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 cvar_t r_sky_scissor = {0, "r_sky_scissor", "1", "limit rendering of sky to approximately the area of the sky surfaces"};
  10 int skyrenderlater;
  11 int skyrendermasked;
  12 int skyscissor;
  13 float skyscissormins[3];
  14 float skyscissormaxs[3];
  15
  16 static int skyrendersphere;
  17 static int skyrenderbox;
  18 static rtexturepool_t *skytexturepool;
  19 static char skyname[MAX_QPATH];
  20 static matrix4x4_t skymatrix;
  21 static matrix4x4_t skyinversematrix;
  22
  23 typedef struct suffixinfo_s
  24 {
  25         const char *suffix;
  26         qboolean flipx, flipy, flipdiagonal;
  27 }
  28 suffixinfo_t;
  29 static const suffixinfo_t suffix[3][6] =
  30 {
  31         {
  32                 {"px",   false, false, false},
  33                 {"nx",   false, false, false},
  34                 {"py",   false, false, false},
  35                 {"ny",   false, false, false},
  36                 {"pz",   false, false, false},
  37                 {"nz",   false, false, false}
  38         },
  39         {
  40                 {"posx", false, false, false},
  41                 {"negx", false, false, false},
  42                 {"posy", false, false, false},
  43                 {"negy", false, false, false},
  44                 {"posz", false, false, false},
  45                 {"negz", false, false, false}
  46         },
  47         {
  48                 {"rt",   false, false,  true},
  49                 {"lf",    true,  true,  true},
  50                 {"bk",   false,  true, false},
  51                 {"ft",    true, false, false},
  52                 {"up",   false, false,  true},
  53                 {"dn",   false, false,  true}
  54         }
  55 };
  56
  57 static skinframe_t *skyboxskinframe[6];
  58
  59 void R_SkyStartFrame(void)
  60 {
  61         skyrendersphere = false;
  62         skyrenderbox = false;
  63         skyrendermasked = false;
  64         // for depth-masked sky, we need to know whether any sky was rendered
  65         skyrenderlater = false;
  66         // we can scissor the sky to just the relevant area
  67         skyscissor = false;
  68         VectorClear(skyscissormins);
  69         VectorClear(skyscissormaxs);
  70         if (r_sky.integer)
  71         {
  72                 if (skyboxskinframe[0] || skyboxskinframe[1] || skyboxskinframe[2] || skyboxskinframe[3] || skyboxskinframe[4] || skyboxskinframe[5])
  73                         skyrenderbox = true;
  74                 else if (r_refdef.scene.worldmodel && r_refdef.scene.worldmodel->brush.solidskyskinframe)
  75                         skyrendersphere = true;
  76                 skyrendermasked = true;
  77         }
  78 }
  79
  80 /*
  81 ==================
  82 R_SetSkyBox
  83 ==================
  84 */
  85 static void R_UnloadSkyBox(void)
  86 {
  87         int i;
  88         int c = 0;
  89         for (i = 0;i < 6;i++)
  90         {
  91                 if (skyboxskinframe[i])
  92                 {
  93                         // TODO: make a R_SkinFrame_Purge for single skins...
  94                         c++;
  95                 }
  96                 skyboxskinframe[i] = NULL;
  97         }
  98         if (c && developer_loading.integer)
  99                 Con_Printf("unloading skybox\n");
 100 }
 101
 102 static int R_LoadSkyBox(void)
 103 {
 104         int i, j, success;
 105         int indices[4] = {0,1,2,3};
 106         char name[MAX_INPUTLINE];
 107         unsigned char *image_buffer;
 108         unsigned char *temp;
 109         char vabuf[1024];
 110
 111         R_UnloadSkyBox();
 112
 113         if (!skyname[0])
 114                 return true;
 115
 116         for (j=0; j<3; j++)
 117         {
 118                 success = 0;
 119                 for (i=0; i<6; i++)
 120                 {
 121                         if (dpsnprintf(name, sizeof(name), "%s_%s", skyname, suffix[j][i].suffix) < 0 || !(image_buffer = loadimagepixelsbgra(name, false, false, false, NULL)))
 122                         {
 123                                 if (dpsnprintf(name, sizeof(name), "%s%s", skyname, suffix[j][i].suffix) < 0 || !(image_buffer = loadimagepixelsbgra(name, false, false, false, NULL)))
 124                                 {
