--- ray/src/rt/mx_data.c	1991/08/08 11:29:53	1.2
+++ ray/src/rt/mx_data.c	2004/03/30 16:13:01	2.9
@@ -1,85 +1,144 @@
-/* Copyright (c) 1988 Regents of the University of California */
-
 #ifndef lint
-static char SCCSid[] = "$SunId$ LBL";
+static const char	RCSid[] = "$Id: mx_data.c,v 2.9 2004/03/30 16:13:01 schorsch Exp $";
 #endif
-
 /*
  *  mx_data.c - routine for stored mixtures.
- *
- *     11/2/88
  */
 
-#include  "ray.h"
+#include "copyright.h"
 
+#include  "ray.h"
 #include  "data.h"
+#include  "func.h"
+#include  "rtotypes.h"
 
 /*
- *	A stored mixture is specified:
+ *  A stored mixture is specified:
  *
  *	modifier mixdata name
  *	6+ foremod backmod func dfname vfname v0 v1 .. xf
  *	0
  *	n A1 A2 ..
  *
+ *  A picture mixture is specified as:
+ *
+ *	modifier mixpict name
+ *	7+ foremod backmod func pfname vfname vx vy xf
+ *	0
+ *	n A1 A2 ..
+ *
+ *
  *  Vfname is the name of the file where the variable definitions
  *  can be found.  The list of real arguments can be accessed by
  *  definitions in the file.  Dfname is the data file.
+ *  (Pfname is a picture file.)
  *  The dimensions of the data files and the number
  *  of variables must match.  The func is a single argument
- *  function which returns the corrected data value given the
+ *  function in the case of mixdata (three argument in the case
+ *  of mixpict), which returns the corrected data value given the
  *  interpolated value from the file.  The xf is a transformation
  *  to get from the original coordinates to the current coordinates.
  */
 
 
-mx_data(m, r)			/* interpolate mixture data */
-register OBJREC  *m;
-RAY  *r;
+extern int
+mx_data(			/* interpolate mixture data */
+	register OBJREC  *m,
+	RAY  *r
+)
 {
-	extern double  varvalue(), funvalue(), datavalue();
-	extern int  errno;
-	register int  i;
+	OBJECT	obj;
 	double  coef;
 	double  pt[MAXDIM];
 	DATARRAY  *dp;
 	OBJECT  mod[2];
-	register char  **sa;
+	register MFUNC  *mf;
+	register int  i;
 
-	setfunc(m, r);
-
-	sa = m->oargs.sarg;
-
 	if (m->oargs.nsargs < 6)
 		objerror(m, USER, "bad # arguments");
+	obj = objndx(m);
 	for (i = 0; i < 2; i++)
-		if (!strcmp(sa[i], VOIDID))
+		if (!strcmp(m->oargs.sarg[i], VOIDID))
 			mod[i] = OVOID;
-		else if ((mod[i] = modifier(sa[i])) == OVOID) {
-			sprintf(errmsg, "undefined modifier \"%s\"", sa[i]);
+		else if ((mod[i] = lastmod(obj, m->oargs.sarg[i])) == OVOID) {
+			sprintf(errmsg, "undefined modifier \"%s\"",
+					m->oargs.sarg[i]);
 			objerror(m, USER, errmsg);
 		}
-	funcfile(sa[4]);
-	for (i = 0; i+5 < m->oargs.nsargs &&
-			sa[i+5][0] != '-'; i++) {
-		if (i >= MAXDIM)
-			objerror(m, USER, "dimension error");
-		errno = 0;
-		pt[i] = varvalue(sa[i+5]);
-		if (errno)
+	dp = getdata(m->oargs.sarg[3]);
+	i = (1 << dp->nd) - 1;
+	mf = getfunc(m, 4, i<<5, 0);
+	setfunc(m, r);
+	errno = 0;
+	for (i = 0; i < dp->nd; i++) {
+		pt[i] = evalue(mf->ep[i]);
+		if (errno == EDOM || errno == ERANGE)
 			goto computerr;
 	}
-	dp = getdata(sa[3]);
-	if (dp->nd != i)
-		objerror(m, USER, "dimension error");
 	coef = datavalue(dp, pt);
 	errno = 0;
-	coef = funvalue(sa[2], 1, &coef);
-	if (errno)
+	coef = funvalue(m->oargs.sarg[2], 1, &coef);
+	if (errno == EDOM || errno == ERANGE)
 		goto computerr;
-	raymixture(r, mod[0], mod[1], coef);
-	return;
+	if (raymixture(r, mod[0], mod[1], coef)) {
+		if (m->omod != OVOID)
+			objerror(m, USER, "inappropriate modifier");
+		return(1);
+	}
+	return(0);
+computerr:
+	objerror(m, WARNING, "compute error");
+	return(0);
+}
 
+
+extern int
+mx_pdata(			/* interpolate mixture picture */
+	register OBJREC  *m,
+	RAY  *r
+)
+{
+	OBJECT	obj;
+	double	col[3], coef;
+	double  pt[MAXDIM];
+	DATARRAY  *dp;
+	OBJECT  mod[2];
+	register MFUNC  *mf;
+	register int  i;
+
+	if (m->oargs.nsargs < 7)
+		objerror(m, USER, "bad # arguments");
+	obj = objndx(m);
+	for (i = 0; i < 2; i++)
+		if (!strcmp(m->oargs.sarg[i], VOIDID))
+			mod[i] = OVOID;
+		else if ((mod[i] = lastmod(obj, m->oargs.sarg[i])) == OVOID) {
+			sprintf(errmsg, "undefined modifier \"%s\"",
+					m->oargs.sarg[i]);
+			objerror(m, USER, errmsg);
+		}
+	dp = getpict(m->oargs.sarg[3]);
+	mf = getfunc(m, 4, 0x3<<5, 0);
+	setfunc(m, r);
+	errno = 0;
+	pt[1] = evalue(mf->ep[0]);	/* y major ordering */
+	pt[0] = evalue(mf->ep[1]);
+	if (errno == EDOM || errno == ERANGE)
+		goto computerr;
+	for (i = 0; i < 3; i++)		/* get pixel from picture */
+		col[i] = datavalue(dp+i, pt);
+	errno = 0;			/* evaluate function on pixel */
+	coef = funvalue(m->oargs.sarg[2], 3, col);
+	if (errno == EDOM || errno == ERANGE)
+		goto computerr;
+	if (raymixture(r, mod[0], mod[1], coef)) {
+		if (m->omod != OVOID)
+			objerror(m, USER, "inappropriate modifier");
+		return(1);
+	}
+	return(0);
 computerr:
 	objerror(m, WARNING, "compute error");
+	return(0);
 }