gl_backend.c

   1
   2 #include "quakedef.h"
   3
   4 cvar_t gl_mesh_maxtriangles = {0, "gl_mesh_maxtriangles", "1024"};
   5 cvar_t gl_mesh_floatcolors = {0, "gl_mesh_floatcolors", "1"};
   6 cvar_t gl_mesh_drawmode = {CVAR_SAVE, "gl_mesh_drawmode", "3"};
   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 // this is used to increase gl_mesh_maxtriangles automatically if a mesh was
  13 // too large for the buffers in the previous frame
  14 int overflowedverts = 0;
  15
  16 int gl_maxdrawrangeelementsvertices;
  17 int gl_maxdrawrangeelementsindices;
  18
  19 #ifdef DEBUGGL
  20 int errornumber = 0;
  21
  22 void GL_PrintError(int errornumber, char *filename, int linenumber)
  23 {
  24         switch(errornumber)
  25         {
  26 #ifdef GL_INVALID_ENUM
  27         case GL_INVALID_ENUM:
  28                 Con_Printf("GL_INVALID_ENUM at %s:%i\n", filename, linenumber);
  29                 break;
  30 #endif
  31 #ifdef GL_INVALID_VALUE
  32         case GL_INVALID_VALUE:
  33                 Con_Printf("GL_INVALID_VALUE at %s:%i\n", filename, linenumber);
  34                 break;
  35 #endif
  36 #ifdef GL_INVALID_OPERATION
  37         case GL_INVALID_OPERATION:
  38                 Con_Printf("GL_INVALID_OPERATION at %s:%i\n", filename, linenumber);
  39                 break;
  40 #endif
  41 #ifdef GL_STACK_OVERFLOW
  42         case GL_STACK_OVERFLOW:
  43                 Con_Printf("GL_STACK_OVERFLOW at %s:%i\n", filename, linenumber);
  44                 break;
  45 #endif
  46 #ifdef GL_STACK_UNDERFLOW
  47         case GL_STACK_UNDERFLOW:
  48                 Con_Printf("GL_STACK_UNDERFLOW at %s:%i\n", filename, linenumber);
  49                 break;
  50 #endif
  51 #ifdef GL_OUT_OF_MEMORY
  52         case GL_OUT_OF_MEMORY:
  53                 Con_Printf("GL_OUT_OF_MEMORY at %s:%i\n", filename, linenumber);
  54                 break;
  55 #endif
  56 #ifdef GL_TABLE_TOO_LARGE
  57     case GL_TABLE_TOO_LARGE:
  58                 Con_Printf("GL_TABLE_TOO_LARGE at %s:%i\n", filename, linenumber);
  59                 break;
  60 #endif
  61         default:
  62                 Con_Printf("GL UNKNOWN (%i) at %s:%i\n", errornumber, filename, linenumber);
  63                 break;
  64         }
  65 }
  66 #endif
  67
  68 #define BACKENDACTIVECHECK if (!backendactive) Sys_Error(__func__ " called when backend is not active\n");
  69
  70 float r_mesh_farclip;
  71
  72 static float viewdist;
  73 // sign bits (true if negative) for vpn[] entries, so quick integer compares can be used instead of float compares
  74 static int vpnbit0, vpnbit1, vpnbit2;
  75
  76 int c_meshs, c_meshtris;
  77
  78 int lightscalebit;
  79 float lightscale;
  80 float overbrightscale;
  81
  82 void SCR_ScreenShot_f (void);
  83
  84 // these are externally accessible
  85 float mesh_colorscale;
  86 int *varray_element;
  87 float *varray_vertex;
  88 float *varray_color;
  89 float *varray_texcoord[MAX_TEXTUREUNITS];
  90 int mesh_maxtris;
  91 int mesh_maxverts; // always mesh_maxtris * 3
  92
  93 static matrix4x4_t backendmatrix;
  94
  95 static int backendunits, backendactive;
  96 static qbyte *varray_bcolor;
  97 static mempool_t *gl_backend_mempool;
  98
  99 void GL_Backend_AllocArrays(void)
 100 {
 101         int i;
 102
 103         if (!gl_backend_mempool)
 104                 gl_backend_mempool = Mem_AllocPool("GL_Backend");
 105
 106         mesh_maxverts = mesh_maxtris * 3;
 107
 108         varray_element = Mem_Alloc(gl_backend_mempool, mesh_maxtris * sizeof(int[3]));
 109         varray_vertex = Mem_Alloc(gl_backend_mempool, mesh_maxverts * sizeof(float[4]));
 110         varray_color = Mem_Alloc(gl_backend_mempool, mesh_maxverts * sizeof(float[4]));
 111         varray_bcolor = Mem_Alloc(gl_backend_mempool, mesh_maxverts * sizeof(qbyte[4]));
 112         for (i = 0;i < backendunits;i++)
 113                 varray_texcoord[i] = Mem_Alloc(gl_backend_mempool, mesh_maxverts * sizeof(float[2]));
 114         for (;i < MAX_TEXTUREUNITS;i++)
 115                 varray_texcoord[i] = NULL;
 116 }
 117
 118 void GL_Backend_FreeArrays(int resizingbuffers)
 119 {
 120         int i;
 121         if (resizingbuffers)
 122                 Mem_EmptyPool(gl_backend_mempool);
 123         else
 124                 Mem_FreePool(&gl_backend_mempool);
 125         varray_element = NULL;
 126         varray_vertex = NULL;
 127         varray_color = NULL;
 128         varray_bcolor = NULL;
 129         for (i = 0;i < MAX_TEXTUREUNITS;i++)
 130                 varray_texcoord[i] = NULL;
 131 }
 132
 133 static void gl_backend_start(void)
 134 {
 135         Con_Printf("OpenGL Backend started with gl_mesh_maxtriangles %i\n", gl_mesh_maxtriangles.integer);
