--- ray/src/common/bsdf_t.h	2011/02/18 00:41:44	3.2
+++ ray/src/common/bsdf_t.h	2011/06/03 18:12:58	3.8
@@ -1,8 +1,10 @@
-/* RCSid $Id: bsdf_t.h,v 3.2 2011/02/18 00:41:44 greg Exp $ */
+/* RCSid $Id: bsdf_t.h,v 3.8 2011/06/03 18:12:58 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.
  *
@@ -27,11 +29,37 @@ typedef struct SDNode_s {
 	} u;			/* subtrees or values (extends struct) */
 } SDNode;
 
+#define SD_UFRONT	0x1	/* flag for BSDF uses front side */
+#define SD_UBACK	0x2	/* flag for BSDF uses back side */
+#define SD_XMIT		0x3	/* combine the two for transmission */
+
+/* Variable-resolution BSDF holder */
+typedef struct {
+	int	sidef;		/* transmitted component? */
+	SDNode	*st;		/* BSDF tree */
+} SDTre;
+
+/* Holder for cumulative distribution (sum of BSDF * projSA) */
+typedef struct {
+	SD_CDIST_BASE;		/* base fields; must come first */
+	double	clim[2][2];	/* input coordinate limits */
+	double	max_psa;	/* maximum projected solid angle */
+	short	sidef;		/* which side(s) to use */
+	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
 }