gl_backend.c

   1
   2 #include "quakedef.h"
   3 #include "image.h"
   4
   5 cvar_t gl_mesh_maxverts = {0, "gl_mesh_maxverts", "21760"};
   6 cvar_t gl_mesh_floatcolors = {0, "gl_mesh_floatcolors", "1"};
   7 cvar_t gl_mesh_drawrangeelements = {0, "gl_mesh_drawrangeelements", "1"};
   8 cvar_t gl_mesh_vertex_array_range = {0, "gl_mesh_vertex_array_range", "0"};
   9 cvar_t gl_mesh_vertex_array_range_readfrequency = {0, "gl_mesh_vertex_array_range_readfrequency", "0.2"};
  10 cvar_t gl_mesh_vertex_array_range_writefrequency = {0, "gl_mesh_vertex_array_range_writefrequency", "0.2"};
  11 cvar_t gl_mesh_vertex_array_range_priority = {0, "gl_mesh_vertex_array_range_priority", "0.7"};
  12 cvar_t gl_delayfinish = {CVAR_SAVE, "gl_delayfinish", "0"};
  13
  14 cvar_t r_render = {0, "r_render", "1"};
  15 cvar_t gl_dither = {CVAR_SAVE, "gl_dither", "1"}; // whether or not to use dithering
  16 cvar_t gl_lockarrays = {0, "gl_lockarrays", "1"};
  17
  18 int gl_maxdrawrangeelementsvertices;
  19 int gl_maxdrawrangeelementsindices;
  20
  21 #ifdef DEBUGGL
  22 int errornumber = 0;
  23
  24 void GL_PrintError(int errornumber, char *filename, int linenumber)
  25 {
  26         switch(errornumber)
  27         {
  28 #ifdef GL_INVALID_ENUM
  29         case GL_INVALID_ENUM:
  30                 Con_Printf("GL_INVALID_ENUM at %s:%i\n", filename, linenumber);
  31                 break;
  32 #endif
  33 #ifdef GL_INVALID_VALUE
  34         case GL_INVALID_VALUE:
  35                 Con_Printf("GL_INVALID_VALUE at %s:%i\n", filename, linenumber);
  36                 break;
  37 #endif
  38 #ifdef GL_INVALID_OPERATION
  39         case GL_INVALID_OPERATION:
  40                 Con_Printf("GL_INVALID_OPERATION at %s:%i\n", filename, linenumber);
  41                 break;
  42 #endif
  43 #ifdef GL_STACK_OVERFLOW
  44         case GL_STACK_OVERFLOW:
  45                 Con_Printf("GL_STACK_OVERFLOW at %s:%i\n", filename, linenumber);
  46                 break;
  47 #endif
  48 #ifdef GL_STACK_UNDERFLOW
  49         case GL_STACK_UNDERFLOW:
  50                 Con_Printf("GL_STACK_UNDERFLOW at %s:%i\n", filename, linenumber);
  51                 break;
  52 #endif
  53 #ifdef GL_OUT_OF_MEMORY
  54         case GL_OUT_OF_MEMORY:
  55                 Con_Printf("GL_OUT_OF_MEMORY at %s:%i\n", filename, linenumber);
  56                 break;
  57 #endif
  58 #ifdef GL_TABLE_TOO_LARGE
  59         case GL_TABLE_TOO_LARGE:
  60                 Con_Printf("GL_TABLE_TOO_LARGE at %s:%i\n", filename, linenumber);
  61                 break;
  62 #endif
  63         default:
  64                 Con_Printf("GL UNKNOWN (%i) at %s:%i\n", errornumber, filename, linenumber);
  65                 break;
  66         }
  67 }
  68 #endif
  69
  70 #define BACKENDACTIVECHECK if (!backendactive) Sys_Error("GL backend function called when backend is not active\n");
  71
  72 int c_meshs, c_meshelements;
  73
  74 void SCR_ScreenShot_f (void);
  75
  76 // these are externally accessible
  77 int r_lightmapscalebit;
  78 float r_colorscale;
  79 GLfloat *varray_vertex, *varray_buf_vertex;
  80 GLfloat *varray_color, *varray_buf_color;
  81 GLfloat *varray_texcoord[MAX_TEXTUREUNITS], *varray_buf_texcoord[MAX_TEXTUREUNITS];
  82 int mesh_maxverts;
  83 int mesh_var;
  84 float mesh_var_readfrequency;
  85 float mesh_var_writefrequency;
  86 float mesh_var_priority;
  87 int varray_offset = 0, varray_offsetnext = 0;
  88 GLuint *varray_buf_elements;
  89 int mesh_maxelements = 3072;
  90
  91 static matrix4x4_t backend_viewmatrix;
  92 static matrix4x4_t backend_modelmatrix;
  93 static matrix4x4_t backend_modelviewmatrix;
  94 static matrix4x4_t backend_glmodelviewmatrix;
  95 static matrix4x4_t backend_projectmatrix;
  96
  97 static int backendunits, backendactive;
  98 static GLubyte *varray_bcolor, *varray_buf_bcolor;
  99 static mempool_t *gl_backend_mempool;
 100
 101 /*
 102 note: here's strip order for a terrain row:
 103 0--1--2--3--4
 104 |\ |\ |\ |\ |
 105 | \| \| \| \|
 106 A--B--C--D--E
 107
 108 A0B, 01B, B1C, 12C, C2D, 23D, D3E, 34E
 109
 110 *elements++ = i + row;
 111 *elements++ = i;
 112 *elements++ = i + row + 1;
 113 *elements++ = i;
 114 *elements++ = i + 1;
 115 *elements++ = i + row + 1;
 116 */
 117
 118 void GL_Backend_AllocElementsArray(void)
 119 {
 120         if (varray_buf_elements)
 121                 Mem_Free(varray_buf_elements);
 122         varray_buf_elements = Mem_Alloc(gl_backend_mempool, mesh_maxelements * sizeof(GLuint));
 123 }
 124
 125 void GL_Backend_FreeElementArray(void)
 126 {
 127         if (varray_buf_elements)
 128                 Mem_Free(varray_buf_elements);
 129         varray_buf_elements = NULL;
 130 }
 131
 132 void GL_Backend_CheckCvars(void)
 133 {
 134         // 21760 is (65536 / 3) rounded off to a multiple of 128
 135         if (gl_mesh_maxverts.integer < 1024)
 136                 Cvar_SetValueQuick(&gl_mesh_maxverts, 1024);
 137         if (gl_mesh_maxverts.integer > 21760)
