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/* Copyright (c) 1994 Regents of the University of California */ |
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|
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/* SCCSid "$SunId$ LBL" */ |
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|
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/* |
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* Header file for MGF interpreter |
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*/ |
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|
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/* must include stdio.h before us */ |
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|
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/* Entities (order doesn't really matter) */ |
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#define MG_E_COMMENT 0 |
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#define MG_E_COLOR 1 |
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#define MG_E_CONE 2 |
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#define MG_E_CXY 3 |
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#define MG_E_CYL 4 |
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#define MG_E_ED 5 |
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#define MG_E_FACE 6 |
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#define MG_E_INCLUDE 7 |
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#define MG_E_IES 8 |
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#define MG_E_MATERIAL 9 |
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#define MG_E_NORMAL 10 |
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#define MG_E_OBJECT 11 |
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#define MG_E_POINT 12 |
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#define MG_E_RD 13 |
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#define MG_E_RING 14 |
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#define MG_E_RS 15 |
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#define MG_E_SPH 16 |
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#define MG_E_TD 17 |
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#define MG_E_TORUS 18 |
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#define MG_E_TS 19 |
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#define MG_E_VERTEX 20 |
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#define MG_E_XF 21 |
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|
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#define MG_NENTITIES 22 |
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|
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#define MG_NAMELIST {"#","c","cone","cxy","cyl","ed","f","i","ies",\ |
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"m","n","o","p","rd","ring","rs","sph","td","torus","ts","v","xf"} |
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|
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#define MG_MAXELEN 6 |
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|
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extern char mg_ename[MG_NENTITIES][MG_MAXELEN]; |
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|
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/* Handler routines for each entity */ |
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|
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#ifdef NOPROTO |
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extern int (*mg_ehand[MG_NENTITIES])(); |
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#else |
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extern int (*mg_ehand[MG_NENTITIES])(int argc, char **argv); |
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#endif |
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|
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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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|
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#define MG_NERRS 11 |
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|
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extern char *mg_err[MG_NERRS]; |
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|
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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 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, and mg_rewind |
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* will return an error from the list above. In addition, mg_load |
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* will report the error to stderr. The mg_read routine returns 0 |
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* when the end of file has been reached. |
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*/ |
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|
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#define MG_MAXLINE 512 /* maximum input line length */ |
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#define MG_MAXARGC (MG_MAXLINE/4) /* maximum argument count */ |
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|
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typedef struct mg_fctxt { |
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char *fname; /* file name */ |
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FILE *fp; /* stream pointer */ |
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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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|
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extern MG_FCTXT *mg_file; /* current file context */ |
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|
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#ifdef NOPROTO |
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extern void mg_init(); /* fill in mg_ehand array */ |
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extern int mg_load(); /* parse a file */ |
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extern int mg_open(); /* open new input file */ |
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extern int mg_read(); /* read next line */ |
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extern int mg_parse(); /* parse current line */ |
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extern int mg_rewind(); /* rewind input file */ |
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extern void mg_close(); /* close input file */ |
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extern void mg_clear(); /* clear parser */ |
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extern int mg_iterate(); |
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#else |
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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 int mg_rewind(void); /* rewind 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_iterate(int, char **, int (*)(void)); |
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#endif |
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|
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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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|
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extern int mg_nqcdivs; /* divisions per quarter circle */ |
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|
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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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|
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#ifdef NOPROTO |
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extern int mg_entity(); /* get entity number from its name */ |
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extern int isint(); /* non-zero if integer format */ |
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extern int isflt(); /* non-zero if floating point format */ |
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#else |
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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 isflt(char *); /* non-zero if floating point format */ |
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#endif |
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|
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/************************************************************************ |
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* Definitions for 3-d vector manipulation functions |
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*/ |
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|
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#ifdef SMLFLT |
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#define FLOAT float |
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#define FTINY (1e-3) |
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#else |
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#define FLOAT double |
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#define FTINY (1e-6) |
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#endif |
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#define FHUGE (1e10) |
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|
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typedef FLOAT FVECT[3]; |
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|
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#define VCOPY(v1,v2) ((v1)[0]=(v2)[0],(v1)[1]=(v2)[1],(v1)[2]=(v2)[2]) |
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#define DOT(v1,v2) ((v1)[0]*(v2)[0]+(v1)[1]*(v2)[1]+(v1)[2]*(v2)[2]) |
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#define VSUM(vr,v1,v2,f) ((vr)[0]=(v1)[0]+(f)*(v2)[0], \ |
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(vr)[1]=(v1)[1]+(f)*(v2)[1], \ |
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(vr)[2]=(v1)[2]+(f)*(v2)[2]) |
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|
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#define is0vect(v) (DOT(v,v) < FTINY*FTINY) |
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|
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#define round0(x) if (x <= FTINY && x >= -FTINY) x = 0 |
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|
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#ifdef NOPROTO |
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extern double normalize(); /* normalize a vector */ |
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#else |
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extern double normalize(FVECT); /* normalize a vector */ |
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#endif |
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|
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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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|
