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/* Copyright (c) 1996 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* Draw small sources into image in case we missed them. |
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* |
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* External symbols declared in ray.h |
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*/ |
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#include "ray.h" |
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#include "copyright.h" |
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#include "ray.h" |
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#include "view.h" |
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#include "otypes.h" |
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#include "source.h" |
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#define MAXVERT 10 |
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typedef struct splist { |
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struct splist *next; /* next source in list */ |
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int sn; /* source number */ |
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short nv; /* number of vertices */ |
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RREAL vl[3][2]; /* vertex array (last) */ |
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} SPLIST; /* source polygon list */ |
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extern VIEW ourview; /* our view parameters */ |
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extern int hres, vres; /* our image resolution */ |
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static SPLIST *sphead = NULL; /* our list of source polys */ |
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|
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static int inregion(RREAL p[2], double cv, int crit); |
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static void clipregion(RREAL a[2], RREAL b[2], double cv, int crit, RREAL r[2]); |
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static int hp_clip_poly(RREAL vl[][2], int nv, double cv, int crit, |
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RREAL vlo[][2]); |
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static int box_clip_poly(RREAL vl[MAXVERT][2], int nv, |
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double xl, double xr, double yb, double ya, RREAL vlo[MAXVERT][2]); |
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static double minw2(RREAL vl[][2], int nv, double ar2); |
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static void convex_center(RREAL vl[][2], int nv, RREAL cv[2]); |
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static double poly_area(RREAL vl[][2], int nv); |
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static int convex_hull(RREAL vl[][2], int nv, RREAL vlo[][2]); |
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static void spinsert(int sn, RREAL vl[][2], int nv); |
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static int sourcepoly(int sn, RREAL sp[MAXVERT][2]); |
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static int |
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inregion(p, cv, crit) /* check if vertex is in region */ |
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FLOAT p[2]; |
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double cv; |
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int crit; |
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inregion( /* check if vertex is in region */ |
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RREAL p[2], |
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double cv, |
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int crit |
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) |
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{ |
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switch (crit) { |
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case CLIP_ABOVE: |
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} |
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static |
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clipregion(a, b, cv, crit, r) /* find intersection with boundary */ |
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register FLOAT a[2], b[2]; |
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double cv; |
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int crit; |
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FLOAT r[2]; /* return value */ |
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static void |
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clipregion( /* find intersection with boundary */ |
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register RREAL a[2], |
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register RREAL b[2], |
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double cv, |
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int crit, |
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RREAL r[2] /* return value */ |
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) |
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{ |
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switch (crit) { |
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case CLIP_ABOVE: |
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static int |
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hp_clip_poly(vl, nv, cv, crit, vlo) /* clip polygon to half-plane */ |
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FLOAT vl[][2]; |
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int nv; |
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double cv; |