 138                 Cvar_SetValueQuick(&gl_mesh_maxverts, 21760);
 139         if (gl_mesh_vertex_array_range.integer && !gl_support_var)
 140                 Cvar_SetValueQuick(&gl_mesh_vertex_array_range, 0);
 141         if (gl_mesh_vertex_array_range_readfrequency.value < 0)
 142                 Cvar_SetValueQuick(&gl_mesh_vertex_array_range_readfrequency, 0);
 143         if (gl_mesh_vertex_array_range_readfrequency.value > 1)
 144                 Cvar_SetValueQuick(&gl_mesh_vertex_array_range_readfrequency, 1);
 145         if (gl_mesh_vertex_array_range_writefrequency.value < 0)
 146                 Cvar_SetValueQuick(&gl_mesh_vertex_array_range_writefrequency, 0);
 147         if (gl_mesh_vertex_array_range_writefrequency.value > 1)
 148                 Cvar_SetValueQuick(&gl_mesh_vertex_array_range_writefrequency, 1);
 149         if (gl_mesh_vertex_array_range_priority.value < 0)
 150                 Cvar_SetValueQuick(&gl_mesh_vertex_array_range_priority, 0);
 151         if (gl_mesh_vertex_array_range_priority.value > 1)
 152                 Cvar_SetValueQuick(&gl_mesh_vertex_array_range_priority, 1);
 153 }
 154
 155 int polygonelements[768];
 156
 157 void GL_Backend_AllocArrays(void)
 158 {
 159         int i, size;
 160
 161         if (!gl_backend_mempool)
 162         {
 163                 gl_backend_mempool = Mem_AllocPool("GL_Backend");
 164                 varray_buf_vertex = NULL;
 165                 varray_buf_color = NULL;
 166                 varray_buf_bcolor = NULL;
 167                 varray_buf_elements = NULL;
 168                 for (i = 0;i < MAX_TEXTUREUNITS;i++)
 169                         varray_buf_texcoord[i] = NULL;
 170         }
 171
 172         mesh_maxverts = gl_mesh_maxverts.integer;
 173         mesh_var = gl_mesh_vertex_array_range.integer;
 174         mesh_var_readfrequency = gl_mesh_vertex_array_range_readfrequency.value;
 175         mesh_var_writefrequency = gl_mesh_vertex_array_range_writefrequency.value;
 176         mesh_var_priority = gl_mesh_vertex_array_range_priority.value;
 177
 178         if (varray_buf_vertex)
 179                 VID_FreeVertexArrays(varray_buf_vertex);
 180         varray_buf_vertex = NULL;
 181         varray_buf_color = NULL;
 182         varray_buf_bcolor = NULL;
 183         for (i = 0;i < MAX_TEXTUREUNITS;i++)
 184                 varray_buf_texcoord[i] = NULL;
 185
 186         size = mesh_maxverts * (sizeof(GLfloat[4]) + sizeof(GLfloat[4]) + sizeof(GLfloat[4]) * backendunits + sizeof(GLubyte[4]));
 187         varray_buf_vertex = VID_AllocVertexArrays(gl_backend_mempool, size, gl_mesh_vertex_array_range.integer, gl_mesh_vertex_array_range_readfrequency.value, gl_mesh_vertex_array_range_writefrequency.value, gl_mesh_vertex_array_range_priority.value);
 188         varray_buf_color = varray_buf_vertex + 4 * mesh_maxverts;
 189         for (i = 0;i < backendunits;i++)
 190                 varray_buf_texcoord[i] = varray_buf_vertex + (i + 2) * 4 * mesh_maxverts;
 191         for (;i < MAX_TEXTUREUNITS;i++)
 192                 varray_buf_texcoord[i] = NULL;
 193         varray_buf_bcolor = (GLubyte *)(varray_buf_vertex + (backendunits + 2) * 4 * mesh_maxverts);
 194
 195         GL_Backend_AllocElementsArray();
 196
 197         if (gl_support_var)
 198         {
 199                 CHECKGLERROR
 200                 qglVertexArrayRangeNV(size, varray_buf_vertex);
 201                 CHECKGLERROR
 202                 qglEnableClientState(GL_VERTEX_ARRAY_RANGE_NV);
 203                 CHECKGLERROR
 204         }
 205 }
 206
 207 void GL_Backend_FreeArrays(void)
 208 {
 209         int i;
 210
 211         if (gl_support_var)
 212         {
 213                 CHECKGLERROR
 214                 qglDisableClientState(GL_VERTEX_ARRAY_RANGE_NV);
 215                 CHECKGLERROR
 216         }
 217
 218         if (varray_buf_vertex)
 219                 VID_FreeVertexArrays(varray_buf_vertex);
 220         varray_buf_vertex = NULL;
 221         varray_buf_color = NULL;
 222         varray_buf_bcolor = NULL;
 223         for (i = 0;i < MAX_TEXTUREUNITS;i++)
 224                 varray_buf_texcoord[i] = NULL;
 225
 226         Mem_FreePool(&gl_backend_mempool);
 227
 228         varray_buf_elements = NULL;
 229 }
 230
 231 static void gl_backend_start(void)
 232 {
 233         GL_Backend_CheckCvars();
 234
 235         Con_Printf("OpenGL Backend started with gl_mesh_maxverts %i\n", gl_mesh_maxverts.integer);
 236         if (qglDrawRangeElements != NULL)
 237         {
 238                 CHECKGLERROR
 239                 qglGetIntegerv(GL_MAX_ELEMENTS_VERTICES, &gl_maxdrawrangeelementsvertices);
 240                 CHECKGLERROR
 241                 qglGetIntegerv(GL_MAX_ELEMENTS_INDICES, &gl_maxdrawrangeelementsindices);
 242                 CHECKGLERROR
 243                 Con_Printf("glDrawRangeElements detected (max vertices %i, max indices %i)\n", gl_maxdrawrangeelementsvertices, gl_maxdrawrangeelementsindices);
 244         }