 125                                         if (dpsnprintf(name, sizeof(name), "env/%s%s", skyname, suffix[j][i].suffix) < 0 || !(image_buffer = loadimagepixelsbgra(name, false, false, false, NULL)))
 126                                         {
 127                                                 if (dpsnprintf(name, sizeof(name), "gfx/env/%s%s", skyname, suffix[j][i].suffix) < 0 || !(image_buffer = loadimagepixelsbgra(name, false, false, false, NULL)))
 128                                                         continue;
 129                                         }
 130                                 }
 131                         }
 132                         temp = (unsigned char *)Mem_Alloc(tempmempool, image_width*image_height*4);
 133                         Image_CopyMux (temp, image_buffer, image_width, image_height, suffix[j][i].flipx, suffix[j][i].flipy, suffix[j][i].flipdiagonal, 4, 4, indices);
 134                         skyboxskinframe[i] = R_SkinFrame_LoadInternalBGRA(va(vabuf, sizeof(vabuf), "skyboxside%d", i), TEXF_CLAMP | (gl_texturecompression_sky.integer ? TEXF_COMPRESS : 0), temp, image_width, image_height, vid.sRGB3D);
 135                         Mem_Free(image_buffer);
 136                         Mem_Free(temp);
 137                         success++;
 138                 }
 139
 140                 if (success)
 141                         break;
 142         }
 143
 144         if (j == 3)
 145                 return false;
 146
 147         if (developer_loading.integer)
 148                 Con_Printf("loading skybox \"%s\"\n", name);
 149
 150         return true;
 151 }
 152
 153 int R_SetSkyBox(const char *sky)
 154 {
 155         if (strcmp(sky, skyname) == 0) // no change
 156                 return true;
 157
 158         if (strlen(sky) > 1000)
 159         {
 160                 Con_Printf("sky name too long (%i, max is 1000)\n", (int)strlen(sky));
 161                 return false;
 162         }
 163
 164         strlcpy(skyname, sky, sizeof(skyname));
 165
 166         return R_LoadSkyBox();
 167 }
 168
 169 // LordHavoc: added LoadSky console command
 170 static void LoadSky_f (void)
 171 {
 172         switch (Cmd_Argc())
 173         {
 174         case 1:
 175                 if (skyname[0])
 176                         Con_Printf("current sky: %s\n", skyname);
 177                 else
 178                         Con_Print("no skybox has been set\n");
 179                 break;
 180         case 2:
 181                 if (R_SetSkyBox(Cmd_Argv(1)))
 182                 {
 183                         if (skyname[0])
 184                                 Con_Printf("skybox set to %s\n", skyname);
 185                         else
 186                                 Con_Print("skybox disabled\n");
 187                 }
 188                 else
 189                         Con_Printf("failed to load skybox %s\n", Cmd_Argv(1));
 190                 break;
 191         default:
 192                 Con_Print("usage: loadsky skyname\n");
 193                 break;
 194         }
 195 }
 196
 197 static const float skyboxvertex3f[6*4*3] =
 198 {
 199         // skyside[0]
 200          16, -16,  16,
 201          16, -16, -16,
 202          16,  16, -16,
 203          16,  16,  16,
 204         // skyside[1]
 205         -16,  16,  16,
 206         -16,  16, -16,
 207         -16, -16, -16,
 208         -16, -16,  16,
 209         // skyside[2]
 210          16,  16,  16,
 211          16,  16, -16,
 212         -16,  16, -16,
 213         -16,  16,  16,
 214         // skyside[3]
 215         -16, -16,  16,
 216         -16, -16, -16,
 217          16, -16, -16,
 218          16, -16,  16,
 219         // skyside[4]
 220         -16, -16,  16,
 221          16, -16,  16,
 222          16,  16,  16,
 223         -16,  16,  16,
 224         // skyside[5]
 225          16, -16, -16,
 226         -16, -16, -16,
 227         -16,  16, -16,
 228          16,  16, -16
 229 };
 230
 231 static const float skyboxtexcoord2f[6*4*2] =
 232 {
 233         // skyside[0]
 234         0, 1,
 235         1, 1,
 236         1, 0,
 237         0, 0,
 238         // skyside[1]
 239         1, 0,
 240         0, 0,
 241         0, 1,
 242         1, 1,
 243         // skyside[2]
 244         1, 1,
 245         1, 0,
 246         0, 0,
 247         0, 1,
 248         // skyside[3]
 249         0, 0,
 250         0, 1,
 251         1, 1,
 252         1, 0,
 253         // skyside[4]
 254         0, 1,
 255         1, 1,