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int crit; |
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FLOAT vlo[][2]; /* return value */ |
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hp_clip_poly( /* clip polygon to half-plane */ |
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RREAL vl[][2], |
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int nv, |
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double cv, |
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int crit, |
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RREAL vlo[][2] /* return value */ |
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) |
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{ |
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FLOAT *s, *p; |
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RREAL *s, *p; |
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register int j, nvo; |
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s = vl[nv-1]; |
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static int |
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box_clip_poly(vl, nv, xl, xr, yb, ya, vlo) /* clip polygon to box */ |
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FLOAT vl[MAXVERT][2]; |
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int nv; |
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double xl, xr, yb, ya; |
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FLOAT vlo[MAXVERT][2]; /* return value */ |
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box_clip_poly( /* clip polygon to box */ |
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RREAL vl[MAXVERT][2], |
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int nv, |
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double xl, |
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double xr, |
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double yb, |
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double ya, |
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RREAL vlo[MAXVERT][2] /* return value */ |
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) |
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{ |
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FLOAT vlt[MAXVERT][2]; |
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RREAL vlt[MAXVERT][2]; |
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int nvt, nvo; |
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nvt = hp_clip_poly(vl, nv, yb, CLIP_BELOW, vlt); |
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static double |
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minw2(vl, nv, ar2) /* compute square of minimum width */ |
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FLOAT vl[][2]; |
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int nv; |
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double ar2; |
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minw2( /* compute square of minimum width */ |
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RREAL vl[][2], |
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int nv, |
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double ar2 |
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) |
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{ |
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double d2, w2, w2min, w2max; |
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register FLOAT *p0, *p1, *p2; |
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register RREAL *p0, *p1, *p2; |
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int i, j; |
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/* find minimum for all widths */ |
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w2min = FHUGE; |
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} |
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static |
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convex_center(vl, nv, cv) /* compute center of convex polygon */ |
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register FLOAT vl[][2]; |
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int nv; |
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FLOAT cv[2]; /* return value */ |
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static void |
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convex_center( /* compute center of convex polygon */ |
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register RREAL vl[][2], |
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int nv, |
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RREAL cv[2] /* return value */ |
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) |
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{ |
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register int i; |
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/* simple average (suboptimal) */ |
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static double |
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poly_area(vl, nv) /* compute area of polygon */ |
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register FLOAT vl[][2]; |
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int nv; |
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poly_area( /* compute area of polygon */ |
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register RREAL vl[][2], |
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int nv |
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) |
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{ |
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double a; |
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FLOAT v0[2], v1[2]; |
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RREAL v0[2], v1[2]; |
