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/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
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|
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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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/* |
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* Quadtree display support routines for cone output. |
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*/ |
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|
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#include "standard.h" |
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#include "rhd_qtree.h" |
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|
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|
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static |
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redraw(tp, x0, y0, x1, y1, l) /* mark portion of a tree for redraw */ |
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register RTREE *tp; |
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int x0, y0, x1, y1; |
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int l[2][2]; |
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{ |
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int quads = CH_ANY; |
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int mx, my; |
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register int i; |
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/* compute midpoint */ |
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mx = (x0 + x1) >> 1; |
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my = (y0 + y1) >> 1; |
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/* see what to do */ |
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if (l[0][0] > mx) |
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quads &= ~(CHF(UL)|CHF(DL)); |
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else if (l[0][1] < mx) |
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quads &= ~(CHF(UR)|CHF(DR)); |
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if (l[1][0] > my) |
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quads &= ~(CHF(DR)|CHF(DL)); |
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else if (l[1][1] < my) |
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quads &= ~(CHF(UR)|CHF(UL)); |
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tp->flgs |= quads; /* mark quadrants for update */ |
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/* climb the branches */ |
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for (i = 0; i < 4; i++) |
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if (tp->flgs & BRF(i) && quads & CHF(i)) |
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redraw(tp->k[i].b, i&01 ? mx : x0, i&02 ? my : y0, |
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i&01 ? x1 : mx, i&02 ? y1 : my, l); |
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} |
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|
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|
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static |
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cpaint(rgb, p, x0, y0, x1, y1) /* paint a cone within a rectangle */ |
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BYTE rgb[3]; |
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register float *p; |
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int x0, y0, x1, y1; |
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{ |
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static FVECT ip, wp; |
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double rad; |
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/* compute base radius */ |
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rad = (double)(y1 - y0 + x1 - x0)/(odev.hres + odev.vres); |
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/* approximate apex pos? */ |
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if (p == NULL || y1-y0 <= qtMinNodesiz || x1-x0 <= qtMinNodesiz) { |
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ip[0] = (double)(x0 + x1)/(odev.hres<<1); |
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ip[1] = (double)(y0 + y1)/(odev.vres<<1); |
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if (p != NULL) { |
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wp[0] = p[0] - odev.v.vp[0]; |
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wp[1] = p[1] - odev.v.vp[1]; |
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wp[2] = p[2] - odev.v.vp[2]; |
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if (odev.v.type == VT_PER) |
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ip[2] = DOT(wp,odev.v.vdir); |
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else |
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ip[2] = VLEN(wp); |
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} else |
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ip[2] = FHUGE; |
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} else if (odev.v.type == VT_PER) { /* special case (faster) */ |
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wp[0] = p[0] - odev.v.vp[0]; |
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wp[1] = p[1] - odev.v.vp[1]; |
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wp[2] = p[2] - odev.v.vp[2]; |
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ip[2] = DOT(wp,odev.v.vdir); |
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ip[0] = DOT(wp,odev.v.hvec)/(ip[2]*odev.v.hn2) + |
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0.5 - odev.v.hoff; |
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ip[1] = DOT(wp,odev.v.vvec)/(ip[2]*odev.v.vn2) + |
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0.5 - odev.v.voff; |
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} else { /* general case */ |
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VCOPY(wp, p); |
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viewloc(ip, &odev.v, wp); |
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} |
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dev_cone(rgb, ip, rad); |
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} |
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|
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|
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static |
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update(ca, tp, x0, y0, x1, y1) /* update tree display as needed */ |
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BYTE ca[3]; /* returned average color */ |
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register RTREE *tp; |
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int x0, y0, x1, y1; |
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{ |
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int csm[3], nc; |
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register BYTE *cp; |
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BYTE rgb[3]; |
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int gaps = 0; |
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int mx, my; |
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register int i; |
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/* compute midpoint */ |
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mx = (x0 + x1) >> 1; |
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my = (y0 + y1) >> 1; |
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/* draw leaves */ |
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csm[0] = csm[1] = csm[2] = nc = 0; |
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for (i = 0; i < 4; i++) { |
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if (tp->flgs & LFF(i)) { |
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cp = qtL.rgb[tp->k[i].li]; |
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csm[0] += cp[0]; csm[1] += cp[1]; csm[2] += cp[2]; |
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nc++; |
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if (tp->flgs & CHF(i)) |
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cpaint(cp, qtL.wp[tp->k[i].li], |
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i&01 ? mx : x0, i&02 ? my : y0, |
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i&01 ? x1 : mx, i&02 ? y1 : my); |
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} else if ((tp->flgs & CHBRF(i)) == CHF(i)) |
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gaps |= 1<<i; /* empty stem */ |
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} |
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/* do branches */ |
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for (i = 0; i < 4; i++) |
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if ((tp->flgs & CHBRF(i)) == CHBRF(i)) { |
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update(rgb, tp->k[i].b, i&01 ? mx : x0, i&02 ? my : y0, |
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i&01 ? x1 : mx, i&02 ? y1 : my); |
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csm[0] += rgb[0]; csm[1] += rgb[1]; csm[2] += rgb[2]; |
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nc++; |
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} |
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if (nc > 1) { |
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ca[0] = csm[0]/nc; ca[1] = csm[1]/nc; ca[2] = csm[2]/nc; |
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} else { |
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ca[0] = csm[0]; ca[1] = csm[1]; ca[2] = csm[2]; |
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} |
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/* fill in gaps with average */ |
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for (i = 0; gaps && i < 4; gaps >>= 1, i++) |
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if (gaps & 01) |
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cpaint(ca, (float *)NULL, |
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i&01 ? mx : x0, i&02 ? my : y0, |
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i&01 ? x1 : mx, i&02 ? y1 : my); |
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tp->flgs &= ~CH_ANY; /* all done */ |
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} |
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|
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|
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qtRedraw(x0, y0, x1, y1) /* redraw part or all of our screen */ |
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int x0, y0, x1, y1; |
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{ |
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int lim[2][2]; |
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|
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if (is_stump(&qtrunk)) |
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return; |
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if (!qtMapLeaves((lim[0][0]=x0) <= 0 & (lim[1][0]=y0) <= 0 & |
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(lim[0][1]=x1) >= odev.hres-1 & (lim[1][1]=y1) >= odev.vres-1)) |
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return; |
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redraw(&qtrunk, 0, 0, odev.hres, odev.vres, lim); |
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} |
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|
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|
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qtUpdate() /* update our tree display */ |
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{ |
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BYTE ca[3]; |
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|
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if (is_stump(&qtrunk)) |
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return; |
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if (!qtMapLeaves(0)) |
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return; |
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update(ca, &qtrunk, 0, 0, odev.hres, odev.vres); |
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} |
