gl_backend.c

   1
   2 #include "quakedef.h"
   3 #include "image.h"
   4
   5 cvar_t gl_mesh_maxverts = {0, "gl_mesh_maxverts", "1024"};
   6 cvar_t gl_mesh_floatcolors = {0, "gl_mesh_floatcolors", "1"};
   7 cvar_t gl_mesh_drawrangeelements = {0, "gl_mesh_drawrangeelements", "1"};
   8
   9 cvar_t r_render = {0, "r_render", "1"};
  10 cvar_t gl_dither = {CVAR_SAVE, "gl_dither", "1"}; // whether or not to use dithering
  11 cvar_t gl_lockarrays = {0, "gl_lockarrays", "1"};
  12
  13 int gl_maxdrawrangeelementsvertices;
  14 int gl_maxdrawrangeelementsindices;
  15
  16 #ifdef DEBUGGL
  17 int errornumber = 0;
  18
  19 void GL_PrintError(int errornumber, char *filename, int linenumber)
  20 {
  21         switch(errornumber)
  22         {
  23 #ifdef GL_INVALID_ENUM
  24         case GL_INVALID_ENUM:
  25                 Con_Printf("GL_INVALID_ENUM at %s:%i\n", filename, linenumber);
  26                 break;
  27 #endif
  28 #ifdef GL_INVALID_VALUE
  29         case GL_INVALID_VALUE:
  30                 Con_Printf("GL_INVALID_VALUE at %s:%i\n", filename, linenumber);
  31                 break;
  32 #endif
  33 #ifdef GL_INVALID_OPERATION
  34         case GL_INVALID_OPERATION:
  35                 Con_Printf("GL_INVALID_OPERATION at %s:%i\n", filename, linenumber);
  36                 break;
  37 #endif
  38 #ifdef GL_STACK_OVERFLOW
  39         case GL_STACK_OVERFLOW:
  40                 Con_Printf("GL_STACK_OVERFLOW at %s:%i\n", filename, linenumber);
  41                 break;
  42 #endif
  43 #ifdef GL_STACK_UNDERFLOW
  44         case GL_STACK_UNDERFLOW:
  45                 Con_Printf("GL_STACK_UNDERFLOW at %s:%i\n", filename, linenumber);
  46                 break;
  47 #endif
  48 #ifdef GL_OUT_OF_MEMORY
  49         case GL_OUT_OF_MEMORY:
  50                 Con_Printf("GL_OUT_OF_MEMORY at %s:%i\n", filename, linenumber);
  51                 break;
  52 #endif
  53 #ifdef GL_TABLE_TOO_LARGE
  54     case GL_TABLE_TOO_LARGE:
  55                 Con_Printf("GL_TABLE_TOO_LARGE at %s:%i\n", filename, linenumber);
  56                 break;
  57 #endif
  58         default:
  59                 Con_Printf("GL UNKNOWN (%i) at %s:%i\n", errornumber, filename, linenumber);
  60                 break;
  61         }
  62 }
  63 #endif
  64
  65 #define BACKENDACTIVECHECK if (!backendactive) Sys_Error("GL backend function called when backend is not active\n");
  66
  67 int c_meshs, c_meshelements;
  68
  69 void SCR_ScreenShot_f (void);
  70
  71 // these are externally accessible
  72 int r_lightmapscalebit;
  73 float r_colorscale;
  74 float *varray_vertex;
  75 float *varray_color;
  76 float *varray_texcoord[MAX_TEXTUREUNITS];
  77 int mesh_maxverts;
  78
  79 static matrix4x4_t backend_viewmatrix;
  80 static matrix4x4_t backend_modelmatrix;
  81 static matrix4x4_t backend_modelviewmatrix;
  82 static matrix4x4_t backend_glmodelviewmatrix;
  83
  84 static int backendunits, backendactive;
  85 static qbyte *varray_bcolor;
  86 static mempool_t *gl_backend_mempool;
  87
  88 /*
  89 note: here's strip order for a terrain row:
  90 0--1--2--3--4
  91 |\ |\ |\ |\ |
  92 | \| \| \| \|
  93 A--B--C--D--E
  94
  95 A0B, 01B, B1C, 12C, C2D, 23D, D3E, 34E
  96
  97 *elements++ = i + row;
  98 *elements++ = i;
  99 *elements++ = i + row + 1;
 100 *elements++ = i;
 101 *elements++ = i + 1;
 102 *elements++ = i + row + 1;
 103 */
 104
 105 int polygonelements[768];
 106
 107 void GL_Backend_AllocArrays(void)
 108 {
 109         int i;
 110
 111         for (i = 0;i < POLYGONELEMENTS_MAXPOINTS - 2;i++)
 112         {
 113                 polygonelements[i * 3 + 0] = 0;
 114                 polygonelements[i * 3 + 1] = i + 1;
 115                 polygonelements[i * 3 + 2] = i + 2;
 116         }
 117
 118         if (!gl_backend_mempool)
 119                 gl_backend_mempool = Mem_AllocPool("GL_Backend");
 120
 121         varray_vertex = Mem_Alloc(gl_backend_mempool, mesh_maxverts * sizeof(float[4]));
 122         varray_color = Mem_Alloc(gl_backend_mempool, mesh_maxverts * sizeof(float[4]));
 123         varray_bcolor = Mem_Alloc(gl_backend_mempool, mesh_maxverts * sizeof(qbyte[4]));
 124         for (i = 0;i < backendunits;i++)
 125                 varray_texcoord[i] = Mem_Alloc(gl_backend_mempool, mesh_maxverts * sizeof(float[4]));
 126         for (;i < MAX_TEXTUREUNITS;i++)
 127                 varray_texcoord[i] = NULL;
 128 }
 129
 130 void GL_Backend_FreeArrays(int resizingbuffers)
 131 {
 132         int i;
 133         if (resizingbuffers)
 134                 Mem_EmptyPool(gl_backend_mempool);
 135         else
 136                 Mem_FreePool(&gl_backend_mempool);
