;
 469         int elementbufferobject;
 470         qboolean pointer_color_enabled;
 471         const void *pointer_vertex;
 472         const void *pointer_color;
 473         size_t pointer_vertex_offset;
 474         size_t pointer_color_offset;
 475         int pointer_vertex_buffer;
 476         int pointer_color_buffer;
 477 }
 478 gl_state;
 479
 480 static void GL_BindVBO(int bufferobject)
 481 {
 482         if (gl_state.vertexbufferobject != bufferobject)
 483         {
 484                 gl_state.vertexbufferobject = bufferobject;
 485                 CHECKGLERROR
 486                 qglBindBufferARB(GL_ARRAY_BUFFER_ARB, bufferobject);
 487                 CHECKGLERROR
 488         }
 489 }
 490
 491 static void GL_BindEBO(int bufferobject)
 492 {
 493         if (gl_state.elementbufferobject != bufferobject)
 494         {
 495                 gl_state.elementbufferobject = bufferobject;
 496                 CHECKGLERROR
 497                 qglBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, bufferobject);
 498                 CHECKGLERROR
 499         }
 500 }
 501
 502 void GL_SetupTextureState(void)
 503 {
 504         unsigned int i;
 505         gltextureunit_t *unit;
 506         CHECKGLERROR
 507         gl_state.unit = MAX_TEXTUREUNITS;
 508         gl_state.clientunit = MAX_TEXTUREUNITS;
 509         for (i = 0;i < MAX_TEXTUREUNITS;i++)
 510         {
 511                 unit = gl_state.units + i;
 512                 unit->t1d = 0;
 513                 unit->t2d = 0;
 514                 unit->t3d = 0;
 515                 unit->tcubemap = 0;
 516                 unit->arrayenabled = false;
 517                 unit->arraycomponents = 0;
 518                 unit->pointer_texcoord = NULL;
 519                 unit->pointer_texcoord_buffer = 0;
 520                 unit->pointer_texcoord_offset = 0;
 521                 unit->rgbscale = 1;
 522                 unit->alphascale = 1;
 523                 unit->combinergb = GL_MODULATE;
 524                 unit->combinealpha = GL_MODULATE;
 525                 unit->texmatrixenabled = false;
 526                 unit->matrix = identitymatrix;
 527         }
 528
 529         for (i = 0;i < backendimageunits;i++)
 530         {
 531                 GL_ActiveTexture(i);
 532                 qglBindTexture(GL_TEXTURE_1D, 0);CHECKGLERROR
 533                 qglBindTexture(GL_TEXTURE_2D, 0);CHECKGLERROR
 534                 if (gl_texture3d)
 535                 {
 536                         qglBindTexture(GL_TEXTURE_3D, 0);CHECKGLERROR
 537                 }
 538                 if (gl_texturecubemap)
 539                 {
 540                         qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, 0);CHECKGLERROR
 541                 }
 542         }
 543
 544         for (i = 0;i < backendarrayunits;i++)
 545         {
 546                 GL_ClientActiveTexture(i);
 547                 GL_BindVBO(0);
 548                 qglTexCoordPointer(2, GL_FLOAT, sizeof(float[2]), NULL);CHECKGLERROR
 549                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 550         }
 551
 552         for (i = 0;i < backendunits;i++)
 553         {
 554                 GL_ActiveTexture(i);
 555                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 556                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 557                 if (gl_texture3d)
 558                 {
 559                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 560                 }
 561                 if (gl_texturecubemap)
 562                 {
 563                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 564                 }
 565                 qglMatrixMode(GL_TEXTURE);CHECKGLERROR
 566                 qglLoadIdentity();CHECKGLERROR
 567                 qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 568                 if (gl_combine.integer)
 569                 {
 570                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);CHECKGLERROR
 571                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_MODULATE);CHECKGLERROR
 572                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE);CHECKGLERROR
 573                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 574                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_RGB_ARB, GL_TEXTURE);CHECKGLERROR // for GL_INTERPOLATE_ARB mode
 575                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 576                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 577                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_RGB_ARB, GL_SRC_ALPHA);CHECKGLERROR
 578                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, GL_MODULATE);CHECKGLERROR
 579                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA_ARB, GL_TEXTURE);CHECKGLERROR
 580                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_ALPHA_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 581                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_ALPHA_ARB, GL_CONSTANT_ARB);CHECKGLERROR
 582                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 583                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 584                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 585                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
 586                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
 587                 }
 588                 else
 589                 {
 590                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 591                 }
 592                 CHECKGLERROR
 593         }
 594         CHECKGLERROR
 595 }
 596
 597 void GL_Backend_ResetState(void)
 598 {
 599         memset(&gl_state, 0, sizeof(gl_state));
 600         gl_state.depthtest = true;
 601         gl_state.alphatest = false;
 602         gl_state.blendfunc1 = GL_ONE;
 603         gl_state.blendfunc2 = GL_ZERO;
 604         gl_state.blend = false;
 605         gl_state.depthmask = GL_TRUE;
 606         gl_state.colormask = 15;
 607         gl_state.color4f[0] = gl_state.color4f[1] = gl_state.color4f[2] = gl_state.color4f[3] = 1;
 608         gl_state.lockrange_first = 0;
 609         gl_state.lockrange_count = 0;
 610         gl_state.cullface = v_flipped_state ? GL_BACK : GL_FRONT; // quake is backwards, this culls back faces
 611         gl_state.cullfaceenable = true;
 612         gl_state.polygonoffset[0] = 0;
 613         gl_state.polygonoffset[1] = 0;
 614
 615         CHECKGLERROR
 616
 617         qglColorMask(1, 1, 1, 1);
 618         qglAlphaFunc(GL_GEQUAL, 0.5);CHECKGLERROR
 619         qglDisable(GL_ALPHA_TEST);CHECKGLERROR
 620         qglBlendFunc(gl_state.blendfunc1, gl_state.blendfunc2);CHECKGLERROR
 621         qglDisable(GL_BLEND);CHECKGLERROR
 622         qglCullFace(gl_state.cullface);CHECKGLERROR
 623         qglEnable(GL_CULL_FACE);CHECKGLERROR
 624         qglDepthFunc(GL_LEQUAL);CHECKGLERROR
 625         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 626         qglDepthMask(gl_state.depthmask);CHECKGLERROR
 627         qglPolygonOffset(gl_state.polygonoffset[0], gl_state.polygonoffset[1]);
 628
 629         if (gl_support_arb_vertex_buffer_object)
 630         {
 631                 qglBindBufferARB(GL_ARRAY_BUFFER_ARB, 0);
 632                 qglBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, 0);
 633         }
 634
 635         qglVertexPointer(3, GL_FLOAT, sizeof(float[3]), NULL);CHECKGLERROR
 636         qglEnableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 637
 638         qglColorPointer(4, GL_FLOAT, sizeof(float[4]), NULL);CHECKGLERROR
 639         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 640
 641         GL_Color(0, 0, 0, 0);
 642         GL_Color(1, 1, 1, 1);
 643
 644         GL_SetupTextureState();
 645 }
 646
 647 void GL_ActiveTexture(unsigned int num)
 648 {
 649         if (gl_state.unit != num)
 650         {
 651                 gl_state.unit = num;
 652                 if (qglActiveTexture)
 653                 {
 654                         CHECKGLERROR
 655                         qglActiveTexture(GL_TEXTURE0_ARB + gl_state.unit);
 656                         CHECKGLERROR
 657                 }
 658         }
 659 }
 660
 661 void GL_ClientActiveTexture(unsigned int num)
 662 {
 663         if (gl_state.clientunit != num)
 664         {
 665                 gl_state.clientunit = num;
 666                 if (qglActiveTexture)
 667                 {
 668                         CHECKGLERROR
 669                         qglClientActiveTexture(GL_TEXTURE0_ARB + gl_state.clientunit);
 670                         CHECKGLERROR
 671                 }
 672         }
 673 }
 674
 675 void GL_BlendFunc(int blendfunc1, int blendfunc2)
 676 {
 677         if (gl_state.blendfunc1 != blendfunc1 || gl_state.blendfunc2 != blendfunc2)
