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 int lightscalebit;
  69 float lightscale;
  70 float overbrightscale;
  71
  72 void SCR_ScreenShot_f (void);
  73
  74 // these are externally accessible
  75 float mesh_colorscale;
  76 float *varray_vertex;
  77 float *varray_color;
  78 float *varray_texcoord[MAX_TEXTUREUNITS];
  79 int mesh_maxverts;
  80
  81 static matrix4x4_t backend_viewmatrix;
  82 static matrix4x4_t backend_modelmatrix;
  83 static matrix4x4_t backend_modelviewmatrix;
  84 static matrix4x4_t backend_glmodelviewmatrix;
  85
  86 static int backendunits, backendactive;
  87 static qbyte *varray_bcolor;
  88 static mempool_t *gl_backend_mempool;
  89
  90 int polygonelements[768];
  91
  92 void GL_Backend_AllocArrays(void)
  93 {
  94         int i;
  95
  96         for (i = 0;i < POLYGONELEMENTS_MAXPOINTS - 2;i++)
  97         {
  98                 polygonelements[i * 3 + 0] = 0;
  99                 polygonelements[i * 3 + 1] = i + 1;
 100                 polygonelements[i * 3 + 2] = i + 2;
 101         }
 102
 103         if (!gl_backend_mempool)
 104                 gl_backend_mempool = Mem_AllocPool("GL_Backend");
 105
 106         varray_vertex = Mem_Alloc(gl_backend_mempool, mesh_maxverts * sizeof(float[4]));
 107         varray_color = Mem_Alloc(gl_backend_mempool, mesh_maxverts * sizeof(float[4]));
 108         varray_bcolor = Mem_Alloc(gl_backend_mempool, mesh_maxverts * sizeof(qbyte[4]));
 109         for (i = 0;i < backendunits;i++)
 110                 varray_texcoord[i] = Mem_Alloc(gl_backend_mempool, mesh_maxverts * sizeof(float[2]));
 111         for (;i < MAX_TEXTUREUNITS;i++)
 112                 varray_texcoord[i] = NULL;
 113 }
 114
 115 void GL_Backend_FreeArrays(int resizingbuffers)
 116 {
 117         int i;
 118         if (resizingbuffers)
 119                 Mem_EmptyPool(gl_backend_mempool);
 120         else
 121                 Mem_FreePool(&gl_backend_mempool);
 122         varray_vertex = NULL;
 123         varray_color = NULL;
 124         varray_bcolor = NULL;
 125         for (i = 0;i < MAX_TEXTUREUNITS;i++)
 126                 varray_texcoord[i] = NULL;
 127 }
 128
 129 static void gl_backend_start(void)
 130 {
 131         Con_Printf("OpenGL Backend started with gl_mesh_maxverts %i\n", gl_mesh_maxverts.integer);
 132         if (qglDrawRangeElements != NULL)
 133         {
 134                 qglGetIntegerv(GL_MAX_ELEMENTS_VERTICES, &gl_maxdrawrangeelementsvertices);
 135                 qglGetIntegerv(GL_MAX_ELEMENTS_INDICES, &gl_maxdrawrangeelementsindices);
 136                 CHECKGLERROR
 137                 Con_Printf("glDrawRangeElements detected (max vertices %i, max indices %i)\n", gl_maxdrawrangeelementsvertices, gl_maxdrawrangeelementsindices);
 138         }
 139         if (strstr(gl_renderer, "3Dfx"))
 140         {
 141                 Con_Printf("3Dfx driver detected, forcing gl_mesh_floatcolors to 0 to prevent crashs\n");
 142                 Cvar_SetValueQuick(&gl_mesh_floatcolors, 0);
 143         }
 144
 145         backendunits = min(MAX_TEXTUREUNITS, gl_textureunits);
 146
 147         GL_Backend_AllocArrays();
 148
 149         backendactive = true;
 150 }
 151
 152 static void gl_backend_shutdown(void)
 153 {
 154         backendunits = 0;
 155         backendactive = false;
 156
 157         Con_Printf("OpenGL Backend shutting down\n");
 158
 159         GL_Backend_FreeArrays(false);
 160 }
 161
 162 void GL_Backend_CheckCvars(void)
 163 {
 164         // 21760 is (65536 / 3) rounded off to a multiple of 128
 165         if (gl_mesh_maxverts.integer < 1024)
 166                 Cvar_SetValueQuick(&gl_mesh_maxverts, 1024);
 167         if (gl_mesh_maxverts.integer > 21760)
 168                 Cvar_SetValueQuick(&gl_mesh_maxverts, 21760);
 169 }
 170
 171 void GL_Backend_ResizeArrays(int numtriangles)
 172 {
 173         Cvar_SetValueQuick(&gl_mesh_maxverts, numtriangles);
 174         GL_Backend_CheckCvars();
 175         mesh_maxverts = gl_mesh_maxverts.integer;
 176         GL_Backend_FreeArrays(true);
 177         GL_Backend_AllocArrays();
 178 }
 179
 180 static void gl_backend_newmap(void)
 181 {
 182 }
 183
 184 void gl_backend_init(void)
 185 {
 186         Cvar_RegisterVariable(&r_render);
 187         Cvar_RegisterVariable(&gl_dither);
 188         Cvar_RegisterVariable(&gl_lockarrays);
 189 #ifdef NORENDER
 190         Cvar_SetValue("r_render", 0);
 191 #endif
 192
 193         Cvar_RegisterVariable(&gl_mesh_maxverts);
 194         Cvar_RegisterVariable(&gl_mesh_floatcolors);
 195         Cvar_RegisterVariable(&gl_mesh_drawrangeelements);
