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 qboolean skyavailable_quake;
   8 qboolean skyavailable_box;
   9 int skyrendernow;
  10 int skyrendermasked;
  11
  12 static rtexture_t *solidskytexture;
  13 static rtexture_t *alphaskytexture;
  14 static int skyrendersphere;
  15 static int skyrenderbox;
  16 static rtexturepool_t *skytexturepool;
  17 static char skyname[256];
  18 static char *suf[6] = {"rt", "bk", "lf", "ft", "up", "dn"};
  19 static rtexture_t *skyboxside[6];
  20
  21 void R_SkyStartFrame(void)
  22 {
  23         skyrendernow = false;
  24         skyrendersphere = false;
  25         skyrenderbox = false;
  26         skyrendermasked = false;
  27         if (r_sky.integer && !fogenabled)
  28         {
  29                 if (skyavailable_box)
  30                         skyrenderbox = true;
  31                 else if (skyavailable_quake)
  32                         skyrendersphere = true;
  33                 // for depth-masked sky, render the sky on the first sky surface encountered
  34                 skyrendernow = true;
  35                 skyrendermasked = true;
  36         }
  37 }
  38
  39 /*
  40 ==================
  41 R_SetSkyBox
  42 ==================
  43 */
  44 void R_UnloadSkyBox(void)
  45 {
  46         int i;
  47         for (i = 0;i < 6;i++)
  48         {
  49                 if (skyboxside[i])
  50                         R_FreeTexture(skyboxside[i]);
  51                 skyboxside[i] = NULL;;
  52         }
  53 }
  54
  55 void R_LoadSkyBox(void)
  56 {
  57         int i;
  58         char name[1024];
  59         qbyte *image_rgba;
  60         R_UnloadSkyBox();
  61         if (!skyname[0])
  62                 return;
  63         for (i = 0;i < 6;i++)
  64         {
  65                 if (snprintf(name, sizeof(name), "env/%s%s", skyname, suf[i]) >= (int)sizeof(name) || !(image_rgba = loadimagepixels(name, false, 0, 0)))
  66                 {
  67                         if (snprintf(name, sizeof(name), "gfx/env/%s%s", skyname, suf[i]) >= (int)sizeof(name) || !(image_rgba = loadimagepixels(name, false, 0, 0)))
  68                         {
  69                                 Con_Printf ("Couldn't load env/%s%s or gfx/env/%s%s\n", skyname, suf[i], skyname, suf[i]);
  70                                 continue;
  71                         }
  72                 }
  73                 skyboxside[i] = R_LoadTexture2D(skytexturepool, va("skyboxside%d", i), image_width, image_height, image_rgba, TEXTYPE_RGBA, TEXF_CLAMP | TEXF_PRECACHE, NULL);
  74                 Mem_Free(image_rgba);
  75         }
  76 }
  77
  78 int R_SetSkyBox(const char *sky)
  79 {
  80         if (strcmp(sky, skyname) == 0) // no change
  81                 return true;
  82
  83         if (strlen(sky) > 1000)
  84         {
  85                 Con_Printf ("sky name too long (%i, max is 1000)\n", strlen(sky));
  86                 return false;
  87         }
  88
  89         skyavailable_box = false;
  90         strcpy(skyname, sky);
  91
  92         R_UnloadSkyBox();
  93         R_LoadSkyBox();
  94
  95         if (!skyname[0])
  96                 return true;
  97
  98         if (skyboxside[0] || skyboxside[1] || skyboxside[2] || skyboxside[3] || skyboxside[4] || skyboxside[5])
  99         {
 100                 skyavailable_box = true;
 101                 return true;
 102         }
 103         return false;
 104 }
 105
 106 // LordHavoc: added LoadSky console command
 107 void LoadSky_f (void)
 108 {
 109         switch (Cmd_Argc())
 110         {
 111         case 1:
 112                 if (skyname[0])
