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", "enables sky rendering (black otherwise)"};
   7 cvar_t r_skyscroll1 = {CVAR_SAVE, "r_skyscroll1", "1", "speed at which upper clouds layer scrolls in quake sky"};
   8 cvar_t r_skyscroll2 = {CVAR_SAVE, "r_skyscroll2", "2", "speed at which lower clouds layer scrolls in quake sky"};
   9 int skyrendernow;
  10 int skyrendermasked;
  11
  12 static int skyrendersphere;
  13 static int skyrenderbox;
  14 static rtexturepool_t *skytexturepool;
  15 static char skyname[MAX_QPATH];
  16
  17 typedef struct suffixinfo_s
  18 {
  19         const char *suffix;
  20         qboolean flipx, flipy, flipdiagonal;
  21 }
  22 suffixinfo_t;
  23 static const suffixinfo_t suffix[3][6] =
  24 {
  25         {
  26                 {"px",   false, false, false},
  27                 {"nx",   false, false, false},
  28                 {"py",   false, false, false},
  29                 {"ny",   false, false, false},
  30                 {"pz",   false, false, false},
  31                 {"nz",   false, false, false}
  32         },
  33         {
  34                 {"posx", false, false, false},
  35                 {"negx", false, false, false},
  36                 {"posy", false, false, false},
  37                 {"negy", false, false, false},
  38                 {"posz", false, false, false},
  39                 {"negz", false, false, false}
  40         },
  41         {
  42                 {"rt",   false, false,  true},
  43                 {"lf",    true,  true,  true},
  44                 {"bk",   false,  true, false},
  45                 {"ft",    true, false, false},
  46                 {"up",   false, false,  true},
  47                 {"dn",   false, false,  true}
  48         }
  49 };
  50
  51 static rtexture_t *skyboxside[6];
  52
  53 void R_SkyStartFrame(void)
  54 {
  55         skyrendernow = false;
  56         skyrendersphere = false;
  57         skyrenderbox = false;
  58         skyrendermasked = false;
  59         if (r_sky.integer && !(r_refdef.fogenabled && r_refdef.fogmasktable[FOGMASKTABLEWIDTH-1] < (1.0f / 256.0f)))
  60         {
  61                 if (skyboxside[0] || skyboxside[1] || skyboxside[2] || skyboxside[3] || skyboxside[4] || skyboxside[5])
  62                         skyrenderbox = true;
  63                 else if (r_refdef.scene.worldmodel && r_refdef.scene.worldmodel->brush.solidskytexture)
  64                         skyrendersphere = true;
  65                 // for depth-masked sky, render the sky on the first sky surface encountered
  66                 skyrendernow = true;
  67                 skyrendermasked = true;
  68         }
  69 }
  70
  71 /*
  72 ==================
  73 R_SetSkyBox
  74 ==================
  75 */
  76 void R_UnloadSkyBox(void)
  77 {
  78         int i;
  79         int c = 0;
  80         for (i = 0;i < 6;i++)
  81         {
  82                 if (skyboxside[i])
  83                 {
  84                         R_FreeTexture(skyboxside[i]);
  85                         c++;
  86                 }
  87                 skyboxside[i] = NULL;
  88         }
  89         if (c && developer_loading.integer)
  90                 Con_Printf("unloading skybox\n");
  91 }
  92
  93 int R_LoadSkyBox(void)
  94 {
  95         int i, j, success;
  96         int indices[4] = {0,1,2,3};
  97         char name[MAX_INPUTLINE];
  98         unsigned char *image_buffer;
  99         unsigned char *temp;
 100
 101         R_UnloadSkyBox();
 102
 103         if (!skyname[0])
 104                 return true;
 105
 106         for (j=0; j<3; j++)
 107         {
 108                 success = 0;
 109                 for (i=0; i<6; i++)
 110                 {
 111                         if (dpsnprintf(name, sizeof(name), "%s_%s", skyname, suffix[j][i].suffix) < 0 || !(image_buffer = loadimagepixelsbgra(name, false, false)))
