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 qboolean skyavailable_quake;
   8 qboolean skyavailable_box;
   9 int skyrendernow;
  10 int skyrendermasked;
  11
  12 static rtexture_t *solidskytexture;
  13 static rtexture_t *alphaskytexture;
  14 static int skyrendersphere;
  15 static int skyrenderbox;
  16 static rtexturepool_t *skytexturepool;
  17 static char skyname[256];
  18 static char *suf[6] = {"rt", "bk", "lf", "ft", "up", "dn"};
  19 static rtexture_t *skyboxside[6];
  20
  21 void R_SkyStartFrame(void)
  22 {
  23         skyrendernow = false;
  24         skyrendersphere = false;
  25         skyrenderbox = false;
  26         skyrendermasked = false;
  27         if (r_sky.integer && !fogenabled)
  28         {
  29                 if (skyavailable_box)
  30                         skyrenderbox = true;
  31                 else if (skyavailable_quake)
  32                         skyrendersphere = true;
  33                 // for depth-masked sky, render the sky on the first sky surface encountered
  34                 skyrendernow = true;
  35                 skyrendermasked = true;
  36         }
  37 }
  38
  39 /*
  40 ==================
  41 R_SetSkyBox
  42 ==================
  43 */
  44 int R_SetSkyBox(const char *sky)
  45 {
  46         int i;
  47         char name[1024];
  48         qbyte *image_rgba;
  49
  50         if (strcmp(sky, skyname) == 0) // no change
  51                 return true;
  52
  53         skyboxside[0] = skyboxside[1] = skyboxside[2] = skyboxside[3] = skyboxside[4] = skyboxside[5] = NULL;
  54         skyavailable_box = false;
  55         skyname[0] = 0;
  56
  57         if (!sky[0])
  58                 return true;
  59
  60         if (strlen(sky) > 1000)
  61         {
  62                 Con_Printf ("sky name too long (%i, max is 1000)\n", strlen(sky));
  63                 return false;
  64         }
  65
  66         for (i = 0;i < 6;i++)
  67         {
  68                 sprintf (name, "env/%s%s", sky, suf[i]);
  69                 if (!(image_rgba = loadimagepixels(name, false, 0, 0)))
  70                 {
  71                         sprintf (name, "gfx/env/%s%s", sky, suf[i]);
  72                         if (!(image_rgba = loadimagepixels(name, false, 0, 0)))
  73                         {
  74                                 Con_Printf ("Couldn't load env/%s%s or gfx/env/%s%s\n", sky, suf[i], sky, suf[i]);
  75                                 continue;
  76                         }
  77                 }
  78                 skyboxside[i] = R_LoadTexture2D(skytexturepool, va("skyboxside%d", i), image_width, image_height, image_rgba, TEXTYPE_RGBA, TEXF_CLAMP | TEXF_PRECACHE, NULL);
  79                 Mem_Free(image_rgba);
  80         }
  81
  82         if (skyboxside[0] || skyboxside[1] || skyboxside[2] || skyboxside[3] || skyboxside[4] || skyboxside[5])
  83         {
  84                 skyavailable_box = true;
  85                 strcpy(skyname, sky);
  86                 return true;
  87         }
  88         return false;
  89 }
  90
  91 // LordHavoc: added LoadSky console command
  92 void LoadSky_f (void)
  93 {
  94         switch (Cmd_Argc())
  95         {
  96         case 1:
  97                 if (skyname[0])
  98                         Con_Printf("current sky: %s\n", skyname);
  99                 else
 100                         Con_Printf("no skybox has been set\n");
 101                 break;
 102         case 2:
 103                 if (R_SetSkyBox(Cmd_Argv(1)))
 104                 {
 105                         if (skyname[0])