 678         {
 679                 CHECKGLERROR
 680                 qglBlendFunc(gl_state.blendfunc1 = blendfunc1, gl_state.blendfunc2 = blendfunc2);CHECKGLERROR
 681                 if (gl_state.blendfunc2 == GL_ZERO)
 682                 {
 683                         if (gl_state.blendfunc1 == GL_ONE)
 684                         {
 685                                 if (gl_state.blend)
 686                                 {
 687                                         gl_state.blend = 0;
 688                                         qglDisable(GL_BLEND);CHECKGLERROR
 689                                 }
 690                         }
 691                         else
 692                         {
 693                                 if (!gl_state.blend)
 694                                 {
 695                                         gl_state.blend = 1;
 696                                         qglEnable(GL_BLEND);CHECKGLERROR
 697                                 }
 698                         }
 699                 }
 700                 else
 701                 {
 702                         if (!gl_state.blend)
 703                         {
 704                                 gl_state.blend = 1;
 705                                 qglEnable(GL_BLEND);CHECKGLERROR
 706                         }
 707                 }
 708         }
 709 }
 710
 711 void GL_DepthMask(int state)
 712 {
 713         if (gl_state.depthmask != state)
 714         {
 715                 CHECKGLERROR
 716                 qglDepthMask(gl_state.depthmask = state);CHECKGLERROR
 717         }
 718 }
 719
 720 void GL_DepthTest(int state)
 721 {
 722         if (gl_state.depthtest != state)
 723         {
 724                 gl_state.depthtest = state;
 725                 CHECKGLERROR
 726                 if (gl_state.depthtest)
 727                 {
 728                         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 729                 }
 730                 else
 731                 {
 732                         qglDisable(GL_DEPTH_TEST);CHECKGLERROR
 733                 }
 734         }
 735 }
 736
 737 void GL_DepthRange(float nearfrac, float farfrac)
 738 {
 739         if (gl_state.depthrange[0] != nearfrac || gl_state.depthrange[1] != farfrac)
 740         {
 741                 gl_state.depthrange[0] = nearfrac;
 742                 gl_state.depthrange[1] = farfrac;
 743                 qglDepthRange(nearfrac, farfrac);
 744         }
 745 }
 746
 747 void GL_PolygonOffset(float planeoffset, float depthoffset)
 748 {
 749         if (gl_state.polygonoffset[0] != planeoffset || gl_state.polygonoffset[1] != depthoffset)
 750         {
 751                 gl_state.polygonoffset[0] = planeoffset;
 752                 gl_state.polygonoffset[1] = depthoffset;
 753                 qglPolygonOffset(planeoffset, depthoffset);
 754         }
 755 }
 756
 757 void GL_SetMirrorState(qboolean state)
 758 {
 759         if(!state != !v_flipped_state)
 760         {
 761                 // change cull face mode!
 762                 if(gl_state.cullface == GL_BACK)
 763                         qglCullFace((gl_state.cullface = GL_FRONT));
 764                 else if(gl_state.cullface == GL_FRONT)
 765                         qglCullFace((gl_state.cullface = GL_BACK));
 766         }
 767         v_flipped_state = state;
 768 }
 769
 770 void GL_CullFace(int state)
 771 {
 772         CHECKGLERROR
 773
 774         if(v_flipped_state)
 775         {
 776                 if(state == GL_FRONT)
 777                         state = GL_BACK;
 778                 else if(state == GL_BACK)
 779                         state = GL_FRONT;
 780         }
 781
 782         if (state != GL_NONE)
 783         {
 784                 if (!gl_state.cullfaceenable)
 785                 {
 786                         gl_state.cullfaceenable = true;
 787                         qglEnable(GL_CULL_FACE);CHECKGLERROR
 788                 }
 789                 if (gl_state.cullface != state)
 790                 {
 791                         gl_state.cullface = state;
 792                         qglCullFace(gl_state.cullface);CHECKGLERROR
 793                 }
 794         }
 795         else
 796         {
 797                 if (gl_state.cullfaceenable)
 798                 {
 799                         gl_state.cullfaceenable = false;
 800                         qglDisable(GL_CULL_FACE);CHECKGLERROR
 801                 }
 802         }
 803 }
 804
 805 void GL_AlphaTest(int state)
 806 {
 807         if (gl_state.alphatest != state)
 808         {
 809                 gl_state.alphatest = state;
 810                 CHECKGLERROR
 811                 if (gl_state.alphatest)
 812                 {
 813                         qglEnable(GL_ALPHA_TEST);CHECKGLERROR
 814                 }
 815                 else
 816                 {
 817                         qglDisable(GL_ALPHA_TEST);CHECKGLERROR
 818                 }
 819         }
 820 }
 821
 822 void GL_ColorMask(int r, int g, int b, int a)
 823 {
 824         int state = r*8 + g*4 + b*2 + a*1;
 825         if (gl_state.colormask != state)
 826         {
 827                 gl_state.colormask = state;
 828                 CHECKGLERROR
 829                 qglColorMask((GLboolean)r, (GLboolean)g, (GLboolean)b, (GLboolean)a);CHECKGLERROR
 830         }
 831 }
 832
 833 void GL_Color(float cr, float cg, float cb, float ca)
 834 {
 835         if (gl_state.pointer_color_enabled || gl_state.color4f[0] != cr || gl_state.color4f[1] != cg || gl_state.color4f[2] != cb || gl_state.color4f[3] != ca)
 836         {
 837                 gl_state.color4f[0] = cr;
 838                 gl_state.color4f[1] = cg;
 839                 gl_state.color4f[2] = cb;
 840                 gl_state.color4f[3] = ca;
 841                 CHECKGLERROR
 842                 qglColor4f(gl_state.color4f[0], gl_state.color4f[1], gl_state.color4f[2], gl_state.color4f[3]);
 843                 CHECKGLERROR
 844         }
 845 }
 846
 847 void GL_LockArrays(int first, int count)
 848 {
 849         if (count < gl_lockarrays_minimumvertices.integer)
 850         {
 851                 first = 0;
 852                 count = 0;
 853         }
 854         if (gl_state.lockrange_count != count || gl_state.lockrange_first != first)
 855         {
 856                 if (gl_state.lockrange_count)
 857                 {
 858                         gl_state.lockrange_count = 0;
 859                         CHECKGLERROR
 860                         qglUnlockArraysEXT();
 861                         CHECKGLERROR
 862                 }
 863                 if (count && gl_supportslockarrays && gl_lockarrays.integer && r_render.integer)
 864                 {
 865                         gl_state.lockrange_first = first;
 866                         gl_state.lockrange_count = count;
 867                         CHECKGLERROR
 868                         qglLockArraysEXT(first, count);
 869                         CHECKGLERROR
 870                 }
 871         }
 872 }
 873
 874 void GL_Scissor (int x, int y, int width, int height)
 875 {
 876         CHECKGLERROR
 877         qglScissor(x, vid.height - (y + height),width,height);
 878         CHECKGLERROR
 879 }
 880
 881 void GL_ScissorTest(int state)
 882 {
 883         if(gl_state.scissortest == state)
 884                 return;
 885
 886         CHECKGLERROR
 887         if((gl_state.scissortest = state))
 888                 qglEnable(GL_SCISSOR_TEST);
 889         else
 890                 qglDisable(GL_SCISSOR_TEST);
 891         CHECKGLERROR
 892 }
 893
 894 void GL_Clear(int mask)
 895 {
 896         CHECKGLERROR
 897         qglClear(mask);CHECKGLERROR
 898 }
 899
 900 void GL_TransformToScreen(const vec4_t in, vec4_t out)
 901 {
 902         vec4_t temp;
 903         float iw;
 904         Matrix4x4_Transform4 (&backend_viewmatrix, in, temp);
 905         Matrix4x4_Transform4 (&backend_projectmatrix, temp, out);
 906         iw = 1.0f / out[3];
 907         out[0] = r_refdef.view.x + (out[0] * iw + 1.0f) * r_refdef.view.width * 0.5f;
 908         out[1] = r_refdef.view.y + r_refdef.view.height - (out[1] * iw + 1.0f) * r_refdef.view.height * 0.5f;
 909         out[2] = r_refdef.view.z + (out[2] * iw + 1.0f) * r_refdef.view.depth * 0.5f;
 910 }
 911
 912 // called at beginning of frame
 913 void R_Mesh_Start(void)
 914 {
 915         BACKENDACTIVECHECK
 916         CHECKGLERROR
 917         if (gl_printcheckerror.integer && !gl_paranoid.integer)
 918         {
 919                 Con_Printf("WARNING: gl_printcheckerror is on but gl_paranoid is off, turning it on...\n");
 920                 Cvar_SetValueQuick(&gl_paranoid, 1);
 921         }
 922         GL_Backend_ResetState();
 923 }
 924
 925 qboolean GL_Backend_CompileShader(int programobject, GLenum shadertypeenum, const char *shadertype, int numstrings, const char **strings)