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register int i; |
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a = 0.; |
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static int |
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convex_hull(vl, nv, vlo) /* compute polygon's convex hull */ |
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FLOAT vl[][2]; |
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int nv; |
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FLOAT vlo[][2]; /* return value */ |
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convex_hull( /* compute polygon's convex hull */ |
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RREAL vl[][2], |
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int nv, |
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RREAL vlo[][2] /* return value */ |
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) |
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{ |
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int nvo, nvt; |
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FLOAT vlt[MAXVERT][2]; |
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RREAL vlt[MAXVERT][2]; |
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double voa, vta; |
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register int i, j; |
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/* start with original polygon */ |
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} |
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int |
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sourcepoly(vw, sn, sp) /* compute image polygon for source */ |
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VIEW *vw; |
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int sn; |
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FLOAT sp[MAXVERT][2]; |
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static void |
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spinsert( /* insert new source polygon */ |
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int sn, |
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RREAL vl[][2], |
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int nv |
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) |
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{ |
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static char cubeord[8][6] = {{1,3,2,6,4,5},{0,4,5,7,3,2}, |
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register SPLIST *spn; |
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register int i; |
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|
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if (nv < 3) |
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return; |
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if (nv > 3) |
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spn = (SPLIST *)malloc(sizeof(SPLIST)+sizeof(RREAL)*2*(nv-3)); |
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else |
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spn = (SPLIST *)malloc(sizeof(SPLIST)); |
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if (spn == NULL) |
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error(SYSTEM, "out of memory in spinsert"); |
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spn->sn = sn; |
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for (i = spn->nv = nv; i--; ) { |
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spn->vl[i][0] = vl[i][0]; spn->vl[i][1] = vl[i][1]; |
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} |
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spn->next = sphead; /* push onto global list */ |
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sphead = spn; |
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} |
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static int |
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sourcepoly( /* compute image polygon for source */ |
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int sn, |
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RREAL sp[MAXVERT][2] |
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) |
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{ |
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static short cubeord[8][6] = {{1,3,2,6,4,5},{0,4,5,7,3,2}, |
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{0,1,3,7,6,4},{0,1,5,7,6,2}, |
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{0,2,6,7,5,1},{0,4,6,7,3,1}, |
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{0,2,3,7,5,4},{1,5,4,6,2,3}}; |
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register SRCREC *s = source + sn; |
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FVECT ap, ip; |
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FLOAT pt[6][2]; |
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RREAL pt[6][2]; |
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int dir; |
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register int i, j; |
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if (s->sflags & (SDISTANT|SFLAT)) { |
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if (s->sflags & SDISTANT && vw->type == VT_PAR) |
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return(0); /* all or nothing case */ |
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if (s->sflags & SDISTANT) { |
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if (ourview.type == VT_PAR) |
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return(0); /* all or nothing case */ |
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if (s->srad >= 0.05) |
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return(0); /* should never be a problem */ |
