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 cvar_t r_skyscroll1 = {CVAR_SAVE, "r_skyscroll1", "1"};
   8 cvar_t r_skyscroll2 = {CVAR_SAVE, "r_skyscroll2", "2"};
   9 int skyrendernow;
  10 int skyrendermasked;
  11
  12 static int skyrendersphere;
  13 static int skyrenderbox;
  14 static rtexturepool_t *skytexturepool;
  15 static char skyname[256];
  16
  17 typedef struct suffixinfo_s
  18 {
  19         char *suffix;
  20         qboolean flipx, flipy, flipdiagonal;
  21 }
  22 suffixinfo_t;
  23 static 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 && !fogenabled)
  60         {
  61                 if (skyboxside[0] || skyboxside[1] || skyboxside[2] || skyboxside[3] || skyboxside[4] || skyboxside[5])
  62                         skyrenderbox = true;
  63                 else if (r_refdef.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         for (i = 0;i < 6;i++)
  80         {
  81                 if (skyboxside[i])
  82                         R_FreeTexture(skyboxside[i]);
  83                 skyboxside[i] = NULL;
  84         }
  85 }
  86
  87 void R_LoadSkyBox(void)
  88 {
  89         int i, j, success;
  90         int indices[4] = {0,1,2,3};
  91         char name[1024];
  92         qbyte *image_rgba;
  93         qbyte *temp;
  94
  95         R_UnloadSkyBox();
  96
  97         if (!skyname[0])
  98                 return;
  99
 100         for (j=0; j<3; j++)
 101         {
 102                 success = 0;
 103                 for (i=0; i<6; i++)
 104                 {
 105                         if (dpsnprintf(name, sizeof(name), "%s_%s", skyname, suffix[j][i].suffix) < 0 || !(image_rgba = loadimagepixels(name, false, 0, 0)))
 106                         {
 107                                 if (dpsnprintf(name, sizeof(name), "%s%s", skyname, suffix[j][i].suffix) < 0 || !(image_rgba = loadimagepixels(name, false, 0, 0)))
 108                                 {
 109                                         if (dpsnprintf(name, sizeof(name), "env/%s%s", skyname, suffix[j][i].suffix) < 0 || !(image_rgba = loadimagepixels(name, false, 0, 0)))
 110                                         {
 111                                                 if (dpsnprintf(name, sizeof(name), "gfx/env/%s%s", skyname, suffix[j][i].suffix) < 0 || !(image_rgba = loadimagepixels(name, false, 0, 0)))
 112                                                         continue;
 113                                         }
 114                                 }
 115                         }
 116                         temp = Mem_Alloc(tempmempool, image_width*image_height*4);
 117                         Image_CopyMux (temp, image_rgba, image_width, image_height, suffix[j][i].flipx, suffix[j][i].flipy, suffix[j][i].flipdiagonal, 4, 4, indices);
 118                         skyboxside[i] = R_LoadTexture2D(skytexturepool, va("skyboxside%d", i), image_width, image_height, temp, TEXTYPE_RGBA, TEXF_CLAMP | TEXF_PRECACHE, NULL);
 119                         Mem_Free(image_rgba);
 120                         Mem_Free(temp);
 121                         success++;
 122                 }
 123
 124                 if (success)
 125                         break;
 126         }
 127
 128         if (j == 3)
 129                 Con_Printf ("Failed to load %s as skybox\n", skyname);
 130 }
 131
 132 int R_SetSkyBox(const char *sky)
 133 {
 134         if (strcmp(sky, skyname) == 0) // no change
 135                 return true;
 136
 137         if (strlen(sky) > 1000)
 138         {
 139                 Con_Printf("sky name too long (%i, max is 1000)\n", strlen(sky));
 140                 return false;
 141         }
 142
 143         strcpy(skyname, sky);
 144
 145         R_LoadSkyBox();
 146