 106                                 Con_Printf("skybox set to %s\n", skyname);
 107                         else
 108                                 Con_Printf("skybox disabled\n");
 109                 }
 110                 else
 111                         Con_Printf("failed to load skybox %s\n", Cmd_Argv(1));
 112                 break;
 113         default:
 114                 Con_Printf("usage: loadsky skyname\n");
 115                 break;
 116         }
 117 }
 118
 119 static void R_SkyBox(void)
 120 {
 121         rmeshstate_t m;
 122
 123 #define R_SkyBoxPolyVec(i,s,t,x,y,z) \
 124         varray_vertex3f[i * 3 + 0] = (x) * 16.0f;\
 125         varray_vertex3f[i * 3 + 1] = (y) * 16.0f;\
 126         varray_vertex3f[i * 3 + 2] = (z) * 16.0f;\
 127         varray_texcoord2f[0][i * 2 + 0] = (s);\
 128         varray_texcoord2f[0][i * 2 + 1] = (t);
 129
 130         GL_Color(r_colorscale, r_colorscale, r_colorscale, 1);
 131
 132         memset(&m, 0, sizeof(m));
 133         m.blendfunc1 = GL_ONE;
 134         m.blendfunc2 = GL_ZERO;
 135         m.depthdisable = true; // don't modify or read zbuffer
 136
 137         m.tex[0] = R_GetTexture(skyboxside[3]); // front
 138         R_Mesh_State(&m);
 139         R_Mesh_GetSpace(4);
 140         R_SkyBoxPolyVec(0, 1, 0,  1, -1,  1);
 141         R_SkyBoxPolyVec(1, 1, 1,  1, -1, -1);
 142         R_SkyBoxPolyVec(2, 0, 1,  1,  1, -1);
 143         R_SkyBoxPolyVec(3, 0, 0,  1,  1,  1);
 144         R_Mesh_Draw(4, 2, polygonelements);
 145
 146         m.tex[0] = R_GetTexture(skyboxside[1]); // back
 147         R_Mesh_TextureState(&m);
 148         R_Mesh_GetSpace(4);
 149         R_SkyBoxPolyVec(0, 1, 0, -1,  1,  1);
 150         R_SkyBoxPolyVec(1, 1, 1, -1,  1, -1);
 151         R_SkyBoxPolyVec(2, 0, 1, -1, -1, -1);
 152         R_SkyBoxPolyVec(3, 0, 0, -1, -1,  1);
 153         R_Mesh_Draw(4, 2, polygonelements);
 154
 155         m.tex[0] = R_GetTexture(skyboxside[0]); // right
 156         R_Mesh_TextureState(&m);
 157         R_Mesh_GetSpace(4);
 158         R_SkyBoxPolyVec(0, 1, 0,  1,  1,  1);
 159         R_SkyBoxPolyVec(1, 1, 1,  1,  1, -1);
 160         R_SkyBoxPolyVec(2, 0, 1, -1,  1, -1);
 161         R_SkyBoxPolyVec(3, 0, 0, -1,  1,  1);
 162         R_Mesh_Draw(4, 2, polygonelements);
 163
 164         m.tex[0] = R_GetTexture(skyboxside[2]); // left
 165         R_Mesh_TextureState(&m);
 166         R_Mesh_GetSpace(4);
 167         R_SkyBoxPolyVec(0, 1, 0, -1, -1,  1);
 168         R_SkyBoxPolyVec(1, 1, 1, -1, -1, -1);
 169         R_SkyBoxPolyVec(2, 0, 1,  1, -1, -1);
 170         R_SkyBoxPolyVec(3, 0, 0,  1, -1,  1);
 171         R_Mesh_Draw(4, 2, polygonelements);
 172
 173         m.tex[0] = R_GetTexture(skyboxside[4]); // up
 174         R_Mesh_TextureState(&m);
 175         R_Mesh_GetSpace(4);
 176         R_SkyBoxPolyVec(0, 1, 0,  1, -1,  1);
 177         R_SkyBoxPolyVec(1, 1, 1,  1,  1,  1);
 178         R_SkyBoxPolyVec(2, 0, 1, -1,  1,  1);
 179         R_SkyBoxPolyVec(3, 0, 0, -1, -1,  1);
 180         R_Mesh_Draw(4, 2, polygonelements);
 181
 182         m.tex[0] = R_GetTexture(skyboxside[5]); // down
 183         R_Mesh_TextureState(&m);
 184         R_Mesh_GetSpace(4);
 185         R_SkyBoxPolyVec(0, 1, 0,  1,  1, -1);
 186         R_SkyBoxPolyVec(1, 1, 1,  1, -1, -1);
 187         R_SkyBoxPolyVec(2, 0, 1, -1, -1, -1);
 188         R_SkyBoxPolyVec(3, 0, 0, -1,  1, -1);
 189         R_Mesh_Draw(4, 2, polygonelements);
 190 }
 191
 192 #define skygridx 32
 193 #define skygridx1 (skygridx + 1)
 194 #define skygridxrecip (1.0f / (skygridx))
 195 #define skygridy 32
 196 #define skygridy1 (skygridy + 1)
 197 #define skygridyrecip (1.0f / (skygridy))