 196         GL_Backend_CheckCvars();
 197         R_RegisterModule("GL_Backend", gl_backend_start, gl_backend_shutdown, gl_backend_newmap);
 198 }
 199
 200 void GL_SetupView_ViewPort (int x, int y, int width, int height)
 201 {
 202         if (!r_render.integer)
 203                 return;
 204
 205         // y is weird beause OpenGL is bottom to top, we use top to bottom
 206         qglViewport(x, vid.realheight - (y + height), width, height);
 207         CHECKGLERROR
 208 }
 209
 210 void GL_SetupView_Orientation_Identity (void)
 211 {
 212         Matrix4x4_CreateIdentity(&backend_viewmatrix);
 213         memset(&backend_modelmatrix, 0, sizeof(backend_modelmatrix));
 214 }
 215
 216 void GL_SetupView_Orientation_FromEntity (vec3_t origin, vec3_t angles)
 217 {
 218         Matrix4x4_CreateRotate(&backend_viewmatrix, -90, 1, 0, 0);
 219         Matrix4x4_ConcatRotate(&backend_viewmatrix, 90, 0, 0, 1);
 220         Matrix4x4_ConcatRotate(&backend_viewmatrix, -angles[2], 1, 0, 0);
 221         Matrix4x4_ConcatRotate(&backend_viewmatrix, -angles[0], 0, 1, 0);
 222         Matrix4x4_ConcatRotate(&backend_viewmatrix, -angles[1], 0, 0, 1);
 223         Matrix4x4_ConcatTranslate(&backend_viewmatrix, -origin[0], -origin[1], -origin[2]);
 224         memset(&backend_modelmatrix, 0, sizeof(backend_modelmatrix));
 225 }
 226
 227 void GL_SetupView_Mode_Perspective (double aspect, double fovx, double fovy, double zNear, double zFar)
 228 {
 229         double xmax, ymax;
 230
 231         if (!r_render.integer)
 232                 return;
 233
 234         // set up viewpoint
 235         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 236         qglLoadIdentity ();CHECKGLERROR
 237         // pyramid slopes
 238         xmax = zNear * tan(fovx * M_PI / 360.0);
 239         ymax = zNear * tan(fovy * M_PI / 360.0);
 240         // set view pyramid
 241         qglFrustum(-xmax, xmax, -ymax, ymax, zNear, zFar);CHECKGLERROR
 242         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 243         GL_SetupView_Orientation_Identity();
 244 }
 245
 246 void GL_SetupView_Mode_Ortho (double x1, double y1, double x2, double y2, double zNear, double zFar)
 247 {
 248         if (!r_render.integer)
 249                 return;
 250
 251         // set up viewpoint
 252         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 253         qglLoadIdentity ();CHECKGLERROR
 254         qglOrtho(x1, y2, x2, y1, zNear, zFar);
 255         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 256         GL_SetupView_Orientation_Identity();
 257 }
 258
 259 static struct
 260 {
 261         int blendfunc1;
 262         int blendfunc2;
 263         int blend;
 264         GLboolean depthmask;
 265         int depthdisable;
 266         int unit;
 267         int clientunit;
 268         int texture[MAX_TEXTUREUNITS];
 269         float texturergbscale[MAX_TEXTUREUNITS];
 270 }
 271 gl_state;
 272
 273 void GL_SetupTextureState(void)
 274 {
 275         int i;
 276         if (backendunits > 1)
 277         {
 278                 for (i = 0;i < backendunits;i++)
 279                 {
 280                         qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 281                         qglBindTexture(GL_TEXTURE_2D, gl_state.texture[i]);CHECKGLERROR
 282                         if (gl_combine.integer)
 283                         {
 284                                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);CHECKGLERROR
 285                                 qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_MODULATE);CHECKGLERROR
 286                                 qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE);CHECKGLERROR
 287                                 qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 288                                 qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_RGB_ARB, GL_CONSTANT_ARB);CHECKGLERROR
 289                                 qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 290                                 qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 291                                 qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_RGB_ARB, GL_SRC_ALPHA);CHECKGLERROR
 292                                 qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, GL_MODULATE);CHECKGLERROR
 293                                 qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA_ARB, GL_TEXTURE);CHECKGLERROR