 926 {
 927         int shaderobject;
 928         int shadercompiled;
 929         char compilelog[MAX_INPUTLINE];
 930         shaderobject = qglCreateShaderObjectARB(shadertypeenum);CHECKGLERROR
 931         if (!shaderobject)
 932                 return false;
 933         qglShaderSourceARB(shaderobject, numstrings, strings, NULL);CHECKGLERROR
 934         qglCompileShaderARB(shaderobject);CHECKGLERROR
 935         qglGetObjectParameterivARB(shaderobject, GL_OBJECT_COMPILE_STATUS_ARB, &shadercompiled);CHECKGLERROR
 936         qglGetInfoLogARB(shaderobject, sizeof(compilelog), NULL, compilelog);CHECKGLERROR
 937         if (compilelog[0] && developer.integer > 0)
 938         {
 939                 int i, j, pretextlines = 0;
 940                 for (i = 0;i < numstrings - 1;i++)
 941                         for (j = 0;strings[i][j];j++)
 942                                 if (strings[i][j] == '\n')
 943                                         pretextlines++;
 944                 Con_DPrintf("%s shader compile log:\n%s\n(line offset for any above warnings/errors: %i)\n", shadertype, compilelog, pretextlines);
 945         }
 946         if (!shadercompiled)
 947         {
 948                 qglDeleteObjectARB(shaderobject);CHECKGLERROR
 949                 return false;
 950         }
 951         qglAttachObjectARB(programobject, shaderobject);CHECKGLERROR
 952         qglDeleteObjectARB(shaderobject);CHECKGLERROR
 953         return true;
 954 }
 955
 956 unsigned int GL_Backend_CompileProgram(int vertexstrings_count, const char **vertexstrings_list, int geometrystrings_count, const char **geometrystrings_list, int fragmentstrings_count, const char **fragmentstrings_list)
 957 {
 958         GLint programlinked;
 959         GLuint programobject = 0;
 960         char linklog[MAX_INPUTLINE];
 961         CHECKGLERROR
 962
 963         programobject = qglCreateProgramObjectARB();CHECKGLERROR
 964         if (!programobject)
 965                 return 0;
 966
 967         if (vertexstrings_count && !GL_Backend_CompileShader(programobject, GL_VERTEX_SHADER_ARB, "vertex", vertexstrings_count, vertexstrings_list))
 968                 goto cleanup;
 969
 970 #ifdef GL_GEOMETRY_SHADER_ARB
 971         if (geometrystrings_count && !GL_Backend_CompileShader(programobject, GL_GEOMETRY_SHADER_ARB, "geometry", geometrystrings_count, geometrystrings_list))
 972                 goto cleanup;
 973 #endif
 974
 975         if (fragmentstrings_count && !GL_Backend_CompileShader(programobject, GL_FRAGMENT_SHADER_ARB, "fragment", fragmentstrings_count, fragmentstrings_list))
 976                 goto cleanup;
 977
 978         qglLinkProgramARB(programobject);CHECKGLERROR
 979         qglGetObjectParameterivARB(programobject, GL_OBJECT_LINK_STATUS_ARB, &programlinked);CHECKGLERROR
 980         qglGetInfoLogARB(programobject, sizeof(linklog), NULL, linklog);CHECKGLERROR
 981         if (linklog[0])
 982         {
 983                 Con_DPrintf("program link log:\n%s\n", linklog);
 984                 // software vertex shader is ok but software fragment shader is WAY
 985                 // too slow, fail program if so.
 986                 // NOTE: this string might be ATI specific, but that's ok because the
 987                 // ATI R300 chip (Radeon 9500-9800/X300) is the most likely to use a
 988                 // software fragment shader due to low instruction and dependent
 989                 // texture limits.
 990                 if (strstr(linklog, "fragment shader will run in software"))
 991                         programlinked = false;
 992         }
 993         if (!programlinked)
 994                 goto cleanup;
 995         return programobject;
 996 cleanup:
 997         qglDeleteObjectARB(programobject);CHECKGLERROR
 998         return 0;
 999 }
1000
1001 void GL_Backend_FreeProgram(unsigned int prog)
1002 {
1003         CHECKGLERROR
1004         qglDeleteObjectARB(prog);
1005         CHECKGLERROR
1006 }
1007
1008 int gl_backend_rebindtextures;
1009
1010 void GL_Backend_RenumberElements(int *out, int count, const int *in, int offset)
1011 {
1012         int i;
1013         if (offset)
1014         {
1015                 for (i = 0;i < count;i++)
1016                         *out++ = *in++ + offset;
1017         }
1018         else
1019                 memcpy(out, in, sizeof(*out) * count);
1020 }
1021
1022 // renders triangles using vertices from the active arrays
1023 int paranoidblah = 0;
1024 void R_Mesh_Draw(int firstvertex, int numvertices, int numtriangles, const int *elements, int bufferobject, size_t bufferoffset)
1025 {
1026         unsigned int numelements = numtriangles * 3;
1027         if (numvertices < 3 || numtriangles < 1)
1028         {
1029                 Con_Printf("R_Mesh_Draw(%d, %d, %d, %8p, %i, %p);\n", firstvertex, numvertices, numtriangles, elements, bufferobject, (void *)bufferoffset);
1030                 return;
1031         }
1032         if (gl_vbo.integer != 1)
1033                 bufferobject = 0;
1034         CHECKGLERROR
1035         r_refdef.stats.meshes++;
1036         r_refdef.stats.meshes_elements += numelements;
1037         if (gl_paranoid.integer)
1038         {
1039                 unsigned int i, j, size;
1040                 const int *p;
1041                 // note: there's no validation done here on buffer objects because it
1042                 // is somewhat difficult to get at the data, and gl_paranoid can be
1043                 // used without buffer objects if the need arises
1044                 // (the data could be gotten using glMapBuffer but it would be very
1045                 //  slow due to uncachable video memory reads)
1046                 if (!qglIsEnabled(GL_VERTEX_ARRAY))
1047                         Con_Print("R_Mesh_Draw: vertex array not enabled\n");
1048                 CHECKGLERROR
1049                 if (gl_state.pointer_vertex)
1050                         for (j = 0, size = numvertices * 3, p = (int *)((float *)gl_state.pointer_vertex + firstvertex * 3);j < size;j++, p++)
1051                                 paranoidblah += *p;
1052                 if (gl_state.pointer_color_enabled)
1053                 {
1054                         if (!qglIsEnabled(GL_COLOR_ARRAY))
1055                                 Con_Print("R_Mesh_Draw: color array set but not enabled\n");
1056                         CHECKGLERROR
1057                         if (gl_state.pointer_color && gl_state.pointer_color_enabled)
1058                                 for (j = 0, size = numvertices * 4, p = (int *)((float *)gl_state.pointer_color + firstvertex * 4);j < size;j++, p++)
1059                                         paranoidblah += *p;
1060                 }
1061                 for (i = 0;i < backendarrayunits;i++)
1062                 {
1063                         if (gl_state.units[i].arrayenabled)
1064                         {
1065                                 GL_ClientActiveTexture(i);
1066                                 if (!qglIsEnabled(GL_TEXTURE_COORD_ARRAY))
1067                                         Con_Print("R_Mesh_Draw: texcoord array set but not enabled\n");
1068                                 CHECKGLERROR
1069                                 if (gl_state.units[i].pointer_texcoord && gl_state.units[i].arrayenabled)
1070                                         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++)
1071                                                 paranoidblah += *p;
1072                         }
1073                 }
1074                 for (i = 0;i < (unsigned int) numtriangles * 3;i++)
1075                 {
1076                         if (elements[i] < firstvertex || elements[i] >= firstvertex + numvertices)
1077                         {
1078                                 Con_Printf("R_Mesh_Draw: invalid vertex index %i (outside range %i - %i) in elements list\n", elements[i], firstvertex, firstvertex + numvertices);
1079                                 return;
1080                         }
1081                 }
1082                 CHECKGLERROR
1083         }
1084         if (r_render.integer)
1085         {
1086                 CHECKGLERROR
1087                 if (gl_mesh_testmanualfeeding.integer)
1088                 {
1089                         unsigned int i, j;
1090                         const GLfloat *p;
1091                         qglBegin(GL_TRIANGLES);
1092                         for (i = 0;i < (unsigned int) numtriangles * 3;i++)
1093                         {
1094                                 for (j = 0;j < backendarrayunits;j++)
1095                                 {
1096                                         if (gl_state.units[j].pointer_texcoord && gl_state.units[j].arrayenabled)
1097                                         {
1098                                                 if (backendarrayunits > 1)