 147         if (!skyname[0])
 148                 return true;
 149         return false;
 150 }
 151
 152 // LordHavoc: added LoadSky console command
 153 void LoadSky_f (void)
 154 {
 155         switch (Cmd_Argc())
 156         {
 157         case 1:
 158                 if (skyname[0])
 159                         Con_Printf("current sky: %s\n", skyname);
 160                 else
 161                         Con_Print("no skybox has been set\n");
 162                 break;
 163         case 2:
 164                 if (R_SetSkyBox(Cmd_Argv(1)))
 165                 {
 166                         if (skyname[0])
 167                                 Con_Printf("skybox set to %s\n", skyname);
 168                         else
 169                                 Con_Print("skybox disabled\n");
 170                 }
 171                 else
 172                         Con_Printf("failed to load skybox %s\n", Cmd_Argv(1));
 173                 break;
 174         default:
 175                 Con_Print("usage: loadsky skyname\n");
 176                 break;
 177         }
 178 }
 179
 180 float skyboxvertex3f[6*4*3] =
 181 {
 182         // skyside[0]
 183          16, -16,  16,
 184          16, -16, -16,
 185          16,  16, -16,
 186          16,  16,  16,
 187         // skyside[1]
 188         -16,  16,  16,
 189         -16,  16, -16,
 190         -16, -16, -16,
 191         -16, -16,  16,
 192         // skyside[2]
 193          16,  16,  16,
 194          16,  16, -16,
 195         -16,  16, -16,
 196         -16,  16,  16,
 197         // skyside[3]
 198         -16, -16,  16,
 199         -16, -16, -16,
 200          16, -16, -16,
 201          16, -16,  16,
 202         // skyside[4]
 203         -16, -16,  16,
 204          16, -16,  16,
 205          16,  16,  16,
 206         -16,  16,  16,
 207         // skyside[5]
 208          16, -16, -16,
 209         -16, -16, -16,
 210         -16,  16, -16,
 211          16,  16, -16
 212 };
 213
 214 float skyboxtexcoord2f[6*4*2] =
 215 {
 216         // skyside[0]
 217         0, 1,
 218         1, 1,
 219         1, 0,
 220         0, 0,
 221         // skyside[1]
 222         1, 0,
 223         0, 0,
 224         0, 1,
 225         1, 1,
 226         // skyside[2]
 227         1, 1,
 228         1, 0,
 229         0, 0,
 230         0, 1,
 231         // skyside[3]
 232         0, 0,
 233         0, 1,
 234         1, 1,
 235         1, 0,
 236         // skyside[4]
 237         0, 1,
 238         1, 1,
 239         1, 0,
 240         0, 0,
 241         // skyside[5]
 242         0, 1,
 243         1, 1,
 244         1, 0,
 245         0, 0
 246 };
 247
 248 int skyboxelements[6*2*3] =
 249 {
 250         // skyside[3]
 251          0,  1,  2,
 252          0,  2,  3,
 253         // skyside[1]
 254          4,  5,  6,
 255          4,  6,  7,
 256         // skyside[0]
 257          8,  9, 10,
 258          8, 10, 11,
 259         // skyside[2]
 260         12, 13, 14,
 261         12, 14, 15,
 262         // skyside[4]
 263         16, 17, 18,
 264         16, 18, 19,
 265         // skyside[5]
 266         20, 21, 22,
 267         20, 22, 23
 268 };
 269
 270 static void R_SkyBox(void)
 271 {
 272         int i;
 273         rmeshstate_t m;
 274         GL_Color(1, 1, 1, 1);
 275         memset(&m, 0, sizeof(m));
 276         GL_BlendFunc(GL_ONE, GL_ZERO);
 277         GL_DepthMask(false);
 278         GL_DepthTest(false); // don't modify or read zbuffer
 279         m.pointer_vertex = skyboxvertex3f;
 280         m.pointer_texcoord[0] = skyboxtexcoord2f;
 281         GL_LockArrays(0, 6*4);
 282         for (i = 0;i < 6;i++)
 283         {
 284                 m.tex[0] = R_GetTexture(skyboxside[i]);
 285                 R_Mesh_State(&m);
