ref: c994e5681e1db75fe14a52d4be7ac461993c1f39
dir: /r_sky.c/
#include <u.h> #include <libc.h> #include "quakedef.h" #include "r_local.h" #include "d_local.h" int iskyspeed = 8; int iskyspeed2 = 2; float skyspeed, skyspeed2; float skytime; byte *r_skysource; int r_skymade; int r_skydirect; // not used? // TODO: clean up these routines byte bottomsky[128*131]; byte bottommask[128*131]; byte newsky[128*256]; // newsky and topsky both pack in here, 128 bytes // of newsky on the left of each scan, 128 bytes // of topsky on the right, because the low-level // drawers need 256-byte scan widths /* ============= R_InitSky A sky texture is 256*128, with the right side being a masked overlay ============== */ void R_InitSky (texture_t *mt) { int i, j; byte *src; src = (byte *)mt + mt->offsets[0]; for (i=0 ; i<128 ; i++) { for (j=0 ; j<128 ; j++) { newsky[(i*256) + j + 128] = src[i*256 + j + 128]; } } for (i=0 ; i<128 ; i++) { for (j=0 ; j<131 ; j++) { if (src[i*256 + (j & 0x7F)]) { bottomsky[(i*131) + j] = src[i*256 + (j & 0x7F)]; bottommask[(i*131) + j] = 0; } else { bottomsky[(i*131) + j] = 0; bottommask[(i*131) + j] = 0xff; } } } r_skysource = newsky; } /* ================= R_MakeSky ================= */ void R_MakeSky (void) { int x, y; int ofs, baseofs; int xshift, yshift; unsigned *pnewsky; static int xlast = -1, ylast = -1; xshift = skytime*skyspeed; yshift = skytime*skyspeed; if ((xshift == xlast) && (yshift == ylast)) return; xlast = xshift; ylast = yshift; pnewsky = (unsigned *)&newsky[0]; for (y=0 ; y<SKYSIZE ; y++) { baseofs = ((y+yshift) & SKYMASK) * 131; // FIXME: clean this up #ifdef UNALIGNED_OK for (x=0 ; x<SKYSIZE ; x += 4) { ofs = baseofs + ((x+xshift) & SKYMASK); // PORT: unaligned dword access to bottommask and bottomsky *pnewsky = (*(pnewsky + (128 / sizeof (unsigned))) & *(unsigned *)&bottommask[ofs]) | *(unsigned *)&bottomsky[ofs]; pnewsky++; } #endif /* UNALIGNED_OK */ #ifndef UNALIGNED_OK for (x=0 ; x<SKYSIZE ; x++) { ofs = baseofs + ((x+xshift) & SKYMASK); *(byte *)pnewsky = (*((byte *)pnewsky + 128) & *(byte *)&bottommask[ofs]) | *(byte *)&bottomsky[ofs]; pnewsky = (unsigned *)((byte *)pnewsky + 1); } #endif /* ! UNALIGNED_OK */ pnewsky += 128 / sizeof (unsigned); } r_skymade = 1; } /* ================= R_GenSkyTile ================= */ void R_GenSkyTile (void *pdest) { int x, y; int ofs, baseofs; int xshift, yshift; unsigned *pnewsky; unsigned *pd; xshift = skytime*skyspeed; yshift = skytime*skyspeed; pnewsky = (unsigned *)&newsky[0]; pd = (unsigned *)pdest; for (y=0 ; y<SKYSIZE ; y++) { baseofs = ((y+yshift) & SKYMASK) * 131; // FIXME: clean this up #ifdef UNALIGNED_OK for (x=0 ; x<SKYSIZE ; x += 4) { ofs = baseofs + ((x+xshift) & SKYMASK); // PORT: unaligned dword access to bottommask and bottomsky *pd = (*(pnewsky + (128 / sizeof (unsigned))) & *(unsigned *)&bottommask[ofs]) | *(unsigned *)&bottomsky[ofs]; pnewsky++; pd++; } #endif /* UNALIGNED_OK */ #ifndef UNALIGNED_OK for (x=0 ; x<SKYSIZE ; x++) { ofs = baseofs + ((x+xshift) & SKYMASK); *(byte *)pd = (*((byte *)pnewsky + 128) & *(byte *)&bottommask[ofs]) | *(byte *)&bottomsky[ofs]; pnewsky = (unsigned *)((byte *)pnewsky + 1); pd = (unsigned *)((byte *)pd + 1); } #endif /* ! UNALIGNED_OK */ pnewsky += 128 / sizeof (unsigned); } } /* ================= R_GenSkyTile16 ================= */ void R_GenSkyTile16 (void *pdest) { int x, y; int ofs, baseofs; int xshift, yshift; byte *pnewsky; unsigned short *pd; xshift = skytime * skyspeed; yshift = skytime * skyspeed; pnewsky = (byte *)&newsky[0]; pd = (unsigned short *)pdest; for (y=0 ; y<SKYSIZE ; y++) { baseofs = ((y+yshift) & SKYMASK) * 131; // FIXME: clean this up // FIXME: do faster unaligned version? for (x=0 ; x<SKYSIZE ; x++) { ofs = baseofs + ((x+xshift) & SKYMASK); *pd = d_8to16table[(*(pnewsky + 128) & *(byte *)&bottommask[ofs]) | *(byte *)&bottomsky[ofs]]; pnewsky++; pd++; } pnewsky += TILE_SIZE; } } /* ============= R_SetSkyFrame ============== */ void R_SetSkyFrame (void) { int g, s1, s2; float temp; skyspeed = iskyspeed; skyspeed2 = iskyspeed2; g = GreatestCommonDivisor (iskyspeed, iskyspeed2); s1 = iskyspeed / g; s2 = iskyspeed2 / g; temp = SKYSIZE * s1 * s2; skytime = cl.time - ((int)(cl.time / temp) * temp); r_skymade = 0; }