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         memset(&m, 0, sizeof(m));
 131         m.blendfunc1 = GL_ONE;
 132         m.blendfunc2 = GL_ZERO;
 133         m.depthdisable = true; // don't modify or read zbuffer
 134         m.tex[0] = R_GetTexture(skyboxside[3]); // front
 135         R_Mesh_State(&m);
 136
 137         GL_Color(r_colorscale, r_colorscale, r_colorscale, 1);
 138
 139         R_SkyBoxPolyVec(0, 1, 0,  1, -1,  1);
 140         R_SkyBoxPolyVec(1, 1, 1,  1, -1, -1);
 141         R_SkyBoxPolyVec(2, 0, 1,  1,  1, -1);
 142         R_SkyBoxPolyVec(3, 0, 0,  1,  1,  1);
 143         R_Mesh_Draw(4, 2, polygonelements);
 144         m.tex[0] = R_GetTexture(skyboxside[1]); // back
 145         R_Mesh_State(&m);
 146         R_SkyBoxPolyVec(0, 1, 0, -1,  1,  1);
 147         R_SkyBoxPolyVec(1, 1, 1, -1,  1, -1);
 148         R_SkyBoxPolyVec(2, 0, 1, -1, -1, -1);
 149         R_SkyBoxPolyVec(3, 0, 0, -1, -1,  1);
 150         R_Mesh_Draw(4, 2, polygonelements);
 151         m.tex[0] = R_GetTexture(skyboxside[0]); // right
 152         R_Mesh_State(&m);
 153         R_SkyBoxPolyVec(0, 1, 0,  1,  1,  1);
 154         R_SkyBoxPolyVec(1, 1, 1,  1,  1, -1);
 155         R_SkyBoxPolyVec(2, 0, 1, -1,  1, -1);
 156         R_SkyBoxPolyVec(3, 0, 0, -1,  1,  1);
 157         R_Mesh_Draw(4, 2, polygonelements);
 158         m.tex[0] = R_GetTexture(skyboxside[2]); // left
 159         R_Mesh_State(&m);
 160         R_SkyBoxPolyVec(0, 1, 0, -1, -1,  1);
 161         R_SkyBoxPolyVec(1, 1, 1, -1, -1, -1);
 162         R_SkyBoxPolyVec(2, 0, 1,  1, -1, -1);
 163         R_SkyBoxPolyVec(3, 0, 0,  1, -1,  1);
 164         R_Mesh_Draw(4, 2, polygonelements);
 165         m.tex[0] = R_GetTexture(skyboxside[4]); // up
 166         R_Mesh_State(&m);
 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         m.tex[0] = R_GetTexture(skyboxside[5]); // down
 173         R_Mesh_State(&m);
 174         R_SkyBoxPolyVec(0, 1, 0,  1,  1, -1);
 175         R_SkyBoxPolyVec(1, 1, 1,  1, -1, -1);
 176         R_SkyBoxPolyVec(2, 0, 1, -1, -1, -1);
 177         R_SkyBoxPolyVec(3, 0, 0, -1,  1, -1);
 178         R_Mesh_Draw(4, 2, polygonelements);
 179 }
 180
 181 #define skygridx 32
 182 #define skygridx1 (skygridx + 1)
 183 #define skygridxrecip (1.0f / (skygridx))
 184 #define skygridy 32
 185 #define skygridy1 (skygridy + 1)
 186 #define skygridyrecip (1.0f / (skygridy))
 187 #define skysphere_numverts (skygridx1 * skygridy1)
 188 #define skysphere_numtriangles (skygridx * skygridy * 2)
 189 static float skysphere_vertex[skysphere_numverts * 4];
 190 static float skysphere_texcoord[skysphere_numverts * 4];
 191 static int skysphere_elements[skysphere_numtriangles * 3];
 192
 193 static void skyspherecalc(void)
 194 {
 195         int i, j, *e;
 196         float a, b, x, ax, ay, v[3], length, *vertex, *texcoord;
 197         float dx, dy, dz;
 198         dx = 16;
 199         dy = 16;
 200         dz = 16 / 3;
 201         vertex = skysphere_vertex;
 202         texcoord = skysphere_texcoord;
 203         for (j = 0;j <= skygridy;j++)
 204         {
 205                 a = j * skygridyrecip;
 206                 ax = cos(a * M_PI * 2);
 207                 ay = -sin(a * M_PI * 2);
 208                 for (i = 0;i <= skygridx;i++)
 209                 {
 210                         b = i * skygridxrecip;
 211                         x = cos((b + 0.5) * M_PI);
 212                         v[0] = ax*x * dx;
 213                         v[1] = ay*x * dy;
 214                         v[2] = -sin((b + 0.5) * M_PI) * dz;
 215                         length = 3.0f / sqrt(v[0]*v[0]+v[1]*v[1]+(v[2]*v[2]*9));
 216                         *texcoord++ = v[0] * length;
 217                         *texcoord++ = v[1] * length;
 218                         *texcoord++ = 0;
 219                         *texcoord++ = 0;
 220                         *vertex++ = v[0];
 221                         *vertex++ = v[1];
 222                         *vertex++ = v[2];
 223                         *vertex++ = 1;