 256         1, 0,
 257         0, 0,
 258         // skyside[5]
 259         0, 1,
 260         1, 1,
 261         1, 0,
 262         0, 0
 263 };
 264
 265 static const int skyboxelement3i[6*2*3] =
 266 {
 267         // skyside[3]
 268          0,  1,  2,
 269          0,  2,  3,
 270         // skyside[1]
 271          4,  5,  6,
 272          4,  6,  7,
 273         // skyside[0]
 274          8,  9, 10,
 275          8, 10, 11,
 276         // skyside[2]
 277         12, 13, 14,
 278         12, 14, 15,
 279         // skyside[4]
 280         16, 17, 18,
 281         16, 18, 19,
 282         // skyside[5]
 283         20, 21, 22,
 284         20, 22, 23
 285 };
 286
 287 static const unsigned short skyboxelement3s[6*2*3] =
 288 {
 289         // skyside[3]
 290          0,  1,  2,
 291          0,  2,  3,
 292         // skyside[1]
 293          4,  5,  6,
 294          4,  6,  7,
 295         // skyside[0]
 296          8,  9, 10,
 297          8, 10, 11,
 298         // skyside[2]
 299         12, 13, 14,
 300         12, 14, 15,
 301         // skyside[4]
 302         16, 17, 18,
 303         16, 18, 19,
 304         // skyside[5]
 305         20, 21, 22,
 306         20, 22, 23
 307 };
 308
 309 static void R_SkyBox(void)
 310 {
 311         int i;
 312         RSurf_ActiveCustomEntity(&skymatrix, &skyinversematrix, 0, 0, 1, 1, 1, 1, 6*4, skyboxvertex3f, skyboxtexcoord2f, NULL, NULL, NULL, NULL, 6*2, skyboxelement3i, skyboxelement3s, false, false);
 313         for (i = 0;i < 6;i++)
 314                 if(skyboxskinframe[i])
 315                         R_DrawCustomSurface(skyboxskinframe[i], &identitymatrix, MATERIALFLAG_SKY | MATERIALFLAG_FULLBRIGHT | MATERIALFLAG_NOCULLFACE | MATERIALFLAG_NODEPTHTEST, i*4, 4, i*2, 2, false, false);
 316 }
 317
 318 #define skygridx 32
 319 #define skygridx1 (skygridx + 1)
 320 #define skygridxrecip (1.0f / (skygridx))
 321 #define skygridy 32
 322 #define skygridy1 (skygridy + 1)
 323 #define skygridyrecip (1.0f / (skygridy))
 324 #define skysphere_numverts (skygridx1 * skygridy1)
 325 #define skysphere_numtriangles (skygridx * skygridy * 2)
 326 static float skysphere_vertex3f[skysphere_numverts * 3];
 327 static float skysphere_texcoord2f[skysphere_numverts * 2];
 328 static int skysphere_element3i[skysphere_numtriangles * 3];
 329 static unsigned short skysphere_element3s[skysphere_numtriangles * 3];
 330
 331 static void skyspherecalc(void)
 332 {
 333         int i, j;
 334         unsigned short *e;
 335         float a, b, x, ax, ay, v[3], length, *vertex3f, *texcoord2f;
 336         float dx, dy, dz;
 337         dx = 16.0f;
 338         dy = 16.0f;
 339         dz = 16.0f / 3.0f;
 340         vertex3f = skysphere_vertex3f;
 341         texcoord2f = skysphere_texcoord2f;
 342         for (j = 0;j <= skygridy;j++)
 343         {
 344                 a = j * skygridyrecip;
 345                 ax = cos(a * M_PI * 2);
 346                 ay = -sin(a * M_PI * 2);
 347                 for (i = 0;i <= skygridx;i++)
 348                 {
 349                         b = i * skygridxrecip;
 350                         x = cos((b + 0.5) * M_PI);
 351                         v[0] = ax*x * dx;
 352                         v[1] = ay*x * dy;
 353                         v[2] = -sin((b + 0.5) * M_PI) * dz;
 354                         length = 3.0f / sqrt(v[0]*v[0]+v[1]*v[1]+(v[2]*v[2]*9));
 355                         *texcoord2f++ = v[0] * length;
 356                         *texcoord2f++ = v[1] * length;
 357                         *vertex3f++ = v[0];
 358                         *vertex3f++ = v[1];
 359                         *vertex3f++ = v[2];
 360                 }
 361         }
 362         e = skysphere_element3s;
 363         for (j = 0;j < skygridy;j++)
 364         {
 365                 for (i = 0;i < skygridx;i++)
 366                 {
 367                         *e++ =  j      * skygridx1 + i;
 368                         *e++ =  j      * skygridx1 + i + 1;
 369                         *e++ = (j + 1) * skygridx1 + i;
 370
 371                         *e++ =  j      * skygridx1 + i + 1;
 372                         *e++ = (j + 1) * skygridx1 + i + 1;
 373                         *e++ = (j + 1) * skygridx1 + i;
 374                 }
 375         }
 376         for (i = 0;i < skysphere_numtriangles*3;i++)
 377                 skysphere_element3i[i] = skysphere_element3s[i];
 378 }
 379