 245         if (strstr(gl_renderer, "3Dfx"))
 246         {
 247                 Con_Printf("3Dfx driver detected, forcing gl_mesh_floatcolors to 0 to prevent crashs\n");
 248                 Cvar_SetValueQuick(&gl_mesh_floatcolors, 0);
 249         }
 250
 251         backendunits = min(MAX_TEXTUREUNITS, gl_textureunits);
 252
 253         GL_Backend_AllocArrays();
 254
 255         backendactive = true;
 256 }
 257
 258 static void gl_backend_shutdown(void)
 259 {
 260         backendunits = 0;
 261         backendactive = false;
 262
 263         Con_Printf("OpenGL Backend shutting down\n");
 264
 265         GL_Backend_FreeArrays();
 266 }
 267
 268 void GL_Backend_ResizeArrays(int numvertices)
 269 {
 270         Cvar_SetValueQuick(&gl_mesh_maxverts, numvertices);
 271         GL_Backend_CheckCvars();
 272         mesh_maxverts = gl_mesh_maxverts.integer;
 273         GL_Backend_AllocArrays();
 274 }
 275
 276 static void gl_backend_newmap(void)
 277 {
 278 }
 279
 280 void gl_backend_init(void)
 281 {
 282         int i;
 283
 284         for (i = 0;i < POLYGONELEMENTS_MAXPOINTS - 2;i++)
 285         {
 286                 polygonelements[i * 3 + 0] = 0;
 287                 polygonelements[i * 3 + 1] = i + 1;
 288                 polygonelements[i * 3 + 2] = i + 2;
 289         }
 290
 291         Cvar_RegisterVariable(&r_render);
 292         Cvar_RegisterVariable(&gl_dither);
 293         Cvar_RegisterVariable(&gl_lockarrays);
 294         Cvar_RegisterVariable(&gl_delayfinish);
 295 #ifdef NORENDER
 296         Cvar_SetValue("r_render", 0);
 297 #endif
 298
 299         Cvar_RegisterVariable(&gl_mesh_maxverts);
 300         Cvar_RegisterVariable(&gl_mesh_floatcolors);
 301         Cvar_RegisterVariable(&gl_mesh_drawrangeelements);
 302         Cvar_RegisterVariable(&gl_mesh_vertex_array_range);
 303         Cvar_RegisterVariable(&gl_mesh_vertex_array_range_readfrequency);
 304         Cvar_RegisterVariable(&gl_mesh_vertex_array_range_writefrequency);
 305         Cvar_RegisterVariable(&gl_mesh_vertex_array_range_priority);
 306         R_RegisterModule("GL_Backend", gl_backend_start, gl_backend_shutdown, gl_backend_newmap);
 307 }
 308
 309 void GL_SetupView_ViewPort (int x, int y, int width, int height)
 310 {
 311         if (!r_render.integer)
 312                 return;
 313
 314         // y is weird beause OpenGL is bottom to top, we use top to bottom
 315         qglViewport(x, vid.realheight - (y + height), width, height);
 316         CHECKGLERROR
 317 }
 318
 319 void GL_SetupView_Orientation_Identity (void)
 320 {
 321         Matrix4x4_CreateIdentity(&backend_viewmatrix);
 322         memset(&backend_modelmatrix, 0, sizeof(backend_modelmatrix));
 323 }
 324
 325 void GL_SetupView_Orientation_FromEntity (vec3_t origin, vec3_t angles)
 326 {
 327         Matrix4x4_CreateRotate(&backend_viewmatrix, -90, 1, 0, 0);
 328         Matrix4x4_ConcatRotate(&backend_viewmatrix, 90, 0, 0, 1);
 329         Matrix4x4_ConcatRotate(&backend_viewmatrix, -angles[2], 1, 0, 0);
 330         Matrix4x4_ConcatRotate(&backend_viewmatrix, -angles[0], 0, 1, 0);
 331         Matrix4x4_ConcatRotate(&backend_viewmatrix, -angles[1], 0, 0, 1);
 332         Matrix4x4_ConcatTranslate(&backend_viewmatrix, -origin[0], -origin[1], -origin[2]);
 333         memset(&backend_modelmatrix, 0, sizeof(backend_modelmatrix));
 334 }
 335
 336 void GL_SetupView_Mode_Perspective (double fovx, double fovy, double zNear, double zFar)
 337 {
 338         double xmax, ymax;
 339
 340         if (!r_render.integer)
 341                 return;
 342
 343         // set up viewpoint
 344         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 345         qglLoadIdentity();CHECKGLERROR
 346         // pyramid slopes
 347         xmax = zNear * tan(fovx * M_PI / 360.0);
 348         ymax = zNear * tan(fovy * M_PI / 360.0);
 349         // set view pyramid
 350         qglFrustum(-xmax, xmax, -ymax, ymax, zNear, zFar);CHECKGLERROR
 351         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 352         GL_SetupView_Orientation_Identity();
 353 }
 354
 355 void GL_SetupView_Mode_PerspectiveInfiniteFarClip (double fovx, double fovy, double zNear)
 356 {
 357         float nudge, m[16];
 358
 359         if (!r_render.integer)
 360                 return;
 361
 362         // set up viewpoint
 363         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 364         qglLoadIdentity();CHECKGLERROR
 365         // set view pyramid
 366         nudge = 1.0 - 1.0 / (1<<23);
 367         m[ 0] = 1.0 / tan(fovx * M_PI / 360.0);
 368         m[ 1] = 0;
 369         m[ 2] = 0;
 370         m[ 3] = 0;
 371         m[ 4] = 0;
 372         m[ 5] = 1.0 / tan(fovy * M_PI / 360.0);
 373         m[ 6] = 0;
 374         m[ 7] = 0;
 375         m[ 8] = 0;
 376         m[ 9] = 0;
 377         m[10] = -1 * nudge;
 378         m[11] = -1 * nudge;
 379         m[12] = 0;
 380         m[13] = 0;
 381         m[14] = -2 * zNear * nudge;
 382         m[15] = 0;
 383         qglLoadMatrixf(m);