 113                         Con_Printf("current sky: %s\n", skyname);
 114                 else
 115                         Con_Printf("no skybox has been set\n");
 116                 break;
 117         case 2:
 118                 if (R_SetSkyBox(Cmd_Argv(1)))
 119                 {
 120                         if (skyname[0])
 121                                 Con_Printf("skybox set to %s\n", skyname);
 122                         else
 123                                 Con_Printf("skybox disabled\n");
 124                 }
 125                 else
 126                         Con_Printf("failed to load skybox %s\n", Cmd_Argv(1));
 127                 break;
 128         default:
 129                 Con_Printf("usage: loadsky skyname\n");
 130                 break;
 131         }
 132 }
 133
 134 float skyboxvertex3f[6*4*3] =
 135 {
 136         // skyside[0]
 137          16,  16,  16,
 138          16,  16, -16,
 139         -16,  16, -16,
 140         -16,  16,  16,
 141         // skyside[1]
 142         -16,  16,  16,
 143         -16,  16, -16,
 144         -16, -16, -16,
 145         -16, -16,  16,
 146         // skyside[2]
 147         -16, -16,  16,
 148         -16, -16, -16,
 149          16, -16, -16,
 150          16, -16,  16,
 151         // skyside[3]
 152          16, -16,  16,
 153          16, -16, -16,
 154          16,  16, -16,
 155          16,  16,  16,
 156         // skyside[4]
 157          16, -16,  16,
 158          16,  16,  16,
 159         -16,  16,  16,
 160         -16, -16,  16,
 161         // skyside[5]
 162          16,  16, -16,
 163          16, -16, -16,
 164         -16, -16, -16,
 165         -16,  16, -16
 166 };
 167
 168 float skyboxtexcoord2f[6*4*2] =
 169 {
 170         // skyside[0]
 171         1, 0,
 172         1, 1,
 173         0, 1,
 174         0, 0,
 175         // skyside[1]
 176         1, 0,
 177         1, 1,
 178         0, 1,
 179         0, 0,
 180         // skyside[2]
 181         1, 0,
 182         1, 1,
 183         0, 1,
 184         0, 0,
 185         // skyside[3]
 186         1, 0,
 187         1, 1,
 188         0, 1,
 189         0, 0,
 190         // skyside[4]
 191         1, 0,
 192         1, 1,
 193         0, 1,
 194         0, 0,
 195         // skyside[5]
 196         1, 0,
 197         1, 1,
 198         0, 1,
 199         0, 0
 200 };
 201
 202 int skyboxelements[6*2*3] =
 203 {
 204         // skyside[3]
 205          0,  1,  2,
 206          0,  2,  3,
 207         // skyside[1]
 208          4,  5,  6,
 209          4,  6,  7,
 210         // skyside[0]
 211          8,  9, 10,
 212          8, 10, 11,
 213         // skyside[2]
 214         12, 13, 14,
 215         12, 14, 15,
 216         // skyside[4]
 217         16, 17, 18,
 218         16, 18, 19,
 219         // skyside[5]
 220         20, 21, 22,
 221         20, 22, 23
 222 };
 223
 224 static void R_SkyBox(void)
 225 {
 226         int i;
 227         rmeshstate_t m;
 228         GL_Color(1, 1, 1, 1);
 229         memset(&m, 0, sizeof(m));
 230         GL_BlendFunc(GL_ONE, GL_ZERO);
 231         GL_DepthMask(true);
 232         GL_DepthTest(false); // don't modify or read zbuffer
 233         GL_VertexPointer(skyboxvertex3f);
 234         m.pointer_texcoord[0] = skyboxtexcoord2f;
 235         for (i = 0;i < 6;i++)
 236         {
 237                 m.tex[0] = R_GetTexture(skyboxside[i]);
 238                 R_Mesh_State_Texture(&m);
 239                 R_Mesh_Draw(6*4, 2, skyboxelements + i * 6);
 240         }
 241 }
 242
 243 #define skygridx 32
 244 #define skygridx1 (skygridx + 1)
 245 #define skygridxrecip (1.0f / (skygridx))