 224                 }
 225         }
 226         e = skysphere_elements;
 227         for (j = 0;j < skygridy;j++)
 228         {
 229                 for (i = 0;i < skygridx;i++)
 230                 {
 231                         *e++ =  j      * skygridx1 + i;
 232                         *e++ =  j      * skygridx1 + i + 1;
 233                         *e++ = (j + 1) * skygridx1 + i;
 234
 235                         *e++ =  j      * skygridx1 + i + 1;
 236                         *e++ = (j + 1) * skygridx1 + i + 1;
 237                         *e++ = (j + 1) * skygridx1 + i;
 238                 }
 239                 i++;
 240         }
 241 }
 242
 243 static void R_SkySphere(void)
 244 {
 245         int i;
 246         float speedscale, *t;
 247         static qboolean skysphereinitialized = false;
 248         rmeshstate_t m;
 249         if (!skysphereinitialized)
 250         {
 251                 skysphereinitialized = true;
 252                 skyspherecalc();
 253         }
 254
 255         // scroll speed for upper layer
 256         speedscale = cl.time*8.0/128.0;
 257         // wrap the scroll just to be extra kind to float accuracy
 258         speedscale -= (int)speedscale;
 259
 260         R_Mesh_ResizeCheck(skysphere_numverts);
 261
 262         memset(&m, 0, sizeof(m));
 263         m.blendfunc1 = GL_ONE;
 264         m.blendfunc2 = GL_ZERO;
 265         m.depthdisable = true; // don't modify or read zbuffer
 266         m.tex[0] = R_GetTexture(solidskytexture);
 267         R_Mesh_State(&m);
 268
 269         GL_Color(r_colorscale, r_colorscale, r_colorscale, 1);
 270
 271         memcpy(varray_vertex, skysphere_vertex, skysphere_numverts * sizeof(float[4]));
 272         memcpy(varray_texcoord[0], skysphere_texcoord, skysphere_numverts * sizeof(float[4]));
 273         for (i = 0, t = varray_texcoord[0];i < skysphere_numverts;i++, t += 4)
 274         {
 275                 t[0] += speedscale;
 276                 t[1] += speedscale;
 277         }
 278         R_Mesh_Draw(skysphere_numverts, skysphere_numtriangles, skysphere_elements);
 279
 280         m.blendfunc1 = GL_SRC_ALPHA;
 281         m.blendfunc2 = GL_ONE_MINUS_SRC_ALPHA;
 282         m.tex[0] = R_GetTexture(alphaskytexture);
 283         R_Mesh_State(&m);
 284
 285         // scroll it again, this makes the lower cloud layer scroll twice as fast (just like quake did)
 286         for (i = 0, t = varray_texcoord[0];i < skysphere_numverts;i++, t += 4)
 287         {
 288                 t[0] += speedscale;
 289                 t[1] += speedscale;
 290         }
 291         R_Mesh_Draw(skysphere_numverts, skysphere_numtriangles, skysphere_elements);
 292 }
 293
 294 void R_Sky(void)
 295 {
 296         matrix4x4_t skymatrix;
 297         if (skyrendermasked)
 298         {
 299                 Matrix4x4_CreateTranslate(&skymatrix, r_origin[0], r_origin[1], r_origin[2]);
 300                 R_Mesh_Matrix(&skymatrix);
 301                 if (skyrendersphere)
 302                 {
 303                         // this does not modify depth buffer
 304                         R_SkySphere();
 305                 }
 306                 else if (skyrenderbox)
 307                 {
 308                         // this does not modify depth buffer
 309                         R_SkyBox();
 310                 }
 311                 /* this will be skyroom someday
 312                 else
 313                 {
 314                         // this modifies the depth buffer so we have to clear it afterward
 315                         //R_SkyRoom();
 316                         // clear the depthbuffer that was used while rendering the skyroom
 317                         //qglClear(GL_DEPTH_BUFFER_BIT);
 318                 }
 319                 */
 320         }
 321 }
 322
 323 //===============================================================
 324
 325 /*
 326 =============
 327 R_InitSky
 328
 329 A sky texture is 256*128, with the right side being a masked overlay
 330 ==============
 331 */
