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_CLIENT | CVAR_SAVE, "r_sky", "1", "enables sky rendering (black otherwise)"};
   7 cvar_t r_skyscroll1 = {CVAR_CLIENT | CVAR_SAVE, "r_skyscroll1", "1", "speed at which upper clouds layer scrolls in quake sky"};
   8 cvar_t r_skyscroll2 = {CVAR_CLIENT | CVAR_SAVE, "r_skyscroll2", "2", "speed at which lower clouds layer scrolls in quake sky"};
   9 cvar_t r_sky_scissor = {CVAR_CLIENT, "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[4];
  13
  14 static int skyrendersphere;
  15 static int skyrenderbox;
  16 static rtexturepool_t *skytexturepool;
  17 static char skyname[MAX_QPATH];
  18 static matrix4x4_t skymatrix;
  19 static matrix4x4_t skyinversematrix;
  20
  21 typedef struct suffixinfo_s
  22 {
  23         const char *suffix;
  24         qboolean flipx, flipy, flipdiagonal;
  25 }
  26 suffixinfo_t;
  27 static const suffixinfo_t suffix[3][6] =
  28 {
  29         {
  30                 {"px",   false, false, false},
  31                 {"nx",   false, false, false},
  32                 {"py",   false, false, false},
  33                 {"ny",   false, false, false},
  34                 {"pz",   false, false, false},
  35                 {"nz",   false, false, false}
  36         },
  37         {
  38                 {"posx", false, false, false},
  39                 {"negx", false, false, false},
  40                 {"posy", false, false, false},
  41                 {"negy", false, false, false},
  42                 {"posz", false, false, false},
  43                 {"negz", false, false, false}
  44         },
  45         {
  46                 {"rt",   false, false,  true},
  47                 {"lf",    true,  true,  true},
  48                 {"bk",   false,  true, false},
  49                 {"ft",    true, false, false},
  50                 {"up",   false, false,  true},
  51                 {"dn",   false, false,  true}
  52         }
  53 };
  54
  55 static skinframe_t *skyboxskinframe[6];
  56
  57 void R_SkyStartFrame(void)
  58 {
  59         skyrendersphere = false;
  60         skyrenderbox = false;
  61         skyrendermasked = false;
  62         // for depth-masked sky, we need to know whether any sky was rendered
  63         skyrenderlater = false;
  64         // we can scissor the sky to just the relevant area
  65         Vector4Clear(skyscissor);
  66         if (r_sky.integer)
  67         {
  68                 if (skyboxskinframe[0] || skyboxskinframe[1] || skyboxskinframe[2] || skyboxskinframe[3] || skyboxskinframe[4] || skyboxskinframe[5])
  69                         skyrenderbox = true;
  70                 else if (r_refdef.scene.worldmodel && r_refdef.scene.worldmodel->brush.solidskyskinframe)
  71                         skyrendersphere = true;
  72                 skyrendermasked = true;
  73         }
  74 }
  75
  76 /*
  77 ==================
  78 R_SetSkyBox
  79 ==================
  80 */
  81 static void R_UnloadSkyBox(void)
  82 {
  83         int i;
  84         int c = 0;
  85         for (i = 0;i < 6;i++)
  86         {
  87                 if (skyboxskinframe[i])
  88                 {
  89                         R_SkinFrame_PurgeSkinFrame(skyboxskinframe[i]);
  90                         c++;
  91                 }
  92                 skyboxskinframe[i] = NULL;
  93         }
  94         if (c && developer_loading.integer)
  95                 Con_Printf("unloading skybox\n");
  96 }
  97
  98 static int R_LoadSkyBox(void)
  99 {
 100         int i, j, success;
 101         int indices[4] = {0,1,2,3};
 102         char name[MAX_INPUTLINE];
 103         unsigned char *image_buffer;
 104         unsigned char *temp;
 105         char vabuf[1024];
 106
 107         R_UnloadSkyBox();
 108
 109         if (!skyname[0])
 110                 return true;
 111
 112         for (j=0; j<3; j++)
 113         {
 114                 success = 0;
 115                 for (i=0; i<6; i++)
 116                 {
 117                         if (dpsnprintf(name, sizeof(name), "%s_%s", skyname, suffix[j][i].suffix) < 0 || !(image_buffer = loadimagepixelsbgra(name, false, false, false, NULL)))
 118                         {
