gl_backend.c

   1
   2 #include "quakedef.h"
   3 #include "image.h"
   4
   5 cvar_t gl_mesh_maxverts = {0, "gl_mesh_maxverts", "1024"};
   6 cvar_t gl_mesh_floatcolors = {0, "gl_mesh_floatcolors", "1"};
   7 cvar_t gl_mesh_drawrangeelements = {0, "gl_mesh_drawrangeelements", "1"};
   8
   9 cvar_t r_render = {0, "r_render", "1"};
  10 cvar_t gl_dither = {CVAR_SAVE, "gl_dither", "1"}; // whether or not to use dithering
  11 cvar_t gl_lockarrays = {0, "gl_lockarrays", "1"};
  12
  13 int gl_maxdrawrangeelementsvertices;
  14 int gl_maxdrawrangeelementsindices;
  15
  16 #ifdef DEBUGGL
  17 int errornumber = 0;
  18
  19 void GL_PrintError(int errornumber, char *filename, int linenumber)
  20 {
  21         switch(errornumber)
  22         {
  23 #ifdef GL_INVALID_ENUM
  24         case GL_INVALID_ENUM:
  25                 Con_Printf("GL_INVALID_ENUM at %s:%i\n", filename, linenumber);
  26                 break;
  27 #endif
  28 #ifdef GL_INVALID_VALUE
  29         case GL_INVALID_VALUE:
  30                 Con_Printf("GL_INVALID_VALUE at %s:%i\n", filename, linenumber);
  31                 break;
  32 #endif
  33 #ifdef GL_INVALID_OPERATION
  34         case GL_INVALID_OPERATION:
  35                 Con_Printf("GL_INVALID_OPERATION at %s:%i\n", filename, linenumber);
  36                 break;
  37 #endif
  38 #ifdef GL_STACK_OVERFLOW
  39         case GL_STACK_OVERFLOW:
  40                 Con_Printf("GL_STACK_OVERFLOW at %s:%i\n", filename, linenumber);
  41                 break;
  42 #endif
  43 #ifdef GL_STACK_UNDERFLOW
  44         case GL_STACK_UNDERFLOW:
  45                 Con_Printf("GL_STACK_UNDERFLOW at %s:%i\n", filename, linenumber);
  46                 break;
  47 #endif
  48 #ifdef GL_OUT_OF_MEMORY
  49         case GL_OUT_OF_MEMORY:
  50                 Con_Printf("GL_OUT_OF_MEMORY at %s:%i\n", filename, linenumber);
  51                 break;
  52 #endif
  53 #ifdef GL_TABLE_TOO_LARGE
  54     case GL_TABLE_TOO_LARGE:
  55                 Con_Printf("GL_TABLE_TOO_LARGE at %s:%i\n", filename, linenumber);
  56                 break;
  57 #endif
  58         default:
  59                 Con_Printf("GL UNKNOWN (%i) at %s:%i\n", errornumber, filename, linenumber);
  60                 break;
  61         }
  62 }
  63 #endif
  64
  65 #define BACKENDACTIVECHECK if (!backendactive) Sys_Error("GL backend function called when backend is not active\n");
  66
  67 int c_meshs, c_meshelements;
  68
  69 void SCR_ScreenShot_f (void);
  70
  71 // these are externally accessible
  72 int r_lightmapscalebit;
  73 float r_colorscale;
  74 float *varray_vertex;
  75 float *varray_color;
  76 float *varray_texcoord[MAX_TEXTUREUNITS];
  77 int mesh_maxverts;
  78
  79 static matrix4x4_t backend_viewmatrix;
  80 static matrix4x4_t backend_modelmatrix;
  81 static matrix4x4_t backend_modelviewmatrix;
  82 static matrix4x4_t backend_glmodelviewmatrix;
  83
  84 static int backendunits, backendactive;
  85 static qbyte *varray_bcolor;
  86 static mempool_t *gl_backend_mempool;
  87
  88 int polygonelements[768];
  89
  90 void GL_Backend_AllocArrays(void)
  91 {
  92         int i;
  93
  94         for (i = 0;i < POLYGONELEMENTS_MAXPOINTS - 2;i++)
  95         {
  96                 polygonelements[i * 3 + 0] = 0;
  97                 polygonelements[i * 3 + 1] = i + 1;
  98                 polygonelements[i * 3 + 2] = i + 2;
  99         }
 100
 101         if (!gl_backend_mempool)
 102                 gl_backend_mempool = Mem_AllocPool("GL_Backend");
 103
 104         varray_vertex = Mem_Alloc(gl_backend_mempool, mesh_maxverts * sizeof(float[4]));
 105         varray_color = Mem_Alloc(gl_backend_mempool, mesh_maxverts * sizeof(float[4]));
 106         varray_bcolor = Mem_Alloc(gl_backend_mempool, mesh_maxverts * sizeof(qbyte[4]));
 107         for (i = 0;i < backendunits;i++)
 108                 varray_texcoord[i] = Mem_Alloc(gl_backend_mempool, mesh_maxverts * sizeof(float[4]));
 109         for (;i < MAX_TEXTUREUNITS;i++)
 110                 varray_texcoord[i] = NULL;
 111 }
 112
 113 void GL_Backend_FreeArrays(int resizingbuffers)
 114 {
 115         int i;
 116         if (resizingbuffers)
 117                 Mem_EmptyPool(gl_backend_mempool);
 118         else
 119                 Mem_FreePool(&gl_backend_mempool);
 120         varray_vertex = NULL;
 121         varray_color = NULL;
 122         varray_bcolor = NULL;
 123         for (i = 0;i < MAX_TEXTUREUNITS;i++)
 124                 varray_texcoord[i] = NULL;
 125 }
 126
 127 static void gl_backend_start(void)
 128 {