 137         varray_vertex = NULL;
 138         varray_color = NULL;
 139         varray_bcolor = NULL;
 140         for (i = 0;i < MAX_TEXTUREUNITS;i++)
 141                 varray_texcoord[i] = NULL;
 142 }
 143
 144 static void gl_backend_start(void)
 145 {
 146         Con_Printf("OpenGL Backend started with gl_mesh_maxverts %i\n", gl_mesh_maxverts.integer);
 147         if (qglDrawRangeElements != NULL)
 148         {
 149                 qglGetIntegerv(GL_MAX_ELEMENTS_VERTICES, &gl_maxdrawrangeelementsvertices);
 150                 qglGetIntegerv(GL_MAX_ELEMENTS_INDICES, &gl_maxdrawrangeelementsindices);
 151                 CHECKGLERROR
 152                 Con_Printf("glDrawRangeElements detected (max vertices %i, max indices %i)\n", gl_maxdrawrangeelementsvertices, gl_maxdrawrangeelementsindices);
 153         }
 154         if (strstr(gl_renderer, "3Dfx"))
 155         {
 156                 Con_Printf("3Dfx driver detected, forcing gl_mesh_floatcolors to 0 to prevent crashs\n");
 157                 Cvar_SetValueQuick(&gl_mesh_floatcolors, 0);
 158         }
 159
 160         backendunits = min(MAX_TEXTUREUNITS, gl_textureunits);
 161
 162         GL_Backend_AllocArrays();
 163
 164         backendactive = true;
 165 }
 166
 167 static void gl_backend_shutdown(void)
 168 {
 169         backendunits = 0;
 170         backendactive = false;
 171
 172         Con_Printf("OpenGL Backend shutting down\n");
 173
 174         GL_Backend_FreeArrays(false);
 175 }
 176
 177 void GL_Backend_CheckCvars(void)
 178 {
 179         // 21760 is (65536 / 3) rounded off to a multiple of 128
 180         if (gl_mesh_maxverts.integer < 1024)
 181                 Cvar_SetValueQuick(&gl_mesh_maxverts, 1024);
 182         if (gl_mesh_maxverts.integer > 21760)
 183                 Cvar_SetValueQuick(&gl_mesh_maxverts, 21760);
 184 }
 185
 186 void GL_Backend_ResizeArrays(int numtriangles)
 187 {
 188         Cvar_SetValueQuick(&gl_mesh_maxverts, numtriangles);
 189         GL_Backend_CheckCvars();
 190         mesh_maxverts = gl_mesh_maxverts.integer;
 191         GL_Backend_FreeArrays(true);
 192         GL_Backend_AllocArrays();
 193 }
 194
 195 static void gl_backend_newmap(void)
 196 {
 197 }
 198
 199 void gl_backend_init(void)
 200 {
 201         Cvar_RegisterVariable(&r_render);
 202         Cvar_RegisterVariable(&gl_dither);
 203         Cvar_RegisterVariable(&gl_lockarrays);
 204 #ifdef NORENDER
 205         Cvar_SetValue("r_render", 0);
 206 #endif
 207
 208         Cvar_RegisterVariable(&gl_mesh_maxverts);
 209         Cvar_RegisterVariable(&gl_mesh_floatcolors);
 210         Cvar_RegisterVariable(&gl_mesh_drawrangeelements);
 211         GL_Backend_CheckCvars();
 212         R_RegisterModule("GL_Backend", gl_backend_start, gl_backend_shutdown, gl_backend_newmap);
 213 }
 214
 215 void GL_SetupView_ViewPort (int x, int y, int width, int height)
 216 {
 217         if (!r_render.integer)
 218                 return;
 219
 220         // y is weird beause OpenGL is bottom to top, we use top to bottom
 221         qglViewport(x, vid.realheight - (y + height), width, height);
 222         CHECKGLERROR
 223 }
 224
 225 void GL_SetupView_Orientation_Identity (void)
 226 {
 227         Matrix4x4_CreateIdentity(&backend_viewmatrix);
 228         memset(&backend_modelmatrix, 0, sizeof(backend_modelmatrix));
 229 }
 230
 231 void GL_SetupView_Orientation_FromEntity (vec3_t origin, vec3_t angles)
 232 {
 233         Matrix4x4_CreateRotate(&backend_viewmatrix, -90, 1, 0, 0);
 234         Matrix4x4_ConcatRotate(&backend_viewmatrix, 90, 0, 0, 1);
 235         Matrix4x4_ConcatRotate(&backend_viewmatrix, -angles[2], 1, 0, 0);
 236         Matrix4x4_ConcatRotate(&backend_viewmatrix, -angles[0], 0, 1, 0);
 237         Matrix4x4_ConcatRotate(&backend_viewmatrix, -angles[1], 0, 0, 1);
 238         Matrix4x4_ConcatTranslate(&backend_viewmatrix, -origin[0], -origin[1], -origin[2]);
 239         memset(&backend_modelmatrix, 0, sizeof(backend_modelmatrix));
 240 }
 241
 242 void GL_SetupView_Mode_Perspective (double fovx, double fovy, double zNear, double zFar)
 243 {
 244         double xmax, ymax;
 245
 246         if (!r_render.integer)
 247                 return;
 248
 249         // set up viewpoint
 250         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 251         qglLoadIdentity ();CHECKGLERROR
 252         // pyramid slopes
 253         xmax = zNear * tan(fovx * M_PI / 360.0);
 254         ymax = zNear * tan(fovy * M_PI / 360.0);
 255         // set view pyramid
 256         qglFrustum(-xmax, xmax, -ymax, ymax, zNear, zFar);CHECKGLERROR
 257         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 258         GL_SetupView_Orientation_Identity();