 136         if (qglDrawRangeElements != NULL)
 137         {
 138                 qglGetIntegerv(GL_MAX_ELEMENTS_VERTICES, &gl_maxdrawrangeelementsvertices);
 139                 qglGetIntegerv(GL_MAX_ELEMENTS_INDICES, &gl_maxdrawrangeelementsindices);
 140                 CHECKGLERROR
 141                 Con_Printf("glDrawRangeElements detected (max vertices %i, max indices %i)\n", gl_maxdrawrangeelementsvertices, gl_maxdrawrangeelementsindices);
 142         }
 143         if (strstr(gl_renderer, "3Dfx"))
 144         {
 145                 Con_Printf("3Dfx driver detected, forcing gl_mesh_floatcolors to 0 to prevent crashs\n");
 146                 Cvar_SetValueQuick(&gl_mesh_floatcolors, 0);
 147         }
 148
 149         backendunits = min(MAX_TEXTUREUNITS, gl_textureunits);
 150
 151         GL_Backend_AllocArrays();
 152
 153         backendactive = true;
 154 }
 155
 156 static void gl_backend_shutdown(void)
 157 {
 158         backendunits = 0;
 159         backendactive = false;
 160
 161         Con_Printf("OpenGL Backend shutting down\n");
 162
 163         GL_Backend_FreeArrays(false);
 164 }
 165
 166 void GL_Backend_CheckCvars(void)
 167 {
 168         if (gl_mesh_drawmode.integer < 0)
 169                 Cvar_SetValueQuick(&gl_mesh_drawmode, 0);
 170         if (gl_mesh_drawmode.integer > 3)
 171                 Cvar_SetValueQuick(&gl_mesh_drawmode, 3);
 172
 173         // change drawmode 3 to 2 if 3 won't work
 174         if (gl_mesh_drawmode.integer >= 3 && qglDrawRangeElements == NULL)
 175                 Cvar_SetValueQuick(&gl_mesh_drawmode, 2);
 176
 177         // 21760 is (65536 / 3) rounded off to a multiple of 128
 178         if (gl_mesh_maxtriangles.integer < 1024)
 179                 Cvar_SetValueQuick(&gl_mesh_maxtriangles, 1024);
 180         if (gl_mesh_maxtriangles.integer > 21760)
 181                 Cvar_SetValueQuick(&gl_mesh_maxtriangles, 21760);
 182 }
 183
 184 void GL_Backend_ResizeArrays(int numtriangles)
 185 {
 186         Cvar_SetValueQuick(&gl_mesh_maxtriangles, numtriangles);
 187         GL_Backend_CheckCvars();
 188         mesh_maxtris = gl_mesh_maxtriangles.integer;
 189         GL_Backend_FreeArrays(true);
 190         GL_Backend_AllocArrays();
 191 }
 192
 193 static void gl_backend_newmap(void)
 194 {
 195 }
 196
 197 void gl_backend_init(void)
 198 {
 199         Cvar_RegisterVariable(&r_render);
 200         Cvar_RegisterVariable(&gl_dither);
 201         Cvar_RegisterVariable(&gl_lockarrays);
 202 #ifdef NORENDER
 203         Cvar_SetValue("r_render", 0);
 204 #endif
 205
 206         Cvar_RegisterVariable(&gl_mesh_maxtriangles);
 207         Cvar_RegisterVariable(&gl_mesh_floatcolors);
 208         Cvar_RegisterVariable(&gl_mesh_drawmode);
 209         GL_Backend_CheckCvars();
 210         R_RegisterModule("GL_Backend", gl_backend_start, gl_backend_shutdown, gl_backend_newmap);
 211 }
 212
 213 int arraylocked = false;
 214
 215 void GL_LockArray(int first, int count)
 216 {
 217         if (!arraylocked && gl_supportslockarrays && gl_lockarrays.integer && gl_mesh_drawmode.integer > 0)
 218         {
 219                 qglLockArraysEXT(first, count);
 220                 CHECKGLERROR
 221                 arraylocked = true;
 222         }
 223 }
 224
 225 void GL_UnlockArray(void)
 226 {
 227         if (arraylocked)
 228         {
 229                 qglUnlockArraysEXT();
 230                 CHECKGLERROR
 231                 arraylocked = false;
 232         }
 233 }
 234
 235 /*
 236 =============
 237 GL_SetupFrame
 238 =============
 239 */
 240 static void GL_SetupFrame (void)
 241 {
 242         double xmax, ymax;
 243         double fovx, fovy, zNear, zFar, aspect;
 244
 245         if (!r_render.integer)
 246                 return;
 247
 248         qglDepthFunc (GL_LEQUAL);CHECKGLERROR
 249
 250         // set up viewpoint
 251         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 252         qglLoadIdentity ();CHECKGLERROR
 253
 254         // y is weird beause OpenGL is bottom to top, we use top to bottom
 255         qglViewport(r_refdef.x, vid.realheight - (r_refdef.y + r_refdef.height), r_refdef.width, r_refdef.height);CHECKGLERROR
 256
 257         // depth range
 258         zNear = 1.0;
 259         zFar = r_mesh_farclip;
 260         if (zFar < 64)
 261                 zFar = 64;
 262
 263         // fov angles
 264         fovx = r_refdef.fov_x;
 265         fovy = r_refdef.fov_y;
 266         aspect = r_refdef.width / r_refdef.height;
 267
 268         // pyramid slopes
 269         xmax = zNear * tan(fovx * M_PI / 360.0) * aspect;
 270         ymax = zNear * tan(fovy * M_PI / 360.0);
 271
 272         // set view pyramid
 273         qglFrustum(-xmax, xmax, -ymax, ymax, zNear, zFar);CHECKGLERROR