 129         Con_Printf("OpenGL Backend started with gl_mesh_maxverts %i\n", gl_mesh_maxverts.integer);
 130         if (qglDrawRangeElements != NULL)
 131         {
 132                 qglGetIntegerv(GL_MAX_ELEMENTS_VERTICES, &gl_maxdrawrangeelementsvertices);
 133                 qglGetIntegerv(GL_MAX_ELEMENTS_INDICES, &gl_maxdrawrangeelementsindices);
 134                 CHECKGLERROR
 135                 Con_Printf("glDrawRangeElements detected (max vertices %i, max indices %i)\n", gl_maxdrawrangeelementsvertices, gl_maxdrawrangeelementsindices);
 136         }
 137         if (strstr(gl_renderer, "3Dfx"))
 138         {
 139                 Con_Printf("3Dfx driver detected, forcing gl_mesh_floatcolors to 0 to prevent crashs\n");
 140                 Cvar_SetValueQuick(&gl_mesh_floatcolors, 0);
 141         }
 142
 143         backendunits = min(MAX_TEXTUREUNITS, gl_textureunits);
 144
 145         GL_Backend_AllocArrays();
 146
 147         backendactive = true;
 148 }
 149
 150 static void gl_backend_shutdown(void)
 151 {
 152         backendunits = 0;
 153         backendactive = false;
 154
 155         Con_Printf("OpenGL Backend shutting down\n");
 156
 157         GL_Backend_FreeArrays(false);
 158 }
 159
 160 void GL_Backend_CheckCvars(void)
 161 {
 162         // 21760 is (65536 / 3) rounded off to a multiple of 128
 163         if (gl_mesh_maxverts.integer < 1024)
 164                 Cvar_SetValueQuick(&gl_mesh_maxverts, 1024);
 165         if (gl_mesh_maxverts.integer > 21760)
 166                 Cvar_SetValueQuick(&gl_mesh_maxverts, 21760);
 167 }
 168
 169 void GL_Backend_ResizeArrays(int numtriangles)
 170 {
 171         Cvar_SetValueQuick(&gl_mesh_maxverts, numtriangles);
 172         GL_Backend_CheckCvars();
 173         mesh_maxverts = gl_mesh_maxverts.integer;
 174         GL_Backend_FreeArrays(true);
 175         GL_Backend_AllocArrays();
 176 }
 177
 178 static void gl_backend_newmap(void)
 179 {
 180 }
 181
 182 void gl_backend_init(void)
 183 {
 184         Cvar_RegisterVariable(&r_render);
 185         Cvar_RegisterVariable(&gl_dither);
 186         Cvar_RegisterVariable(&gl_lockarrays);
 187 #ifdef NORENDER
 188         Cvar_SetValue("r_render", 0);
 189 #endif
 190
 191         Cvar_RegisterVariable(&gl_mesh_maxverts);
 192         Cvar_RegisterVariable(&gl_mesh_floatcolors);
 193         Cvar_RegisterVariable(&gl_mesh_drawrangeelements);
 194         GL_Backend_CheckCvars();
 195         R_RegisterModule("GL_Backend", gl_backend_start, gl_backend_shutdown, gl_backend_newmap);
 196 }
 197
 198 void GL_SetupView_ViewPort (int x, int y, int width, int height)
 199 {
 200         if (!r_render.integer)
 201                 return;
 202
 203         // y is weird beause OpenGL is bottom to top, we use top to bottom
 204         qglViewport(x, vid.realheight - (y + height), width, height);
 205         CHECKGLERROR
 206 }
 207
 208 void GL_SetupView_Orientation_Identity (void)
 209 {
 210         Matrix4x4_CreateIdentity(&backend_viewmatrix);
 211         memset(&backend_modelmatrix, 0, sizeof(backend_modelmatrix));
 212 }
 213
 214 void GL_SetupView_Orientation_FromEntity (vec3_t origin, vec3_t angles)
 215 {
 216         Matrix4x4_CreateRotate(&backend_viewmatrix, -90, 1, 0, 0);
 217         Matrix4x4_ConcatRotate(&backend_viewmatrix, 90, 0, 0, 1);
 218         Matrix4x4_ConcatRotate(&backend_viewmatrix, -angles[2], 1, 0, 0);
 219         Matrix4x4_ConcatRotate(&backend_viewmatrix, -angles[0], 0, 1, 0);
 220         Matrix4x4_ConcatRotate(&backend_viewmatrix, -angles[1], 0, 0, 1);
 221         Matrix4x4_ConcatTranslate(&backend_viewmatrix, -origin[0], -origin[1], -origin[2]);
 222         memset(&backend_modelmatrix, 0, sizeof(backend_modelmatrix));
 223 }
 224
 225 void GL_SetupView_Mode_Perspective (double fovx, double fovy, double zNear, double zFar)
 226 {
 227         double xmax, ymax;
 228
 229         if (!r_render.integer)
 230                 return;
 231
 232         // set up viewpoint
 233         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 234         qglLoadIdentity ();CHECKGLERROR
 235         // pyramid slopes
 236         xmax = zNear * tan(fovx * M_PI / 360.0);
 237         ymax = zNear * tan(fovy * M_PI / 360.0);
 238         // set view pyramid
 239         qglFrustum(-xmax, xmax, -ymax, ymax, zNear, zFar);CHECKGLERROR
 240         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 241         GL_SetupView_Orientation_Identity();
 242 }
 243
 244 void GL_SetupView_Mode_PerspectiveInfiniteFarClip (double fovx, double fovy, double zNear)
 245 {
 246         double nudge, m[16];
 247
 248         if (!r_render.integer)