1099                                                 {
1100                                                         if (gl_state.units[j].arraycomponents == 4)
1101                                                         {
1102                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 4;
1103                                                                 qglMultiTexCoord4f(GL_TEXTURE0_ARB + j, p[0], p[1], p[2], p[3]);
1104                                                         }
1105                                                         else if (gl_state.units[j].arraycomponents == 3)
1106                                                         {
1107                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 3;
1108                                                                 qglMultiTexCoord3f(GL_TEXTURE0_ARB + j, p[0], p[1], p[2]);
1109                                                         }
1110                                                         else if (gl_state.units[j].arraycomponents == 2)
1111                                                         {
1112                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 2;
1113                                                                 qglMultiTexCoord2f(GL_TEXTURE0_ARB + j, p[0], p[1]);
1114                                                         }
1115                                                         else
1116                                                         {
1117                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 1;
1118                                                                 qglMultiTexCoord1f(GL_TEXTURE0_ARB + j, p[0]);
1119                                                         }
1120                                                 }
1121                                                 else
1122                                                 {
1123                                                         if (gl_state.units[j].arraycomponents == 4)
1124                                                         {
1125                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 4;
1126                                                                 qglTexCoord4f(p[0], p[1], p[2], p[3]);
1127                                                         }
1128                                                         else if (gl_state.units[j].arraycomponents == 3)
1129                                                         {
1130                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 3;
1131                                                                 qglTexCoord3f(p[0], p[1], p[2]);
1132                                                         }
1133                                                         else if (gl_state.units[j].arraycomponents == 2)
1134                                                         {
1135                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 2;
1136                                                                 qglTexCoord2f(p[0], p[1]);
1137                                                         }
1138                                                         else
1139                                                         {
1140                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + elements[i] * 1;
1141                                                                 qglTexCoord1f(p[0]);
1142                                                         }
1143                                                 }
1144                                         }
1145                                 }
1146                                 if (gl_state.pointer_color && gl_state.pointer_color_enabled)
1147                                 {
1148                                         p = ((const GLfloat *)(gl_state.pointer_color)) + elements[i] * 4;
1149                                         qglColor4f(p[0], p[1], p[2], p[3]);
1150                                 }
1151                                 p = ((const GLfloat *)(gl_state.pointer_vertex)) + elements[i] * 3;
1152                                 qglVertex3f(p[0], p[1], p[2]);
1153                         }
1154                         qglEnd();
1155                         CHECKGLERROR
1156                 }
1157                 else if (gl_mesh_testarrayelement.integer)
1158                 {
1159                         int i;
1160                         qglBegin(GL_TRIANGLES);
1161                         for (i = 0;i < numtriangles * 3;i++)
1162                         {
1163                                 qglArrayElement(elements[i]);
1164                         }
1165                         qglEnd();
1166                         CHECKGLERROR
1167                 }
1168                 else if (gl_mesh_drawrangeelements.integer && qglDrawRangeElements != NULL)
1169                 {
1170                         GL_BindEBO(bufferobject);
1171                         qglDrawRangeElements(GL_TRIANGLES, firstvertex, firstvertex + numvertices, numelements, GL_UNSIGNED_INT, bufferobject ? (void *)bufferoffset : elements);
1172                         CHECKGLERROR
1173                 }
1174                 else
1175                 {
1176                         GL_BindEBO(bufferobject);
1177                         qglDrawElements(GL_TRIANGLES, numelements, GL_UNSIGNED_INT, bufferobject ? (void *)bufferoffset : elements);
1178                         CHECKGLERROR
1179                 }
1180         }
1181 }
1182
1183 // restores backend state, used when done with 3D rendering
1184 void R_Mesh_Finish(void)
1185 {
1186         unsigned int i;
1187         BACKENDACTIVECHECK
1188         CHECKGLERROR
1189         GL_LockArrays(0, 0);
1190         CHECKGLERROR
1191
1192         for (i = 0;i < backendimageunits;i++)
1193         {
1194                 GL_ActiveTexture(i);
1195                 qglBindTexture(GL_TEXTURE_1D, 0);CHECKGLERROR
1196                 qglBindTexture(GL_TEXTURE_2D, 0);CHECKGLERROR
1197                 if (gl_texture3d)
1198                 {
1199                         qglBindTexture(GL_TEXTURE_3D, 0);CHECKGLERROR
1200                 }
1201                 if (gl_texturecubemap)
1202                 {
1203                         qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, 0);CHECKGLERROR
1204                 }
1205         }
1206         for (i = 0;i < backendarrayunits;i++)
1207         {
1208                 GL_ActiveTexture(backendarrayunits - 1 - i);
1209                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
1210         }
1211         for (i = 0;i < backendunits;i++)
1212         {
1213                 GL_ActiveTexture(backendunits - 1 - i);
1214                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
1215                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
1216                 if (gl_texture3d)
1217                 {
1218                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
1219                 }
1220                 if (gl_texturecubemap)
1221                 {
1222                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
1223                 }
1224                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
1225                 if (gl_combine.integer)
1226                 {
1227                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
1228                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
1229                 }
1230         }
1231         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
1232         qglDisableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
1233
1234         qglDisable(GL_BLEND);CHECKGLERROR
1235         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
1236         qglDepthMask(GL_TRUE);CHECKGLERROR
1237         qglBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);CHECKGLERROR
1238 }
1239
1240 int R_Mesh_CreateStaticBufferObject(unsigned int target, void *data, size_t size, const char *name)
1241 {
1242         gl_bufferobjectinfo_t *info;
1243         GLuint bufferobject;
1244
1245         if (!gl_vbo.integer)
1246                 return 0;
1247
1248         qglGenBuffersARB(1, &bufferobject);
1249         switch(target)
1250         {
1251         case GL_ELEMENT_ARRAY_BUFFER_ARB: GL_BindEBO(bufferobject);break;
1252         case GL_ARRAY_BUFFER_ARB: GL_BindVBO(bufferobject);break;
1253         default: Sys_Error("R_Mesh_CreateStaticBufferObject: unknown target type %i\n", target);return 0;
1254         }
1255         qglBufferDataARB(target, size, data, GL_STATIC_DRAW_ARB);
1256
1257         info = Mem_ExpandableArray_AllocRecord(&gl_bufferobjectinfoarray);
1258         memset(info, 0, sizeof(*info));
1259         info->target = target;
1260         info->object = bufferobject;
1261         info->size = size;
1262         strlcpy(info->name, name, sizeof(info->name));