 286                 R_Mesh_Draw(0, 6*4, 2, skyboxelements + i * 6);
 287         }
 288         GL_LockArrays(0, 0);
 289 }
 290
 291 #define skygridx 32
 292 #define skygridx1 (skygridx + 1)
 293 #define skygridxrecip (1.0f / (skygridx))
 294 #define skygridy 32
 295 #define skygridy1 (skygridy + 1)
 296 #define skygridyrecip (1.0f / (skygridy))
 297 #define skysphere_numverts (skygridx1 * skygridy1)
 298 #define skysphere_numtriangles (skygridx * skygridy * 2)
 299 static float skysphere_vertex3f[skysphere_numverts * 3];
 300 static float skysphere_texcoord2f[skysphere_numverts * 2];
 301 static int skysphere_element3i[skysphere_numtriangles * 3];
 302
 303 static void skyspherecalc(void)
 304 {
 305         int i, j, *e;
 306         float a, b, x, ax, ay, v[3], length, *vertex3f, *texcoord2f;
 307         float dx, dy, dz;
 308         dx = 16;
 309         dy = 16;
 310         dz = 16 / 3;
 311         vertex3f = skysphere_vertex3f;
 312         texcoord2f = skysphere_texcoord2f;
 313         for (j = 0;j <= skygridy;j++)
 314         {
 315                 a = j * skygridyrecip;
 316                 ax = cos(a * M_PI * 2);
 317                 ay = -sin(a * M_PI * 2);
 318                 for (i = 0;i <= skygridx;i++)
 319                 {
 320                         b = i * skygridxrecip;
 321                         x = cos((b + 0.5) * M_PI);
 322                         v[0] = ax*x * dx;
 323                         v[1] = ay*x * dy;
 324                         v[2] = -sin((b + 0.5) * M_PI) * dz;
 325                         length = 3.0f / sqrt(v[0]*v[0]+v[1]*v[1]+(v[2]*v[2]*9));
 326                         *texcoord2f++ = v[0] * length;
 327                         *texcoord2f++ = v[1] * length;
 328                         *vertex3f++ = v[0];
 329                         *vertex3f++ = v[1];
 330                         *vertex3f++ = v[2];
 331                 }
 332         }
 333         e = skysphere_element3i;
 334         for (j = 0;j < skygridy;j++)
 335         {
 336                 for (i = 0;i < skygridx;i++)
 337                 {
 338                         *e++ =  j      * skygridx1 + i;
 339                         *e++ =  j      * skygridx1 + i + 1;
 340                         *e++ = (j + 1) * skygridx1 + i;
 341
 342                         *e++ =  j      * skygridx1 + i + 1;
 343                         *e++ = (j + 1) * skygridx1 + i + 1;
 344                         *e++ = (j + 1) * skygridx1 + i;
 345                 }
 346         }
 347 }
 348
 349 static void R_SkySphere(void)
 350 {
 351         float speedscale;
 352         static qboolean skysphereinitialized = false;
 353         rmeshstate_t m;
 354         matrix4x4_t scroll1matrix, scroll2matrix;
 355         if (!skysphereinitialized)
 356         {
 357                 skysphereinitialized = true;
 358                 skyspherecalc();
 359         }
 360
 361         // wrap the scroll values just to be extra kind to float accuracy
 362
 363         // scroll speed for upper layer
 364         speedscale = r_refdef.time*r_skyscroll1.value*8.0/128.0;
 365         speedscale -= (int)speedscale;
 366         Matrix4x4_CreateTranslate(&scroll1matrix, speedscale, speedscale, 0);
 367         // scroll speed for lower layer (transparent layer)
 368         speedscale = r_refdef.time*r_skyscroll2.value*8.0/128.0;
 369         speedscale -= (int)speedscale;
 370         Matrix4x4_CreateTranslate(&scroll2matrix, speedscale, speedscale, 0);
 371
 372         GL_Color(1, 1, 1, 1);
 373         GL_BlendFunc(GL_ONE, GL_ZERO);
 374         GL_DepthMask(true);
 375         GL_DepthTest(false); // don't modify or read zbuffer
 376         memset(&m, 0, sizeof(m));
 377         m.pointer_vertex = skysphere_vertex3f;