 249                 return;
 250
 251         // set up viewpoint
 252         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 253         qglLoadIdentity ();CHECKGLERROR
 254         // set view pyramid
 255         nudge = 1.0 - 1.0 / (1<<23);
 256         m[ 0] = 1.0 / tan(fovx * M_PI / 360.0);
 257         m[ 1] = 0;
 258         m[ 2] = 0;
 259         m[ 3] = 0;
 260         m[ 4] = 0;
 261         m[ 5] = 1.0 / tan(fovy * M_PI / 360.0);
 262         m[ 6] = 0;
 263         m[ 7] = 0;
 264         m[ 8] = 0;
 265         m[ 9] = 0;
 266         m[10] = -1 * nudge;
 267         m[11] = -1 * nudge;
 268         m[12] = 0;
 269         m[13] = 0;
 270         m[14] = -2 * zNear * nudge;
 271         m[15] = 0;
 272         qglLoadMatrixd(m);
 273         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 274         GL_SetupView_Orientation_Identity();
 275 }
 276
 277 void GL_SetupView_Mode_Ortho (double x1, double y1, double x2, double y2, double zNear, double zFar)
 278 {
 279         if (!r_render.integer)
 280                 return;
 281
 282         // set up viewpoint
 283         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 284         qglLoadIdentity ();CHECKGLERROR
 285         qglOrtho(x1, x2, y2, y1, zNear, zFar);
 286         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 287         GL_SetupView_Orientation_Identity();
 288 }
 289
 290 typedef struct gltextureunit_s
 291 {
 292         unsigned int t1d, t2d, t3d, tcubemap;
 293         unsigned int arrayenabled;
 294         float rgbscale, alphascale;
 295         int combinergb, combinealpha;
 296         // FIXME: add more combine stuff
 297 }
 298 gltextureunit_t;
 299
 300 static struct
 301 {
 302         int blendfunc1;
 303         int blendfunc2;
 304         int blend;
 305         GLboolean depthmask;
 306         int depthdisable;
 307         int unit;
 308         int clientunit;
 309         gltextureunit_t units[MAX_TEXTUREUNITS];
 310         int colorarray;
 311 }
 312 gl_state;
 313
 314 void GL_SetupTextureState(void)
 315 {
 316         int i;
 317         gltextureunit_t *unit;
 318         for (i = 0;i < backendunits;i++)
 319         {
 320                 if (qglActiveTexture)
 321                         qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 322                 if (qglClientActiveTexture)
 323                         qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 324                 unit = gl_state.units + i;
 325                 unit->t1d = 0;
 326                 unit->t2d = 0;
 327                 unit->t3d = 0;
 328                 unit->tcubemap = 0;
 329                 unit->rgbscale = 1;
 330                 unit->alphascale = 1;
 331                 unit->combinergb = GL_MODULATE;
 332                 unit->combinealpha = GL_MODULATE;
 333                 unit->arrayenabled = false;
 334                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 335                 if (gl_texture3d)
 336                 {
 337                         qglTexCoordPointer(3, GL_FLOAT, sizeof(float[4]), varray_texcoord[i]);CHECKGLERROR
 338                 }
 339                 else
 340                 {
 341                         qglTexCoordPointer(2, GL_FLOAT, sizeof(float[4]), varray_texcoord[i]);CHECKGLERROR
 342                 }
 343                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 344                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 345                 if (gl_texture3d)
 346                 {
 347                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 348                 }
 349                 if (gl_texturecubemap)
 350                 {
 351                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 352                 }
 353                 if (gl_combine.integer)
 354                 {
 355                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);CHECKGLERROR
 356                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_MODULATE);CHECKGLERROR
 357                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE);CHECKGLERROR
 358                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 359                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_RGB_ARB, GL_CONSTANT_ARB);CHECKGLERROR
 360                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 361                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 362                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_RGB_ARB, GL_SRC_ALPHA);CHECKGLERROR
