gl_backend.c

   1
   2 #include "quakedef.h"
   3
   4 cvar_t gl_mesh_maxtriangles = {0, "gl_mesh_maxtriangles", "1024"};
   5 cvar_t gl_mesh_floatcolors = {0, "gl_mesh_floatcolors", "1"};
   6 cvar_t gl_mesh_drawmode = {CVAR_SAVE, "gl_mesh_drawmode", "3"};
   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 // this is used to increase gl_mesh_maxtriangles automatically if a mesh was
  13 // too large for the buffers in the previous frame
  14 int overflowedverts = 0;
  15
  16 int gl_maxdrawrangeelementsvertices;
  17 int gl_maxdrawrangeelementsindices;
  18
  19 #ifdef DEBUGGL
  20 int errornumber = 0;
  21
  22 void GL_PrintError(int errornumber, char *filename, int linenumber)
  23 {
  24         switch(errornumber)
  25         {
  26 #ifdef GL_INVALID_ENUM
  27         case GL_INVALID_ENUM:
  28                 Con_Printf("GL_INVALID_ENUM at %s:%i\n", filename, linenumber);
  29                 break;
  30 #endif
  31 #ifdef GL_INVALID_VALUE
  32         case GL_INVALID_VALUE:
  33                 Con_Printf("GL_INVALID_VALUE at %s:%i\n", filename, linenumber);
  34                 break;
  35 #endif
  36 #ifdef GL_INVALID_OPERATION
  37         case GL_INVALID_OPERATION:
  38                 Con_Printf("GL_INVALID_OPERATION at %s:%i\n", filename, linenumber);
  39                 break;
  40 #endif
  41 #ifdef GL_STACK_OVERFLOW
  42         case GL_STACK_OVERFLOW:
  43                 Con_Printf("GL_STACK_OVERFLOW at %s:%i\n", filename, linenumber);
  44                 break;
  45 #endif
  46 #ifdef GL_STACK_UNDERFLOW
  47         case GL_STACK_UNDERFLOW:
  48                 Con_Printf("GL_STACK_UNDERFLOW at %s:%i\n", filename, linenumber);
  49                 break;
  50 #endif
  51 #ifdef GL_OUT_OF_MEMORY
  52         case GL_OUT_OF_MEMORY:
  53                 Con_Printf("GL_OUT_OF_MEMORY at %s:%i\n", filename, linenumber);
  54                 break;
  55 #endif
  56 #ifdef GL_TABLE_TOO_LARGE
  57     case GL_TABLE_TOO_LARGE:
  58                 Con_Printf("GL_TABLE_TOO_LARGE at %s:%i\n", filename, linenumber);
  59                 break;
  60 #endif
  61         default:
  62                 Con_Printf("GL UNKNOWN (%i) at %s:%i\n", errornumber, filename, linenumber);
  63                 break;
  64         }
  65 }
  66 #endif
  67
  68 #define BACKENDACTIVECHECK if (!backendactive) Sys_Error("GL backend function called when backend is not active\n");
  69
  70 float r_mesh_farclip;
  71
  72 static float viewdist;
  73 // sign bits (true if negative) for vpn[] entries, so quick integer compares can be used instead of float compares
  74 static int vpnbit0, vpnbit1, vpnbit2;
  75
  76 int c_meshs, c_meshtris;
  77
  78 int lightscalebit;
  79 float lightscale;
  80 float overbrightscale;
  81
  82 void SCR_ScreenShot_f (void);
  83
  84 // these are externally accessible
  85 float mesh_colorscale;
  86 int *varray_element;
  87 float *varray_vertex;
  88 float *varray_color;
  89 float *varray_texcoord[MAX_TEXTUREUNITS];
  90 int mesh_maxtris;
  91 int mesh_maxverts; // always mesh_maxtris * 3
  92
  93 static matrix4x4_t backend_viewmatrix;
  94 static matrix4x4_t backend_modelmatrix;
  95 static matrix4x4_t backend_modelviewmatrix;
  96 static matrix4x4_t backend_glmodelviewmatrix;
  97
  98 static int backendunits, backendactive;
  99 static qbyte *varray_bcolor;
 100 static mempool_t *gl_backend_mempool;
 101
 102 void GL_Backend_AllocArrays(void)
 103 {
 104         int i;
 105
 106         if (!gl_backend_mempool)
 107                 gl_backend_mempool = Mem_AllocPool("GL_Backend");
 108
 109         mesh_maxverts = mesh_maxtris * 3;
 110
 111         varray_element = Mem_Alloc(gl_backend_mempool, mesh_maxtris * sizeof(int[3]));
 112         varray_vertex = Mem_Alloc(gl_backend_mempool, mesh_maxverts * sizeof(float[4]));
 113         varray_color = Mem_Alloc(gl_backend_mempool, mesh_maxverts * sizeof(float[4]));
 114         varray_bcolor = Mem_Alloc(gl_backend_mempool, mesh_maxverts * sizeof(qbyte[4]));
 115         for (i = 0;i < backendunits;i++)
 116                 varray_texcoord[i] = Mem_Alloc(gl_backend_mempool, mesh_maxverts * sizeof(float[2]));
 117         for (;i < MAX_TEXTUREUNITS;i++)
 118                 varray_texcoord[i] = NULL;
 119 }
 120
 121 void GL_Backend_FreeArrays(int resizingbuffers)
 122 {
 123         int i;
 124         if (resizingbuffers)
 125                 Mem_EmptyPool(gl_backend_mempool);
 126         else
 127                 Mem_FreePool(&gl_backend_mempool);
 128         varray_element = NULL;
 129         varray_vertex = NULL;
 130         varray_color = NULL;
 131         varray_bcolor = NULL;
 132         for (i = 0;i < MAX_TEXTUREUNITS;i++)
 133                 varray_texcoord[i] = NULL;
 134 }
 135
 136 static void gl_backend_start(void)
 137 {
 138         Con_Printf("OpenGL Backend started with gl_mesh_maxtriangles %i\n", gl_mesh_maxtriangles.integer);
 139         if (qglDrawRangeElements != NULL)
 140         {