 378         m.tex[0] = R_GetTexture(r_refdef.worldmodel->brush.solidskytexture);
 379         m.pointer_texcoord[0] = skysphere_texcoord2f;
 380         m.texmatrix[0] = scroll1matrix;
 381         if (r_textureunits.integer >= 2)
 382         {
 383                 // one pass using GL_DECAL or GL_INTERPOLATE_ARB for alpha layer
 384                 m.tex[1] = R_GetTexture(r_refdef.worldmodel->brush.alphaskytexture);
 385                 m.texcombinergb[1] = gl_combine.integer ? GL_INTERPOLATE_ARB : GL_DECAL;
 386                 m.pointer_texcoord[1] = skysphere_texcoord2f;
 387                 m.texmatrix[1] = scroll2matrix;
 388                 R_Mesh_State(&m);
 389                 GL_LockArrays(0, skysphere_numverts);
 390                 R_Mesh_Draw(0, skysphere_numverts, skysphere_numtriangles, skysphere_element3i);
 391                 GL_LockArrays(0, 0);
 392         }
 393         else
 394         {
 395                 // two pass
 396                 R_Mesh_State(&m);
 397                 GL_LockArrays(0, skysphere_numverts);
 398                 R_Mesh_Draw(0, skysphere_numverts, skysphere_numtriangles, skysphere_element3i);
 399                 GL_LockArrays(0, 0);
 400
 401                 GL_BlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 402                 m.tex[0] = R_GetTexture(r_refdef.worldmodel->brush.alphaskytexture);
 403                 m.texmatrix[0] = scroll2matrix;
 404                 R_Mesh_State(&m);
 405                 GL_LockArrays(0, skysphere_numverts);
 406                 R_Mesh_Draw(0, skysphere_numverts, skysphere_numtriangles, skysphere_element3i);
 407                 GL_LockArrays(0, 0);
 408         }
 409 }
 410
 411 void R_Sky(void)
 412 {
 413         matrix4x4_t skymatrix;
 414         if (skyrendermasked)
 415         {
 416                 Matrix4x4_CreateTranslate(&skymatrix, r_vieworigin[0], r_vieworigin[1], r_vieworigin[2]);
 417                 R_Mesh_Matrix(&skymatrix);
 418                 if (skyrendersphere)
 419                 {
 420                         // this does not modify depth buffer
 421                         R_SkySphere();
 422                 }
 423                 else if (skyrenderbox)
 424                 {
 425                         // this does not modify depth buffer
 426                         R_SkyBox();
 427                 }
 428                 /* this will be skyroom someday
 429                 else
 430                 {
 431                         // this modifies the depth buffer so we have to clear it afterward
 432                         //R_SkyRoom();
 433                         // clear the depthbuffer that was used while rendering the skyroom
 434                         //GL_Clear(GL_DEPTH_BUFFER_BIT);
 435                 }
 436                 */
 437         }
 438 }
 439
 440 //===============================================================
 441
 442 void R_ResetSkyBox(void)
 443 {
 444         R_UnloadSkyBox();
 445         skyname[0] = 0;
 446         R_LoadSkyBox();
 447 }
 448
 449 static void r_sky_start(void)
 450 {
 451         skytexturepool = R_AllocTexturePool();
 452         R_LoadSkyBox();
 453 }
 454
 455 static void r_sky_shutdown(void)
 456 {
 457         R_UnloadSkyBox();
 458         R_FreeTexturePool(&skytexturepool);
 459 }
 460
 461 static void r_sky_newmap(void)
 462 {
 463 }
 464
 465
 466 void R_Sky_Init(void)
 467 {
 468         Cmd_AddCommand ("loadsky", &LoadSky_f);
 469         Cvar_RegisterVariable (&r_sky);
 470         Cvar_RegisterVariable (&r_skyscroll1);
 471         Cvar_RegisterVariable (&r_skyscroll2);
 472         memset(&skyboxside, 0, sizeof(skyboxside));
 473         skyname[0] = 0;
 474         R_RegisterModule("R_Sky", r_sky_start, r_sky_shutdown, r_sky_newmap);
 475 }
 476