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 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_PerspectiveInfiniteFarClip (double fovx, double fovy, double zNear)
 244 {
 245         double nudge, m[16];
 246
 247         if (!r_render.integer)
 248                 return;
 249
 250         // set up viewpoint
 251         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 252         qglLoadIdentity ();CHECKGLERROR
 253         // set view pyramid
 254         nudge = 1.0 - 1.0 / (1<<23);
 255         m[ 0] = 1.0 / tan(fovx * M_PI / 360.0);
 256         m[ 1] = 0;
 257         m[ 2] = 0;
 258         m[ 3] = 0;
 259         m[ 4] = 0;
 260         m[ 5] = 1.0 / tan(fovy * M_PI / 360.0);
 261         m[ 6] = 0;
 262         m[ 7] = 0;
 263         m[ 8] = 0;
 264         m[ 9] = 0;
 265         m[10] = -1 * nudge;
 266         m[11] = -1 * nudge;
 267         m[12] = 0;
 268         m[13] = 0;
 269         m[14] = -2 * zNear * nudge;
 270         m[15] = 0;
 271         qglLoadMatrixd(m);
 272         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 273         GL_SetupView_Orientation_Identity();
 274 }
 275
 276 void GL_SetupView_Mode_Ortho (double x1, double y1, double x2, double y2, double zNear, double zFar)
 277 {
 278         if (!r_render.integer)
 279                 return;
 280
 281         // set up viewpoint
 282         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 283         qglLoadIdentity ();CHECKGLERROR
 284         qglOrtho(x1, x2, y2, y1, zNear, zFar);
 285         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 286         GL_SetupView_Orientation_Identity();
 287 }
 288
 289 typedef struct gltextureunit_s
 290 {
 291         unsigned int t1d, t2d, t3d, tcubemap;
 292         unsigned int arrayenabled;
 293         float rgbscale;
 294         int combinergb, combinealpha;
 295         // FIXME: add more combine stuff
 296 }
 297 gltextureunit_t;
 298
 299 static struct
 300 {
 301         int blendfunc1;
 302         int blendfunc2;
 303         int blend;
 304         GLboolean depthmask;
 305         int depthdisable;
 306         int unit;
 307         int clientunit;
 308         gltextureunit_t units[MAX_TEXTUREUNITS];
 309         int colorarray;
 310 }
 311 gl_state;
 312
 313 void GL_SetupTextureState(void)
 314 {
 315         int i;
 316         gltextureunit_t *unit;
 317         for (i = 0;i < backendunits;i++)
 318         {
 319                 if (qglActiveTexture)
 320                         qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 321                 if (qglClientActiveTexture)
 322                         qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 323                 unit = gl_state.units + i;
 324                 unit->t1d = 0;
 325                 unit->t2d = 0;
 326                 unit->t3d = 0;
 327                 unit->tcubemap = 0;
 328                 unit->rgbscale = 1;
 329                 unit->combinergb = GL_MODULATE;
 330                 unit->combinealpha = GL_MODULATE;
 331                 unit->arrayenabled = false;
 332                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 333                 if (gl_texture3d)
 334                 {
 335                         qglTexCoordPointer(3, GL_FLOAT, sizeof(float[4]), varray_texcoord[i]);CHECKGLERROR
 336                 }
 337                 else
 338                 {
 339                         qglTexCoordPointer(2, GL_FLOAT, sizeof(float[4]), varray_texcoord[i]);CHECKGLERROR
 340                 }
 341                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 342                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 343                 if (gl_texture3d)
 344                 {
 345                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 346                 }
 347                 if (gl_texturecubemap)
 348                 {
 349                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 350                 }
 351                 if (gl_combine.integer)
 352                 {
 353                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);CHECKGLERROR
 354                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_MODULATE);CHECKGLERROR
 355                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE);CHECKGLERROR
 356                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 357                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_RGB_ARB, GL_CONSTANT_ARB);CHECKGLERROR