 363                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, GL_MODULATE);CHECKGLERROR
 364                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA_ARB, GL_TEXTURE);CHECKGLERROR
 365                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_ALPHA_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 366                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_ALPHA_ARB, GL_CONSTANT_ARB);CHECKGLERROR
 367                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 368                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 369                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 370                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
 371                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
 372                 }
 373                 else
 374                 {
 375                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 376                 }
 377         }
 378 }
 379
 380 void GL_Backend_ResetState(void)
 381 {
 382         memset(&gl_state, 0, sizeof(gl_state));
 383         gl_state.depthdisable = false;
 384         gl_state.blendfunc1 = GL_ONE;
 385         gl_state.blendfunc2 = GL_ZERO;
 386         gl_state.blend = false;
 387         gl_state.depthmask = GL_TRUE;
 388         gl_state.colorarray = false;
 389
 390         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 391         qglDisableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 392
 393         qglEnable(GL_CULL_FACE);CHECKGLERROR
 394         qglCullFace(GL_FRONT);CHECKGLERROR
 395         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 396         qglBlendFunc(gl_state.blendfunc1, gl_state.blendfunc2);CHECKGLERROR
 397         qglDisable(GL_BLEND);CHECKGLERROR
 398         qglDepthMask(gl_state.depthmask);CHECKGLERROR
 399         qglVertexPointer(3, GL_FLOAT, sizeof(float[4]), varray_vertex);CHECKGLERROR
 400         qglEnableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 401         if (gl_mesh_floatcolors.integer)
 402         {
 403                 qglColorPointer(4, GL_FLOAT, sizeof(float[4]), varray_color);CHECKGLERROR
 404         }
 405         else
 406         {
 407                 qglColorPointer(4, GL_UNSIGNED_BYTE, sizeof(qbyte[4]), varray_bcolor);CHECKGLERROR
 408         }
 409         GL_Color(1, 1, 1, 1);
 410
 411         GL_SetupTextureState();
 412 }
 413
 414 void GL_UseColorArray(void)
 415 {
 416         if (!gl_state.colorarray)
 417         {
 418                 gl_state.colorarray = true;
 419                 qglEnableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 420         }
 421 }
 422
 423 void GL_Color(float cr, float cg, float cb, float ca)
 424 {
 425         if (gl_state.colorarray)
 426         {
 427                 gl_state.colorarray = false;
 428                 qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 429         }
 430         qglColor4f(cr, cg, cb, ca);
 431 }
 432
 433 // called at beginning of frame
 434 void R_Mesh_Start(void)
 435 {
 436         BACKENDACTIVECHECK
 437
 438         CHECKGLERROR
 439
 440         GL_Backend_CheckCvars();
 441         if (mesh_maxverts != gl_mesh_maxverts.integer)
 442                 GL_Backend_ResizeArrays(gl_mesh_maxverts.integer);
 443
 444         GL_Backend_ResetState();
 445 }
 446
 447 int gl_backend_rebindtextures;
 448
 449 void GL_ConvertColorsFloatToByte(int numverts)
 450 {
 451         int i, k, total;
 452         // LordHavoc: to avoid problems with aliasing (treating memory as two
 453         // different types - exactly what this is doing), these must be volatile
 454         // (or a union)
 455         volatile int *icolor;
 456         volatile float *fcolor;
 457         qbyte *bcolor;
 458
 459         total = numverts * 4;
 460
 461         // shift float to have 8bit fraction at base of number
 462         fcolor = varray_color;
 463         for (i = 0;i < total;)
 464         {
 465                 fcolor[i    ] += 32768.0f;
 466                 fcolor[i + 1] += 32768.0f;
 467                 fcolor[i + 2] += 32768.0f;
 468                 fcolor[i + 3] += 32768.0f;
 469                 i += 4;
 470         }
 471
 472         // then read as integer and kill float bits...
 473         icolor = (int *)varray_color;
 474         bcolor = varray_bcolor;
 475         for (i = 0;i < total;)
 476         {
 477                 k = icolor[i    ] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i    ] = (qbyte) k;
 478                 k = icolor[i + 1] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i + 1] = (qbyte) k;
