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greg |
2.1 |
#ifndef lint |
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greg |
2.17 |
static const char RCSid[] = "$Id: srcobstr.c,v 2.16 2011/02/14 20:13:38 greg Exp $"; |
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greg |
2.1 |
#endif |
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/* |
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* Source occlusion caching routines |
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*/ |
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#include "ray.h" |
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#include "otypes.h" |
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#include "otspecial.h" |
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greg |
2.14 |
#include "rtotypes.h" |
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greg |
2.1 |
#include "source.h" |
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#define ABS(x) ((x)>0 ? (x) : -(x)) |
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#if SHADCACHE /* preemptive shadow checking */ |
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greg |
2.13 |
OBJECT * antimodlist = NULL; /* set of clipped materials */ |
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greg |
2.7 |
static int /* cast source ray to first blocker */ |
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greg |
2.1 |
castshadow(int sn, FVECT rorg, FVECT rdir) |
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{ |
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RAY rt; |
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VCOPY(rt.rorg, rorg); |
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VCOPY(rt.rdir, rdir); |
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rt.rmax = 0; |
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greg |
2.12 |
rayorigin(&rt, PRIMARY, NULL, NULL); |
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greg |
2.7 |
/* check for intersection */ |
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while (localhit(&rt, &thescene)) { |
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RAY rt1 = rt; /* pretend we were aimed at source */ |
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rt1.crtype |= rt1.rtype = SHADOW; |
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rt1.rdir[0] = -rt.rdir[0]; |
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rt1.rdir[1] = -rt.rdir[1]; |
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rt1.rdir[2] = -rt.rdir[2]; |
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rt1.rod = -rt.rod; |
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VSUB(rt1.rorg, rt.rop, rt.rdir); |
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rt1.rot = 1.; |
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rt1.rsrc = sn; |
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greg |
2.1 |
/* record blocker */ |
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greg |
2.7 |
if (srcblocker(&rt1)) |
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return(1); |
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/* move past failed blocker */ |
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VSUM(rt.rorg, rt.rop, rt.rdir, FTINY); |
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rayclear(&rt); /* & try again... */ |
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} |
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return(0); /* found no blockers */ |
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greg |
2.1 |
} |
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greg |
2.8 |
void /* initialize occlusion cache */ |
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greg |
2.1 |
initobscache(int sn) |
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{ |
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register SRCREC *srcp = &source[sn]; |
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int cachelen; |
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FVECT rorg, rdir; |
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RREAL d; |
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int i, j, k; |
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greg |
2.17 |
int ax=0, ax1=1, ax2=2; |
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greg |
2.1 |
|
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greg |
2.8 |
if (srcp->sflags & (SSKIP|SPROX|SSPOT|SVIRTUAL)) |
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return; /* don't cache these */ |
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greg |
2.1 |
if (srcp->sflags & SDISTANT) |
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cachelen = 4*SHADCACHE*SHADCACHE; |
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else if (srcp->sflags & SFLAT) |
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cachelen = SHADCACHE*SHADCACHE*3 + (SHADCACHE&1)*SHADCACHE*4; |
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else /* spherical distribution */ |
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cachelen = SHADCACHE*SHADCACHE*6; |
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/* allocate cache */ |
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srcp->obscache = (OBSCACHE *)malloc(sizeof(OBSCACHE) + |
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sizeof(OBJECT)*(cachelen-1)); |
