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root/radiance/ray/src/common/bsdf_t.h
Revision: 3.7
Committed: Wed Apr 27 20:03:25 2011 UTC (13 years ago) by greg
Content type: text/plain
Branch: MAIN
Changes since 3.6: +7 -3 lines
Log Message:
Initial untested variable-resolution BSDF

File Contents

# Content
1 /* RCSid $Id: bsdf_t.h,v 3.6 2011/04/24 19:39:21 greg Exp $ */
2 /*
3 * bsdf_t.h
4 *
5 * Support for variable-resolution BSDF trees.
6 * Assumes "bsdf.h" already included.
7 * Include after "ezxml.h" for SDloadTre() declaration.
8 *
9 * Created by Greg Ward on 2/2/11.
10 *
11 */
12
13 #ifndef _BSDF_T_H_
14 #define _BSDF_T_H_
15
16 #ifdef __cplusplus
17 extern "C" {
18 #endif
19
20 #define SD_MAXDIM 4 /* maximum expected # dimensions */
21
22 /* Basic node structure for variable-resolution BSDF data */
23 typedef struct SDNode_s {
24 short ndim; /* number of dimensions */
25 short log2GR; /* log(2) of grid resolution (< 0 for tree) */
26 union {
27 struct SDNode_s *t[1]; /* subtree pointers */
28 float v[1]; /* scattering value(s) */
29 } u; /* subtrees or values (extends struct) */
30 } SDNode;
31
32 #define SD_UFRONT 0x1 /* flag for BSDF uses front side */
33 #define SD_UBACK 0x2 /* flag for BSDF uses back side */
34 #define SD_XMIT 0x3 /* combine the two for transmission */
35
36 /* Variable-resolution BSDF holder */
37 typedef struct {
38 int sidef; /* transmitted component? */
39 SDNode *st; /* BSDF tree */
40 } SDTre;
41
42 /* Holder for cumulative distribution (sum of BSDF * projSA) */
43 typedef struct {
44 SD_CDIST_BASE; /* base fields; must come first */
45 double clim[2][2]; /* input coordinate limits */
46 double max_psa; /* maximum projected solid angle */
47 int sidef; /* which side(s) to use */
48 int calen; /* cumulative array length */
49 struct {
50 unsigned hndx; /* hilbert index */
51 unsigned cuml; /* cumulative value */
52 } carr[1]; /* cumulative array (extends struct) */
53 } SDTreCDst;
54
55 #ifdef _EZXML_H
56 /* Load a variable-resolution BSDF tree from an open XML file */
57 extern SDError SDloadTre(SDData *sd, ezxml_t wtl);
58 #endif
59
60 /* Our matrix handling routines */
61 extern SDFunc SDhandleTre;
62
63 #ifdef __cplusplus
64 }
65 #endif
66 #endif /* ! _BSDF_T_H_ */