src/common/objutil.h

/* RCSid $Id$ */
/*
 *  Declarations for .OBJ file utility
 *
 *  Include after <stdio.h>
 *
 *  Created by Greg Ward on Wed Feb 11 2004.
 */

#ifndef _OBJUTIL_H_
#define _OBJUTIL_H_

#ifndef DUP_CHECK_REVERSE
#define DUP_CHECK_REVERSE       1       /* eliminate flipped duplicates */
#endif
#ifndef POPEN_SUPPORT
#define POPEN_SUPPORT           1       /* support "!command" i/o */
#endif
                                        /* face flags */
#define FACE_SELECTED           01
#define FACE_DEGENERATE         02
#define FACE_DUPLICATE          04

struct Face;                            /* forward declaration */

typedef struct {
        int             vid;            /* vertex id */
        int             tid;            /* texture id */
        int             nid;            /* normal id */
        struct Face     *fnext;         /* next in vertex face list */
} VertEnt;

/* Structure to hold face and its vertex references */
typedef struct Face {
        struct Face     *next;          /* next face in main list */
        short           flags;          /* face selected, etc */
        short           nv;             /* number of vertices */
        short           grp;            /* group/object index */
        short           mat;            /* material index */
        /* in cases where the same vertex appears twice, first has link */
        VertEnt         v[3];           /* vertex list (extends struct) */
} Face;

/* Structure to hold vertex */
typedef struct {
        double          p[3];           /* 3-D position */
        Face            *vflist;        /* linked face list (no repeats) */
} Vertex;

/* Structure to hold texture coordinate */
typedef struct {
        float           u, v;           /* 2-D local texture coordinate */
} TexCoord;

/* Array to hold surface normal */
typedef float           Normal[3];

/* Structure to hold a loaded .OBJ file */
typedef struct {
        char            **descr;        /* descriptive comments */
        int             ndescr;         /* number of comments */
        char            **grpname;      /* object/group name list */
        int             ngrps;          /* number of group names */
        int             lastgrp;        /* last group seen */
        char            **matname;      /* material name list */
        int             nmats;          /* number of materials */
        int             lastmat;        /* last material seen */
        Vertex          *vert;          /* vertex array */
        int             nverts;         /* number of vertices */
        TexCoord        *tex;           /* texture coordinate array */
        int             ntex;           /* number of texture coord's */
        Normal          *norm;          /* surface normal array */
        int             nnorms;         /* number of surface normals */
        Face            *flist;         /* linked face list */
        int             nfaces;         /* count of faces */
} Scene;

#ifdef __cplusplus
extern "C" {
#endif

/* Allocate a new scene holder */
Scene *         newScene(void);

/* Add a .OBJ file to a scene */
Scene *         loadOBJ(Scene *sc, const char *fspec);

/* Duplicate a scene */
Scene *         dupScene(const Scene *sc);

/* Add a descriptive comment */
void            addComment(Scene *sc, const char *comment);

/* Clear comments */
void            clearComments(Scene *sc);

/* Write a .OBJ file, return # faces written or -1 on error */
int             toOBJ(Scene *sc, FILE *fp);
int             writeOBJ(Scene *sc, const char *fspec);

/* Convert indicated faces to Radiance, return # written or -1 on error */
int             toRadiance(Scene *sc, FILE *fp, int flreq, int flexc);
int             writeRadiance(Scene *sc, const char *fspec,
                                int flreq, int flexc);

/* Compute face area (and normal) */
double          faceArea(const Scene *sc, const Face *f, Normal nrm);

/* Eliminate duplicate vertices, return # joined */
int             coalesceVertices(Scene *sc, double eps);

/* Identify duplicate faces */
int             findDuplicateFaces(Scene *sc);

/* Delete indicated faces, return # deleted */
int             deleteFaces(Scene *sc, int flreq, int flexc);

/* Clear face selection */
void            clearSelection(Scene *sc, int set);

/* Invert face selection */
void            invertSelection(Scene *sc);

/* Count number of faces selected */
int             numberSelected(Scene *sc);

/* Select faces by object name (modifies current) */
void            selectGroup(Scene *sc, const char *gname, int invert);

