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 static matrix4x4_t backend_projectmatrix;
  84
  85 static int backendunits, backendactive;
  86 static qbyte *varray_bcolor;
  87 static mempool_t *gl_backend_mempool;
  88
  89 /*
  90 note: here's strip order for a terrain row:
  91 0--1--2--3--4
  92 |\ |\ |\ |\ |
  93 | \| \| \| \|
  94 A--B--C--D--E
  95
  96 A0B, 01B, B1C, 12C, C2D, 23D, D3E, 34E
  97
  98 *elements++ = i + row;
  99 *elements++ = i;
 100 *elements++ = i + row + 1;
 101 *elements++ = i;
 102 *elements++ = i + 1;
 103 *elements++ = i + row + 1;
 104 */
 105
 106 int polygonelements[768];
 107
 108 void GL_Backend_AllocArrays(void)
 109 {
 110         int i;
 111
 112         for (i = 0;i < POLYGONELEMENTS_MAXPOINTS - 2;i++)
 113         {
 114                 polygonelements[i * 3 + 0] = 0;
 115                 polygonelements[i * 3 + 1] = i + 1;
 116                 polygonelements[i * 3 + 2] = i + 2;
 117         }
 118
 119         if (!gl_backend_mempool)
 120                 gl_backend_mempool = Mem_AllocPool("GL_Backend");
 121
 122         varray_vertex = Mem_Alloc(gl_backend_mempool, mesh_maxverts * sizeof(float[4]));
 123         varray_color = Mem_Alloc(gl_backend_mempool, mesh_maxverts * sizeof(float[4]));
 124         varray_bcolor = Mem_Alloc(gl_backend_mempool, mesh_maxverts * sizeof(qbyte[4]));
 125         for (i = 0;i < backendunits;i++)
 126                 varray_texcoord[i] = Mem_Alloc(gl_backend_mempool, mesh_maxverts * sizeof(float[4]));
 127         for (;i < MAX_TEXTUREUNITS;i++)
 128                 varray_texcoord[i] = NULL;
 129 }
 130
 131 void GL_Backend_FreeArrays(int resizingbuffers)
 132 {
 133         int i;
 134         if (resizingbuffers)
 135                 Mem_EmptyPool(gl_backend_mempool);
 136         else
 137                 Mem_FreePool(&gl_backend_mempool);
 138         varray_vertex = NULL;
 139         varray_color = NULL;
 140         varray_bcolor = NULL;
 141         for (i = 0;i < MAX_TEXTUREUNITS;i++)
 142                 varray_texcoord[i] = NULL;
 143 }
 144
 145 static void gl_backend_start(void)
 146 {
 147         Con_Printf("OpenGL Backend started with gl_mesh_maxverts %i\n", gl_mesh_maxverts.integer);
 148         if (qglDrawRangeElements != NULL)
 149         {
 150                 qglGetIntegerv(GL_MAX_ELEMENTS_VERTICES, &gl_maxdrawrangeelementsvertices);
 151                 qglGetIntegerv(GL_MAX_ELEMENTS_INDICES, &gl_maxdrawrangeelementsindices);
 152                 CHECKGLERROR
 153                 Con_Printf("glDrawRangeElements detected (max vertices %i, max indices %i)\n", gl_maxdrawrangeelementsvertices, gl_maxdrawrangeelementsindices);
 154         }
 155         if (strstr(gl_renderer, "3Dfx"))
 156         {
 157                 Con_Printf("3Dfx driver detected, forcing gl_mesh_floatcolors to 0 to prevent crashs\n");
 158                 Cvar_SetValueQuick(&gl_mesh_floatcolors, 0);
 159         }
 160
 161         backendunits = min(MAX_TEXTUREUNITS, gl_textureunits);
 162
 163         GL_Backend_AllocArrays();
 164
 165         backendactive = true;
 166 }
 167
 168 static void gl_backend_shutdown(void)
 169 {
 170         backendunits = 0;
 171         backendactive = false;
 172
 173         Con_Printf("OpenGL Backend shutting down\n");
 174
 175         GL_Backend_FreeArrays(false);
 176 }
 177
 178 void GL_Backend_CheckCvars(void)
 179 {
 180         // 21760 is (65536 / 3) rounded off to a multiple of 128
 181         if (gl_mesh_maxverts.integer < 1024)
 182                 Cvar_SetValueQuick(&gl_mesh_maxverts, 1024);
 183         if (gl_mesh_maxverts.integer > 21760)
 184                 Cvar_SetValueQuick(&gl_mesh_maxverts, 21760);
 185 }
 186
 187 void GL_Backend_ResizeArrays(int numtriangles)
 188 {
 189         Cvar_SetValueQuick(&gl_mesh_maxverts, numtriangles);
 190         GL_Backend_CheckCvars();
 191         mesh_maxverts = gl_mesh_maxverts.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_maxverts);
 210         Cvar_RegisterVariable(&gl_mesh_floatcolors);
 211         Cvar_RegisterVariable(&gl_mesh_drawrangeelements);
 212         GL_Backend_CheckCvars();
 213         R_RegisterModule("GL_Backend", gl_backend_start, gl_backend_shutdown, gl_backend_newmap);
 214 }
 215
 216 void GL_SetupView_ViewPort (int x, int y, int width, int height)
 217 {
 218         if (!r_render.integer)
 219                 return;
