1 /* lsys.h
    2  *      Header file for L-system code.
    3  *      Nicholas Wilt, 6/26/93.
    4  */
    5 
    6 #ifndef LSYS_H
    7 #define LSYS_H
    8 
    9 
   10 #define size    ssize
   11 /* Needed for use of asm -- helps decide which pointer to function
   12  * to put into the struct lsys_cmds.
   13  */
   14 
   15 /* Macro to take an FP number and turn it into a
   16  * 16/16-bit fixed-point number.
   17  */
   18 #define FIXEDMUL        524288L
   19 #define FIXEDPT(x)      ((long) (FIXEDMUL * (x)))
   20 
   21 /* The number by which to multiply sines, cosines and other
   22  * values with magnitudes less than or equal to 1.
   23  * sins and coss are a 3/29 bit fixed-point scheme (so the
   24  * range is +/- 2, with good accuracy.  The range is to
   25  * avoid overflowing when the aspect ratio is taken into
   26  * account.
   27  */
   28 #define FIXEDLT1        536870912.0
   29 
   30 #define ANGLE2DOUBLE    (2.0*PI / 4294967296.0)
   31 
   32 #define MAXRULES 27 /* this limits rules to 25 */
   33 #define MAX_LSYS_LINE_LEN 255 /* this limits line length to 255 */
   34 
   35 struct lsys_turtlestatei {
   36     char counter, angle, reverse, stackoflow;
   37     /* dmaxangle is maxangle - 1 */
   38     char maxangle, dmaxangle, curcolor, dummy;  /* dummy ensures longword alignment */
   39     long size;
   40     long realangle;
   41     long xpos, ypos; /* xpos and ypos are long, not fixed point */
   42     long xmin, ymin, xmax, ymax; /* as are these */
   43     long aspect; /* aspect ratio of each pixel, ysize/xsize */
   44     long num;
   45 };
   46 
   47 struct lsys_turtlestatef {
   48     char counter, angle, reverse, stackoflow;
   49     /* dmaxangle is maxangle - 1 */
   50     char maxangle, dmaxangle, curcolor, dummy;  /* dummy ensures longword alignment */
   51     LDBL size;
   52     LDBL realangle;
   53     LDBL xpos, ypos;
   54     LDBL xmin, ymin, xmax, ymax;
   55     LDBL aspect; /* aspect ratio of each pixel, ysize/xsize */
   56     union {
   57         long n;
   58         LDBL nf;
   59     } parm;
   60 };
   61 
   62 extern char maxangle;
   63 
   64 /* routines in lsysa.asm */
   65 
   66 #ifdef XFRACT
   67 #define lsysi_doat_386 lsys_doat
   68 #define lsysi_dosizegf_386 lsys_dosizegf
   69 #define lsysi_dodrawg_386 lsys_dodrawg
   70 #else
   71 extern void lsysi_doat_386(struct lsys_turtlestatei *cmd);
   72 extern void lsysi_dosizegf_386(struct lsys_turtlestatei *cmd);
   73 extern void lsysi_dodrawg_386(struct lsys_turtlestatei *cmd);
   74 #endif
   75 
   76 /* routines in lsysaf.asm */
   77 
   78 extern void lsys_prepfpu(struct lsys_turtlestatef *);
   79 extern void lsys_donefpu(struct lsys_turtlestatef *);
   80 
   81 /* routines in lsysf.c */
   82 
   83 extern struct lsys_cmd far * _fastcall drawLSysF(struct lsys_cmd far *command,struct lsys_turtlestatef *ts, struct lsys_cmd far **rules,int depth);
   84 extern int _fastcall lsysf_findscale(struct lsys_cmd far *command, struct lsys_turtlestatef *ts, struct lsys_cmd far **rules, int depth);
   85 extern struct lsys_cmd far *LSysFSizeTransform(char far *s, struct lsys_turtlestatef *ts);
   86 extern struct lsys_cmd far *LSysFDrawTransform(char far *s, struct lsys_turtlestatef *ts);
   87 extern void _fastcall lsysf_dosincos(void);
   88 
   89 #endif
   90