 274
 275         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 276         qglLoadIdentity ();CHECKGLERROR
 277
 278         // put Z going up
 279         qglRotatef (-90,  1, 0, 0);CHECKGLERROR
 280         qglRotatef (90,  0, 0, 1);CHECKGLERROR
 281         // camera rotation
 282         qglRotatef (-r_refdef.viewangles[2],  1, 0, 0);CHECKGLERROR
 283         qglRotatef (-r_refdef.viewangles[0],  0, 1, 0);CHECKGLERROR
 284         qglRotatef (-r_refdef.viewangles[1],  0, 0, 1);CHECKGLERROR
 285         // camera location
 286         qglTranslatef (-r_refdef.vieworg[0],  -r_refdef.vieworg[1],  -r_refdef.vieworg[2]);CHECKGLERROR
 287 }
 288
 289 static struct
 290 {
 291         int blendfunc1;
 292         int blendfunc2;
 293         int blend;
 294         GLboolean depthmask;
 295         int depthdisable;
 296         int unit;
 297         int clientunit;
 298         int texture[MAX_TEXTUREUNITS];
 299         float texturergbscale[MAX_TEXTUREUNITS];
 300 }
 301 gl_state;
 302
 303 void GL_SetupTextureState(void)
 304 {
 305         int i;
 306         if (backendunits > 1)
 307         {
 308                 for (i = 0;i < backendunits;i++)
 309                 {
 310                         qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 311                         qglBindTexture(GL_TEXTURE_2D, gl_state.texture[i]);CHECKGLERROR
 312                         if (gl_combine.integer)
 313                         {
 314                                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);CHECKGLERROR
 315                                 qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_MODULATE);CHECKGLERROR
 316                                 qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE);CHECKGLERROR
 317                                 qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 318                                 qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_RGB_ARB, GL_CONSTANT_ARB);CHECKGLERROR
 319                                 qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 320                                 qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 321                                 qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_RGB_ARB, GL_SRC_ALPHA);CHECKGLERROR
 322                                 qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, GL_MODULATE);CHECKGLERROR
 323                                 qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA_ARB, GL_TEXTURE);CHECKGLERROR
 324                                 qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_ALPHA_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 325                                 qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_ALPHA_ARB, GL_CONSTANT_ARB);CHECKGLERROR
 326                                 qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 327                                 qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 328                                 qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 329                                 qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, gl_state.texturergbscale[i]);CHECKGLERROR
 330                                 qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
 331                         }
 332                         else
 333                         {
 334                                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 335                         }
 336                         if (gl_state.texture[i])
 337                         {
 338                                 qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 339                         }
 340                         else
 341                         {
 342                                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 343                         }
 344                         if (gl_mesh_drawmode.integer > 0)
 345                         {
 346                                 qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 347                                 qglTexCoordPointer(2, GL_FLOAT, sizeof(float[2]), varray_texcoord[i]);CHECKGLERROR
 348                                 if (gl_state.texture[i])
 349                                 {
 350                                         qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 351                                 }
 352                                 else
 353                                 {
 354                                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 355                                 }
 356                         }
