r_sky.c

   1
   2 #include "quakedef.h"
   3 #include "image.h"
   4
   5 // FIXME: fix skybox after vid_restart
   6 cvar_t r_sky = {CVAR_SAVE, "r_sky", "1"};
   7 cvar_t r_skyscroll1 = {CVAR_SAVE, "r_skyscroll1", "1"};
   8 cvar_t r_skyscroll2 = {CVAR_SAVE, "r_skyscroll2", "2"};
   9 qboolean skyavailable_quake;
  10 qboolean skyavailable_box;
  11 int skyrendernow;
  12 int skyrendermasked;
  13
  14 static rtexture_t *solidskytexture;
  15 static rtexture_t *alphaskytexture;
  16 static int skyrendersphere;
  17 static int skyrenderbox;
  18 static rtexturepool_t *skytexturepool;
  19 static char skyname[256];
  20
  21 typedef struct suffixinfo_s
  22 {
  23         char *suffix;
  24         qboolean flipx, flipy, flipdiagonal;
  25 }
  26 suffixinfo_t;
  27 static suffixinfo_t suffix[3][6] =
  28 {
  29         {
  30                 {"px",   false, false, false},
  31                 {"nx",   false, false, false},
  32                 {"py",   false, false, false},
  33                 {"ny",   false, false, false},
  34                 {"pz",   false, false, false},
  35                 {"nz",   false, false, false}
  36         },
  37         {
  38                 {"posx", false, false, false},
  39                 {"negx", false, false, false},
  40                 {"posy", false, false, false},
  41                 {"negy", false, false, false},
  42                 {"posz", false, false, false},
  43                 {"negz", false, false, false}
  44         },
  45         {
  46                 {"rt",    true, false,  true},
  47                 {"lf",   false,  true,  true},
  48                 {"ft",    true,  true, false},
  49                 {"bk",   false, false, false},
  50                 {"up",    true, false,  true},
  51                 {"dn",    true, false,  true}
  52         }
  53 };
  54
  55 static rtexture_t *skyboxside[6];
  56
  57 void R_SkyStartFrame(void)
  58 {
  59         skyrendernow = false;
  60         skyrendersphere = false;
  61         skyrenderbox = false;
  62         skyrendermasked = false;
  63         if (r_sky.integer && !fogenabled)
  64         {
  65                 if (skyavailable_box)
  66                         skyrenderbox = true;
  67                 else if (skyavailable_quake)
  68                         skyrendersphere = true;
  69                 // for depth-masked sky, render the sky on the first sky surface encountered
  70                 skyrendernow = true;
  71                 skyrendermasked = true;
  72         }
  73 }
  74
  75 /*
  76 ==================
  77 R_SetSkyBox
  78 ==================
  79 */
  80 void R_UnloadSkyBox(void)
  81 {
  82         int i;
  83         for (i = 0;i < 6;i++)
  84         {
  85                 if (skyboxside[i])
  86                         R_FreeTexture(skyboxside[i]);
  87                 skyboxside[i] = NULL;
  88         }
  89 }
  90
  91 void R_LoadSkyBox(void)
  92 {
  93         int i, j;
  94         int indices[4] = {0,1,2,3};
  95         char name[1024];
  96         qbyte *image_rgba;
  97         qbyte *temp;
  98         R_UnloadSkyBox();
  99         if (!skyname[0])
 100                 return;
 101
 102         for (j=0; j<3; j++)
 103         {
 104                 for (i=0; i<6; i++)
 105                 {
 106                         if (snprintf(name, sizeof(name), "%s_%s", skyname, suffix[j][i].suffix) >= (int)sizeof(name) || !(image_rgba = loadimagepixels(name, false, 0, 0)))
 107                         {
 108                                 if (snprintf(name, sizeof(name), "%s%s", skyname, suffix[j][i].suffix) >= (int)sizeof(name) || !(image_rgba = loadimagepixels(name, false, 0, 0)))
 109                                 {
 110                                         if (snprintf(name, sizeof(name), "env/%s%s", skyname, suffix[j][i].suffix) >= (int)sizeof(name) || !(image_rgba = loadimagepixels(name, false, 0, 0)))
 111                                         {
 112                                                 if (snprintf(name, sizeof(name), "gfx/env/%s%s", skyname, suffix[j][i].suffix) >= (int)sizeof(name) || !(image_rgba = loadimagepixels(name, false, 0, 0)))