/* Select faces by material name (modifies current) */
void            selectMaterial(Scene *sc, const char *mname, int invert);

/* Execute callback on indicated faces */
int             foreachFace(Scene *sc, int (*cb)(Scene *, Face *, void *),
                                        int flreq, int flexc, void *c_data);

/* Remove texture coordinates from the indicated faces */
int             removeTexture(Scene *sc, int flreq, int flexc);

/* Remove surface normals from the indicated faces */
int             removeNormals(Scene *sc, int flreq, int flexc);

/* Change group for the indicated faces */
int             changeGroup(Scene *sc, const char *gname,
                                        int flreq, int flexc);

/* Change material for the indicated faces */
int             changeMaterial(Scene *sc, const char *mname,
                                        int flreq, int flexc);

/* Grab texture coord's/normals from another object via ray tracing */
#define GET_TEXTURE             01
#define GET_NORMALS             02
int             traceSurface(Scene *sc, int flreq, int flexc,
                                const char *oct, int what);

/* Free a scene */
void            freeScene(Scene *sc);

/* Find an existing name in a list of names */
int             findName(const char *nm, const char **nmlist, int n);

/* Verbose mode global */
extern int      verbose;

extern char     *emalloc(unsigned int n);
extern char     *ecalloc(unsigned int ne, unsigned int n);
extern char     *erealloc(char *cp, unsigned int n);
extern void     efree(char *cp); 

#define CHUNKSIZ        128     /* object allocation chunk size */

#define chunk_alloc(typ, arr, nold) \
                ((nold)%CHUNKSIZ ? (arr) : \
                (typ *)erealloc((char *)(arr), sizeof(typ)*((nold)+CHUNKSIZ)))

