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         if (!skysphereinitialized)
 259         {
 260                 skysphereinitialized = true;
 261                 skyspherecalc();
 262         }
 263
 264         // scroll speed for upper layer
 265         speedscale = cl.time*8.0/128.0;
 266         // wrap the scroll just to be extra kind to float accuracy
 267         speedscale -= (int)speedscale;
 268
 269         memset(&m, 0, sizeof(m));
 270         m.blendfunc1 = GL_ONE;
 271         m.blendfunc2 = GL_ZERO;
 272         m.depthdisable = true; // don't modify or read zbuffer
 273         m.tex[0] = R_GetTexture(solidskytexture);
 274         R_Mesh_State(&m);
 275
 276         GL_Color(r_colorscale, r_colorscale, r_colorscale, 1);
 277
 278         R_Mesh_GetSpace(skysphere_numverts);
 279         R_Mesh_CopyVertex3f(skysphere_vertex3f, skysphere_numverts);
 280         for (i = 0, out2f = varray_texcoord2f[0], in2f = skysphere_texcoord2f;i < skysphere_numverts;i++)
 281         {
 282                 *out2f++ = *in2f++ + speedscale;
 283                 *out2f++ = *in2f++ + speedscale;
 284         }
 285         R_Mesh_Draw(skysphere_numverts, skysphere_numtriangles, skysphere_element3i);
 286
 287         m.blendfunc1 = GL_SRC_ALPHA;
 288         m.blendfunc2 = GL_ONE_MINUS_SRC_ALPHA;
 289         m.tex[0] = R_GetTexture(alphaskytexture);
 290         R_Mesh_State(&m);
 291
 292         // scroll the lower cloud layer twice as fast (just like quake did)
 293         speedscale *= 2;
 294
 295         R_Mesh_GetSpace(skysphere_numverts);
 296         R_Mesh_CopyVertex3f(skysphere_vertex3f, skysphere_numverts);
 297         for (i = 0, out2f = varray_texcoord2f[0], in2f = skysphere_texcoord2f;i < skysphere_numverts;i++)
 298         {
 299                 *out2f++ = *in2f++ + speedscale;
 300                 *out2f++ = *in2f++ + speedscale;
 301         }
 302         R_Mesh_Draw(skysphere_numverts, skysphere_numtriangles, skysphere_element3i);
 303 }
 304
 305 void R_Sky(void)
 306 {
 307         matrix4x4_t skymatrix;
 308         if (skyrendermasked)
 309         {
 310                 Matrix4x4_CreateTranslate(&skymatrix, r_origin[0], r_origin[1], r_origin[2]);
 311                 R_Mesh_Matrix(&skymatrix);
 312                 if (skyrendersphere)
 313                 {
 314                         // this does not modify depth buffer
 315                         R_SkySphere();
 316                 }
 317                 else if (skyrenderbox)
 318                 {
 319                         // this does not modify depth buffer
 320                         R_SkyBox();
 321                 }
 322                 /* this will be skyroom someday
 323                 else
 324                 {
 325                         // this modifies the depth buffer so we have to clear it afterward
 326                         //R_SkyRoom();
 327                         // clear the depthbuffer that was used while rendering the skyroom
 328                         //qglClear(GL_DEPTH_BUFFER_BIT);
 329                 }
 330                 */
 331         }
 332 }
 333
 334 //===============================================================
 335
 336 /*
 337 =============
 338 R_InitSky
 339
 340 A sky texture is 256*128, with the right side being a masked overlay
 341 ==============
 342 */
 343 void R_InitSky (qbyte *src, int bytesperpixel)
 344 {
 345         int i, j, p, r, g, b;
 346         qbyte skyupperlayerpixels[128*128*4], skylowerlayerpixels[128*128*4];
 347         unsigned trans[128*128], transpix, *rgba;
 348
 349         skyavailable_quake = true;
 350
 351         // flush skytexturepool so we won't build up a leak from uploading textures multiple times