1263
1264         return (int)bufferobject;
1265 }
1266
1267 void R_Mesh_DestroyBufferObject(int bufferobject)
1268 {
1269         int i, endindex;
1270         gl_bufferobjectinfo_t *info;
1271
1272         qglDeleteBuffersARB(1, (GLuint *)&bufferobject);
1273
1274         endindex = Mem_ExpandableArray_IndexRange(&gl_bufferobjectinfoarray);
1275         for (i = 0;i < endindex;i++)
1276         {
1277                 info = Mem_ExpandableArray_RecordAtIndex(&gl_bufferobjectinfoarray, i);
1278                 if (!info)
1279                         continue;
1280                 if (info->object == bufferobject)
1281                 {
1282                         Mem_ExpandableArray_FreeRecord(&gl_bufferobjectinfoarray, (void *)info);
1283                         break;
1284                 }
1285         }
1286 }
1287
1288 void GL_Mesh_ListVBOs(qboolean printeach)
1289 {
1290         int i, endindex;
1291         size_t ebocount = 0, ebomemory = 0;
1292         size_t vbocount = 0, vbomemory = 0;
1293         gl_bufferobjectinfo_t *info;
1294         endindex = Mem_ExpandableArray_IndexRange(&gl_bufferobjectinfoarray);
1295         for (i = 0;i < endindex;i++)
1296         {
1297                 info = Mem_ExpandableArray_RecordAtIndex(&gl_bufferobjectinfoarray, i);
1298                 if (!info)
1299                         continue;
1300                 switch(info->target)
1301                 {
1302                 case GL_ELEMENT_ARRAY_BUFFER_ARB: ebocount++;ebomemory += info->size;if (printeach) Con_Printf("EBO #%i %s = %i bytes\n", info->object, info->name, (int)info->size);break;
1303                 case GL_ARRAY_BUFFER_ARB: vbocount++;vbomemory += info->size;if (printeach) Con_Printf("VBO #%i %s = %i bytes\n", info->object, info->name, (int)info->size);break;
1304                 default: Con_Printf("gl_vbostats: unknown target type %i\n", info->target);break;
1305                 }
1306         }
1307         Con_Printf("vertex buffers: %i element buffers totalling %i bytes (%.3f MB), %i vertex buffers totalling %i bytes (%.3f MB), combined %i bytes (%.3fMB)\n", (int)ebocount, (int)ebomemory, ebomemory / 1048576.0, (int)vbocount, (int)vbomemory, vbomemory / 1048576.0, (int)(ebomemory + vbomemory), (ebomemory + vbomemory) / 1048576.0);
1308 }
1309
1310 void R_Mesh_Matrix(const matrix4x4_t *matrix)
1311 {
1312         if (memcmp(matrix, &backend_modelmatrix, sizeof(matrix4x4_t)))
1313         {
1314                 double glmatrix[16];
1315                 backend_modelmatrix = *matrix;
1316                 Matrix4x4_Concat(&backend_modelviewmatrix, &backend_viewmatrix, matrix);
1317                 Matrix4x4_ToArrayDoubleGL(&backend_modelviewmatrix, glmatrix);
1318                 CHECKGLERROR
1319                 qglLoadMatrixd(glmatrix);CHECKGLERROR
1320         }
1321 }
1322
1323 void R_Mesh_VertexPointer(const float *vertex3f, int bufferobject, size_t bufferoffset)
1324 {
1325         if (!gl_vbo.integer)
1326                 bufferobject = 0;
1327         if (gl_state.pointer_vertex != vertex3f || gl_state.pointer_vertex_buffer != bufferobject || gl_state.pointer_vertex_offset != bufferoffset)
1328         {
1329                 gl_state.pointer_vertex = vertex3f;
1330                 gl_state.pointer_vertex_buffer = bufferobject;
1331                 gl_state.pointer_vertex_offset = bufferoffset;
1332                 CHECKGLERROR
1333                 GL_BindVBO(bufferobject);
1334                 qglVertexPointer(3, GL_FLOAT, sizeof(float[3]), bufferobject ? (void *)bufferoffset : vertex3f);CHECKGLERROR
1335         }
1336 }
1337
1338 void R_Mesh_ColorPointer(const float *color4f, int bufferobject, size_t bufferoffset)
1339 {
1340         // note: this can not rely on bufferobject to decide whether a color array
1341         // is supplied, because surfmesh_t shares one vbo for all arrays, which
1342         // means that a valid vbo may be supplied even if there is no color array.
1343         if (color4f)
1344         {
1345                 if (!gl_vbo.integer)
1346                         bufferobject = 0;
1347                 // caller wants color array enabled
1348                 if (!gl_state.pointer_color_enabled)
1349                 {
1350                         gl_state.pointer_color_enabled = true;
1351                         CHECKGLERROR
1352                         qglEnableClientState(GL_COLOR_ARRAY);CHECKGLERROR
1353                 }
1354                 if (gl_state.pointer_color != color4f || gl_state.pointer_color_buffer != bufferobject || gl_state.pointer_color_offset != bufferoffset)
1355                 {
1356                         gl_state.pointer_color = color4f;
1357                         gl_state.pointer_color_buffer = bufferobject;
1358                         gl_state.pointer_color_offset = bufferoffset;
1359                         CHECKGLERROR
1360                         GL_BindVBO(bufferobject);
1361                         qglColorPointer(4, GL_FLOAT, sizeof(float[4]), bufferobject ? (void *)bufferoffset : color4f);CHECKGLERROR
1362                 }
1363         }
1364         else
1365         {
1366                 // caller wants color array disabled
1367                 if (gl_state.pointer_color_enabled)
1368                 {
1369                         gl_state.pointer_color_enabled = false;
1370                         CHECKGLERROR
1371                         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
1372                         // when color array is on the glColor gets trashed, set it again
1373                         qglColor4f(gl_state.color4f[0], gl_state.color4f[1], gl_state.color4f[2], gl_state.color4f[3]);CHECKGLERROR
1374                 }
1375         }
1376 }
1377
1378 void R_Mesh_TexCoordPointer(unsigned int unitnum, unsigned int numcomponents, const float *texcoord, int bufferobject, size_t bufferoffset)
1379 {
1380         gltextureunit_t *unit = gl_state.units + unitnum;
1381         // update array settings
1382         CHECKGLERROR
1383         // note: there is no need to check bufferobject here because all cases
1384         // that involve a valid bufferobject also supply a texcoord array
1385         if (texcoord)
1386         {
1387                 if (!gl_vbo.integer)
1388                         bufferobject = 0;
1389                 // texture array unit is enabled, enable the array
1390                 if (!unit->arrayenabled)
1391                 {
1392                         unit->arrayenabled = true;
1393                         GL_ClientActiveTexture(unitnum);
1394                         qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
1395                 }
1396                 // texcoord array
1397                 if (unit->pointer_texcoord != texcoord || unit->pointer_texcoord_buffer != bufferobject || unit->pointer_texcoord_offset != bufferoffset || unit->arraycomponents != numcomponents)
1398                 {
1399                         unit->pointer_texcoord = texcoord;
1400                         unit->pointer_texcoord_buffer = bufferobject;
1401                         unit->pointer_texcoord_offset = bufferoffset;
1402                         unit->arraycomponents = numcomponents;
1403                         GL_ClientActiveTexture(unitnum);
1404                         GL_BindVBO(bufferobject);
1405                         qglTexCoordPointer(unit->arraycomponents, GL_FLOAT, sizeof(float) * unit->arraycomponents, bufferobject ? (void *)bufferoffset : texcoord);CHECKGLERROR
1406                 }
1407         }
1408         else
1409         {
1410                 // texture array unit is disabled, disable the array
1411                 if (unit->arrayenabled)
1412                 {
1413                         unit->arrayenabled = false;
1414                         GL_ClientActiveTexture(unitnum);
1415                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
1416                 }
1417         }
1418 }
1419
1420 void R_Mesh_TexBindAll(unsigned int unitnum, int tex1d, int tex2d, int tex3d, int texcubemap)
1421 {
1422         gltextureunit_t *unit = gl_state.units + unitnum;
1423         if (unitnum >= backendimageunits)
1424                 return;
1425         // update 1d texture binding
1426         if (unit->t1d != tex1d)
1427         {
1428                 GL_ActiveTexture(unitnum);
1429                 if (unitnum < backendunits)
1430                 {
1431                         if (tex1d)
1432                         {
1433                                 if (unit->t1d == 0)
1434                                 {
1435                                         qglEnable(GL_TEXTURE_1D);CHECKGLERROR
1436                                 }
1437                         }
1438                         else
1439                         {
1440                                 if (unit->t1d)
1441                                 {