 259 }
 260
 261 void GL_SetupView_Mode_PerspectiveInfiniteFarClip (double fovx, double fovy, double zNear)
 262 {
 263         double nudge, m[16];
 264
 265         if (!r_render.integer)
 266                 return;
 267
 268         // set up viewpoint
 269         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 270         qglLoadIdentity ();CHECKGLERROR
 271         // set view pyramid
 272         nudge = 1.0 - 1.0 / (1<<23);
 273         m[ 0] = 1.0 / tan(fovx * M_PI / 360.0);
 274         m[ 1] = 0;
 275         m[ 2] = 0;
 276         m[ 3] = 0;
 277         m[ 4] = 0;
 278         m[ 5] = 1.0 / tan(fovy * M_PI / 360.0);
 279         m[ 6] = 0;
 280         m[ 7] = 0;
 281         m[ 8] = 0;
 282         m[ 9] = 0;
 283         m[10] = -1 * nudge;
 284         m[11] = -1 * nudge;
 285         m[12] = 0;
 286         m[13] = 0;
 287         m[14] = -2 * zNear * nudge;
 288         m[15] = 0;
 289         qglLoadMatrixd(m);
 290         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 291         GL_SetupView_Orientation_Identity();
 292 }
 293
 294 void GL_SetupView_Mode_Ortho (double x1, double y1, double x2, double y2, double zNear, double zFar)
 295 {
 296         if (!r_render.integer)
 297                 return;
 298
 299         // set up viewpoint
 300         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 301         qglLoadIdentity ();CHECKGLERROR
 302         qglOrtho(x1, x2, y2, y1, zNear, zFar);
 303         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 304         GL_SetupView_Orientation_Identity();
 305 }
 306
 307 typedef struct gltextureunit_s
 308 {
 309         unsigned int t1d, t2d, t3d, tcubemap;
 310         unsigned int arrayenabled;
 311         float rgbscale, alphascale;
 312         int combinergb, combinealpha;
 313         // FIXME: add more combine stuff
 314 }
 315 gltextureunit_t;
 316
 317 static struct
 318 {
 319         int blendfunc1;
 320         int blendfunc2;
 321         int blend;
 322         GLboolean depthmask;
 323         int depthdisable;
 324         int unit;
 325         int clientunit;
 326         gltextureunit_t units[MAX_TEXTUREUNITS];
 327         int colorarray;
 328 }
 329 gl_state;
 330
 331 void GL_SetupTextureState(void)
 332 {
 333         int i;
 334         gltextureunit_t *unit;
 335         for (i = 0;i < backendunits;i++)
 336         {
 337                 if (qglActiveTexture)
 338                         qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 339                 if (qglClientActiveTexture)
 340                         qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 341                 unit = gl_state.units + i;
 342                 unit->t1d = 0;
 343                 unit->t2d = 0;
 344                 unit->t3d = 0;
 345                 unit->tcubemap = 0;
 346                 unit->rgbscale = 1;
 347                 unit->alphascale = 1;
 348                 unit->combinergb = GL_MODULATE;
 349                 unit->combinealpha = GL_MODULATE;
 350                 unit->arrayenabled = false;
 351                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 352                 if (gl_texture3d)
 353                 {
 354                         qglTexCoordPointer(3, GL_FLOAT, sizeof(float[4]), varray_texcoord[i]);CHECKGLERROR
 355                 }
 356                 else
 357                 {
 358                         qglTexCoordPointer(2, GL_FLOAT, sizeof(float[4]), varray_texcoord[i]);CHECKGLERROR
 359                 }
 360                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 361                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 362                 if (gl_texture3d)
 363                 {
 364                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 365                 }
 366                 if (gl_texturecubemap)
 367                 {
 368                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 369                 }
 370                 if (gl_combine.integer)
 371                 {
 372                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);CHECKGLERROR
 373                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_MODULATE);CHECKGLERROR
 374                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE);CHECKGLERROR
 375                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 376                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_RGB_ARB, GL_CONSTANT_ARB);CHECKGLERROR