 119                                 if (dpsnprintf(name, sizeof(name), "%s%s", skyname, suffix[j][i].suffix) < 0 || !(image_buffer = loadimagepixelsbgra(name, false, false, false, NULL)))
 120                                 {
 121                                         if (dpsnprintf(name, sizeof(name), "env/%s%s", skyname, suffix[j][i].suffix) < 0 || !(image_buffer = loadimagepixelsbgra(name, false, false, false, NULL)))
 122                                         {
 123                                                 if (dpsnprintf(name, sizeof(name), "gfx/env/%s%s", skyname, suffix[j][i].suffix) < 0 || !(image_buffer = loadimagepixelsbgra(name, false, false, false, NULL)))
 124                                                         continue;
 125                                         }
 126                                 }
 127                         }
 128                         temp = (unsigned char *)Mem_Alloc(tempmempool, image_width*image_height*4);
 129                         Image_CopyMux (temp, image_buffer, image_width, image_height, suffix[j][i].flipx, suffix[j][i].flipy, suffix[j][i].flipdiagonal, 4, 4, indices);
 130                         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, 0, 0, 0, vid.sRGB3D);
 131                         Mem_Free(image_buffer);
 132                         Mem_Free(temp);
 133                         success++;
 134                 }
 135
 136                 if (success)
 137                         break;
 138         }
 139
 140         if (j == 3)
 141                 return false;
 142
 143         if (developer_loading.integer)
 144                 Con_Printf("loading skybox \"%s\"\n", name);
 145
 146         return true;
 147 }
 148
 149 int R_SetSkyBox(const char *sky)
 150 {
 151         if (strcmp(sky, skyname) == 0) // no change
 152                 return true;
 153
 154         if (strlen(sky) > 1000)
 155         {
 156                 Con_Printf("sky name too long (%i, max is 1000)\n", (int)strlen(sky));
 157                 return false;
 158         }
 159
 160         strlcpy(skyname, sky, sizeof(skyname));
 161
 162         return R_LoadSkyBox();
 163 }
 164
 165 // LadyHavoc: added LoadSky console command
 166 static void LoadSky_f(cmd_state_t *cmd)
 167 {
 168         switch (Cmd_Argc(cmd))
 169         {
 170         case 1:
 171                 if (skyname[0])
 172                         Con_Printf("current sky: %s\n", skyname);
 173                 else
 174                         Con_Print("no skybox has been set\n");
 175                 break;
 176         case 2:
 177                 if (R_SetSkyBox(Cmd_Argv(cmd, 1)))
 178                 {
 179                         if (skyname[0])
 180                                 Con_Printf("skybox set to %s\n", skyname);
 181                         else
 182                                 Con_Print("skybox disabled\n");
 183                 }
 184                 else
 185                         Con_Errorf("failed to load skybox %s\n", Cmd_Argv(cmd, 1));
 186                 break;
 187         default:
 188                 Con_Print("usage: loadsky skyname\n");
 189                 break;
 190         }
 191 }
 192
 193 static const float skyboxvertex3f[6*4*3] =
 194 {
 195         // skyside[0]
 196          16, -16,  16,
 197          16, -16, -16,
 198          16,  16, -16,
 199          16,  16,  16,
 200         // skyside[1]
 201         -16,  16,  16,
 202         -16,  16, -16,
 203         -16, -16, -16,
 204         -16, -16,  16,
 205         // skyside[2]
 206          16,  16,  16,
 207          16,  16, -16,
 208         -16,  16, -16,
 209         -16,  16,  16,
 210         // skyside[3]
 211         -16, -16,  16,
 212         -16, -16, -16,
 213          16, -16, -16,
 214          16, -16,  16,
 215         // skyside[4]
 216         -16, -16,  16,
 217          16, -16,  16,
 218          16,  16,  16,
 219         -16,  16,  16,
 220         // skyside[5]
 221          16, -16, -16,
 222         -16, -16, -16,
 223         -16,  16, -16,
 224          16,  16, -16
 225 };
 226
 227 static const float skyboxtexcoord2f[6*4*2] =
 228 {
 229         // skyside[0]
 230         0, 1,
 231         1, 1,
 232         1, 0,
 233         0, 0,