 357                 }
 358         }
 359         else
 360         {
 361                 qglBindTexture(GL_TEXTURE_2D, gl_state.texture[0]);CHECKGLERROR
 362                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 363                 if (gl_state.texture[0])
 364                 {
 365                         qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 366                 }
 367                 else
 368                 {
 369                         qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 370                 }
 371                 if (gl_mesh_drawmode.integer > 0)
 372                 {
 373                         qglTexCoordPointer(2, GL_FLOAT, sizeof(float[2]), varray_texcoord[0]);CHECKGLERROR
 374                         if (gl_state.texture[0])
 375                         {
 376                                 qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 377                         }
 378                         else
 379                         {
 380                                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 381                         }
 382                 }
 383         }
 384 }
 385
 386 int usedarrays;
 387 void GL_Backend_ResetState(void)
 388 {
 389         int i;
 390         gl_state.unit = 0;
 391         gl_state.clientunit = 0;
 392
 393         for (i = 0;i < backendunits;i++)
 394         {
 395                 gl_state.texture[i] = 0;
 396                 gl_state.texturergbscale[i] = 1;
 397         }
 398
 399         qglEnable(GL_CULL_FACE);CHECKGLERROR
 400         qglCullFace(GL_FRONT);CHECKGLERROR
 401
 402         gl_state.depthdisable = false;
 403         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 404
 405         gl_state.blendfunc1 = GL_ONE;
 406         gl_state.blendfunc2 = GL_ZERO;
 407         qglBlendFunc(gl_state.blendfunc1, gl_state.blendfunc2);CHECKGLERROR
 408
 409         gl_state.blend = 0;
 410         qglDisable(GL_BLEND);CHECKGLERROR
 411
 412         gl_state.depthmask = GL_TRUE;
 413         qglDepthMask(gl_state.depthmask);CHECKGLERROR
 414
 415         usedarrays = false;
 416         if (gl_mesh_drawmode.integer > 0)
 417         {
 418                 usedarrays = true;
 419                 qglVertexPointer(3, GL_FLOAT, sizeof(float[4]), varray_vertex);CHECKGLERROR
 420                 qglEnableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 421                 if (gl_mesh_floatcolors.integer)
 422                 {
 423                         qglColorPointer(4, GL_FLOAT, sizeof(float[4]), varray_color);CHECKGLERROR
 424                 }
 425                 else
 426                 {
 427                         qglColorPointer(4, GL_UNSIGNED_BYTE, sizeof(qbyte[4]), varray_bcolor);CHECKGLERROR
 428                 }
 429                 qglEnableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 430         }
 431
 432         GL_SetupTextureState();
 433 }
 434
 435 // called at beginning of frame
 436 void R_Mesh_Start(float farclip)
 437 {
 438         BACKENDACTIVECHECK
 439
 440         CHECKGLERROR
 441
 442         r_mesh_farclip = farclip;
 443         viewdist = DotProduct(r_origin, vpn);
 444         vpnbit0 = vpn[0] < 0;
 445         vpnbit1 = vpn[1] < 0;
 446         vpnbit2 = vpn[2] < 0;
 447
 448         c_meshs = 0;
 449         c_meshtris = 0;
 450
 451         GL_Backend_CheckCvars();
 452         if (mesh_maxtris != gl_mesh_maxtriangles.integer)
 453                 GL_Backend_ResizeArrays(gl_mesh_maxtriangles.integer);
 454
 455         GL_SetupFrame();
 456
 457         GL_Backend_ResetState();
 458 }
 459
 460 int gl_backend_rebindtextures;
 461
 462 void GL_ConvertColorsFloatToByte(int numverts)
 463 {
 464         int i, k, total;
 465         // LordHavoc: to avoid problems with aliasing (treating memory as two
 466         // different types - exactly what this is doing), these must be volatile
 467         // (or a union)
 468         volatile int *icolor;
 469         volatile float *fcolor;
 470         qbyte *bcolor;
 471
 472         total = numverts * 4;
 473
 474         // shift float to have 8bit fraction at base of number
 475         fcolor = varray_color;
 476         for (i = 0;i < total;)
 477         {
 478                 fcolor[i    ] += 32768.0f;
 479                 fcolor[i + 1] += 32768.0f;
 480                 fcolor[i + 2] += 32768.0f;
 481                 fcolor[i + 3] += 32768.0f;
 482                 i += 4;
 483         }
 484
 485         // then read as integer and kill float bits...
 486         icolor = (int *)varray_color;
 487         bcolor = varray_bcolor;
 488         for (i = 0;i < total;)
 489         {
 490                 k = icolor[i    ] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i    ] = (qbyte) k;