 377                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 378                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 379                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_RGB_ARB, GL_SRC_ALPHA);CHECKGLERROR
 380                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, GL_MODULATE);CHECKGLERROR
 381                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA_ARB, GL_TEXTURE);CHECKGLERROR
 382                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_ALPHA_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 383                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_ALPHA_ARB, GL_CONSTANT_ARB);CHECKGLERROR
 384                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 385                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 386                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 387                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
 388                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
 389                 }
 390                 else
 391                 {
 392                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 393                 }
 394         }
 395 }
 396
 397 void GL_Backend_ResetState(void)
 398 {
 399         memset(&gl_state, 0, sizeof(gl_state));
 400         gl_state.depthdisable = false;
 401         gl_state.blendfunc1 = GL_ONE;
 402         gl_state.blendfunc2 = GL_ZERO;
 403         gl_state.blend = false;
 404         gl_state.depthmask = GL_TRUE;
 405         gl_state.colorarray = false;
 406
 407         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 408         qglDisableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 409
 410         qglEnable(GL_CULL_FACE);CHECKGLERROR
 411         qglCullFace(GL_FRONT);CHECKGLERROR
 412         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 413         qglBlendFunc(gl_state.blendfunc1, gl_state.blendfunc2);CHECKGLERROR
 414         qglDisable(GL_BLEND);CHECKGLERROR
 415         qglDepthMask(gl_state.depthmask);CHECKGLERROR
 416         qglVertexPointer(3, GL_FLOAT, sizeof(float[4]), varray_vertex);CHECKGLERROR
 417         qglEnableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 418         if (gl_mesh_floatcolors.integer)
 419         {
 420                 qglColorPointer(4, GL_FLOAT, sizeof(float[4]), varray_color);CHECKGLERROR
 421         }
 422         else
 423         {
 424                 qglColorPointer(4, GL_UNSIGNED_BYTE, sizeof(qbyte[4]), varray_bcolor);CHECKGLERROR
 425         }
 426         GL_Color(1, 1, 1, 1);
 427
 428         GL_SetupTextureState();
 429 }
 430
 431 void GL_UseColorArray(void)
 432 {
 433         if (!gl_state.colorarray)
 434         {
 435                 gl_state.colorarray = true;
 436                 qglEnableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 437         }
 438 }
 439
 440 void GL_Color(float cr, float cg, float cb, float ca)
 441 {
 442         if (gl_state.colorarray)
 443         {
 444                 gl_state.colorarray = false;
 445                 qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 446         }
 447         qglColor4f(cr, cg, cb, ca);
 448 }
 449
 450 // called at beginning of frame
 451 void R_Mesh_Start(void)
 452 {
 453         BACKENDACTIVECHECK
 454
 455         CHECKGLERROR
 456
 457         GL_Backend_CheckCvars();
 458         if (mesh_maxverts != gl_mesh_maxverts.integer)
 459                 GL_Backend_ResizeArrays(gl_mesh_maxverts.integer);
 460
 461         GL_Backend_ResetState();
 462 }
 463
 464 int gl_backend_rebindtextures;
 465
 466 void GL_ConvertColorsFloatToByte(int numverts)
 467 {
 468         int i, k, total;
 469         // LordHavoc: to avoid problems with aliasing (treating memory as two
 470         // different types - exactly what this is doing), these must be volatile
 471         // (or a union)
 472         volatile int *icolor;
 473         volatile float *fcolor;
 474         qbyte *bcolor;
 475
 476         total = numverts * 4;
 477
 478         // shift float to have 8bit fraction at base of number
 479         fcolor = varray_color;
 480         for (i = 0;i < total;)
 481         {
 482                 fcolor[i    ] += 32768.0f;
 483                 fcolor[i + 1] += 32768.0f;
 484                 fcolor[i + 2] += 32768.0f;
 485                 fcolor[i + 3] += 32768.0f;
 486                 i += 4;
 487         }
 488
 489         // then read as integer and kill float bits...
 490         icolor = (int *)varray_color;
 491         bcolor = varray_bcolor;
 492         for (i = 0;i < total;)
 493         {
 494                 k = icolor[i    ] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i    ] = (qbyte) k;
