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                 m.tex[1] = R_GetTexture(alphaskytexture);
 336                 m.texcombinergb[1] = gl_combine.integer ? GL_INTERPOLATE_ARB : GL_DECAL;
 337                 m.pointer_texcoord[1] = skysphere_texcoord2f;
 338                 R_Mesh_State_Texture(&m);
 339                 R_Mesh_TextureMatrix(1, &scroll2matrix);
 340                 R_Mesh_Draw(skysphere_numverts, skysphere_numtriangles, skysphere_element3i);
 341                 R_Mesh_TextureMatrix(1, &identitymatrix);
 342         }
 343         else
 344         {
 345                 // two pass
 346                 R_Mesh_State_Texture(&m);
 347                 R_Mesh_Draw(skysphere_numverts, skysphere_numtriangles, skysphere_element3i);
 348
 349                 GL_BlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 350                 m.tex[0] = R_GetTexture(alphaskytexture);
 351                 R_Mesh_State_Texture(&m);
 352                 R_Mesh_TextureMatrix(0, &scroll2matrix);
 353                 R_Mesh_Draw(skysphere_numverts, skysphere_numtriangles, skysphere_element3i);
 354         }
 355         R_Mesh_TextureMatrix(0, &identitymatrix);
 356 }
 357
 358 void R_Sky(void)
 359 {
 360         matrix4x4_t skymatrix;
 361         if (skyrendermasked)
 362         {
 363                 Matrix4x4_CreateTranslate(&skymatrix, r_vieworigin[0], r_vieworigin[1], r_vieworigin[2]);
 364                 R_Mesh_Matrix(&skymatrix);
 365                 if (skyrendersphere)
 366                 {
 367                         // this does not modify depth buffer
 368                         R_SkySphere();
 369                 }
 370                 else if (skyrenderbox)
 371                 {
 372                         // this does not modify depth buffer
 373                         R_SkyBox();
 374                 }
 375                 /* this will be skyroom someday
 376                 else
 377                 {
 378                         // this modifies the depth buffer so we have to clear it afterward
 379                         //R_SkyRoom();
 380                         // clear the depthbuffer that was used while rendering the skyroom
 381                         //qglClear(GL_DEPTH_BUFFER_BIT);
 382                 }
 383                 */
 384         }
 385 }
 386
 387 //===============================================================
 388
 389 /*
 390 =============
 391 R_InitSky
 392
 393 A sky texture is 256*128, with the right side being a masked overlay
 394 ==============
 395 */
 396 void R_InitSky (qbyte *src, int bytesperpixel)
 397 {
 398         int i, j;
 399         unsigned solidpixels[128*128], alphapixels[128*128];
 400
 401         skyavailable_quake = true;
 402
 403         // flush skytexturepool so we won't build up a leak from uploading textures multiple times
 404         R_FreeTexturePool(&skytexturepool);
 405         skytexturepool = R_AllocTexturePool();
 406         solidskytexture = NULL;
 407         alphaskytexture = NULL;
 408
 409         if (bytesperpixel == 4)
 410         {
 411                 for (i = 0;i < 128;i++)
 412                 {
 413                         for (j = 0;j < 128;j++)
 414                         {
 415                                 solidpixels[(i*128) + j] = ((unsigned *)src)[i*256+j+128];
 416                                 alphapixels[(i*128) + j] = ((unsigned *)src)[i*256+j];
 417                         }
 418                 }
 419         }
 420         else
 421         {
 422                 // make an average value for the back to avoid
 423                 // a fringe on the top level
 424                 int p, r, g, b;
 425                 union
 426                 {
 427                         unsigned int i;
 428                         unsigned char b[4];
 429                 }
 430                 rgba;
 431                 r = g = b = 0;
 432                 for (i = 0;i < 128;i++)
 433                 {
 434                         for (j = 0;j < 128;j++)
 435                         {
 436                                 rgba.i = palette_complete[src[i*256 + j + 128]];
 437                                 r += rgba.b[0];
 438                                 g += rgba.b[1];
 439                                 b += rgba.b[2];
 440                         }
 441                 }
 442                 rgba.b[0] = r/(128*128);
 443                 rgba.b[1] = g/(128*128);
 444                 rgba.b[2] = b/(128*128);
 445                 rgba.b[3] = 0;
 446                 for (i = 0;i < 128;i++)
 447                 {
 448                         for (j = 0;j < 128;j++)
 449                         {
 450                                 solidpixels[(i*128) + j] = palette_complete[src[i*256 + j + 128]];
 451                                 alphapixels[(i*128) + j] = (p = src[i*256 + j]) ? palette_complete[p] : rgba.i;
 452                         }
 453                 }
 454         }
 455
 456         solidskytexture = R_LoadTexture2D(skytexturepool, "sky_solidtexture", 128, 128, (qbyte *) solidpixels, TEXTYPE_RGBA, TEXF_PRECACHE, NULL);
 457         alphaskytexture = R_LoadTexture2D(skytexturepool, "sky_alphatexture", 128, 128, (qbyte *) alphapixels, TEXTYPE_RGBA, TEXF_ALPHA | TEXF_PRECACHE, NULL);
 458 }
 459
 460 void R_ResetQuakeSky(void)
 461 {
 462         skyavailable_quake = false;
 463 }
 464
 465 void R_ResetSkyBox(void)
 466 {
 467         skyboxside[0] = skyboxside[1] = skyboxside[2] = skyboxside[3] = skyboxside[4] = skyboxside[5] = NULL;
 468         skyname[0] = 0;
 469         skyavailable_box = false;
 470 }
 471
 472 static void r_sky_start(void)
 473 {
 474         skytexturepool = R_AllocTexturePool();
 475         solidskytexture = NULL;
 476         alphaskytexture = NULL;
 477         R_LoadSkyBox();
 478 }
 479
 480 static void r_sky_shutdown(void)
 481 {
 482         R_UnloadSkyBox();
 483         R_FreeTexturePool(&skytexturepool);
 484         solidskytexture = NULL;
 485         alphaskytexture = NULL;
 486 }
 487
 488 static void r_sky_newmap(void)
 489 {
 490 }
 491
 492 void R_Sky_Init(void)
 493 {
 494         Cmd_AddCommand ("loadsky", &LoadSky_f);
 495         Cvar_RegisterVariable (&r_sky);
 496         R_ResetSkyBox();
 497         R_ResetQuakeSky();
 498         R_RegisterModule("R_Sky", r_sky_start, r_sky_shutdown, r_sky_newmap);
 499 }
 500