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greg |
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/* RCSid: $Id: parser.h,v 1.39 2011/01/14 05:46:12 greg Exp $ */ |
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/* |
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* Header file for MGF interpreter |
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*/ |
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#ifndef _MGF_PARSER_H_ |
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#define _MGF_PARSER_H_ |
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/* must include stdio.h and stdlib.h before us */ |
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#include "rtmath.h" |
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#include "ccolor.h" |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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#define MG_VMAJOR 2 /* major version number */ |
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#define MG_VMINOR 0 /* minor version number */ |
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/* Entities (list is only appended, never modified) */ |
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#define MG_E_COMMENT 0 /* # */ |
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#define MG_E_COLOR 1 /* c */ |
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#define MG_E_CCT 2 /* cct */ |
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#define MG_E_CONE 3 /* cone */ |
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#define MG_E_CMIX 4 /* cmix */ |
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#define MG_E_CSPEC 5 /* cspec */ |
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#define MG_E_CXY 6 /* cxy */ |
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#define MG_E_CYL 7 /* cyl */ |
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#define MG_E_ED 8 /* ed */ |
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#define MG_E_FACE 9 /* f */ |
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#define MG_E_INCLUDE 10 /* i */ |
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#define MG_E_IES 11 /* ies */ |
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#define MG_E_IR 12 /* ir */ |
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#define MG_E_MATERIAL 13 /* m */ |
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#define MG_E_NORMAL 14 /* n */ |
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#define MG_E_OBJECT 15 /* o */ |
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#define MG_E_POINT 16 /* p */ |
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#define MG_E_PRISM 17 /* prism */ |
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#define MG_E_RD 18 /* rd */ |
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#define MG_E_RING 19 /* ring */ |
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#define MG_E_RS 20 /* rs */ |
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#define MG_E_SIDES 21 /* sides */ |
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#define MG_E_SPH 22 /* sph */ |
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#define MG_E_TD 23 /* td */ |
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#define MG_E_TORUS 24 /* torus */ |
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#define MG_E_TS 25 /* ts */ |
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#define MG_E_VERTEX 26 /* v */ |
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#define MG_E_XF 27 /* xf */ |
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/* end of Version 1 entities */ |
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#define MG_E_FACEH 28 /* fh */ |
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/* end of Version 2 entities */ |
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#define MG_NENTITIES 29 /* total # entities */ |
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#define MG_NELIST {28,29} /* entity count for version 1 and up */ |
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#define MG_NAMELIST {"#","c","cct","cone","cmix","cspec","cxy","cyl","ed",\ |
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"f","i","ies","ir","m","n","o","p","prism","rd",\ |
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"ring","rs","sides","sph","td","torus","ts","v","xf",\ |
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"fh"} |
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#define MG_MAXELEN 6 |
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extern char mg_ename[MG_NENTITIES][MG_MAXELEN]; |
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/* Handler routines for each entity and unknown ones */ |
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extern int (*mg_ehand[MG_NENTITIES])(int argc, char **argv); |
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extern int (*mg_uhand)(int argc, char **argv); |
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extern int mg_defuhand(int, char **); |
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extern unsigned mg_nunknown; /* count of unknown entities */ |
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/* Error codes */ |
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#define MG_OK 0 /* normal return value */ |
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#define MG_EUNK 1 /* unknown entity */ |
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#define MG_EARGC 2 /* wrong number of arguments */ |
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#define MG_ETYPE 3 /* argument type error */ |
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#define MG_EILL 4 /* illegal argument value */ |
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#define MG_EUNDEF 5 /* undefined reference */ |
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#define MG_ENOFILE 6 /* cannot open input file */ |
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#define MG_EINCL 7 /* error in included file */ |
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#define MG_EMEM 8 /* out of memory */ |
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#define MG_ESEEK 9 /* file seek error */ |
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#define MG_EBADMAT 10 /* bad material specification */ |
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#define MG_ELINE 11 /* input line too long */ |
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#define MG_ECNTXT 12 /* unmatched context close */ |
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#define MG_NERRS 13 |
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extern char *mg_err[MG_NERRS]; /* list of error messages */ |
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/* |
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* The general process for running the parser is to fill in the mg_ehand |
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* array with handlers for each entity you know how to handle. |
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* Then, call mg_init to fill in the rest. This function will report |
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* an error and quit if you try to support an inconsistent set of entities. |
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* For each file you want to parse, call mg_load with the file name. |
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* To read from standard input, use NULL as the file name. |
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* For additional control over error reporting and file management, |
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* use mg_open, mg_read, mg_parse and mg_close instead of mg_load. |
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* To pass an entity of your own construction to the parser, use |
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* the mg_handle function rather than the mg_ehand routines directly. |
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* (The first argument to mg_handle is the entity #, or -1.) |
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* To free any data structures and clear the parser, use mg_clear. |
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* If there is an error, mg_load, mg_open, mg_parse, mg_handle and |
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* mg_fgoto will return an error from the list above. In addition, |
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* mg_load will report the error to stderr. The mg_read routine |
