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 float r_mesh_farclip;
  67
  68 int c_meshs, c_meshelements;
  69
  70 int lightscalebit;
  71 float lightscale;
  72 float overbrightscale;
  73
  74 void SCR_ScreenShot_f (void);
  75
  76 // these are externally accessible
  77 float mesh_colorscale;
  78 float *varray_vertex;
  79 float *varray_color;
  80 float *varray_texcoord[MAX_TEXTUREUNITS];
  81 int mesh_maxverts;
  82
  83 static matrix4x4_t backend_viewmatrix;
  84 static matrix4x4_t backend_modelmatrix;
  85 static matrix4x4_t backend_modelviewmatrix;
  86 static matrix4x4_t backend_glmodelviewmatrix;
  87
  88 static int backendunits, backendactive;
  89 static qbyte *varray_bcolor;
  90 static mempool_t *gl_backend_mempool;
  91
  92 int polygonelements[768];
  93
  94 void GL_Backend_AllocArrays(void)
  95 {
  96         int i;
  97
  98         for (i = 0;i < POLYGONELEMENTS_MAXPOINTS - 2;i++)
  99         {
 100                 polygonelements[i * 3 + 0] = 0;
 101                 polygonelements[i * 3 + 1] = i + 1;
 102                 polygonelements[i * 3 + 2] = i + 2;
 103         }
 104
 105         if (!gl_backend_mempool)
 106                 gl_backend_mempool = Mem_AllocPool("GL_Backend");
 107
 108         varray_vertex = Mem_Alloc(gl_backend_mempool, mesh_maxverts * sizeof(float[4]));
 109         varray_color = Mem_Alloc(gl_backend_mempool, mesh_maxverts * sizeof(float[4]));
 110         varray_bcolor = Mem_Alloc(gl_backend_mempool, mesh_maxverts * sizeof(qbyte[4]));
 111         for (i = 0;i < backendunits;i++)
 112                 varray_texcoord[i] = Mem_Alloc(gl_backend_mempool, mesh_maxverts * sizeof(float[2]));
 113         for (;i < MAX_TEXTUREUNITS;i++)
 114                 varray_texcoord[i] = NULL;
 115 }
 116
 117 void GL_Backend_FreeArrays(int resizingbuffers)
 118 {
 119         int i;
 120         if (resizingbuffers)
 121                 Mem_EmptyPool(gl_backend_mempool);
 122         else
 123                 Mem_FreePool(&gl_backend_mempool);
 124         varray_vertex = NULL;
 125         varray_color = NULL;
 126         varray_bcolor = NULL;
 127         for (i = 0;i < MAX_TEXTUREUNITS;i++)
 128                 varray_texcoord[i] = NULL;
 129 }
 130
 131 static void gl_backend_start(void)
 132 {
 133         Con_Printf("OpenGL Backend started with gl_mesh_maxverts %i\n", gl_mesh_maxverts.integer);
 134         if (qglDrawRangeElements != NULL)
 135         {
 136                 qglGetIntegerv(GL_MAX_ELEMENTS_VERTICES, &gl_maxdrawrangeelementsvertices);
 137                 qglGetIntegerv(GL_MAX_ELEMENTS_INDICES, &gl_maxdrawrangeelementsindices);
 138                 CHECKGLERROR
 139                 Con_Printf("glDrawRangeElements detected (max vertices %i, max indices %i)\n", gl_maxdrawrangeelementsvertices, gl_maxdrawrangeelementsindices);
 140         }
 141         if (strstr(gl_renderer, "3Dfx"))
 142         {
 143                 Con_Printf("3Dfx driver detected, forcing gl_mesh_floatcolors to 0 to prevent crashs\n");
 144                 Cvar_SetValueQuick(&gl_mesh_floatcolors, 0);
 145         }
 146
 147         backendunits = min(MAX_TEXTUREUNITS, gl_textureunits);
 148
 149         GL_Backend_AllocArrays();
 150
 151         backendactive = true;
 152 }
 153
 154 static void gl_backend_shutdown(void)
 155 {
 156         backendunits = 0;
 157         backendactive = false;
 158
 159         Con_Printf("OpenGL Backend shutting down\n");
 160
 161         GL_Backend_FreeArrays(false);
 162 }
 163
 164 void GL_Backend_CheckCvars(void)
 165 {
 166         // 21760 is (65536 / 3) rounded off to a multiple of 128
 167         if (gl_mesh_maxverts.integer < 1024)
 168                 Cvar_SetValueQuick(&gl_mesh_maxverts, 1024);
 169         if (gl_mesh_maxverts.integer > 21760)
 170                 Cvar_SetValueQuick(&gl_mesh_maxverts, 21760);
 171 }
 172
 173 void GL_Backend_ResizeArrays(int numtriangles)
 174 {
 175         Cvar_SetValueQuick(&gl_mesh_maxverts, numtriangles);
 176         GL_Backend_CheckCvars();
 177         mesh_maxverts = gl_mesh_maxverts.integer;
 178         GL_Backend_FreeArrays(true);
 179         GL_Backend_AllocArrays();
 180 }
 181
 182 static void gl_backend_newmap(void)
 183 {
 184 }
 185
 186 void gl_backend_init(void)
 187 {
 188         Cvar_RegisterVariable(&r_render);
 189         Cvar_RegisterVariable(&gl_dither);
 190         Cvar_RegisterVariable(&gl_lockarrays);
 191 #ifdef NORENDER
 192         Cvar_SetValue("r_render", 0);
 193 #endif
 194
 195         Cvar_RegisterVariable(&gl_mesh_maxverts);
 196         Cvar_RegisterVariable(&gl_mesh_floatcolors);