 294                                 qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_ALPHA_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 295                                 qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_ALPHA_ARB, GL_CONSTANT_ARB);CHECKGLERROR
 296                                 qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 297                                 qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 298                                 qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 299                                 qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, gl_state.texturergbscale[i]);CHECKGLERROR
 300                                 qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
 301                         }
 302                         else
 303                         {
 304                                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 305                         }
 306                         if (gl_state.texture[i])
 307                         {
 308                                 qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 309                         }
 310                         else
 311                         {
 312                                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 313                         }
 314                         qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 315                         qglTexCoordPointer(2, GL_FLOAT, sizeof(float[2]), varray_texcoord[i]);CHECKGLERROR
 316                         if (gl_state.texture[i])
 317                         {
 318                                 qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 319                         }
 320                         else
 321                         {
 322                                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 323                         }
 324                 }
 325         }
 326         else
 327         {
 328                 qglBindTexture(GL_TEXTURE_2D, gl_state.texture[0]);CHECKGLERROR
 329                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 330                 if (gl_state.texture[0])
 331                 {
 332                         qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 333                 }
 334                 else
 335                 {
 336                         qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 337                 }
 338                 qglTexCoordPointer(2, GL_FLOAT, sizeof(float[2]), varray_texcoord[0]);CHECKGLERROR
 339                 if (gl_state.texture[0])
 340                 {
 341                         qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 342                 }
 343                 else
 344                 {
 345                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 346                 }
 347         }
 348 }
 349
 350 int usedarrays;
 351 void GL_Backend_ResetState(void)
 352 {
 353         int i;
 354         gl_state.unit = 0;
 355         gl_state.clientunit = 0;
 356
 357         for (i = 0;i < backendunits;i++)
 358         {
 359                 gl_state.texture[i] = 0;
 360                 gl_state.texturergbscale[i] = 1;
 361         }
 362
 363         qglEnable(GL_CULL_FACE);CHECKGLERROR
 364         qglCullFace(GL_FRONT);CHECKGLERROR
 365
 366         gl_state.depthdisable = false;
 367         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 368
 369         gl_state.blendfunc1 = GL_ONE;
 370         gl_state.blendfunc2 = GL_ZERO;
 371         qglBlendFunc(gl_state.blendfunc1, gl_state.blendfunc2);CHECKGLERROR
 372
 373         gl_state.blend = 0;
 374         qglDisable(GL_BLEND);CHECKGLERROR
 375
 376         gl_state.depthmask = GL_TRUE;
 377         qglDepthMask(gl_state.depthmask);CHECKGLERROR
 378
 379         usedarrays = false;
 380         usedarrays = true;
 381         qglVertexPointer(3, GL_FLOAT, sizeof(float[4]), varray_vertex);CHECKGLERROR
 382         qglEnableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 383         if (gl_mesh_floatcolors.integer)
 384         {
 385                 qglColorPointer(4, GL_FLOAT, sizeof(float[4]), varray_color);CHECKGLERROR
 386         }
 387         else
 388         {
 389                 qglColorPointer(4, GL_UNSIGNED_BYTE, sizeof(qbyte[4]), varray_bcolor);CHECKGLERROR
 390         }
 391         qglEnableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 392
 393         GL_SetupTextureState();
 394 }
 395
 396 // called at beginning of frame
 397 void R_Mesh_Start(void)
 398 {
 399         BACKENDACTIVECHECK
 400