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* returns 0 when the end of file has been reached. |
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*/ |
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#define MG_MAXLINE 4096 /* maximum input line length */ |
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#define MG_MAXARGC (MG_MAXLINE/4) /* maximum argument count */ |
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typedef struct mg_fctxt { |
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char fname[96]; /* file name */ |
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FILE *fp; /* stream pointer */ |
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int fid; /* unique file context id */ |
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char inpline[MG_MAXLINE]; /* input line */ |
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int lineno; /* line number */ |
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struct mg_fctxt *prev; /* previous context */ |
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} MG_FCTXT; |
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typedef struct { |
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int fid; /* file this position is for */ |
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int lineno; /* line number in file */ |
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long offset; /* offset from beginning */ |
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} MG_FPOS; |
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extern MG_FCTXT *mg_file; /* current file context */ |
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extern void mg_init(void); /* fill in mg_ehand array */ |
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extern int mg_load(char *); /* parse a file */ |
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extern int mg_open(MG_FCTXT *, char *); /* open new input file */ |
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extern int mg_read(void); /* read next line */ |
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extern int mg_parse(void); /* parse current line */ |
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extern void mg_fgetpos(MG_FPOS *); /* get position on input file */ |
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extern int mg_fgoto(MG_FPOS *); /* go to position on input file */ |
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extern void mg_close(void); /* close input file */ |
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extern void mg_clear(void); /* clear parser */ |
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extern int mg_handle(int, int, char **); /* handle an entity */ |
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#ifndef MG_NQCD |
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#define MG_NQCD 5 /* default number of divisions */ |
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#endif |
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extern int mg_nqcdivs; /* divisions per quarter circle */ |
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/* |
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* The following library routines are included for your convenience: |
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*/ |
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extern int mg_entity(char *); /* get entity number from its name */ |
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extern int isint(char *); /* non-zero if integer format */ |
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extern int isintd(char *, char *); /* same with delimiter set */ |
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extern int isflt(char *); /* non-zero if floating point format */ |
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extern int isfltd(char *, char *); /* same with delimiter set */ |
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extern int isname(char *); /* non-zero if legal identifier name */ |
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extern int badarg(int, char **, char *);/* check argument format */ |
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extern int e_include(int, char **); /* expand include entity */ |
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extern int e_pipe(int, char **); /* expand piped command */ |
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extern int e_sph(int, char **); /* expand sphere as other entities */ |
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extern int e_torus(int, char **); /* expand torus as other entities */ |
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extern int e_cyl(int, char **); /* expand cylinder as other entities */ |
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extern int e_ring(int, char **); /* expand ring as other entities */ |
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extern int e_cone(int, char **); /* expand cone as other entities */ |
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extern int e_prism(int, char **); /* expand prism as other entities */ |
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extern int e_faceh(int, char **); /* expand face w/ holes as face */ |
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/************************************************************************ |
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* Definitions for 3-d vector manipulation functions |
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*/ |
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#define is0vect(v) (DOT(v,v) <= FTINY*FTINY) |
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#define round0(x) if (x <= FTINY && x >= -FTINY) x = 0 |
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/************************************************************************ |
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* Definitions for context handling routines |
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* (materials, colors, vectors) |
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*/ |
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#define C_1SIDEDTHICK 0.005 /* assumed thickness of 1-sided mat. */ |
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typedef struct { |
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int clock; /* incremented each change -- resettable */ |
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void *client_data; /* pointer to private client-owned data */ |
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int sided; /* 1 if surface is 1-sided, 0 for 2-sided */ |
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float nr, ni; /* index of refraction, real and imaginary */ |
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float rd; /* diffuse reflectance */ |
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C_COLOR rd_c; /* diffuse reflectance color */ |
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float td; /* diffuse transmittance */ |
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C_COLOR td_c; /* diffuse transmittance color */ |
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float ed; /* diffuse emittance */ |
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C_COLOR ed_c; /* diffuse emittance color */ |
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float rs; /* specular reflectance */ |
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C_COLOR rs_c; /* specular reflectance color */ |
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float rs_a; /* specular reflectance roughness */ |
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float ts; /* specular transmittance */ |
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C_COLOR ts_c; /* specular transmittance color */ |
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float ts_a; /* specular transmittance roughness */ |
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} C_MATERIAL; /* material context */ |
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typedef struct { |
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int clock; /* incremented each change -- resettable */ |
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void *client_data; /* pointer to private client-owned data */ |
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FVECT p, n; /* point and normal */ |
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} C_VERTEX; /* vertex context */ |
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#define C_DEFMATERIAL {1,NULL,0,1.,0.,0.,C_DEFCOLOR,0.,C_DEFCOLOR,0.,\ |
