--- ray/src/rt/lookamb.c	1991/06/06 10:09:50	1.3
+++ ray/src/rt/lookamb.c	2023/12/18 20:19:48	2.19
@@ -1,95 +1,62 @@
-/* Copyright (c) 1991 Regents of the University of California */
-
 #ifndef lint
-static char SCCSid[] = "$SunId$ LBL";
+static const char	RCSid[] = "$Id: lookamb.c,v 2.19 2023/12/18 20:19:48 greg Exp $";
 #endif
-
 /*
  *  lookamb.c - program to examine ambient components.
- *
- *     10/8/86
  */
 
-#include  <stdio.h>
+#include "copyright.h"
 
-#include  "color.h"
+#include  "platform.h"
+#include  "ray.h"
+#include  "ambient.h"
 
 
-typedef struct ambval {
-	float  pos[3];		/* position in space */
-	float  dir[3];		/* normal direction */
-	int  lvl;		/* recursion level of parent ray */
-	float  weight;		/* weight of parent ray */
-	COLOR  val;		/* computed ambient value */
-	float  rad;		/* validity radius */
-	struct ambval  *next;	/* next in list */
-}  AMBVAL;			/* ambient value */
-
 int  dataonly = 0;
-
+int  header = 1;
 int  reverse = 0;
 
 AMBVAL  av;
 
 
-main(argc, argv)		/* load ambient values from a file */
-char  *argv[];
+static void
+lookamb(			/* load & convert ambient values from a file */
+	FILE  *fp
+)
 {
-	FILE  *fp;
-	int  i;
+	FVECT	norm, uvec;
+	COLOR	avcol;
 
-	for (i = 1; i < argc; i++)
-		if (argv[i][0] == '-')
-			switch (argv[i][1]) {
-			case 'd':
-				dataonly = 1;
-				break;
-			case 'r':
-				reverse = 1;
-				break;
-			default:
-				fprintf(stderr, "%s: unknown option '%s'\n",
-						argv[0], argv[i]);
-				return(1);
-			}
-		else
-			break;
-
-	if (i >= argc)
-		fp = stdin;
-	else if ((fp = fopen(argv[i], "r")) == NULL) {
-		fprintf(stderr, "%s: file not found\n", argv[i]);
-		return(1);
-	}
-	if (reverse)
-		writamb(fp);
-	else
-		lookamb(fp);
-	fclose(fp);
-	return(0);
-}
-
-
-lookamb(fp)			/* get ambient values from a file */
-FILE  *fp;
-{
-	while (fread((char *)&av, sizeof(AMBVAL), 1, fp) == 1) {
+	while (readambval(&av, fp)) {
+		decodedir(norm, av.ndir);
+		decodedir(uvec, av.udir);
+		scolor2rgb(avcol, av.val, AMB_CNDX[3], AMB_WLPART);
 		if (dataonly) {
 			printf("%f\t%f\t%f\t", av.pos[0], av.pos[1], av.pos[2]);
-			printf("%f\t%f\t%f\t", av.dir[0], av.dir[1], av.dir[2]);
-			printf("%d\t%f\t%f\t", av.lvl, av.weight, av.rad);
-			printf("%e\t%e\t%e\n", colval(av.val,RED),
-						colval(av.val,GRN),
-						colval(av.val,BLU));
+			printf("%f\t%f\t%f\t", norm[0], norm[1], norm[2]);
+			printf("%f\t%f\t%f\t", uvec[0], uvec[1], uvec[2]);
+			printf("%d\t%f\t%f\t%f\t", av.lvl, av.weight,
+					av.rad[0], av.rad[1]);
+			printf("%e\t%e\t%e\t", colval(avcol,RED),
+						colval(avcol,GRN),
+						colval(avcol,BLU));
+			printf("%f\t%f\t", av.gpos[0], av.gpos[1]);
+			printf("%f\t%f\t", av.gdir[0], av.gdir[1]);
+			printf("%u\n", av.corral);
 		} else {
-			printf("\nPosition:\t%f\t%f\t%f\n", av.pos[0],
+			printf("Position:\t%f\t%f\t%f\n", av.pos[0],
 					av.pos[1], av.pos[2]);
-			printf("Direction:\t%f\t%f\t%f\n", av.dir[0],
-					av.dir[1], av.dir[2]);
-			printf("Lvl,Wt,Rad:\t%d\t\t%f\t%f\n", av.lvl,
-					av.weight, av.rad);
-			printf("Value:\t\t%e\t%e\t%e\n", colval(av.val,RED),
-					colval(av.val,GRN), colval(av.val,BLU));
+			printf("Normal:\t\t%f\t%f\t%f\n",
+					norm[0], norm[1], norm[2]);
+			printf("Uvector:\t%f\t%f\t%f\n",
+					uvec[0], uvec[1], uvec[2]);
+			printf("Lvl,Wt,UVrad:\t%d\t\t%f\t%f\t%f\n", av.lvl,
+					av.weight, av.rad[0], av.rad[1]);
+			printf("Value:\t\t%e\t%e\t%e\n", colval(avcol,RED),
+					colval(avcol,GRN), colval(avcol,BLU));
+			printf("Pos.Grad:\t%f\t%f\n", av.gpos[0], av.gpos[1]);
+			printf("Dir.Grad:\t%f\t%f\n", av.gdir[0], av.gdir[1]);
+			printf("Corral:\t\t%8X\n\n", av.corral);
 		}
 		if (ferror(stdout))
 			exit(1);
@@ -97,9 +64,14 @@ FILE  *fp;
 }
 