 401         CHECKGLERROR
 402
 403         GL_Backend_CheckCvars();
 404         if (mesh_maxverts != gl_mesh_maxverts.integer)
 405                 GL_Backend_ResizeArrays(gl_mesh_maxverts.integer);
 406
 407         GL_Backend_ResetState();
 408 }
 409
 410 int gl_backend_rebindtextures;
 411
 412 void GL_ConvertColorsFloatToByte(int numverts)
 413 {
 414         int i, k, total;
 415         // LordHavoc: to avoid problems with aliasing (treating memory as two
 416         // different types - exactly what this is doing), these must be volatile
 417         // (or a union)
 418         volatile int *icolor;
 419         volatile float *fcolor;
 420         qbyte *bcolor;
 421
 422         total = numverts * 4;
 423
 424         // shift float to have 8bit fraction at base of number
 425         fcolor = varray_color;
 426         for (i = 0;i < total;)
 427         {
 428                 fcolor[i    ] += 32768.0f;
 429                 fcolor[i + 1] += 32768.0f;
 430                 fcolor[i + 2] += 32768.0f;
 431                 fcolor[i + 3] += 32768.0f;
 432                 i += 4;
 433         }
 434
 435         // then read as integer and kill float bits...
 436         icolor = (int *)varray_color;
 437         bcolor = varray_bcolor;
 438         for (i = 0;i < total;)
 439         {
 440                 k = icolor[i    ] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i    ] = (qbyte) k;
 441                 k = icolor[i + 1] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i + 1] = (qbyte) k;
 442                 k = icolor[i + 2] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i + 2] = (qbyte) k;
 443                 k = icolor[i + 3] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i + 3] = (qbyte) k;
 444                 i += 4;
 445         }
 446 }
 447
 448 /*
 449 void GL_TransformVertices(int numverts)
 450 {
 451         int i;
 452         float m[12], tempv[4], *v;
 453         m[0] = backendmatrix.m[0][0];
 454         m[1] = backendmatrix.m[0][1];
 455         m[2] = backendmatrix.m[0][2];
 456         m[3] = backendmatrix.m[0][3];
 457         m[4] = backendmatrix.m[1][0];
 458         m[5] = backendmatrix.m[1][1];
 459         m[6] = backendmatrix.m[1][2];
 460         m[7] = backendmatrix.m[1][3];
 461         m[8] = backendmatrix.m[2][0];
 462         m[9] = backendmatrix.m[2][1];
 463         m[10] = backendmatrix.m[2][2];
 464         m[11] = backendmatrix.m[2][3];
 465         for (i = 0, v = varray_vertex;i < numverts;i++, v += 4)
 466         {
 467                 VectorCopy(v, tempv);
 468                 v[0] = tempv[0] * m[0] + tempv[1] * m[1] + tempv[2] * m[2] + m[3];
 469                 v[1] = tempv[0] * m[4] + tempv[1] * m[5] + tempv[2] * m[6] + m[7];
 470                 v[2] = tempv[0] * m[8] + tempv[1] * m[9] + tempv[2] * m[10] + m[11];
 471         }
 472 }
 473 */
 474
 475 void GL_DrawRangeElements(int firstvert, int endvert, int indexcount, int *index)
 476 {
 477         int arraylocked = false;
 478         c_meshs++;
 479         c_meshelements += indexcount;
 480         if (gl_supportslockarrays && gl_lockarrays.integer)
 481         {
 482                 qglLockArraysEXT(firstvert, endvert - firstvert);
 483                 CHECKGLERROR
 484                 arraylocked = true;
 485         }
 486         if (gl_mesh_drawrangeelements.integer && qglDrawRangeElements != NULL)
 487                 qglDrawRangeElements(GL_TRIANGLES, firstvert, endvert, indexcount, GL_UNSIGNED_INT, (GLuint *) index);
 488         else
 489                 qglDrawElements(GL_TRIANGLES, indexcount, GL_UNSIGNED_INT, (GLuint *) index);
 490         CHECKGLERROR
 491         if (arraylocked)
 492         {
 493                 qglUnlockArraysEXT();
 494                 CHECKGLERROR
 495                 arraylocked = false;
 496         }
 497 }
 498
 499 // enlarges geometry buffers if they are too small
 500 void _R_Mesh_ResizeCheck(int numverts)
 501 {
 502         if (numverts > mesh_maxverts)
 503         {
 504                 BACKENDACTIVECHECK
 505                 GL_Backend_ResizeArrays(numverts + 100);
 506                 GL_Backend_ResetState();
 507         }
 508 }
 509
 510 // renders the mesh
 511 void R_Mesh_Draw(int numverts, int numtriangles, int *elements)
 512 {
 513         BACKENDACTIVECHECK
 514
 515         CHECKGLERROR
 516
 517         if (!gl_mesh_floatcolors.integer)
 518                 GL_ConvertColorsFloatToByte(numverts);
 519         //GL_TransformVertices(numverts);
 520         if (!r_render.integer)
 521                 return;
