1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
|
/*
* 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
|
