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         // 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         float nudge, m[16];
 264
 265         if (!r_render.integer)
 266                 return;
 267
 268         // set up viewpoint
 269         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 270         // set view pyramid
 271         nudge = 1.0 - 1.0 / (1<<23);
 272         m[ 0] = 1.0 / tan(fovx * M_PI / 360.0);
 273         m[ 1] = 0;
 274         m[ 2] = 0;
 275         m[ 3] = 0;
 276         m[ 4] = 0;
 277         m[ 5] = 1.0 / tan(fovy * M_PI / 360.0);
 278         m[ 6] = 0;
 279         m[ 7] = 0;
 280         m[ 8] = 0;
 281         m[ 9] = 0;
 282         m[10] = -1 * nudge;
 283         m[11] = -1 * nudge;
 284         m[12] = 0;
 285         m[13] = 0;
 286         m[14] = -2 * zNear * nudge;
 287         m[15] = 0;
 288         qglLoadMatrixf(m);
 289         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 290         GL_SetupView_Orientation_Identity();
 291         backend_projectmatrix.m[0][0] = m[0];
 292         backend_projectmatrix.m[1][0] = m[1];
 293         backend_projectmatrix.m[2][0] = m[2];
 294         backend_projectmatrix.m[3][0] = m[3];
 295         backend_projectmatrix.m[0][1] = m[4];
 296         backend_projectmatrix.m[1][1] = m[5];
 297         backend_projectmatrix.m[2][1] = m[6];
 298         backend_projectmatrix.m[3][1] = m[7];
 299         backend_projectmatrix.m[0][2] = m[8];
 300         backend_projectmatrix.m[1][2] = m[9];
 301         backend_projectmatrix.m[2][2] = m[10];
 302         backend_projectmatrix.m[3][2] = m[11];
 303         backend_projectmatrix.m[0][3] = m[12];
 304         backend_projectmatrix.m[1][3] = m[13];
 305         backend_projectmatrix.m[2][3] = m[14];
 306         backend_projectmatrix.m[3][3] = m[15];
 307 }
 308
 309 void GL_SetupView_Mode_Ortho (double x1, double y1, double x2, double y2, double zNear, double zFar)
 310 {
 311         if (!r_render.integer)
 312                 return;
 313
 314         // set up viewpoint
 315         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 316         qglOrtho(x1, x2, y2, y1, zNear, zFar);
 317         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 318         GL_SetupView_Orientation_Identity();
 319 }
 320
 321 typedef struct gltextureunit_s
 322 {
 323         int t1d, t2d, t3d, tcubemap;
 324         int arrayenabled;
 325         float rgbscale, alphascale;
 326         int combinergb, combinealpha;
 327         // FIXME: add more combine stuff
 328 }
 329 gltextureunit_t;
 330
 331 static struct
 332 {
 333         int blendfunc1;
 334         int blendfunc2;
 335         int blend;
 336         GLboolean depthmask;
 337         int depthdisable;
 338         int unit;
 339         int clientunit;
 340         gltextureunit_t units[MAX_TEXTUREUNITS];
 341         int colorarray;
 342 }
 343 gl_state;
 344
 345 void GL_SetupTextureState(void)
 346 {
 347         int i;
 348         gltextureunit_t *unit;
 349         for (i = 0;i < backendunits;i++)
 350         {
 351                 if (qglActiveTexture)
 352                         qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 353                 if (qglClientActiveTexture)
 354                         qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 355                 unit = gl_state.units + i;
 356                 unit->t1d = 0;
 357                 unit->t2d = 0;
 358                 unit->t3d = 0;
 359                 unit->tcubemap = 0;
 360                 unit->rgbscale = 1;
 361                 unit->alphascale = 1;
 362                 unit->combinergb = GL_MODULATE;
 363                 unit->combinealpha = GL_MODULATE;
 364                 unit->arrayenabled = false;
 365                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 366                 if (gl_texture3d || gl_texturecubemap)
 367                 {
 368                         qglTexCoordPointer(3, GL_FLOAT, sizeof(float[4]), varray_texcoord[i]);CHECKGLERROR
 369                 }
 370                 else
 371                 {
 372                         qglTexCoordPointer(2, GL_FLOAT, sizeof(float[4]), varray_texcoord[i]);CHECKGLERROR
 373                 }
 374                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 375                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 376                 if (gl_texture3d)
 377                 {
 378                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 379                 }
 380                 if (gl_texturecubemap)
 381                 {
 382                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 383                 }
 384                 if (gl_combine.integer)
 385                 {
 386                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);CHECKGLERROR
 387                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_MODULATE);CHECKGLERROR
 388                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE);CHECKGLERROR