 197         Cvar_RegisterVariable(&gl_mesh_drawrangeelements);
 198         GL_Backend_CheckCvars();
 199         R_RegisterModule("GL_Backend", gl_backend_start, gl_backend_shutdown, gl_backend_newmap);
 200 }
 201
 202 /*
 203 =============
 204 GL_SetupFrame
 205 =============
 206 */
 207 static void GL_SetupFrame (void)
 208 {
 209         double xmax, ymax;
 210         double fovx, fovy, zNear, zFar, aspect;
 211
 212         if (!r_render.integer)
 213                 return;
 214
 215         qglDepthFunc (GL_LEQUAL);CHECKGLERROR
 216
 217         // set up viewpoint
 218         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 219         qglLoadIdentity ();CHECKGLERROR
 220
 221         // y is weird beause OpenGL is bottom to top, we use top to bottom
 222         qglViewport(r_refdef.x, vid.realheight - (r_refdef.y + r_refdef.height), r_refdef.width, r_refdef.height);CHECKGLERROR
 223
 224         // depth range
 225         zNear = 1.0;
 226         zFar = r_mesh_farclip;
 227         if (zFar < 64)
 228                 zFar = 64;
 229
 230         // fov angles
 231         fovx = r_refdef.fov_x;
 232         fovy = r_refdef.fov_y;
 233         aspect = r_refdef.width / r_refdef.height;
 234
 235         // pyramid slopes
 236         xmax = zNear * tan(fovx * M_PI / 360.0) * aspect;
 237         ymax = zNear * tan(fovy * M_PI / 360.0);
 238
 239         // set view pyramid
 240         qglFrustum(-xmax, xmax, -ymax, ymax, zNear, zFar);CHECKGLERROR
 241
 242         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 243
 244         Matrix4x4_CreateRotate(&backend_viewmatrix, -90, 1, 0, 0);
 245         Matrix4x4_ConcatRotate(&backend_viewmatrix, 90, 0, 0, 1);
 246         Matrix4x4_ConcatRotate(&backend_viewmatrix, -r_refdef.viewangles[2], 1, 0, 0);
 247         Matrix4x4_ConcatRotate(&backend_viewmatrix, -r_refdef.viewangles[0], 0, 1, 0);
 248         Matrix4x4_ConcatRotate(&backend_viewmatrix, -r_refdef.viewangles[1], 0, 0, 1);
 249         Matrix4x4_ConcatTranslate(&backend_viewmatrix, -r_refdef.vieworg[0],  -r_refdef.vieworg[1],  -r_refdef.vieworg[2]);
 250         //Con_Printf("Our Matrix:\n");
 251         //Matrix4x4_Print(&backend_viewmatrix);
 252
 253         //Matrix4x4_Transpose(&backend_glmodelviewmatrix, &backend_viewmatrix);
 254         //qglLoadMatrixf(&backend_glmodelviewmatrix.m[0][0]);CHECKGLERROR
 255         memset(&backend_modelmatrix, 0, sizeof(backend_modelmatrix));
 256
 257         /*
 258         // put Z going up
 259         qglLoadIdentity ();CHECKGLERROR
 260         qglRotatef (-90,  1, 0, 0);CHECKGLERROR
 261         qglRotatef (90,  0, 0, 1);CHECKGLERROR
 262         // camera rotation
 263         qglRotatef (-r_refdef.viewangles[2],  1, 0, 0);CHECKGLERROR
 264         qglRotatef (-r_refdef.viewangles[0],  0, 1, 0);CHECKGLERROR
 265         qglRotatef (-r_refdef.viewangles[1],  0, 0, 1);CHECKGLERROR
 266         // camera location
 267         qglTranslatef (-r_refdef.vieworg[0],  -r_refdef.vieworg[1],  -r_refdef.vieworg[2]);CHECKGLERROR
 268         qglGetFloatv (GL_MODELVIEW_MATRIX, &gl_viewmatrix.m[0][0]);
 269         Matrix4x4_Transpose(&backend_viewmatrix, &gl_viewmatrix);
 270         Con_Printf("GL Matrix:\n");
 271         Matrix4x4_Print(&backend_viewmatrix);
 272         */
 273 }
 274
 275 static struct
 276 {
 277         int blendfunc1;
 278         int blendfunc2;
 279         int blend;
 280         GLboolean depthmask;
 281         int depthdisable;
 282         int unit;
 283         int clientunit;
 284         int texture[MAX_TEXTUREUNITS];
 285         float texturergbscale[MAX_TEXTUREUNITS];
 286 }
 287 gl_state;
 288
 289 void GL_SetupTextureState(void)
 290 {
 291         int i;
 292         if (backendunits > 1)
 293         {
 294                 for (i = 0;i < backendunits;i++)
 295                 {
 296                         qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 297                         qglBindTexture(GL_TEXTURE_2D, gl_state.texture[i]);CHECKGLERROR
 298                         if (gl_combine.integer)
 299                         {
 300                                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);CHECKGLERROR
 301                                 qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_MODULATE);CHECKGLERROR
 302                                 qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE);CHECKGLERROR
 303                                 qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 304                                 qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_RGB_ARB, GL_CONSTANT_ARB);CHECKGLERROR