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if (srcp->obscache == NULL) |
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error(SYSTEM, "out of memory in initobscache()"); |
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/* set parameters */ |
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if (srcp->sflags & SDISTANT) { |
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RREAL amax = 0; |
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for (ax1 = 3; ax1--; ) |
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if (ABS(srcp->sloc[ax1]) > amax) { |
| 86 |
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amax = ABS(srcp->sloc[ax1]); |
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ax = ax1; |
| 88 |
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} |
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srcp->obscache->p.d.ax = ax; |
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ax1 = (ax+1)%3; |
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ax2 = (ax+2)%3; |
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VCOPY(srcp->obscache->p.d.o, thescene.cuorg); |
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if (srcp->sloc[ax] > 0) |
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srcp->obscache->p.d.o[ax] += thescene.cusize; |
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if (srcp->sloc[ax1] < 0) |
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srcp->obscache->p.d.o[ax1] += thescene.cusize * |
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srcp->sloc[ax1] / amax; |
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if (srcp->sloc[ax2] < 0) |
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srcp->obscache->p.d.o[ax2] += thescene.cusize * |
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srcp->sloc[ax2] / amax; |
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srcp->obscache->p.d.e1 = 1. / (thescene.cusize*(1. + |
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fabs(srcp->sloc[ax1])/amax)); |
| 103 |
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srcp->obscache->p.d.e2 = 1. / (thescene.cusize*(1. + |
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fabs(srcp->sloc[ax2])/amax)); |
| 105 |
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} else if (srcp->sflags & SFLAT) { |
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VCOPY(srcp->obscache->p.f.u, srcp->ss[SU]); |
| 107 |
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normalize(srcp->obscache->p.f.u); |
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fcross(srcp->obscache->p.f.v, |
| 109 |
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srcp->snorm, srcp->obscache->p.f.u); |
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} |
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/* clear cache */ |
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for (i = cachelen; i--; ) |
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srcp->obscache->obs[i] = OVOID; |
| 114 |
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/* cast shadow rays */ |
| 115 |
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if (srcp->sflags & SDISTANT) { |
| 116 |
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for (k = 3; k--; ) |
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rdir[k] = -srcp->sloc[k]; |
| 118 |
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for (i = 2*SHADCACHE; i--; ) |
| 119 |
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for (j = 2*SHADCACHE; j--; ) { |
| 120 |
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VCOPY(rorg, srcp->obscache->p.d.o); |
| 121 |
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rorg[ax1] += (i+.5) / |
| 122 |
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(2*SHADCACHE*srcp->obscache->p.d.e1); |
| 123 |
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rorg[ax2] += (j+.5) / |
| 124 |
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(2*SHADCACHE*srcp->obscache->p.d.e2); |
| 125 |
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castshadow(sn, rorg, rdir); |
| 126 |
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} |
| 127 |
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} else if (srcp->sflags & SFLAT) { |
| 128 |
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d = 0.01*srcp->srad; |
| 129 |
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VSUM(rorg, srcp->sloc, srcp->snorm, d); |
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for (i = SHADCACHE; i--; ) |
| 131 |
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for (j = SHADCACHE; j--; ) { |
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d = 2./SHADCACHE*(i+.5) - 1.; |
| 133 |
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VSUM(rdir, srcp->snorm, |
| 134 |
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srcp->obscache->p.f.u, d); |
| 135 |
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d = 2./SHADCACHE*(j+.5) - 1.; |
| 136 |
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VSUM(rdir, rdir, srcp->obscache->p.f.v, d); |
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normalize(rdir); |
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castshadow(sn, rorg, rdir); |
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} |
| 140 |
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for (k = 2; k--; ) |
| 141 |