 389                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 390                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_RGB_ARB, GL_CONSTANT_ARB);CHECKGLERROR
 391                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 392                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 393                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_RGB_ARB, GL_SRC_ALPHA);CHECKGLERROR
 394                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, GL_MODULATE);CHECKGLERROR
 395                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA_ARB, GL_TEXTURE);CHECKGLERROR
 396                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_ALPHA_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 397                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_ALPHA_ARB, GL_CONSTANT_ARB);CHECKGLERROR
 398                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 399                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 400                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 401                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
 402                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
 403                 }
 404                 else
 405                 {
 406                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 407                 }
 408         }
 409 }
 410
 411 void GL_Backend_ResetState(void)
 412 {
 413         memset(&gl_state, 0, sizeof(gl_state));
 414         gl_state.depthdisable = false;
 415         gl_state.blendfunc1 = GL_ONE;
 416         gl_state.blendfunc2 = GL_ZERO;
 417         gl_state.blend = false;
 418         gl_state.depthmask = GL_TRUE;
 419         gl_state.colorarray = false;
 420
 421         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 422         qglDisableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 423
 424         qglEnable(GL_CULL_FACE);CHECKGLERROR
 425         qglCullFace(GL_FRONT);CHECKGLERROR
 426         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 427         qglBlendFunc(gl_state.blendfunc1, gl_state.blendfunc2);CHECKGLERROR
 428         qglDisable(GL_BLEND);CHECKGLERROR
 429         qglDepthMask(gl_state.depthmask);CHECKGLERROR
 430         qglVertexPointer(3, GL_FLOAT, sizeof(float[4]), varray_vertex);CHECKGLERROR
 431         qglEnableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 432         if (gl_mesh_floatcolors.integer)
 433         {
 434                 qglColorPointer(4, GL_FLOAT, sizeof(float[4]), varray_color);CHECKGLERROR
 435         }
 436         else
 437         {
 438                 qglColorPointer(4, GL_UNSIGNED_BYTE, sizeof(qbyte[4]), varray_bcolor);CHECKGLERROR
 439         }
 440         GL_Color(1, 1, 1, 1);
 441
 442         GL_SetupTextureState();
 443 }
 444
 445 void GL_UseColorArray(void)
 446 {
 447         if (!gl_state.colorarray)
 448         {
 449                 gl_state.colorarray = true;
 450                 qglEnableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 451         }
 452 }
 453
 454 void GL_Color(float cr, float cg, float cb, float ca)
 455 {
 456         if (gl_state.colorarray)
 457         {
 458                 gl_state.colorarray = false;
 459                 qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 460         }
 461         qglColor4f(cr, cg, cb, ca);
 462 }
 463
 464 void GL_TransformToScreen(const vec4_t in, vec4_t out)
 465 {
 466         vec4_t temp;
 467         float iw;
 468         Matrix4x4_Transform4 (&backend_viewmatrix, in, temp);
 469         Matrix4x4_Transform4 (&backend_projectmatrix, temp, out);
 470         iw = 1.0f / out[3];
 471         out[0] = r_refdef.x + (out[0] * iw + 1.0f) * r_refdef.width * 0.5f;
 472         out[1] = r_refdef.y + (out[1] * iw + 1.0f) * r_refdef.height * 0.5f;
 473         out[2] = out[2] * iw;
 474 }
 475
 476 // called at beginning of frame
 477 void R_Mesh_Start(void)
 478 {
 479         BACKENDACTIVECHECK
 480
 481         CHECKGLERROR
 482
 483         GL_Backend_CheckCvars();
 484         if (mesh_maxverts != gl_mesh_maxverts.integer)
 485                 GL_Backend_ResizeArrays(gl_mesh_maxverts.integer);
 486
 487         GL_Backend_ResetState();
 488 }
 489
 490 int gl_backend_rebindtextures;
 491
 492 void GL_ConvertColorsFloatToByte(int numverts)
 493 {
 494         int i, k, total;
 495         // LordHavoc: to avoid problems with aliasing (treating memory as two
 496         // different types - exactly what this is doing), these must be volatile
 497         // (or a union)
 498         volatile int *icolor;
 499         volatile float *fcolor;
 500         qbyte *bcolor;
 501
 502         total = numverts * 4;
 503
 504         // shift float to have 8bit fraction at base of number
 505         fcolor = varray_color;
 506         for (i = 0;i < total;)
 507         {
 508                 fcolor[i    ] += 32768.0f;
 509                 fcolor[i + 1] += 32768.0f;
 510                 fcolor[i + 2] += 32768.0f;
 511                 fcolor[i + 3] += 32768.0f;
 512                 i += 4;
 513         }
 514
 515         // then read as integer and kill float bits...