 220
 221         // y is weird beause OpenGL is bottom to top, we use top to bottom
 222         qglViewport(x, vid.realheight - (y + height), width, height);
 223         CHECKGLERROR
 224 }
 225
 226 void GL_SetupView_Orientation_Identity (void)
 227 {
 228         Matrix4x4_CreateIdentity(&backend_viewmatrix);
 229         memset(&backend_modelmatrix, 0, sizeof(backend_modelmatrix));
 230 }
 231
 232 void GL_SetupView_Orientation_FromEntity (vec3_t origin, vec3_t angles)
 233 {
 234         Matrix4x4_CreateRotate(&backend_viewmatrix, -90, 1, 0, 0);
 235         Matrix4x4_ConcatRotate(&backend_viewmatrix, 90, 0, 0, 1);
 236         Matrix4x4_ConcatRotate(&backend_viewmatrix, -angles[2], 1, 0, 0);
 237         Matrix4x4_ConcatRotate(&backend_viewmatrix, -angles[0], 0, 1, 0);
 238         Matrix4x4_ConcatRotate(&backend_viewmatrix, -angles[1], 0, 0, 1);
 239         Matrix4x4_ConcatTranslate(&backend_viewmatrix, -origin[0], -origin[1], -origin[2]);
 240         memset(&backend_modelmatrix, 0, sizeof(backend_modelmatrix));
 241 }
 242
 243 void GL_SetupView_Mode_Perspective (double fovx, double fovy, double zNear, double zFar)
 244 {
 245         double xmax, ymax;
 246
 247         if (!r_render.integer)
 248                 return;
 249
 250         // set up viewpoint
 251         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 252         qglLoadIdentity();CHECKGLERROR
 253         // pyramid slopes
 254         xmax = zNear * tan(fovx * M_PI / 360.0);
 255         ymax = zNear * tan(fovy * M_PI / 360.0);
 256         // set view pyramid
 257         qglFrustum(-xmax, xmax, -ymax, ymax, zNear, zFar);CHECKGLERROR
 258         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 259         GL_SetupView_Orientation_Identity();
 260 }
 261
 262 void GL_SetupView_Mode_PerspectiveInfiniteFarClip (double fovx, double fovy, double zNear)
 263 {
 264         float nudge, m[16];
 265
 266         if (!r_render.integer)
 267                 return;
 268
 269         // set up viewpoint
 270         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 271         qglLoadIdentity();CHECKGLERROR
 272         // set view pyramid
 273         nudge = 1.0 - 1.0 / (1<<23);
 274         m[ 0] = 1.0 / tan(fovx * M_PI / 360.0);
 275         m[ 1] = 0;
 276         m[ 2] = 0;
 277         m[ 3] = 0;
 278         m[ 4] = 0;
 279         m[ 5] = 1.0 / tan(fovy * M_PI / 360.0);
 280         m[ 6] = 0;
 281         m[ 7] = 0;
 282         m[ 8] = 0;
 283         m[ 9] = 0;
 284         m[10] = -1 * nudge;
 285         m[11] = -1 * nudge;
 286         m[12] = 0;
 287         m[13] = 0;
 288         m[14] = -2 * zNear * nudge;
 289         m[15] = 0;
 290         qglLoadMatrixf(m);
 291         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 292         GL_SetupView_Orientation_Identity();
 293         backend_projectmatrix.m[0][0] = m[0];
 294         backend_projectmatrix.m[1][0] = m[1];
 295         backend_projectmatrix.m[2][0] = m[2];
 296         backend_projectmatrix.m[3][0] = m[3];
 297         backend_projectmatrix.m[0][1] = m[4];
 298         backend_projectmatrix.m[1][1] = m[5];
 299         backend_projectmatrix.m[2][1] = m[6];
 300         backend_projectmatrix.m[3][1] = m[7];
 301         backend_projectmatrix.m[0][2] = m[8];
 302         backend_projectmatrix.m[1][2] = m[9];
 303         backend_projectmatrix.m[2][2] = m[10];
 304         backend_projectmatrix.m[3][2] = m[11];
 305         backend_projectmatrix.m[0][3] = m[12];
 306         backend_projectmatrix.m[1][3] = m[13];
 307         backend_projectmatrix.m[2][3] = m[14];
 308         backend_projectmatrix.m[3][3] = m[15];
 309 }
 310
 311 void GL_SetupView_Mode_Ortho (double x1, double y1, double x2, double y2, double zNear, double zFar)
 312 {
 313         if (!r_render.integer)
 314                 return;
 315
 316         // set up viewpoint
 317         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 318         qglLoadIdentity();CHECKGLERROR
 319         qglOrtho(x1, x2, y2, y1, zNear, zFar);
 320         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 321         GL_SetupView_Orientation_Identity();
 322 }
 323
 324 typedef struct gltextureunit_s
 325 {
 326         int t1d, t2d, t3d, tcubemap;
 327         int arrayenabled;
 328         float rgbscale, alphascale;
 329         int combinergb, combinealpha;
 330         // FIXME: add more combine stuff