 358                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 359                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 360                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_RGB_ARB, GL_SRC_ALPHA);CHECKGLERROR
 361                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, GL_MODULATE);CHECKGLERROR
 362                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA_ARB, GL_TEXTURE);CHECKGLERROR
 363                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_ALPHA_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 364                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_ALPHA_ARB, GL_CONSTANT_ARB);CHECKGLERROR
 365                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 366                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 367                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 368                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
 369                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
 370                 }
 371                 else
 372                 {
 373                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 374                 }
 375         }
 376 }
 377
 378 void GL_Backend_ResetState(void)
 379 {
 380         memset(&gl_state, 0, sizeof(gl_state));
 381         gl_state.depthdisable = false;
 382         gl_state.blendfunc1 = GL_ONE;
 383         gl_state.blendfunc2 = GL_ZERO;
 384         gl_state.blend = false;
 385         gl_state.depthmask = GL_TRUE;
 386         gl_state.colorarray = false;
 387
 388         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 389         qglDisableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 390
 391         qglEnable(GL_CULL_FACE);CHECKGLERROR
 392         qglCullFace(GL_FRONT);CHECKGLERROR
 393         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 394         qglBlendFunc(gl_state.blendfunc1, gl_state.blendfunc2);CHECKGLERROR
 395         qglDisable(GL_BLEND);CHECKGLERROR
 396         qglDepthMask(gl_state.depthmask);CHECKGLERROR
 397         qglVertexPointer(3, GL_FLOAT, sizeof(float[4]), varray_vertex);CHECKGLERROR
 398         qglEnableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 399         if (gl_mesh_floatcolors.integer)
 400         {
 401                 qglColorPointer(4, GL_FLOAT, sizeof(float[4]), varray_color);CHECKGLERROR
 402         }
 403         else
 404         {
 405                 qglColorPointer(4, GL_UNSIGNED_BYTE, sizeof(qbyte[4]), varray_bcolor);CHECKGLERROR
 406         }
 407         GL_Color(1, 1, 1, 1);
 408
 409         GL_SetupTextureState();
 410 }
 411
 412 void GL_UseColorArray(void)
 413 {
 414         if (!gl_state.colorarray)
 415         {
 416                 gl_state.colorarray = true;
 417                 qglEnableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 418         }
 419 }
 420
 421 void GL_Color(float cr, float cg, float cb, float ca)
 422 {
 423         if (gl_state.colorarray)
 424         {
 425                 gl_state.colorarray = false;
 426                 qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 427         }
 428         qglColor4f(cr, cg, cb, ca);
 429 }
 430
 431 // called at beginning of frame
 432 void R_Mesh_Start(void)
 433 {
 434         BACKENDACTIVECHECK
 435
 436         CHECKGLERROR
 437
 438         GL_Backend_CheckCvars();
 439         if (mesh_maxverts != gl_mesh_maxverts.integer)
 440                 GL_Backend_ResizeArrays(gl_mesh_maxverts.integer);
 441
 442         GL_Backend_ResetState();
 443 }
 444
 445 int gl_backend_rebindtextures;
 446
 447 void GL_ConvertColorsFloatToByte(int numverts)
 448 {
 449         int i, k, total;
 450         // LordHavoc: to avoid problems with aliasing (treating memory as two
 451         // different types - exactly what this is doing), these must be volatile
 452         // (or a union)
 453         volatile int *icolor;
 454         volatile float *fcolor;
 455         qbyte *bcolor;
 456
 457         total = numverts * 4;
 458
 459         // shift float to have 8bit fraction at base of number
 460         fcolor = varray_color;
 461         for (i = 0;i < total;)
 462         {
 463                 fcolor[i    ] += 32768.0f;
 464                 fcolor[i + 1] += 32768.0f;
 465                 fcolor[i + 2] += 32768.0f;
 466                 fcolor[i + 3] += 32768.0f;
 467                 i += 4;
 468         }
 469
 470         // then read as integer and kill float bits...