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C_DEFCOLOR,0.,C_DEFCOLOR,0.,0.,C_DEFCOLOR,0.} |
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#define C_DEFVERTEX {1,NULL,{0.,0.,0.},{0.,0.,0.}} |
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extern C_COLOR *c_ccolor; /* the current color */ |
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extern char *c_ccname; /* current color name */ |
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extern C_MATERIAL *c_cmaterial; /* the current material */ |
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extern char *c_cmname; /* current material name */ |
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extern C_VERTEX *c_cvertex; /* the current vertex */ |
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extern char *c_cvname; /* current vertex name */ |
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extern int c_hcolor(int, char **); /* handle color entity */ |
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extern int c_hmaterial(int, char **); /* handle material entity */ |
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extern int c_hvertex(int, char **); /* handle vertex entity */ |
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extern void c_clearall(void); /* clear context tables */ |
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extern C_MATERIAL *c_getmaterial(char *); /* get a named material */ |
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extern C_VERTEX *c_getvert(char *); /* get a named vertex */ |
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extern C_COLOR *c_getcolor(char *); /* get a named color */ |
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/************************************************************************* |
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* Definitions for hierarchical object name handler |
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*/ |
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extern int obj_nnames; /* depth of name hierarchy */ |
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extern char **obj_name; /* names in hierarchy */ |
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extern int obj_handler(int, char **); /* handle an object entity */ |
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extern void obj_clear(void); /* clear object stack */ |
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/************************************************************************** |
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* Definitions for hierarchical transformation handler |
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*/ |
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#define identxf(xp) (void)(setident4((xp)->xfm),(xp)->sca=1.0) |
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#define XF_MAXDIM 8 /* maximum array dimensions */ |
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struct xf_array { |
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MG_FPOS spos; /* starting position on input */ |
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int ndim; /* number of array dimensions */ |
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struct { |
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short i, n; /* current count and maximum */ |
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char arg[8]; /* string argument value */ |
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} aarg[XF_MAXDIM]; |
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}; |
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typedef struct xf_spec { |
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long xid; /* unique transform id */ |
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short xac; /* context argument count */ |
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short rev; /* boolean true if vertices reversed */ |
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XF xf; /* cumulative transformation */ |
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struct xf_array *xarr; /* transformation array pointer */ |
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struct xf_spec *prev; /* previous transformation context */ |
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} XF_SPEC; /* followed by argument buffer */ |
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extern XF_SPEC *xf_context; /* current transform context */ |
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extern char **xf_argend; /* last transform argument */ |
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#define xf_ac(xf) ((xf)==NULL ? 0 : (xf)->xac) |
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#define xf_av(xf) (xf_argend - (xf)->xac) |
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#define xf_argc xf_ac(xf_context) |
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#define xf_argv xf_av(xf_context) |
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/* |
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* The transformation handler should do most of the work that needs |
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* doing. Just pass it any xf entities, then use the associated |
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* functions to transform and translate points, transform vectors |
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* (without translation), rotate vectors (without scaling) and scale |
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* values appropriately. |
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* |
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* The routines xf_xfmpoint, xf_xfmvect and xf_rotvect take two |
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* 3-D vectors (which may be identical), transforms the second and |
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* puts the result into the first. |
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*/ |
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extern int xf_handler(int, char **); /* handle xf entity */ |
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extern void xf_xfmpoint(FVECT, FVECT); /* transform point */ |
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extern void xf_xfmvect(FVECT, FVECT); /* transform vector */ |
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extern void xf_rotvect(FVECT, FVECT); /* rotate vector */ |
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extern double xf_scale(double); /* scale a value */ |
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extern void xf_clear(void); /* clear xf stack */ |
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/* The following are support routines you probably won't call directly */ |
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XF_SPEC *new_xf(int, char **); /* allocate new transform */ |
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void free_xf(XF_SPEC *); /* free a transform */ |
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int xf_aname(struct xf_array *); /* name this instance */ |
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long comp_xfid(MAT4); /* compute unique ID */ |
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extern void multmat4(MAT4, MAT4, MAT4); /* m4a = m4b X m4c */ |
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extern void multv3(FVECT, FVECT, MAT4); /* v3a = v3b X m4 (vectors) */ |
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extern void multp3(FVECT, FVECT, MAT4); /* p3a = p3b X m4 (points) */ |
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extern int xf(XF *, int, char **); /* interpret transform spec. */ |
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/* cvrgb.c */ |
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extern void mgf2rgb(C_COLOR *cin, double intensity, float cout[3]); |
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/************************************************************************ |
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* Miscellaneous definitions |
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*/ |
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#ifdef __cplusplus |
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} |
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#endif |
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#endif /* _MGF_PARSER_H_ */ |
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