 491                 k = icolor[i + 1] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i + 1] = (qbyte) k;
 492                 k = icolor[i + 2] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i + 2] = (qbyte) k;
 493                 k = icolor[i + 3] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i + 3] = (qbyte) k;
 494                 i += 4;
 495         }
 496 }
 497
 498 void GL_TransformVertices(int numverts)
 499 {
 500         int i;
 501         float m[12], tempv[4], *v;
 502         m[0] = backendmatrix.m[0][0];
 503         m[1] = backendmatrix.m[0][1];
 504         m[2] = backendmatrix.m[0][2];
 505         m[3] = backendmatrix.m[0][3];
 506         m[4] = backendmatrix.m[1][0];
 507         m[5] = backendmatrix.m[1][1];
 508         m[6] = backendmatrix.m[1][2];
 509         m[7] = backendmatrix.m[1][3];
 510         m[8] = backendmatrix.m[2][0];
 511         m[9] = backendmatrix.m[2][1];
 512         m[10] = backendmatrix.m[2][2];
 513         m[11] = backendmatrix.m[2][3];
 514         for (i = 0, v = varray_vertex;i < numverts;i++, v += 4)
 515         {
 516                 VectorCopy(v, tempv);
 517                 v[0] = tempv[0] * m[0] + tempv[1] * m[1] + tempv[2] * m[2] + m[3];
 518                 v[1] = tempv[0] * m[4] + tempv[1] * m[5] + tempv[2] * m[6] + m[7];
 519                 v[2] = tempv[0] * m[8] + tempv[1] * m[9] + tempv[2] * m[10] + m[11];
 520         }
 521 }
 522
 523 void GL_DrawRangeElements(int firstvert, int endvert, int indexcount, GLuint *index)
 524 {
 525         unsigned int i, j, in;
 526         qbyte *c;
 527         float *v;
 528         GL_LockArray(firstvert, endvert - firstvert);
 529         if (gl_mesh_drawmode.integer >= 3/* && (endvert - firstvert) <= gl_maxdrawrangeelementsvertices && (indexcount) <= gl_maxdrawrangeelementsindices*/)
 530         {
 531                 // GL 1.2 or GL 1.1 with extension
 532                 qglDrawRangeElements(GL_TRIANGLES, firstvert, endvert, indexcount, GL_UNSIGNED_INT, index);
 533                 CHECKGLERROR
 534         }
 535         else if (gl_mesh_drawmode.integer >= 2)
 536         {
 537                 // GL 1.1
 538                 qglDrawElements(GL_TRIANGLES, indexcount, GL_UNSIGNED_INT, index);
 539                 CHECKGLERROR
 540         }
 541         else if (gl_mesh_drawmode.integer >= 1)
 542         {
 543                 // GL 1.1
 544                 // feed it manually using glArrayElement
 545                 qglBegin(GL_TRIANGLES);
 546                 for (i = 0;i < indexcount;i++)
 547                         qglArrayElement(index[i]);
 548                 qglEnd();
 549                 CHECKGLERROR
 550         }
 551         else
 552         {
 553                 // GL 1.1 but not using vertex arrays - 3dfx glquake minigl driver
 554                 // feed it manually
 555                 qglBegin(GL_TRIANGLES);
 556                 if (gl_state.texture[1]) // if the mesh uses multiple textures
 557                 {
 558                         // the minigl doesn't have this (because it does not have ARB_multitexture)
 559                         for (i = 0;i < indexcount;i++)
 560                         {
 561                                 in = index[i];
 562                                 c = varray_bcolor + in * 4;
 563                                 qglColor4ub(c[0], c[1], c[2], c[3]);
 564                                 for (j = 0;j < backendunits;j++)
 565                                 {
 566                                         if (gl_state.texture[j])
 567                                         {
 568                                                 v = varray_texcoord[j] + in * 2;
 569                                                 qglMultiTexCoord2f(GL_TEXTURE0_ARB + j, v[0], v[1]);
 570                                         }
 571                                 }
 572                                 v = varray_vertex + in * 4;
 573                                 qglVertex3f(v[0], v[1], v[2]);
 574                         }
 575                 }
 576                 else
 577                 {
 578                         for (i = 0;i < indexcount;i++)
 579                         {
 580                                 in = index[i];
 581                                 c = varray_bcolor + in * 4;
 582                                 qglColor4ub(c[0], c[1], c[2], c[3]);
 583                                 if (gl_state.texture[0])
 584                                 {
 585                                         v = varray_texcoord[j] + in * 2;
 586                                         qglTexCoord2f(v[0], v[1]);
 587                                 }