 332 void R_InitSky (qbyte *src, int bytesperpixel)
 333 {
 334         int i, j, p, r, g, b;
 335         qbyte skyupperlayerpixels[128*128*4], skylowerlayerpixels[128*128*4];
 336         unsigned trans[128*128], transpix, *rgba;
 337
 338         skyavailable_quake = true;
 339
 340         // flush skytexturepool so we won't build up a leak from uploading textures multiple times
 341         R_FreeTexturePool(&skytexturepool);
 342         skytexturepool = R_AllocTexturePool();
 343         solidskytexture = NULL;
 344         alphaskytexture = NULL;
 345
 346         if (bytesperpixel == 4)
 347         {
 348                 for (i = 0;i < 128;i++)
 349                         for (j = 0;j < 128;j++)
 350                                 trans[(i*128) + j] = ((unsigned *)src)[i*256+j+128];
 351         }
 352         else
 353         {
 354                 // make an average value for the back to avoid
 355                 // a fringe on the top level
 356                 r = g = b = 0;
 357                 for (i=0 ; i<128 ; i++)
 358                 {
 359                         for (j=0 ; j<128 ; j++)
 360                         {
 361                                 p = src[i*256 + j + 128];
 362                                 rgba = &palette_complete[p];
 363                                 trans[(i*128) + j] = *rgba;
 364                                 r += ((qbyte *)rgba)[0];
 365                                 g += ((qbyte *)rgba)[1];
 366                                 b += ((qbyte *)rgba)[2];
 367                         }
 368                 }
 369
 370                 ((qbyte *)&transpix)[0] = r/(128*128);
 371                 ((qbyte *)&transpix)[1] = g/(128*128);
 372                 ((qbyte *)&transpix)[2] = b/(128*128);
 373                 ((qbyte *)&transpix)[3] = 0;
 374         }
 375
 376         memcpy(skyupperlayerpixels, trans, 128*128*4);
 377
 378         solidskytexture = R_LoadTexture2D(skytexturepool, "sky_solidtexture", 128, 128, (qbyte *) trans, TEXTYPE_RGBA, TEXF_PRECACHE, NULL);
 379
 380         if (bytesperpixel == 4)
 381         {
 382                 for (i = 0;i < 128;i++)
 383                         for (j = 0;j < 128;j++)
 384                                 trans[(i*128) + j] = ((unsigned *)src)[i*256+j];
 385         }
 386         else
 387         {
 388                 for (i=0 ; i<128 ; i++)
 389                 {
 390                         for (j=0 ; j<128 ; j++)
 391                         {
 392                                 p = src[i*256 + j];
 393                                 if (p == 0)
 394                                         trans[(i*128) + j] = transpix;
 395                                 else
 396                                         trans[(i*128) + j] = palette_complete[p];
 397                         }
 398                 }
 399         }
 400
 401         memcpy(skylowerlayerpixels, trans, 128*128*4);
 402
 403         alphaskytexture = R_LoadTexture2D(skytexturepool, "sky_alphatexture", 128, 128, (qbyte *) trans, TEXTYPE_RGBA, TEXF_ALPHA | TEXF_PRECACHE, NULL);
 404 }
 405
 406 void R_ResetQuakeSky(void)
 407 {
 408         skyavailable_quake = false;
 409 }
 410
 411 void R_ResetSkyBox(void)
 412 {
 413         skyboxside[0] = skyboxside[1] = skyboxside[2] = skyboxside[3] = skyboxside[4] = skyboxside[5] = NULL;
 414         skyname[0] = 0;
 415         skyavailable_box = false;
 416 }
 417
 418 static void r_sky_start(void)
 419 {
 420         skytexturepool = R_AllocTexturePool();
 421         solidskytexture = NULL;
 422         alphaskytexture = NULL;
 423 }
 424
 425 static void r_sky_shutdown(void)
 426 {
 427         R_FreeTexturePool(&skytexturepool);
 428         solidskytexture = NULL;
 429         alphaskytexture = NULL;
 430 }
 431
 432 static void r_sky_newmap(void)
 433 {
 434 }
 435
 436 void R_Sky_Init(void)
 437 {
 438         Cmd_AddCommand ("loadsky", &LoadSky_f);
 439         Cvar_RegisterVariable (&r_sky);
 440         R_RegisterModule("R_Sky", r_sky_start, r_sky_shutdown, r_sky_newmap);
 441 }