 331 }
 332 gltextureunit_t;
 333
 334 static struct
 335 {
 336         int blendfunc1;
 337         int blendfunc2;
 338         int blend;
 339         GLboolean depthmask;
 340         int depthdisable;
 341         int unit;
 342         int clientunit;
 343         gltextureunit_t units[MAX_TEXTUREUNITS];
 344         int colorarray;
 345 }
 346 gl_state;
 347
 348 void GL_SetupTextureState(void)
 349 {
 350         int i;
 351         gltextureunit_t *unit;
 352         for (i = 0;i < backendunits;i++)
 353         {
 354                 if (qglActiveTexture)
 355                         qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 356                 if (qglClientActiveTexture)
 357                         qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 358                 unit = gl_state.units + i;
 359                 unit->t1d = 0;
 360                 unit->t2d = 0;
 361                 unit->t3d = 0;
 362                 unit->tcubemap = 0;
 363                 unit->rgbscale = 1;
 364                 unit->alphascale = 1;
 365                 unit->combinergb = GL_MODULATE;
 366                 unit->combinealpha = GL_MODULATE;
 367                 unit->arrayenabled = false;
 368                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 369                 if (gl_texture3d || gl_texturecubemap)
 370                 {
 371                         qglTexCoordPointer(3, GL_FLOAT, sizeof(float[4]), varray_texcoord[i]);CHECKGLERROR
 372                 }
 373                 else
 374                 {
 375                         qglTexCoordPointer(2, GL_FLOAT, sizeof(float[4]), varray_texcoord[i]);CHECKGLERROR
 376                 }
 377                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 378                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 379                 if (gl_texture3d)
 380                 {
 381                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 382                 }
 383                 if (gl_texturecubemap)
 384                 {
 385                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 386                 }
 387                 if (gl_combine.integer)
 388                 {
 389                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);CHECKGLERROR
 390                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_MODULATE);CHECKGLERROR
 391                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE);CHECKGLERROR
 392                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 393                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_RGB_ARB, GL_CONSTANT_ARB);CHECKGLERROR
 394                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 395                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 396                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_RGB_ARB, GL_SRC_ALPHA);CHECKGLERROR
 397                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, GL_MODULATE);CHECKGLERROR
 398                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA_ARB, GL_TEXTURE);CHECKGLERROR
 399                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_ALPHA_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 400                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_ALPHA_ARB, GL_CONSTANT_ARB);CHECKGLERROR
 401                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 402                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 403                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 404                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
 405                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
 406                 }
 407                 else
 408                 {
 409                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 410                 }
 411         }
 412 }
 413
 414 void GL_Backend_ResetState(void)
 415 {
 416         memset(&gl_state, 0, sizeof(gl_state));
 417         gl_state.depthdisable = false;
 418         gl_state.blendfunc1 = GL_ONE;
 419         gl_state.blendfunc2 = GL_ZERO;
 420         gl_state.blend = false;
 421         gl_state.depthmask = GL_TRUE;
 422         gl_state.colorarray = false;
 423