 588                                 v = varray_vertex + in * 4;
 589                                 qglVertex3f(v[0], v[1], v[2]);
 590                         }
 591                 }
 592                 qglEnd();
 593                 CHECKGLERROR
 594         }
 595         GL_UnlockArray();
 596 }
 597
 598 // enlarges geometry buffers if they are too small
 599 void _R_Mesh_ResizeCheck(int numverts, int numtriangles)
 600 {
 601         if (numtriangles > mesh_maxtris || numverts > mesh_maxverts)
 602         {
 603                 BACKENDACTIVECHECK
 604                 GL_Backend_ResizeArrays(max(numtriangles, (numverts + 2) / 3) + 100);
 605                 GL_Backend_ResetState();
 606         }
 607 }
 608
 609 // renders the mesh
 610 void R_Mesh_Draw(int numverts, int numtriangles)
 611 {
 612         BACKENDACTIVECHECK
 613
 614         c_meshs++;
 615         c_meshtris += numtriangles;
 616
 617         CHECKGLERROR
 618
 619         // drawmode 0 always uses byte colors
 620         if (!gl_mesh_floatcolors.integer || gl_mesh_drawmode.integer <= 0)
 621                 GL_ConvertColorsFloatToByte(numverts);
 622         GL_TransformVertices(numverts);
 623         if (!r_render.integer)
 624                 return;
 625         GL_DrawRangeElements(0, numverts, numtriangles * 3, varray_element);
 626 }
 627
 628 // restores backend state, used when done with 3D rendering
 629 void R_Mesh_Finish(void)
 630 {
 631         int i;
 632         BACKENDACTIVECHECK
 633
 634         if (backendunits > 1)
 635         {
 636                 for (i = backendunits - 1;i >= 0;i--)
 637                 {
 638                         qglActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
 639                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 640                         if (gl_combine.integer)
 641                         {
 642                                 qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
 643                         }
 644                         if (i > 0)
 645                         {
 646                                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 647                         }
 648                         else
 649                         {
 650                                 qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 651                         }
 652                         qglBindTexture(GL_TEXTURE_2D, 0);CHECKGLERROR
 653
 654                         if (usedarrays)
 655                         {
 656                                 qglClientActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
 657                                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 658                         }
 659                 }
 660         }
 661         else
 662         {
 663                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 664                 qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 665                 if (usedarrays)
 666                 {
 667                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 668                 }
 669         }
 670         if (usedarrays)
 671         {
 672                 qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 673                 qglDisableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 674         }
 675
 676         qglDisable(GL_BLEND);CHECKGLERROR
 677         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 678         qglDepthMask(GL_TRUE);CHECKGLERROR
 679         qglBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);CHECKGLERROR
 680 }
 681
 682 void R_Mesh_ClearDepth(void)
 683 {
 684         BACKENDACTIVECHECK
 685
 686         R_Mesh_Finish();
 687         qglClear(GL_DEPTH_BUFFER_BIT);
 688         R_Mesh_Start(r_mesh_farclip);
 689 }
 690
 691 // sets up the requested state
 692 void R_Mesh_State(const rmeshstate_t *m)
 693 {
 694         int i, overbright;
 695         int texturergbscale[MAX_TEXTUREUNITS];
 696         float scaler;
 697
 698         BACKENDACTIVECHECK
 699
 700         if (gl_backend_rebindtextures)
 701         {
 702                 gl_backend_rebindtextures = false;
 703                 GL_SetupTextureState();
 704         }
 705
 706         backendmatrix = m->matrix; // this copies the struct
 707
 708         overbright = false;
 709         scaler = 1;
 710         if (m->blendfunc1 == GL_DST_COLOR)
 711         {
 712                 // check if it is a 2x modulate with framebuffer
 713                 if (m->blendfunc2 == GL_SRC_COLOR)
 714                         scaler *= 0.5f;
 715         }
 716         else if (m->blendfunc2 != GL_SRC_COLOR)
 717         {
 718                 if (m->tex[0])
 719                 {