1442                                         qglDisable(GL_TEXTURE_1D);CHECKGLERROR
1443                                 }
1444                         }
1445                 }
1446                 unit->t1d = tex1d;
1447                 qglBindTexture(GL_TEXTURE_1D, unit->t1d);CHECKGLERROR
1448         }
1449         // update 2d texture binding
1450         if (unit->t2d != tex2d)
1451         {
1452                 GL_ActiveTexture(unitnum);
1453                 if (unitnum < backendunits)
1454                 {
1455                         if (tex2d)
1456                         {
1457                                 if (unit->t2d == 0)
1458                                 {
1459                                         qglEnable(GL_TEXTURE_2D);CHECKGLERROR
1460                                 }
1461                         }
1462                         else
1463                         {
1464                                 if (unit->t2d)
1465                                 {
1466                                         qglDisable(GL_TEXTURE_2D);CHECKGLERROR
1467                                 }
1468                         }
1469                 }
1470                 unit->t2d = tex2d;
1471                 qglBindTexture(GL_TEXTURE_2D, unit->t2d);CHECKGLERROR
1472         }
1473         // update 3d texture binding
1474         if (unit->t3d != tex3d)
1475         {
1476                 GL_ActiveTexture(unitnum);
1477                 if (unitnum < backendunits)
1478                 {
1479                         if (tex3d)
1480                         {
1481                                 if (unit->t3d == 0)
1482                                 {
1483                                         qglEnable(GL_TEXTURE_3D);CHECKGLERROR
1484                                 }
1485                         }
1486                         else
1487                         {
1488                                 if (unit->t3d)
1489                                 {
1490                                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
1491                                 }
1492                         }
1493                 }
1494                 unit->t3d = tex3d;
1495                 qglBindTexture(GL_TEXTURE_3D, unit->t3d);CHECKGLERROR
1496         }
1497         // update cubemap texture binding
1498         if (unit->tcubemap != texcubemap)
1499         {
1500                 GL_ActiveTexture(unitnum);
1501                 if (unitnum < backendunits)
1502                 {
1503                         if (texcubemap)
1504                         {
1505                                 if (unit->tcubemap == 0)
1506                                 {
1507                                         qglEnable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
1508                                 }
1509                         }
1510                         else
1511                         {
1512                                 if (unit->tcubemap)
1513                                 {
1514                                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
1515                                 }
1516                         }
1517                 }
1518                 unit->tcubemap = texcubemap;
1519                 qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, unit->tcubemap);CHECKGLERROR
1520         }
1521 }
1522
1523 void R_Mesh_TexBind1D(unsigned int unitnum, int texnum)
1524 {
1525         gltextureunit_t *unit = gl_state.units + unitnum;
1526         if (unitnum >= backendimageunits)
1527                 return;
1528         // update 1d texture binding
1529         if (unit->t1d != texnum)
1530         {
1531                 GL_ActiveTexture(unitnum);
1532                 if (unitnum < backendunits)
1533                 {
1534                         if (texnum)
1535                         {
1536                                 if (unit->t1d == 0)
1537                                 {
1538                                         qglEnable(GL_TEXTURE_1D);CHECKGLERROR
1539                                 }
1540                         }
1541                         else
1542                         {
1543                                 if (unit->t1d)
1544                                 {
1545                                         qglDisable(GL_TEXTURE_1D);CHECKGLERROR
1546                                 }
1547                         }
1548                 }
1549                 unit->t1d = texnum;
1550                 qglBindTexture(GL_TEXTURE_1D, unit->t1d);CHECKGLERROR
1551         }
1552         // update 2d texture binding
1553         if (unit->t2d)
1554         {
1555                 GL_ActiveTexture(unitnum);
1556                 if (unitnum < backendunits)
1557                 {
1558                         if (unit->t2d)
1559                         {
1560                                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
1561                         }
1562                 }
1563                 unit->t2d = 0;
1564                 qglBindTexture(GL_TEXTURE_2D, unit->t2d);CHECKGLERROR
1565         }
1566         // update 3d texture binding
1567         if (unit->t3d)
1568         {
1569                 GL_ActiveTexture(unitnum);
1570                 if (unitnum < backendunits)
1571                 {
1572                         if (unit->t3d)
1573                         {
1574                                 qglDisable(GL_TEXTURE_3D);CHECKGLERROR
1575                         }
1576                 }
1577                 unit->t3d = 0;
1578                 qglBindTexture(GL_TEXTURE_3D, unit->t3d);CHECKGLERROR
1579         }
1580         // update cubemap texture binding
1581         if (unit->tcubemap)
1582         {
1583                 GL_ActiveTexture(unitnum);
1584                 if (unitnum < backendunits)
1585                 {
1586                         if (unit->tcubemap)
1587                         {
1588                                 qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
1589                         }
1590                 }
1591                 unit->tcubemap = 0;
1592                 qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, unit->tcubemap);CHECKGLERROR
1593         }
1594 }
1595
1596 void R_Mesh_TexBind(unsigned int unitnum, int texnum)
1597 {
1598         gltextureunit_t *unit = gl_state.units + unitnum;
1599         if (unitnum >= backendimageunits)
1600                 return;
1601         // update 1d texture binding
1602         if (unit->t1d)
1603         {
1604                 GL_ActiveTexture(unitnum);
1605                 if (unitnum < backendunits)
1606                 {
1607                         if (unit->t1d)
1608                         {
1609                                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
1610                         }
1611                 }
1612                 unit->t1d = 0;
1613                 qglBindTexture(GL_TEXTURE_1D, unit->t1d);CHECKGLERROR
1614         }
1615         // update 2d texture binding
1616         if (unit->t2d != texnum)
1617         {
1618                 GL_ActiveTexture(unitnum);
1619                 if (unitnum < backendunits)
1620                 {
1621                         if (texnum)
1622                         {
1623                                 if (unit->t2d == 0)
1624                                 {
1625                                         qglEnable(GL_TEXTURE_2D);CHECKGLERROR
1626                                 }
1627                         }
1628                         else
1629                         {
1630                                 if (unit->t2d)
1631                                 {
1632                                         qglDisable(GL_TEXTURE_2D);CHECKGLERROR
1633                                 }
1634                         }
1635                 }
1636                 unit->t2d = texnum;
1637                 qglBindTexture(GL_TEXTURE_2D, unit->t2d);CHECKGLERROR
1638         }
1639         // update 3d texture binding
1640         if (unit->t3d)
1641         {
1642                 GL_ActiveTexture(unitnum);
1643                 if (unitnum < backendunits)
1644                 {
1645                         if (unit->t3d)
1646                         {
1647                                 qglDisable(GL_TEXTURE_3D);CHECKGLERROR
1648                         }
1649                 }
1650                 unit->t3d = 0;
1651                 qglBindTexture(GL_TEXTURE_3D, unit->t3d);CHECKGLERROR
1652         }
1653         // update cubemap texture binding
1654         if (unit->tcubemap != 0)
1655         {
1656                 GL_ActiveTexture(unitnum);
1657                 if (unitnum < backendunits)
1658                 {
1659                         if (unit->tcubemap)
1660                         {
1661                                 qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