 305                                 qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 306                                 qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 307                                 qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_RGB_ARB, GL_SRC_ALPHA);CHECKGLERROR
 308                                 qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, GL_MODULATE);CHECKGLERROR
 309                                 qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA_ARB, GL_TEXTURE);CHECKGLERROR
 310                                 qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_ALPHA_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 311                                 qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_ALPHA_ARB, GL_CONSTANT_ARB);CHECKGLERROR
 312                                 qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 313                                 qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 314                                 qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 315                                 qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, gl_state.texturergbscale[i]);CHECKGLERROR
 316                                 qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
 317                         }
 318                         else
 319                         {
 320                                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 321                         }
 322                         if (gl_state.texture[i])
 323                         {
 324                                 qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 325                         }
 326                         else
 327                         {
 328                                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 329                         }
 330                         qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 331                         qglTexCoordPointer(2, GL_FLOAT, sizeof(float[2]), varray_texcoord[i]);CHECKGLERROR
 332                         if (gl_state.texture[i])
 333                         {
 334                                 qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 335                         }
 336                         else
 337                         {
 338                                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 339                         }
 340                 }
 341         }
 342         else
 343         {
 344                 qglBindTexture(GL_TEXTURE_2D, gl_state.texture[0]);CHECKGLERROR
 345                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 346                 if (gl_state.texture[0])
 347                 {
 348                         qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 349                 }
 350                 else
 351                 {
 352                         qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 353                 }
 354                 qglTexCoordPointer(2, GL_FLOAT, sizeof(float[2]), varray_texcoord[0]);CHECKGLERROR
 355                 if (gl_state.texture[0])
 356                 {
 357                         qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 358                 }
 359                 else
 360                 {
 361                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 362                 }
 363         }
 364 }
 365
 366 int usedarrays;
 367 void GL_Backend_ResetState(void)
 368 {
 369         int i;
 370         gl_state.unit = 0;
 371         gl_state.clientunit = 0;
 372
 373         for (i = 0;i < backendunits;i++)
 374         {
 375                 gl_state.texture[i] = 0;
 376                 gl_state.texturergbscale[i] = 1;
 377         }
 378
 379         qglEnable(GL_CULL_FACE);CHECKGLERROR
 380         qglCullFace(GL_FRONT);CHECKGLERROR
 381
 382         gl_state.depthdisable = false;
 383         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 384
 385         gl_state.blendfunc1 = GL_ONE;
 386         gl_state.blendfunc2 = GL_ZERO;
 387         qglBlendFunc(gl_state.blendfunc1, gl_state.blendfunc2);CHECKGLERROR
 388
 389         gl_state.blend = 0;
 390         qglDisable(GL_BLEND);CHECKGLERROR
 391
 392         gl_state.depthmask = GL_TRUE;
 393         qglDepthMask(gl_state.depthmask);CHECKGLERROR
 394
 395         usedarrays = false;
 396         usedarrays = true;
 397         qglVertexPointer(3, GL_FLOAT, sizeof(float[4]), varray_vertex);CHECKGLERROR