 522         GL_DrawRangeElements(0, numverts, numtriangles * 3, elements);
 523 }
 524
 525 // restores backend state, used when done with 3D rendering
 526 void R_Mesh_Finish(void)
 527 {
 528         int i;
 529         BACKENDACTIVECHECK
 530
 531         if (backendunits > 1)
 532         {
 533                 for (i = backendunits - 1;i >= 0;i--)
 534                 {
 535                         qglActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
 536                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 537                         if (gl_combine.integer)
 538                         {
 539                                 qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
 540                         }
 541                         if (i > 0)
 542                         {
 543                                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 544                         }
 545                         else
 546                         {
 547                                 qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 548                         }
 549                         qglBindTexture(GL_TEXTURE_2D, 0);CHECKGLERROR
 550
 551                         if (usedarrays)
 552                         {
 553                                 qglClientActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
 554                                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 555                         }
 556                 }
 557         }
 558         else
 559         {
 560                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 561                 qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 562                 if (usedarrays)
 563                 {
 564                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 565                 }
 566         }
 567         if (usedarrays)
 568         {
 569                 qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 570                 qglDisableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 571         }
 572
 573         qglDisable(GL_BLEND);CHECKGLERROR
 574         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 575         qglDepthMask(GL_TRUE);CHECKGLERROR
 576         qglBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);CHECKGLERROR
 577 }
 578
 579 void GL_DepthFunc(int value)
 580 {
 581         if (!r_render.integer)
 582                 return;
 583
 584         qglDepthFunc (value);
 585         CHECKGLERROR
 586 }
 587
 588 void GL_ClearDepth(void)
 589 {
 590         BACKENDACTIVECHECK
 591
 592         if (!r_render.integer)
 593                 return;
 594
 595         qglClear(GL_DEPTH_BUFFER_BIT);
 596         CHECKGLERROR
 597 }
 598
 599 void R_Mesh_Matrix(const matrix4x4_t *matrix)
 600 {
 601         if (memcmp(matrix, &backend_modelmatrix, sizeof(matrix4x4_t)))
 602         {
 603                 backend_modelmatrix = *matrix;
 604                 Matrix4x4_Concat(&backend_modelviewmatrix, &backend_viewmatrix, matrix);
 605                 Matrix4x4_Transpose(&backend_glmodelviewmatrix, &backend_modelviewmatrix);
 606                 qglLoadMatrixf(&backend_glmodelviewmatrix.m[0][0]);
 607         }
 608 }
 609
 610 // sets up the requested state
 611 void R_Mesh_State(const rmeshstate_t *m)
 612 {
 613         int i, overbright;
 614         int texturergbscale[MAX_TEXTUREUNITS];
 615         float scaler;
 616
 617         BACKENDACTIVECHECK
 618
 619         if (gl_backend_rebindtextures)
 620         {
 621                 gl_backend_rebindtextures = false;
 622                 GL_SetupTextureState();
 623         }
 624
 625         overbright = false;
 626         scaler = 1;
 627         if (m->blendfunc1 == GL_DST_COLOR)
 628         {
 629                 // check if it is a 2x modulate with framebuffer
 630                 if (m->blendfunc2 == GL_SRC_COLOR)
 631                         scaler *= 0.5f;
 632         }
 633         else if (m->blendfunc2 != GL_SRC_COLOR)
 634         {
 635                 if (m->tex[0])
 636                 {
 637                         overbright = m->wantoverbright && gl_combine.integer;
 638                         if (overbright)
 639                                 scaler *= 0.25f;
 640                 }
 641                 scaler *= overbrightscale;
 642         }
 643         mesh_colorscale = scaler;
 644
 645         if (gl_state.blendfunc1 != m->blendfunc1 || gl_state.blendfunc2 != m->blendfunc2)
 646         {
 647                 qglBlendFunc(gl_state.blendfunc1 = m->blendfunc1, gl_state.blendfunc2 = m->blendfunc2);CHECKGLERROR
