--- ray/src/rt/t_data.c	1989/04/11 13:30:37	1.3
+++ ray/src/rt/t_data.c	2014/07/08 18:25:00	2.11
@@ -1,18 +1,16 @@
-/* Copyright (c) 1989 Regents of the University of California */
-
 #ifndef lint
-static char SCCSid[] = "$SunId$ LBL";
+static const char	RCSid[] = "$Id: t_data.c,v 2.11 2014/07/08 18:25:00 greg Exp $";
 #endif
-
 /*
  *  t_data.c - routine for stored textures
- *
- *     6/4/86
  */
 
-#include  "ray.h"
+#include "copyright.h"
 
+#include  "ray.h"
 #include  "data.h"
+#include  "func.h"
+#include  "rtotypes.h"
 
 /*
  *	A stored texture is specified as follows:
@@ -31,88 +29,54 @@ static char SCCSid[] = "$SunId$ LBL";
  *  to get from the original coordinates to the current coordinates.
  */
 
-typedef struct {
-	struct {
-		double  sca;		/* scale factor */
-		double  xfm[4][4];	/* transformation matrix */
-	}  fore, back;
-}  XFORM;
 
-
-t_data(m, r)			/* interpolate texture data */
-register OBJREC  *m;
-RAY  *r;
+int
+t_data(			/* interpolate texture data */
+	OBJREC  *m,
+	RAY  *r
+)
 {
-	extern double  varvalue(), funvalue(), datavalue();
-	extern int  errno;
 	int  nv;
-	FVECT  dval, disp;
-	double  pt[MAXDIM];
+	FVECT  disp;
+	double  dval[3], pt[MAXDIM];
+	double  d;
 	DATARRAY  *dp;
-	register XFORM  *mxf;
-	register char  **sa;
-	register int  i;
+	MFUNC  *mf;
+	int  i;
 
 	if (m->oargs.nsargs < 8)
 		objerror(m, USER, "bad # arguments");
-	sa = m->oargs.sarg;
-
-	for (i = 7; i < m->oargs.nsargs && sa[i][0] != '-'; i++)
-		;
-	nv = i-7;
-	if ((mxf = (XFORM *)m->os) == NULL) {
-		mxf = (XFORM *)malloc(sizeof(XFORM));
-		if (mxf == NULL)
-			goto memerr;
-		mxf->fore.sca = 1.0;
-		setident4(mxf->fore.xfm);
-		if (xf(mxf->fore.xfm, &mxf->fore.sca,
-			m->oargs.nsargs-i, sa+i) != m->oargs.nsargs-i)
-			objerror(m, USER, "bad transform");
-		if (mxf->fore.sca < 0.0)
-			mxf->fore.sca = -mxf->fore.sca;
-		mxf->back.sca = 1.0;
-		setident4(mxf->back.xfm);
-		invxf(mxf->back.xfm, &mxf->back.sca,
-				m->oargs.nsargs-i, sa+i);
-		if (mxf->back.sca < 0.0)
-			mxf->back.sca = -mxf->back.sca;
-		m->os = (char *)mxf;
-	}
-
-	setmap(m, r, mxf->back.xfm, mxf->back.sca);
-
-	if (nv > MAXDIM)
-		goto dimerr;
-	if (!vardefined(sa[7]))
-		loadfunc(sa[6]);
+	dp = getdata(m->oargs.sarg[3]);
+	i = (1 << (nv = dp->nd)) - 1;
+	mf = getfunc(m, 6, i<<7, 1);
+	setfunc(m, r);
 	errno = 0;
 	for (i = 0; i < nv; i++)
-		pt[i] = varvalue(sa[i+7]);
-	if (errno)
+		pt[i] = evalue(mf->ep[i]);
+	if (errno == EDOM || errno == ERANGE)
 		goto computerr;
-	for (i = 0; i < 3; i++) {
-		dp = getdata(sa[i+3]);
+	dval[0] = datavalue(dp, pt);
+	for (i = 1; i < 3; i++) {
+		dp = getdata(m->oargs.sarg[i+3]);
 		if (dp->nd != nv)
-			goto dimerr;
+			objerror(m, USER, "dimension error");
 		dval[i] = datavalue(dp, pt);
 	}
 	errno = 0;
 	for (i = 0; i < 3; i++)
-		disp[i] = funvalue(sa[i], 3, dval);
-	if (errno)
+		disp[i] = funvalue(m->oargs.sarg[i], 3, dval);
+	if (errno == EDOM || errno == ERANGE)
 		goto computerr;
-
-	multv3(disp, disp, mxf->fore.xfm);
-	multv3(disp, disp, r->rofx);
-	for (i = 0; i < 3; i++)
-		r->pert[i] += disp[i] / (mxf->fore.sca * r->rofs);
-	return;
-dimerr:
-	objerror(m, USER, "dimension error");
-memerr:
-	error(SYSTEM, "out of memory in t_data");
+	if (mf->fxp != &unitxf)
+		multv3(disp, disp, mf->fxp->xfm);
+	if (r->rox != NULL) {
+		multv3(disp, disp, r->rox->f.xfm);
+		d = 1.0 / (mf->fxp->sca * r->rox->f.sca);
+	} else
+		d = 1.0 / mf->fxp->sca;
+	VSUM(r->pert, r->pert, disp, d);
+	return(0);
 computerr:
 	objerror(m, WARNING, "compute error");
-	return;
+	return(0);
 }