 141                 qglGetIntegerv(GL_MAX_ELEMENTS_VERTICES, &gl_maxdrawrangeelementsvertices);
 142                 qglGetIntegerv(GL_MAX_ELEMENTS_INDICES, &gl_maxdrawrangeelementsindices);
 143                 CHECKGLERROR
 144                 Con_Printf("glDrawRangeElements detected (max vertices %i, max indices %i)\n", gl_maxdrawrangeelementsvertices, gl_maxdrawrangeelementsindices);
 145         }
 146         if (strstr(gl_renderer, "3Dfx"))
 147         {
 148                 Con_Printf("3Dfx driver detected, forcing gl_mesh_floatcolors to 0 to prevent crashs\n");
 149                 Cvar_SetValueQuick(&gl_mesh_floatcolors, 0);
 150         }
 151
 152         backendunits = min(MAX_TEXTUREUNITS, gl_textureunits);
 153
 154         GL_Backend_AllocArrays();
 155
 156         backendactive = true;
 157 }
 158
 159 static void gl_backend_shutdown(void)
 160 {
 161         backendunits = 0;
 162         backendactive = false;
 163
 164         Con_Printf("OpenGL Backend shutting down\n");
 165
 166         GL_Backend_FreeArrays(false);
 167 }
 168
 169 void GL_Backend_CheckCvars(void)
 170 {
 171         if (gl_mesh_drawmode.integer < 0)
 172                 Cvar_SetValueQuick(&gl_mesh_drawmode, 0);
 173         if (gl_mesh_drawmode.integer > 3)
 174                 Cvar_SetValueQuick(&gl_mesh_drawmode, 3);
 175
 176         // change drawmode 3 to 2 if 3 won't work
 177         if (gl_mesh_drawmode.integer >= 3 && qglDrawRangeElements == NULL)
 178                 Cvar_SetValueQuick(&gl_mesh_drawmode, 2);
 179
 180         // 21760 is (65536 / 3) rounded off to a multiple of 128
 181         if (gl_mesh_maxtriangles.integer < 1024)
 182                 Cvar_SetValueQuick(&gl_mesh_maxtriangles, 1024);
 183         if (gl_mesh_maxtriangles.integer > 21760)
 184                 Cvar_SetValueQuick(&gl_mesh_maxtriangles, 21760);
 185 }
 186
 187 void GL_Backend_ResizeArrays(int numtriangles)
 188 {
 189         Cvar_SetValueQuick(&gl_mesh_maxtriangles, numtriangles);
 190         GL_Backend_CheckCvars();
 191         mesh_maxtris = gl_mesh_maxtriangles.integer;
 192         GL_Backend_FreeArrays(true);
 193         GL_Backend_AllocArrays();
 194 }
 195
 196 static void gl_backend_newmap(void)
 197 {
 198 }
 199
 200 void gl_backend_init(void)
 201 {
 202         Cvar_RegisterVariable(&r_render);
 203         Cvar_RegisterVariable(&gl_dither);
 204         Cvar_RegisterVariable(&gl_lockarrays);
 205 #ifdef NORENDER
 206         Cvar_SetValue("r_render", 0);
 207 #endif
 208
 209         Cvar_RegisterVariable(&gl_mesh_maxtriangles);
 210         Cvar_RegisterVariable(&gl_mesh_floatcolors);
 211         Cvar_RegisterVariable(&gl_mesh_drawmode);
 212         GL_Backend_CheckCvars();
 213         R_RegisterModule("GL_Backend", gl_backend_start, gl_backend_shutdown, gl_backend_newmap);
 214 }
 215
 216 int arraylocked = false;
 217
 218 void GL_LockArray(int first, int count)
 219 {
 220         if (!arraylocked && gl_supportslockarrays && gl_lockarrays.integer && gl_mesh_drawmode.integer > 0)
 221         {
 222                 qglLockArraysEXT(first, count);
 223                 CHECKGLERROR
 224                 arraylocked = true;
 225         }
 226 }
 227
 228 void GL_UnlockArray(void)
 229 {
 230         if (arraylocked)
 231         {
 232                 qglUnlockArraysEXT();
 233                 CHECKGLERROR
 234                 arraylocked = false;
 235         }
 236 }
 237
 238 /*
 239 =============
 240 GL_SetupFrame
 241 =============
 242 */
 243 static void GL_SetupFrame (void)
 244 {
 245         double xmax, ymax;
 246         double fovx, fovy, zNear, zFar, aspect;
 247
 248         if (!r_render.integer)
 249                 return;
 250
 251         qglDepthFunc (GL_LEQUAL);CHECKGLERROR
 252
 253         // set up viewpoint
 254         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 255         qglLoadIdentity ();CHECKGLERROR
 256
 257         // y is weird beause OpenGL is bottom to top, we use top to bottom
 258         qglViewport(r_refdef.x, vid.realheight - (r_refdef.y + r_refdef.height), r_refdef.width, r_refdef.height);CHECKGLERROR
 259
 260         // depth range
 261         zNear = 1.0;
 262         zFar = r_mesh_farclip;
 263         if (zFar < 64)
 264                 zFar = 64;
 265
 266         // fov angles
 267         fovx = r_refdef.fov_x;
 268         fovy = r_refdef.fov_y;
 269         aspect = r_refdef.width / r_refdef.height;
 270
 271         // pyramid slopes
 272         xmax = zNear * tan(fovx * M_PI / 360.0) * aspect;
 273         ymax = zNear * tan(fovy * M_PI / 360.0);
 274
 275         // set view pyramid
 276         qglFrustum(-xmax, xmax, -ymax, ymax, zNear, zFar);CHECKGLERROR
 277
 278         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 279
 280         Matrix4x4_CreateRotate(&backend_viewmatrix, -90, 1, 0, 0);
 281         Matrix4x4_ConcatRotate(&backend_viewmatrix, 90, 0, 0, 1);