 112                         {
 113                                 if (dpsnprintf(name, sizeof(name), "%s%s", skyname, suffix[j][i].suffix) < 0 || !(image_buffer = loadimagepixelsbgra(name, false, false)))
 114                                 {
 115                                         if (dpsnprintf(name, sizeof(name), "env/%s%s", skyname, suffix[j][i].suffix) < 0 || !(image_buffer = loadimagepixelsbgra(name, false, false)))
 116                                         {
 117                                                 if (dpsnprintf(name, sizeof(name), "gfx/env/%s%s", skyname, suffix[j][i].suffix) < 0 || !(image_buffer = loadimagepixelsbgra(name, false, false)))
 118                                                         continue;
 119                                         }
 120                                 }
 121                         }
 122                         temp = (unsigned char *)Mem_Alloc(tempmempool, image_width*image_height*4);
 123                         Image_CopyMux (temp, image_buffer, image_width, image_height, suffix[j][i].flipx, suffix[j][i].flipy, suffix[j][i].flipdiagonal, 4, 4, indices);
 124                         skyboxside[i] = R_LoadTexture2D(skytexturepool, va("skyboxside%d", i), image_width, image_height, temp, TEXTYPE_BGRA, TEXF_CLAMP | TEXF_PRECACHE | (gl_texturecompression_sky.integer ? TEXF_COMPRESS : 0), NULL);
 125                         Mem_Free(image_buffer);
 126                         Mem_Free(temp);
 127                         success++;
 128                 }
 129
 130                 if (success)
 131                         break;
 132         }
 133
 134         if (j == 3)
 135                 return false;
 136
 137         if (developer_loading.integer)
 138                 Con_Printf("loading skybox \"%s\"\n", name);
 139
 140         return true;
 141 }
 142
 143 int R_SetSkyBox(const char *sky)
 144 {
 145         if (strcmp(sky, skyname) == 0) // no change
 146                 return true;
 147
 148         if (strlen(sky) > 1000)
 149         {
 150                 Con_Printf("sky name too long (%i, max is 1000)\n", (int)strlen(sky));
 151                 return false;
 152         }
 153
 154         strlcpy(skyname, sky, sizeof(skyname));
 155
 156         return R_LoadSkyBox();
 157 }
 158
 159 // LordHavoc: added LoadSky console command
 160 void LoadSky_f (void)
 161 {
 162         switch (Cmd_Argc())
 163         {
 164         case 1:
 165                 if (skyname[0])
 166                         Con_Printf("current sky: %s\n", skyname);
 167                 else
 168                         Con_Print("no skybox has been set\n");
 169                 break;
 170         case 2:
 171                 if (R_SetSkyBox(Cmd_Argv(1)))
 172                 {
 173                         if (skyname[0])
 174                                 Con_Printf("skybox set to %s\n", skyname);
 175                         else
 176                                 Con_Print("skybox disabled\n");
 177                 }
 178                 else
 179                         Con_Printf("failed to load skybox %s\n", Cmd_Argv(1));
 180                 break;
 181         default:
 182                 Con_Print("usage: loadsky skyname\n");
 183                 break;
 184         }
 185 }
 186
 187 static const float skyboxvertex3f[6*4*3] =
 188 {
 189         // skyside[0]
 190          16, -16,  16,
 191          16, -16, -16,
 192          16,  16, -16,
 193          16,  16,  16,
 194         // skyside[1]
 195         -16,  16,  16,
 196         -16,  16, -16,
 197         -16, -16, -16,
 198         -16, -16,  16,
 199         // skyside[2]
 200          16,  16,  16,
 201          16,  16, -16,
 202         -16,  16, -16,
 203         -16,  16,  16,
 204         // skyside[3]
 205         -16, -16,  16,
 206         -16, -16, -16,
 207          16, -16, -16,
 208          16, -16,  16,