 516         icolor = (int *)varray_color;
 517         bcolor = varray_bcolor;
 518         for (i = 0;i < total;)
 519         {
 520                 k = icolor[i    ] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i    ] = (qbyte) k;
 521                 k = icolor[i + 1] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i + 1] = (qbyte) k;
 522                 k = icolor[i + 2] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i + 2] = (qbyte) k;
 523                 k = icolor[i + 3] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i + 3] = (qbyte) k;
 524                 i += 4;
 525         }
 526 }
 527
 528 // enlarges geometry buffers if they are too small
 529 void _R_Mesh_ResizeCheck(int numverts)
 530 {
 531         if (numverts > mesh_maxverts)
 532         {
 533                 BACKENDACTIVECHECK
 534                 GL_Backend_ResizeArrays(numverts + 100);
 535                 GL_Backend_ResetState();
 536         }
 537 }
 538
 539 // renders the mesh
 540 void R_Mesh_Draw(int numverts, int numtriangles, const int *elements)
 541 {
 542         int numelements;
 543         if (numtriangles == 0 || numverts == 0)
 544         {
 545                 Con_Printf("R_Mesh_Draw(%d, %d, %08p);\n", numverts, numtriangles, elements);
 546                 return;
 547         }
 548         numelements = numtriangles * 3;
 549         c_meshs++;
 550         c_meshelements += numelements;
 551         if (gl_state.colorarray && !gl_mesh_floatcolors.integer)
 552                 GL_ConvertColorsFloatToByte(numverts);
 553         if (!r_render.integer)
 554                 return;
 555         if (gl_supportslockarrays && gl_lockarrays.integer)
 556         {
 557                 qglLockArraysEXT(0, numverts);
 558                 CHECKGLERROR
 559                 if (gl_mesh_drawrangeelements.integer && qglDrawRangeElements != NULL)
 560                         qglDrawRangeElements(GL_TRIANGLES, 0, numverts, numelements, GL_UNSIGNED_INT, (const GLuint *) elements);
 561                 else
 562                         qglDrawElements(GL_TRIANGLES, numelements, GL_UNSIGNED_INT, (const GLuint *) elements);
 563                 CHECKGLERROR
 564                 qglUnlockArraysEXT();
 565                 CHECKGLERROR
 566         }
 567         else
 568         {
 569                 qglDrawElements(GL_TRIANGLES, numelements, GL_UNSIGNED_INT, (const GLuint *) elements);
 570                 CHECKGLERROR
 571         }
 572 }
 573
 574 // restores backend state, used when done with 3D rendering
 575 void R_Mesh_Finish(void)
 576 {
 577         int i;
 578         BACKENDACTIVECHECK
 579
 580         for (i = backendunits - 1;i >= 0;i--)
 581         {
 582                 if (qglActiveTexture)
 583                         qglActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
 584                 if (qglClientActiveTexture)
 585                         qglClientActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
 586                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 587                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 588                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 589                 if (gl_texture3d)
 590                 {
 591                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 592                 }
 593                 if (gl_texturecubemap)
 594                 {
 595                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 596                 }
 597                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 598                 if (gl_combine.integer)
 599                 {
 600                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
 601                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
 602                 }
 603         }
 604         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 605         qglDisableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 606
 607         qglDisable(GL_BLEND);CHECKGLERROR
 608         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 609         qglDepthMask(GL_TRUE);CHECKGLERROR
 610         qglBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);CHECKGLERROR
 611 }
 612
 613 void R_Mesh_Matrix(const matrix4x4_t *matrix)
 614 {
 615         if (memcmp(matrix, &backend_modelmatrix, sizeof(matrix4x4_t)))
 616         {
 617                 backend_modelmatrix = *matrix;
 618                 Matrix4x4_Concat(&backend_modelviewmatrix, &backend_viewmatrix, matrix);
 619                 Matrix4x4_Transpose(&backend_glmodelviewmatrix, &backend_modelviewmatrix);
 620                 qglLoadMatrixf(&backend_glmodelviewmatrix.m[0][0]);
 621         }
 622 }
 623
