--- ray/src/common/bsdf_t.h	2011/02/18 00:40:25	3.1
+++ ray/src/common/bsdf_t.h	2015/04/05 01:32:01	3.12
@@ -1,7 +1,10 @@
+/* RCSid $Id: bsdf_t.h,v 3.12 2015/04/05 01:32:01 greg Exp $ */
 /*
  *  bsdf_t.h
  *  
- *  Support for variable-resolution BSDF trees
+ *  Support for variable-resolution BSDF trees.
+ *  Assumes "bsdf.h" already included.
+ *  Include after "ezxml.h" for SDloadTre() declaration.
  *
  *  Created by Greg Ward on 2/2/11.
  *
@@ -26,11 +29,39 @@ typedef struct SDNode_s {
 	} u;			/* subtrees or values (extends struct) */
 } SDNode;
 
+#define SD_FREFL	1	/* component reflects off front side */
+#define SD_BREFL	2	/* component reflects off back side */
+#define SD_FXMIT	3	/* component transmits through front side */
+#define SD_BXMIT	4	/* component transmits through back side */
+
+/* Variable-resolution BSDF holder */
+typedef struct {
+	int	sidef;		/* which component */
+	SDNode	*stc[3];	/* BSDF (Y,u,v) trees */
+} SDTre;
+
+/* Holder for cumulative distribution (sum of BSDF * projSA) */
+typedef struct SDTreCDst_s {
+				/* base fields; must come first */
+	SD_CDIST_BASE(SDTreCDst_s);
+	double	clim[2][2];	/* input coordinate limits */
+	double	max_psa;	/* maximum projected solid angle */
+	short	sidef;		/* which mode is in play */
+	short	isodist;	/* isotropic distribution? */
+	int	calen;		/* cumulative array length */
+	struct {
+		unsigned	hndx;	/* hilbert index */
+		unsigned	cuml;	/* cumulative value */
+	}	carr[1];	/* cumulative array (extends struct) */
+} SDTreCDst;	
+
+#ifdef _EZXML_H
 /* Load a variable-resolution BSDF tree from an open XML file */
-extern SDError		SDloadTre(SDData *sd, ezxml_t fl);
+extern SDError		SDloadTre(SDData *sd, ezxml_t wtl);
+#endif
 
 /* Our matrix handling routines */
-extern const SDFunc	SDhandleTre;
+extern SDFunc	SDhandleTre;
 
 #ifdef __cplusplus
 }