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         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 && !r_refdef.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 && 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 int R_LoadSkyBox(void)
  88 {
  89         int i, j, success;
  90         int indices[4] = {0,1,2,3};
  91         char name[MAX_INPUTLINE];
  92         unsigned char *image_rgba;
  93         unsigned char *temp;
  94
  95         R_UnloadSkyBox();
  96
  97         if (!skyname[0])
  98                 return true;
  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 = (unsigned char *)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                 return false;
 130
 131         return true;
 132 }
 133
 134 int R_SetSkyBox(const char *sky)
 135 {
 136         if (strcmp(sky, skyname) == 0) // no change
 137                 return true;
 138
 139         if (strlen(sky) > 1000)
 140         {
 141                 Con_Printf("sky name too long (%i, max is 1000)\n", (int)strlen(sky));
 142                 return false;
 143         }
 144
 145         strlcpy(skyname, sky, sizeof(skyname));
 146
 147         return R_LoadSkyBox();
 148 }
 149
 150 // LordHavoc: added LoadSky console command
 151 void LoadSky_f (void)
 152 {
 153         switch (Cmd_Argc())
 154         {
 155         case 1:
 156                 if (skyname[0])
 157                         Con_Printf("current sky: %s\n", skyname);
 158                 else
 159                         Con_Print("no skybox has been set\n");
 160                 break;
 161         case 2:
 162                 if (R_SetSkyBox(Cmd_Argv(1)))
 163                 {
 164                         if (skyname[0])
 165                                 Con_Printf("skybox set to %s\n", skyname);
 166                         else
 167                                 Con_Print("skybox disabled\n");
 168                 }
 169                 else
 170                         Con_Printf("failed to load skybox %s\n", Cmd_Argv(1));
 171                 break;
 172         default:
 173                 Con_Print("usage: loadsky skyname\n");
 174                 break;
 175         }
 176 }
 177
 178 float skyboxvertex3f[6*4*3] =
 179 {
 180         // skyside[0]
 181          16, -16,  16,
 182          16, -16, -16,
 183          16,  16, -16,
 184          16,  16,  16,
 185         // skyside[1]
 186         -16,  16,  16,
 187         -16,  16, -16,
 188         -16, -16, -16,
 189         -16, -16,  16,
 190         // skyside[2]
 191          16,  16,  16,
 192          16,  16, -16,
 193         -16,  16, -16,
 194         -16,  16,  16,
 195         // skyside[3]
 196         -16, -16,  16,
 197         -16, -16, -16,
 198          16, -16, -16,
 199          16, -16,  16,
 200         // skyside[4]
 201         -16, -16,  16,
 202          16, -16,  16,
 203          16,  16,  16,
 204         -16,  16,  16,
 205         // skyside[5]
 206          16, -16, -16,
 207         -16, -16, -16,
 208         -16,  16, -16,
 209          16,  16, -16
 210 };
 211
 212 float skyboxtexcoord2f[6*4*2] =
 213 {
 214         // skyside[0]
 215         0, 1,
 216         1, 1,
 217         1, 0,
 218         0, 0,
 219         // skyside[1]
 220         1, 0,
 221         0, 0,
 222         0, 1,
 223         1, 1,
 224         // skyside[2]
 225         1, 1,
 226         1, 0,
 227         0, 0,
 228         0, 1,
 229         // skyside[3]
 230         0, 0,
 231         0, 1,
 232         1, 1,
 233         1, 0,
 234         // skyside[4]
 235         0, 1,
 236         1, 1,
 237         1, 0,
 238         0, 0,
 239         // skyside[5]
 240         0, 1,
 241         1, 1,
 242         1, 0,
 243         0, 0
 244 };
 245
 246 int skyboxelements[6*2*3] =
 247 {
 248         // skyside[3]
 249          0,  1,  2,
 250          0,  2,  3,
 251         // skyside[1]
 252          4,  5,  6,
 253          4,  6,  7,
 254         // skyside[0]
 255          8,  9, 10,
 256          8, 10, 11,
