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