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 skyrenderlater;
  10 int skyrendermasked;
  11
  12 static int skyrendersphere;
  13 static int skyrenderbox;
  14 static rtexturepool_t *skytexturepool;
  15 static char skyname[MAX_QPATH];
  16 static matrix4x4_t skymatrix;
  17 static matrix4x4_t skyinversematrix;
  18
  19 typedef struct suffixinfo_s
  20 {
  21         const char *suffix;
  22         qboolean flipx, flipy, flipdiagonal;
  23 }
  24 suffixinfo_t;
  25 static const suffixinfo_t suffix[3][6] =
  26 {
  27         {
  28                 {"px",   false, false, false},
  29                 {"nx",   false, false, false},
  30                 {"py",   false, false, false},
  31                 {"ny",   false, false, false},
  32                 {"pz",   false, false, false},
  33                 {"nz",   false, false, false}
  34         },
  35         {
  36                 {"posx", false, false, false},
  37                 {"negx", false, false, false},
  38                 {"posy", false, false, false},
  39                 {"negy", false, false, false},
  40                 {"posz", false, false, false},
  41                 {"negz", false, false, false}
  42         },
  43         {
  44                 {"rt",   false, false,  true},
  45                 {"lf",    true,  true,  true},
  46                 {"bk",   false,  true, false},
  47                 {"ft",    true, false, false},
  48                 {"up",   false, false,  true},
  49                 {"dn",   false, false,  true}
  50         }
  51 };
  52
  53 static rtexture_t *skyboxside[6];
  54
  55 void R_SkyStartFrame(void)
  56 {
  57         skyrendersphere = false;
  58         skyrenderbox = false;
  59         skyrendermasked = false;
  60         // for depth-masked sky, we need to know whether any sky was rendered
  61         skyrenderlater = false;
  62         if (r_sky.integer && !(r_refdef.fogenabled && r_refdef.fogmasktable[FOGMASKTABLEWIDTH-1] < (1.0f / 256.0f)))
  63         {
  64                 if (skyboxside[0] || skyboxside[1] || skyboxside[2] || skyboxside[3] || skyboxside[4] || skyboxside[5])
  65                         skyrenderbox = true;
  66                 else if (r_refdef.scene.worldmodel && r_refdef.scene.worldmodel->brush.solidskytexture)
  67                         skyrendersphere = true;
  68                 skyrendermasked = true;
  69         }
  70 }
  71
  72 /*
  73 ==================
  74 R_SetSkyBox
  75 ==================
  76 */
  77 void R_UnloadSkyBox(void)
  78 {
  79         int i;
  80         int c = 0;
  81         for (i = 0;i < 6;i++)
  82         {
  83                 if (skyboxside[i])
  84                 {
  85                         R_FreeTexture(skyboxside[i]);
  86                         c++;
  87                 }
  88                 skyboxside[i] = NULL;
  89         }
  90         if (c && developer_loading.integer)
  91                 Con_Printf("unloading skybox\n");
  92 }
  93
  94 int R_LoadSkyBox(void)
  95 {
  96         int i, j, success;
  97         int indices[4] = {0,1,2,3};
  98         char name[MAX_INPUTLINE];
  99         unsigned char *image_buffer;
 100         unsigned char *temp;
 101
 102         R_UnloadSkyBox();
 103
 104         if (!skyname[0])
 105                 return true;
 106
 107         for (j=0; j<3; j++)
 108         {
 109                 success = 0;
 110                 for (i=0; i<6; i++)
 111                 {
 112                         if (dpsnprintf(name, sizeof(name), "%s_%s", skyname, suffix[j][i].suffix) < 0 || !(image_buffer = loadimagepixelsbgra(name, false, false)))
 113                         {
 114                                 if (dpsnprintf(name, sizeof(name), "%s%s", skyname, suffix[j][i].suffix) < 0 || !(image_buffer = loadimagepixelsbgra(name, false, false)))
 115                                 {
 116                                         if (dpsnprintf(name, sizeof(name), "env/%s%s", skyname, suffix[j][i].suffix) < 0 || !(image_buffer = loadimagepixelsbgra(name, false, false)))
 117                                         {
 118                                                 if (dpsnprintf(name, sizeof(name), "gfx/env/%s%s", skyname, suffix[j][i].suffix) < 0 || !(image_buffer = loadimagepixelsbgra(name, false, false)))
 119                                                         continue;
 120                                         }
 121                                 }
 122                         }