 424         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 425         qglDisableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 426
 427         qglEnable(GL_CULL_FACE);CHECKGLERROR
 428         qglCullFace(GL_FRONT);CHECKGLERROR
 429         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 430         qglBlendFunc(gl_state.blendfunc1, gl_state.blendfunc2);CHECKGLERROR
 431         qglDisable(GL_BLEND);CHECKGLERROR
 432         qglDepthMask(gl_state.depthmask);CHECKGLERROR
 433         qglVertexPointer(3, GL_FLOAT, sizeof(float[4]), varray_vertex);CHECKGLERROR
 434         qglEnableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 435         if (gl_mesh_floatcolors.integer)
 436         {
 437                 qglColorPointer(4, GL_FLOAT, sizeof(float[4]), varray_color);CHECKGLERROR
 438         }
 439         else
 440         {
 441                 qglColorPointer(4, GL_UNSIGNED_BYTE, sizeof(qbyte[4]), varray_bcolor);CHECKGLERROR
 442         }
 443         GL_Color(1, 1, 1, 1);
 444
 445         GL_SetupTextureState();
 446 }
 447
 448 void GL_UseColorArray(void)
 449 {
 450         if (!gl_state.colorarray)
 451         {
 452                 gl_state.colorarray = true;
 453                 qglEnableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 454         }
 455 }
 456
 457 void GL_Color(float cr, float cg, float cb, float ca)
 458 {
 459         if (gl_state.colorarray)
 460         {
 461                 gl_state.colorarray = false;
 462                 qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 463         }
 464         qglColor4f(cr, cg, cb, ca);
 465 }
 466
 467 void GL_TransformToScreen(const vec4_t in, vec4_t out)
 468 {
 469         vec4_t temp;
 470         float iw;
 471         Matrix4x4_Transform4 (&backend_viewmatrix, in, temp);
 472         Matrix4x4_Transform4 (&backend_projectmatrix, temp, out);
 473         iw = 1.0f / out[3];
 474         out[0] = r_refdef.x + (out[0] * iw + 1.0f) * r_refdef.width * 0.5f;
 475         out[1] = r_refdef.y + (out[1] * iw + 1.0f) * r_refdef.height * 0.5f;
 476         out[2] = out[2] * iw;
 477 }
 478
 479 // called at beginning of frame
 480 void R_Mesh_Start(void)
 481 {
 482         BACKENDACTIVECHECK
 483
 484         CHECKGLERROR
 485
 486         GL_Backend_CheckCvars();
 487         if (mesh_maxverts != gl_mesh_maxverts.integer)
 488                 GL_Backend_ResizeArrays(gl_mesh_maxverts.integer);
 489
 490         GL_Backend_ResetState();
 491 }
 492
 493 int gl_backend_rebindtextures;
 494
 495 void GL_ConvertColorsFloatToByte(int numverts)
 496 {
 497         int i, k, total;
 498         // LordHavoc: to avoid problems with aliasing (treating memory as two
 499         // different types - exactly what this is doing), these must be volatile
 500         // (or a union)
 501         volatile int *icolor;
 502         volatile float *fcolor;
 503         qbyte *bcolor;
 504
 505         total = numverts * 4;
 506
 507         // shift float to have 8bit fraction at base of number
 508         fcolor = varray_color;
 509         for (i = 0;i < total;)
 510         {
 511                 fcolor[i    ] += 32768.0f;
 512                 fcolor[i + 1] += 32768.0f;
 513                 fcolor[i + 2] += 32768.0f;
 514                 fcolor[i + 3] += 32768.0f;
 515                 i += 4;
 516         }
 517
 518         // then read as integer and kill float bits...
 519         icolor = (int *)varray_color;
 520         bcolor = varray_bcolor;
 521         for (i = 0;i < total;)
 522         {
 523                 k = icolor[i    ] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i    ] = (qbyte) k;
 524                 k = icolor[i + 1] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i + 1] = (qbyte) k;
 525                 k = icolor[i + 2] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i + 2] = (qbyte) k;
 526                 k = icolor[i + 3] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i + 3] = (qbyte) k;
 527                 i += 4;
 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         int numelements;
 546         if (numtriangles == 0 || numverts == 0)
 547         {
 548                 Con_Printf("R_Mesh_Draw(%d, %d, %08p);\n", numverts, numtriangles, elements);
 549                 return;
 550         }
 551         numelements = numtriangles * 3;
 552         c_meshs++;
 553         c_meshelements += numelements;
