summaryrefslogtreecommitdiff
path: root/src/glu/sgi/libnurbs/internals/subdivider.h
blob: 4d539518186041a61aa8a7415c28b25a9b742d58 (plain)
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
/*
 * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
 * Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice including the dates of first publication and
 * either this permission notice or a reference to
 * http://oss.sgi.com/projects/FreeB/
 * shall be included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
 * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * Except as contained in this notice, the name of Silicon Graphics, Inc.
 * shall not be used in advertising or otherwise to promote the sale, use or
 * other dealings in this Software without prior written authorization from
 * Silicon Graphics, Inc.
 */

/*
 * subdivider.h
 *
 */

#ifndef __glusubdivider_h_
#define __glusubdivider_h_

#include "mysetjmp.h"
#include "bin.h"
#include "flist.h"
#include "slicer.h"
#include "arctess.h"
#include "trimvertex.h"
#include "trimvertpool.h"

class Arc;
class Pool;
class Renderhints;
class Quilt;
class Patchlist;
class Curvelist;
struct JumpBuffer;

class Subdivider {
public:
			Subdivider( Renderhints&, Backend& );
			~Subdivider( void );
    void		clear( void );

    void		beginTrims( void ) {}
    void		beginLoop( void );
    void		addArc( REAL *, Quilt *, long );
    void		addArc( int, TrimVertex *, long );
    void		endLoop( void ) {}
    void		endTrims( void ) {}

    void		beginQuilts( void );
    void		addQuilt( Quilt * );
    void		endQuilts( void ) {}

    void		drawCurves( void );
    void		drawSurfaces( long );

    int			ccwTurn_sl( Arc_ptr, Arc_ptr  );
    int			ccwTurn_sr( Arc_ptr , Arc_ptr   );
    int			ccwTurn_tl( Arc_ptr , Arc_ptr  );
    int			ccwTurn_tr( Arc_ptr , Arc_ptr  );

    void		setJumpbuffer( JumpBuffer * );

    void set_domain_distance_u_rate(REAL u_rate)
      {
	domain_distance_u_rate = u_rate;
      }
    void set_domain_distance_v_rate(REAL v_rate)
      {
	domain_distance_v_rate = v_rate;
      }
    void set_is_domain_distance_sampling(int flag)
      {
	is_domain_distance_sampling = flag;
      }

private:
    void		classify_headonleft_s( Bin &, Bin &, Bin &, REAL );
    void		classify_tailonleft_s( Bin &, Bin &, Bin &, REAL );
    void		classify_headonright_s( Bin &, Bin &, Bin &, REAL );
    void		classify_tailonright_s( Bin &, Bin &, Bin &, REAL );
    void		classify_headonleft_t( Bin &, Bin &, Bin &, REAL );
    void		classify_tailonleft_t( Bin &, Bin &, Bin &, REAL );
    void		classify_headonright_t( Bin &, Bin &, Bin &, REAL );
    void		classify_tailonright_t( Bin &, Bin &, Bin &, REAL );

    enum dir 		{ down, same, up, none };
    void		tessellate( Arc_ptr, REAL );
    void		monotonize( Arc_ptr , Bin & );
    int			isMonotone( Arc_ptr  );
    int			decompose( Bin &, REAL );


    Slicer		slicer;
    ArcTessellator	arctessellator;
    Pool		arcpool;
    Pool		bezierarcpool;
    Pool		pwlarcpool;
    TrimVertexPool	trimvertexpool;

    JumpBuffer*		jumpbuffer;
    Renderhints&	renderhints;
    Backend&		backend;

    Bin			initialbin;
    Arc_ptr		pjarc;
    int 		s_index;
    int			t_index;
    Quilt *		qlist;
    Flist		spbrkpts;
    Flist		tpbrkpts;
    Flist		smbrkpts;
    Flist		tmbrkpts;
    REAL	 	stepsizes[4];
    int			showDegenerate;
    int			isArcTypeBezier;

    void		samplingSplit( Curvelist&, int );

    void		subdivideInS( Bin&  );
    void		splitInS( Bin&, int, int );
    void		splitInT( Bin&, int, int );
    void		samplingSplit( Bin&, Patchlist&, int, int );
    void		nonSamplingSplit( Bin&, Patchlist&, int, int );
    void		tessellation( Bin&, Patchlist& );
    void		monosplitInS( Bin&, int, int );
    void		monosplitInT( Bin&, int, int );

    void		outline( Bin & );
    void		freejarcs( Bin & );
    void		render( Bin & );
    void		split( Bin &, Bin &, Bin &, int, REAL );
    void		tessellate( Bin &, REAL, REAL, REAL, REAL );

    inline void		setDegenerate( void ) { showDegenerate = 1; }
    inline void		setNonDegenerate( void ) { showDegenerate = 0; }
    inline int		showingDegenerate( void ) { return showDegenerate; }
    inline void		setArcTypeBezier( void ) { isArcTypeBezier = 1; }
    inline void		setArcTypePwl( void ) { isArcTypeBezier = 0; }
    inline int		isBezierArcType( void ) { return isArcTypeBezier; }

    void		makeBorderTrim( const REAL *, const REAL * );
    void		split( Bin &, int, const REAL *, int, int );
    void		partition( Bin &, Bin &, Bin &, Bin &, Bin &, int, REAL );
    void		findIrregularS( Bin & );
    void		findIrregularT( Bin & );


    inline int		bbox( TrimVertex *, TrimVertex *, TrimVertex *, int );
    static int		bbox( REAL, REAL, REAL, REAL, REAL, REAL );
    static int		ccw( TrimVertex *, TrimVertex *, TrimVertex * );
    void		join_s( Bin &, Bin &, Arc_ptr, Arc_ptr  );
    void		join_t( Bin &, Bin &, Arc_ptr , Arc_ptr  );
    int			arc_split( Arc_ptr , int, REAL, int );
    void		check_s( Arc_ptr , Arc_ptr  );
    void		check_t( Arc_ptr , Arc_ptr  );
    inline void		link( Arc_ptr , Arc_ptr , Arc_ptr , Arc_ptr  );
    inline void		simple_link( Arc_ptr , Arc_ptr  );

   Bin*                 makePatchBoundary( const REAL *from, const REAL *to );

   /*in domain distance method, the tessellation is controled by two numbers:
    *GLU_U_STEP: number of u-segments per unit u length of domain
    *GLU_V_STEP: number of v-segments per unit v length of domain
    *These two numbers are normally stored in mapdesc->maxs(t)rate.
    *I (ZL) put these two numbers here so that I can optimize the untrimmed 
    *case in the case of domain distance sampling.
    *These two numbers are set by set_domain_distance_u_rate() and ..._v_..().
    */
   REAL domain_distance_u_rate;
   REAL domain_distance_v_rate;
   int is_domain_distance_sampling;
};

inline void
Subdivider::beginLoop( void ) 
{
    pjarc = 0;
}


#endif /* __glusubdivider_h_ */