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