 113                                                         continue;
 114                                         }
 115                                 }
 116                         }
 117                         temp = Mem_Alloc(tempmempool, image_width*image_height*4);
 118                         Image_CopyMux (temp, image_rgba, image_width, image_height, suffix[j][i].flipx, suffix[j][i].flipy, suffix[j][i].flipdiagonal, 4, 4, indices);
 119                         skyboxside[i] = R_LoadTexture2D(skytexturepool, va("skyboxside%d", i), image_width, image_height, temp, TEXTYPE_RGBA, TEXF_CLAMP | TEXF_PRECACHE, NULL);
 120                         Mem_Free(image_rgba);
 121                         Mem_Free(temp);
 122                 }
 123
 124                 for (i=0; i<6; i++)
 125                 {
 126                         if (skyboxside[i] == NULL)
 127                         {
 128                                 R_UnloadSkyBox();
 129                                 break;
 130                         }
 131                 }
 132
 133                 if (skyboxside[0] != NULL)
 134                         return;
 135         }
 136
 137         Con_Printf ("Failed to load %s as skybox\n", skyname);
 138 }
 139
 140 int R_SetSkyBox(const char *sky)
 141 {
 142         if (strcmp(sky, skyname) == 0) // no change
 143                 return true;
 144
 145         if (strlen(sky) > 1000)
 146         {
 147                 Con_Printf("sky name too long (%i, max is 1000)\n", strlen(sky));
 148                 return false;
 149         }
 150
 151         skyavailable_box = false;
 152         strcpy(skyname, sky);
 153
 154         R_UnloadSkyBox();
 155         R_LoadSkyBox();
 156
 157         if (!skyname[0])
 158                 return true;
 159
 160         if (skyboxside[0] || skyboxside[1] || skyboxside[2] || skyboxside[3] || skyboxside[4] || skyboxside[5])
 161         {
 162                 skyavailable_box = true;
 163                 return true;
 164         }
 165         return false;
 166 }
 167
 168 // LordHavoc: added LoadSky console command
 169 void LoadSky_f (void)
 170 {
 171         switch (Cmd_Argc())
 172         {
 173         case 1:
 174                 if (skyname[0])
 175                         Con_Printf("current sky: %s\n", skyname);
 176                 else
 177                         Con_Print("no skybox has been set\n");
 178                 break;
 179         case 2:
 180                 if (R_SetSkyBox(Cmd_Argv(1)))
 181                 {
 182                         if (skyname[0])
 183                                 Con_Printf("skybox set to %s\n", skyname);
 184                         else
 185                                 Con_Print("skybox disabled\n");
 186                 }
 187                 else
 188                         Con_Printf("failed to load skybox %s\n", Cmd_Argv(1));
 189                 break;
 190         default:
 191                 Con_Print("usage: loadsky skyname\n");
 192                 break;
 193         }
 194 }
 195
 196 float skyboxvertex3f[6*4*3] =
 197 {
 198         // skyside[0]
 199          16, -16,  16,
 200          16, -16, -16,
 201          16,  16, -16,
 202          16,  16,  16,
 203         // skyside[1]
 204         -16,  16,  16,
 205         -16,  16, -16,
 206         -16, -16, -16,
 207         -16, -16,  16,
 208         // skyside[2]
 209          16,  16,  16,
 210          16,  16, -16,
 211         -16,  16, -16,
 212         -16,  16,  16,
 213         // skyside[3]
 214         -16, -16,  16,
 215         -16, -16, -16,
 216          16, -16, -16,
 217          16, -16,  16,
 218         // skyside[4]
 219         -16, -16,  16,
 220          16, -16,  16,
 221          16,  16,  16,
 222         -16,  16,  16,
 223         // skyside[5]
 224          16, -16, -16,
 225         -16, -16, -16,
 226         -16,  16, -16,
 227          16,  16, -16
 228 };
 229
 230 float skyboxtexcoord2f[6*4*2] =
 231 {
 232         // skyside[0]
 233         0, 1,
 234         1, 1,