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for (i = SHADCACHE; i--; ) |
| 142 |
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for (j = SHADCACHE>>1; j--; ) { |
| 143 |
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d = 2./SHADCACHE*(i+.5) - 1.; |
| 144 |
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if (k) |
| 145 |
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VSUM(rdir, srcp->obscache->p.f.u, |
| 146 |
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srcp->obscache->p.f.v, d); |
| 147 |
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else |
| 148 |
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VSUM(rdir, srcp->obscache->p.f.v, |
| 149 |
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srcp->obscache->p.f.u, d); |
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greg |
2.3 |
d = 1. - 2./SHADCACHE*(j+.5); |
| 151 |
greg |
2.1 |
VSUM(rdir, rdir, srcp->snorm, d); |
| 152 |
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normalize(rdir); |
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castshadow(sn, rorg, rdir); |
| 154 |
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d = 2.*DOT(rdir, srcp->snorm); |
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rdir[0] = d*srcp->snorm[0] - rdir[0]; |
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rdir[1] = d*srcp->snorm[1] - rdir[1]; |
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rdir[2] = d*srcp->snorm[2] - rdir[2]; |
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castshadow(sn, rorg, rdir); |
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} |
| 160 |
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} else /* spherical distribution */ |
| 161 |
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for (k = 6; k--; ) { |
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ax = k%3; |
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ax1 = (k+1)%3; |
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ax2 = (k+2)%3; |
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for (i = SHADCACHE; i--; ) |
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for (j = SHADCACHE; j--; ) { |
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rdir[0]=rdir[1]=rdir[2] = 0.; |
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rdir[ax] = k<3 ? 1. : -1.; |
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rdir[ax1] = 2./SHADCACHE*(i+.5) - 1.; |
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rdir[ax2] = 2./SHADCACHE*(j+.5) - 1.; |
| 171 |
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normalize(rdir); |
| 172 |
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d = 1.05*srcp->srad; |
| 173 |
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VSUM(rorg, srcp->sloc, rdir, d); |
| 174 |
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castshadow(sn, rorg, rdir); |
| 175 |
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} |
| 176 |
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} |
| 177 |
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} |
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| 179 |
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| 180 |
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static OBJECT * /* return occluder cache entry */ |
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srcobstructp(register RAY *r) |
| 182 |
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{ |
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greg |
2.15 |
static RNUMBER lastrno = ~0; |
| 184 |
greg |
2.1 |
static OBJECT noobs; |
| 185 |
greg |
2.6 |
static OBJECT *lastobjp; |
| 186 |
greg |
2.1 |
SRCREC *srcp; |
| 187 |
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int ondx; |
| 188 |
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| 189 |
greg |
2.6 |
noobs = OVOID; |
| 190 |
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if (r->rno == lastrno) |
| 191 |
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return lastobjp; /* just recall last pointer */ |
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greg |
2.1 |
DCHECK(r->rsrc < 0, CONSISTENCY, |
| 193 |
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"srcobstructp() called with unaimed ray"); |
| 194 |
greg |
2.6 |
lastrno = r->rno; |
| 195 |
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lastobjp = &noobs; |
| 196 |
greg |
2.1 |
srcp = &source[r->rsrc]; |
| 197 |
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if (srcp->sflags & (SSKIP|SPROX|SSPOT|SVIRTUAL)) |
| 198 |
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return(&noobs); /* don't cache these */ |
| 199 |
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if (srcp->obscache == NULL) /* initialize cache */ |
| 200 |
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initobscache(r->rsrc); |
| 201 |
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/* compute cache index */ |
| 202 |
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if (srcp->sflags & SDISTANT) { |
| 203 |
greg |
2.17 |
int ax=0, ax1=1, ax2=2; |
| 204 |
greg |
2.1 |
double t; |
| 205 |
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ax = srcp->obscache->p.d.ax; |
| 206 |
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if ((ax1 = ax+1) >= 3) ax1 -= 3; |
| 207 |
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if ((ax2 = ax+2) >= 3) ax2 -= 3; |
| 208 |