 648                 if (gl_state.blendfunc2 == GL_ZERO)
 649                 {
 650                         if (gl_state.blendfunc1 == GL_ONE)
 651                         {
 652                                 if (gl_state.blend)
 653                                 {
 654                                         gl_state.blend = 0;
 655                                         qglDisable(GL_BLEND);CHECKGLERROR
 656                                 }
 657                         }
 658                         else
 659                         {
 660                                 if (!gl_state.blend)
 661                                 {
 662                                         gl_state.blend = 1;
 663                                         qglEnable(GL_BLEND);CHECKGLERROR
 664                                 }
 665                         }
 666                 }
 667                 else
 668                 {
 669                         if (!gl_state.blend)
 670                         {
 671                                 gl_state.blend = 1;
 672                                 qglEnable(GL_BLEND);CHECKGLERROR
 673                         }
 674                 }
 675         }
 676         if (gl_state.depthdisable != m->depthdisable)
 677         {
 678                 gl_state.depthdisable = m->depthdisable;
 679                 if (gl_state.depthdisable)
 680                         qglDisable(GL_DEPTH_TEST);
 681                 else
 682                         qglEnable(GL_DEPTH_TEST);
 683         }
 684         if (gl_state.depthmask != (m->blendfunc2 == GL_ZERO || m->depthwrite))
 685         {
 686                 qglDepthMask(gl_state.depthmask = (m->blendfunc2 == GL_ZERO || m->depthwrite));CHECKGLERROR
 687         }
 688
 689         for (i = 0;i < backendunits;i++)
 690         {
 691                 if (m->texrgbscale[i])
 692                         texturergbscale[i] = m->texrgbscale[i];
 693                 else
 694                         texturergbscale[i] = 1;
 695         }
 696         if (overbright)
 697         {
 698                 for (i = backendunits - 1;i >= 0;i--)
 699                 {
 700                         if (m->tex[i])
 701                         {
 702                                 texturergbscale[i] = 4;
 703                                 break;
 704                         }
 705                 }
 706         }
 707
 708         if (backendunits > 1)
 709         {
 710                 for (i = 0;i < backendunits;i++)
 711                 {
 712                         if (gl_state.texture[i] != m->tex[i])
 713                         {
 714                                 if (gl_state.unit != i)
 715                                 {
 716                                         qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 717                                 }
 718                                 if (gl_state.texture[i] == 0)
 719                                 {
 720                                         qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 721                                         if (gl_state.clientunit != i)
 722                                         {
 723                                                 qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 724                                         }
 725                                         qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 726                                 }
 727                                 qglBindTexture(GL_TEXTURE_2D, (gl_state.texture[i] = m->tex[i]));CHECKGLERROR
 728                                 if (gl_state.texture[i] == 0)
 729                                 {
 730                                         qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 731                                         if (gl_state.clientunit != i)
 732                                         {
 733                                                 qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 734                                         }
 735                                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 736                                 }
 737                         }
 738                         if (gl_state.texturergbscale[i] != texturergbscale[i])
 739                         {
 740                                 if (gl_state.unit != i)
 741                                 {
 742                                         qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 743                                 }