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} |
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if (s->sflags & SFLAT) { |
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for (i = 0; i < 3; i++) |
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ap[i] = s->sloc[i] - vw->vp[i]; |
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ap[i] = s->sloc[i] - ourview.vp[i]; |
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if (DOT(ap, s->snorm) >= 0.) |
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return(0); /* source faces away */ |
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} |
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for (j = 0; j < 4; j++) { /* four corners */ |
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for (i = 0; i < 3; i++) { |
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ap[i] = s->sloc[i]; |
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if (j==1|j==2) ap[i] += s->ss[SU][i]; |
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if ((j==1)|(j==2)) ap[i] += s->ss[SU][i]; |
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else ap[i] -= s->ss[SU][i]; |
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if (j==2|j==3) ap[i] += s->ss[SV][i]; |
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if ((j==2)|(j==3)) ap[i] += s->ss[SV][i]; |
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else ap[i] -= s->ss[SV][i]; |
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if (s->sflags & SDISTANT) { |
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ap[i] *= 1. + vw->vfore; |
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ap[i] += vw->vp[i]; |
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ap[i] *= 1. + ourview.vfore; |
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ap[i] += ourview.vp[i]; |
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} |
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} |
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viewloc(ip, vw, ap); /* find image point */ |
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viewloc(ip, &ourview, ap); /* find image point */ |
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if (ip[2] <= 0.) |
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return(0); /* in front of view */ |
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sp[j][0] = ip[0]; sp[j][1] = ip[1]; |
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} |
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/* identify furthest corner */ |
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for (i = 0; i < 3; i++) |
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ap[i] = s->sloc[i] - vw->vp[i]; |
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ap[i] = s->sloc[i] - ourview.vp[i]; |
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dir = (DOT(ap,s->ss[SU])>0.) | |
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(DOT(ap,s->ss[SV])>0.)<<1 | |
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(DOT(ap,s->ss[SW])>0.)<<2 ; |
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if (cubeord[dir][j] & 4) ap[i] += s->ss[SW][i]; |
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else ap[i] -= s->ss[SW][i]; |
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} |
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viewloc(ip, vw, ap); /* find image point */ |
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viewloc(ip, &ourview, ap); /* find image point */ |
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if (ip[2] <= 0.) |
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return(0); /* in front of view */ |
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pt[j][0] = ip[0]; pt[j][1] = ip[1]; |
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} |
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/* add sources smaller than rad to computed subimage */ |
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drawsources(vw, xr, yr, pic, zbf, x0, xsiz, y0, ysiz, rad) |
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VIEW *vw; /* full image view */ |
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< |
int xr, yr; /* full image dimensions */ |
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< |
COLOR *pic[]; /* subimage pixel value array */ |
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float *zbf[]; /* subimage distance array (opt.) */ |
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< |
int x0, xsiz, y0, ysiz; /* origin and size of subimage */ |
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int rad; /* source sample size */ |
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/* initialize by finding sources smaller than rad */ |
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> |
extern void |
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> |
init_drawsources( |
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> |
int rad /* source sample size */ |
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> |
) |
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{ |
| 366 |
< |
int sn; |
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< |
FLOAT spoly[MAXVERT][2], ppoly[MAXVERT][2]; |
| 368 |
< |
int nsv, npv; |
| 369 |
< |
int xmin, xmax, ymin, ymax, x, y, i; |
| 370 |
< |
FLOAT cxy[2]; |
| 371 |
< |
double pa; |
| 372 |
< |
RAY sr; |
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> |
RREAL spoly[MAXVERT][2]; |
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> |
int nsv; |
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> |
register SPLIST *sp; |
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> |
register int i; |
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> |
/* free old source list if one */ |
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> |
