/*

 * tube_gc.h

 *

 * FUNCTION:

 * This file allows for easy changes to changes in the way the extrusion

 * library handles state info (i.e. context).

 *

 * HISTORY:

 * Linas Vepstas --- February 1993

 * Added auto texture coord generation hacks, Linas April 1994

 * Added tube.h include to define gleDouble, tad February 2002

 */

#include "tube.h"

#include "port.h" /* for gleVector */

typedef float gleColor[3];

typedef double gleTwoVec[2];

typedef struct {

   /* public methods */

   void (*bgn_gen_texture) (int, double);

   void (*n3f_gen_texture) (float *);

   void (*n3d_gen_texture) (double *);

   void (*v3f_gen_texture) (float *, int, int);

   void (*v3d_gen_texture) (double *, int, int);

   void (*end_gen_texture) (void);

   /* protected members -- "general knowledge" stuff */

   int join_style;

   /* arguments passed into extrusion code */ 

   int ncp;     /* number of contour points */

   gleTwoVec *contour;    /* 2D contour */

   gleTwoVec *cont_normal;  /* 2D contour normals */

   gleDouble *up;               /* up vector */

   int npoints;  /* number of points in polyline */

   gleVector *point_array;     /* path */

   gleColor *color_array;         /* path colors */

   gleAffine *xform_array;  /* contour xforms */

   /* private members, used by texturing code */

   int num_vert;

   int segment_number;

   double segment_length;

   double accum_seg_len;

   double prev_x;

   double prev_y;

   void (*save_bgn_gen_texture) (int, double);

   void (*save_n3f_gen_texture) (float *);

   void (*save_n3d_gen_texture) (double *);

   void (*save_v3f_gen_texture) (float *, int, int);

   void (*save_v3d_gen_texture) (double *, int, int);

   void (*save_end_gen_texture) (void);

} gleGC;

extern gleGC *_gle_gc;

extern gleGC * gleCreateGC (void);

#define INIT_GC() {if (!_gle_gc) _gle_gc = gleCreateGC(); }

#define extrusion_join_style (_gle_gc->join_style)

#define __TUBE_CLOSE_CONTOUR (extrusion_join_style & TUBE_CONTOUR_CLOSED)

#define __TUBE_DRAW_CAP (extrusion_join_style & TUBE_JN_CAP)

#define __TUBE_DRAW_FACET_NORMALS (extrusion_join_style & TUBE_NORM_FACET)

#define __TUBE_DRAW_PATH_EDGE_NORMALS (extrusion_join_style & TUBE_NORM_PATH_EDGE)

#define __TUBE_STYLE (extrusion_join_style & TUBE_JN_MASK)

#define __TUBE_RAW_JOIN (extrusion_join_style & TUBE_JN_RAW)

#define __TUBE_CUT_JOIN (extrusion_join_style & TUBE_JN_CUT)

#define __TUBE_ANGLE_JOIN (extrusion_join_style & TUBE_JN_ANGLE)

#define __TUBE_ROUND_JOIN (extrusion_join_style & TUBE_JN_ROUND)

/* ======================= END OF FILE ========================== */