 234         // skyside[1]
 235         1, 0,
 236         0, 0,
 237         0, 1,
 238         1, 1,
 239         // skyside[2]
 240         1, 1,
 241         1, 0,
 242         0, 0,
 243         0, 1,
 244         // skyside[3]
 245         0, 0,
 246         0, 1,
 247         1, 1,
 248         1, 0,
 249         // skyside[4]
 250         0, 1,
 251         1, 1,
 252         1, 0,
 253         0, 0,
 254         // skyside[5]
 255         0, 1,
 256         1, 1,
 257         1, 0,
 258         0, 0
 259 };
 260
 261 static const int skyboxelement3i[6*2*3] =
 262 {
 263         // skyside[3]
 264          0,  1,  2,
 265          0,  2,  3,
 266         // skyside[1]
 267          4,  5,  6,
 268          4,  6,  7,
 269         // skyside[0]
 270          8,  9, 10,
 271          8, 10, 11,
 272         // skyside[2]
 273         12, 13, 14,
 274         12, 14, 15,
 275         // skyside[4]
 276         16, 17, 18,
 277         16, 18, 19,
 278         // skyside[5]
 279         20, 21, 22,
 280         20, 22, 23
 281 };
 282
 283 static const unsigned short skyboxelement3s[6*2*3] =
 284 {
 285         // skyside[3]
 286          0,  1,  2,
 287          0,  2,  3,
 288         // skyside[1]
 289          4,  5,  6,
 290          4,  6,  7,
 291         // skyside[0]
 292          8,  9, 10,
 293          8, 10, 11,
 294         // skyside[2]
 295         12, 13, 14,
 296         12, 14, 15,
 297         // skyside[4]
 298         16, 17, 18,
 299         16, 18, 19,
 300         // skyside[5]
 301         20, 21, 22,
 302         20, 22, 23
 303 };
 304
 305 static void R_SkyBox(void)
 306 {
 307         int i;
 308         RSurf_ActiveCustomEntity(&skymatrix, &skyinversematrix, 0, 0, 1, 1, 1, 1, 6*4, skyboxvertex3f, skyboxtexcoord2f, NULL, NULL, NULL, NULL, 6*2, skyboxelement3i, skyboxelement3s, false, false);
 309         for (i = 0;i < 6;i++)
 310                 if(skyboxskinframe[i])
 311                         R_DrawCustomSurface(skyboxskinframe[i], &identitymatrix, MATERIALFLAG_SKY | MATERIALFLAG_FULLBRIGHT | MATERIALFLAG_NOCULLFACE | MATERIALFLAG_NODEPTHTEST, i*4, 4, i*2, 2, false, false, false);
 312 }
 313
 314 #define skygridx 32
 315 #define skygridx1 (skygridx + 1)
 316 #define skygridxrecip (1.0f / (skygridx))
 317 #define skygridy 32
 318 #define skygridy1 (skygridy + 1)
 319 #define skygridyrecip (1.0f / (skygridy))
 320 #define skysphere_numverts (skygridx1 * skygridy1)
 321 #define skysphere_numtriangles (skygridx * skygridy * 2)
 322 static float skysphere_vertex3f[skysphere_numverts * 3];
 323 static float skysphere_texcoord2f[skysphere_numverts * 2];
 324 static int skysphere_element3i[skysphere_numtriangles * 3];
 325 static unsigned short skysphere_element3s[skysphere_numtriangles * 3];
 326
 327 static void skyspherecalc(void)
 328 {
 329         int i, j;
 330         unsigned short *e;
 331         float a, b, x, ax, ay, v[3], length, *vertex3f, *texcoord2f;
 332         float dx, dy, dz;
 333         dx = 16.0f;
 334         dy = 16.0f;
 335         dz = 16.0f / 3.0f;
 336         vertex3f = skysphere_vertex3f;
 337         texcoord2f = skysphere_texcoord2f;
 338         for (j = 0;j <= skygridy;j++)
 339         {
 340                 a = j * skygridyrecip;
 341                 ax = cos(a * M_PI * 2);
 342                 ay = -sin(a * M_PI * 2);
 343                 for (i = 0;i <= skygridx;i++)
 344                 {
 345                         b = i * skygridxrecip;
 346                         x = cos((b + 0.5) * M_PI);
 347                         v[0] = ax*x * dx;
 348                         v[1] = ay*x * dy;
 349                         v[2] = -sin((b + 0.5) * M_PI) * dz;
 350                         length = 3.0f / sqrt(v[0]*v[0]+v[1]*v[1]+(v[2]*v[2]*9));
 351                         *texcoord2f++ = v[0] * length;
 352                         *texcoord2f++ = v[1] * length;
 353                         *vertex3f++ = v[0];
 354                         *vertex3f++ = v[1];
 355                         *vertex3f++ = v[2];
 356                 }
 357         }
 358         e = skysphere_element3s;
 359         for (j = 0;j < skygridy;j++)
 360         {
 361                 for (i = 0;i < skygridx;i++)
