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