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gwlarson |
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/* Copyright (c) 1999 Silicon Graphics, Inc. */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ SGI"; |
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#endif |
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/* |
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* Rendering routines for rhpict. |
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*/ |
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#include "holo.h" |
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#include "view.h" |
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extern VIEW myview; /* current output view */ |
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extern COLOR *mypixel; /* pixels being rendered */ |
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extern float *myweight; /* weights (used to compute final pixels) */ |
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extern int hres, vres; /* current horizontal and vertical res. */ |
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render_beam(bp, hb) /* render a particular beam */ |
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BEAM *bp; |
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register HDBEAMI *hb; |
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{ |
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GCOORD gc[2]; |
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register RAYVAL *rv; |
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FVECT rorg, rdir, wp, ip; |
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double d, prox; |
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COLOR col; |
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int n, p; |
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if (!hdbcoord(gc, hb->h, hb->b)) |
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error(CONSISTENCY, "bad beam in render_beam"); |
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for (n = bp->nrm, rv = hdbray(bp); n--; rv++) { |
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/* reproject each sample */ |
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hdray(rorg, rdir, hb->h, gc, rv->r); |
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if (rv->d < DCINF) { |
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d = hddepth(hb->h, rv->d); |
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VSUM(wp, rorg, rdir, d); |
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VSUB(ip, wp, myview.vp); |
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d = DOT(ip,rdir); |
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prox = 1. - d*d/DOT(ip,ip); /* sin(diff_angle)^2 */ |
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} else { |
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if (myview.type == VT_PAR || myview.vaft > FTINY) |
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continue; /* inf. off view */ |
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VSUM(wp, myview.vp, rdir, FHUGE); |
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prox = 0.; |
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} |
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viewloc(ip, &myview, wp); /* frustum clipping */ |
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if (ip[2] < 0.) |
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continue; |
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if (ip[0] < 0. || ip[0] >= 1.) |
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continue; |
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if (ip[1] < 0. || ip[1] >= 1.) |
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continue; |
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if (myview.vaft > FTINY && ip[2] > myview.vaft - myview.vfore) |
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continue; |
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/* we're in! */ |
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p = (int)(ip[1]*vres)*hres + (int)(ip[0]*hres); |
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colr_color(col, rv->v); |
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addcolor(mypixel[p], col); |
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myweight[p] += 1.0; |
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} |
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} |