 624 // sets up the requested state
 625 void R_Mesh_MainState(const rmeshstate_t *m)
 626 {
 627         BACKENDACTIVECHECK
 628
 629         if (gl_state.blendfunc1 != m->blendfunc1 || gl_state.blendfunc2 != m->blendfunc2)
 630         {
 631                 qglBlendFunc(gl_state.blendfunc1 = m->blendfunc1, gl_state.blendfunc2 = m->blendfunc2);CHECKGLERROR
 632                 if (gl_state.blendfunc2 == GL_ZERO)
 633                 {
 634                         if (gl_state.blendfunc1 == GL_ONE)
 635                         {
 636                                 if (gl_state.blend)
 637                                 {
 638                                         gl_state.blend = 0;
 639                                         qglDisable(GL_BLEND);CHECKGLERROR
 640                                 }
 641                         }
 642                         else
 643                         {
 644                                 if (!gl_state.blend)
 645                                 {
 646                                         gl_state.blend = 1;
 647                                         qglEnable(GL_BLEND);CHECKGLERROR
 648                                 }
 649                         }
 650                 }
 651                 else
 652                 {
 653                         if (!gl_state.blend)
 654                         {
 655                                 gl_state.blend = 1;
 656                                 qglEnable(GL_BLEND);CHECKGLERROR
 657                         }
 658                 }
 659         }
 660         if (gl_state.depthdisable != m->depthdisable)
 661         {
 662                 gl_state.depthdisable = m->depthdisable;
 663                 if (gl_state.depthdisable)
 664                         qglDisable(GL_DEPTH_TEST);
 665                 else
 666                         qglEnable(GL_DEPTH_TEST);
 667         }
 668         if (gl_state.depthmask != (m->blendfunc2 == GL_ZERO || m->depthwrite))
 669         {
 670                 qglDepthMask(gl_state.depthmask = (m->blendfunc2 == GL_ZERO || m->depthwrite));CHECKGLERROR
 671         }
 672 }
 673
 674 void R_Mesh_TextureState(const rmeshstate_t *m)
 675 {
 676         int i, combinergb, combinealpha;
 677         float scale;
 678         gltextureunit_t *unit;
 679
 680         BACKENDACTIVECHECK
 681
 682         if (gl_backend_rebindtextures)
 683         {
 684                 gl_backend_rebindtextures = false;
 685                 GL_SetupTextureState();
 686         }
 687
 688         for (i = 0;i < backendunits;i++)
 689         {
 690                 unit = gl_state.units + i;
 691                 if (unit->t1d != m->tex1d[i] || unit->t2d != m->tex[i] || unit->t3d != m->tex3d[i] || unit->tcubemap != m->texcubemap[i])
 692                 {
 693                         if (gl_state.unit != i)
 694                         {
 695                                 qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 696                         }
 697                         if (m->tex1d[i] || m->tex[i] || m->tex3d[i] || m->texcubemap[i])
 698                         {
 699                                 if (!unit->arrayenabled)
 700                                 {
 701                                         unit->arrayenabled = true;
 702                                         if (gl_state.clientunit != i)
 703                                         {
 704                                                 qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 705                                         }
 706                                         qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 707                                 }
 708                         }
 709                         else
 710                         {
 711                                 if (unit->arrayenabled)
 712                                 {
 713                                         unit->arrayenabled = false;
 714                                         if (gl_state.clientunit != i)
 715                                         {
 716                                                 qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 717                                         }
 718                                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 719                                 }
 720                         }
 721                         combinergb = m->texcombinergb[i];
 722                         combinealpha = m->texcombinealpha[i];
 723                         if (!combinergb)
 724                                 combinergb = GL_MODULATE;
 725                         if (!combinealpha)
 726                                 combinealpha = GL_MODULATE;