 495                 k = icolor[i + 1] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i + 1] = (qbyte) k;
 496                 k = icolor[i + 2] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i + 2] = (qbyte) k;
 497                 k = icolor[i + 3] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i + 3] = (qbyte) k;
 498                 i += 4;
 499         }
 500 }
 501
 502 void GL_DrawRangeElements(int firstvert, int endvert, int indexcount, const int *index)
 503 {
 504         int arraylocked = false;
 505         c_meshs++;
 506         c_meshelements += indexcount;
 507         if (indexcount == 0 || endvert == firstvert)
 508         {
 509                 Con_Printf("GL_DrawRangeElements(%d, %d, %d, %08p);\n", firstvert, endvert, indexcount, index);
 510                 return;
 511         }
 512         if (gl_supportslockarrays && gl_lockarrays.integer)
 513         {
 514                 qglLockArraysEXT(firstvert, endvert - firstvert);
 515                 CHECKGLERROR
 516                 arraylocked = true;
 517         }
 518         if (gl_mesh_drawrangeelements.integer && qglDrawRangeElements != NULL)
 519                 qglDrawRangeElements(GL_TRIANGLES, firstvert, endvert, indexcount, GL_UNSIGNED_INT, (const GLuint *) index);
 520         else
 521                 qglDrawElements(GL_TRIANGLES, indexcount, GL_UNSIGNED_INT, (const GLuint *) index);
 522         CHECKGLERROR
 523         if (arraylocked)
 524         {
 525                 qglUnlockArraysEXT();
 526                 CHECKGLERROR
 527                 arraylocked = false;
 528         }
 529 }
 530
 531 // enlarges geometry buffers if they are too small
 532 void _R_Mesh_ResizeCheck(int numverts)
 533 {
 534         if (numverts > mesh_maxverts)
 535         {
 536                 BACKENDACTIVECHECK
 537                 GL_Backend_ResizeArrays(numverts + 100);
 538                 GL_Backend_ResetState();
 539         }
 540 }
 541
 542 // renders the mesh
 543 void R_Mesh_Draw(int numverts, int numtriangles, const int *elements)
 544 {
 545         BACKENDACTIVECHECK
 546
 547         CHECKGLERROR
 548
 549         if (gl_state.colorarray && !gl_mesh_floatcolors.integer)
 550                 GL_ConvertColorsFloatToByte(numverts);
 551         if (!r_render.integer)
 552                 return;
 553         GL_DrawRangeElements(0, numverts, numtriangles * 3, elements);
 554 }
 555
 556 // restores backend state, used when done with 3D rendering
 557 void R_Mesh_Finish(void)
 558 {
 559         int i;
 560         BACKENDACTIVECHECK
 561
 562         for (i = backendunits - 1;i >= 0;i--)
 563         {
 564                 if (qglActiveTexture)
 565                         qglActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
 566                 if (qglClientActiveTexture)
 567                         qglClientActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
 568                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 569                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 570                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 571                 if (gl_texture3d)
 572                 {
 573                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 574                 }
 575                 if (gl_texturecubemap)
 576                 {
 577                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 578                 }
 579                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 580                 if (gl_combine.integer)
 581                 {
 582                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
 583                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
 584                 }
 585         }
 586         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 587         qglDisableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 588
 589         qglDisable(GL_BLEND);CHECKGLERROR
 590         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 591         qglDepthMask(GL_TRUE);CHECKGLERROR
 592         qglBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);CHECKGLERROR
 593 }
 594
 595 void R_Mesh_Matrix(const matrix4x4_t *matrix)
 596 {
 597         if (memcmp(matrix, &backend_modelmatrix, sizeof(matrix4x4_t)))
 598         {
 599                 backend_modelmatrix = *matrix;
 600                 Matrix4x4_Concat(&backend_modelviewmatrix, &backend_viewmatrix, matrix);
 601                 Matrix4x4_Transpose(&backend_glmodelviewmatrix, &backend_modelviewmatrix);
 602                 qglLoadMatrixf(&backend_glmodelviewmatrix.m[0][0]);
 603         }
 604 }
 605
