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/* $Id: nurbs.h,v 1.2 2003-08-22 20:11:43 brianp Exp $ */
/*
* Mesa 3-D graphics library
* Version: 3.3
* Copyright (C) 1995-2000 Brian Paul
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* NURBS implementation written by Bogdan Sikorski (bogdan@cira.it)
* See README2 for more info.
*/
#ifndef NURBS_H
#define NURBS_H
#define EPSILON 1e-06 /* epsilon for double precision compares */
typedef enum
{
GLU_NURBS_CURVE, GLU_NURBS_SURFACE, GLU_NURBS_TRIM, GLU_NURBS_NO_TRIM,
GLU_NURBS_TRIM_DONE, GLU_NURBS_NONE
}
GLU_nurbs_enum;
typedef enum
{
GLU_TRIM_NURBS, GLU_TRIM_PWL
}
GLU_trim_enum;
typedef struct
{
GLint sknot_count;
GLfloat *sknot;
GLint tknot_count;
GLfloat *tknot;
GLint s_stride;
GLint t_stride;
GLfloat *ctrlarray;
GLint sorder;
GLint torder;
GLint dim;
GLenum type;
}
surface_attribs;
typedef struct
{
surface_attribs geom;
surface_attribs color;
surface_attribs texture;
surface_attribs normal;
}
nurbs_surface;
typedef struct
{
GLint knot_count;
GLfloat *knot;
GLint stride;
GLfloat *ctrlarray;
GLint order;
GLint dim;
GLenum type;
}
curve_attribs;
typedef struct
{
GLint pt_count;
GLfloat *ctrlarray;
GLint stride;
GLint dim;
GLenum type;
}
pwl_curve_attribs;
typedef struct
{
curve_attribs geom;
curve_attribs color;
curve_attribs texture;
curve_attribs normal;
}
nurbs_curve;
typedef struct trim_list_str
{
GLU_trim_enum trim_type;
union
{
pwl_curve_attribs pwl_curve;
curve_attribs nurbs_curve;
}
curve;
struct trim_list_str *next;
}
trim_list;
typedef struct seg_trim_str
{
GLfloat *points;
GLint pt_cnt, seg_array_len;
struct seg_trim_str *next;
}
trim_segments;
typedef struct nurbs_trim_str
{
trim_list *trim_loop;
trim_segments *segments;
struct nurbs_trim_str *next;
}
nurbs_trim;
typedef struct
{
GLfloat model[16], proj[16], viewport[4];
}
culling_and_sampling_str;
struct GLUnurbs
{
GLboolean culling;
GLenum error;
void (GLCALLBACK * error_callback) (GLenum err);
GLenum display_mode;
GLU_nurbs_enum nurbs_type;
GLboolean auto_load_matrix;
culling_and_sampling_str sampling_matrices;
GLenum sampling_method;
GLfloat sampling_tolerance;
GLfloat parametric_tolerance;
GLint u_step, v_step;
nurbs_surface surface;
nurbs_curve curve;
nurbs_trim *trim;
};
typedef struct
{
GLfloat *knot;
GLint nknots;
GLfloat *unified_knot;
GLint unified_nknots;
GLint order;
GLint t_min, t_max;
GLint delta_nknots;
GLboolean open_at_begin, open_at_end;
GLfloat *new_knot;
GLfloat *alpha;
}
knot_str_type;
typedef struct
{
GLfloat *geom_ctrl;
GLint geom_s_stride, geom_t_stride;
GLfloat **geom_offsets;
GLint geom_s_pt_cnt, geom_t_pt_cnt;
GLfloat *color_ctrl;
GLint color_s_stride, color_t_stride;
GLfloat **color_offsets;
GLint color_s_pt_cnt, color_t_pt_cnt;
GLfloat *normal_ctrl;
GLint normal_s_stride, normal_t_stride;
GLfloat **normal_offsets;
GLint normal_s_pt_cnt, normal_t_pt_cnt;
GLfloat *texture_ctrl;
GLint texture_s_stride, texture_t_stride;
GLfloat **texture_offsets;
GLint texture_s_pt_cnt, texture_t_pt_cnt;
GLint s_bezier_cnt, t_bezier_cnt;
}
new_ctrl_type;
extern void call_user_error(GLUnurbsObj * nobj, GLenum error);
extern GLenum test_knot(GLint nknots, GLfloat * knot, GLint order);
extern GLenum explode_knot(knot_str_type * the_knot);
extern GLenum calc_alphas(knot_str_type * the_knot);
extern GLenum calc_new_ctrl_pts(GLfloat * ctrl, GLint stride,
knot_str_type * the_knot, GLint dim,
GLfloat ** new_ctrl, GLint * ncontrol);
extern GLenum glu_do_sampling_crv(GLUnurbsObj * nobj, GLfloat * new_ctrl,
GLint n_ctrl, GLint order, GLint dim,
GLint ** factors);
extern GLenum glu_do_sampling_3D(GLUnurbsObj * nobj, new_ctrl_type * new_ctrl,
int **sfactors, GLint ** tfactors);
extern GLenum glu_do_sampling_uv(GLUnurbsObj * nobj, new_ctrl_type * new_ctrl,
int **sfactors, GLint ** tfactors);
extern GLenum glu_do_sampling_param_3D(GLUnurbsObj * nobj,
new_ctrl_type * new_ctrl,
int **sfactors, GLint ** tfactors);
extern GLboolean fine_culling_test_2D(GLUnurbsObj * nobj, GLfloat * ctrl,
GLint n_ctrl, GLint stride, GLint dim);
extern GLboolean fine_culling_test_3D(GLUnurbsObj * nobj, GLfloat * ctrl,
GLint s_n_ctrl, GLint t_n_ctrl,
GLint s_stride, GLint t_stride,
GLint dim);
extern void do_nurbs_curve(GLUnurbsObj * nobj);
extern void do_nurbs_surface(GLUnurbsObj * nobj);
extern GLenum patch_trimming(GLUnurbsObj * nobj, new_ctrl_type * new_ctrl,
GLint * sfactors, GLint * tfactors);
extern void collect_unified_knot(knot_str_type * dest, knot_str_type * src,
GLfloat maximal_min_knot,
GLfloat minimal_max_knot);
extern GLenum select_knot_working_range(GLUnurbsObj * nobj,
knot_str_type * geom_knot,
knot_str_type * color_knot,
knot_str_type * normal_knot,
knot_str_type * texture_knot);
extern void free_unified_knots(knot_str_type * geom_knot,
knot_str_type * color_knot,
knot_str_type * normal_knot,
knot_str_type * texture_knot);
#endif
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