 282         Matrix4x4_ConcatRotate(&backend_viewmatrix, -r_refdef.viewangles[2], 1, 0, 0);
 283         Matrix4x4_ConcatRotate(&backend_viewmatrix, -r_refdef.viewangles[0], 0, 1, 0);
 284         Matrix4x4_ConcatRotate(&backend_viewmatrix, -r_refdef.viewangles[1], 0, 0, 1);
 285         Matrix4x4_ConcatTranslate(&backend_viewmatrix, -r_refdef.vieworg[0],  -r_refdef.vieworg[1],  -r_refdef.vieworg[2]);
 286         //Con_Printf("Our Matrix:\n");
 287         //Matrix4x4_Print(&backend_viewmatrix);
 288
 289         //Matrix4x4_Transpose(&backend_glmodelviewmatrix, &backend_viewmatrix);
 290         //qglLoadMatrixf(&backend_glmodelviewmatrix.m[0][0]);CHECKGLERROR
 291         memset(&backend_modelmatrix, 0, sizeof(backend_modelmatrix));
 292
 293         /*
 294         // put Z going up
 295         qglLoadIdentity ();CHECKGLERROR
 296         qglRotatef (-90,  1, 0, 0);CHECKGLERROR
 297         qglRotatef (90,  0, 0, 1);CHECKGLERROR
 298         // camera rotation
 299         qglRotatef (-r_refdef.viewangles[2],  1, 0, 0);CHECKGLERROR
 300         qglRotatef (-r_refdef.viewangles[0],  0, 1, 0);CHECKGLERROR
 301         qglRotatef (-r_refdef.viewangles[1],  0, 0, 1);CHECKGLERROR
 302         // camera location
 303         qglTranslatef (-r_refdef.vieworg[0],  -r_refdef.vieworg[1],  -r_refdef.vieworg[2]);CHECKGLERROR
 304         qglGetFloatv (GL_MODELVIEW_MATRIX, &gl_viewmatrix.m[0][0]);
 305         Matrix4x4_Transpose(&backend_viewmatrix, &gl_viewmatrix);
 306         Con_Printf("GL Matrix:\n");
 307         Matrix4x4_Print(&backend_viewmatrix);
 308         */
 309 }
 310
 311 static struct
 312 {
 313         int blendfunc1;
 314         int blendfunc2;
 315         int blend;
 316         GLboolean depthmask;
 317         int depthdisable;
 318         int unit;
 319         int clientunit;
 320         int texture[MAX_TEXTUREUNITS];
 321         float texturergbscale[MAX_TEXTUREUNITS];
 322 }
 323 gl_state;
 324
 325 void GL_SetupTextureState(void)
 326 {
 327         int i;
 328         if (backendunits > 1)
 329         {
 330                 for (i = 0;i < backendunits;i++)
 331                 {
 332                         qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 333                         qglBindTexture(GL_TEXTURE_2D, gl_state.texture[i]);CHECKGLERROR
 334                         if (gl_combine.integer)
 335                         {
 336                                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);CHECKGLERROR
 337                                 qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_MODULATE);CHECKGLERROR
 338                                 qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE);CHECKGLERROR
 339                                 qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 340                                 qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_RGB_ARB, GL_CONSTANT_ARB);CHECKGLERROR
 341                                 qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 342                                 qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 343                                 qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_RGB_ARB, GL_SRC_ALPHA);CHECKGLERROR
 344                                 qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, GL_MODULATE);CHECKGLERROR
 345                                 qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA_ARB, GL_TEXTURE);CHECKGLERROR
 346                                 qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_ALPHA_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 347                                 qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_ALPHA_ARB, GL_CONSTANT_ARB);CHECKGLERROR
 348                                 qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 349                                 qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 350                                 qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 351                                 qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, gl_state.texturergbscale[i]);CHECKGLERROR
 352                                 qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
 353                         }
 354                         else
 355                         {
 356                                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 357                         }
 358                         if (gl_state.texture[i])
 359                         {
 360                                 qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 361                         }
 362                         else
 363                         {
 364                                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 365                         }
 366                         if (gl_mesh_drawmode.integer > 0)
 367                         {