 123                         temp = (unsigned char *)Mem_Alloc(tempmempool, image_width*image_height*4);
 124                         Image_CopyMux (temp, image_buffer, image_width, image_height, suffix[j][i].flipx, suffix[j][i].flipy, suffix[j][i].flipdiagonal, 4, 4, indices);
 125                         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);
 126                         Mem_Free(image_buffer);
 127                         Mem_Free(temp);
 128                         success++;
 129                 }
 130
 131                 if (success)
 132                         break;
 133         }
 134
 135         if (j == 3)
 136                 return false;
 137
 138         if (developer_loading.integer)
 139                 Con_Printf("loading skybox \"%s\"\n", name);
 140
 141         return true;
 142 }
 143
 144 int R_SetSkyBox(const char *sky)
 145 {
 146         if (strcmp(sky, skyname) == 0) // no change
 147                 return true;
 148
 149         if (strlen(sky) > 1000)
 150         {
 151                 Con_Printf("sky name too long (%i, max is 1000)\n", (int)strlen(sky));
 152                 return false;
 153         }
 154
 155         strlcpy(skyname, sky, sizeof(skyname));
 156
 157         return R_LoadSkyBox();
 158 }
 159
 160 // LordHavoc: added LoadSky console command
 161 void LoadSky_f (void)
 162 {
 163         switch (Cmd_Argc())
 164         {
 165         case 1:
 166                 if (skyname[0])
 167                         Con_Printf("current sky: %s\n", skyname);
 168                 else
 169                         Con_Print("no skybox has been set\n");
 170                 break;
 171         case 2:
 172                 if (R_SetSkyBox(Cmd_Argv(1)))
 173                 {
 174                         if (skyname[0])
 175                                 Con_Printf("skybox set to %s\n", skyname);
 176                         else
 177                                 Con_Print("skybox disabled\n");
 178                 }
 179                 else
 180                         Con_Printf("failed to load skybox %s\n", Cmd_Argv(1));
 181                 break;
 182         default:
 183                 Con_Print("usage: loadsky skyname\n");
 184                 break;
 185         }
 186 }
 187
 188 static const float skyboxvertex3f[6*4*3] =
 189 {
 190         // skyside[0]
 191          16, -16,  16,
 192          16, -16, -16,
 193          16,  16, -16,
 194          16,  16,  16,
 195         // skyside[1]
 196         -16,  16,  16,
 197         -16,  16, -16,
 198         -16, -16, -16,
 199         -16, -16,  16,
 200         // skyside[2]
 201          16,  16,  16,
 202          16,  16, -16,
 203         -16,  16, -16,
 204         -16,  16,  16,
 205         // skyside[3]
 206         -16, -16,  16,
 207         -16, -16, -16,
 208          16, -16, -16,
 209          16, -16,  16,
 210         // skyside[4]
 211         -16, -16,  16,
 212          16, -16,  16,
 213          16,  16,  16,
 214         -16,  16,  16,
 215         // skyside[5]
 216          16, -16, -16,
 217         -16, -16, -16,
 218         -16,  16, -16,
 219          16,  16, -16
 220 };
 221
 222 static const float skyboxtexcoord2f[6*4*2] =
 223 {
 224         // skyside[0]
 225         0, 1,
 226         1, 1,
 227         1, 0,
 228         0, 0,
 229         // skyside[1]
 230         1, 0,
 231         0, 0,
 232         0, 1,
 233         1, 1,
 234         // skyside[2]
 235         1, 1,
 236         1, 0,
 237         0, 0,
 238         0, 1,
 239         // skyside[3]
 240         0, 0,
 241         0, 1,
 242         1, 1,
 243         1, 0,
 244         // skyside[4]
 245         0, 1,
 246         1, 1,
 247         1, 0,
 248         0, 0,
 249         // skyside[5]
 250         0, 1,
 251         1, 1,
 252         1, 0,
 253         0, 0
 254 };
 255
 256 static const unsigned short skyboxelements[6*2*3] =
 257 {
 258         // skyside[3]
 259          0,  1,  2,
 260          0,  2,  3,
 261         // skyside[1]
 262          4,  5,  6,
 263          4,  6,  7,
 264         // skyside[0]
 265          8,  9, 10,
 266          8, 10, 11,
 267         // skyside[2]
 268         12, 13, 14,
 269         12, 14, 15,
 270         // skyside[4]
 271         16, 17, 18,
 272         16, 18, 19,
 273         // skyside[5]
 274         20, 21, 22,
 275         20, 22, 23
 276 };
 277
 278 static void R_SkyBox(void)
 279 {
 280         int i;
