--- ray/src/hd/rhd_qtree.c	1997/12/30 17:08:37	3.15
+++ ray/src/hd/rhd_qtree.c	2003/02/22 02:07:24	3.19
@@ -1,9 +1,6 @@
-/* Copyright (c) 1997 Silicon Graphics, Inc. */
-
 #ifndef lint
-static char SCCSid[] = "$SunId$ SGI";
+static const char	RCSid[] = "$Id: rhd_qtree.c,v 3.19 2003/02/22 02:07:24 greg Exp $";
 #endif
-
 /*
  * Quadtree driver support routines.
  */
@@ -29,6 +26,8 @@ double	qtDepthEps = .05;	/* epsilon to compare depths 
 int	qtMinNodesiz = 2;	/* minimum node dimension (pixels) */
 struct rleaves	qtL;		/* our pile of leaves */
 
+int	rayqleft = 0;		/* rays left to queue before flush */
+
 static int4	falleaves;	/* our list of fallen leaves */
 
 #define composted(li)	(qtL.bl <= qtL.tl ? \
@@ -87,8 +86,8 @@ int	really;
 	}
 				/* else "really" means free up memory */
 	for (i = 0; twigbundle[i] != NULL; i++)
-		free((char *)twigbundle[i]);
-	free((char *)twigbundle);
+		free((void *)twigbundle[i]);
+	free((void *)twigbundle);
 	twigbundle = NULL;
 }
 
@@ -318,41 +317,51 @@ int	drop;
 		tp->k[q].li = lo;
 	}
 dropit:
-	if (drop) {
-		qtL.chr[li][0] = qtL.chr[li][1] = qtL.chr[li][2] = 0;
-		qtL.wd[li] = falleaves;
-		falleaves = li;
-	}
+	if (drop)
+		if (li+1 == (qtL.tl ? qtL.tl : qtL.nl))
+			qtL.tl = li;		/* special case */
+		else {
+			qtL.chr[li][0] = qtL.chr[li][1] = qtL.chr[li][2] = 0;
+			qtL.wd[li] = falleaves;
+			falleaves = li;
+		}
 	return(li == lo);
 }
 
 
-dev_value(c, p, v)		/* add a pixel value to our quadtree */
+dev_value(c, d, p)		/* add a pixel value to our quadtree */
 COLR	c;
-FVECT	p, v;
+FVECT	d, p;
 {
 	register int	li;
 	int	mapit;
 				/* grab a leaf */
-	if (falleaves >= 0) {		/* check for fallen leaves */
+	if (!imm_mode && falleaves >= 0) {	/* check for fallen leaves */
 		li = falleaves;
 		falleaves = qtL.wd[li];
 		mapit = qtL.tml <= qtL.tl ?
 				(li < qtL.tml || li >= qtL.tl) :
 				(li < qtL.tml && li >= qtL.tl) ;
-	} else {			/* else allocate new one */
+	} else {				/* else allocate new one */
 		li = qtL.tl++;
-		if (qtL.tl >= qtL.nl)	/* advance to next leaf in ring */
+		if (qtL.tl >= qtL.nl)		/* next leaf in ring */
 			qtL.tl = 0;
-		if (qtL.tl == qtL.bl)	/* need to shake some free */
+		if (qtL.tl == qtL.bl)		/* need to shake some free */
 			qtCompost(LFREEPCT);
-		mapit = 0;		/* we'll map it later */
+		mapit = 0;			/* we'll map it later */
 	}
-	VCOPY(qtL.wp[li], p);
-	qtL.wd[li] = encodedir(v);
+	if (p == NULL)
+		VSUM(qtL.wp[li], odev.v.vp, d, FHUGE);
+	else
+		VCOPY(qtL.wp[li], p);
+	qtL.wd[li] = encodedir(d);
 	tmCvColrs(&qtL.brt[li], qtL.chr[li], c, 1);
-	if (putleaf(li, 1) && mapit)
-		tmMapPixels(qtL.rgb+li, qtL.brt+li, qtL.chr+li, 1);
+	if (putleaf(li, 1)) {
+		if (mapit)
+			tmMapPixels(qtL.rgb+li, qtL.brt+li, qtL.chr+li, 1);
+		if (--rayqleft == 0)
+			dev_flush();		/* flush output */
+	}
 }