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                         qglTexCoordPointer(3, GL_FLOAT, sizeof(float[4]), varray_texcoord[i]);CHECKGLERROR
 299                 else
 300                         qglTexCoordPointer(2, GL_FLOAT, sizeof(float[4]), varray_texcoord[i]);CHECKGLERROR
 301                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 302                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 303                 if (gl_texture3d)
 304                 {
 305                         qglDisable(GL_TEXTURE_3D_EXT);CHECKGLERROR
 306                 }
 307                 if (gl_texturecubemap)
 308                 {
 309                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 310                 }
 311                 if (gl_combine.integer)
 312                 {
 313                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);CHECKGLERROR
 314                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_MODULATE);CHECKGLERROR
 315                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE);CHECKGLERROR
 316                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 317                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_RGB_ARB, GL_CONSTANT_ARB);CHECKGLERROR
 318                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 319                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 320                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_RGB_ARB, GL_SRC_ALPHA);CHECKGLERROR
 321                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, GL_MODULATE);CHECKGLERROR
 322                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA_ARB, GL_TEXTURE);CHECKGLERROR
 323                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_ALPHA_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 324                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_ALPHA_ARB, GL_CONSTANT_ARB);CHECKGLERROR
 325                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 326                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 327                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 328                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
 329                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
 330                 }
 331                 else
 332                 {
 333                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 334                 }
 335         }
 336 }
 337
 338 void GL_Backend_ResetState(void)
 339 {
 340         memset(&gl_state, 0, sizeof(gl_state));
 341         gl_state.depthdisable = false;
 342         gl_state.blendfunc1 = GL_ONE;
 343         gl_state.blendfunc2 = GL_ZERO;
 344         gl_state.blend = false;
 345         gl_state.depthmask = GL_TRUE;
 346         gl_state.colorarray = false;
 347
 348         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 349         qglDisableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 350
 351         qglEnable(GL_CULL_FACE);CHECKGLERROR
 352         qglCullFace(GL_FRONT);CHECKGLERROR
 353         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 354         qglBlendFunc(gl_state.blendfunc1, gl_state.blendfunc2);CHECKGLERROR
 355         qglDisable(GL_BLEND);CHECKGLERROR
 356         qglDepthMask(gl_state.depthmask);CHECKGLERROR
 357         qglVertexPointer(3, GL_FLOAT, sizeof(float[4]), varray_vertex);CHECKGLERROR
 358         qglEnableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 359         if (gl_mesh_floatcolors.integer)
 360         {
 361                 qglColorPointer(4, GL_FLOAT, sizeof(float[4]), varray_color);CHECKGLERROR
 362         }
 363         else
 364         {
 365                 qglColorPointer(4, GL_UNSIGNED_BYTE, sizeof(qbyte[4]), varray_bcolor);CHECKGLERROR
 366         }
 367         GL_Color(1, 1, 1, 1);
 368
 369         GL_SetupTextureState();
 370 }
 371
 372 void GL_UseColorArray(void)
 373 {
 374         if (!gl_state.colorarray)
 375         {
 376                 gl_state.colorarray = true;
 377                 qglEnableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 378         }
 379 }
 380
 381 void GL_Color(float cr, float cg, float cb, float ca)
 382 {
 383         if (gl_state.colorarray)
 384         {
 385                 gl_state.colorarray = false;
 386                 qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 387         }
 388         qglColor4f(cr, cg, cb, ca);
 389 }
 390
 391 // called at beginning of frame
 392 void R_Mesh_Start(void)
 393 {
 394         BACKENDACTIVECHECK
 395
 396         CHECKGLERROR
 397
 398         GL_Backend_CheckCvars();
 399         if (mesh_maxverts != gl_mesh_maxverts.integer)
 400                 GL_Backend_ResizeArrays(gl_mesh_maxverts.integer);
 401
 402         GL_Backend_ResetState();
 403 }
 404
 405 int gl_backend_rebindtextures;
 406
 407 void GL_ConvertColorsFloatToByte(int numverts)
 408 {
 409         int i, k, total;
 410         // LordHavoc: to avoid problems with aliasing (treating memory as two
 411         // different types - exactly what this is doing), these must be volatile
 412         // (or a union)
 413         volatile int *icolor;
 414         volatile float *fcolor;
 415         qbyte *bcolor;
 416
 417         total = numverts * 4;
 418
 419         // shift float to have 8bit fraction at base of number
 420         fcolor = varray_color;
 421         for (i = 0;i < total;)
 422         {
 423                 fcolor[i    ] += 32768.0f;
 424                 fcolor[i + 1] += 32768.0f;
 425                 fcolor[i + 2] += 32768.0f;
 426                 fcolor[i + 3] += 32768.0f;
 427                 i += 4;
 428         }
 429
 430         // then read as integer and kill float bits...