 384         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 385         GL_SetupView_Orientation_Identity();
 386         backend_projectmatrix.m[0][0] = m[0];
 387         backend_projectmatrix.m[1][0] = m[1];
 388         backend_projectmatrix.m[2][0] = m[2];
 389         backend_projectmatrix.m[3][0] = m[3];
 390         backend_projectmatrix.m[0][1] = m[4];
 391         backend_projectmatrix.m[1][1] = m[5];
 392         backend_projectmatrix.m[2][1] = m[6];
 393         backend_projectmatrix.m[3][1] = m[7];
 394         backend_projectmatrix.m[0][2] = m[8];
 395         backend_projectmatrix.m[1][2] = m[9];
 396         backend_projectmatrix.m[2][2] = m[10];
 397         backend_projectmatrix.m[3][2] = m[11];
 398         backend_projectmatrix.m[0][3] = m[12];
 399         backend_projectmatrix.m[1][3] = m[13];
 400         backend_projectmatrix.m[2][3] = m[14];
 401         backend_projectmatrix.m[3][3] = m[15];
 402 }
 403
 404 void GL_SetupView_Mode_Ortho (double x1, double y1, double x2, double y2, double zNear, double zFar)
 405 {
 406         if (!r_render.integer)
 407                 return;
 408
 409         // set up viewpoint
 410         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 411         qglLoadIdentity();CHECKGLERROR
 412         qglOrtho(x1, x2, y2, y1, zNear, zFar);
 413         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 414         GL_SetupView_Orientation_Identity();
 415 }
 416
 417 typedef struct gltextureunit_s
 418 {
 419         int t1d, t2d, t3d, tcubemap;
 420         int arrayenabled;
 421         float rgbscale, alphascale;
 422         int combinergb, combinealpha;
 423         // FIXME: add more combine stuff
 424 }
 425 gltextureunit_t;
 426
 427 static struct
 428 {
 429         int blendfunc1;
 430         int blendfunc2;
 431         int blend;
 432         GLboolean depthmask;
 433         int depthdisable;
 434         int unit;
 435         int clientunit;
 436         gltextureunit_t units[MAX_TEXTUREUNITS];
 437         int colorarray;
 438 }
 439 gl_state;
 440
 441 void GL_SetupTextureState(void)
 442 {
 443         int i;
 444         gltextureunit_t *unit;
 445         for (i = 0;i < backendunits;i++)
 446         {
 447                 if (qglActiveTexture)
 448                         qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 449                 if (qglClientActiveTexture)
 450                         qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 451                 unit = gl_state.units + i;
 452                 unit->t1d = 0;
 453                 unit->t2d = 0;
 454                 unit->t3d = 0;
 455                 unit->tcubemap = 0;
 456                 unit->rgbscale = 1;
 457                 unit->alphascale = 1;
 458                 unit->combinergb = GL_MODULATE;
 459                 unit->combinealpha = GL_MODULATE;
 460                 unit->arrayenabled = false;
 461                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 462                 if (gl_texture3d || gl_texturecubemap)
 463                 {
 464                         qglTexCoordPointer(3, GL_FLOAT, sizeof(float[4]), varray_buf_texcoord[i]);CHECKGLERROR
 465                 }
 466                 else
 467                 {
 468                         qglTexCoordPointer(2, GL_FLOAT, sizeof(float[4]), varray_buf_texcoord[i]);CHECKGLERROR
 469                 }
 470                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 471                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 472                 if (gl_texture3d)
 473                 {
 474                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 475                 }
 476                 if (gl_texturecubemap)
 477                 {
 478                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 479                 }
 480                 if (gl_combine.integer)
 481                 {
 482                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);CHECKGLERROR
 483                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_MODULATE);CHECKGLERROR
 484                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE);CHECKGLERROR
 485                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 486                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_RGB_ARB, GL_CONSTANT_ARB);CHECKGLERROR
 487                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 488                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 489                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_RGB_ARB, GL_SRC_ALPHA);CHECKGLERROR
 490                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, GL_MODULATE);CHECKGLERROR
 491                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA_ARB, GL_TEXTURE);CHECKGLERROR
 492                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_ALPHA_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 493                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_ALPHA_ARB, GL_CONSTANT_ARB);CHECKGLERROR