1662                         }
1663                 }
1664                 unit->tcubemap = 0;
1665                 qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, unit->tcubemap);CHECKGLERROR
1666         }
1667 }
1668
1669 void R_Mesh_TexBind3D(unsigned int unitnum, int texnum)
1670 {
1671         gltextureunit_t *unit = gl_state.units + unitnum;
1672         if (unitnum >= backendimageunits)
1673                 return;
1674         // update 1d texture binding
1675         if (unit->t1d)
1676         {
1677                 GL_ActiveTexture(unitnum);
1678                 if (unitnum < backendunits)
1679                 {
1680                         if (unit->t1d)
1681                         {
1682                                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
1683                         }
1684                 }
1685                 unit->t1d = 0;
1686                 qglBindTexture(GL_TEXTURE_1D, unit->t1d);CHECKGLERROR
1687         }
1688         // update 2d texture binding
1689         if (unit->t2d)
1690         {
1691                 GL_ActiveTexture(unitnum);
1692                 if (unitnum < backendunits)
1693                 {
1694                         if (unit->t2d)
1695                         {
1696                                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
1697                         }
1698                 }
1699                 unit->t2d = 0;
1700                 qglBindTexture(GL_TEXTURE_2D, unit->t2d);CHECKGLERROR
1701         }
1702         // update 3d texture binding
1703         if (unit->t3d != texnum)
1704         {
1705                 GL_ActiveTexture(unitnum);
1706                 if (unitnum < backendunits)
1707                 {
1708                         if (texnum)
1709                         {
1710                                 if (unit->t3d == 0)
1711                                 {
1712                                         qglEnable(GL_TEXTURE_3D);CHECKGLERROR
1713                                 }
1714                         }
1715                         else
1716                         {
1717                                 if (unit->t3d)
1718                                 {
1719                                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
1720                                 }
1721                         }
1722                 }
1723                 unit->t3d = texnum;
1724                 qglBindTexture(GL_TEXTURE_3D, unit->t3d);CHECKGLERROR
1725         }
1726         // update cubemap texture binding
1727         if (unit->tcubemap != 0)
1728         {
1729                 GL_ActiveTexture(unitnum);
1730                 if (unitnum < backendunits)
1731                 {
1732                         if (unit->tcubemap)
1733                         {
1734                                 qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
1735                         }
1736                 }
1737                 unit->tcubemap = 0;
1738                 qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, unit->tcubemap);CHECKGLERROR
1739         }
1740 }
1741
1742 void R_Mesh_TexBindCubeMap(unsigned int unitnum, int texnum)
1743 {
1744         gltextureunit_t *unit = gl_state.units + unitnum;
1745         if (unitnum >= backendimageunits)
1746                 return;
1747         // update 1d texture binding
1748         if (unit->t1d)
1749         {
1750                 GL_ActiveTexture(unitnum);
1751                 if (unitnum < backendunits)
1752                 {
1753                         if (unit->t1d)
1754                         {
1755                                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
1756                         }
1757                 }
1758                 unit->t1d = 0;
1759                 qglBindTexture(GL_TEXTURE_1D, unit->t1d);CHECKGLERROR
1760         }
1761         // update 2d texture binding
1762         if (unit->t2d)
1763         {
1764                 GL_ActiveTexture(unitnum);
1765                 if (unitnum < backendunits)
1766                 {
1767                         if (unit->t2d)
1768                         {
1769                                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
1770                         }
1771                 }
1772                 unit->t2d = 0;
1773                 qglBindTexture(GL_TEXTURE_2D, unit->t2d);CHECKGLERROR
1774         }
1775         // update 3d texture binding
1776         if (unit->t3d)
1777         {
1778                 GL_ActiveTexture(unitnum);
1779                 if (unitnum < backendunits)
1780                 {
1781                         if (unit->t3d)
1782                         {
1783                                 qglDisable(GL_TEXTURE_3D);CHECKGLERROR
1784                         }
1785                 }
1786                 unit->t3d = 0;
1787                 qglBindTexture(GL_TEXTURE_3D, unit->t3d);CHECKGLERROR
1788         }
1789         // update cubemap texture binding
1790         if (unit->tcubemap != texnum)
1791         {
1792                 GL_ActiveTexture(unitnum);
1793                 if (unitnum < backendunits)
1794                 {
1795                         if (texnum)
1796                         {
1797                                 if (unit->tcubemap == 0)
1798                                 {
1799                                         qglEnable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
1800                                 }
1801                         }
1802                         else
1803                         {
1804                                 if (unit->tcubemap)
1805                                 {
1806                                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
1807                                 }
1808                         }
1809                 }
1810                 unit->tcubemap = texnum;
1811                 qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, unit->tcubemap);CHECKGLERROR
1812         }
1813 }
1814
1815 void R_Mesh_TexMatrix(unsigned int unitnum, const matrix4x4_t *matrix)
1816 {
1817         gltextureunit_t *unit = gl_state.units + unitnum;
1818         if (matrix->m[3][3])
1819         {
1820                 // texmatrix specified, check if it is different
1821                 if (!unit->texmatrixenabled || memcmp(&unit->matrix, matrix, sizeof(matrix4x4_t)))
1822                 {
1823                         double glmatrix[16];
1824                         unit->texmatrixenabled = true;
1825                         unit->matrix = *matrix;
1826                         CHECKGLERROR
1827                         Matrix4x4_ToArrayDoubleGL(&unit->matrix, glmatrix);
1828                         qglMatrixMode(GL_TEXTURE);CHECKGLERROR
1829                         GL_ActiveTexture(unitnum);
1830                         qglLoadMatrixd(glmatrix);CHECKGLERROR
1831                         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
1832                 }
1833         }
1834         else
1835         {
1836                 // no texmatrix specified, revert to identity
1837                 if (unit->texmatrixenabled)
1838                 {
1839                         unit->texmatrixenabled = false;
1840                         CHECKGLERROR
1841                         qglMatrixMode(GL_TEXTURE);CHECKGLERROR
1842                         GL_ActiveTexture(unitnum);
1843                         qglLoadIdentity();CHECKGLERROR
1844                         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
1845                 }
1846         }
1847 }
1848
1849 void R_Mesh_TexCombine(unsigned int unitnum, int combinergb, int combinealpha, int rgbscale, int alphascale)
1850 {
1851         gltextureunit_t *unit = gl_state.units + unitnum;
1852         CHECKGLERROR
1853         if (gl_combine.integer)
1854         {
1855                 // GL_ARB_texture_env_combine
1856                 if (!combinergb)
1857                         combinergb = GL_MODULATE;
1858                 if (!combinealpha)
1859                         combinealpha = GL_MODULATE;
1860                 if (!rgbscale)
1861                         rgbscale = 1;
1862                 if (!alphascale)
1863                         alphascale = 1;
1864                 if (unit->combinergb != combinergb)
1865                 {
1866                         unit->combinergb = combinergb;
1867                         GL_ActiveTexture(unitnum);
1868                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, unit->combinergb);CHECKGLERROR
1869                 }
1870                 if (unit->combinealpha != combinealpha)
1871                 {
1872                         unit->combinealpha = combinealpha;
1873                         GL_ActiveTexture(unitnum);
1874                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, unit->combinealpha);CHECKGLERROR
