gl_backend.c

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