 727                         if (unit->combinergb != combinergb)
 728                         {
 729                                 unit->combinergb = combinergb;
 730                                 if (gl_combine.integer)
 731                                 {
 732                                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, unit->combinergb);CHECKGLERROR
 733                                 }
 734                                 else
 735                                 {
 736                                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, unit->combinergb);CHECKGLERROR
 737                                 }
 738                         }
 739                         if (unit->combinealpha != combinealpha)
 740                         {
 741                                 unit->combinealpha = combinealpha;
 742                                 if (gl_combine.integer)
 743                                 {
 744                                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, unit->combinealpha);CHECKGLERROR
 745                                 }
 746                         }
 747                         if (unit->t1d != m->tex1d[i])
 748                         {
 749                                 if (m->tex1d[i])
 750                                 {
 751                                         if (unit->t1d == 0)
 752                                                 qglEnable(GL_TEXTURE_1D);CHECKGLERROR
 753                                 }
 754                                 else
 755                                 {
 756                                         if (unit->t1d)
 757                                                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 758                                 }
 759                                 qglBindTexture(GL_TEXTURE_1D, (unit->t1d = m->tex1d[i]));CHECKGLERROR
 760                         }
 761                         if (unit->t2d != m->tex[i])
 762                         {
 763                                 if (m->tex[i])
 764                                 {
 765                                         if (unit->t2d == 0)
 766                                                 qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 767                                 }
 768                                 else
 769                                 {
 770                                         if (unit->t2d)
 771                                                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 772                                 }
 773                                 qglBindTexture(GL_TEXTURE_2D, (unit->t2d = m->tex[i]));CHECKGLERROR
 774                         }
 775                         if (unit->t3d != m->tex3d[i])
 776                         {
 777                                 if (m->tex3d[i])
 778                                 {
 779                                         if (unit->t3d == 0)
 780                                                 qglEnable(GL_TEXTURE_3D);CHECKGLERROR
 781                                 }
 782                                 else
 783                                 {
 784                                         if (unit->t3d)
 785                                                 qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 786                                 }
 787                                 qglBindTexture(GL_TEXTURE_3D, (unit->t3d = m->tex3d[i]));CHECKGLERROR
 788                         }
 789                         if (unit->tcubemap != m->texcubemap[i])
 790                         {
 791                                 if (m->texcubemap[i])
 792                                 {
 793                                         if (unit->tcubemap == 0)
 794                                                 qglEnable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 795                                 }
 796                                 else
 797                                 {
 798                                         if (unit->tcubemap)
 799                                                 qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 800                                 }
 801                                 qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, (unit->tcubemap = m->texcubemap[i]));CHECKGLERROR
 802                         }
 803                 }
 804                 scale = max(m->texrgbscale[i], 1);
 805                 if (gl_state.units[i].rgbscale != scale)
 806                 {
 807                         if (gl_state.unit != i)
 808                         {