 606 // sets up the requested state
 607 void R_Mesh_MainState(const rmeshstate_t *m)
 608 {
 609         BACKENDACTIVECHECK
 610
 611         if (gl_state.blendfunc1 != m->blendfunc1 || gl_state.blendfunc2 != m->blendfunc2)
 612         {
 613                 qglBlendFunc(gl_state.blendfunc1 = m->blendfunc1, gl_state.blendfunc2 = m->blendfunc2);CHECKGLERROR
 614                 if (gl_state.blendfunc2 == GL_ZERO)
 615                 {
 616                         if (gl_state.blendfunc1 == GL_ONE)
 617                         {
 618                                 if (gl_state.blend)
 619                                 {
 620                                         gl_state.blend = 0;
 621                                         qglDisable(GL_BLEND);CHECKGLERROR
 622                                 }
 623                         }
 624                         else
 625                         {
 626                                 if (!gl_state.blend)
 627                                 {
 628                                         gl_state.blend = 1;
 629                                         qglEnable(GL_BLEND);CHECKGLERROR
 630                                 }
 631                         }
 632                 }
 633                 else
 634                 {
 635                         if (!gl_state.blend)
 636                         {
 637                                 gl_state.blend = 1;
 638                                 qglEnable(GL_BLEND);CHECKGLERROR
 639                         }
 640                 }
 641         }
 642         if (gl_state.depthdisable != m->depthdisable)
 643         {
 644                 gl_state.depthdisable = m->depthdisable;
 645                 if (gl_state.depthdisable)
 646                         qglDisable(GL_DEPTH_TEST);
 647                 else
 648                         qglEnable(GL_DEPTH_TEST);
 649         }
 650         if (gl_state.depthmask != (m->blendfunc2 == GL_ZERO || m->depthwrite))
 651         {
 652                 qglDepthMask(gl_state.depthmask = (m->blendfunc2 == GL_ZERO || m->depthwrite));CHECKGLERROR
 653         }
 654 }
 655
 656 void R_Mesh_TextureState(const rmeshstate_t *m)
 657 {
 658         int i, combinergb, combinealpha;
 659         float scale;
 660         gltextureunit_t *unit;
 661
 662         BACKENDACTIVECHECK
 663
 664         if (gl_backend_rebindtextures)
 665         {
 666                 gl_backend_rebindtextures = false;
 667                 GL_SetupTextureState();
 668         }
 669
 670         for (i = 0;i < backendunits;i++)
 671         {
 672                 unit = gl_state.units + i;
 673                 if (unit->t1d != m->tex1d[i] || unit->t2d != m->tex[i] || unit->t3d != m->tex3d[i] || unit->tcubemap != m->texcubemap[i])
 674                 {
 675                         if (gl_state.unit != i)
 676                         {
 677                                 qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 678                         }
 679                         if (m->tex1d[i] || m->tex[i] || m->tex3d[i] || m->texcubemap[i])
 680                         {
 681                                 if (!unit->arrayenabled)
 682                                 {
 683                                         unit->arrayenabled = true;
 684                                         if (gl_state.clientunit != i)
 685                                         {
 686                                                 qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 687                                         }
 688                                         qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 689                                 }
 690                         }
 691                         else
 692                         {
 693                                 if (unit->arrayenabled)
 694                                 {
 695                                         unit->arrayenabled = false;
 696                                         if (gl_state.clientunit != i)
 697                                         {
 698                                                 qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 699                                         }
 700                                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 701                                 }
 702                         }
 703                         combinergb = m->texcombinergb[i];
 704                         combinealpha = m->texcombinealpha[i];
 705                         if (!combinergb)
 706                                 combinergb = GL_MODULATE;