 209         // skyside[4]
 210         -16, -16,  16,
 211          16, -16,  16,
 212          16,  16,  16,
 213         -16,  16,  16,
 214         // skyside[5]
 215          16, -16, -16,
 216         -16, -16, -16,
 217         -16,  16, -16,
 218          16,  16, -16
 219 };
 220
 221 static const float skyboxtexcoord2f[6*4*2] =
 222 {
 223         // skyside[0]
 224         0, 1,
 225         1, 1,
 226         1, 0,
 227         0, 0,
 228         // skyside[1]
 229         1, 0,
 230         0, 0,
 231         0, 1,
 232         1, 1,
 233         // skyside[2]
 234         1, 1,
 235         1, 0,
 236         0, 0,
 237         0, 1,
 238         // skyside[3]
 239         0, 0,
 240         0, 1,
 241         1, 1,
 242         1, 0,
 243         // skyside[4]
 244         0, 1,
 245         1, 1,
 246         1, 0,
 247         0, 0,
 248         // skyside[5]
 249         0, 1,
 250         1, 1,
 251         1, 0,
 252         0, 0
 253 };
 254
 255 static const int skyboxelements[6*2*3] =
 256 {
 257         // skyside[3]
 258          0,  1,  2,
 259          0,  2,  3,
 260         // skyside[1]
 261          4,  5,  6,
 262          4,  6,  7,
 263         // skyside[0]
 264          8,  9, 10,
 265          8, 10, 11,
 266         // skyside[2]
 267         12, 13, 14,
 268         12, 14, 15,
 269         // skyside[4]
 270         16, 17, 18,
 271         16, 18, 19,
 272         // skyside[5]
 273         20, 21, 22,
 274         20, 22, 23
 275 };
 276
 277 static void R_SkyBox(void)
 278 {
 279         int i;
 280         // FIXME: fixed function path can't properly handle r_refdef.view.colorscale > 1
 281         GL_Color(1 * r_refdef.view.colorscale, 1 * r_refdef.view.colorscale, 1 * r_refdef.view.colorscale, 1);
 282         GL_BlendFunc(GL_ONE, GL_ZERO);
 283         GL_CullFace(GL_NONE);
 284         GL_DepthMask(false);
 285         GL_DepthRange(0, 1);
 286         GL_PolygonOffset(0, 0);
 287         GL_DepthTest(false); // don't modify or read zbuffer
 288         R_Mesh_VertexPointer(skyboxvertex3f, 0, 0);
 289         R_Mesh_ColorPointer(NULL, 0, 0);
 290         R_Mesh_ResetTextureState();
 291         R_Mesh_TexCoordPointer(0, 2, skyboxtexcoord2f, 0, 0);
 292         R_SetupGenericShader(true);
 293         GL_LockArrays(0, 6*4);
 294         for (i = 0;i < 6;i++)
 295         {
 296                 R_Mesh_TexBind(0, R_GetTexture(skyboxside[i]));
 297                 R_Mesh_Draw(0, 6*4, 2, skyboxelements + i * 6, 0, 0);
 298         }
 299
 300         if(r_refdef.fogenabled)
 301         {
 302                 R_SetupGenericShader(false);
 303                 GL_BlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 304                 GL_Color(r_refdef.fogcolor[0], r_refdef.fogcolor[1], r_refdef.fogcolor[2], 1 - r_refdef.fogmasktable[FOGMASKTABLEWIDTH-1]);
 305                 for (i = 0;i < 6;i++)
 306                 {
 307                         R_Mesh_TexBind(0, 0);
 308                         R_Mesh_Draw(0, 6*4, 2, skyboxelements + i * 6, 0, 0);
 309                 }
 310         }
 311
 312         GL_LockArrays(0, 0);
 313 }
 314
 315 #define skygridx 32
 316 #define skygridx1 (skygridx + 1)
 317 #define skygridxrecip (1.0f / (skygridx))
 318 #define skygridy 32
 319 #define skygridy1 (skygridy + 1)
 320 #define skygridyrecip (1.0f / (skygridy))
 321 #define skysphere_numverts (skygridx1 * skygridy1)
 322 #define skysphere_numtriangles (skygridx * skygridy * 2)
 323 static float skysphere_vertex3f[skysphere_numverts * 3];
 324 static float skysphere_texcoord2f[skysphere_numverts * 2];
 325 static int skysphere_element3i[skysphere_numtriangles * 3];
 326
 327 static void skyspherecalc(void)
 328 {
 329         int i, j, *e;
 330         float a, b, x, ax, ay, v[3], length, *vertex3f, *texcoord2f;
 331         float dx, dy, dz;
 332         dx = 16;
 333         dy = 16;
 334         dz = 16 / 3;