 246 #define skygridy 32
 247 #define skygridy1 (skygridy + 1)
 248 #define skygridyrecip (1.0f / (skygridy))
 249 #define skysphere_numverts (skygridx1 * skygridy1)
 250 #define skysphere_numtriangles (skygridx * skygridy * 2)
 251 static float skysphere_vertex3f[skysphere_numverts * 3];
 252 static float skysphere_texcoord2f[skysphere_numverts * 2];
 253 static int skysphere_element3i[skysphere_numtriangles * 3];
 254
 255 static void skyspherecalc(void)
 256 {
 257         int i, j, *e;
 258         float a, b, x, ax, ay, v[3], length, *vertex3f, *texcoord2f;
 259         float dx, dy, dz;
 260         dx = 16;
 261         dy = 16;
 262         dz = 16 / 3;
 263         vertex3f = skysphere_vertex3f;
 264         texcoord2f = skysphere_texcoord2f;
 265         for (j = 0;j <= skygridy;j++)
 266         {
 267                 a = j * skygridyrecip;
 268                 ax = cos(a * M_PI * 2);
 269                 ay = -sin(a * M_PI * 2);
 270                 for (i = 0;i <= skygridx;i++)
 271                 {
 272                         b = i * skygridxrecip;
 273                         x = cos((b + 0.5) * M_PI);
 274                         v[0] = ax*x * dx;
 275                         v[1] = ay*x * dy;
 276                         v[2] = -sin((b + 0.5) * M_PI) * dz;
 277                         length = 3.0f / sqrt(v[0]*v[0]+v[1]*v[1]+(v[2]*v[2]*9));
 278                         *texcoord2f++ = v[0] * length;
 279                         *texcoord2f++ = v[1] * length;
 280                         *vertex3f++ = v[0];
 281                         *vertex3f++ = v[1];
 282                         *vertex3f++ = v[2];
 283                 }
 284         }
 285         e = skysphere_element3i;
 286         for (j = 0;j < skygridy;j++)
 287         {
 288                 for (i = 0;i < skygridx;i++)
 289                 {
 290                         *e++ =  j      * skygridx1 + i;
 291                         *e++ =  j      * skygridx1 + i + 1;
 292                         *e++ = (j + 1) * skygridx1 + i;
 293
 294                         *e++ =  j      * skygridx1 + i + 1;
 295                         *e++ = (j + 1) * skygridx1 + i + 1;
 296                         *e++ = (j + 1) * skygridx1 + i;
 297                 }
 298         }
 299 }
 300
 301 static void R_SkySphere(void)
 302 {
 303         float speedscale;
 304         static qboolean skysphereinitialized = false;
 305         rmeshstate_t m;
 306         matrix4x4_t scroll1matrix, scroll2matrix, identitymatrix;
 307         if (!skysphereinitialized)
 308         {
 309                 skysphereinitialized = true;
 310                 skyspherecalc();
 311         }
 312
 313         // scroll speed for upper layer
 314         speedscale = cl.time*8.0/128.0;
 315         // wrap the scroll just to be extra kind to float accuracy
 316         speedscale -= (int)speedscale;
 317
 318         // scroll the lower cloud layer twice as fast (just like quake did)
 319         Matrix4x4_CreateTranslate(&scroll1matrix, speedscale, speedscale, 0);
 320         Matrix4x4_CreateTranslate(&scroll2matrix, speedscale * 2, speedscale * 2, 0);
 321         Matrix4x4_CreateIdentity(&identitymatrix);
 322
 323         GL_VertexPointer(skysphere_vertex3f);
 324         GL_Color(1, 1, 1, 1);
 325         GL_BlendFunc(GL_ONE, GL_ZERO);
 326         GL_DepthMask(true);
 327         GL_DepthTest(false); // don't modify or read zbuffer
 328         memset(&m, 0, sizeof(m));
 329         m.tex[0] = R_GetTexture(solidskytexture);
 330         m.pointer_texcoord[0] = skysphere_texcoord2f;
 331         R_Mesh_TextureMatrix(0, &scroll1matrix);