 707                         if (!combinealpha)
 708                                 combinealpha = GL_MODULATE;
 709                         if (unit->combinergb != combinergb)
 710                         {
 711                                 unit->combinergb = combinergb;
 712                                 if (gl_combine.integer)
 713                                 {
 714                                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, unit->combinergb);CHECKGLERROR
 715                                 }
 716                                 else
 717                                 {
 718                                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, unit->combinergb);CHECKGLERROR
 719                                 }
 720                         }
 721                         if (unit->combinealpha != combinealpha)
 722                         {
 723                                 unit->combinealpha = combinealpha;
 724                                 if (gl_combine.integer)
 725                                 {
 726                                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, unit->combinealpha);CHECKGLERROR
 727                                 }
 728                         }
 729                         if (unit->t1d != m->tex1d[i])
 730                         {
 731                                 if (m->tex1d[i])
 732                                 {
 733                                         if (unit->t1d == 0)
 734                                                 qglEnable(GL_TEXTURE_1D);CHECKGLERROR
 735                                 }
 736                                 else
 737                                 {
 738                                         if (unit->t1d)
 739                                                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 740                                 }
 741                                 qglBindTexture(GL_TEXTURE_1D, (unit->t1d = m->tex1d[i]));CHECKGLERROR
 742                         }
 743                         if (unit->t2d != m->tex[i])
 744                         {
 745                                 if (m->tex[i])
 746                                 {
 747                                         if (unit->t2d == 0)
 748                                                 qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 749                                 }
 750                                 else
 751                                 {
 752                                         if (unit->t2d)
 753                                                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 754                                 }
 755                                 qglBindTexture(GL_TEXTURE_2D, (unit->t2d = m->tex[i]));CHECKGLERROR
 756                         }
 757                         if (unit->t3d != m->tex3d[i])
 758                         {
 759                                 if (m->tex3d[i])
 760                                 {
 761                                         if (unit->t3d == 0)
 762                                                 qglEnable(GL_TEXTURE_3D);CHECKGLERROR
 763                                 }
 764                                 else
 765                                 {
 766                                         if (unit->t3d)
 767                                                 qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 768                                 }
 769                                 qglBindTexture(GL_TEXTURE_3D, (unit->t3d = m->tex3d[i]));CHECKGLERROR
 770                         }
 771                         if (unit->tcubemap != m->texcubemap[i])
 772                         {
 773                                 if (m->texcubemap[i])
 774                                 {
 775                                         if (unit->tcubemap == 0)
 776                                                 qglEnable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 777                                 }
 778                                 else
 779                                 {
 780                                         if (unit->tcubemap)
 781                                                 qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 782                                 }
 783                                 qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, (unit->tcubemap = m->texcubemap[i]));CHECKGLERROR
 784                         }
 785                 }
 786                 scale = max(m->texrgbscale[i], 1);
 787                 if (gl_state.units[i].rgbscale != scale)