 368                                 qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 369                                 qglTexCoordPointer(2, GL_FLOAT, sizeof(float[2]), varray_texcoord[i]);CHECKGLERROR
 370                                 if (gl_state.texture[i])
 371                                 {
 372                                         qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 373                                 }
 374                                 else
 375                                 {
 376                                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 377                                 }
 378                         }
 379                 }
 380         }
 381         else
 382         {
 383                 qglBindTexture(GL_TEXTURE_2D, gl_state.texture[0]);CHECKGLERROR
 384                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 385                 if (gl_state.texture[0])
 386                 {
 387                         qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 388                 }
 389                 else
 390                 {
 391                         qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 392                 }
 393                 if (gl_mesh_drawmode.integer > 0)
 394                 {
 395                         qglTexCoordPointer(2, GL_FLOAT, sizeof(float[2]), varray_texcoord[0]);CHECKGLERROR
 396                         if (gl_state.texture[0])
 397                         {
 398                                 qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 399                         }
 400                         else
 401                         {
 402                                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 403                         }
 404                 }
 405         }
 406 }
 407
 408 int usedarrays;
 409 void GL_Backend_ResetState(void)
 410 {
 411         int i;
 412         gl_state.unit = 0;
 413         gl_state.clientunit = 0;
 414
 415         for (i = 0;i < backendunits;i++)
 416         {
 417                 gl_state.texture[i] = 0;
 418                 gl_state.texturergbscale[i] = 1;
 419         }
 420
 421         qglEnable(GL_CULL_FACE);CHECKGLERROR
 422         qglCullFace(GL_FRONT);CHECKGLERROR
 423
 424         gl_state.depthdisable = false;
 425         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 426
 427         gl_state.blendfunc1 = GL_ONE;
 428         gl_state.blendfunc2 = GL_ZERO;
 429         qglBlendFunc(gl_state.blendfunc1, gl_state.blendfunc2);CHECKGLERROR
 430
 431         gl_state.blend = 0;
 432         qglDisable(GL_BLEND);CHECKGLERROR
 433
 434         gl_state.depthmask = GL_TRUE;
 435         qglDepthMask(gl_state.depthmask);CHECKGLERROR
 436
 437         usedarrays = false;
 438         if (gl_mesh_drawmode.integer > 0)
 439         {
 440                 usedarrays = true;
 441                 qglVertexPointer(3, GL_FLOAT, sizeof(float[4]), varray_vertex);CHECKGLERROR
 442                 qglEnableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 443                 if (gl_mesh_floatcolors.integer)
 444                 {
 445                         qglColorPointer(4, GL_FLOAT, sizeof(float[4]), varray_color);CHECKGLERROR
 446                 }
 447                 else
 448                 {
 449                         qglColorPointer(4, GL_UNSIGNED_BYTE, sizeof(qbyte[4]), varray_bcolor);CHECKGLERROR
 450                 }
 451                 qglEnableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 452         }
 453
 454         GL_SetupTextureState();
 455 }
 456
 457 // called at beginning of frame
 458 void R_Mesh_Start(float farclip)
 459 {
 460         BACKENDACTIVECHECK
 461
 462         CHECKGLERROR
 463
 464         r_mesh_farclip = farclip;
 465         viewdist = DotProduct(r_origin, vpn);
 466         vpnbit0 = vpn[0] < 0;
 467         vpnbit1 = vpn[1] < 0;
 468         vpnbit2 = vpn[2] < 0;
 469
 470         c_meshs = 0;
 471         c_meshtris = 0;
 472
 473         GL_Backend_CheckCvars();
 474         if (mesh_maxtris != gl_mesh_maxtriangles.integer)
 475                 GL_Backend_ResizeArrays(gl_mesh_maxtriangles.integer);
 476
 477         GL_SetupFrame();
 478
 479         GL_Backend_ResetState();
 480 }
 481
 482 int gl_backend_rebindtextures;
 483
 484 void GL_ConvertColorsFloatToByte(int numverts)
 485 {
 486         int i, k, total;
 487         // LordHavoc: to avoid problems with aliasing (treating memory as two
 488         // different types - exactly what this is doing), these must be volatile
 489         // (or a union)
 490         volatile int *icolor;
 491         volatile float *fcolor;
 492         qbyte *bcolor;
 493
 494         total = numverts * 4;
 495
 496         // shift float to have 8bit fraction at base of number
 497         fcolor = varray_color;
 498         for (i = 0;i < total;)
 499         {
 500                 fcolor[i    ] += 32768.0f;