 332         if (r_textureunits.integer >= 2)
 333         {
 334                 // one pass using GL_DECAL or GL_INTERPOLATE_ARB for alpha layer
 335                 // LordHavoc: note that color is not set here because it does not
 336                 // matter with GL_REPLACE
 337                 m.tex[1] = R_GetTexture(alphaskytexture);
 338                 m.texcombinergb[1] = gl_combine.integer ? GL_INTERPOLATE_ARB : GL_DECAL;
 339                 m.pointer_texcoord[1] = skysphere_texcoord2f;
 340                 R_Mesh_State_Texture(&m);
 341                 R_Mesh_TextureMatrix(1, &scroll2matrix);
 342                 R_Mesh_Draw(skysphere_numverts, skysphere_numtriangles, skysphere_element3i);
 343                 R_Mesh_TextureMatrix(1, &identitymatrix);
 344         }
 345         else
 346         {
 347                 // two pass
 348                 R_Mesh_State_Texture(&m);
 349                 R_Mesh_Draw(skysphere_numverts, skysphere_numtriangles, skysphere_element3i);
 350
 351                 GL_BlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 352                 m.tex[0] = R_GetTexture(alphaskytexture);
 353                 R_Mesh_State_Texture(&m);
 354                 R_Mesh_TextureMatrix(0, &scroll2matrix);
 355                 R_Mesh_Draw(skysphere_numverts, skysphere_numtriangles, skysphere_element3i);
 356         }
 357         R_Mesh_TextureMatrix(0, &identitymatrix);
 358 }
 359
 360 void R_Sky(void)
 361 {
 362         matrix4x4_t skymatrix;
 363         if (skyrendermasked)
 364         {
 365                 Matrix4x4_CreateTranslate(&skymatrix, r_vieworigin[0], r_vieworigin[1], r_vieworigin[2]);
 366                 R_Mesh_Matrix(&skymatrix);
 367                 if (skyrendersphere)
 368                 {
 369                         // this does not modify depth buffer
 370                         R_SkySphere();
 371                 }
 372                 else if (skyrenderbox)
 373                 {
 374                         // this does not modify depth buffer
 375                         R_SkyBox();
 376                 }
 377                 /* this will be skyroom someday
 378                 else
 379                 {
 380                         // this modifies the depth buffer so we have to clear it afterward
 381                         //R_SkyRoom();
 382                         // clear the depthbuffer that was used while rendering the skyroom
 383                         //qglClear(GL_DEPTH_BUFFER_BIT);
 384                 }
 385                 */
 386         }
 387 }
 388
 389 //===============================================================
 390
 391 /*
 392 =============
 393 R_InitSky
 394
 395 A sky texture is 256*128, with the right side being a masked overlay
 396 ==============
 397 */
 398 void R_InitSky (qbyte *src, int bytesperpixel)
 399 {
 400         int i, j, p, r, g, b;
 401         qbyte skyupperlayerpixels[128*128*4], skylowerlayerpixels[128*128*4];
 402         unsigned trans[128*128], transpix, *rgba;
 403         union
 404         {
 405                 int i;
 406                 qbyte b[4];
 407         }
 408         transpixunion;
 409
 410         skyavailable_quake = true;
 411
 412         // flush skytexturepool so we won't build up a leak from uploading textures multiple times
 413         R_FreeTexturePool(&skytexturepool);
 414         skytexturepool = R_AllocTexturePool();
 415         solidskytexture = NULL;
 416         alphaskytexture = NULL;
 417
 418         if (bytesperpixel == 4)
 419         {
 420                 transpixunion.i = 0;