 380 static void R_SkySphere(void)
 381 {
 382         double speedscale;
 383         static qboolean skysphereinitialized = false;
 384         matrix4x4_t scroll1matrix, scroll2matrix;
 385         if (!skysphereinitialized)
 386         {
 387                 skysphereinitialized = true;
 388                 skyspherecalc();
 389         }
 390
 391         // wrap the scroll values just to be extra kind to float accuracy
 392
 393         // scroll speed for upper layer
 394         speedscale = r_refdef.scene.time*r_skyscroll1.value*8.0/128.0;
 395         speedscale -= floor(speedscale);
 396         Matrix4x4_CreateTranslate(&scroll1matrix, speedscale, speedscale, 0);
 397         // scroll speed for lower layer (transparent layer)
 398         speedscale = r_refdef.scene.time*r_skyscroll2.value*8.0/128.0;
 399         speedscale -= floor(speedscale);
 400         Matrix4x4_CreateTranslate(&scroll2matrix, speedscale, speedscale, 0);
 401
 402         RSurf_ActiveCustomEntity(&skymatrix, &skyinversematrix, 0, 0, 1, 1, 1, 1, skysphere_numverts, skysphere_vertex3f, skysphere_texcoord2f, NULL, NULL, NULL, NULL, skysphere_numtriangles, skysphere_element3i, skysphere_element3s, false, false);
 403         R_DrawCustomSurface(r_refdef.scene.worldmodel->brush.solidskyskinframe, &scroll1matrix, MATERIALFLAG_SKY | MATERIALFLAG_FULLBRIGHT | MATERIALFLAG_NOCULLFACE | MATERIALFLAG_NODEPTHTEST                                            , 0, skysphere_numverts, 0, skysphere_numtriangles, false, false);
 404         R_DrawCustomSurface(r_refdef.scene.worldmodel->brush.alphaskyskinframe, &scroll2matrix, MATERIALFLAG_SKY | MATERIALFLAG_FULLBRIGHT | MATERIALFLAG_NOCULLFACE | MATERIALFLAG_NODEPTHTEST | MATERIALFLAG_ALPHA | MATERIALFLAG_BLENDED, 0, skysphere_numverts, 0, skysphere_numtriangles, false, false);
 405 }
 406
 407 void R_Sky(void)
 408 {
 409         int scissor[4];
 410         Matrix4x4_CreateFromQuakeEntity(&skymatrix, r_refdef.view.origin[0], r_refdef.view.origin[1], r_refdef.view.origin[2], 0, 0, 0, r_refdef.farclip * (0.5f / 16.0f));
 411         Matrix4x4_Invert_Simple(&skyinversematrix, &skymatrix);
 412
 413         if (r_sky_scissor.integer && skyscissor)
 414         {
 415                 // compute the scissor, if it's offscreen just return
 416                 if (R_ScissorForBBox(skyscissormins, skyscissormaxs, scissor))
 417                         return;
 418                 GL_Scissor(scissor[0], scissor[1], scissor[2], scissor[3]);
 419                 GL_ScissorTest(true);
 420         }
 421         if (skyrendersphere)
 422         {
 423                 // this does not modify depth buffer
 424                 R_SkySphere();
 425         }
 426         else if (skyrenderbox)
 427         {
 428                 // this does not modify depth buffer
 429                 R_SkyBox();
 430         }
 431         /* this will be skyroom someday
 432         else
 433         {
 434                 // this modifies the depth buffer so we have to clear it afterward
 435                 //R_SkyRoom();
 436                 // clear the depthbuffer that was used while rendering the skyroom
 437                 //GL_Clear(GL_DEPTH_BUFFER_BIT);
 438         }
 439         */
 440         GL_Scissor(0, 0, vid.width, vid.height);
 441 }
 442
 443 //===============================================================
 444
 445 void R_ResetSkyBox(void)
 446 {
 447         R_UnloadSkyBox();
 448         skyname[0] = 0;
 449         R_LoadSkyBox();
 450 }
 451
 452 static void r_sky_start(void)
 453 {
 454         skytexturepool = R_AllocTexturePool();
 455         R_LoadSkyBox();
 456 }
 457
 458 static void r_sky_shutdown(void)
 459 {
 460         R_UnloadSkyBox();
 461         R_FreeTexturePool(&skytexturepool);
 462 }
 463
 464 static void r_sky_newmap(void)
 465 {
 466 }
 467
 468
 469 void R_Sky_Init(void)
 470 {
 471         Cmd_AddCommand ("loadsky", &LoadSky_f, "load a skybox by basename (for example loadsky mtnsun_ loads mtnsun_ft.tga and so on)");
 472         Cvar_RegisterVariable (&r_sky);
 473         Cvar_RegisterVariable (&r_skyscroll1);
 474         Cvar_RegisterVariable (&r_skyscroll2);
 475         Cvar_RegisterVariable (&r_sky_scissor);
 476         memset(&skyboxskinframe, 0, sizeof(skyboxskinframe));
 477         skyname[0] = 0;
 478         R_RegisterModule("R_Sky", r_sky_start, r_sky_shutdown, r_sky_newmap, NULL, NULL);
 479 }
 480