 235         1, 0,
 236         0, 0,
 237         // skyside[1]
 238         1, 0,
 239         0, 0,
 240         0, 1,
 241         1, 1,
 242         // skyside[2]
 243         1, 1,
 244         1, 0,
 245         0, 0,
 246         0, 1,
 247         // skyside[3]
 248         0, 0,
 249         0, 1,
 250         1, 1,
 251         1, 0,
 252         // skyside[4]
 253         0, 1,
 254         1, 1,
 255         1, 0,
 256         0, 0,
 257         // skyside[5]
 258         0, 1,
 259         1, 1,
 260         1, 0,
 261         0, 0
 262 };
 263
 264 int skyboxelements[6*2*3] =
 265 {
 266         // skyside[3]
 267          0,  1,  2,
 268          0,  2,  3,
 269         // skyside[1]
 270          4,  5,  6,
 271          4,  6,  7,
 272         // skyside[0]
 273          8,  9, 10,
 274          8, 10, 11,
 275         // skyside[2]
 276         12, 13, 14,
 277         12, 14, 15,
 278         // skyside[4]
 279         16, 17, 18,
 280         16, 18, 19,
 281         // skyside[5]
 282         20, 21, 22,
 283         20, 22, 23
 284 };
 285
 286 static void R_SkyBox(void)
 287 {
 288         int i;
 289         rmeshstate_t m;
 290         GL_Color(1, 1, 1, 1);
 291         memset(&m, 0, sizeof(m));
 292         GL_BlendFunc(GL_ONE, GL_ZERO);
 293         GL_DepthMask(true);
 294         GL_DepthTest(false); // don't modify or read zbuffer
 295         m.pointer_vertex = skyboxvertex3f;
 296         m.pointer_texcoord[0] = skyboxtexcoord2f;
 297         GL_LockArrays(0, 6*4);
 298         for (i = 0;i < 6;i++)
 299         {
 300                 m.tex[0] = R_GetTexture(skyboxside[i]);
 301                 R_Mesh_State(&m);
 302                 R_Mesh_Draw(6*4, 2, skyboxelements + i * 6);
 303         }
 304         GL_LockArrays(0, 0);
 305 }
 306
 307 #define skygridx 32
 308 #define skygridx1 (skygridx + 1)
 309 #define skygridxrecip (1.0f / (skygridx))
 310 #define skygridy 32
 311 #define skygridy1 (skygridy + 1)
 312 #define skygridyrecip (1.0f / (skygridy))
 313 #define skysphere_numverts (skygridx1 * skygridy1)
 314 #define skysphere_numtriangles (skygridx * skygridy * 2)
 315 static float skysphere_vertex3f[skysphere_numverts * 3];
 316 static float skysphere_texcoord2f[skysphere_numverts * 2];
 317 static int skysphere_element3i[skysphere_numtriangles * 3];
 318
 319 static void skyspherecalc(void)
 320 {
 321         int i, j, *e;
 322         float a, b, x, ax, ay, v[3], length, *vertex3f, *texcoord2f;
 323         float dx, dy, dz;
 324         dx = 16;
 325         dy = 16;
 326         dz = 16 / 3;
 327         vertex3f = skysphere_vertex3f;
 328         texcoord2f = skysphere_texcoord2f;
 329         for (j = 0;j <= skygridy;j++)
 330         {
 331                 a = j * skygridyrecip;
 332                 ax = cos(a * M_PI * 2);
 333                 ay = -sin(a * M_PI * 2);
 334                 for (i = 0;i <= skygridx;i++)
 335                 {
 336                         b = i * skygridxrecip;
 337                         x = cos((b + 0.5) * M_PI);
 338                         v[0] = ax*x * dx;
 339                         v[1] = ay*x * dy;
 340                         v[2] = -sin((b + 0.5) * M_PI) * dz;
 341                         length = 3.0f / sqrt(v[0]*v[0]+v[1]*v[1]+(v[2]*v[2]*9));
 342                         *texcoord2f++ = v[0] * length;
 343                         *texcoord2f++ = v[1] * length;
 344                         *vertex3f++ = v[0];
 345                         *vertex3f++ = v[1];
 346                         *vertex3f++ = v[2];
 347                 }
 348         }
 349         e = skysphere_element3i;
 350         for (j = 0;j < skygridy;j++)
 351         {
 352                 for (i = 0;i < skygridx;i++)
 353                 {
 354                         *e++ =  j      * skygridx1 + i;
 355                         *e++ =  j      * skygridx1 + i + 1;
 356                         *e++ = (j + 1) * skygridx1 + i;
 357
 358                         *e++ =  j      * skygridx1 + i + 1;
 359                         *e++ = (j + 1) * skygridx1 + i + 1;