 501                 fcolor[i + 1] += 32768.0f;
 502                 fcolor[i + 2] += 32768.0f;
 503                 fcolor[i + 3] += 32768.0f;
 504                 i += 4;
 505         }
 506
 507         // then read as integer and kill float bits...
 508         icolor = (int *)varray_color;
 509         bcolor = varray_bcolor;
 510         for (i = 0;i < total;)
 511         {
 512                 k = icolor[i    ] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i    ] = (qbyte) k;
 513                 k = icolor[i + 1] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i + 1] = (qbyte) k;
 514                 k = icolor[i + 2] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i + 2] = (qbyte) k;
 515                 k = icolor[i + 3] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i + 3] = (qbyte) k;
 516                 i += 4;
 517         }
 518 }
 519
 520 /*
 521 void GL_TransformVertices(int numverts)
 522 {
 523         int i;
 524         float m[12], tempv[4], *v;
 525         m[0] = backendmatrix.m[0][0];
 526         m[1] = backendmatrix.m[0][1];
 527         m[2] = backendmatrix.m[0][2];
 528         m[3] = backendmatrix.m[0][3];
 529         m[4] = backendmatrix.m[1][0];
 530         m[5] = backendmatrix.m[1][1];
 531         m[6] = backendmatrix.m[1][2];
 532         m[7] = backendmatrix.m[1][3];
 533         m[8] = backendmatrix.m[2][0];
 534         m[9] = backendmatrix.m[2][1];
 535         m[10] = backendmatrix.m[2][2];
 536         m[11] = backendmatrix.m[2][3];
 537         for (i = 0, v = varray_vertex;i < numverts;i++, v += 4)
 538         {
 539                 VectorCopy(v, tempv);
 540                 v[0] = tempv[0] * m[0] + tempv[1] * m[1] + tempv[2] * m[2] + m[3];
 541                 v[1] = tempv[0] * m[4] + tempv[1] * m[5] + tempv[2] * m[6] + m[7];
 542                 v[2] = tempv[0] * m[8] + tempv[1] * m[9] + tempv[2] * m[10] + m[11];
 543         }
 544 }
 545 */
 546
 547 void GL_DrawRangeElements(int firstvert, int endvert, int indexcount, GLuint *index)
 548 {
 549         unsigned int i, j, in;
 550         qbyte *c;
 551         float *v;
 552         GL_LockArray(firstvert, endvert - firstvert);
 553         if (gl_mesh_drawmode.integer >= 3/* && (endvert - firstvert) <= gl_maxdrawrangeelementsvertices && (indexcount) <= gl_maxdrawrangeelementsindices*/)
 554         {
 555                 // GL 1.2 or GL 1.1 with extension
 556                 qglDrawRangeElements(GL_TRIANGLES, firstvert, endvert, indexcount, GL_UNSIGNED_INT, index);
 557                 CHECKGLERROR
 558         }
 559         else if (gl_mesh_drawmode.integer >= 2)
 560         {
 561                 // GL 1.1
 562                 qglDrawElements(GL_TRIANGLES, indexcount, GL_UNSIGNED_INT, index);
 563                 CHECKGLERROR
 564         }
 565         else if (gl_mesh_drawmode.integer >= 1)
 566         {
 567                 // GL 1.1
 568                 // feed it manually using glArrayElement
 569                 qglBegin(GL_TRIANGLES);
 570                 for (i = 0;i < indexcount;i++)
 571                         qglArrayElement(index[i]);
 572                 qglEnd();
 573                 CHECKGLERROR
 574         }
 575         else
 576         {
 577                 // GL 1.1 but not using vertex arrays - 3dfx glquake minigl driver
 578                 // feed it manually
 579                 qglBegin(GL_TRIANGLES);
 580                 if (gl_state.texture[1]) // if the mesh uses multiple textures
 581                 {
 582                         // the minigl doesn't have this (because it does not have ARB_multitexture)
 583                         for (i = 0;i < indexcount;i++)
 584                         {
 585                                 in = index[i];
 586                                 c = varray_bcolor + in * 4;
 587                                 qglColor4ub(c[0], c[1], c[2], c[3]);
 588                                 for (j = 0;j < backendunits;j++)
 589                                 {
 590                                         if (gl_state.texture[j])
 591                                         {
 592                                                 v = varray_texcoord[j] + in * 2;
 593                                                 qglMultiTexCoord2f(GL_TEXTURE0_ARB + j, v[0], v[1]);
 594                                         }
 595                                 }
 596                                 v = varray_vertex + in * 4;
 597                                 qglVertex3f(v[0], v[1], v[2]);
 598                         }
 599                 }
 600                 else
 601                 {
 602                         for (i = 0;i < indexcount;i++)
 603                         {
 604                                 in = index[i];
 605                                 c = varray_bcolor + in * 4;
 606                                 qglColor4ub(c[0], c[1], c[2], c[3]);
 607                                 if (gl_state.texture[0])