 788                 {
 789                         if (gl_state.unit != i)
 790                         {
 791                                 qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 792                         }
 793                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, (gl_state.units[i].rgbscale = scale));CHECKGLERROR
 794                 }
 795                 scale = max(m->texalphascale[i], 1);
 796                 if (gl_state.units[i].alphascale != scale)
 797                 {
 798                         if (gl_state.unit != i)
 799                         {
 800                                 qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 801                         }
 802                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, (gl_state.units[i].alphascale = scale));CHECKGLERROR
 803                 }
 804         }
 805 }
 806
 807 void R_Mesh_State(const rmeshstate_t *m)
 808 {
 809         R_Mesh_MainState(m);
 810         R_Mesh_TextureState(m);
 811 }
 812
 813 /*
 814 ==============================================================================
 815
 816                                                 SCREEN SHOTS
 817
 818 ==============================================================================
 819 */
 820
 821 qboolean SCR_ScreenShot(char *filename, int x, int y, int width, int height)
 822 {
 823         qboolean ret;
 824         int i;
 825         qbyte *buffer;
 826
 827         if (!r_render.integer)
 828                 return false;
 829
 830         buffer = Mem_Alloc(tempmempool, width*height*3);
 831         qglReadPixels (x, y, width, height, GL_RGB, GL_UNSIGNED_BYTE, buffer);
 832         CHECKGLERROR
 833
 834         // LordHavoc: compensate for v_overbrightbits when using hardware gamma
 835         if (v_hwgamma.integer)
 836                 for (i = 0;i < width * height * 3;i++)
 837                         buffer[i] <<= v_overbrightbits.integer;
 838
 839         ret = Image_WriteTGARGB_preflipped(filename, width, height, buffer);
 840
 841         Mem_Free(buffer);
 842         return ret;
 843 }
 844
 845 //=============================================================================
 846
 847 void R_ClearScreen(void)
 848 {
 849         if (r_render.integer)
 850         {
 851                 // clear to black
 852                 qglClearColor(0,0,0,0);CHECKGLERROR
 853                 qglClearDepth(1);CHECKGLERROR
 854                 if (gl_stencil)
 855                 {
 856                         qglClearStencil(0);CHECKGLERROR
 857                 }
 858                 // clear the screen
 859                 qglClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | (gl_stencil ? GL_STENCIL_BUFFER_BIT : 0));CHECKGLERROR
 860                 // set dithering mode
 861                 if (gl_dither.integer)
 862                 {
 863                         qglEnable(GL_DITHER);CHECKGLERROR
 864                 }
 865                 else
 866                 {
 867                         qglDisable(GL_DITHER);CHECKGLERROR
 868                 }
 869         }
 870 }
 871
 872 /*
 873 ==================
 874 SCR_UpdateScreen
 875
 876 This is called every frame, and can also be called explicitly to flush
 877 text to the screen.
 878 ==================
 879 */
 880 void SCR_UpdateScreen (void)
 881 {
 882         VID_Finish ();
 883
 884         R_TimeReport("finish");
 885
 886         if (r_textureunits.integer > gl_textureunits)
 887                 Cvar_SetValueQuick(&r_textureunits, gl_textureunits);
 888         if (r_textureunits.integer < 1)
 889                 Cvar_SetValueQuick(&r_textureunits, 1);
 890
 891         if (gl_combine.integer && (!gl_combine_extension || r_textureunits.integer < 2))
 892                 Cvar_SetValueQuick(&gl_combine, 0);
 893
 894         // lighting scale
 895         r_colorscale = 1.0f / (float) (1 << v_overbrightbits.integer);
 896
 897         // lightmaps only
 898         r_lightmapscalebit = v_overbrightbits.integer;
 899         if (gl_combine.integer && r_textureunits.integer > 1)
 900                 r_lightmapscalebit += 2;
 901
 902         R_TimeReport("setup");
 903
 904         R_ClearScreen();
 905
 906         R_TimeReport("clear");
 907
 908         if (scr_conlines < vid.conheight && cls.signon == SIGNONS)
 909                 R_RenderView();
 910
 911         // draw 2D stuff
 912         R_DrawQueue();
 913
 914         // tell driver to commit it's partially full geometry queue to the rendering queue
 915         // (this doesn't wait for the commands themselves to complete)
 916         qglFlush();
 917 }
 918