 198 #define skysphere_numverts (skygridx1 * skygridy1)
 199 #define skysphere_numtriangles (skygridx * skygridy * 2)
 200 static float skysphere_vertex3f[skysphere_numverts * 3];
 201 static float skysphere_texcoord2f[skysphere_numverts * 2];
 202 static int skysphere_element3i[skysphere_numtriangles * 3];
 203
 204 static void skyspherecalc(void)
 205 {
 206         int i, j, *e;
 207         float a, b, x, ax, ay, v[3], length, *vertex3f, *texcoord2f;
 208         float dx, dy, dz;
 209         dx = 16;
 210         dy = 16;
 211         dz = 16 / 3;
 212         vertex3f = skysphere_vertex3f;
 213         texcoord2f = skysphere_texcoord2f;
 214         for (j = 0;j <= skygridy;j++)
 215         {
 216                 a = j * skygridyrecip;
 217                 ax = cos(a * M_PI * 2);
 218                 ay = -sin(a * M_PI * 2);
 219                 for (i = 0;i <= skygridx;i++)
 220                 {
 221                         b = i * skygridxrecip;
 222                         x = cos((b + 0.5) * M_PI);
 223                         v[0] = ax*x * dx;
 224                         v[1] = ay*x * dy;
 225                         v[2] = -sin((b + 0.5) * M_PI) * dz;
 226                         length = 3.0f / sqrt(v[0]*v[0]+v[1]*v[1]+(v[2]*v[2]*9));
 227                         *texcoord2f++ = v[0] * length;
 228                         *texcoord2f++ = v[1] * length;
 229                         *vertex3f++ = v[0];
 230                         *vertex3f++ = v[1];
 231                         *vertex3f++ = v[2];
 232                 }
 233         }
 234         e = skysphere_element3i;
 235         for (j = 0;j < skygridy;j++)
 236         {
 237                 for (i = 0;i < skygridx;i++)
 238                 {
 239                         *e++ =  j      * skygridx1 + i;
 240                         *e++ =  j      * skygridx1 + i + 1;
 241                         *e++ = (j + 1) * skygridx1 + i;
 242
 243                         *e++ =  j      * skygridx1 + i + 1;
 244                         *e++ = (j + 1) * skygridx1 + i + 1;
 245                         *e++ = (j + 1) * skygridx1 + i;
 246                 }
 247                 i++;
 248         }
 249 }
 250
 251 static void R_SkySphere(void)
 252 {
 253         int i;
 254         float speedscale, *out2f;
 255         const float *in2f;
 256         static qboolean skysphereinitialized = false;
 257         rmeshstate_t m;
 258         rcachearrayrequest_t request;
 259         if (!skysphereinitialized)
 260         {
 261                 skysphereinitialized = true;
 262                 skyspherecalc();
 263         }
 264
 265         // scroll speed for upper layer
 266         speedscale = cl.time*8.0/128.0;
 267         // wrap the scroll just to be extra kind to float accuracy
 268         speedscale -= (int)speedscale;
 269
 270         if (r_colorscale == 1 && r_textureunits.integer >= 2)
 271         {
 272                 // one pass using GL_DECAL or GL_INTERPOLATE_ARB for alpha layer
 273                 // LordHavoc: note that color is not set here because it does not
 274                 // matter with GL_REPLACE
 275                 memset(&m, 0, sizeof(m));
 276                 m.blendfunc1 = GL_ONE;
 277                 m.blendfunc2 = GL_ZERO;
 278                 m.depthdisable = true; // don't modify or read zbuffer
 279                 m.tex[0] = R_GetTexture(solidskytexture);
 280                 m.tex[1] = R_GetTexture(alphaskytexture);
 281                 m.texcombinergb[0] = GL_REPLACE;
 282                 m.texcombinergb[1] = gl_combine.integer ? GL_INTERPOLATE_ARB : GL_DECAL;