 335         vertex3f = skysphere_vertex3f;
 336         texcoord2f = skysphere_texcoord2f;
 337         for (j = 0;j <= skygridy;j++)
 338         {
 339                 a = j * skygridyrecip;
 340                 ax = cos(a * M_PI * 2);
 341                 ay = -sin(a * M_PI * 2);
 342                 for (i = 0;i <= skygridx;i++)
 343                 {
 344                         b = i * skygridxrecip;
 345                         x = cos((b + 0.5) * M_PI);
 346                         v[0] = ax*x * dx;
 347                         v[1] = ay*x * dy;
 348                         v[2] = -sin((b + 0.5) * M_PI) * dz;
 349                         length = 3.0f / sqrt(v[0]*v[0]+v[1]*v[1]+(v[2]*v[2]*9));
 350                         *texcoord2f++ = v[0] * length;
 351                         *texcoord2f++ = v[1] * length;
 352                         *vertex3f++ = v[0];
 353                         *vertex3f++ = v[1];
 354                         *vertex3f++ = v[2];
 355                 }
 356         }
 357         e = skysphere_element3i;
 358         for (j = 0;j < skygridy;j++)
 359         {
 360                 for (i = 0;i < skygridx;i++)
 361                 {
 362                         *e++ =  j      * skygridx1 + i;
 363                         *e++ =  j      * skygridx1 + i + 1;
 364                         *e++ = (j + 1) * skygridx1 + i;
 365
 366                         *e++ =  j      * skygridx1 + i + 1;
 367                         *e++ = (j + 1) * skygridx1 + i + 1;
 368                         *e++ = (j + 1) * skygridx1 + i;
 369                 }
 370         }
 371 }
 372
 373 static void R_SkySphere(void)
 374 {
 375         float speedscale;
 376         static qboolean skysphereinitialized = false;
 377         matrix4x4_t scroll1matrix, scroll2matrix;
 378         if (!skysphereinitialized)
 379         {
 380                 skysphereinitialized = true;
 381                 skyspherecalc();
 382         }
 383
 384         // wrap the scroll values just to be extra kind to float accuracy
 385
 386         // scroll speed for upper layer
 387         speedscale = r_refdef.scene.time*r_skyscroll1.value*8.0/128.0;
 388         speedscale -= (int)speedscale;
 389         Matrix4x4_CreateTranslate(&scroll1matrix, speedscale, speedscale, 0);
 390         // scroll speed for lower layer (transparent layer)
 391         speedscale = r_refdef.scene.time*r_skyscroll2.value*8.0/128.0;
 392         speedscale -= (int)speedscale;
 393         Matrix4x4_CreateTranslate(&scroll2matrix, speedscale, speedscale, 0);
 394
 395         // FIXME: fixed function path can't properly handle r_refdef.view.colorscale > 1
 396         GL_Color(1 * r_refdef.view.colorscale, 1 * r_refdef.view.colorscale, 1 * r_refdef.view.colorscale, 1);
 397         GL_BlendFunc(GL_ONE, GL_ZERO);
 398         GL_CullFace(GL_NONE);
 399         GL_DepthMask(true);
 400         GL_DepthRange(0, 1);
 401         GL_PolygonOffset(0, 0);
 402         GL_DepthTest(false); // don't modify or read zbuffer
 403         R_Mesh_VertexPointer(skysphere_vertex3f, 0, 0);
 404         R_Mesh_ColorPointer(NULL, 0, 0);
 405         R_Mesh_ResetTextureState();
 406         R_Mesh_TexBind(0, R_GetTexture(r_refdef.scene.worldmodel->brush.solidskytexture));
 407         R_Mesh_TexCoordPointer(0, 2, skysphere_texcoord2f, 0, 0);
 408         R_Mesh_TexMatrix(0, &scroll1matrix);
 409         if (r_textureunits.integer >= 2 && r_refdef.view.colorscale == 1)
 410         {
 411                 // one pass using GL_DECAL or GL_INTERPOLATE_ARB for alpha layer
 412                 R_SetupGenericTwoTextureShader(GL_DECAL);
 413                 R_Mesh_TexBind(1, R_GetTexture(r_refdef.scene.worldmodel->brush.alphaskytexture));
 414                 R_Mesh_TexCoordPointer(1, 2, skysphere_texcoord2f, 0, 0);
 415                 R_Mesh_TexMatrix(1, &scroll2matrix);
 416                 GL_LockArrays(0, skysphere_numverts);