 
-writamb(fp)			/* write binary ambient values */
-FILE  *fp;
+static void
+writamb(			/* write binary ambient values to stdout */
+	FILE  *fp
+)
 {
+	FVECT	norm;
+	COLOR	avcol;
+
 	for ( ; ; ) {
 		if (!dataonly)
 			fscanf(fp, "%*s");
@@ -108,21 +80,111 @@ FILE  *fp;
 			return;
 		if (!dataonly)
 			fscanf(fp, "%*s");
-		if (fscanf(fp, "%f %f %f",
-				&av.dir[0], &av.dir[1], &av.dir[2]) != 3)
+		if (fscanf(fp, FVFORMAT, &norm[0], &norm[1], &norm[2]) != 3 ||
+				normalize(norm) == 0)
 			return;
+		av.ndir = encodedir(norm);
 		if (!dataonly)
 			fscanf(fp, "%*s");
-		if (fscanf(fp, "%d %f %f",
-				&av.lvl, &av.weight, &av.rad) != 3)
+		if (fscanf(fp, FVFORMAT, &norm[0], &norm[1], &norm[2]) != 3 ||
+				normalize(norm) == 0)
 			return;
+		av.udir = encodedir(norm);
 		if (!dataonly)
 			fscanf(fp, "%*s");
+		if (fscanf(fp, "%hd %f %f %f", &av.lvl, &av.weight,
+				&av.rad[0], &av.rad[1]) != 4)
+			return;
+		if (!dataonly)
+			fscanf(fp, "%*s");
 		if (fscanf(fp, "%f %f %f",
-				&av.val[RED], &av.val[GRN], &av.val[BLU]) != 3)
+				&avcol[RED], &avcol[GRN], &avcol[BLU]) != 3)
 			return;
-		fwrite((char *)&av, sizeof(AMBVAL), 1, stdout);
-		if (ferror(stdout))
+		setscolor(av.val, avcol[RED], avcol[GRN], avcol[BLU]);
+		if (!dataonly)
+			fscanf(fp, "%*s");
+		if (fscanf(fp, "%f %f", &av.gpos[0], &av.gpos[1]) != 2)
+			return;
+		if (!dataonly)
+			fscanf(fp, "%*s");
+		if (fscanf(fp, "%f %f", &av.gdir[0], &av.gdir[1]) != 2)
+			return;
+		if (dataonly) {
+			if (fscanf(fp, "%u", &av.corral) != 1)
+				return;
+		} else if (fscanf(fp, "%*s %X", &av.corral) != 1)
+			return;
+		av.next = NULL;
+		if (writambval(&av, stdout) < 0)
 			exit(1);
 	}
+}
+
+
+int
+main(		/* load ambient values from a file */
+	int  argc,
+	char  *argv[]
+)
+{
+	FILE  *fp;
+	int  i;
+
+	for (i = 1; i < argc; i++)
+		if (argv[i][0] == '-')
+			switch (argv[i][1]) {
+			case 'd':
+				dataonly = 1;
+				break;
+			case 'r':
+				reverse = 1;
+				break;
+			case 'h':
+				header = 0;
+				break;
+			default:
+				fprintf(stderr, "%s: unknown option '%s'\n",
+						argv[0], argv[i]);
+				return(1);
+			}
+		else
+			break;
+
+	if (i >= argc)
+		fp = stdin;
+	else if ((fp = fopen(argv[i], "r")) == NULL) {
+		fprintf(stderr, "%s: file not found\n", argv[i]);
+		return(1);
+	}
+	if (reverse) {
+		SET_FILE_BINARY(stdout);
+		if (header) {
+			if (checkheader(fp, "ascii", stdout) < 0)
+				goto formaterr;
+		} else {
+			newheader("RADIANCE", stdout);
+			printargs(argc, argv, stdout);
+		}
+		fputncomp(3, stdout);
+		fputformat(AMBFMT, stdout);
+		fputc('\n', stdout);
+		putambmagic(stdout);
+		writamb(fp);
+	} else {
+		SET_FILE_BINARY(fp);
+		if (getheader(fp, amb_headline, header ? stdout : (FILE *)NULL) < 0)
+			goto formaterr;
+		if (!hasambmagic(fp))
+			goto formaterr;
+		if (header) {
+			fputformat("ascii", stdout);
+			fputc('\n', stdout);
+		}
+		lookamb(fp);
+	}
+	fclose(fp);
+	return(0);
+formaterr:
+	fprintf(stderr, "%s: format error on input\n", argv[0]);
+	exit(1);
 }