 608                                 {
 609                                         v = varray_texcoord[0] + in * 2;
 610                                         qglTexCoord2f(v[0], v[1]);
 611                                 }
 612                                 v = varray_vertex + in * 4;
 613                                 qglVertex3f(v[0], v[1], v[2]);
 614                         }
 615                 }
 616                 qglEnd();
 617                 CHECKGLERROR
 618         }
 619         GL_UnlockArray();
 620 }
 621
 622 // enlarges geometry buffers if they are too small
 623 void _R_Mesh_ResizeCheck(int numverts, int numtriangles)
 624 {
 625         if (numtriangles > mesh_maxtris || numverts > mesh_maxverts)
 626         {
 627                 BACKENDACTIVECHECK
 628                 GL_Backend_ResizeArrays(max(numtriangles, (numverts + 2) / 3) + 100);
 629                 GL_Backend_ResetState();
 630         }
 631 }
 632
 633 // renders the mesh
 634 void R_Mesh_Draw(int numverts, int numtriangles)
 635 {
 636         BACKENDACTIVECHECK
 637
 638         c_meshs++;
 639         c_meshtris += numtriangles;
 640
 641         CHECKGLERROR
 642
 643         // drawmode 0 always uses byte colors
 644         if (!gl_mesh_floatcolors.integer || gl_mesh_drawmode.integer <= 0)
 645                 GL_ConvertColorsFloatToByte(numverts);
 646         //GL_TransformVertices(numverts);
 647         if (!r_render.integer)
 648                 return;
 649         GL_DrawRangeElements(0, numverts, numtriangles * 3, varray_element);
 650 }
 651
 652 // restores backend state, used when done with 3D rendering
 653 void R_Mesh_Finish(void)
 654 {
 655         int i;
 656         BACKENDACTIVECHECK
 657
 658         if (backendunits > 1)
 659         {
 660                 for (i = backendunits - 1;i >= 0;i--)
 661                 {
 662                         qglActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
 663                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 664                         if (gl_combine.integer)
 665                         {
 666                                 qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
 667                         }
 668                         if (i > 0)
 669                         {
 670                                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 671                         }
 672                         else
 673                         {
 674                                 qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 675                         }
 676                         qglBindTexture(GL_TEXTURE_2D, 0);CHECKGLERROR
 677
 678                         if (usedarrays)
 679                         {
 680                                 qglClientActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
 681                                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 682                         }
 683                 }
 684         }
 685         else
 686         {
 687                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 688                 qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 689                 if (usedarrays)
 690                 {
 691                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 692                 }
 693         }
 694         if (usedarrays)
 695         {
 696                 qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 697                 qglDisableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 698         }
 699
 700         qglDisable(GL_BLEND);CHECKGLERROR
 701         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 702         qglDepthMask(GL_TRUE);CHECKGLERROR
 703         qglBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);CHECKGLERROR
 704 }
 705
 706 void R_Mesh_ClearDepth(void)
 707 {
 708         BACKENDACTIVECHECK
 709
 710         R_Mesh_Finish();
 711         qglClear(GL_DEPTH_BUFFER_BIT);
 712         R_Mesh_Start(r_mesh_farclip);
 713 }
 714
 715 void R_Mesh_Matrix(const matrix4x4_t *matrix)
 716 {
 717         if (memcmp(matrix, &backend_modelmatrix, sizeof(matrix4x4_t)))
 718         {
 719                 backend_modelmatrix = *matrix;
 720                 Matrix4x4_Concat(&backend_modelviewmatrix, &backend_viewmatrix, matrix);
 721                 Matrix4x4_Transpose(&backend_glmodelviewmatrix, &backend_modelviewmatrix);
 722                 qglLoadMatrixf(&backend_glmodelviewmatrix.m[0][0]);
 723         }
 724 }
 725
 726 // sets up the requested state
 727 void R_Mesh_State(const rmeshstate_t *m)
 728 {
 729         int i, overbright;
 730         int texturergbscale[MAX_TEXTUREUNITS];
 731         float scaler;
 732
 733         BACKENDACTIVECHECK
 734
 735         if (gl_backend_rebindtextures)
 736         {
 737                 gl_backend_rebindtextures = false;
 738                 GL_SetupTextureState();
 739         }