 417                 R_Mesh_Draw(0, skysphere_numverts, skysphere_numtriangles, skysphere_element3i, 0, 0);
 418                 GL_LockArrays(0, 0);
 419                 R_Mesh_TexBind(1, 0);
 420         }
 421         else
 422         {
 423                 // two pass
 424                 R_SetupGenericShader(true);
 425                 GL_LockArrays(0, skysphere_numverts);
 426                 R_Mesh_Draw(0, skysphere_numverts, skysphere_numtriangles, skysphere_element3i, 0, 0);
 427
 428                 GL_BlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 429                 R_Mesh_TexBind(0, R_GetTexture(r_refdef.scene.worldmodel->brush.alphaskytexture));
 430                 R_Mesh_TexMatrix(0, &scroll2matrix);
 431                 GL_LockArrays(0, skysphere_numverts);
 432                 R_Mesh_Draw(0, skysphere_numverts, skysphere_numtriangles, skysphere_element3i, 0, 0);
 433                 GL_LockArrays(0, 0);
 434         }
 435
 436         if(r_refdef.fogenabled)
 437         {
 438                 R_SetupGenericShader(false);
 439                 R_Mesh_TexBind(0, 0);
 440                 GL_BlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 441                 GL_Color(r_refdef.fogcolor[0], r_refdef.fogcolor[1], r_refdef.fogcolor[2], 1 - r_refdef.fogmasktable[FOGMASKTABLEWIDTH-1]);
 442                 GL_LockArrays(0, skysphere_numverts);
 443                 R_Mesh_Draw(0, skysphere_numverts, skysphere_numtriangles, skysphere_element3i, 0, 0);
 444                 GL_LockArrays(0, 0);
 445         }
 446 }
 447
 448 void R_Sky(void)
 449 {
 450         matrix4x4_t skymatrix;
 451         if (skyrendermasked)
 452         {
 453                 Matrix4x4_CreateTranslate(&skymatrix, r_refdef.view.origin[0], r_refdef.view.origin[1], r_refdef.view.origin[2]);
 454                 R_Mesh_Matrix(&skymatrix);
 455                 if (skyrendersphere)
 456                 {
 457                         // this does not modify depth buffer
 458                         R_SkySphere();
 459                 }
 460                 else if (skyrenderbox)
 461                 {
 462                         // this does not modify depth buffer
 463                         R_SkyBox();
 464                 }
 465                 /* this will be skyroom someday
 466                 else
 467                 {
 468                         // this modifies the depth buffer so we have to clear it afterward
 469                         //R_SkyRoom();
 470                         // clear the depthbuffer that was used while rendering the skyroom
 471                         //GL_Clear(GL_DEPTH_BUFFER_BIT);
 472                 }
 473                 */
 474                 GL_DepthRange(0, 1);
 475                 GL_DepthTest(true);
 476                 GL_DepthMask(true);
 477         }
 478 }
 479
 480 //===============================================================
 481
 482 void R_ResetSkyBox(void)
 483 {
 484         R_UnloadSkyBox();
 485         skyname[0] = 0;
 486         R_LoadSkyBox();
 487 }
 488
 489 static void r_sky_start(void)
 490 {
 491         skytexturepool = R_AllocTexturePool();
 492         R_LoadSkyBox();
 493 }
 494
 495 static void r_sky_shutdown(void)
 496 {
 497         R_UnloadSkyBox();
 498         R_FreeTexturePool(&skytexturepool);
 499 }
 500
 501 static void r_sky_newmap(void)
 502 {
 503 }
 504
 505
 506 void R_Sky_Init(void)
 507 {
 508         Cmd_AddCommand ("loadsky", &LoadSky_f, "load a skybox by basename (for example loadsky mtnsun_ loads mtnsun_ft.tga and so on)");
 509         Cvar_RegisterVariable (&r_sky);
 510         Cvar_RegisterVariable (&r_skyscroll1);
 511         Cvar_RegisterVariable (&r_skyscroll2);
 512         memset(&skyboxside, 0, sizeof(skyboxside));
 513         skyname[0] = 0;
 514         R_RegisterModule("R_Sky", r_sky_start, r_sky_shutdown, r_sky_newmap);
 515 }
 516