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t = (srcp->obscache->p.d.o[ax] - r->rorg[ax]) / srcp->sloc[ax]; |
| 209 |
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if (t <= FTINY) |
| 210 |
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return(&noobs); /* could happen if ray is outside */ |
| 211 |
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ondx = 2*SHADCACHE*(int)(2*SHADCACHE*srcp->obscache->p.d.e1 * |
| 212 |
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(r->rorg[ax1] + t*srcp->sloc[ax1] - |
| 213 |
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srcp->obscache->p.d.o[ax1])); |
| 214 |
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ondx += (int)(2*SHADCACHE*srcp->obscache->p.d.e2 * |
| 215 |
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(r->rorg[ax2] + t*srcp->sloc[ax2] - |
| 216 |
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srcp->obscache->p.d.o[ax2])); |
| 217 |
schorsch |
2.4 |
if ((ondx < 0) | (ondx >= 4*SHADCACHE*SHADCACHE)) |
| 218 |
greg |
2.1 |
return(&noobs); /* could happen if ray is outside */ |
| 219 |
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} else if (srcp->sflags & SFLAT) { |
| 220 |
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FVECT sd; |
| 221 |
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RREAL sd0m, sd1m; |
| 222 |
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sd[0] = -DOT(r->rdir, srcp->obscache->p.f.u); |
| 223 |
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sd[1] = -DOT(r->rdir, srcp->obscache->p.f.v); |
| 224 |
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sd[2] = -DOT(r->rdir, srcp->snorm); |
| 225 |
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if (sd[2] < 0) |
| 226 |
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return(&noobs); /* shouldn't happen */ |
| 227 |
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sd0m = ABS(sd[0]); |
| 228 |
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sd1m = ABS(sd[1]); |
| 229 |
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if (sd[2] >= sd0m && sd[2] >= sd1m) { |
| 230 |
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ondx = SHADCACHE*(int)(SHADCACHE*(.5-FTINY) * |
| 231 |
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(1. + sd[0]/sd[2])); |
| 232 |
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ondx += (int)(SHADCACHE*(.5-FTINY) * |
| 233 |
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(1. + sd[1]/sd[2])); |
| 234 |
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} else if (sd0m >= sd1m) { |
| 235 |
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ondx = SHADCACHE*SHADCACHE; |
| 236 |
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if (sd[0] < 0) |
| 237 |
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ondx += ((SHADCACHE+1)>>1)*SHADCACHE; |
| 238 |
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ondx += SHADCACHE*(int)(SHADCACHE*(.5-FTINY) * |
| 239 |
greg |
2.3 |
(1. - sd[2]/sd0m)); |
| 240 |
greg |
2.1 |
ondx += (int)(SHADCACHE*(.5-FTINY) * |
| 241 |
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(1. + sd[1]/sd0m)); |
| 242 |
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} else /* sd1m > sd0m */ { |
| 243 |
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ondx = SHADCACHE*SHADCACHE + |
| 244 |
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((SHADCACHE+1)>>1)*SHADCACHE*2; |
| 245 |
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if (sd[1] < 0) |
| 246 |
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ondx += ((SHADCACHE+1)>>1)*SHADCACHE; |
| 247 |
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ondx += SHADCACHE*(int)(SHADCACHE*(.5-FTINY) * |
| 248 |
greg |
2.3 |
(1. - sd[2]/sd1m)); |
| 249 |
greg |
2.1 |
ondx += (int)(SHADCACHE*(.5-FTINY) * |
| 250 |
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(1. + sd[0]/sd1m)); |
| 251 |
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} |
| 252 |
greg |
2.6 |
DCHECK((ondx < 0) | (ondx >= SHADCACHE*SHADCACHE*3 + |
| 253 |
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(SHADCACHE&1)*SHADCACHE*4), CONSISTENCY, |
| 254 |
greg |
2.3 |
"flat source cache index out of bounds"); |
| 255 |
greg |
2.1 |
} else /* spherical distribution */ { |
| 256 |
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int ax, ax1, ax2; |
| 257 |
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RREAL amax = 0; |
| 258 |
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for (ax1 = 3; ax1--; ) |
| 259 |
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if (ABS(r->rdir[ax1]) > amax) { |
| 260 |
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amax = ABS(r->rdir[ax1]); |
| 261 |
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ax = ax1; |
| 262 |
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} |
| 263 |
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if ((ax1 = ax+1) >= 3) ax1 -= 3; |
| 264 |
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if ((ax2 = ax+2) >= 3) ax2 -= 3; |
| 265 |
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ondx = 2*SHADCACHE*SHADCACHE * ax; |
| 266 |
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if (r->rdir[ax] < 0) |
| 267 |
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ondx += SHADCACHE*SHADCACHE; |
| 268 |
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ondx += SHADCACHE*(int)(SHADCACHE*(.5-FTINY) * |
| 269 |
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(1. + r->rdir[ax1]/amax)); |