 283                 if (gl_mesh_copyarrays.integer)
 284                 {
 285                         R_Mesh_State(&m);
 286                         R_Mesh_GetSpace(skysphere_numverts);
 287                         R_Mesh_CopyVertex3f(skysphere_vertex3f, skysphere_numverts);
 288                         R_ScrollTexCoord2f(varray_texcoord2f[0], skysphere_texcoord2f, skysphere_numverts, speedscale, speedscale);
 289                         R_ScrollTexCoord2f(varray_texcoord2f[1], skysphere_texcoord2f, skysphere_numverts, speedscale*2, speedscale*2);
 290                 }
 291                 else
 292                 {
 293                         m.pointervertexcount = skysphere_numverts;
 294                         m.pointer_vertex = skysphere_vertex3f;
 295                         memset(&request, 0, sizeof(request));
 296                         request.data_size = skysphere_numverts * sizeof(float[2]);
 297                         request.id_pointer1 = skysphere_texcoord2f;
 298                         request.id_number1 = CRC_Block((void *)&speedscale, sizeof(speedscale));
 299                         if (R_Mesh_CacheArray(&request))
 300                                 R_ScrollTexCoord2f(request.data, skysphere_texcoord2f, skysphere_numverts, speedscale, speedscale);
 301                         m.pointer_texcoord[0] = request.data;
 302                         speedscale *= 2;
 303                         request.id_number1 = CRC_Block((void *)&speedscale, sizeof(speedscale));
 304                         if (R_Mesh_CacheArray(&request))
 305                                 R_ScrollTexCoord2f(request.data, skysphere_texcoord2f, skysphere_numverts, speedscale, speedscale);
 306                         m.pointer_texcoord[1] = request.data;
 307                         R_Mesh_State(&m);
 308                 }
 309                 R_Mesh_Draw(skysphere_numverts, skysphere_numtriangles, skysphere_element3i);
 310         }
 311         else
 312         {
 313                 // two pass
 314                 GL_Color(r_colorscale, r_colorscale, r_colorscale, 1);
 315                 memset(&m, 0, sizeof(m));
 316                 m.blendfunc1 = GL_ONE;
 317                 m.blendfunc2 = GL_ZERO;
 318                 m.depthdisable = true; // don't modify or read zbuffer
 319                 m.tex[0] = R_GetTexture(solidskytexture);
 320                 if (gl_mesh_copyarrays.integer)
 321                 {
 322                         R_Mesh_State(&m);
 323                         R_Mesh_GetSpace(skysphere_numverts);
 324                         R_Mesh_CopyVertex3f(skysphere_vertex3f, skysphere_numverts);
 325                         R_ScrollTexCoord2f(varray_texcoord2f[0], skysphere_texcoord2f, skysphere_numverts, speedscale, speedscale);
 326                 }
 327                 else
 328                 {
 329                         m.pointervertexcount = skysphere_numverts;
 330                         m.pointer_vertex = skysphere_vertex3f;
 331                         memset(&request, 0, sizeof(request));
 332                         request.data_size = skysphere_numverts * sizeof(float[2]);
 333                         request.id_pointer1 = skysphere_texcoord2f;
 334                         request.id_number1 = CRC_Block((void *)&speedscale, sizeof(speedscale));
 335                         if (R_Mesh_CacheArray(&request))
 336                                 R_ScrollTexCoord2f(request.data, skysphere_texcoord2f, skysphere_numverts, speedscale, speedscale);
 337                         m.pointer_texcoord[0] = request.data;
 338                         R_Mesh_State(&m);