 398         qglEnableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 399         if (gl_mesh_floatcolors.integer)
 400         {
 401                 qglColorPointer(4, GL_FLOAT, sizeof(float[4]), varray_color);CHECKGLERROR
 402         }
 403         else
 404         {
 405                 qglColorPointer(4, GL_UNSIGNED_BYTE, sizeof(qbyte[4]), varray_bcolor);CHECKGLERROR
 406         }
 407         qglEnableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 408
 409         GL_SetupTextureState();
 410 }
 411
 412 // called at beginning of frame
 413 void R_Mesh_Start(float farclip)
 414 {
 415         BACKENDACTIVECHECK
 416
 417         CHECKGLERROR
 418
 419         r_mesh_farclip = farclip;
 420
 421         GL_Backend_CheckCvars();
 422         if (mesh_maxverts != gl_mesh_maxverts.integer)
 423                 GL_Backend_ResizeArrays(gl_mesh_maxverts.integer);
 424
 425         GL_SetupFrame();
 426
 427         GL_Backend_ResetState();
 428 }
 429
 430 int gl_backend_rebindtextures;
 431
 432 void GL_ConvertColorsFloatToByte(int numverts)
 433 {
 434         int i, k, total;
 435         // LordHavoc: to avoid problems with aliasing (treating memory as two
 436         // different types - exactly what this is doing), these must be volatile
 437         // (or a union)
 438         volatile int *icolor;
 439         volatile float *fcolor;
 440         qbyte *bcolor;
 441
 442         total = numverts * 4;
 443
 444         // shift float to have 8bit fraction at base of number
 445         fcolor = varray_color;
 446         for (i = 0;i < total;)
 447         {
 448                 fcolor[i    ] += 32768.0f;
 449                 fcolor[i + 1] += 32768.0f;
 450                 fcolor[i + 2] += 32768.0f;
 451                 fcolor[i + 3] += 32768.0f;
 452                 i += 4;
 453         }
 454
 455         // then read as integer and kill float bits...
 456         icolor = (int *)varray_color;
 457         bcolor = varray_bcolor;
 458         for (i = 0;i < total;)
 459         {
 460                 k = icolor[i    ] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i    ] = (qbyte) k;
 461                 k = icolor[i + 1] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i + 1] = (qbyte) k;
 462                 k = icolor[i + 2] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i + 2] = (qbyte) k;
 463                 k = icolor[i + 3] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i + 3] = (qbyte) k;
 464                 i += 4;
 465         }
 466 }
 467
 468 /*
 469 void GL_TransformVertices(int numverts)
 470 {
 471         int i;
 472         float m[12], tempv[4], *v;
 473         m[0] = backendmatrix.m[0][0];
 474         m[1] = backendmatrix.m[0][1];
 475         m[2] = backendmatrix.m[0][2];
 476         m[3] = backendmatrix.m[0][3];
 477         m[4] = backendmatrix.m[1][0];
 478         m[5] = backendmatrix.m[1][1];
 479         m[6] = backendmatrix.m[1][2];
 480         m[7] = backendmatrix.m[1][3];
 481         m[8] = backendmatrix.m[2][0];
 482         m[9] = backendmatrix.m[2][1];
 483         m[10] = backendmatrix.m[2][2];
 484         m[11] = backendmatrix.m[2][3];
 485         for (i = 0, v = varray_vertex;i < numverts;i++, v += 4)
 486         {
 487                 VectorCopy(v, tempv);
 488                 v[0] = tempv[0] * m[0] + tempv[1] * m[1] + tempv[2] * m[2] + m[3];
 489                 v[1] = tempv[0] * m[4] + tempv[1] * m[5] + tempv[2] * m[6] + m[7];
 490                 v[2] = tempv[0] * m[8] + tempv[1] * m[9] + tempv[2] * m[10] + m[11];
 491         }
 492 }
 493 */
 494
 495 void GL_DrawRangeElements(int firstvert, int endvert, int indexcount, int *index)
 496 {
 497         int arraylocked = false;
 498         c_meshs++;
 499         c_meshelements += indexcount;
 500         if (gl_supportslockarrays && gl_lockarrays.integer)
 501         {
 502                 qglLockArraysEXT(firstvert, endvert - firstvert);
 503                 CHECKGLERROR
 504                 arraylocked = true;
 505         }
 506         if (gl_mesh_drawrangeelements.integer && qglDrawRangeElements != NULL)
 507                 qglDrawRangeElements(GL_TRIANGLES, firstvert, endvert, indexcount, GL_UNSIGNED_INT, (GLuint *) index);
 508         else
 509                 qglDrawElements(GL_TRIANGLES, indexcount, GL_UNSIGNED_INT, (GLuint *) index);
 510         CHECKGLERROR
 511         if (arraylocked)
 512         {
 513                 qglUnlockArraysEXT();
 514                 CHECKGLERROR
 515                 arraylocked = false;
 516         }
 517 }
 518
 519 // enlarges geometry buffers if they are too small