 809                                 qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 810                         }
 811                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, (gl_state.units[i].rgbscale = scale));CHECKGLERROR
 812                 }
 813                 scale = max(m->texalphascale[i], 1);
 814                 if (gl_state.units[i].alphascale != scale)
 815                 {
 816                         if (gl_state.unit != i)
 817                         {
 818                                 qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 819                         }
 820                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, (gl_state.units[i].alphascale = scale));CHECKGLERROR
 821                 }
 822         }
 823 }
 824
 825 void R_Mesh_State(const rmeshstate_t *m)
 826 {
 827         R_Mesh_MainState(m);
 828         R_Mesh_TextureState(m);
 829 }
 830
 831 /*
 832 ==============================================================================
 833
 834                                                 SCREEN SHOTS
 835
 836 ==============================================================================
 837 */
 838
 839 qboolean SCR_ScreenShot(char *filename, int x, int y, int width, int height)
 840 {
 841         qboolean ret;
 842         int i;
 843         qbyte *buffer;
 844
 845         if (!r_render.integer)
 846                 return false;
 847
 848         buffer = Mem_Alloc(tempmempool, width*height*3);
 849         qglReadPixels (x, y, width, height, GL_RGB, GL_UNSIGNED_BYTE, buffer);
 850         CHECKGLERROR
 851
 852         // LordHavoc: compensate for v_overbrightbits when using hardware gamma
 853         if (v_hwgamma.integer)
 854                 for (i = 0;i < width * height * 3;i++)
 855                         buffer[i] <<= v_overbrightbits.integer;
 856
 857         ret = Image_WriteTGARGB_preflipped(filename, width, height, buffer);
 858
 859         Mem_Free(buffer);
 860         return ret;
 861 }
 862
 863 //=============================================================================
 864
 865 void R_ClearScreen(void)
 866 {
 867         if (r_render.integer)
 868         {
 869                 // clear to black
 870                 qglClearColor(0,0,0,0);CHECKGLERROR
 871                 qglClearDepth(1);CHECKGLERROR
 872                 if (gl_stencil)
 873                 {
 874                         // LordHavoc: we use a stencil centered around 128 instead of 0,
 875                         // to avoid clamping interfering with strange shadow volume
 876                         // drawing orders
 877                         qglClearStencil(128);CHECKGLERROR
 878                 }
 879                 // clear the screen
 880                 qglClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | (gl_stencil ? GL_STENCIL_BUFFER_BIT : 0));CHECKGLERROR
 881                 // set dithering mode
 882                 if (gl_dither.integer)
 883                 {
 884                         qglEnable(GL_DITHER);CHECKGLERROR
 885                 }
 886                 else
 887                 {
 888                         qglDisable(GL_DITHER);CHECKGLERROR
 889                 }
 890         }
 891 }
 892
 893 /*
 894 ==================
 895 SCR_UpdateScreen
 896
 897 This is called every frame, and can also be called explicitly to flush
 898 text to the screen.
 899 ==================
 900 */
 901 void SCR_UpdateScreen (void)
 902 {
 903         VID_Finish ();
 904
 905         R_TimeReport("finish");
 906
 907         if (r_textureunits.integer > gl_textureunits)
 908                 Cvar_SetValueQuick(&r_textureunits, gl_textureunits);
 909         if (r_textureunits.integer < 1)
 910                 Cvar_SetValueQuick(&r_textureunits, 1);
 911
 912         if (gl_combine.integer && (!gl_combine_extension || r_textureunits.integer < 2))
 913                 Cvar_SetValueQuick(&gl_combine, 0);
 914
 915         // lighting scale
 916         r_colorscale = 1.0f / (float) (1 << v_overbrightbits.integer);
 917
 918         // lightmaps only
 919         r_lightmapscalebit = v_overbrightbits.integer;
 920         if (gl_combine.integer && r_textureunits.integer > 1)
 921                 r_lightmapscalebit += 2;
 922
 923         R_TimeReport("setup");
 924
 925         R_ClearScreen();
 926
 927         R_TimeReport("clear");
 928
 929         if (scr_conlines < vid.conheight && cls.signon == SIGNONS)
 930                 R_RenderView();
 931
 932         // draw 2D stuff
 933         R_DrawQueue();
 934
 935         // tell driver to commit it's partially full geometry queue to the rendering queue
 936         // (this doesn't wait for the commands themselves to complete)
 937         qglFlush();
 938 }
 939