 494                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 495                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 496                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 497                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
 498                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
 499                 }
 500                 else
 501                 {
 502                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 503                 }
 504         }
 505 }
 506
 507 void GL_Backend_ResetState(void)
 508 {
 509         memset(&gl_state, 0, sizeof(gl_state));
 510         gl_state.depthdisable = false;
 511         gl_state.blendfunc1 = GL_ONE;
 512         gl_state.blendfunc2 = GL_ZERO;
 513         gl_state.blend = false;
 514         gl_state.depthmask = GL_TRUE;
 515         gl_state.colorarray = false;
 516
 517         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 518         qglDisableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 519
 520         qglEnable(GL_CULL_FACE);CHECKGLERROR
 521         qglCullFace(GL_FRONT);CHECKGLERROR
 522         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 523         qglBlendFunc(gl_state.blendfunc1, gl_state.blendfunc2);CHECKGLERROR
 524         qglDisable(GL_BLEND);CHECKGLERROR
 525         qglDepthMask(gl_state.depthmask);CHECKGLERROR
 526         qglVertexPointer(3, GL_FLOAT, sizeof(GLfloat[4]), varray_buf_vertex);CHECKGLERROR
 527         qglEnableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 528         if (gl_mesh_floatcolors.integer)
 529         {
 530                 qglColorPointer(4, GL_FLOAT, sizeof(GLfloat[4]), varray_buf_color);CHECKGLERROR
 531         }
 532         else
 533         {
 534                 qglColorPointer(4, GL_UNSIGNED_BYTE, sizeof(GLubyte[4]), varray_buf_bcolor);CHECKGLERROR
 535         }
 536         GL_Color(1, 1, 1, 1);
 537
 538         GL_SetupTextureState();
 539 }
 540
 541 void GL_UseColorArray(void)
 542 {
 543         if (!gl_state.colorarray)
 544         {
 545                 gl_state.colorarray = true;
 546                 qglEnableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 547         }
 548 }
 549
 550 void GL_Color(float cr, float cg, float cb, float ca)
 551 {
 552         if (gl_state.colorarray)
 553         {
 554                 gl_state.colorarray = false;
 555                 qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 556         }
 557         qglColor4f(cr, cg, cb, ca);
 558 }
 559
 560 void GL_TransformToScreen(const vec4_t in, vec4_t out)
 561 {
 562         vec4_t temp;
 563         float iw;
 564         Matrix4x4_Transform4 (&backend_viewmatrix, in, temp);
 565         Matrix4x4_Transform4 (&backend_projectmatrix, temp, out);
 566         iw = 1.0f / out[3];
 567         out[0] = r_refdef.x + (out[0] * iw + 1.0f) * r_refdef.width * 0.5f;
 568         out[1] = r_refdef.y + (out[1] * iw + 1.0f) * r_refdef.height * 0.5f;
 569         out[2] = out[2] * iw;
 570 }
 571
 572 // called at beginning of frame
 573 void R_Mesh_Start(void)
 574 {
 575         BACKENDACTIVECHECK
 576
 577         CHECKGLERROR
 578
 579         GL_Backend_CheckCvars();
 580         if (mesh_maxverts != gl_mesh_maxverts.integer
 581          || mesh_var != gl_mesh_vertex_array_range.integer
 582          || mesh_var_readfrequency != gl_mesh_vertex_array_range_readfrequency.value
 583          || mesh_var_writefrequency != gl_mesh_vertex_array_range_writefrequency.value
 584          || mesh_var_priority != gl_mesh_vertex_array_range_priority.value)
 585                 GL_Backend_ResizeArrays(gl_mesh_maxverts.integer);
 586
 587         GL_Backend_ResetState();
 588
 589         if (mesh_var)
 590         {
 591                 CHECKGLERROR
 592                 qglFlushVertexArrayRangeNV();
 593                 CHECKGLERROR
 594         }
 595         varray_offset = 0;
 596 }
 597
 598 int gl_backend_rebindtextures;
 599
 600 void GL_ConvertColorsFloatToByte(int numverts)
 601 {
 602         int i, k, total;
 603         // LordHavoc: to avoid problems with aliasing (treating memory as two
 604         // different types - exactly what this is doing), these must be volatile
 605         // (or a union)
 606         volatile int *icolor;
 607         volatile float *fcolor;
 608         GLubyte *bcolor;
 609
 610         total = numverts * 4;
 611
 612         // shift float to have 8bit fraction at base of number
 613         fcolor = varray_buf_color;
 614         for (i = 0;i < total;)
 615         {
 616                 fcolor[i    ] += 32768.0f;
 617                 fcolor[i + 1] += 32768.0f;
 618                 fcolor[i + 2] += 32768.0f;
 619                 fcolor[i + 3] += 32768.0f;
 620                 i += 4;
 621         }
 622
 623         // then read as integer and kill float bits...