 479                 k = icolor[i + 2] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i + 2] = (qbyte) k;
 480                 k = icolor[i + 3] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i + 3] = (qbyte) k;
 481                 i += 4;
 482         }
 483 }
 484
 485 void GL_DrawRangeElements(int firstvert, int endvert, int indexcount, const int *index)
 486 {
 487         int arraylocked = false;
 488         c_meshs++;
 489         c_meshelements += indexcount;
 490         if (indexcount == 0 || endvert == firstvert)
 491         {
 492                 Con_Printf("GL_DrawRangeElements(%d, %d, %d, %08p);\n", firstvert, endvert, indexcount, index);
 493                 return;
 494         }
 495         if (gl_supportslockarrays && gl_lockarrays.integer)
 496         {
 497                 qglLockArraysEXT(firstvert, endvert - firstvert);
 498                 CHECKGLERROR
 499                 arraylocked = true;
 500         }
 501         if (gl_mesh_drawrangeelements.integer && qglDrawRangeElements != NULL)
 502                 qglDrawRangeElements(GL_TRIANGLES, firstvert, endvert, indexcount, GL_UNSIGNED_INT, (const GLuint *) index);
 503         else
 504                 qglDrawElements(GL_TRIANGLES, indexcount, GL_UNSIGNED_INT, (const GLuint *) index);
 505         CHECKGLERROR
 506         if (arraylocked)
 507         {
 508                 qglUnlockArraysEXT();
 509                 CHECKGLERROR
 510                 arraylocked = false;
 511         }
 512 }
 513
 514 // enlarges geometry buffers if they are too small
 515 void _R_Mesh_ResizeCheck(int numverts)
 516 {
 517         if (numverts > mesh_maxverts)
 518         {
 519                 BACKENDACTIVECHECK
 520                 GL_Backend_ResizeArrays(numverts + 100);
 521                 GL_Backend_ResetState();
 522         }
 523 }
 524
 525 // renders the mesh
 526 void R_Mesh_Draw(int numverts, int numtriangles, const int *elements)
 527 {
 528         BACKENDACTIVECHECK
 529
 530         CHECKGLERROR
 531
 532         if (gl_state.colorarray && !gl_mesh_floatcolors.integer)
 533                 GL_ConvertColorsFloatToByte(numverts);
 534         if (!r_render.integer)
 535                 return;
 536         GL_DrawRangeElements(0, numverts, numtriangles * 3, elements);
 537 }
 538
 539 // restores backend state, used when done with 3D rendering
 540 void R_Mesh_Finish(void)
 541 {
 542         int i;
 543         BACKENDACTIVECHECK
 544
 545         for (i = backendunits - 1;i >= 0;i--)
 546         {
 547                 if (qglActiveTexture)
 548                         qglActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
 549                 if (qglClientActiveTexture)
 550                         qglClientActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
 551                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 552                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 553                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 554                 if (gl_texture3d)
 555                 {
 556                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 557                 }
 558                 if (gl_texturecubemap)
 559                 {
 560                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 561                 }
 562                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 563                 if (gl_combine.integer)
 564                 {
 565                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
 566                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
 567                 }
 568         }
 569         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 570         qglDisableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 571
 572         qglDisable(GL_BLEND);CHECKGLERROR
 573         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 574         qglDepthMask(GL_TRUE);CHECKGLERROR
 575         qglBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);CHECKGLERROR
 576 }
 577
 578 void R_Mesh_Matrix(const matrix4x4_t *matrix)
 579 {
 580         if (memcmp(matrix, &backend_modelmatrix, sizeof(matrix4x4_t)))
 581         {
 582                 backend_modelmatrix = *matrix;
 583                 Matrix4x4_Concat(&backend_modelviewmatrix, &backend_viewmatrix, matrix);
 584                 Matrix4x4_Transpose(&backend_glmodelviewmatrix, &backend_modelviewmatrix);
 585                 qglLoadMatrixf(&backend_glmodelviewmatrix.m[0][0]);
 586         }
 587 }
 588
 589 // sets up the requested state