 281         // FIXME: fixed function path can't properly handle r_refdef.view.colorscale > 1
 282         GL_Color(1 * r_refdef.view.colorscale, 1 * r_refdef.view.colorscale, 1 * r_refdef.view.colorscale, 1);
 283         GL_BlendFunc(GL_ONE, GL_ZERO);
 284         GL_CullFace(GL_NONE);
 285         GL_DepthMask(false);
 286         GL_DepthRange(0, 1);
 287         GL_PolygonOffset(0, 0);
 288         GL_DepthTest(false); // don't modify or read zbuffer
 289         R_Mesh_VertexPointer(skyboxvertex3f, 0, 0);
 290         R_Mesh_ColorPointer(NULL, 0, 0);
 291         R_Mesh_ResetTextureState();
 292         R_Mesh_TexCoordPointer(0, 2, skyboxtexcoord2f, 0, 0);
 293         R_SetupGenericShader(true);
 294         GL_LockArrays(0, 6*4);
 295         for (i = 0;i < 6;i++)
 296         {
 297                 R_Mesh_TexBind(0, R_GetTexture(skyboxside[i]));
 298                 R_Mesh_Draw(0, 6*4, i*2, 2, NULL, skyboxelements, 0, 0);
 299         }
 300
 301         if(r_refdef.fogenabled)
 302         {
 303                 R_SetupGenericShader(false);
 304                 GL_BlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 305                 GL_Color(r_refdef.fogcolor[0], r_refdef.fogcolor[1], r_refdef.fogcolor[2], 1 - r_refdef.fogmasktable[FOGMASKTABLEWIDTH-1]);
 306                 for (i = 0;i < 6;i++)
 307                 {
 308                         R_Mesh_TexBind(0, 0);
 309                         R_Mesh_Draw(0, 6*4, i*2, 2, NULL, skyboxelements, 0, 0);
 310                 }
 311         }
 312
 313         GL_LockArrays(0, 0);
 314 }
 315
 316 #define skygridx 32
 317 #define skygridx1 (skygridx + 1)
 318 #define skygridxrecip (1.0f / (skygridx))
 319 #define skygridy 32
 320 #define skygridy1 (skygridy + 1)
 321 #define skygridyrecip (1.0f / (skygridy))
 322 #define skysphere_numverts (skygridx1 * skygridy1)
 323 #define skysphere_numtriangles (skygridx * skygridy * 2)
 324 static float skysphere_vertex3f[skysphere_numverts * 3];
 325 static float skysphere_texcoord2f[skysphere_numverts * 2];
 326 static unsigned short skysphere_elements[skysphere_numtriangles * 3];
 327
 328 static void skyspherecalc(void)
 329 {
 330         int i, j;
 331         unsigned short *e;
 332         float a, b, x, ax, ay, v[3], length, *vertex3f, *texcoord2f;
 333         float dx, dy, dz;
 334         dx = 16.0f;
 335         dy = 16.0f;
 336         dz = 16.0f / 3.0f;
 337         vertex3f = skysphere_vertex3f;
 338         texcoord2f = skysphere_texcoord2f;
 339         for (j = 0;j <= skygridy;j++)
 340         {
 341                 a = j * skygridyrecip;
 342                 ax = cos(a * M_PI * 2);
 343                 ay = -sin(a * M_PI * 2);
 344                 for (i = 0;i <= skygridx;i++)
 345                 {
 346                         b = i * skygridxrecip;
 347                         x = cos((b + 0.5) * M_PI);
 348                         v[0] = ax*x * dx;
 349                         v[1] = ay*x * dy;
 350                         v[2] = -sin((b + 0.5) * M_PI) * dz;
 351                         length = 3.0f / sqrt(v[0]*v[0]+v[1]*v[1]+(v[2]*v[2]*9));
 352                         *texcoord2f++ = v[0] * length;
 353                         *texcoord2f++ = v[1] * length;
 354                         *vertex3f++ = v[0];
 355                         *vertex3f++ = v[1];
 356                         *vertex3f++ = v[2];
 357                 }
 358         }
 359         e = skysphere_elements;
 360         for (j = 0;j < skygridy;j++)
 361         {
 362                 for (i = 0;i < skygridx;i++)
 363                 {
 364                         *e++ =  j      * skygridx1 + i;
 365                         *e++ =  j      * skygridx1 + i + 1;
 366                         *e++ = (j + 1) * skygridx1 + i;
 367
 368                         *e++ =  j      * skygridx1 + i + 1;
 369                         *e++ = (j + 1) * skygridx1 + i + 1;
 370                         *e++ = (j + 1) * skygridx1 + i;
 371                 }
 372         }
 373 }
 374
 375 static void R_SkySphere(void)
 376 {
 377         double speedscale;
 378         static qboolean skysphereinitialized = false;
 379         matrix4x4_t scroll1matrix, scroll2matrix;
 380         if (!skysphereinitialized)
 381         {
 382                 skysphereinitialized = true;
 383                 skyspherecalc();
 384         }
 385
 386         // wrap the scroll values just to be extra kind to float accuracy
 387
 388         // scroll speed for upper layer