1875                 }
1876                 if (unit->rgbscale != rgbscale)
1877                 {
1878                         GL_ActiveTexture(unitnum);
1879                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, (unit->rgbscale = rgbscale));CHECKGLERROR
1880                 }
1881                 if (unit->alphascale != alphascale)
1882                 {
1883                         GL_ActiveTexture(unitnum);
1884                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, (unit->alphascale = alphascale));CHECKGLERROR
1885                 }
1886         }
1887         else
1888         {
1889                 // normal GL texenv
1890                 if (!combinergb)
1891                         combinergb = GL_MODULATE;
1892                 if (unit->combinergb != combinergb)
1893                 {
1894                         unit->combinergb = combinergb;
1895                         GL_ActiveTexture(unitnum);
1896                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, unit->combinergb);CHECKGLERROR
1897                 }
1898         }
1899 }
1900
1901 void R_Mesh_TextureState(const rmeshstate_t *m)
1902 {
1903         unsigned int i;
1904
1905         BACKENDACTIVECHECK
1906
1907         CHECKGLERROR
1908         if (gl_backend_rebindtextures)
1909         {
1910                 gl_backend_rebindtextures = false;
1911                 GL_SetupTextureState();
1912                 CHECKGLERROR
1913         }
1914
1915         for (i = 0;i < backendimageunits;i++)
1916                 R_Mesh_TexBindAll(i, m->tex1d[i], m->tex[i], m->tex3d[i], m->texcubemap[i]);
1917         for (i = 0;i < backendarrayunits;i++)
1918         {
1919                 if (m->pointer_texcoord3f[i])
1920                         R_Mesh_TexCoordPointer(i, 3, m->pointer_texcoord3f[i], m->pointer_texcoord_bufferobject[i], m->pointer_texcoord_bufferoffset[i]);
1921                 else
1922                         R_Mesh_TexCoordPointer(i, 2, m->pointer_texcoord[i], m->pointer_texcoord_bufferobject[i], m->pointer_texcoord_bufferoffset[i]);
1923         }
1924         for (i = 0;i < backendunits;i++)
1925         {
1926                 R_Mesh_TexMatrix(i, &m->texmatrix[i]);
1927                 R_Mesh_TexCombine(i, m->texcombinergb[i], m->texcombinealpha[i], m->texrgbscale[i], m->texalphascale[i]);
1928         }
1929         CHECKGLERROR
1930 }
1931
1932 void R_Mesh_ResetTextureState(void)
1933 {
1934         unsigned int unitnum;
1935
1936         BACKENDACTIVECHECK
1937
1938         CHECKGLERROR
1939         if (gl_backend_rebindtextures)
1940         {
1941                 gl_backend_rebindtextures = false;
1942                 GL_SetupTextureState();
1943                 CHECKGLERROR
1944         }
1945
1946         for (unitnum = 0;unitnum < backendimageunits;unitnum++)
1947         {
1948                 gltextureunit_t *unit = gl_state.units + unitnum;
1949                 // update 1d texture binding
1950                 if (unit->t1d)
1951                 {
1952                         GL_ActiveTexture(unitnum);
1953                         if (unitnum < backendunits)
1954                         {
1955                                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
1956                         }
1957                         unit->t1d = 0;
1958                         qglBindTexture(GL_TEXTURE_1D, unit->t1d);CHECKGLERROR
1959                 }
1960                 // update 2d texture binding
1961                 if (unit->t2d)
1962                 {
1963                         GL_ActiveTexture(unitnum);
1964                         if (unitnum < backendunits)
1965                         {
1966                                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
1967                         }
1968                         unit->t2d = 0;
1969                         qglBindTexture(GL_TEXTURE_2D, unit->t2d);CHECKGLERROR
1970                 }
1971                 // update 3d texture binding
1972                 if (unit->t3d)
1973                 {
1974                         GL_ActiveTexture(unitnum);
1975                         if (unitnum < backendunits)
1976                         {
1977                                 qglDisable(GL_TEXTURE_3D);CHECKGLERROR
1978                         }
1979                         unit->t3d = 0;
1980                         qglBindTexture(GL_TEXTURE_3D, unit->t3d);CHECKGLERROR
1981                 }
1982                 // update cubemap texture binding
1983                 if (unit->tcubemap)
1984                 {
1985                         GL_ActiveTexture(unitnum);
1986                         if (unitnum < backendunits)
1987                         {
1988                                 qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
1989                         }
1990                         unit->tcubemap = 0;
1991                         qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, unit->tcubemap);CHECKGLERROR
1992                 }
1993         }
1994         for (unitnum = 0;unitnum < backendarrayunits;unitnum++)
1995         {
1996                 gltextureunit_t *unit = gl_state.units + unitnum;
1997                 // texture array unit is disabled, disable the array
1998                 if (unit->arrayenabled)
1999                 {
2000                         unit->arrayenabled = false;
2001                         GL_ClientActiveTexture(unitnum);
2002                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
2003                 }
2004         }
2005         for (unitnum = 0;unitnum < backendunits;unitnum++)
2006         {
2007                 gltextureunit_t *unit = gl_state.units + unitnum;
2008                 // no texmatrix specified, revert to identity
2009                 if (unit->texmatrixenabled)
2010                 {
2011                         unit->texmatrixenabled = false;
2012                         CHECKGLERROR
2013                         qglMatrixMode(GL_TEXTURE);CHECKGLERROR
2014                         GL_ActiveTexture(unitnum);
2015                         qglLoadIdentity();CHECKGLERROR
2016                         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
2017                 }
2018                 if (gl_combine.integer)
2019                 {
2020                         // GL_ARB_texture_env_combine
2021                         if (unit->combinergb != GL_MODULATE)
2022                         {
2023                                 unit->combinergb = GL_MODULATE;
2024                                 GL_ActiveTexture(unitnum);
2025                                 qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, unit->combinergb);CHECKGLERROR
2026                         }
2027                         if (unit->combinealpha != GL_MODULATE)
2028                         {
2029                                 unit->combinealpha = GL_MODULATE;
2030                                 GL_ActiveTexture(unitnum);
2031                                 qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, unit->combinealpha);CHECKGLERROR
2032                         }
2033                         if (unit->rgbscale != 1)
2034                         {
2035                                 GL_ActiveTexture(unitnum);
2036                                 qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, (unit->rgbscale = 1));CHECKGLERROR
2037                         }
2038                         if (unit->alphascale != 1)
2039                         {
2040                                 GL_ActiveTexture(unitnum);
2041                                 qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, (unit->alphascale = 1));CHECKGLERROR
2042                         }
2043                 }
2044                 else
2045                 {
2046                         // normal GL texenv
2047                         if (unit->combinergb != GL_MODULATE)
2048                         {
2049                                 unit->combinergb = GL_MODULATE;
2050                                 GL_ActiveTexture(unitnum);
2051                                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, unit->combinergb);CHECKGLERROR
2052                         }
2053                 }
2054         }
2055 }
2056
2057 void R_Mesh_Draw_ShowTris(int firstvertex, int numvertices, int numtriangles, const int *elements)
2058 {
2059         CHECKGLERROR
2060         qglBegin(GL_LINES);
2061         for (;numtriangles;numtriangles--, elements += 3)
2062         {
2063                 qglArrayElement(elements[0]);qglArrayElement(elements[1]);
2064                 qglArrayElement(elements[1]);qglArrayElement(elements[2]);
2065                 qglArrayElement(elements[2]);qglArrayElement(elements[0]);
2066         }
2067         qglEnd();
2068         CHECKGLERROR
2069 }