 431         icolor = (int *)varray_color;
 432         bcolor = varray_bcolor;
 433         for (i = 0;i < total;)
 434         {
 435                 k = icolor[i    ] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i    ] = (qbyte) k;
 436                 k = icolor[i + 1] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i + 1] = (qbyte) k;
 437                 k = icolor[i + 2] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i + 2] = (qbyte) k;
 438                 k = icolor[i + 3] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i + 3] = (qbyte) k;
 439                 i += 4;
 440         }
 441 }
 442
 443 void GL_DrawRangeElements(int firstvert, int endvert, int indexcount, int *index)
 444 {
 445         int arraylocked = false;
 446         c_meshs++;
 447         c_meshelements += indexcount;
 448         if (gl_supportslockarrays && gl_lockarrays.integer)
 449         {
 450                 qglLockArraysEXT(firstvert, endvert - firstvert);
 451                 CHECKGLERROR
 452                 arraylocked = true;
 453         }
 454         if (gl_mesh_drawrangeelements.integer && qglDrawRangeElements != NULL)
 455                 qglDrawRangeElements(GL_TRIANGLES, firstvert, endvert, indexcount, GL_UNSIGNED_INT, (GLuint *) index);
 456         else
 457                 qglDrawElements(GL_TRIANGLES, indexcount, GL_UNSIGNED_INT, (GLuint *) index);
 458         CHECKGLERROR
 459         if (arraylocked)
 460         {
 461                 qglUnlockArraysEXT();
 462                 CHECKGLERROR
 463                 arraylocked = false;
 464         }
 465 }
 466
 467 // enlarges geometry buffers if they are too small
 468 void _R_Mesh_ResizeCheck(int numverts)
 469 {
 470         if (numverts > mesh_maxverts)
 471         {
 472                 BACKENDACTIVECHECK
 473                 GL_Backend_ResizeArrays(numverts + 100);
 474                 GL_Backend_ResetState();
 475         }
 476 }
 477
 478 // renders the mesh
 479 void R_Mesh_Draw(int numverts, int numtriangles, int *elements)
 480 {
 481         BACKENDACTIVECHECK
 482
 483         CHECKGLERROR
 484
 485         if (gl_state.colorarray && !gl_mesh_floatcolors.integer)
 486                 GL_ConvertColorsFloatToByte(numverts);
 487         if (!r_render.integer)
 488                 return;
 489         GL_DrawRangeElements(0, numverts, numtriangles * 3, elements);
 490 }
 491
 492 // restores backend state, used when done with 3D rendering
 493 void R_Mesh_Finish(void)
 494 {
 495         int i;
 496         BACKENDACTIVECHECK
 497
 498         for (i = backendunits - 1;i >= 0;i--)
 499         {
 500                 if (qglActiveTexture)
 501                         qglActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
 502                 if (qglClientActiveTexture)
 503                         qglClientActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
 504                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 505                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 506                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 507                 if (gl_texture3d)
 508                 {
 509                         qglDisable(GL_TEXTURE_3D_EXT);CHECKGLERROR
 510                 }
 511                 if (gl_texturecubemap)
 512                 {
 513                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 514                 }
 515                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 516                 if (gl_combine.integer)
 517                 {
 518                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
 519                 }
 520         }
 521         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 522         qglDisableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 523
 524         qglDisable(GL_BLEND);CHECKGLERROR
 525         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 526         qglDepthMask(GL_TRUE);CHECKGLERROR
 527         qglBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);CHECKGLERROR
 528 }
 529
 530 void R_Mesh_Matrix(const matrix4x4_t *matrix)
 531 {
 532         if (memcmp(matrix, &backend_modelmatrix, sizeof(matrix4x4_t)))
 533         {
 534                 backend_modelmatrix = *matrix;
 535                 Matrix4x4_Concat(&backend_modelviewmatrix, &backend_viewmatrix, matrix);
 536                 Matrix4x4_Transpose(&backend_glmodelviewmatrix, &backend_modelviewmatrix);
 537                 qglLoadMatrixf(&backend_glmodelviewmatrix.m[0][0]);
 538         }
 539 }
 540
 541 // sets up the requested state
 542 void R_Mesh_MainState(const rmeshstate_t *m)
 543 {
 544         BACKENDACTIVECHECK
 545
 546         if (gl_state.blendfunc1 != m->blendfunc1 || gl_state.blendfunc2 != m->blendfunc2)
 547         {
 548                 qglBlendFunc(gl_state.blendfunc1 = m->blendfunc1, gl_state.blendfunc2 = m->blendfunc2);CHECKGLERROR
 549                 if (gl_state.blendfunc2 == GL_ZERO)
 550                 {
 551                         if (gl_state.blendfunc1 == GL_ONE)
 552                         {
 553                                 if (gl_state.blend)
 554                                 {
 555                                         gl_state.blend = 0;
 556                                         qglDisable(GL_BLEND);CHECKGLERROR