 471         icolor = (int *)varray_color;
 472         bcolor = varray_bcolor;
 473         for (i = 0;i < total;)
 474         {
 475                 k = icolor[i    ] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i    ] = (qbyte) k;
 476                 k = icolor[i + 1] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i + 1] = (qbyte) k;
 477                 k = icolor[i + 2] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i + 2] = (qbyte) k;
 478                 k = icolor[i + 3] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i + 3] = (qbyte) k;
 479                 i += 4;
 480         }
 481 }
 482
 483 void GL_DrawRangeElements(int firstvert, int endvert, int indexcount, const int *index)
 484 {
 485         int arraylocked = false;
 486         c_meshs++;
 487         c_meshelements += indexcount;
 488         if (indexcount == 0 || endvert == firstvert)
 489         {
 490                 Con_Printf("GL_DrawRangeElements(%d, %d, %d, %08p);\n", firstvert, endvert, indexcount, index);
 491                 return;
 492         }
 493         if (gl_supportslockarrays && gl_lockarrays.integer)
 494         {
 495                 qglLockArraysEXT(firstvert, endvert - firstvert);
 496                 CHECKGLERROR
 497                 arraylocked = true;
 498         }
 499         if (gl_mesh_drawrangeelements.integer && qglDrawRangeElements != NULL)
 500                 qglDrawRangeElements(GL_TRIANGLES, firstvert, endvert, indexcount, GL_UNSIGNED_INT, (const GLuint *) index);
 501         else
 502                 qglDrawElements(GL_TRIANGLES, indexcount, GL_UNSIGNED_INT, (const GLuint *) index);
 503         CHECKGLERROR
 504         if (arraylocked)
 505         {
 506                 qglUnlockArraysEXT();
 507                 CHECKGLERROR
 508                 arraylocked = false;
 509         }
 510 }
 511
 512 // enlarges geometry buffers if they are too small
 513 void _R_Mesh_ResizeCheck(int numverts)
 514 {
 515         if (numverts > mesh_maxverts)
 516         {
 517                 BACKENDACTIVECHECK
 518                 GL_Backend_ResizeArrays(numverts + 100);
 519                 GL_Backend_ResetState();
 520         }
 521 }
 522
 523 // renders the mesh
 524 void R_Mesh_Draw(int numverts, int numtriangles, const int *elements)
 525 {
 526         BACKENDACTIVECHECK
 527
 528         CHECKGLERROR
 529
 530         if (gl_state.colorarray && !gl_mesh_floatcolors.integer)
 531                 GL_ConvertColorsFloatToByte(numverts);
 532         if (!r_render.integer)
 533                 return;
 534         GL_DrawRangeElements(0, numverts, numtriangles * 3, elements);
 535 }
 536
 537 // restores backend state, used when done with 3D rendering
 538 void R_Mesh_Finish(void)
 539 {
 540         int i;
 541         BACKENDACTIVECHECK
 542
 543         for (i = backendunits - 1;i >= 0;i--)
 544         {
 545                 if (qglActiveTexture)
 546                         qglActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
 547                 if (qglClientActiveTexture)
 548                         qglClientActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
 549                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 550                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 551                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 552                 if (gl_texture3d)
 553                 {
 554                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 555                 }
 556                 if (gl_texturecubemap)
 557                 {
 558                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 559                 }
 560                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 561                 if (gl_combine.integer)
 562                 {
 563                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
 564                 }
 565         }
 566         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 567         qglDisableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 568
 569         qglDisable(GL_BLEND);CHECKGLERROR
 570         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 571         qglDepthMask(GL_TRUE);CHECKGLERROR
 572         qglBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);CHECKGLERROR
 573 }
 574
 575 void R_Mesh_Matrix(const matrix4x4_t *matrix)
 576 {
 577         if (memcmp(matrix, &backend_modelmatrix, sizeof(matrix4x4_t)))
 578         {
 579                 backend_modelmatrix = *matrix;
 580                 Matrix4x4_Concat(&backend_modelviewmatrix, &backend_viewmatrix, matrix);
 581                 Matrix4x4_Transpose(&backend_glmodelviewmatrix, &backend_modelviewmatrix);
 582                 qglLoadMatrixf(&backend_glmodelviewmatrix.m[0][0]);
 583         }
 584 }
 585
 586 // sets up the requested state
 587 void R_Mesh_MainState(const rmeshstate_t *m)
 588 {
 589         BACKENDACTIVECHECK
 590
 591         if (gl_state.blendfunc1 != m->blendfunc1 || gl_state.blendfunc2 != m->blendfunc2)
 592         {
 593                 qglBlendFunc(gl_state.blendfunc1 = m->blendfunc1, gl_state.blendfunc2 = m->blendfunc2);CHECKGLERROR
 594                 if (gl_state.blendfunc2 == GL_ZERO)
 595                 {
 596                         if (gl_state.blendfunc1 == GL_ONE)
 597                         {
 598                                 if (gl_state.blend)
 599                                 {
 600                                         gl_state.blend = 0;
 601                                         qglDisable(GL_BLEND);CHECKGLERROR
 602                                 }
 603                         }
 604                         else
 605                         {
 606                                 if (!gl_state.blend)
 607                                 {
 608                                         gl_state.blend = 1;
 609                                         qglEnable(GL_BLEND);CHECKGLERROR
 610                                 }
 611                         }
