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