 554         if (gl_state.colorarray && !gl_mesh_floatcolors.integer)
 555                 GL_ConvertColorsFloatToByte(numverts);
 556         if (!r_render.integer)
 557                 return;
 558         if (gl_supportslockarrays && gl_lockarrays.integer)
 559         {
 560                 qglLockArraysEXT(0, numverts);
 561                 CHECKGLERROR
 562                 if (gl_mesh_drawrangeelements.integer && qglDrawRangeElements != NULL)
 563                         qglDrawRangeElements(GL_TRIANGLES, 0, numverts, numelements, GL_UNSIGNED_INT, (const GLuint *) elements);
 564                 else
 565                         qglDrawElements(GL_TRIANGLES, numelements, GL_UNSIGNED_INT, (const GLuint *) elements);
 566                 CHECKGLERROR
 567                 qglUnlockArraysEXT();
 568                 CHECKGLERROR
 569         }
 570         else
 571         {
 572                 qglDrawElements(GL_TRIANGLES, numelements, GL_UNSIGNED_INT, (const GLuint *) elements);
 573                 CHECKGLERROR
 574         }
 575 }
 576
 577 // restores backend state, used when done with 3D rendering
 578 void R_Mesh_Finish(void)
 579 {
 580         int i;
 581         BACKENDACTIVECHECK
 582
 583         for (i = backendunits - 1;i >= 0;i--)
 584         {
 585                 if (qglActiveTexture)
 586                         qglActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
 587                 if (qglClientActiveTexture)
 588                         qglClientActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
 589                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 590                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 591                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 592                 if (gl_texture3d)
 593                 {
 594                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 595                 }
 596                 if (gl_texturecubemap)
 597                 {
 598                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 599                 }
 600                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 601                 if (gl_combine.integer)
 602                 {
 603                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
 604                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
 605                 }
 606         }
 607         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 608         qglDisableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 609
 610         qglDisable(GL_BLEND);CHECKGLERROR
 611         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 612         qglDepthMask(GL_TRUE);CHECKGLERROR
 613         qglBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);CHECKGLERROR
 614 }
 615
 616 void R_Mesh_Matrix(const matrix4x4_t *matrix)
 617 {
 618         if (memcmp(matrix, &backend_modelmatrix, sizeof(matrix4x4_t)))
 619         {
 620                 backend_modelmatrix = *matrix;
 621                 Matrix4x4_Concat(&backend_modelviewmatrix, &backend_viewmatrix, matrix);
 622                 Matrix4x4_Transpose(&backend_glmodelviewmatrix, &backend_modelviewmatrix);
 623                 qglLoadMatrixf(&backend_glmodelviewmatrix.m[0][0]);
 624         }
 625 }
 626
 627 // sets up the requested state
 628 void R_Mesh_MainState(const rmeshstate_t *m)
 629 {
 630         BACKENDACTIVECHECK
 631
 632         if (gl_state.blendfunc1 != m->blendfunc1 || gl_state.blendfunc2 != m->blendfunc2)
 633         {
 634                 qglBlendFunc(gl_state.blendfunc1 = m->blendfunc1, gl_state.blendfunc2 = m->blendfunc2);CHECKGLERROR
 635                 if (gl_state.blendfunc2 == GL_ZERO)
 636                 {
 637                         if (gl_state.blendfunc1 == GL_ONE)
 638                         {
 639                                 if (gl_state.blend)
 640                                 {
 641                                         gl_state.blend = 0;
 642                                         qglDisable(GL_BLEND);CHECKGLERROR
 643                                 }
 644                         }
 645                         else
 646                         {
 647                                 if (!gl_state.blend)
 648                                 {
 649                                         gl_state.blend = 1;