 590 void R_Mesh_MainState(const rmeshstate_t *m)
 591 {
 592         BACKENDACTIVECHECK
 593
 594         if (gl_state.blendfunc1 != m->blendfunc1 || gl_state.blendfunc2 != m->blendfunc2)
 595         {
 596                 qglBlendFunc(gl_state.blendfunc1 = m->blendfunc1, gl_state.blendfunc2 = m->blendfunc2);CHECKGLERROR
 597                 if (gl_state.blendfunc2 == GL_ZERO)
 598                 {
 599                         if (gl_state.blendfunc1 == GL_ONE)
 600                         {
 601                                 if (gl_state.blend)
 602                                 {
 603                                         gl_state.blend = 0;
 604                                         qglDisable(GL_BLEND);CHECKGLERROR
 605                                 }
 606                         }
 607                         else
 608                         {
 609                                 if (!gl_state.blend)
 610                                 {
 611                                         gl_state.blend = 1;
 612                                         qglEnable(GL_BLEND);CHECKGLERROR
 613                                 }
 614                         }
 615                 }
 616                 else
 617                 {
 618                         if (!gl_state.blend)
 619                         {
 620                                 gl_state.blend = 1;
 621                                 qglEnable(GL_BLEND);CHECKGLERROR
 622                         }
 623                 }
 624         }
 625         if (gl_state.depthdisable != m->depthdisable)
 626         {
 627                 gl_state.depthdisable = m->depthdisable;
 628                 if (gl_state.depthdisable)
 629                         qglDisable(GL_DEPTH_TEST);
 630                 else
 631                         qglEnable(GL_DEPTH_TEST);
 632         }
 633         if (gl_state.depthmask != (m->blendfunc2 == GL_ZERO || m->depthwrite))
 634         {
 635                 qglDepthMask(gl_state.depthmask = (m->blendfunc2 == GL_ZERO || m->depthwrite));CHECKGLERROR
 636         }
 637 }
 638
 639 void R_Mesh_TextureState(const rmeshstate_t *m)
 640 {
 641         int i, combinergb, combinealpha;
 642         float scale;
 643         gltextureunit_t *unit;
 644
 645         BACKENDACTIVECHECK
 646
 647         if (gl_backend_rebindtextures)
 648         {
 649                 gl_backend_rebindtextures = false;
 650                 GL_SetupTextureState();
 651         }
 652
 653         for (i = 0;i < backendunits;i++)
 654         {
 655                 unit = gl_state.units + i;
 656                 if (unit->t1d != m->tex1d[i] || unit->t2d != m->tex[i] || unit->t3d != m->tex3d[i] || unit->tcubemap != m->texcubemap[i])
 657                 {
 658                         if (gl_state.unit != i)
 659                         {
 660                                 qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 661                         }
 662                         if (m->tex1d[i] || m->tex[i] || m->tex3d[i] || m->texcubemap[i])
 663                         {
 664                                 if (!unit->arrayenabled)
 665                                 {
 666                                         unit->arrayenabled = true;
 667                                         if (gl_state.clientunit != i)
 668                                         {
 669                                                 qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 670                                         }
 671                                         qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 672                                 }
 673                         }
 674                         else
 675                         {
 676                                 if (unit->arrayenabled)
 677                                 {
 678                                         unit->arrayenabled = false;
 679                                         if (gl_state.clientunit != i)
 680                                         {
 681                                                 qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 682                                         }
 683                                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 684                                 }
 685                         }
 686                         combinergb = m->texcombinergb[i];
 687                         combinealpha = m->texcombinealpha[i];
 688                         if (!combinergb)
