gl_backend.c

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