 650                                         qglEnable(GL_BLEND);CHECKGLERROR
 651                                 }
 652                         }
 653                 }
 654                 else
 655                 {
 656                         if (!gl_state.blend)
 657                         {
 658                                 gl_state.blend = 1;
 659                                 qglEnable(GL_BLEND);CHECKGLERROR
 660                         }
 661                 }
 662         }
 663         if (gl_state.depthdisable != m->depthdisable)
 664         {
 665                 gl_state.depthdisable = m->depthdisable;
 666                 if (gl_state.depthdisable)
 667                         qglDisable(GL_DEPTH_TEST);
 668                 else
 669                         qglEnable(GL_DEPTH_TEST);
 670         }
 671         if (gl_state.depthmask != (m->blendfunc2 == GL_ZERO || m->depthwrite))
 672         {
 673                 qglDepthMask(gl_state.depthmask = (m->blendfunc2 == GL_ZERO || m->depthwrite));CHECKGLERROR
 674         }
 675 }
 676
 677 void R_Mesh_TextureState(const rmeshstate_t *m)
 678 {
 679         int i, combinergb, combinealpha;
 680         float scale;
 681         gltextureunit_t *unit;
 682
 683         BACKENDACTIVECHECK
 684
 685         if (gl_backend_rebindtextures)
 686         {
 687                 gl_backend_rebindtextures = false;
 688                 GL_SetupTextureState();
 689         }
 690
 691         for (i = 0;i < backendunits;i++)
 692         {
 693                 unit = gl_state.units + i;
 694                 if (unit->t1d != m->tex1d[i] || unit->t2d != m->tex[i] || unit->t3d != m->tex3d[i] || unit->tcubemap != m->texcubemap[i])
 695                 {
 696                         if (gl_state.unit != i)
 697                         {
 698                                 qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 699                         }
 700                         if (m->tex1d[i] || m->tex[i] || m->tex3d[i] || m->texcubemap[i])
 701                         {
 702                                 if (!unit->arrayenabled)
 703                                 {
 704                                         unit->arrayenabled = true;
 705                                         if (gl_state.clientunit != i)
 706                                         {
 707                                                 qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 708                                         }
 709                                         qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 710                                 }
 711                         }
 712                         else
 713                         {
 714                                 if (unit->arrayenabled)
 715                                 {
 716                                         unit->arrayenabled = false;
 717                                         if (gl_state.clientunit != i)
 718                                         {
 719                                                 qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 720                                         }
 721                                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 722                                 }
 723                         }
 724                         combinergb = m->texcombinergb[i];
 725                         combinealpha = m->texcombinealpha[i];
 726                         if (!combinergb)
 727                                 combinergb = GL_MODULATE;
 728                         if (!combinealpha)
 729                                 combinealpha = GL_MODULATE;
 730                         if (unit->combinergb != combinergb)
 731                         {
 732                                 unit->combinergb = combinergb;
 733                                 if (gl_combine.integer)
 734                                 {
 735                                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, unit->combinergb);CHECKGLERROR
 736                                 }
 737                                 else
 738                                 {
 739                                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, unit->combinergb);CHECKGLERROR
 740                                 }
 741                         }