 389         speedscale = r_refdef.scene.time*r_skyscroll1.value*8.0/128.0;
 390         speedscale -= floor(speedscale);
 391         Matrix4x4_CreateTranslate(&scroll1matrix, speedscale, speedscale, 0);
 392         // scroll speed for lower layer (transparent layer)
 393         speedscale = r_refdef.scene.time*r_skyscroll2.value*8.0/128.0;
 394         speedscale -= floor(speedscale);
 395         Matrix4x4_CreateTranslate(&scroll2matrix, speedscale, speedscale, 0);
 396
 397         // FIXME: fixed function path can't properly handle r_refdef.view.colorscale > 1
 398         GL_Color(1 * r_refdef.view.colorscale, 1 * r_refdef.view.colorscale, 1 * r_refdef.view.colorscale, 1);
 399         GL_BlendFunc(GL_ONE, GL_ZERO);
 400         GL_CullFace(GL_NONE);
 401         GL_DepthMask(true);
 402         GL_DepthRange(0, 1);
 403         GL_PolygonOffset(0, 0);
 404         GL_DepthTest(false); // don't modify or read zbuffer
 405         R_Mesh_VertexPointer(skysphere_vertex3f, 0, 0);
 406         R_Mesh_ColorPointer(NULL, 0, 0);
 407         R_Mesh_ResetTextureState();
 408         R_Mesh_TexBind(0, R_GetTexture(r_refdef.scene.worldmodel->brush.solidskytexture));
 409         R_Mesh_TexCoordPointer(0, 2, skysphere_texcoord2f, 0, 0);
 410         R_Mesh_TexMatrix(0, &scroll1matrix);
 411         if (r_textureunits.integer >= 2 && r_refdef.view.colorscale == 1)
 412         {
 413                 // one pass using GL_DECAL or GL_INTERPOLATE_ARB for alpha layer
 414                 R_SetupGenericTwoTextureShader(GL_DECAL);
 415                 R_Mesh_TexBind(1, R_GetTexture(r_refdef.scene.worldmodel->brush.alphaskytexture));
 416                 R_Mesh_TexCoordPointer(1, 2, skysphere_texcoord2f, 0, 0);
 417                 R_Mesh_TexMatrix(1, &scroll2matrix);
 418                 GL_LockArrays(0, skysphere_numverts);
 419                 R_Mesh_Draw(0, skysphere_numverts, 0, skysphere_numtriangles, NULL, skysphere_elements, 0, 0);
 420                 GL_LockArrays(0, 0);
 421                 R_Mesh_TexBind(1, 0);
 422         }
 423         else
 424         {
 425                 // two pass
 426                 R_SetupGenericShader(true);
 427                 GL_LockArrays(0, skysphere_numverts);
 428                 R_Mesh_Draw(0, skysphere_numverts, 0, skysphere_numtriangles, NULL, skysphere_elements, 0, 0);
 429
 430                 GL_BlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 431                 R_Mesh_TexBind(0, R_GetTexture(r_refdef.scene.worldmodel->brush.alphaskytexture));
 432                 R_Mesh_TexMatrix(0, &scroll2matrix);
 433                 GL_LockArrays(0, skysphere_numverts);
 434                 R_Mesh_Draw(0, skysphere_numverts, 0, skysphere_numtriangles, NULL, skysphere_elements, 0, 0);
 435                 GL_LockArrays(0, 0);
 436         }
 437
 438         if(r_refdef.fogenabled)
 439         {
 440                 R_SetupGenericShader(false);
 441                 R_Mesh_TexBind(0, 0);
 442                 GL_BlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 443                 GL_Color(r_refdef.fogcolor[0], r_refdef.fogcolor[1], r_refdef.fogcolor[2], 1 - r_refdef.fogmasktable[FOGMASKTABLEWIDTH-1]);
 444                 GL_LockArrays(0, skysphere_numverts);
 445                 R_Mesh_Draw(0, skysphere_numverts, 0, skysphere_numtriangles, NULL, skysphere_elements, 0, 0);
 446                 GL_LockArrays(0, 0);
 447         }
 448 }
 449
 450 void R_Sky(void)
 451 {
 452         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));
 453         Matrix4x4_Invert_Simple(&skyinversematrix, &skymatrix);
 454
 455         R_Mesh_Matrix(&skymatrix);
 456         if (skyrendersphere)
 457         {
 458                 // this does not modify depth buffer
 459                 R_SkySphere();
 460         }
 461         else if (skyrenderbox)
 462         {
 463                 // this does not modify depth buffer
 464                 R_SkyBox();
 465         }
 466         /* this will be skyroom someday
 467         else
 468         {
 469                 // this modifies the depth buffer so we have to clear it afterward
 470                 //R_SkyRoom();
 471                 // clear the depthbuffer that was used while rendering the skyroom
 472                 //GL_Clear(GL_DEPTH_BUFFER_BIT);
 473         }
 474         */
 475         GL_DepthRange(0, 1);
 476         GL_DepthTest(true);
 477         GL_DepthMask(true);
 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