#ifdef __cplusplus
}
#endif

#endif  /* ! _OBJUTIL_H_ */
Revision:	2.1
Committed:	Mon Mar 30 18:28:35 2020 UTC (4 years, 1 month ago) by greg
Content type:	text/plain
Branch:	MAIN
Log Message:	Created robjutil tool to manipulate Wavefront .OBJ files
#	User	Rev	Content
1	greg	2.1	/* RCSid $Id$ */
2			/*
3			* Declarations for .OBJ file utility
4			*
5			* Include after <stdio.h>
6			*
7			* Created by Greg Ward on Wed Feb 11 2004.
8			*/
9
10			#ifndef _OBJUTIL_H_
11			#define _OBJUTIL_H_
12
13			#ifndef DUP_CHECK_REVERSE
14			#define DUP_CHECK_REVERSE 1 /* eliminate flipped duplicates */
15			#endif
16			#ifndef POPEN_SUPPORT
17			#define POPEN_SUPPORT 1 /* support "!command" i/o */
18			#endif
19			/* face flags */
20			#define FACE_SELECTED 01
21			#define FACE_DEGENERATE 02
22			#define FACE_DUPLICATE 04
23
24			struct Face; /* forward declaration */
25
26			typedef struct {
27			int vid; /* vertex id */
28			int tid; /* texture id */
29			int nid; /* normal id */
30			struct Face fnext; / next in vertex face list */
31			} VertEnt;
32
33			/* Structure to hold face and its vertex references */
34			typedef struct Face {
35			struct Face next; / next face in main list */
36			short flags; /* face selected, etc */
37			short nv; /* number of vertices */
38			short grp; /* group/object index */
39			short mat; /* material index */
40			/* in cases where the same vertex appears twice, first has link */
41			VertEnt v[3]; /* vertex list (extends struct) */
42			} Face;
43
44			/* Structure to hold vertex */
45			typedef struct {
46			double p[3]; /* 3-D position */
47			Face vflist; / linked face list (no repeats) */
48			} Vertex;
49
50			/* Structure to hold texture coordinate */
51			typedef struct {
52			float u, v; /* 2-D local texture coordinate */
53			} TexCoord;
54
55			/* Array to hold surface normal */
56			typedef float Normal[3];
57
58			/* Structure to hold a loaded .OBJ file */
59			typedef struct {
60			char *descr; / descriptive comments */
61			int ndescr; /* number of comments */
62			char *grpname; / object/group name list */
63			int ngrps; /* number of group names */
64			int lastgrp; /* last group seen */
65			char *matname; / material name list */
66			int nmats; /* number of materials */
67			int lastmat; /* last material seen */
68			Vertex vert; / vertex array */
69			int nverts; /* number of vertices */
70			TexCoord tex; / texture coordinate array */
71			int ntex; /* number of texture coord's */
72			Normal norm; / surface normal array */
73			int nnorms; /* number of surface normals */
74			Face flist; / linked face list */
75			int nfaces; /* count of faces */
76			} Scene;
77
78			#ifdef __cplusplus
79			extern "C" {
80			#endif
81
82			/* Allocate a new scene holder */
83			Scene * newScene(void);
84
85			/* Add a .OBJ file to a scene */
86			Scene * loadOBJ(Scene sc, const char fspec);
87
88			/* Duplicate a scene */
89			Scene * dupScene(const Scene *sc);
90
91			/* Add a descriptive comment */
92			void addComment(Scene sc, const char comment);
93
94			/* Clear comments */
95			void clearComments(Scene *sc);
96
97			/* Write a .OBJ file, return # faces written or -1 on error */
98			int toOBJ(Scene sc, FILE fp);
99			int writeOBJ(Scene sc, const char fspec);
100
101			/* Convert indicated faces to Radiance, return # written or -1 on error */
102			int toRadiance(Scene sc, FILE fp, int flreq, int flexc);
103			int writeRadiance(Scene sc, const char fspec,
104			int flreq, int flexc);
105
106			/* Compute face area (and normal) */
107			double faceArea(const Scene sc, const Face f, Normal nrm);
108
109			/* Eliminate duplicate vertices, return # joined */
110			int coalesceVertices(Scene *sc, double eps);
111
112			/* Identify duplicate faces */
113			int findDuplicateFaces(Scene *sc);
114
115			/* Delete indicated faces, return # deleted */
116			int deleteFaces(Scene *sc, int flreq, int flexc);
117
118			/* Clear face selection */
119			void clearSelection(Scene *sc, int set);
120
121			/* Invert face selection */
122			void invertSelection(Scene *sc);
123
124			/* Count number of faces selected */
125			int numberSelected(Scene *sc);
126
127			/* Select faces by object name (modifies current) */
128			void selectGroup(Scene sc, const char gname, int invert);
129
130			/* Select faces by material name (modifies current) */
131			void selectMaterial(Scene sc, const char mname, int invert);
132
133			/* Execute callback on indicated faces */
134			int foreachFace(Scene sc, int (cb)(Scene , Face , void *),
135			int flreq, int flexc, void *c_data);
136
137			/* Remove texture coordinates from the indicated faces */
138			int removeTexture(Scene *sc, int flreq, int flexc);
139
140			/* Remove surface normals from the indicated faces */
141			int removeNormals(Scene *sc, int flreq, int flexc);
142
143			/* Change group for the indicated faces */
144			int changeGroup(Scene sc, const char gname,
145			int flreq, int flexc);
146
147			/* Change material for the indicated faces */
148			int changeMaterial(Scene sc, const char mname,
149			int flreq, int flexc);
150
151			/* Grab texture coord's/normals from another object via ray tracing */
152			#define GET_TEXTURE 01
153			#define GET_NORMALS 02
154			int traceSurface(Scene *sc, int flreq, int flexc,
155			const char *oct, int what);
156
157			/* Free a scene */
158			void freeScene(Scene *sc);
159
160			/* Find an existing name in a list of names */
161			int findName(const char nm, const char *nmlist, int n);
162
163			/* Verbose mode global */
164			extern int verbose;
165
166			extern char *emalloc(unsigned int n);
167			extern char *ecalloc(unsigned int ne, unsigned int n);
168			extern char erealloc(char cp, unsigned int n);
169			extern void efree(char *cp);
170
171			#define CHUNKSIZ 128 /* object allocation chunk size */
172
173			#define chunk_alloc(typ, arr, nold) \
174			((nold)%CHUNKSIZ ? (arr) : \
175			(typ )erealloc((char )(arr), sizeof(typ)*((nold)+CHUNKSIZ)))
176
177			#ifdef __cplusplus
178			}
179			#endif
180
181			#endif /* ! _OBJUTIL_H_ */