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