 520 void _R_Mesh_ResizeCheck(int numverts)
 521 {
 522         if (numverts > mesh_maxverts)
 523         {
 524                 BACKENDACTIVECHECK
 525                 GL_Backend_ResizeArrays(numverts + 100);
 526                 GL_Backend_ResetState();
 527         }
 528 }
 529
 530 // renders the mesh
 531 void R_Mesh_Draw(int numverts, int numtriangles, int *elements)
 532 {
 533         BACKENDACTIVECHECK
 534
 535         CHECKGLERROR
 536
 537         if (!gl_mesh_floatcolors.integer)
 538                 GL_ConvertColorsFloatToByte(numverts);
 539         //GL_TransformVertices(numverts);
 540         if (!r_render.integer)
 541                 return;
 542         GL_DrawRangeElements(0, numverts, numtriangles * 3, elements);
 543 }
 544
 545 // restores backend state, used when done with 3D rendering
 546 void R_Mesh_Finish(void)
 547 {
 548         int i;
 549         BACKENDACTIVECHECK
 550
 551         if (backendunits > 1)
 552         {
 553                 for (i = backendunits - 1;i >= 0;i--)
 554                 {
 555                         qglActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
 556                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 557                         if (gl_combine.integer)
 558                         {
 559                                 qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
 560                         }
 561                         if (i > 0)
 562                         {
 563                                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 564                         }
 565                         else
 566                         {
 567                                 qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 568                         }
 569                         qglBindTexture(GL_TEXTURE_2D, 0);CHECKGLERROR
 570
 571                         if (usedarrays)
 572                         {
 573                                 qglClientActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
 574                                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 575                         }
 576                 }
 577         }
 578         else
 579         {
 580                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 581                 qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 582                 if (usedarrays)
 583                 {
 584                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 585                 }
 586         }
 587         if (usedarrays)
 588         {
 589                 qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 590                 qglDisableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 591         }
 592
 593         qglDisable(GL_BLEND);CHECKGLERROR
 594         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 595         qglDepthMask(GL_TRUE);CHECKGLERROR
 596         qglBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);CHECKGLERROR
 597 }
 598
 599 void R_Mesh_ClearDepth(void)
 600 {
 601         BACKENDACTIVECHECK
 602
 603         R_Mesh_Finish();
 604         qglClear(GL_DEPTH_BUFFER_BIT);
 605         R_Mesh_Start(r_mesh_farclip);
 606 }
 607
 608 void R_Mesh_Matrix(const matrix4x4_t *matrix)
 609 {
 610         if (memcmp(matrix, &backend_modelmatrix, sizeof(matrix4x4_t)))
 611         {
 612                 backend_modelmatrix = *matrix;
 613                 Matrix4x4_Concat(&backend_modelviewmatrix, &backend_viewmatrix, matrix);
 614                 Matrix4x4_Transpose(&backend_glmodelviewmatrix, &backend_modelviewmatrix);
 615                 qglLoadMatrixf(&backend_glmodelviewmatrix.m[0][0]);
 616         }
 617 }
 618
 619 // sets up the requested state
 620 void R_Mesh_State(const rmeshstate_t *m)
 621 {
 622         int i, overbright;
 623         int texturergbscale[MAX_TEXTUREUNITS];
 624         float scaler;
 625
 626         BACKENDACTIVECHECK
 627
 628         if (gl_backend_rebindtextures)
 629         {
 630                 gl_backend_rebindtextures = false;
 631                 GL_SetupTextureState();
 632         }
 633
 634         overbright = false;
 635         scaler = 1;
 636         if (m->blendfunc1 == GL_DST_COLOR)
 637         {
 638                 // check if it is a 2x modulate with framebuffer
 639                 if (m->blendfunc2 == GL_SRC_COLOR)
 640                         scaler *= 0.5f;
 641         }
 642         else if (m->blendfunc2 != GL_SRC_COLOR)
 643         {
 644                 if (m->tex[0])
 645                 {