 360                         *e++ = (j + 1) * skygridx1 + i;
 361                 }
 362         }
 363 }
 364
 365 static void R_SkySphere(void)
 366 {
 367         float speedscale;
 368         static qboolean skysphereinitialized = false;
 369         rmeshstate_t m;
 370         matrix4x4_t scroll1matrix, scroll2matrix;
 371         if (!skysphereinitialized)
 372         {
 373                 skysphereinitialized = true;
 374                 skyspherecalc();
 375         }
 376
 377         // wrap the scroll values just to be extra kind to float accuracy
 378
 379         // scroll speed for upper layer
 380         speedscale = cl.time*r_skyscroll1.value*8.0/128.0;
 381         speedscale -= (int)speedscale;
 382         Matrix4x4_CreateTranslate(&scroll1matrix, speedscale, speedscale, 0);
 383         // scroll speed for lower layer (transparent layer)
 384         speedscale = cl.time*r_skyscroll2.value*8.0/128.0;
 385         speedscale -= (int)speedscale;
 386         Matrix4x4_CreateTranslate(&scroll2matrix, speedscale, speedscale, 0);
 387
 388         GL_Color(1, 1, 1, 1);
 389         GL_BlendFunc(GL_ONE, GL_ZERO);
 390         GL_DepthMask(true);
 391         GL_DepthTest(false); // don't modify or read zbuffer
 392         memset(&m, 0, sizeof(m));
 393         m.pointer_vertex = skysphere_vertex3f;
 394         m.tex[0] = R_GetTexture(solidskytexture);
 395         m.pointer_texcoord[0] = skysphere_texcoord2f;
 396         m.texmatrix[0] = scroll1matrix;
 397         if (r_textureunits.integer >= 2)
 398         {
 399                 // one pass using GL_DECAL or GL_INTERPOLATE_ARB for alpha layer
 400                 m.tex[1] = R_GetTexture(alphaskytexture);
 401                 m.texcombinergb[1] = gl_combine.integer ? GL_INTERPOLATE_ARB : GL_DECAL;
 402                 m.pointer_texcoord[1] = skysphere_texcoord2f;
 403                 m.texmatrix[1] = scroll2matrix;
 404                 R_Mesh_State(&m);
 405                 GL_LockArrays(0, skysphere_numverts);
 406                 R_Mesh_Draw(skysphere_numverts, skysphere_numtriangles, skysphere_element3i);
 407                 GL_LockArrays(0, 0);
 408         }
 409         else
 410         {
 411                 // two pass
 412                 R_Mesh_State(&m);
 413                 GL_LockArrays(0, skysphere_numverts);
 414                 R_Mesh_Draw(skysphere_numverts, skysphere_numtriangles, skysphere_element3i);
 415                 GL_LockArrays(0, 0);
 416
 417                 GL_BlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 418                 m.tex[0] = R_GetTexture(alphaskytexture);
 419                 m.texmatrix[0] = scroll2matrix;
 420                 R_Mesh_State(&m);
 421                 GL_LockArrays(0, skysphere_numverts);
 422                 R_Mesh_Draw(skysphere_numverts, skysphere_numtriangles, skysphere_element3i);
 423                 GL_LockArrays(0, 0);
 424         }
 425 }
 426
 427 void R_Sky(void)
 428 {
 429         matrix4x4_t skymatrix;
 430         if (skyrendermasked)
 431         {
 432                 Matrix4x4_CreateTranslate(&skymatrix, r_vieworigin[0], r_vieworigin[1], r_vieworigin[2]);
 433                 R_Mesh_Matrix(&skymatrix);
 434                 if (skyrendersphere)
 435                 {
 436                         // this does not modify depth buffer
 437                         R_SkySphere();
 438                 }
 439                 else if (skyrenderbox)
 440                 {
 441                         // this does not modify depth buffer
 442                         R_SkyBox();
 443                 }
 444                 /* this will be skyroom someday
 445                 else
 446                 {
 447                         // this modifies the depth buffer so we have to clear it afterward
 448                         //R_SkyRoom();
 449                         // clear the depthbuffer that was used while rendering the skyroom
 450                         //GL_Clear(GL_DEPTH_BUFFER_BIT);
 451                 }
 452                 */
 453         }
 454 }
 455
 456 //===============================================================
