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_vertex[i * 4 + 0] = (x) * 16.0f;\
 125         varray_vertex[i * 4 + 1] = (y) * 16.0f;\
 126         varray_vertex[i * 4 + 2] = (z) * 16.0f;\
 127         varray_texcoord[0][i * 4 + 0] = (s);\
 128         varray_texcoord[0][i * 4 + 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_vertex[skysphere_numverts * 4];
 201 static float skysphere_texcoord[skysphere_numverts * 4];
 202 static int skysphere_elements[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, *vertex, *texcoord;
 208         float dx, dy, dz;
 209         dx = 16;
 210         dy = 16;
 211         dz = 16 / 3;
 212         vertex = skysphere_vertex;
 213         texcoord = skysphere_texcoord;
 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                         *texcoord++ = v[0] * length;
 228                         *texcoord++ = v[1] * length;
 229                         *texcoord++ = 0;
 230                         *texcoord++ = 0;
 231                         *vertex++ = v[0];
 232                         *vertex++ = v[1];
 233                         *vertex++ = v[2];
 234                         *vertex++ = 1;
 235                 }
 236         }
 237         e = skysphere_elements;
 238         for (j = 0;j < skygridy;j++)
 239         {
 240                 for (i = 0;i < skygridx;i++)
 241                 {
 242                         *e++ =  j      * skygridx1 + i;
 243                         *e++ =  j      * skygridx1 + i + 1;
 244                         *e++ = (j + 1) * skygridx1 + i;
 245
 246                         *e++ =  j      * skygridx1 + i + 1;
 247                         *e++ = (j + 1) * skygridx1 + i + 1;
 248                         *e++ = (j + 1) * skygridx1 + i;
 249                 }
 250                 i++;
 251         }
 252 }
 253
 254 static void R_SkySphere(void)
 255 {
 256         int i;
 257         float speedscale, *t;
 258         static qboolean skysphereinitialized = false;
 259         rmeshstate_t m;
 260         if (!skysphereinitialized)
 261         {
 262                 skysphereinitialized = true;
 263                 skyspherecalc();
 264         }
 265
 266         // scroll speed for upper layer
 267         speedscale = cl.time*8.0/128.0;
 268         // wrap the scroll just to be extra kind to float accuracy
 269         speedscale -= (int)speedscale;
 270
 271         memset(&m, 0, sizeof(m));
 272         m.blendfunc1 = GL_ONE;
 273         m.blendfunc2 = GL_ZERO;
 274         m.depthdisable = true; // don't modify or read zbuffer
 275         m.tex[0] = R_GetTexture(solidskytexture);
 276         R_Mesh_State(&m);
 277
 278         GL_Color(r_colorscale, r_colorscale, r_colorscale, 1);
 279
 280         R_Mesh_GetSpace(skysphere_numverts);
 281         memcpy(varray_vertex, skysphere_vertex, skysphere_numverts * sizeof(float[4]));
 282         memcpy(varray_texcoord[0], skysphere_texcoord, skysphere_numverts * sizeof(float[4]));
 283         for (i = 0, t = varray_texcoord[0];i < skysphere_numverts;i++, t += 4)
 284         {
 285                 t[0] += speedscale;
 286                 t[1] += speedscale;
 287         }
 288         R_Mesh_Draw(skysphere_numverts, skysphere_numtriangles, skysphere_elements);
 289
 290         m.blendfunc1 = GL_SRC_ALPHA;
 291         m.blendfunc2 = GL_ONE_MINUS_SRC_ALPHA;
 292         m.tex[0] = R_GetTexture(alphaskytexture);
 293         R_Mesh_State(&m);
 294
 295         // scroll the lower cloud layer twice as fast (just like quake did)
 296         speedscale *= 2;
 297
 298         R_Mesh_GetSpace(skysphere_numverts);
 299         memcpy(varray_vertex, skysphere_vertex, skysphere_numverts * sizeof(float[4]));
 300         memcpy(varray_texcoord[0], skysphere_texcoord, skysphere_numverts * sizeof(float[4]));
 301         for (i = 0, t = varray_texcoord[0];i < skysphere_numverts;i++, t += 4)
 302         {
 303                 t[0] += speedscale;
 304                 t[1] += speedscale;
 305         }
 306         R_Mesh_Draw(skysphere_numverts, skysphere_numtriangles, skysphere_elements);
 307 }
 308
 309 void R_Sky(void)
 310 {
 311         matrix4x4_t skymatrix;
 312         if (skyrendermasked)
 313         {
 314                 Matrix4x4_CreateTranslate(&skymatrix, r_origin[0], r_origin[1], r_origin[2]);
 315                 R_Mesh_Matrix(&skymatrix);
 316                 if (skyrendersphere)
 317                 {
 318                         // this does not modify depth buffer
 319                         R_SkySphere();
 320                 }
 321                 else if (skyrenderbox)
 322                 {
 323                         // this does not modify depth buffer
 324                         R_SkyBox();
 325                 }