 612                 }
 613                 else
 614                 {
 615                         if (!gl_state.blend)
 616                         {
 617                                 gl_state.blend = 1;
 618                                 qglEnable(GL_BLEND);CHECKGLERROR
 619                         }
 620                 }
 621         }
 622         if (gl_state.depthdisable != m->depthdisable)
 623         {
 624                 gl_state.depthdisable = m->depthdisable;
 625                 if (gl_state.depthdisable)
 626                         qglDisable(GL_DEPTH_TEST);
 627                 else
 628                         qglEnable(GL_DEPTH_TEST);
 629         }
 630         if (gl_state.depthmask != (m->blendfunc2 == GL_ZERO || m->depthwrite))
 631         {
 632                 qglDepthMask(gl_state.depthmask = (m->blendfunc2 == GL_ZERO || m->depthwrite));CHECKGLERROR
 633         }
 634 }
 635
 636 void R_Mesh_TextureState(const rmeshstate_t *m)
 637 {
 638         int i, combinergb, combinealpha;
 639         float rgbscale;
 640         gltextureunit_t *unit;
 641
 642         BACKENDACTIVECHECK
 643
 644         if (gl_backend_rebindtextures)
 645         {
 646                 gl_backend_rebindtextures = false;
 647                 GL_SetupTextureState();
 648         }
 649
 650         for (i = 0;i < backendunits;i++)
 651         {
 652                 unit = gl_state.units + i;
 653                 if (unit->t1d != m->tex1d[i] || unit->t2d != m->tex[i] || unit->t3d != m->tex3d[i] || unit->tcubemap != m->texcubemap[i])
 654                 {
 655                         if (gl_state.unit != i)
 656                         {
 657                                 qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 658                         }
 659                         if (m->tex1d[i] || m->tex[i] || m->tex3d[i] || m->texcubemap[i])
 660                         {
 661                                 if (!unit->arrayenabled)
 662                                 {
 663                                         unit->arrayenabled = true;
 664                                         if (gl_state.clientunit != i)
 665                                         {
 666                                                 qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 667                                         }
 668                                         qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 669                                 }
 670                         }
 671                         else
 672                         {
 673                                 if (unit->arrayenabled)
 674                                 {
 675                                         unit->arrayenabled = false;
 676                                         if (gl_state.clientunit != i)
 677                                         {
 678                                                 qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 679                                         }
 680                                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 681                                 }
 682                         }
 683                         combinergb = m->texcombinergb[i];
 684                         combinealpha = m->texcombinealpha[i];
 685                         if (!combinergb)
 686                                 combinergb = GL_MODULATE;
 687                         if (!combinealpha)
 688                                 combinealpha = GL_MODULATE;
 689                         if (unit->combinergb != combinergb)
 690                         {
 691                                 unit->combinergb = combinergb;
 692                                 if (gl_combine.integer)
 693                                 {
 694                                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, unit->combinergb);CHECKGLERROR
 695                                 }
 696                                 else
 697                                 {
 698                                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, unit->combinergb);CHECKGLERROR
 699                                 }
 700                         }
 701                         if (unit->combinealpha != combinealpha)
 702                         {
 703                                 unit->combinealpha = combinealpha;
 704                                 if (gl_combine.integer)
 705                                 {
 706                                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, unit->combinealpha);CHECKGLERROR
 707                                 }
 708                         }
 709                         if (unit->t1d != m->tex1d[i])
 710                         {
 711                                 if (m->tex1d[i])
 712                                 {
 713                                         if (unit->t1d == 0)
 714                                                 qglEnable(GL_TEXTURE_1D);CHECKGLERROR
 715                                 }
 716                                 else
 717                                 {
 718                                         if (unit->t1d)
 719                                                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 720                                 }
 721                                 qglBindTexture(GL_TEXTURE_1D, (unit->t1d = m->tex1d[i]));CHECKGLERROR
 722                         }
 723                         if (unit->t2d != m->tex[i])
 724                         {
 725                                 if (m->tex[i])
 726                                 {
 727                                         if (unit->t2d == 0)
 728                                                 qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 729                                 }
 730                                 else
 731                                 {
 732                                         if (unit->t2d)