 740
 741         overbright = false;
 742         scaler = 1;
 743         if (m->blendfunc1 == GL_DST_COLOR)
 744         {
 745                 // check if it is a 2x modulate with framebuffer
 746                 if (m->blendfunc2 == GL_SRC_COLOR)
 747                         scaler *= 0.5f;
 748         }
 749         else if (m->blendfunc2 != GL_SRC_COLOR)
 750         {
 751                 if (m->tex[0])
 752                 {
 753                         overbright = m->wantoverbright && gl_combine.integer;
 754                         if (overbright)
 755                                 scaler *= 0.25f;
 756                 }
 757                 scaler *= overbrightscale;
 758         }
 759         mesh_colorscale = scaler;
 760
 761         if (gl_state.blendfunc1 != m->blendfunc1 || gl_state.blendfunc2 != m->blendfunc2)
 762         {
 763                 qglBlendFunc(gl_state.blendfunc1 = m->blendfunc1, gl_state.blendfunc2 = m->blendfunc2);CHECKGLERROR
 764                 if (gl_state.blendfunc2 == GL_ZERO)
 765                 {
 766                         if (gl_state.blendfunc1 == GL_ONE)
 767                         {
 768                                 if (gl_state.blend)
 769                                 {
 770                                         gl_state.blend = 0;
 771                                         qglDisable(GL_BLEND);CHECKGLERROR
 772                                 }
 773                         }
 774                         else
 775                         {
 776                                 if (!gl_state.blend)
 777                                 {
 778                                         gl_state.blend = 1;
 779                                         qglEnable(GL_BLEND);CHECKGLERROR
 780                                 }
 781                         }
 782                 }
 783                 else
 784                 {
 785                         if (!gl_state.blend)
 786                         {
 787                                 gl_state.blend = 1;
 788                                 qglEnable(GL_BLEND);CHECKGLERROR
 789                         }
 790                 }
 791         }
 792         if (gl_state.depthdisable != m->depthdisable)
 793         {
 794                 gl_state.depthdisable = m->depthdisable;
 795                 if (gl_state.depthdisable)
 796                         qglDisable(GL_DEPTH_TEST);
 797                 else
 798                         qglEnable(GL_DEPTH_TEST);
 799         }
 800         if (gl_state.depthmask != (m->blendfunc2 == GL_ZERO || m->depthwrite))
 801         {
 802                 qglDepthMask(gl_state.depthmask = (m->blendfunc2 == GL_ZERO || m->depthwrite));CHECKGLERROR
 803         }
 804
 805         for (i = 0;i < backendunits;i++)
 806         {
 807                 if (m->texrgbscale[i])
 808                         texturergbscale[i] = m->texrgbscale[i];
 809                 else
 810                         texturergbscale[i] = 1;
 811         }
 812         if (overbright)
 813                 for (i = backendunits - 1;i >= 0;i--)
 814                         if (m->tex[i])
 815                                 texturergbscale[i] = 4;
 816
 817         if (backendunits > 1)
 818         {
 819                 for (i = 0;i < backendunits;i++)
 820                 {
 821                         if (gl_state.texture[i] != m->tex[i])
 822                         {
 823                                 if (gl_state.unit != i)
 824                                 {
 825                                         qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 826                                 }
 827                                 if (gl_state.texture[i] == 0)
 828                                 {
 829                                         qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 830                                         if (gl_state.clientunit != i)
 831                                         {
 832                                                 qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 833                                         }
 834                                         qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 835                                 }
 836                                 qglBindTexture(GL_TEXTURE_2D, (gl_state.texture[i] = m->tex[i]));CHECKGLERROR
 837                                 if (gl_state.texture[i] == 0)
 838                                 {
 839                                         qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 840                                         if (gl_state.clientunit != i)
 841                                         {
 842                                                 qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 843                                         }
 844                                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 845                                 }