 557                                 }
 558                         }
 559                         else
 560                         {
 561                                 if (!gl_state.blend)
 562                                 {
 563                                         gl_state.blend = 1;
 564                                         qglEnable(GL_BLEND);CHECKGLERROR
 565                                 }
 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         if (gl_state.depthdisable != m->depthdisable)
 578         {
 579                 gl_state.depthdisable = m->depthdisable;
 580                 if (gl_state.depthdisable)
 581                         qglDisable(GL_DEPTH_TEST);
 582                 else
 583                         qglEnable(GL_DEPTH_TEST);
 584         }
 585         if (gl_state.depthmask != (m->blendfunc2 == GL_ZERO || m->depthwrite))
 586         {
 587                 qglDepthMask(gl_state.depthmask = (m->blendfunc2 == GL_ZERO || m->depthwrite));CHECKGLERROR
 588         }
 589 }
 590
 591 void R_Mesh_TextureState(const rmeshstate_t *m)
 592 {
 593         int i;
 594         float rgbscale;
 595         gltextureunit_t *unit;
 596
 597         BACKENDACTIVECHECK
 598
 599         if (gl_backend_rebindtextures)
 600         {
 601                 gl_backend_rebindtextures = false;
 602                 GL_SetupTextureState();
 603         }
 604
 605         for (i = 0;i < backendunits;i++)
 606         {
 607                 unit = gl_state.units + i;
 608                 if (unit->t1d != m->tex1d[i] || unit->t2d != m->tex[i] || unit->t3d != m->tex3d[i] || unit->tcubemap != m->texcubemap[i])
 609                 {
 610                         if (gl_state.unit != i)
 611                         {
 612                                 qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 613                         }
 614                         if (m->tex1d[i] || m->tex[i] || m->tex3d[i] || m->texcubemap[i])
 615                         {
 616                                 if (!unit->arrayenabled)
 617                                 {
 618                                         unit->arrayenabled = true;
 619                                         if (gl_state.clientunit != i)
 620                                         {
 621                                                 qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 622                                         }
 623                                         qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 624                                 }
 625                         }
 626                         else
 627                         {
 628                                 if (unit->arrayenabled)
 629                                 {
 630                                         unit->arrayenabled = false;
 631                                         if (gl_state.clientunit != i)
 632                                         {
 633                                                 qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 634                                         }
 635                                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 636                                 }
 637                         }
 638                         if (unit->t1d != m->tex1d[i])
 639                         {
 640                                 if (m->tex1d[i])
 641                                 {
 642                                         if (unit->t1d == 0)
 643                                                 qglEnable(GL_TEXTURE_1D);CHECKGLERROR
 644                                 }
 645                                 else
 646                                 {
 647                                         if (unit->t1d)
 648                                                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 649                                 }
 650                                 qglBindTexture(GL_TEXTURE_1D, (unit->t1d = m->tex1d[i]));CHECKGLERROR
 651                         }
 652                         if (unit->t2d != m->tex[i])
 653                         {
 654                                 if (m->tex[i])
 655                                 {
 656                                         if (unit->t2d == 0)
 657                                                 qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 658                                 }
 659                                 else
 660                                 {
 661                                         if (unit->t2d)
 662                                                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 663                                 }
 664                                 qglBindTexture(GL_TEXTURE_2D, (unit->t2d = m->tex[i]));CHECKGLERROR
 665                         }
 666                         if (unit->t3d != m->tex3d[i])
 667                         {
 668                                 if (m->tex3d[i])
 669                                 {
 670                                         if (unit->t3d == 0)
 671                                                 qglEnable(GL_TEXTURE_3D_EXT);CHECKGLERROR
 672                                 }
 673                                 else