 733                                                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 734                                 }
 735                                 qglBindTexture(GL_TEXTURE_2D, (unit->t2d = m->tex[i]));CHECKGLERROR
 736                         }
 737                         if (unit->t3d != m->tex3d[i])
 738                         {
 739                                 if (m->tex3d[i])
 740                                 {
 741                                         if (unit->t3d == 0)
 742                                                 qglEnable(GL_TEXTURE_3D);CHECKGLERROR
 743                                 }
 744                                 else
 745                                 {
 746                                         if (unit->t3d)
 747                                                 qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 748                                 }
 749                                 qglBindTexture(GL_TEXTURE_3D, (unit->t3d = m->tex3d[i]));CHECKGLERROR
 750                         }
 751                         if (unit->tcubemap != m->texcubemap[i])
 752                         {
 753                                 if (m->texcubemap[i])
 754                                 {
 755                                         if (unit->tcubemap == 0)
 756                                                 qglEnable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 757                                 }
 758                                 else
 759                                 {
 760                                         if (unit->tcubemap)
 761                                                 qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 762                                 }
 763                                 qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, (unit->tcubemap = m->texcubemap[i]));CHECKGLERROR
 764                         }
 765                 }
 766                 rgbscale = max(m->texrgbscale[i], 1);
 767                 if (gl_state.units[i].rgbscale != rgbscale)
 768                 {
 769                         if (gl_state.unit != i)
 770                         {
 771                                 qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 772                         }
 773                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, (gl_state.units[i].rgbscale = rgbscale));CHECKGLERROR
 774                 }
 775         }
 776 }
 777
 778 void R_Mesh_State(const rmeshstate_t *m)
 779 {
 780         R_Mesh_MainState(m);
 781         R_Mesh_TextureState(m);
 782 }
 783
 784 /*
 785 ==============================================================================
 786
 787                                                 SCREEN SHOTS
 788
 789 ==============================================================================
 790 */
 791
 792 qboolean SCR_ScreenShot(char *filename, int x, int y, int width, int height)
 793 {
 794         qboolean ret;
 795         int i;
 796         qbyte *buffer;
 797
 798         if (!r_render.integer)
 799                 return false;
 800
 801         buffer = Mem_Alloc(tempmempool, width*height*3);
 802         qglReadPixels (x, y, width, height, GL_RGB, GL_UNSIGNED_BYTE, buffer);
 803         CHECKGLERROR
 804
 805         // LordHavoc: compensate for v_overbrightbits when using hardware gamma
 806         if (v_hwgamma.integer)
 807                 for (i = 0;i < width * height * 3;i++)
 808                         buffer[i] <<= v_overbrightbits.integer;
 809
 810         ret = Image_WriteTGARGB_preflipped(filename, width, height, buffer);
 811
 812         Mem_Free(buffer);
 813         return ret;
 814 }
 815
 816 //=============================================================================
 817
 818 void R_ClearScreen(void)
 819 {
 820         if (r_render.integer)
 821         {
 822                 // clear to black
 823                 qglClearColor(0,0,0,0);CHECKGLERROR
 824                 // clear the screen
 825                 qglClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);CHECKGLERROR
 826                 // set dithering mode
 827                 if (gl_dither.integer)
 828                 {
 829                         qglEnable(GL_DITHER);CHECKGLERROR
 830                 }
 831                 else
 832                 {
 833                         qglDisable(GL_DITHER);CHECKGLERROR
 834                 }
 835         }
 836 }
 837
 838 /*
 839 ==================
 840 SCR_UpdateScreen
 841
 842 This is called every frame, and can also be called explicitly to flush
 843 text to the screen.
 844 ==================
 845 */
 846 void SCR_UpdateScreen (void)
 847 {
 848         VID_Finish ();
 849
 850         R_TimeReport("finish");
 851
 852         if (r_textureunits.integer > gl_textureunits)
 853                 Cvar_SetValueQuick(&r_textureunits, gl_textureunits);
 854         if (r_textureunits.integer < 1)
 855                 Cvar_SetValueQuick(&r_textureunits, 1);
 856
 857         if (gl_combine.integer && (!gl_combine_extension || r_textureunits.integer < 2))
 858                 Cvar_SetValueQuick(&gl_combine, 0);
 859
 860         // lighting scale
 861         r_colorscale = 1.0f / (float) (1 << v_overbrightbits.integer);
 862
 863         // lightmaps only
 864         r_lightmapscalebit = v_overbrightbits.integer;
 865         if (gl_combine.integer && r_textureunits.integer > 1)
 866                 r_lightmapscalebit += 2;
 867
 868         R_TimeReport("setup");
 869
 870         R_ClearScreen();
 871
 872         R_TimeReport("clear");
 873
 874         if (scr_conlines < vid.conheight && cls.signon == SIGNONS)
 875                 R_RenderView();
 876
 877         // draw 2D stuff
 878         R_DrawQueue();
 879
 880         // tell driver to commit it's partially full geometry queue to the rendering queue
 881         // (this doesn't wait for the commands themselves to complete)
 882         qglFlush();
 883 }
 884