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typedef struct { |
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float cx, cy; /* XY chromaticity coordinates */ |
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} C_COLOR; /* color context */ |
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|
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typedef struct { |
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char *name; /* material name */ |
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int clock; /* incremented each change -- resettable */ |
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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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|
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typedef struct { |
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FVECT p, n; /* point and normal */ |
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} C_VERTEX; /* vertex context */ |
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|
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#define isgrey(cxy) ((cxy)->cx > .31 && (cxy)->cx < .35 && \ |
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(cxy)->cy > .31 && (cxy)->cy < .35) |
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|
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#define C_DEFCOLOR {.333,.333} |
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#define C_DEFMATERIAL {NULL,1,0.,C_DEFCOLOR,0.,C_DEFCOLOR,0.,C_DEFCOLOR,\ |
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0.,C_DEFCOLOR,0.,0.,C_DEFCOLOR,0.} |
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#define C_DEFVERTEX {{0.,0.,0.},{0.,0.,0.}} |
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extern C_COLOR *c_ccolor; /* the current color */ |
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extern C_MATERIAL *c_cmaterial; /* the current material */ |
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extern C_VERTEX *c_cvertex; /* the current vertex */ |
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#ifdef NOPROTO |
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extern int c_hcolor(); /* handle color entity */ |
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extern int c_hmaterial(); /* handle material entity */ |
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extern int c_hvertex(); /* handle vertex entity */ |
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extern void c_clearall(); /* clear context tables */ |
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extern C_VERTEX *c_getvert(); /* get a named vertex */ |
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#else |
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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_VERTEX *c_getvert(char *); /* get a named vertex */ |
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#endif |
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|
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/************************************************************************* |
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* Definitions for hierarchical object name handler |
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*/ |
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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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|
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#ifdef NOPROTO |
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extern int obj_handler(); /* handle an object entity */ |
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extern void obj_clear(); /* clear object stack */ |
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#else |
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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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#endif |
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|
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/************************************************************************** |
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* Definitions for hierarchical transformation handler |
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*/ |
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|
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typedef FLOAT MAT4[4][4]; |
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|
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#ifdef BSD |
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#define copymat4(m4a,m4b) bcopy((char *)m4b,(char *)m4a,sizeof(MAT4)) |
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#else |
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#define copymat4(m4a,m4b) (void)memcpy((char *)m4a,(char *)m4b,sizeof(MAT4)) |
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extern char *memcpy(); |
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#endif |
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|
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#define MAT4IDENT { {1.,0.,0.,0.}, {0.,1.,0.,0.}, \ |
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{0.,0.,1.,0.}, {0.,0.,0.,1.} } |
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|
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extern MAT4 m4ident; |
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|
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#define setident4(m4) copymat4(m4, m4ident) |
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|
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/* regular transformation */ |
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typedef struct { |
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MAT4 xfm; /* transform matrix */ |
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FLOAT sca; /* scalefactor */ |
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} XF; |
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|
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#define identxf(xp) (void)(setident4((xp)->xfm),(xp)->sca=1.0) |
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|
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typedef struct xf_spec { |
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short xac; /* transform argument count */ |
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short xav0; /* zeroeth argument in xf_argv array */ |
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XF xf; /* cumulative transformation */ |
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struct xf_spec *prev; /* previous transformation context */ |
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} XF_SPEC; |
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|
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extern int xf_argc; /* total # transform args. */ |
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extern char **xf_argv; /* transform arguments */ |
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extern XF_SPEC *xf_context; /* current context */ |
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|
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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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|
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#ifdef NOPROTO |
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|
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extern int xf_handler(); /* handle xf entity */ |
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extern void xf_xfmpoint(); /* transform point */ |
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extern void xf_xfmvect(); /* transform vector */ |
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extern void xf_rotvect(); /* rotate vector */ |
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extern double xf_scale(); /* scale a value */ |
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extern void xf_clear(); /* clear xf stack */ |
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|
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/* The following are support routines you probably won't call directly */ |
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|
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extern void multmat4(); /* m4a = m4b X m4c */ |
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extern void multv3(); /* v3a = v3b X m4 (vectors) */ |
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extern void multp3(); /* p3a = p3b X m4 (points) */ |
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extern int xf(); /* interpret transform spec. */ |
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|
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#else |
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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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|
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/* The following are support routines you probably won't call directly */ |
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|
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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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|
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#endif |
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|
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/************************************************************************ |
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* Miscellaneous definitions |
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*/ |
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|
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#ifdef M_PI |
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#define PI M_PI |
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#else |
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#define PI 3.14159265358979323846 |
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#endif |
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|
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#ifdef DCL_ATOF |
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extern double atof(); |
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#endif |
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|
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#ifndef MEM_PTR |
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#define MEM_PTR void * |
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#endif |
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|
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extern MEM_PTR malloc(); |
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extern MEM_PTR calloc(); |
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extern MEM_PTR realloc(); |