 689                                 combinergb = GL_MODULATE;
 690                         if (!combinealpha)
 691                                 combinealpha = GL_MODULATE;
 692                         if (unit->combinergb != combinergb)
 693                         {
 694                                 unit->combinergb = combinergb;
 695                                 if (gl_combine.integer)
 696                                 {
 697                                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, unit->combinergb);CHECKGLERROR
 698                                 }
 699                                 else
 700                                 {
 701                                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, unit->combinergb);CHECKGLERROR
 702                                 }
 703                         }
 704                         if (unit->combinealpha != combinealpha)
 705                         {
 706                                 unit->combinealpha = combinealpha;
 707                                 if (gl_combine.integer)
 708                                 {
 709                                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, unit->combinealpha);CHECKGLERROR
 710                                 }
 711                         }
 712                         if (unit->t1d != m->tex1d[i])
 713                         {
 714                                 if (m->tex1d[i])
 715                                 {
 716                                         if (unit->t1d == 0)
 717                                                 qglEnable(GL_TEXTURE_1D);CHECKGLERROR
 718                                 }
 719                                 else
 720                                 {
 721                                         if (unit->t1d)
 722                                                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 723                                 }
 724                                 qglBindTexture(GL_TEXTURE_1D, (unit->t1d = m->tex1d[i]));CHECKGLERROR
 725                         }
 726                         if (unit->t2d != m->tex[i])
 727                         {
 728                                 if (m->tex[i])
 729                                 {
 730                                         if (unit->t2d == 0)
 731                                                 qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 732                                 }
 733                                 else
 734                                 {
 735                                         if (unit->t2d)
 736                                                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 737                                 }
 738                                 qglBindTexture(GL_TEXTURE_2D, (unit->t2d = m->tex[i]));CHECKGLERROR
 739                         }
 740                         if (unit->t3d != m->tex3d[i])
 741                         {
 742                                 if (m->tex3d[i])
 743                                 {
 744                                         if (unit->t3d == 0)
 745                                                 qglEnable(GL_TEXTURE_3D);CHECKGLERROR
 746                                 }
 747                                 else
 748                                 {
 749                                         if (unit->t3d)
 750                                                 qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 751                                 }
 752                                 qglBindTexture(GL_TEXTURE_3D, (unit->t3d = m->tex3d[i]));CHECKGLERROR
 753                         }
 754                         if (unit->tcubemap != m->texcubemap[i])
 755                         {
 756                                 if (m->texcubemap[i])
 757                                 {
 758                                         if (unit->tcubemap == 0)
 759                                                 qglEnable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 760                                 }
 761                                 else
 762                                 {
 763                                         if (unit->tcubemap)
 764                                                 qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 765                                 }
 766                                 qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, (unit->tcubemap = m->texcubemap[i]));CHECKGLERROR
 767                         }