 326                 /* this will be skyroom someday
 327                 else
 328                 {
 329                         // this modifies the depth buffer so we have to clear it afterward
 330                         //R_SkyRoom();
 331                         // clear the depthbuffer that was used while rendering the skyroom
 332                         //qglClear(GL_DEPTH_BUFFER_BIT);
 333                 }
 334                 */
 335         }
 336 }
 337
 338 //===============================================================
 339
 340 /*
 341 =============
 342 R_InitSky
 343
 344 A sky texture is 256*128, with the right side being a masked overlay
 345 ==============
 346 */
 347 void R_InitSky (qbyte *src, int bytesperpixel)
 348 {
 349         int i, j, p, r, g, b;
 350         qbyte skyupperlayerpixels[128*128*4], skylowerlayerpixels[128*128*4];
 351         unsigned trans[128*128], transpix, *rgba;
 352
 353         skyavailable_quake = true;
 354
 355         // flush skytexturepool so we won't build up a leak from uploading textures multiple times
 356         R_FreeTexturePool(&skytexturepool);
 357         skytexturepool = R_AllocTexturePool();
 358         solidskytexture = NULL;
 359         alphaskytexture = NULL;
 360
 361         if (bytesperpixel == 4)
 362         {
 363                 for (i = 0;i < 128;i++)
 364                         for (j = 0;j < 128;j++)
 365                                 trans[(i*128) + j] = ((unsigned *)src)[i*256+j+128];
 366         }
 367         else
 368         {
 369                 // make an average value for the back to avoid
 370                 // a fringe on the top level
 371                 r = g = b = 0;
 372                 for (i=0 ; i<128 ; i++)
 373                 {
 374                         for (j=0 ; j<128 ; j++)
 375                         {
 376                                 p = src[i*256 + j + 128];
 377                                 rgba = &palette_complete[p];
 378                                 trans[(i*128) + j] = *rgba;
 379                                 r += ((qbyte *)rgba)[0];
 380                                 g += ((qbyte *)rgba)[1];
 381                                 b += ((qbyte *)rgba)[2];
 382                         }
 383                 }
 384
 385                 ((qbyte *)&transpix)[0] = r/(128*128);
 386                 ((qbyte *)&transpix)[1] = g/(128*128);
 387                 ((qbyte *)&transpix)[2] = b/(128*128);
 388                 ((qbyte *)&transpix)[3] = 0;
 389         }
 390
 391         memcpy(skyupperlayerpixels, trans, 128*128*4);
 392
 393         solidskytexture = R_LoadTexture2D(skytexturepool, "sky_solidtexture", 128, 128, (qbyte *) trans, TEXTYPE_RGBA, TEXF_PRECACHE, NULL);
 394
 395         if (bytesperpixel == 4)
 396         {
 397                 for (i = 0;i < 128;i++)
 398                         for (j = 0;j < 128;j++)
 399                                 trans[(i*128) + j] = ((unsigned *)src)[i*256+j];
 400         }
 401         else
 402         {
 403                 for (i=0 ; i<128 ; i++)
 404                 {
 405                         for (j=0 ; j<128 ; j++)
 406                         {
 407                                 p = src[i*256 + j];
 408                                 if (p == 0)
 409                                         trans[(i*128) + j] = transpix;
 410                                 else
 411                                         trans[(i*128) + j] = palette_complete[p];
 412                         }
 413                 }
 414         }
 415
 416         memcpy(skylowerlayerpixels, trans, 128*128*4);
 417
 418         alphaskytexture = R_LoadTexture2D(skytexturepool, "sky_alphatexture", 128, 128, (qbyte *) trans, TEXTYPE_RGBA, TEXF_ALPHA | TEXF_PRECACHE, NULL);
 419 }
 420
 421 void R_ResetQuakeSky(void)
 422 {
 423         skyavailable_quake = false;
 424 }
 425
 426 void R_ResetSkyBox(void)
 427 {
 428         skyboxside[0] = skyboxside[1] = skyboxside[2] = skyboxside[3] = skyboxside[4] = skyboxside[5] = NULL;
 429         skyname[0] = 0;
 430         skyavailable_box = false;
 431 }
 432
 433 static void r_sky_start(void)
 434 {
 435         skytexturepool = R_AllocTexturePool();
 436         solidskytexture = NULL;
 437         alphaskytexture = NULL;
 438 }
 439
 440 static void r_sky_shutdown(void)
 441 {
 442         R_FreeTexturePool(&skytexturepool);
 443         solidskytexture = NULL;
 444         alphaskytexture = NULL;
 445 }
 446
 447 static void r_sky_newmap(void)
 448 {
 449 }
 450
 451 void R_Sky_Init(void)
 452 {
 453         Cmd_AddCommand ("loadsky", &LoadSky_f);
 454         Cvar_RegisterVariable (&r_sky);
 455         R_RegisterModule("R_Sky", r_sky_start, r_sky_shutdown, r_sky_newmap);
 456 }