 674                                 {
 675                                         if (unit->t3d)
 676                                                 qglDisable(GL_TEXTURE_3D_EXT);CHECKGLERROR
 677                                 }
 678                                 qglBindTexture(GL_TEXTURE_3D_EXT, (unit->t3d = m->tex3d[i]));CHECKGLERROR
 679                         }
 680                         if (unit->tcubemap != m->texcubemap[i])
 681                         {
 682                                 if (m->texcubemap[i])
 683                                 {
 684                                         if (unit->tcubemap == 0)
 685                                                 qglEnable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 686                                 }
 687                                 else
 688                                 {
 689                                         if (unit->tcubemap)
 690                                                 qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 691                                 }
 692                                 qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, (unit->tcubemap = m->texcubemap[i]));CHECKGLERROR
 693                         }
 694                 }
 695                 rgbscale = max(m->texrgbscale[i], 1);
 696                 if (gl_state.units[i].rgbscale != rgbscale)
 697                 {
 698                         if (gl_state.unit != i)
 699                         {
 700                                 qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 701                         }
 702                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, (gl_state.units[i].rgbscale = rgbscale));CHECKGLERROR
 703                 }
 704         }
 705 }
 706
 707 void R_Mesh_State(const rmeshstate_t *m)
 708 {
 709         R_Mesh_MainState(m);
 710         R_Mesh_TextureState(m);
 711 }
 712
 713 /*
 714 ==============================================================================
 715
 716                                                 SCREEN SHOTS
 717
 718 ==============================================================================
 719 */
 720
 721 qboolean SCR_ScreenShot(char *filename, int x, int y, int width, int height)
 722 {
 723         qboolean ret;
 724         int i;
 725         qbyte *buffer;
 726
 727         if (!r_render.integer)
 728                 return false;
 729
 730         buffer = Mem_Alloc(tempmempool, width*height*3);
 731         qglReadPixels (x, y, width, height, GL_RGB, GL_UNSIGNED_BYTE, buffer);
 732         CHECKGLERROR
 733
 734         // LordHavoc: compensate for v_overbrightbits when using hardware gamma
 735         if (v_hwgamma.integer)
 736                 for (i = 0;i < width * height * 3;i++)
 737                         buffer[i] <<= v_overbrightbits.integer;
 738
 739         ret = Image_WriteTGARGB_preflipped(filename, width, height, buffer);
 740
 741         Mem_Free(buffer);
 742         return ret;
 743 }
 744
 745 //=============================================================================
 746
 747 void R_ClearScreen(void)
 748 {
 749         if (r_render.integer)
 750         {
 751                 // clear to black
 752                 qglClearColor(0,0,0,0);CHECKGLERROR
 753                 // clear the screen
 754                 qglClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);CHECKGLERROR
 755                 // set dithering mode
 756                 if (gl_dither.integer)
 757                 {
 758                         qglEnable(GL_DITHER);CHECKGLERROR
 759                 }
 760                 else
 761                 {
 762                         qglDisable(GL_DITHER);CHECKGLERROR
 763                 }
 764         }
 765 }
 766
 767 /*
 768 ==================
 769 SCR_UpdateScreen
 770
 771 This is called every frame, and can also be called explicitly to flush
 772 text to the screen.
 773 ==================
 774 */
 775 void SCR_UpdateScreen (void)
 776 {
 777         VID_Finish ();
 778
 779         R_TimeReport("finish");
 780
 781         if (r_textureunits.integer > gl_textureunits)
 782                 Cvar_SetValueQuick(&r_textureunits, gl_textureunits);
 783         if (r_textureunits.integer < 1)
 784                 Cvar_SetValueQuick(&r_textureunits, 1);
 785
 786         if (gl_combine.integer && (!gl_combine_extension || r_textureunits.integer < 2))
 787                 Cvar_SetValueQuick(&gl_combine, 0);
 788
 789         // lighting scale
 790         r_colorscale = 1.0f / (float) (1 << v_overbrightbits.integer);
 791
 792         // lightmaps only
 793         r_lightmapscalebit = v_overbrightbits.integer;
 794         if (gl_combine.integer && r_textureunits.integer > 1)
 795                 r_lightmapscalebit += 2;
 796
 797         R_TimeReport("setup");
 798
 799         R_ClearScreen();
 800
 801         R_TimeReport("clear");
 802
 803         if (scr_conlines < vid.conheight && cls.signon == SIGNONS)
 804                 R_RenderView();
 805
 806         // draw 2D stuff
 807         R_DrawQueue();
 808
 809         // tell driver to commit it's partially full geometry queue to the rendering queue
 810         // (this doesn't wait for the commands themselves to complete)
 811         qglFlush();
 812 }
 813