 768                 }
 769                 scale = max(m->texrgbscale[i], 1);
 770                 if (gl_state.units[i].rgbscale != scale)
 771                 {
 772                         if (gl_state.unit != i)
 773                         {
 774                                 qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 775                         }
 776                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, (gl_state.units[i].rgbscale = scale));CHECKGLERROR
 777                 }
 778                 scale = max(m->texalphascale[i], 1);
 779                 if (gl_state.units[i].alphascale != scale)
 780                 {
 781                         if (gl_state.unit != i)
 782                         {
 783                                 qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 784                         }
 785                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, (gl_state.units[i].alphascale = scale));CHECKGLERROR
 786                 }
 787         }
 788 }
 789
 790 void R_Mesh_State(const rmeshstate_t *m)
 791 {
 792         R_Mesh_MainState(m);
 793         R_Mesh_TextureState(m);
 794 }
 795
 796 /*
 797 ==============================================================================
 798
 799                                                 SCREEN SHOTS
 800
 801 ==============================================================================
 802 */
 803
 804 qboolean SCR_ScreenShot(char *filename, int x, int y, int width, int height)
 805 {
 806         qboolean ret;
 807         int i;
 808         qbyte *buffer;
 809
 810         if (!r_render.integer)
 811                 return false;
 812
 813         buffer = Mem_Alloc(tempmempool, width*height*3);
 814         qglReadPixels (x, y, width, height, GL_RGB, GL_UNSIGNED_BYTE, buffer);
 815         CHECKGLERROR
 816
 817         // LordHavoc: compensate for v_overbrightbits when using hardware gamma
 818         if (v_hwgamma.integer)
 819                 for (i = 0;i < width * height * 3;i++)
 820                         buffer[i] <<= v_overbrightbits.integer;
 821
 822         ret = Image_WriteTGARGB_preflipped(filename, width, height, buffer);
 823
 824         Mem_Free(buffer);
 825         return ret;
 826 }
 827
 828 //=============================================================================
 829
 830 void R_ClearScreen(void)
 831 {
 832         if (r_render.integer)
 833         {
 834                 // clear to black
 835                 qglClearColor(0,0,0,0);CHECKGLERROR
 836                 // clear the screen
 837                 qglClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | (gl_stencil ? GL_STENCIL_BUFFER_BIT : 0));CHECKGLERROR
 838                 // set dithering mode
 839                 if (gl_dither.integer)
 840                 {
 841                         qglEnable(GL_DITHER);CHECKGLERROR
 842                 }
 843                 else
 844                 {
 845                         qglDisable(GL_DITHER);CHECKGLERROR
 846                 }
 847         }
 848 }
 849
 850 /*
 851 ==================
 852 SCR_UpdateScreen
 853
 854 This is called every frame, and can also be called explicitly to flush
 855 text to the screen.
 856 ==================
 857 */
 858 void SCR_UpdateScreen (void)
 859 {
 860         VID_Finish ();
 861
 862         R_TimeReport("finish");
 863
 864         if (r_textureunits.integer > gl_textureunits)
 865                 Cvar_SetValueQuick(&r_textureunits, gl_textureunits);
 866         if (r_textureunits.integer < 1)
 867                 Cvar_SetValueQuick(&r_textureunits, 1);
 868
 869         if (gl_combine.integer && (!gl_combine_extension || r_textureunits.integer < 2))
 870                 Cvar_SetValueQuick(&gl_combine, 0);
 871
 872         // lighting scale
 873         r_colorscale = 1.0f / (float) (1 << v_overbrightbits.integer);
 874
 875         // lightmaps only
 876         r_lightmapscalebit = v_overbrightbits.integer;
 877         if (gl_combine.integer && r_textureunits.integer > 1)
 878                 r_lightmapscalebit += 2;
 879
 880         R_TimeReport("setup");
 881
 882         R_ClearScreen();
 883
 884         R_TimeReport("clear");
 885
 886         if (scr_conlines < vid.conheight && cls.signon == SIGNONS)
 887                 R_RenderView();
 888
 889         // draw 2D stuff
 890         R_DrawQueue();
 891
 892         // tell driver to commit it's partially full geometry queue to the rendering queue
 893         // (this doesn't wait for the commands themselves to complete)
 894         qglFlush();
 895 }
 896