 744                                 qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, (gl_state.texturergbscale[i] = texturergbscale[i]));CHECKGLERROR
 745                         }
 746                 }
 747         }
 748         else
 749         {
 750                 if (gl_state.texture[0] != m->tex[0])
 751                 {
 752                         if (gl_state.texture[0] == 0)
 753                         {
 754                                 qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 755                                 qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 756                         }
 757                         qglBindTexture(GL_TEXTURE_2D, (gl_state.texture[0] = m->tex[0]));CHECKGLERROR
 758                         if (gl_state.texture[0] == 0)
 759                         {
 760                                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 761                                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 762                         }
 763                 }
 764         }
 765 }
 766
 767 /*
 768 ==============================================================================
 769
 770                                                 SCREEN SHOTS
 771
 772 ==============================================================================
 773 */
 774
 775 qboolean SCR_ScreenShot(char *filename, int x, int y, int width, int height)
 776 {
 777         qboolean ret;
 778         int i;
 779         qbyte *buffer;
 780
 781         if (!r_render.integer)
 782                 return false;
 783
 784         buffer = Mem_Alloc(tempmempool, width*height*3);
 785         qglReadPixels (x, y, width, height, GL_RGB, GL_UNSIGNED_BYTE, buffer);
 786         CHECKGLERROR
 787
 788         // LordHavoc: compensate for v_overbrightbits when using hardware gamma
 789         if (v_hwgamma.integer)
 790                 for (i = 0;i < width * height * 3;i++)
 791                         buffer[i] <<= v_overbrightbits.integer;
 792
 793         ret = Image_WriteTGARGB_preflipped(filename, width, height, buffer);
 794
 795         Mem_Free(buffer);
 796         return ret;
 797 }
 798
 799 //=============================================================================
 800
 801 void R_ClearScreen(void)
 802 {
 803         if (r_render.integer)
 804         {
 805                 // clear to black
 806                 qglClearColor(0,0,0,0);CHECKGLERROR
 807                 // clear the screen
 808                 qglClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);CHECKGLERROR
 809                 // set dithering mode
 810                 if (gl_dither.integer)
 811                 {
 812                         qglEnable(GL_DITHER);CHECKGLERROR
 813                 }
 814                 else
 815                 {
 816                         qglDisable(GL_DITHER);CHECKGLERROR
 817                 }
 818         }
 819 }
 820
 821 /*
 822 ==================
 823 SCR_UpdateScreen
 824
 825 This is called every frame, and can also be called explicitly to flush
 826 text to the screen.
 827 ==================
 828 */
 829 void SCR_UpdateScreen (void)
 830 {
 831         VID_Finish ();
 832
 833         R_TimeReport("finish");
 834
 835         if (r_textureunits.integer > gl_textureunits)
 836                 Cvar_SetValueQuick(&r_textureunits, gl_textureunits);
 837         if (r_textureunits.integer < 1)
 838                 Cvar_SetValueQuick(&r_textureunits, 1);
 839
 840         if (gl_combine.integer && (!gl_combine_extension || r_textureunits.integer < 2))
 841                 Cvar_SetValueQuick(&gl_combine, 0);
 842
 843         // lighting scale
 844         overbrightscale = 1.0f / (float) (1 << v_overbrightbits.integer);
 845
 846         // lightmaps only
 847         lightscalebit = v_overbrightbits.integer;
 848         if (gl_combine.integer && r_textureunits.integer > 1)
 849                 lightscalebit += 2;
 850         lightscale = 1.0f / (float) (1 << lightscalebit);
 851
 852         R_TimeReport("setup");
 853
 854         R_ClearScreen();
 855
 856         R_TimeReport("clear");
 857
 858         if (scr_conlines < vid.conheight && cls.signon == SIGNONS)
 859                 R_RenderView();
 860
 861         // draw 2D stuff
 862         R_DrawQueue();
 863
 864         // tell driver to commit it's partially full geometry queue to the rendering queue
 865         // (this doesn't wait for the commands themselves to complete)
 866         qglFlush();
 867 }
 868