 257         // skyside[2]
 258         12, 13, 14,
 259         12, 14, 15,
 260         // skyside[4]
 261         16, 17, 18,
 262         16, 18, 19,
 263         // skyside[5]
 264         20, 21, 22,
 265         20, 22, 23
 266 };
 267
 268 static void R_SkyBox(void)
 269 {
 270         int i;
 271         // FIXME: fixed function path can't properly handle r_view.colorscale > 1
 272         GL_Color(1 * r_view.colorscale, 1 * r_view.colorscale, 1 * r_view.colorscale, 1);
 273         GL_BlendFunc(GL_ONE, GL_ZERO);
 274         GL_DepthMask(false);
 275         GL_DepthRange(0, 1);
 276         GL_DepthTest(false); // don't modify or read zbuffer
 277         R_Mesh_VertexPointer(skyboxvertex3f, 0, 0);
 278         R_Mesh_ColorPointer(NULL, 0, 0);
 279         R_Mesh_ResetTextureState();
 280         R_Mesh_TexCoordPointer(0, 2, skyboxtexcoord2f, 0, 0);
 281         GL_LockArrays(0, 6*4);
 282         for (i = 0;i < 6;i++)
 283         {
 284                 R_Mesh_TexBind(0, R_GetTexture(skyboxside[i]));
 285                 R_Mesh_Draw(0, 6*4, 2, skyboxelements + i * 6, 0, 0);
 286         }
 287         GL_LockArrays(0, 0);
 288 }
 289
 290 #define skygridx 32
 291 #define skygridx1 (skygridx + 1)
 292 #define skygridxrecip (1.0f / (skygridx))
 293 #define skygridy 32
 294 #define skygridy1 (skygridy + 1)
 295 #define skygridyrecip (1.0f / (skygridy))
 296 #define skysphere_numverts (skygridx1 * skygridy1)
 297 #define skysphere_numtriangles (skygridx * skygridy * 2)
 298 static float skysphere_vertex3f[skysphere_numverts * 3];
 299 static float skysphere_texcoord2f[skysphere_numverts * 2];
 300 static int skysphere_element3i[skysphere_numtriangles * 3];
 301
 302 static void skyspherecalc(void)
 303 {
 304         int i, j, *e;
 305         float a, b, x, ax, ay, v[3], length, *vertex3f, *texcoord2f;
 306         float dx, dy, dz;
 307         dx = 16;
 308         dy = 16;
 309         dz = 16 / 3;
 310         vertex3f = skysphere_vertex3f;
 311         texcoord2f = skysphere_texcoord2f;
 312         for (j = 0;j <= skygridy;j++)
 313         {
 314                 a = j * skygridyrecip;
 315                 ax = cos(a * M_PI * 2);
 316                 ay = -sin(a * M_PI * 2);
 317                 for (i = 0;i <= skygridx;i++)
 318                 {
 319                         b = i * skygridxrecip;
 320                         x = cos((b + 0.5) * M_PI);
 321                         v[0] = ax*x * dx;
 322                         v[1] = ay*x * dy;
 323                         v[2] = -sin((b + 0.5) * M_PI) * dz;
 324                         length = 3.0f / sqrt(v[0]*v[0]+v[1]*v[1]+(v[2]*v[2]*9));
 325                         *texcoord2f++ = v[0] * length;
 326                         *texcoord2f++ = v[1] * length;
 327                         *vertex3f++ = v[0];
 328                         *vertex3f++ = v[1];
 329                         *vertex3f++ = v[2];
 330                 }
 331         }
 332         e = skysphere_element3i;
 333         for (j = 0;j < skygridy;j++)
 334         {
 335                 for (i = 0;i < skygridx;i++)
 336                 {
 337                         *e++ =  j      * skygridx1 + i;
 338                         *e++ =  j      * skygridx1 + i + 1;
 339                         *e++ = (j + 1) * skygridx1 + i;
 340
 341                         *e++ =  j      * skygridx1 + i + 1;
 342                         *e++ = (j + 1) * skygridx1 + i + 1;
 343                         *e++ = (j + 1) * skygridx1 + i;
 344                 }
 345         }
 346 }
 347
 348 static void R_SkySphere(void)
 349 {
 350         float speedscale;
 351         static qboolean skysphereinitialized = false;
 352         matrix4x4_t scroll1matrix, scroll2matrix;
 353         if (!skysphereinitialized)
 354         {
 355                 skysphereinitialized = true;
 356                 skyspherecalc();
 357         }
 358
 359         // wrap the scroll values just to be extra kind to float accuracy
 360
 361         // scroll speed for upper layer
