Category : C Source Code
Archive   : POLY3DRS.ZIP
Filename : PARSER.H

/*****************************************************************************
* General definitions goes here: *
*****************************************************************************/

#ifndef PARSER_H
#define PARSER_H

#ifndef LINE_LEN
#define LINE_LEN 255
#endif LINE_LEN

#define NAME_LEN 6

#ifndef TRUE
#define TRUE -1
#define FALSE 0
#endif

#ifndef NULL
#define NULL 0
#endif

#define FILE_TYPE_DATA 1
#define FILE_TYPE_VIEW 2

#define UNGET_STACK_SIZE 5

/*****************************************************************************
* Tokens definitions goes into here *
*****************************************************************************/
#define TOKEN_OPEN_PAREN 1
#define TOKEN_CLOSE_PAREN 2

#define TOKEN_NUMBER 10 /* Not used as number & names are decoded */
/* according to their places in grammer. */
#define TOKEN_VERTEX 20
#define TOKEN_POLYGON 21
#define TOKEN_POLYLINE 22
#define TOKEN_OBJECT 23
#define TOKEN_COLOR 24
#define TOKEN_RGB 25
#define TOKEN_INTERNAL 26
#define TOKEN_PLANE 27
#define TOKEN_NORMAL 28

#define TOKEN_OTHER 100 /* Probably names & numbers. */
#define TOKEN_EOF -1

#define VERTEX_ENTRY 0x0001 /* Entry type, up to 16 types. */
#define POLYGON_ENTRY 0x0002
#define POLYLINE_ENTRY 0x0004
#define OBJECT_ENTRY 0x0008
#define COLOR_ENTRY 0x0010

/*****************************************************************************
* Parser error codes are following: *
*****************************************************************************/
#define P_ERR_NumberExpected 1
#define P_ERR_CloseParanExpected 2
#define P_ERR_ListCompUndef 3
#define P_ERR_UndefExprHeader 4

/*****************************************************************************
* And some more definitions ... *
*****************************************************************************/

typedef unsigned char Byte;

typedef struct BinTree { /* The entries are saved as binary trees. */
struct BinTree *right, *left; /* Classic, isnt it!? */
union {
VoidPtr PVoid;
struct VertexStruct *PVertex;
struct PolygonStruct *PPolygon;
struct PolygonStruct *PPolyline;
struct ObjectStruct *PObject;
} Data;
char Name[NAME_LEN];
Byte EntryType; /* Kind of pointer in union. */
Byte Used; /* TRUE if allready has been used (multi - referenced). */
} BinTree;

typedef struct FileDescription { /* Each data file loaded gets such struct. */
BinTree *VertexPointer, /* Pointers on the binary trees ... */
*PolygonPointer,
*PolylinePointer,
*ObjectPointer;
} FileDescription;

typedef struct ScanConvertStruct {
int MaxEdgeY; /* When this edge is no longer active. */
struct VertexStruct *VMinY, *VMaxY;/* Which vertices form this boundary. */
} ScanConvertStruct;

/* Use the following structure if linear list operations are to be performed */
/* on VertexStruct/PolygonStruct/ObjectStruct (Virtual functions...). */
typedef struct LinearListStruct {
struct LinearListStruct *Pnext;
} LinearListStruct;

typedef struct VertexStruct {
struct VertexStruct *Pnext;
int Color; /* RGB of vertex as extracted. */
float Coord[3]; /* The 3D coords. */
float Normal[3]; /* The 3D normal. */
Byte Transform;
Byte HasNormal;
} VertexStruct;

typedef struct PolygonStruct {
struct PolygonStruct *Pnext;
int Xmin, Xmax, Ymin, Ymax; /* Bounding box of the polygon. */
struct ScanConvertStruct Bndry1, Bndry2;
VertexStruct *PVertex; /* The polygon vertices. */
float Plane[4]; /* Plane equation of polygon plane. */
Byte FlipPlaneDir;
Byte Polyline;
} PolygonStruct;

typedef struct ObjectStruct {
struct ObjectStruct *Pnext;
PolygonStruct *PPolygon;
int Color; /* optionally if Color was def.. */
int RGBColor[3]; /* Or full RGB was specified. */
} ObjectStruct;

/* And function prototypes: */

FileDescription *GetDataFile(FILE *f);
void GetViewFile(FILE *f, int FileExists);
BinTree *GetBinTree(char *RecName, BinTree *Tree);

#endif PARSER_H