 624         icolor = (int *)varray_buf_color;
 625         bcolor = varray_buf_bcolor;
 626         for (i = 0;i < total;)
 627         {
 628                 k = icolor[i    ] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i    ] = (GLubyte) k;
 629                 k = icolor[i + 1] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i + 1] = (GLubyte) k;
 630                 k = icolor[i + 2] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i + 2] = (GLubyte) k;
 631                 k = icolor[i + 3] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i + 3] = (GLubyte) k;
 632                 i += 4;
 633         }
 634 }
 635
 636 /*
 637 // enlarges geometry buffers if they are too small
 638 void _R_Mesh_ResizeCheck(int numverts)
 639 {
 640         if (numverts > mesh_maxverts)
 641         {
 642                 BACKENDACTIVECHECK
 643                 GL_Backend_ResizeArrays(numverts + 100);
 644                 GL_Backend_ResetState();
 645         }
 646 }
 647 */
 648
 649 void GL_Backend_RenumberElements(int numelements, const int *in, int offset)
 650 {
 651         int i;
 652         for (i = 0;i < numelements;i++)
 653                 varray_buf_elements[i] = in[i] + offset;
 654 }
 655
 656 // gets geometry space for a mesh
 657 void R_Mesh_GetSpace(int numverts)
 658 {
 659         int i;
 660
 661         varray_offset = varray_offsetnext;
 662         if (varray_offset + numverts > mesh_maxverts)
 663                 varray_offset = 0;
 664         if (numverts > mesh_maxverts)
 665         {
 666                 BACKENDACTIVECHECK
 667                 GL_Backend_ResizeArrays(numverts + 100);
 668                 GL_Backend_ResetState();
 669                 varray_offset = 0;
 670         }
 671
 672         if (varray_offset == 0 && mesh_var)
 673         {
 674                 CHECKGLERROR
 675                 qglFlushVertexArrayRangeNV();
 676                 CHECKGLERROR
 677         }
 678
 679         // for debugging
 680         //if (!mesh_var)
 681         //      varray_offset = rand() % (mesh_maxverts - numverts);
 682
 683         varray_vertex = varray_buf_vertex + varray_offset * 4;
 684         varray_color = varray_buf_color + varray_offset * 4;
 685         varray_bcolor = varray_buf_bcolor + varray_offset * 4;
 686         for (i = 0;i < backendunits;i++)
 687                 varray_texcoord[i] = varray_buf_texcoord[i] + varray_offset * 4;
 688
 689         varray_offsetnext = varray_offset + numverts;
 690 }
 691
 692 // renders the current mesh
 693 void R_Mesh_Draw(int numverts, int numtriangles, const int *elements)
 694 {
 695         int numelements;
 696         if (numtriangles == 0 || numverts == 0)
 697         {
 698                 Con_Printf("R_Mesh_Draw(%d, %d, %08p);\n", numverts, numtriangles, elements);
 699                 return;
 700         }
 701         numelements = numtriangles * 3;
 702         if (mesh_maxelements < numelements)
 703         {
 704                 mesh_maxelements = numelements;
 705                 GL_Backend_AllocElementsArray();
 706         }
 707         GL_Backend_RenumberElements(numelements, elements, varray_offset);
 708         c_meshs++;
 709         c_meshelements += numelements;
 710         if (gl_state.colorarray && !gl_mesh_floatcolors.integer)
 711                 GL_ConvertColorsFloatToByte(numverts);
 712         if (r_render.integer)
 713         {
 714                 if (gl_supportslockarrays && gl_lockarrays.integer)
 715                 {
 716                         qglLockArraysEXT(varray_offset, numverts);
 717                         CHECKGLERROR
 718                         if (gl_mesh_drawrangeelements.integer && qglDrawRangeElements != NULL)
 719                         {
 720                                 qglDrawRangeElements(GL_TRIANGLES, varray_offset, varray_offset + numverts, numelements, GL_UNSIGNED_INT, (const GLuint *) varray_buf_elements);
 721                                 CHECKGLERROR
 722                         }
 723                         else
 724                         {
 725                                 qglDrawElements(GL_TRIANGLES, numelements, GL_UNSIGNED_INT, (const GLuint *) varray_buf_elements);
 726                                 CHECKGLERROR
 727                         }
 728                         qglUnlockArraysEXT();
 729                         CHECKGLERROR
 730                 }
 731                 else
 732                 {
 733                         qglDrawElements(GL_TRIANGLES, numelements, GL_UNSIGNED_INT, (const GLuint *) varray_buf_elements);
 734                         CHECKGLERROR
 735                 }
 736         }
 737 }
 738
 739 // restores backend state, used when done with 3D rendering
 740 void R_Mesh_Finish(void)
 741 {
 742         int i;
 743         BACKENDACTIVECHECK
 744         if (mesh_var)
 745         {
 746                 CHECKGLERROR
 747                 qglFlushVertexArrayRangeNV();
 748                 CHECKGLERROR
 749         }
 750         varray_offset = 0;
 751
 752         for (i = backendunits - 1;i >= 0;i--)
 753         {
 754                 if (qglActiveTexture)
 755                         qglActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
 756                 if (qglClientActiveTexture)
 757                         qglClientActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
 758                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 759                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 760                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 761                 if (gl_texture3d)
 762                 {
 763                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 764                 }
 765                 if (gl_texturecubemap)
 766                 {
 767                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 768                 }
 769                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 770                 if (gl_combine.integer)
 771                 {
 772                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
 773                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
 774                 }
 775         }
 776         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 777         qglDisableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 778
 779         qglDisable(GL_BLEND);CHECKGLERROR
 780         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 781         qglDepthMask(GL_TRUE);CHECKGLERROR
 782         qglBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);CHECKGLERROR
 783 }
 784
 785 void R_Mesh_Matrix(const matrix4x4_t *matrix)
 786 {
 787         if (memcmp(matrix, &backend_modelmatrix, sizeof(matrix4x4_t)))
 788         {
 789                 backend_modelmatrix = *matrix;
 790                 Matrix4x4_Concat(&backend_modelviewmatrix, &backend_viewmatrix, matrix);
 791                 Matrix4x4_Transpose(&backend_glmodelviewmatrix, &backend_modelviewmatrix);
 792                 qglLoadMatrixf(&backend_glmodelviewmatrix.m[0][0]);
 793         }
 794 }
 795
 796 // sets up the requested state
 797 void R_Mesh_MainState(const rmeshstate_t *m)
 798 {
 799         BACKENDACTIVECHECK
 800