 646                         overbright = m->wantoverbright && gl_combine.integer;
 647                         if (overbright)
 648                                 scaler *= 0.25f;
 649                 }
 650                 scaler *= overbrightscale;
 651         }
 652         mesh_colorscale = scaler;
 653
 654         if (gl_state.blendfunc1 != m->blendfunc1 || gl_state.blendfunc2 != m->blendfunc2)
 655         {
 656                 qglBlendFunc(gl_state.blendfunc1 = m->blendfunc1, gl_state.blendfunc2 = m->blendfunc2);CHECKGLERROR
 657                 if (gl_state.blendfunc2 == GL_ZERO)
 658                 {
 659                         if (gl_state.blendfunc1 == GL_ONE)
 660                         {
 661                                 if (gl_state.blend)
 662                                 {
 663                                         gl_state.blend = 0;
 664                                         qglDisable(GL_BLEND);CHECKGLERROR
 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                 else
 677                 {
 678                         if (!gl_state.blend)
 679                         {
 680                                 gl_state.blend = 1;
 681                                 qglEnable(GL_BLEND);CHECKGLERROR
 682                         }
 683                 }
 684         }
 685         if (gl_state.depthdisable != m->depthdisable)
 686         {
 687                 gl_state.depthdisable = m->depthdisable;
 688                 if (gl_state.depthdisable)
 689                         qglDisable(GL_DEPTH_TEST);
 690                 else
 691                         qglEnable(GL_DEPTH_TEST);
 692         }
 693         if (gl_state.depthmask != (m->blendfunc2 == GL_ZERO || m->depthwrite))
 694         {
 695                 qglDepthMask(gl_state.depthmask = (m->blendfunc2 == GL_ZERO || m->depthwrite));CHECKGLERROR
 696         }
 697
 698         for (i = 0;i < backendunits;i++)
 699         {
 700                 if (m->texrgbscale[i])
 701                         texturergbscale[i] = m->texrgbscale[i];
 702                 else
 703                         texturergbscale[i] = 1;
 704         }
 705         if (overbright)
 706         {
 707                 for (i = backendunits - 1;i >= 0;i--)
 708                 {
 709                         if (m->tex[i])
 710                         {
 711                                 texturergbscale[i] = 4;
 712                                 break;
 713                         }
 714                 }
 715         }
 716
 717         if (backendunits > 1)
 718         {
 719                 for (i = 0;i < backendunits;i++)
 720                 {
 721                         if (gl_state.texture[i] != m->tex[i])
 722                         {
 723                                 if (gl_state.unit != i)
 724                                 {
 725                                         qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 726                                 }
 727                                 if (gl_state.texture[i] == 0)
 728                                 {
 729                                         qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 730                                         if (gl_state.clientunit != i)
 731                                         {
 732                                                 qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 733                                         }
 734                                         qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 735                                 }
 736                                 qglBindTexture(GL_TEXTURE_2D, (gl_state.texture[i] = m->tex[i]));CHECKGLERROR
 737                                 if (gl_state.texture[i] == 0)
 738                                 {
 739                                         qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 740                                         if (gl_state.clientunit != i)
 741                                         {
 742                                                 qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 743                                         }
 744                                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 745                                 }
 746                         }
 747                         if (gl_state.texturergbscale[i] != texturergbscale[i])
 748                         {
 749                                 if (gl_state.unit != i)
 750                                 {