 339                 }
 340                 R_Mesh_Draw(skysphere_numverts, skysphere_numtriangles, skysphere_element3i);
 341
 342                 // scroll the lower cloud layer twice as fast (just like quake did)
 343                 speedscale *= 2;
 344
 345                 m.blendfunc1 = GL_SRC_ALPHA;
 346                 m.blendfunc2 = GL_ONE_MINUS_SRC_ALPHA;
 347                 m.tex[0] = R_GetTexture(alphaskytexture);
 348                 if (gl_mesh_copyarrays.integer)
 349                 {
 350                         R_Mesh_State(&m);
 351                         R_Mesh_GetSpace(skysphere_numverts);
 352                         R_Mesh_CopyVertex3f(skysphere_vertex3f, skysphere_numverts);
 353                         R_ScrollTexCoord2f(varray_texcoord2f[0], skysphere_texcoord2f, skysphere_numverts, speedscale, speedscale);
 354                 }
 355                 else
 356                 {
 357                         m.pointervertexcount = skysphere_numverts;
 358                         m.pointer_vertex = skysphere_vertex3f;
 359                         request.data_size = skysphere_numverts * sizeof(float[2]);
 360                         request.id_pointer1 = skysphere_texcoord2f;
 361                         request.id_number1 = CRC_Block((void *)&speedscale, sizeof(speedscale));
 362                         if (R_Mesh_CacheArray(&request))
 363                                 R_ScrollTexCoord2f(request.data, skysphere_texcoord2f, skysphere_numverts, speedscale, speedscale);
 364                         m.pointer_texcoord[0] = request.data;
 365                         R_Mesh_State(&m);
 366                 }
 367                 R_Mesh_Draw(skysphere_numverts, skysphere_numtriangles, skysphere_element3i);
 368         }
 369 }
 370
 371 void R_Sky(void)
 372 {
 373         matrix4x4_t skymatrix;
 374         if (skyrendermasked)
 375         {
 376                 Matrix4x4_CreateTranslate(&skymatrix, r_origin[0], r_origin[1], r_origin[2]);
 377                 R_Mesh_Matrix(&skymatrix);
 378                 if (skyrendersphere)
 379                 {
 380                         // this does not modify depth buffer
 381                         R_SkySphere();
 382                 }
 383                 else if (skyrenderbox)
 384                 {
 385                         // this does not modify depth buffer
 386                         R_SkyBox();
 387                 }
 388                 /* this will be skyroom someday
 389                 else
 390                 {
 391                         // this modifies the depth buffer so we have to clear it afterward
 392                         //R_SkyRoom();
 393                         // clear the depthbuffer that was used while rendering the skyroom
 394                         //R_Mesh_EndBatch();
 395                         //qglClear(GL_DEPTH_BUFFER_BIT);
 396                 }
 397                 */
 398         }
 399 }
 400
 401 //===============================================================
 402
 403 /*
 404 =============
 405 R_InitSky
 406
 407 A sky texture is 256*128, with the right side being a masked overlay
 408 ==============
 409 */
 410 void R_InitSky (qbyte *src, int bytesperpixel)
 411 {
 412         int i, j, p, r, g, b;
 413         qbyte skyupperlayerpixels[128*128*4], skylowerlayerpixels[128*128*4];
 414         unsigned trans[128*128], transpix, *rgba;
 415
 416         skyavailable_quake = true;
 417
 418         // flush skytexturepool so we won't build up a leak from uploading textures multiple times
 419         R_FreeTexturePool(&skytexturepool);