 801         if (gl_state.blendfunc1 != m->blendfunc1 || gl_state.blendfunc2 != m->blendfunc2)
 802         {
 803                 qglBlendFunc(gl_state.blendfunc1 = m->blendfunc1, gl_state.blendfunc2 = m->blendfunc2);CHECKGLERROR
 804                 if (gl_state.blendfunc2 == GL_ZERO)
 805                 {
 806                         if (gl_state.blendfunc1 == GL_ONE)
 807                         {
 808                                 if (gl_state.blend)
 809                                 {
 810                                         gl_state.blend = 0;
 811                                         qglDisable(GL_BLEND);CHECKGLERROR
 812                                 }
 813                         }
 814                         else
 815                         {
 816                                 if (!gl_state.blend)
 817                                 {
 818                                         gl_state.blend = 1;
 819                                         qglEnable(GL_BLEND);CHECKGLERROR
 820                                 }
 821                         }
 822                 }
 823                 else
 824                 {
 825                         if (!gl_state.blend)
 826                         {
 827                                 gl_state.blend = 1;
 828                                 qglEnable(GL_BLEND);CHECKGLERROR
 829                         }
 830                 }
 831         }
 832         if (gl_state.depthdisable != m->depthdisable)
 833         {
 834                 gl_state.depthdisable = m->depthdisable;
 835                 if (gl_state.depthdisable)
 836                         qglDisable(GL_DEPTH_TEST);
 837                 else
 838                         qglEnable(GL_DEPTH_TEST);
 839         }
 840         if (gl_state.depthmask != (m->blendfunc2 == GL_ZERO || m->depthwrite))
 841         {
 842                 qglDepthMask(gl_state.depthmask = (m->blendfunc2 == GL_ZERO || m->depthwrite));CHECKGLERROR
 843         }
 844 }
 845
 846 void R_Mesh_TextureState(const rmeshstate_t *m)
 847 {
 848         int i, combinergb, combinealpha;
 849         float scale;
 850         gltextureunit_t *unit;
 851
 852         BACKENDACTIVECHECK
 853
 854         if (gl_backend_rebindtextures)
 855         {
 856                 gl_backend_rebindtextures = false;
 857                 GL_SetupTextureState();
 858         }
 859
 860         for (i = 0;i < backendunits;i++)
 861         {
 862                 unit = gl_state.units + i;
 863                 if (unit->t1d != m->tex1d[i] || unit->t2d != m->tex[i] || unit->t3d != m->tex3d[i] || unit->tcubemap != m->texcubemap[i])
 864                 {
 865                         if (gl_state.unit != i)
 866                         {
 867                                 qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 868                         }
 869                         if (m->tex1d[i] || m->tex[i] || m->tex3d[i] || m->texcubemap[i])
 870                         {
 871                                 if (!unit->arrayenabled)
 872                                 {
 873                                         unit->arrayenabled = true;
 874                                         if (gl_state.clientunit != i)
 875                                         {
 876                                                 qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 877                                         }
 878                                         qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 879                                 }
 880                         }
 881                         else
 882                         {
 883                                 if (unit->arrayenabled)
 884                                 {
 885                                         unit->arrayenabled = false;
 886                                         if (gl_state.clientunit != i)
 887                                         {
 888                                                 qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 889                                         }
 890                                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 891                                 }
 892                         }
 893                         combinergb = m->texcombinergb[i];
 894                         combinealpha = m->texcombinealpha[i];
 895                         if (!combinergb)
 896                                 combinergb = GL_MODULATE;
 897                         if (!combinealpha)
 898                                 combinealpha = GL_MODULATE;
 899                         if (unit->combinergb != combinergb)
 900                         {
 901                                 unit->combinergb = combinergb;
 902                                 if (gl_combine.integer)
 903                                 {
 904                                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, unit->combinergb);CHECKGLERROR
 905                                 }
 906                                 else
 907                                 {
 908                                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, unit->combinergb);CHECKGLERROR
 909                                 }
 910                         }
 911                         if (unit->combinealpha != combinealpha)
 912                         {
 913                                 unit->combinealpha = combinealpha;
 914                                 if (gl_combine.integer)
 915                                 {
 916                                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, unit->combinealpha);CHECKGLERROR
 917                                 }
 918                         }
 919                         if (unit->t1d != m->tex1d[i])
 920                         {
 921                                 if (m->tex1d[i])
 922                                 {
 923                                         if (unit->t1d == 0)
 924                                                 qglEnable(GL_TEXTURE_1D);CHECKGLERROR
 925                                 }
 926                                 else
 927                                 {
 928                                         if (unit->t1d)
 929                                                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 930                                 }
 931                                 qglBindTexture(GL_TEXTURE_1D, (unit->t1d = m->tex1d[i]));CHECKGLERROR
 932                         }
 933                         if (unit->t2d != m->tex[i])
 934                         {
 935                                 if (m->tex[i])
 936                                 {
 937                                         if (unit->t2d == 0)
 938                                                 qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 939                                 }
 940                                 else
 941                                 {
 942                                         if (unit->t2d)
 943                                                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 944                                 }