 720                         overbright = m->wantoverbright && gl_combine.integer;
 721                         if (overbright)
 722                                 scaler *= 0.25f;
 723                 }
 724                 scaler *= overbrightscale;
 725         }
 726         mesh_colorscale = scaler;
 727
 728         if (gl_state.blendfunc1 != m->blendfunc1 || gl_state.blendfunc2 != m->blendfunc2)
 729         {
 730                 qglBlendFunc(gl_state.blendfunc1 = m->blendfunc1, gl_state.blendfunc2 = m->blendfunc2);CHECKGLERROR
 731                 if (gl_state.blendfunc2 == GL_ZERO)
 732                 {
 733                         if (gl_state.blendfunc1 == GL_ONE)
 734                         {
 735                                 if (gl_state.blend)
 736                                 {
 737                                         gl_state.blend = 0;
 738                                         qglDisable(GL_BLEND);CHECKGLERROR
 739                                 }
 740                         }
 741                         else
 742                         {
 743                                 if (!gl_state.blend)
 744                                 {
 745                                         gl_state.blend = 1;
 746                                         qglEnable(GL_BLEND);CHECKGLERROR
 747                                 }
 748                         }
 749                 }
 750                 else
 751                 {
 752                         if (!gl_state.blend)
 753                         {
 754                                 gl_state.blend = 1;
 755                                 qglEnable(GL_BLEND);CHECKGLERROR
 756                         }
 757                 }
 758         }
 759         if (gl_state.depthdisable != m->depthdisable)
 760         {
 761                 gl_state.depthdisable = m->depthdisable;
 762                 if (gl_state.depthdisable)
 763                         qglDisable(GL_DEPTH_TEST);
 764                 else
 765                         qglEnable(GL_DEPTH_TEST);
 766         }
 767         if (gl_state.depthmask != (m->blendfunc2 == GL_ZERO || m->depthwrite))
 768         {
 769                 qglDepthMask(gl_state.depthmask = (m->blendfunc2 == GL_ZERO || m->depthwrite));CHECKGLERROR
 770         }
 771
 772         for (i = 0;i < backendunits;i++)
 773         {
 774                 if (m->texrgbscale[i])
 775                         texturergbscale[i] = m->texrgbscale[i];
 776                 else
 777                         texturergbscale[i] = 1;
 778         }
 779         if (overbright)
 780                 for (i = backendunits - 1;i >= 0;i--)
 781                         if (m->tex[i])
 782                                 texturergbscale[i] = 4;
 783
 784         if (backendunits > 1)
 785         {
 786                 for (i = 0;i < backendunits;i++)
 787                 {
 788                         if (gl_state.texture[i] != m->tex[i])
 789                         {
 790                                 if (gl_state.unit != i)
 791                                 {
 792                                         qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 793                                 }
 794                                 if (gl_state.texture[i] == 0)
 795                                 {
 796                                         qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 797                                         if (gl_state.clientunit != i)
 798                                         {
 799                                                 qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 800                                         }
 801                                         qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 802                                 }
 803                                 qglBindTexture(GL_TEXTURE_2D, (gl_state.texture[i] = m->tex[i]));CHECKGLERROR
 804                                 if (gl_state.texture[i] == 0)
 805                                 {
 806                                         qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 807                                         if (gl_state.clientunit != i)
 808                                         {
 809                                                 qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 810                                         }
 811                                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 812                                 }
 813                         }
 814                         if (gl_state.texturergbscale[i] != texturergbscale[i])
 815                         {