 457
 458 /*
 459 =============
 460 R_InitSky
 461
 462 A sky texture is 256*128, with the right side being a masked overlay
 463 ==============
 464 */
 465 void R_InitSky (qbyte *src, int bytesperpixel)
 466 {
 467         int i, j;
 468         unsigned solidpixels[128*128], alphapixels[128*128];
 469
 470         skyavailable_quake = true;
 471
 472         // flush skytexturepool so we won't build up a leak from uploading textures multiple times
 473         R_FreeTexturePool(&skytexturepool);
 474         skytexturepool = R_AllocTexturePool();
 475         solidskytexture = NULL;
 476         alphaskytexture = NULL;
 477
 478         if (bytesperpixel == 4)
 479         {
 480                 for (i = 0;i < 128;i++)
 481                 {
 482                         for (j = 0;j < 128;j++)
 483                         {
 484                                 solidpixels[(i*128) + j] = ((unsigned *)src)[i*256+j+128];
 485                                 alphapixels[(i*128) + j] = ((unsigned *)src)[i*256+j];
 486                         }
 487                 }
 488         }
 489         else
 490         {
 491                 // make an average value for the back to avoid
 492                 // a fringe on the top level
 493                 int p, r, g, b;
 494                 union
 495                 {
 496                         unsigned int i;
 497                         unsigned char b[4];
 498                 }
 499                 rgba;
 500                 r = g = b = 0;
 501                 for (i = 0;i < 128;i++)
 502                 {
 503                         for (j = 0;j < 128;j++)
 504                         {
 505                                 rgba.i = palette_complete[src[i*256 + j + 128]];
 506                                 r += rgba.b[0];
 507                                 g += rgba.b[1];
 508                                 b += rgba.b[2];
 509                         }
 510                 }
 511                 rgba.b[0] = r/(128*128);
 512                 rgba.b[1] = g/(128*128);
 513                 rgba.b[2] = b/(128*128);
 514                 rgba.b[3] = 0;
 515                 for (i = 0;i < 128;i++)
 516                 {
 517                         for (j = 0;j < 128;j++)
 518                         {
 519                                 solidpixels[(i*128) + j] = palette_complete[src[i*256 + j + 128]];
 520                                 alphapixels[(i*128) + j] = (p = src[i*256 + j]) ? palette_complete[p] : rgba.i;
 521                         }
 522                 }
 523         }
 524
 525         solidskytexture = R_LoadTexture2D(skytexturepool, "sky_solidtexture", 128, 128, (qbyte *) solidpixels, TEXTYPE_RGBA, TEXF_PRECACHE, NULL);
 526         alphaskytexture = R_LoadTexture2D(skytexturepool, "sky_alphatexture", 128, 128, (qbyte *) alphapixels, TEXTYPE_RGBA, TEXF_ALPHA | TEXF_PRECACHE, NULL);
 527 }
 528
 529 void R_ResetQuakeSky(void)
 530 {
 531         skyavailable_quake = false;
 532 }
 533
 534 void R_ResetSkyBox(void)
 535 {
 536         skyboxside[0] = skyboxside[1] = skyboxside[2] = skyboxside[3] = skyboxside[4] = skyboxside[5] = NULL;
 537         skyname[0] = 0;
 538         skyavailable_box = false;
 539 }
 540
 541 static void r_sky_start(void)
 542 {
 543         skytexturepool = R_AllocTexturePool();
 544         solidskytexture = NULL;
 545         alphaskytexture = NULL;
 546         R_LoadSkyBox();
 547 }
 548
 549 static void r_sky_shutdown(void)
 550 {
 551         R_UnloadSkyBox();
 552         R_FreeTexturePool(&skytexturepool);
 553         solidskytexture = NULL;
 554         alphaskytexture = NULL;
 555 }
 556
 557 static void r_sky_newmap(void)
 558 {
 559 }
 560
 561 void R_Sky_Init(void)
 562 {
 563         Cmd_AddCommand ("loadsky", &LoadSky_f);
 564         Cvar_RegisterVariable (&r_sky);
 565         Cvar_RegisterVariable (&r_skyscroll1);
 566         Cvar_RegisterVariable (&r_skyscroll2);
 567         R_ResetSkyBox();
 568         R_ResetQuakeSky();
 569         R_RegisterModule("R_Sky", r_sky_start, r_sky_shutdown, r_sky_newmap);
 570 }
 571