 742                         if (unit->combinealpha != combinealpha)
 743                         {
 744                                 unit->combinealpha = combinealpha;
 745                                 if (gl_combine.integer)
 746                                 {
 747                                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, unit->combinealpha);CHECKGLERROR
 748                                 }
 749                         }
 750                         if (unit->t1d != m->tex1d[i])
 751                         {
 752                                 if (m->tex1d[i])
 753                                 {
 754                                         if (unit->t1d == 0)
 755                                                 qglEnable(GL_TEXTURE_1D);CHECKGLERROR
 756                                 }
 757                                 else
 758                                 {
 759                                         if (unit->t1d)
 760                                                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 761                                 }
 762                                 qglBindTexture(GL_TEXTURE_1D, (unit->t1d = m->tex1d[i]));CHECKGLERROR
 763                         }
 764                         if (unit->t2d != m->tex[i])
 765                         {
 766                                 if (m->tex[i])
 767                                 {
 768                                         if (unit->t2d == 0)
 769                                                 qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 770                                 }
 771                                 else
 772                                 {
 773                                         if (unit->t2d)
 774                                                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 775                                 }
 776                                 qglBindTexture(GL_TEXTURE_2D, (unit->t2d = m->tex[i]));CHECKGLERROR
 777                         }
 778                         if (unit->t3d != m->tex3d[i])
 779                         {
 780                                 if (m->tex3d[i])
 781                                 {
 782                                         if (unit->t3d == 0)
 783                                                 qglEnable(GL_TEXTURE_3D);CHECKGLERROR
 784                                 }
 785                                 else
 786                                 {
 787                                         if (unit->t3d)
 788                                                 qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 789                                 }
 790                                 qglBindTexture(GL_TEXTURE_3D, (unit->t3d = m->tex3d[i]));CHECKGLERROR
 791                         }
 792                         if (unit->tcubemap != m->texcubemap[i])
 793                         {
 794                                 if (m->texcubemap[i])
 795                                 {
 796                                         if (unit->tcubemap == 0)
 797                                                 qglEnable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 798                                 }
 799                                 else
 800                                 {
 801                                         if (unit->tcubemap)
 802                                                 qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 803                                 }
 804                                 qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, (unit->tcubemap = m->texcubemap[i]));CHECKGLERROR
 805                         }
 806                 }
 807                 scale = max(m->texrgbscale[i], 1);
 808                 if (gl_state.units[i].rgbscale != scale)
 809                 {
 810                         if (gl_state.unit != i)
 811                         {
 812                                 qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 813                         }
 814                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, (gl_state.units[i].rgbscale = scale));CHECKGLERROR
 815                 }
 816                 scale = max(m->texalphascale[i], 1);
 817                 if (gl_state.units[i].alphascale != scale)