 352         R_FreeTexturePool(&skytexturepool);
 353         skytexturepool = R_AllocTexturePool();
 354         solidskytexture = NULL;
 355         alphaskytexture = NULL;
 356
 357         if (bytesperpixel == 4)
 358         {
 359                 for (i = 0;i < 128;i++)
 360                         for (j = 0;j < 128;j++)
 361                                 trans[(i*128) + j] = ((unsigned *)src)[i*256+j+128];
 362         }
 363         else
 364         {
 365                 // make an average value for the back to avoid
 366                 // a fringe on the top level
 367                 r = g = b = 0;
 368                 for (i=0 ; i<128 ; i++)
 369                 {
 370                         for (j=0 ; j<128 ; j++)
 371                         {
 372                                 p = src[i*256 + j + 128];
 373                                 rgba = &palette_complete[p];
 374                                 trans[(i*128) + j] = *rgba;
 375                                 r += ((qbyte *)rgba)[0];
 376                                 g += ((qbyte *)rgba)[1];
 377                                 b += ((qbyte *)rgba)[2];
 378                         }
 379                 }
 380
 381                 ((qbyte *)&transpix)[0] = r/(128*128);
 382                 ((qbyte *)&transpix)[1] = g/(128*128);
 383                 ((qbyte *)&transpix)[2] = b/(128*128);
 384                 ((qbyte *)&transpix)[3] = 0;
 385         }
 386
 387         memcpy(skyupperlayerpixels, trans, 128*128*4);
 388
 389         solidskytexture = R_LoadTexture2D(skytexturepool, "sky_solidtexture", 128, 128, (qbyte *) trans, TEXTYPE_RGBA, TEXF_PRECACHE, NULL);
 390
 391         if (bytesperpixel == 4)
 392         {
 393                 for (i = 0;i < 128;i++)
 394                         for (j = 0;j < 128;j++)
 395                                 trans[(i*128) + j] = ((unsigned *)src)[i*256+j];
 396         }
 397         else
 398         {
 399                 for (i=0 ; i<128 ; i++)
 400                 {
 401                         for (j=0 ; j<128 ; j++)
 402                         {
 403                                 p = src[i*256 + j];
 404                                 if (p == 0)
 405                                         trans[(i*128) + j] = transpix;
 406                                 else
 407                                         trans[(i*128) + j] = palette_complete[p];
 408                         }
 409                 }
 410         }
 411
 412         memcpy(skylowerlayerpixels, trans, 128*128*4);
 413
 414         alphaskytexture = R_LoadTexture2D(skytexturepool, "sky_alphatexture", 128, 128, (qbyte *) trans, TEXTYPE_RGBA, TEXF_ALPHA | TEXF_PRECACHE, NULL);
 415 }
 416
 417 void R_ResetQuakeSky(void)
 418 {
 419         skyavailable_quake = false;
 420 }
 421
 422 void R_ResetSkyBox(void)
 423 {
 424         skyboxside[0] = skyboxside[1] = skyboxside[2] = skyboxside[3] = skyboxside[4] = skyboxside[5] = NULL;
 425         skyname[0] = 0;
 426         skyavailable_box = false;
 427 }
 428
 429 static void r_sky_start(void)
 430 {
 431         skytexturepool = R_AllocTexturePool();
 432         solidskytexture = NULL;
 433         alphaskytexture = NULL;
 434 }
 435
 436 static void r_sky_shutdown(void)
 437 {
 438         R_FreeTexturePool(&skytexturepool);
 439         solidskytexture = NULL;
 440         alphaskytexture = NULL;
 441 }
 442
 443 static void r_sky_newmap(void)
 444 {
 445 }
 446
 447 void R_Sky_Init(void)
 448 {
 449         Cmd_AddCommand ("loadsky", &LoadSky_f);
 450         Cvar_RegisterVariable (&r_sky);
 451         R_RegisterModule("R_Sky", r_sky_start, r_sky_shutdown, r_sky_newmap);
 452 }