r_sky.c

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