| 270 |
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ondx += (int)(SHADCACHE*(.5-FTINY) * |
| 271 |
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(1. + r->rdir[ax2]/amax)); |
| 272 |
greg |
2.6 |
DCHECK((ondx < 0) | (ondx >= SHADCACHE*SHADCACHE*6), CONSISTENCY, |
| 273 |
greg |
2.3 |
"radial source cache index out of bounds"); |
| 274 |
greg |
2.1 |
} |
| 275 |
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/* return cache pointer */ |
| 276 |
greg |
2.6 |
return(lastobjp = &srcp->obscache->obs[ondx]); |
| 277 |
greg |
2.1 |
} |
| 278 |
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| 279 |
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| 280 |
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void /* free obstruction cache */ |
| 281 |
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freeobscache(SRCREC *srcp) |
| 282 |
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{ |
| 283 |
|
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if (srcp->obscache == NULL) |
| 284 |
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return; |
| 285 |
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free((void *)srcp->obscache); |
| 286 |
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srcp->obscache = NULL; |
| 287 |
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} |
| 288 |
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| 289 |
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| 290 |
greg |
2.7 |
int /* record a source blocker */ |
| 291 |
greg |
2.1 |
srcblocker(register RAY *r) |
| 292 |
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{ |
| 293 |
|
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OBJREC *m; |
| 294 |
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| 295 |
|
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if (r->robj == OVOID || objptr(r->robj) != r->ro || |
| 296 |
|
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isvolume(r->ro->otype)) |
| 297 |
greg |
2.7 |
return(0); /* don't record complex blockers */ |
| 298 |
greg |
2.11 |
if (r->rsrc < 0 || source[r->rsrc].so == r->ro) |
| 299 |
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return(0); /* just a mistake, that's all */ |
| 300 |
greg |
2.13 |
if (antimodlist != NULL && inset(antimodlist, r->ro->omod)) |
| 301 |
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return(0); /* could be clipped */ |
| 302 |
greg |
2.1 |
m = findmaterial(r->ro); |
| 303 |
|
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if (m == NULL) |
| 304 |
greg |
2.7 |
return(0); /* no material?! */ |
| 305 |
greg |
2.5 |
if (!isopaque(m->otype)) |
| 306 |
greg |
2.7 |
return(0); /* material not a reliable blocker */ |
| 307 |
greg |
2.1 |
*srcobstructp(r) = r->robj; /* else record obstructor */ |
| 308 |
greg |
2.7 |
return(1); |
| 309 |
greg |
2.1 |
} |
| 310 |
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| 311 |
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| 312 |
|
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int /* check ray against cached blocker */ |
| 313 |
|
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srcblocked(RAY *r) |
| 314 |
|
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{ |
| 315 |
|
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OBJECT obs = *srcobstructp(r); |
| 316 |
|
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OBJREC *op; |
| 317 |
|
|
|
| 318 |
|
|
if (obs == OVOID) |
| 319 |
|
|
return(0); |
| 320 |
greg |
2.10 |
op = objptr(obs); /* check blocker intersection */ |
| 321 |
greg |
2.9 |
if (!(*ofun[op->otype].funp)(op, r)) |
| 322 |
|
|
return(0); |
| 323 |
greg |
2.10 |
if (source[r->rsrc].sflags & SDISTANT) |
| 324 |
|
|
return(1); |
| 325 |
|
|
op = source[r->rsrc].so; /* check source intersection */ |
| 326 |
|
|
if (!(*ofun[op->otype].funp)(op, r)) |
| 327 |
|
|
return(1); |
| 328 |
|
|
rayclear(r); |
| 329 |
|
|
return(0); /* source in front */ |
| 330 |
greg |
2.1 |
} |
| 331 |
|
|
|
| 332 |
|
|
|
| 333 |
greg |
2.13 |
void /* record potentially clipped materials */ |
| 334 |
|
|
markclip(OBJREC *m) |
| 335 |
|
|
{ |
| 336 |
|
|
OBJECT *set2add, *oldset; |
| 337 |
|
|
|
| 338 |
greg |
2.16 |
if (m == NULL) { /* starting over */ |
| 339 |
|
|
if (antimodlist != NULL) |
| 340 |
|
|
free((void *)antimodlist); |
| 341 |
|
|
antimodlist = NULL; |
| 342 |
|
|
return; |
| 343 |
|
|
} |
| 344 |
greg |
2.13 |
m_clip(m, NULL); /* initialize modifier list */ |
| 345 |
|
|
if ((set2add = (OBJECT *)m->os) == NULL || !set2add[0]) |
| 346 |
|
|
return; |
| 347 |
|
|
|
| 348 |
|
|
if (antimodlist == NULL) { /* start of list */ |
| 349 |
|
|
antimodlist = setsave(set2add); |
| 350 |
|
|
return; |
| 351 |
|
|
} |
| 352 |
|
|
/* else add to previous list */ |
| 353 |
|
|
oldset = antimodlist; |
| 354 |
|
|
antimodlist = (OBJECT *)malloc((oldset[0]+set2add[0]+1)*sizeof(OBJECT)); |
| 355 |
|
|
if (antimodlist == NULL) |
| 356 |
|
|
error(SYSTEM, "out of memory in markclip"); |
| 357 |
|
|
setunion(antimodlist, oldset, set2add); |
| 358 |
|
|
free((void *)oldset); |
| 359 |
|
|
} |
| 360 |
|
|
|
| 361 |
|
|
|
| 362 |
|
|
#else /* SHADCACHE */ |
| 363 |
|
|
|
| 364 |
|
|
|
| 365 |
|
|
void /* no-op also avoids linker warning */ |
| 366 |
|
|
markclip(OBJREC *m) |
| 367 |
|
|
{ |
| 368 |
|
|
(void)m; |
| 369 |
|
|
} |
| 370 |
|
|
|
| 371 |
|
|
|
| 372 |
greg |
2.1 |
#endif /* SHADCACHE */ |
