--- ray/src/rt/ambient.h	1992/08/10 08:46:38	2.4
+++ ray/src/rt/ambient.h	2023/11/15 18:02:52	2.27
@@ -1,43 +1,73 @@
-/* Copyright (c) 1991 Regents of the University of California */
-
-/* SCCSid "$SunId$ LBL" */
-
+/* RCSid $Id: ambient.h,v 2.27 2023/11/15 18:02:52 greg Exp $ */
 /*
  * Common definitions for interreflection routines.
+ *
+ * Include after ray.h
  */
 
+#ifndef _RAD_AMBIENT_H_
+#define _RAD_AMBIENT_H_
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /*
- * Since we've defined our vectors as float below to save space,
- * watch out for changes in the definitions of VCOPY() and DOT()
- * and don't pass these vectors to fvect routines.
+ * Normal and u-vector directions encoded using dircode.c
  */
 typedef struct ambrec {
+	struct ambrec  *next;	/* next in list */
 	float  pos[3];		/* position in space */
-	float  dir[3];		/* normal direction */
-	int  lvl;		/* recursion level of parent ray */
+	int32  ndir;		/* encoded surface normal */
+	int32  udir;		/* u-vector direction */
+	short  lvl;		/* recursion level of parent ray */
 	float  weight;		/* weight of parent ray */
-	float  rad;		/* validity radius */
-	COLOR  val;		/* computed ambient value */
-	float  gpos[3];		/* gradient wrt. position */
-	float  gdir[3];		/* gradient wrt. direction */
-	struct ambrec  *next;	/* next in list */
+	float  rad[2];		/* anisotropic radii (rad[0] <= rad[1]) */
+	float  gpos[2];		/* (u,v) gradient wrt. position */
+	float  gdir[2];		/* (u,v) gradient wrt. direction */
+	uint32  corral;		/* potential light leak direction flags */
+	SCOLOR  val;		/* computed indirect irradiance (last!) */
 }  AMBVAL;			/* ambient value */
 
-extern COLOR  ambval;		/* global ambient component */
-extern double  ambacc;		/* ambient accuracy */
-extern int  ambres;		/* ambient resolution */
-extern int  ambdiv;		/* number of divisions for calculation */
-extern int  ambssamp;		/* number of super-samples */
-extern int  ambounce;		/* number of ambient bounces */
-extern char  *amblist[];	/* ambient include/exclude list */
-extern int  ambincl;		/* include == 1, exclude == 0 */
+typedef struct ambtree {
+	AMBVAL	*alist;		/* ambient value list */
+	struct ambtree	*kid;	/* 8 child nodes */
+}  AMBTREE;			/* ambient octree */
+
 extern double  maxarad;		/* maximum ambient radius */
 extern double  minarad;		/* minimum ambient radius */
 
-extern double  sumambient(), doambient(), makeambient();
-
+#ifndef AVGREFL
 #define  AVGREFL	0.5	/* assumed average reflectance */
+#endif
 
-#define  AMBVALSIZ	75	/* number of bytes in portable AMBVAL struct */
-#define  AMBMAGIC	557	/* magic number for ambient value files */
+#define  AMBVALSIZ	(64+AMB_CNDX[3])	/* number of bytes in portable AMBVAL */
+#define  AMBMAGIC	561			/* magic number for ambient value file */
 #define  AMBFMT		"Radiance_ambval"	/* format id string */
+
+					/* defined in ambient.c */
+extern void	setambres(int ar);
+extern void	setambacc(double newa);
+extern void	setambient(void);
+extern void	multambient(SCOLOR aval, RAY *r, FVECT nrm);
+extern void	ambdone(void);
+extern void	ambnotify(OBJECT obj);
+extern int	ambsync(void);
+					/* defined in ambcomp.c */
+extern int	doambient(SCOLOR acol, RAY *r, double wt,
+				FVECT uv[2], float rad[2],
+				float gpos[2], float gdir[2], uint32 *crlp);
+					/* defined in ambio.c */
+extern int	*AMB_CNDX;	/* open ambient file RGBE indices */
+extern float	*AMB_WLPART;	/* open ambient file spectral range */
+extern int	amb_headline(char *hl, void *p);
+extern void	putambmagic(FILE *fp);
+extern int	hasambmagic(FILE *fp);
+extern int	writambval(AMBVAL *av, FILE *fp);
+extern int	readambval(AMBVAL *av, FILE *fp);
+extern int	ambvalOK(AMBVAL *av);
+
+#ifdef __cplusplus
+}
+#endif
+#endif /* _RAD_AMBIENT_H_ */
+