 816                                 if (gl_state.unit != i)
 817                                 {
 818                                         qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 819                                 }
 820                                 qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, (gl_state.texturergbscale[i] = texturergbscale[i]));CHECKGLERROR
 821                         }
 822                 }
 823         }
 824         else
 825         {
 826                 if (gl_state.texture[0] != m->tex[0])
 827                 {
 828                         if (gl_state.texture[0] == 0)
 829                         {
 830                                 qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 831                                 qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 832                         }
 833                         qglBindTexture(GL_TEXTURE_2D, (gl_state.texture[0] = m->tex[0]));CHECKGLERROR
 834                         if (gl_state.texture[0] == 0)
 835                         {
 836                                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 837                                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 838                         }
 839                 }
 840         }
 841 }
 842
 843 /*
 844 ==============================================================================
 845
 846                                                 SCREEN SHOTS
 847
 848 ==============================================================================
 849 */
 850
 851 qboolean SCR_ScreenShot(char *filename, int x, int y, int width, int height)
 852 {
 853         qboolean ret;
 854         int i;
 855         qbyte *buffer;
 856
 857         if (!r_render.integer)
 858                 return false;
 859
 860         buffer = Mem_Alloc(tempmempool, width*height*3);
 861         qglReadPixels (x, y, width, height, GL_RGB, GL_UNSIGNED_BYTE, buffer);
 862         CHECKGLERROR
 863
 864         // LordHavoc: compensate for v_overbrightbits when using hardware gamma
 865         if (v_hwgamma.integer)
 866                 for (i = 0;i < width * height * 3;i++)
 867                         buffer[i] <<= v_overbrightbits.integer;
 868
 869         ret = Image_WriteTGARGB_preflipped(filename, width, height, buffer);
 870
 871         Mem_Free(buffer);
 872         return ret;
 873 }
 874
 875 //=============================================================================
 876
 877 void R_ClearScreen(void)
 878 {
 879         if (r_render.integer)
 880         {
 881                 // clear to black
 882                 qglClearColor(0,0,0,0);CHECKGLERROR
 883                 // clear the screen
 884                 qglClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);CHECKGLERROR
 885                 // set dithering mode
 886                 if (gl_dither.integer)
 887                 {
 888                         qglEnable(GL_DITHER);CHECKGLERROR
 889                 }
 890                 else
 891                 {
 892                         qglDisable(GL_DITHER);CHECKGLERROR
 893                 }
 894         }
 895 }
 896
 897 /*
 898 ==================
 899 SCR_UpdateScreen
 900
 901 This is called every frame, and can also be called explicitly to flush
 902 text to the screen.
 903 ==================
 904 */
 905 void SCR_UpdateScreen (void)
 906 {
 907         VID_Finish ();
 908
 909         R_TimeReport("finish");
 910
 911         if (r_textureunits.integer > gl_textureunits)
 912                 Cvar_SetValueQuick(&r_textureunits, gl_textureunits);
 913         if (r_textureunits.integer < 1)
 914                 Cvar_SetValueQuick(&r_textureunits, 1);
 915
 916         if (gl_combine.integer && (!gl_combine_extension || r_textureunits.integer < 2))
 917                 Cvar_SetValueQuick(&gl_combine, 0);
 918
 919         // lighting scale
 920         overbrightscale = 1.0f / (float) (1 << v_overbrightbits.integer);
 921
 922         // lightmaps only
 923         lightscalebit = v_overbrightbits.integer;
 924         if (gl_combine.integer && r_textureunits.integer > 1)
 925                 lightscalebit += 2;
 926         lightscale = 1.0f / (float) (1 << lightscalebit);
 927
 928         R_TimeReport("setup");
 929
 930         R_ClearScreen();
 931
 932         R_TimeReport("clear");
 933
 934         if (scr_conlines < vid.conheight && cls.signon == SIGNONS)
 935                 R_RenderView();
 936
 937         // draw 2D stuff
 938         R_DrawQueue();
 939
 940         // tell driver to commit it's partially full geometry queue to the rendering queue
 941         // (this doesn't wait for the commands themselves to complete)
 942         qglFlush();
 943 }
 944