 362         speedscale = r_refdef.time*r_skyscroll1.value*8.0/128.0;
 363         speedscale -= (int)speedscale;
 364         Matrix4x4_CreateTranslate(&scroll1matrix, speedscale, speedscale, 0);
 365         // scroll speed for lower layer (transparent layer)
 366         speedscale = r_refdef.time*r_skyscroll2.value*8.0/128.0;
 367         speedscale -= (int)speedscale;
 368         Matrix4x4_CreateTranslate(&scroll2matrix, speedscale, speedscale, 0);
 369
 370         // FIXME: fixed function path can't properly handle r_view.colorscale > 1
 371         GL_Color(1 * r_view.colorscale, 1 * r_view.colorscale, 1 * r_view.colorscale, 1);
 372         GL_BlendFunc(GL_ONE, GL_ZERO);
 373         GL_DepthMask(true);
 374         GL_DepthRange(0, 1);
 375         GL_DepthTest(false); // don't modify or read zbuffer
 376         R_Mesh_VertexPointer(skysphere_vertex3f, 0, 0);
 377         R_Mesh_ColorPointer(NULL, 0, 0);
 378         R_Mesh_ResetTextureState();
 379         R_Mesh_TexBind(0, R_GetTexture(r_refdef.worldmodel->brush.solidskytexture));
 380         R_Mesh_TexCoordPointer(0, 2, skysphere_texcoord2f, 0, 0);
 381         R_Mesh_TexMatrix(0, &scroll1matrix);
 382         if (r_textureunits.integer >= 2 && r_view.colorscale == 1)
 383         {
 384                 // one pass using GL_DECAL or GL_INTERPOLATE_ARB for alpha layer
 385                 R_Mesh_TexBind(1, R_GetTexture(r_refdef.worldmodel->brush.alphaskytexture));
 386                 R_Mesh_TexCombine(1, gl_combine.integer ? GL_INTERPOLATE_ARB : GL_DECAL, GL_MODULATE, 1, 1);
 387                 R_Mesh_TexCoordPointer(1, 2, skysphere_texcoord2f, 0, 0);
 388                 R_Mesh_TexMatrix(1, &scroll2matrix);
 389                 GL_LockArrays(0, skysphere_numverts);
 390                 R_Mesh_Draw(0, skysphere_numverts, skysphere_numtriangles, skysphere_element3i, 0, 0);
 391                 GL_LockArrays(0, 0);
 392         }
 393         else
 394         {
 395                 // two pass
 396                 GL_LockArrays(0, skysphere_numverts);
 397                 R_Mesh_Draw(0, skysphere_numverts, skysphere_numtriangles, skysphere_element3i, 0, 0);
 398
 399                 GL_BlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 400                 R_Mesh_TexBind(0, R_GetTexture(r_refdef.worldmodel->brush.alphaskytexture));
 401                 R_Mesh_TexMatrix(0, &scroll2matrix);
 402                 GL_LockArrays(0, skysphere_numverts);
 403                 R_Mesh_Draw(0, skysphere_numverts, skysphere_numtriangles, skysphere_element3i, 0, 0);
 404                 GL_LockArrays(0, 0);
 405         }
 406 }
 407
 408 void R_Sky(void)
 409 {
 410         matrix4x4_t skymatrix;
 411         if (skyrendermasked)
 412         {
 413                 Matrix4x4_CreateTranslate(&skymatrix, r_view.origin[0], r_view.origin[1], r_view.origin[2]);
 414                 R_Mesh_Matrix(&skymatrix);
 415                 if (skyrendersphere)
 416                 {
 417                         // this does not modify depth buffer
 418                         R_SkySphere();
 419                 }
 420                 else if (skyrenderbox)
 421                 {
 422                         // this does not modify depth buffer
 423                         R_SkyBox();
 424                 }
 425                 /* this will be skyroom someday
 426                 else
 427                 {
 428                         // this modifies the depth buffer so we have to clear it afterward
 429                         //R_SkyRoom();
 430                         // clear the depthbuffer that was used while rendering the skyroom
 431                         //GL_Clear(GL_DEPTH_BUFFER_BIT);
 432                 }
 433                 */
 434                 GL_DepthRange(0, 1);
 435                 GL_DepthTest(true);
 436                 GL_DepthMask(true);
 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, "load a skybox by basename (for example loadsky mtnsun_ loads mtnsun_ft.tga and so on)");
 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