 818                 {
 819                         if (gl_state.unit != i)
 820                         {
 821                                 qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 822                         }
 823                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, (gl_state.units[i].alphascale = scale));CHECKGLERROR
 824                 }
 825         }
 826 }
 827
 828 void R_Mesh_State(const rmeshstate_t *m)
 829 {
 830         R_Mesh_MainState(m);
 831         R_Mesh_TextureState(m);
 832 }
 833
 834 /*
 835 ==============================================================================
 836
 837                                                 SCREEN SHOTS
 838
 839 ==============================================================================
 840 */
 841
 842 qboolean SCR_ScreenShot(char *filename, int x, int y, int width, int height)
 843 {
 844         qboolean ret;
 845         int i;
 846         qbyte *buffer;
 847
 848         if (!r_render.integer)
 849                 return false;
 850
 851         buffer = Mem_Alloc(tempmempool, width*height*3);
 852         qglReadPixels (x, y, width, height, GL_RGB, GL_UNSIGNED_BYTE, buffer);
 853         CHECKGLERROR
 854
 855         // LordHavoc: compensate for v_overbrightbits when using hardware gamma
 856         if (v_hwgamma.integer)
 857                 for (i = 0;i < width * height * 3;i++)
 858                         buffer[i] <<= v_overbrightbits.integer;
 859
 860         ret = Image_WriteTGARGB_preflipped(filename, width, height, buffer);
 861
 862         Mem_Free(buffer);
 863         return ret;
 864 }
 865
 866 //=============================================================================
 867
 868 void R_ClearScreen(void)
 869 {
 870         if (r_render.integer)
 871         {
 872                 // clear to black
 873                 qglClearColor(0,0,0,0);CHECKGLERROR
 874                 qglClearDepth(1);CHECKGLERROR
 875                 if (gl_stencil)
 876                 {
 877                         // LordHavoc: we use a stencil centered around 128 instead of 0,
 878                         // to avoid clamping interfering with strange shadow volume
 879                         // drawing orders
 880                         qglClearStencil(128);CHECKGLERROR
 881                 }
 882                 // clear the screen
 883                 qglClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | (gl_stencil ? GL_STENCIL_BUFFER_BIT : 0));CHECKGLERROR
 884                 // set dithering mode
 885                 if (gl_dither.integer)
 886                 {
 887                         qglEnable(GL_DITHER);CHECKGLERROR
 888                 }
 889                 else
 890                 {
 891                         qglDisable(GL_DITHER);CHECKGLERROR
 892                 }
 893         }
 894 }
 895
 896 /*
 897 ==================
 898 SCR_UpdateScreen
 899
 900 This is called every frame, and can also be called explicitly to flush
 901 text to the screen.
 902 ==================
 903 */
 904 void SCR_UpdateScreen (void)
 905 {
 906         VID_Finish ();
 907
 908         R_TimeReport("finish");
 909
 910         if (r_textureunits.integer > gl_textureunits)
 911                 Cvar_SetValueQuick(&r_textureunits, gl_textureunits);
 912         if (r_textureunits.integer < 1)
 913                 Cvar_SetValueQuick(&r_textureunits, 1);
 914
 915         if (gl_combine.integer && (!gl_combine_extension || r_textureunits.integer < 2))
 916                 Cvar_SetValueQuick(&gl_combine, 0);
 917
 918         // lighting scale
 919         r_colorscale = 1.0f / (float) (1 << v_overbrightbits.integer);
 920
 921         // lightmaps only
 922         r_lightmapscalebit = v_overbrightbits.integer;
 923         if (gl_combine.integer && r_textureunits.integer > 1)
 924                 r_lightmapscalebit += 2;
 925
 926         R_TimeReport("setup");
 927
 928         R_ClearScreen();
 929
 930         R_TimeReport("clear");
 931
 932         if (scr_conlines < vid.conheight && cls.signon == SIGNONS)
 933                 R_RenderView();
 934
 935         // draw 2D stuff
 936         R_DrawQueue();
 937
 938         // tell driver to commit it's partially full geometry queue to the rendering queue
 939         // (this doesn't wait for the commands themselves to complete)
 940         qglFlush();
 941 }
 942