 751                                         qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 752                                 }
 753                                 qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, (gl_state.texturergbscale[i] = texturergbscale[i]));CHECKGLERROR
 754                         }
 755                 }
 756         }
 757         else
 758         {
 759                 if (gl_state.texture[0] != m->tex[0])
 760                 {
 761                         if (gl_state.texture[0] == 0)
 762                         {
 763                                 qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 764                                 qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 765                         }
 766                         qglBindTexture(GL_TEXTURE_2D, (gl_state.texture[0] = m->tex[0]));CHECKGLERROR
 767                         if (gl_state.texture[0] == 0)
 768                         {
 769                                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 770                                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 771                         }
 772                 }
 773         }
 774 }
 775
 776 /*
 777 ==============================================================================
 778
 779                                                 SCREEN SHOTS
 780
 781 ==============================================================================
 782 */
 783
 784 qboolean SCR_ScreenShot(char *filename, int x, int y, int width, int height)
 785 {
 786         qboolean ret;
 787         int i;
 788         qbyte *buffer;
 789
 790         if (!r_render.integer)
 791                 return false;
 792
 793         buffer = Mem_Alloc(tempmempool, width*height*3);
 794         qglReadPixels (x, y, width, height, GL_RGB, GL_UNSIGNED_BYTE, buffer);
 795         CHECKGLERROR
 796
 797         // LordHavoc: compensate for v_overbrightbits when using hardware gamma
 798         if (v_hwgamma.integer)
 799                 for (i = 0;i < width * height * 3;i++)
 800                         buffer[i] <<= v_overbrightbits.integer;
 801
 802         ret = Image_WriteTGARGB_preflipped(filename, width, height, buffer);
 803
 804         Mem_Free(buffer);
 805         return ret;
 806 }
 807
 808 //=============================================================================
 809
 810 void R_ClearScreen(void)
 811 {
 812         if (r_render.integer)
 813         {
 814                 // clear to black
 815                 qglClearColor(0,0,0,0);CHECKGLERROR
 816                 // clear the screen
 817                 qglClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);CHECKGLERROR
 818                 // set dithering mode
 819                 if (gl_dither.integer)
 820                 {
 821                         qglEnable(GL_DITHER);CHECKGLERROR
 822                 }
 823                 else
 824                 {
 825                         qglDisable(GL_DITHER);CHECKGLERROR
 826                 }
 827         }
 828 }
 829
 830 /*
 831 ==================
 832 SCR_UpdateScreen
 833
 834 This is called every frame, and can also be called explicitly to flush
 835 text to the screen.
 836 ==================
 837 */
 838 void SCR_UpdateScreen (void)
 839 {
 840         VID_Finish ();
 841
 842         R_TimeReport("finish");
 843
 844         if (r_textureunits.integer > gl_textureunits)
 845                 Cvar_SetValueQuick(&r_textureunits, gl_textureunits);
 846         if (r_textureunits.integer < 1)
 847                 Cvar_SetValueQuick(&r_textureunits, 1);
 848
 849         if (gl_combine.integer && (!gl_combine_extension || r_textureunits.integer < 2))
 850                 Cvar_SetValueQuick(&gl_combine, 0);
 851
 852         // lighting scale
 853         overbrightscale = 1.0f / (float) (1 << v_overbrightbits.integer);
 854
 855         // lightmaps only
 856         lightscalebit = v_overbrightbits.integer;
 857         if (gl_combine.integer && r_textureunits.integer > 1)
 858                 lightscalebit += 2;
 859         lightscale = 1.0f / (float) (1 << lightscalebit);
 860
 861         R_TimeReport("setup");
 862
 863         R_ClearScreen();
 864
 865         R_TimeReport("clear");
 866
 867         if (scr_conlines < vid.conheight && cls.signon == SIGNONS)
 868                 R_RenderView();
 869
 870         // draw 2D stuff
 871         R_DrawQueue();
 872
 873         // tell driver to commit it's partially full geometry queue to the rendering queue
 874         // (this doesn't wait for the commands themselves to complete)
 875         qglFlush();
 876 }
 877