 362                 {
 363                         *e++ =  j      * skygridx1 + i;
 364                         *e++ =  j      * skygridx1 + i + 1;
 365                         *e++ = (j + 1) * skygridx1 + i;
 366
 367                         *e++ =  j      * skygridx1 + i + 1;
 368                         *e++ = (j + 1) * skygridx1 + i + 1;
 369                         *e++ = (j + 1) * skygridx1 + i;
 370                 }
 371         }
 372         for (i = 0;i < skysphere_numtriangles*3;i++)
 373                 skysphere_element3i[i] = skysphere_element3s[i];
 374 }
 375
 376 static void R_SkySphere(void)
 377 {
 378         double speedscale;
 379         static qboolean skysphereinitialized = false;
 380         matrix4x4_t scroll1matrix, scroll2matrix;
 381         if (!skysphereinitialized)
 382         {
 383                 skysphereinitialized = true;
 384                 skyspherecalc();
 385         }
 386
 387         // wrap the scroll values just to be extra kind to float accuracy
 388
 389         // scroll speed for upper layer
 390         speedscale = r_refdef.scene.time*r_skyscroll1.value*8.0/128.0;
 391         speedscale -= floor(speedscale);
 392         Matrix4x4_CreateTranslate(&scroll1matrix, speedscale, speedscale, 0);
 393         // scroll speed for lower layer (transparent layer)
 394         speedscale = r_refdef.scene.time*r_skyscroll2.value*8.0/128.0;
 395         speedscale -= floor(speedscale);
 396         Matrix4x4_CreateTranslate(&scroll2matrix, speedscale, speedscale, 0);
 397
 398         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);
 399         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, false);
 400         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, false);
 401 }
 402
 403 void R_Sky(void)
 404 {
 405         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));
 406         Matrix4x4_Invert_Simple(&skyinversematrix, &skymatrix);
 407
 408         if (r_sky_scissor.integer)
 409         {
 410                 // if the scissor is empty just return
 411                 if (skyscissor[2] == 0 || skyscissor[3] == 0)
 412                         return;
 413                 GL_Scissor(skyscissor[0], skyscissor[1], skyscissor[2], skyscissor[3]);
 414                 GL_ScissorTest(true);
 415         }
 416         if (skyrendersphere)
 417         {
 418                 // this does not modify depth buffer
 419                 R_SkySphere();
 420         }
 421         else if (skyrenderbox)
 422         {
 423                 // this does not modify depth buffer
 424                 R_SkyBox();
 425         }
 426         /* this will be skyroom someday
 427         else
 428         {
 429                 // this modifies the depth buffer so we have to clear it afterward
 430                 //R_SkyRoom();
 431                 // clear the depthbuffer that was used while rendering the skyroom
 432                 //GL_Clear(GL_DEPTH_BUFFER_BIT);
 433         }
 434         */
 435         GL_Scissor(0, 0, r_fb.screentexturewidth, r_fb.screentextureheight);
 436 }
 437
 438 //===============================================================
 439
 440 void R_ResetSkyBox(void)
 441 {
 442         R_UnloadSkyBox();
 443         memset(skyname,0,MAX_QPATH);
 444         R_LoadSkyBox();
 445 }
 446
 447 static void r_sky_start(void)
 448 {
 449         skytexturepool = R_AllocTexturePool();
 450         R_LoadSkyBox();
 451 }
 452
 453 static void r_sky_shutdown(void)
 454 {
 455         R_UnloadSkyBox();
 456         R_FreeTexturePool(&skytexturepool);
 457 }
 458
 459 static void r_sky_newmap(void)
 460 {
 461 }
 462
 463
 464 void R_Sky_Init(void)
 465 {
 466         Cmd_AddCommand(CMD_CLIENT, "loadsky", &LoadSky_f, "load a skybox by basename (for example loadsky mtnsun_ loads mtnsun_ft.tga and so on)");
 467         Cvar_RegisterVariable (&r_sky);
 468         Cvar_RegisterVariable (&r_skyscroll1);
 469         Cvar_RegisterVariable (&r_skyscroll2);
 470         Cvar_RegisterVariable (&r_sky_scissor);
 471         memset(&skyboxskinframe, 0, sizeof(skyboxskinframe));
 472         skyname[0] = 0;
 473         R_RegisterModule("R_Sky", r_sky_start, r_sky_shutdown, r_sky_newmap, NULL, NULL);
 474 }
 475