for (sp = sphead; sp != NULL; sp = sphead) { |
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> |
sphead = sp->next; |
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> |
free((void *)sp); |
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> |
} |
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/* loop through all sources */ |
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< |
for (sn = 0; sn < nsources; sn++) { |
| 376 |
> |
for (i = nsources; i--; ) { |
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> |
/* skip illum's */ |
| 378 |
> |
if (findmaterial(source[i].so)->otype == MAT_ILLUM) |
| 379 |
> |
continue; |
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/* compute image polygon for source */ |
| 381 |
< |
if (!(nsv = sourcepoly(vw, sn, spoly))) |
| 381 |
> |
if (!(nsv = sourcepoly(i, spoly))) |
| 382 |
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continue; |
| 383 |
+ |
/* clip to image boundaries */ |
| 384 |
+ |
if (!(nsv = box_clip_poly(spoly, nsv, 0., 1., 0., 1., spoly))) |
| 385 |
+ |
continue; |
| 386 |
+ |
/* big enough for standard sampling? */ |
| 387 |
+ |
if (minw2(spoly, nsv, ourview.vn2/ourview.hn2) > |
| 388 |
+ |
(double)rad*rad/hres/hres) |
| 389 |
+ |
continue; |
| 390 |
+ |
/* OK, add to our list */ |
| 391 |
+ |
spinsert(i, spoly, nsv); |
| 392 |
+ |
} |
| 393 |
+ |
} |
| 394 |
+ |
|
| 395 |
+ |
extern void /* add sources smaller than rad to computed subimage */ |
| 396 |
+ |
drawsources( |
| 397 |
+ |
COLOR *pic[], /* subimage pixel value array */ |
| 398 |
+ |
float *zbf[], /* subimage distance array (opt.) */ |
| 399 |
+ |
int x0, /* origin and size of subimage */ |
| 400 |
+ |
int xsiz, |
| 401 |
+ |
int y0, |
| 402 |
+ |
int ysiz |
| 403 |
+ |
) |
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+ |
{ |
| 405 |
+ |
RREAL spoly[MAXVERT][2], ppoly[MAXVERT][2]; |
| 406 |
+ |
int nsv, npv; |
| 407 |
+ |
int xmin, xmax, ymin, ymax, x, y; |
| 408 |
+ |
RREAL cxy[2]; |
| 409 |
+ |
double w; |
| 410 |
+ |
RAY sr; |
| 411 |
+ |
register SPLIST *sp; |
| 412 |
+ |
register int i; |
| 413 |
+ |
/* check each source in our list */ |
| 414 |
+ |
for (sp = sphead; sp != NULL; sp = sp->next) { |
| 415 |
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/* clip source poly to subimage */ |
| 416 |
< |
nsv = box_clip_poly(spoly, nsv, |
| 417 |
< |
(double)x0/xr, (double)(x0+xsiz)/xr, |
| 418 |
< |
(double)y0/yr, (double)(y0+ysiz)/yr, spoly); |
| 416 |
> |
nsv = box_clip_poly(sp->vl, sp->nv, |
| 417 |
> |
(double)x0/hres, (double)(x0+xsiz)/hres, |
| 418 |
> |
(double)y0/vres, (double)(y0+ysiz)/vres, spoly); |
| 419 |
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if (!nsv) |
| 420 |
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continue; |
| 320 |
– |
/* is it big so sampling found it? */ |
| 321 |
– |
if (minw2(spoly, nsv, vw->vn2/vw->hn2) > (double)rad*rad/xr/xr) |
| 322 |
– |
continue; |
| 421 |
|
/* find common subimage (BBox) */ |
| 422 |
|
xmin = x0 + xsiz; xmax = x0; |
| 423 |
|
ymin = y0 + ysiz; ymax = y0; |
| 424 |
|
for (i = 0; i < nsv; i++) { |
| 425 |
< |
if ((double)xmin/xr > spoly[i][0]) |
| 426 |
< |
xmin = spoly[i][0]*xr + FTINY; |
| 427 |
< |
if ((double)xmax/xr < spoly[i][0]) |
| 428 |
< |
xmax = spoly[i][0]*xr - FTINY; |
| 429 |
< |
if ((double)ymin/yr > spoly[i][1]) |
| 430 |
< |
ymin = spoly[i][1]*yr + FTINY; |
| 431 |
< |
if ((double)ymax/yr < spoly[i][1]) |
| 432 |
< |
ymax = spoly[i][1]*yr - FTINY; |
| 425 |
> |
if ((double)xmin/hres > spoly[i][0]) |
| 426 |
> |
xmin = spoly[i][0]*hres + FTINY; |
| 427 |
> |
if ((double)xmax/hres < spoly[i][0]) |
| 428 |
> |
xmax = spoly[i][0]*hres - FTINY; |
| 429 |
> |
if ((double)ymin/vres > spoly[i][1]) |
| 430 |
> |
ymin = spoly[i][1]*vres + FTINY; |
| 431 |
> |
if ((double)ymax/vres < spoly[i][1]) |
| 432 |
> |
ymax = spoly[i][1]*vres - FTINY; |
| 433 |
|
} |
| 434 |
|
/* evaluate each pixel in BBox */ |
| 435 |
|
for (y = ymin; y <= ymax; y++) |
| 436 |
|
for (x = xmin; x <= xmax; x++) { |
| 437 |
|
/* subarea for pixel */ |
| 438 |
|
npv = box_clip_poly(spoly, nsv, |
| 439 |
< |
(double)x/xr, (x+1.)/xr, |
| 440 |
< |
(double)y/yr, (y+1.)/yr, ppoly); |
| 439 |
> |
(double)x/hres, (x+1.)/hres, |
| 440 |
> |
(double)y/vres, (y+1.)/vres, |
| 441 |
> |
ppoly); |
| 442 |
|
if (!npv) |
| 443 |
|
continue; /* no overlap */ |
| 444 |
|
convex_center(ppoly, npv, cxy); |
| 445 |
< |
if ((sr.rmax = viewray(sr.rorg, sr.rdir, vw, |
| 446 |
< |
cxy[0], cxy[1])) < -FTINY) |
| 445 |
> |
if ((sr.rmax = viewray(sr.rorg,sr.rdir,&ourview, |
| 446 |
> |
cxy[0],cxy[1])) < -FTINY) |
| 447 |
|
continue; /* not in view */ |
| 448 |
< |
if (source[sn].sflags & SSPOT && |
| 449 |
< |
spotout(sr, source[sn].sl.s)) |
| 448 |
> |
if (source[sp->sn].sflags & SSPOT && |
| 449 |
> |
spotout(&sr, source[sp->sn].sl.s)) |
| 450 |
|
continue; /* outside spot */ |
| 451 |
|
rayorigin(&sr, NULL, SHADOW, 1.0); |
| 452 |
< |
sr.rsrc = sn; |
| 452 |
> |
sr.rsrc = sp->sn; |
| 453 |
|
rayvalue(&sr); /* compute value */ |
| 454 |
|
if (bright(sr.rcol) <= FTINY) |
| 455 |
|
continue; /* missed/blocked */ |
| 456 |
|
/* modify pixel */ |
| 457 |
+ |
w = poly_area(ppoly, npv) * hres * vres; |
| 458 |
|
if (zbf[y-y0] != NULL && |
| 459 |
< |
sr.rt < zbf[y-y0][x-x0]) |
| 459 |
> |
sr.rt < 0.99*zbf[y-y0][x-x0]) { |
| 460 |
|
zbf[y-y0][x-x0] = sr.rt; |
| 461 |
< |
pa = poly_area(ppoly, npv); |
| 462 |
< |
scalecolor(sr.rcol, pa*xr*yr); |
| 463 |
< |
scalecolor(pic[y-y0][x-x0], (1.-pa*xr*yr)); |
| 461 |
> |
} else if (!bigdiff(sr.rcol, pic[y-y0][x-x0], |
| 462 |
> |
0.01)) { /* source sample */ |
| 463 |
> |
scalecolor(pic[y-y0][x-x0], w); |
| 464 |
> |
continue; |
| 465 |
> |
} |
| 466 |
> |
scalecolor(sr.rcol, w); |
| 467 |
> |
scalecolor(pic[y-y0][x-x0], 1.-w); |
| 468 |
|
addcolor(pic[y-y0][x-x0], sr.rcol); |
| 469 |
|
} |
| 470 |
|
} |