 945                                 qglBindTexture(GL_TEXTURE_2D, (unit->t2d = m->tex[i]));CHECKGLERROR
 946                         }
 947                         if (unit->t3d != m->tex3d[i])
 948                         {
 949                                 if (m->tex3d[i])
 950                                 {
 951                                         if (unit->t3d == 0)
 952                                                 qglEnable(GL_TEXTURE_3D);CHECKGLERROR
 953                                 }
 954                                 else
 955                                 {
 956                                         if (unit->t3d)
 957                                                 qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 958                                 }
 959                                 qglBindTexture(GL_TEXTURE_3D, (unit->t3d = m->tex3d[i]));CHECKGLERROR
 960                         }
 961                         if (unit->tcubemap != m->texcubemap[i])
 962                         {
 963                                 if (m->texcubemap[i])
 964                                 {
 965                                         if (unit->tcubemap == 0)
 966                                                 qglEnable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 967                                 }
 968                                 else
 969                                 {
 970                                         if (unit->tcubemap)
 971                                                 qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 972                                 }
 973                                 qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, (unit->tcubemap = m->texcubemap[i]));CHECKGLERROR
 974                         }
 975                 }
 976                 scale = max(m->texrgbscale[i], 1);
 977                 if (gl_state.units[i].rgbscale != scale)
 978                 {
 979                         if (gl_state.unit != i)
 980                         {
 981                                 qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 982                         }
 983                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, (gl_state.units[i].rgbscale = scale));CHECKGLERROR
 984                 }
 985                 scale = max(m->texalphascale[i], 1);
 986                 if (gl_state.units[i].alphascale != scale)
 987                 {
 988                         if (gl_state.unit != i)
 989                         {
 990                                 qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 991                         }
 992                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, (gl_state.units[i].alphascale = scale));CHECKGLERROR
 993                 }
 994         }
 995 }
 996
 997 void R_Mesh_State(const rmeshstate_t *m)
 998 {
 999         R_Mesh_MainState(m);
1000         R_Mesh_TextureState(m);
1001 }
1002
1003 /*
1004 ==============================================================================
1005
1006                                                 SCREEN SHOTS
1007
1008 ==============================================================================
1009 */
1010
1011 qboolean SCR_ScreenShot(char *filename, int x, int y, int width, int height)
1012 {
1013         qboolean ret;
1014         int i, j;
1015         qbyte *buffer;
1016
1017         if (!r_render.integer)
1018                 return false;
1019
1020         buffer = Mem_Alloc(tempmempool, width*height*3);
1021         qglReadPixels (x, y, width, height, GL_RGB, GL_UNSIGNED_BYTE, buffer);
1022         CHECKGLERROR
1023
1024         // LordHavoc: compensate for v_overbrightbits when using hardware gamma
1025         if (v_hwgamma.integer)
1026         {
1027                 for (i = 0;i < width * height * 3;i++)
1028                 {
1029                         j = buffer[i] << v_overbrightbits.integer;
1030                         buffer[i] = (qbyte) (bound(0, j, 255));
1031                 }
1032         }
1033
1034         ret = Image_WriteTGARGB_preflipped(filename, width, height, buffer);
1035
1036         Mem_Free(buffer);
1037         return ret;
1038 }
1039
1040 //=============================================================================
1041
1042 void R_ClearScreen(void)
1043 {
1044         if (r_render.integer)
1045         {
1046                 // clear to black
1047                 qglClearColor(0,0,0,0);CHECKGLERROR
1048                 qglClearDepth(1);CHECKGLERROR
1049                 if (gl_stencil)
1050                 {
1051                         // LordHavoc: we use a stencil centered around 128 instead of 0,
1052                         // to avoid clamping interfering with strange shadow volume
1053                         // drawing orders
1054                         qglClearStencil(128);CHECKGLERROR
1055                 }
1056                 // clear the screen
1057                 qglClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | (gl_stencil ? GL_STENCIL_BUFFER_BIT : 0));CHECKGLERROR
1058                 // set dithering mode
1059                 if (gl_dither.integer)
1060                 {
1061                         qglEnable(GL_DITHER);CHECKGLERROR
1062                 }
1063                 else
1064                 {
1065                         qglDisable(GL_DITHER);CHECKGLERROR
1066                 }
1067         }
1068 }
1069
1070 /*
1071 ==================
1072 SCR_UpdateScreen
1073
1074 This is called every frame, and can also be called explicitly to flush
1075 text to the screen.
1076 ==================
1077 */
1078 void SCR_UpdateScreen (void)
1079 {
1080         if (gl_delayfinish.integer)
1081         {
1082                 VID_Finish ();
1083
1084                 R_TimeReport("finish");
1085         }
1086
1087         if (r_textureunits.integer > gl_textureunits)
1088                 Cvar_SetValueQuick(&r_textureunits, gl_textureunits);
1089         if (r_textureunits.integer < 1)
1090                 Cvar_SetValueQuick(&r_textureunits, 1);
1091
1092         if (gl_combine.integer && (!gl_combine_extension || r_textureunits.integer < 2))
1093                 Cvar_SetValueQuick(&gl_combine, 0);
1094
1095         // lighting scale
1096         r_colorscale = 1.0f / (float) (1 << v_overbrightbits.integer);
1097
1098         // lightmaps only
1099         r_lightmapscalebit = v_overbrightbits.integer;
1100         if (gl_combine.integer && r_textureunits.integer > 1)
1101                 r_lightmapscalebit += 2;
1102
1103         R_TimeReport("setup");
1104
1105         R_ClearScreen();
1106
1107         R_TimeReport("clear");
1108
1109         if (scr_conlines < vid.conheight && cls.signon == SIGNONS)
1110                 R_RenderView();
1111
1112         // draw 2D stuff
1113         R_DrawQueue();
1114
1115         if (gl_delayfinish.integer)
1116         {
1117                 // tell driver to commit it's partially full geometry queue to the rendering queue
1118                 // (this doesn't wait for the commands themselves to complete)
1119                 qglFlush();
1120         }
1121         else
1122         {
1123                 VID_Finish ();
1124
1125                 R_TimeReport("finish");
1126         }
1127 }
1128