 420         skytexturepool = R_AllocTexturePool();
 421         solidskytexture = NULL;
 422         alphaskytexture = NULL;
 423
 424         if (bytesperpixel == 4)
 425         {
 426                 for (i = 0;i < 128;i++)
 427                         for (j = 0;j < 128;j++)
 428                                 trans[(i*128) + j] = ((unsigned *)src)[i*256+j+128];
 429         }
 430         else
 431         {
 432                 // make an average value for the back to avoid
 433                 // a fringe on the top level
 434                 r = g = b = 0;
 435                 for (i=0 ; i<128 ; i++)
 436                 {
 437                         for (j=0 ; j<128 ; j++)
 438                         {
 439                                 p = src[i*256 + j + 128];
 440                                 rgba = &palette_complete[p];
 441                                 trans[(i*128) + j] = *rgba;
 442                                 r += ((qbyte *)rgba)[0];
 443                                 g += ((qbyte *)rgba)[1];
 444                                 b += ((qbyte *)rgba)[2];
 445                         }
 446                 }
 447
 448                 ((qbyte *)&transpix)[0] = r/(128*128);
 449                 ((qbyte *)&transpix)[1] = g/(128*128);
 450                 ((qbyte *)&transpix)[2] = b/(128*128);
 451                 ((qbyte *)&transpix)[3] = 0;
 452         }
 453
 454         memcpy(skyupperlayerpixels, trans, 128*128*4);
 455
 456         solidskytexture = R_LoadTexture2D(skytexturepool, "sky_solidtexture", 128, 128, (qbyte *) trans, TEXTYPE_RGBA, TEXF_PRECACHE, NULL);
 457
 458         if (bytesperpixel == 4)
 459         {
 460                 for (i = 0;i < 128;i++)
 461                         for (j = 0;j < 128;j++)
 462                                 trans[(i*128) + j] = ((unsigned *)src)[i*256+j];
 463         }
 464         else
 465         {
 466                 for (i=0 ; i<128 ; i++)
 467                 {
 468                         for (j=0 ; j<128 ; j++)
 469                         {
 470                                 p = src[i*256 + j];
 471                                 if (p == 0)
 472                                         trans[(i*128) + j] = transpix;
 473                                 else
 474                                         trans[(i*128) + j] = palette_complete[p];
 475                         }
 476                 }
 477         }
 478
 479         memcpy(skylowerlayerpixels, trans, 128*128*4);
 480
 481         alphaskytexture = R_LoadTexture2D(skytexturepool, "sky_alphatexture", 128, 128, (qbyte *) trans, TEXTYPE_RGBA, TEXF_ALPHA | TEXF_PRECACHE, NULL);
 482 }
 483
 484 void R_ResetQuakeSky(void)
 485 {
 486         skyavailable_quake = false;
 487 }
 488
 489 void R_ResetSkyBox(void)
 490 {
 491         skyboxside[0] = skyboxside[1] = skyboxside[2] = skyboxside[3] = skyboxside[4] = skyboxside[5] = NULL;
 492         skyname[0] = 0;
 493         skyavailable_box = false;
 494 }
 495
 496 static void r_sky_start(void)
 497 {
 498         skytexturepool = R_AllocTexturePool();
 499         solidskytexture = NULL;
 500         alphaskytexture = NULL;
 501 }
 502
 503 static void r_sky_shutdown(void)
 504 {
 505         R_FreeTexturePool(&skytexturepool);
 506         solidskytexture = NULL;
 507         alphaskytexture = NULL;
 508 }
 509
 510 static void r_sky_newmap(void)
 511 {
 512 }
 513
 514 void R_Sky_Init(void)
 515 {
 516         Cmd_AddCommand ("loadsky", &LoadSky_f);
 517         Cvar_RegisterVariable (&r_sky);
 518         R_RegisterModule("R_Sky", r_sky_start, r_sky_shutdown, r_sky_newmap);
 519 }