 421                 for (i = 0;i < 128;i++)
 422                         for (j = 0;j < 128;j++)
 423                                 trans[(i*128) + j] = ((unsigned *)src)[i*256+j+128];
 424         }
 425         else
 426         {
 427                 // make an average value for the back to avoid
 428                 // a fringe on the top level
 429                 r = g = b = 0;
 430                 for (i=0 ; i<128 ; i++)
 431                 {
 432                         for (j=0 ; j<128 ; j++)
 433                         {
 434                                 p = src[i*256 + j + 128];
 435                                 rgba = &palette_complete[p];
 436                                 trans[(i*128) + j] = *rgba;
 437                                 r += ((qbyte *)rgba)[0];
 438                                 g += ((qbyte *)rgba)[1];
 439                                 b += ((qbyte *)rgba)[2];
 440                         }
 441                 }
 442
 443                 transpixunion.i = 0;
 444                 transpixunion.b[0] = r/(128*128);
 445                 transpixunion.b[1] = g/(128*128);
 446                 transpixunion.b[2] = b/(128*128);
 447                 transpixunion.b[3] = 0;
 448         }
 449         transpix = transpixunion.i;
 450
 451         memcpy(skyupperlayerpixels, trans, 128*128*4);
 452
 453         solidskytexture = R_LoadTexture2D(skytexturepool, "sky_solidtexture", 128, 128, (qbyte *) trans, TEXTYPE_RGBA, TEXF_PRECACHE, NULL);
 454
 455         if (bytesperpixel == 4)
 456         {
 457                 for (i = 0;i < 128;i++)
 458                         for (j = 0;j < 128;j++)
 459                                 trans[(i*128) + j] = ((unsigned *)src)[i*256+j];
 460         }
 461         else
 462         {
 463                 for (i=0 ; i<128 ; i++)
 464                 {
 465                         for (j=0 ; j<128 ; j++)
 466                         {
 467                                 p = src[i*256 + j];
 468                                 if (p == 0)
 469                                         trans[(i*128) + j] = transpix;
 470                                 else
 471                                         trans[(i*128) + j] = palette_complete[p];
 472                         }
 473                 }
 474         }
 475
 476         memcpy(skylowerlayerpixels, trans, 128*128*4);
 477
 478         alphaskytexture = R_LoadTexture2D(skytexturepool, "sky_alphatexture", 128, 128, (qbyte *) trans, TEXTYPE_RGBA, TEXF_ALPHA | TEXF_PRECACHE, NULL);
 479 }
 480
 481 void R_ResetQuakeSky(void)
 482 {
 483         skyavailable_quake = false;
 484 }
 485
 486 void R_ResetSkyBox(void)
 487 {
 488         skyboxside[0] = skyboxside[1] = skyboxside[2] = skyboxside[3] = skyboxside[4] = skyboxside[5] = NULL;
 489         skyname[0] = 0;
 490         skyavailable_box = false;
 491 }
 492
 493 static void r_sky_start(void)
 494 {
 495         skytexturepool = R_AllocTexturePool();
 496         solidskytexture = NULL;
 497         alphaskytexture = NULL;
 498         R_LoadSkyBox();
 499 }
 500
 501 static void r_sky_shutdown(void)
 502 {
 503         R_UnloadSkyBox();
 504         R_FreeTexturePool(&skytexturepool);
 505         solidskytexture = NULL;
 506         alphaskytexture = NULL;
 507 }
 508
 509 static void r_sky_newmap(void)
 510 {
 511 }
 512
 513 void R_Sky_Init(void)
 514 {
 515         Cmd_AddCommand ("loadsky", &LoadSky_f);
 516         Cvar_RegisterVariable (&r_sky);
 517         R_ResetSkyBox();
 518         R_ResetQuakeSky();
 519         R_RegisterModule("R_Sky", r_sky_start, r_sky_shutdown, r_sky_newmap);
 520 }
 521