 846                         }
 847                         if (gl_state.texturergbscale[i] != texturergbscale[i])
 848                         {
 849                                 if (gl_state.unit != i)
 850                                 {
 851                                         qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 852                                 }
 853                                 qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, (gl_state.texturergbscale[i] = texturergbscale[i]));CHECKGLERROR
 854                         }
 855                 }
 856         }
 857         else
 858         {
 859                 if (gl_state.texture[0] != m->tex[0])
 860                 {
 861                         if (gl_state.texture[0] == 0)
 862                         {
 863                                 qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 864                                 qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 865                         }
 866                         qglBindTexture(GL_TEXTURE_2D, (gl_state.texture[0] = m->tex[0]));CHECKGLERROR
 867                         if (gl_state.texture[0] == 0)
 868                         {
 869                                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 870                                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 871                         }
 872                 }
 873         }
 874 }
 875
 876 /*
 877 ==============================================================================
 878
 879                                                 SCREEN SHOTS
 880
 881 ==============================================================================
 882 */
 883
 884 qboolean SCR_ScreenShot(char *filename, int x, int y, int width, int height)
 885 {
 886         qboolean ret;
 887         int i;
 888         qbyte *buffer;
 889
 890         if (!r_render.integer)
 891                 return false;
 892
 893         buffer = Mem_Alloc(tempmempool, width*height*3);
 894         qglReadPixels (x, y, width, height, GL_RGB, GL_UNSIGNED_BYTE, buffer);
 895         CHECKGLERROR
 896
 897         // LordHavoc: compensate for v_overbrightbits when using hardware gamma
 898         if (v_hwgamma.integer)
 899                 for (i = 0;i < width * height * 3;i++)
 900                         buffer[i] <<= v_overbrightbits.integer;
 901
 902         ret = Image_WriteTGARGB_preflipped(filename, width, height, buffer);
 903
 904         Mem_Free(buffer);
 905         return ret;
 906 }
 907
 908 //=============================================================================
 909
 910 void R_ClearScreen(void)
 911 {
 912         if (r_render.integer)
 913         {
 914                 // clear to black
 915                 qglClearColor(0,0,0,0);CHECKGLERROR
 916                 // clear the screen
 917                 qglClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);CHECKGLERROR
 918                 // set dithering mode
 919                 if (gl_dither.integer)
 920                 {
 921                         qglEnable(GL_DITHER);CHECKGLERROR
 922                 }
 923                 else
 924                 {
 925                         qglDisable(GL_DITHER);CHECKGLERROR
 926                 }
 927         }
 928 }
 929
 930 /*
 931 ==================
 932 SCR_UpdateScreen
 933
 934 This is called every frame, and can also be called explicitly to flush
 935 text to the screen.
 936 ==================
 937 */
 938 void SCR_UpdateScreen (void)
 939 {
 940         VID_Finish ();
 941
 942         R_TimeReport("finish");
 943
 944         if (r_textureunits.integer > gl_textureunits)
 945                 Cvar_SetValueQuick(&r_textureunits, gl_textureunits);
 946         if (r_textureunits.integer < 1)
 947                 Cvar_SetValueQuick(&r_textureunits, 1);
 948
 949         if (gl_combine.integer && (!gl_combine_extension || r_textureunits.integer < 2))
 950                 Cvar_SetValueQuick(&gl_combine, 0);
 951
 952         // lighting scale
 953         overbrightscale = 1.0f / (float) (1 << v_overbrightbits.integer);
 954
 955         // lightmaps only
 956         lightscalebit = v_overbrightbits.integer;
 957         if (gl_combine.integer && r_textureunits.integer > 1)
 958                 lightscalebit += 2;
 959         lightscale = 1.0f / (float) (1 << lightscalebit);
 960
 961         R_TimeReport("setup");
 962
 963         R_ClearScreen();
 964
 965         R_TimeReport("clear");
 966
 967         if (scr_conlines < vid.conheight && cls.signon == SIGNONS)
 968                 R_RenderView();
 969
 970         // draw 2D stuff
 971         R_DrawQueue();
 972
 973         // tell driver to commit it's partially full geometry queue to the rendering queue
 974         // (this doesn't wait for the commands themselves to complete)
 975         qglFlush();
 976 }
 977