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/*
** License Applicability. Except to the extent portions of this file are
** made subject to an alternative license as permitted in the SGI Free
** Software License B, Version 1.1 (the "License"), the contents of this
** file are subject only to the provisions of the License. You may not use
** this file except in compliance with the License. You may obtain a copy
** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
**
** http://oss.sgi.com/projects/FreeB
**
** Note that, as provided in the License, the Software is distributed on an
** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
**
** Original Code. The Original Code is: OpenGL Sample Implementation,
** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
** Copyright in any portions created by third parties is as indicated
** elsewhere herein. All Rights Reserved.
**
** Additional Notice Provisions: The application programming interfaces
** established by SGI in conjunction with the Original Code are The
** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
** Window System(R) (Version 1.3), released October 19, 1998. This software
** was created using the OpenGL(R) version 1.2.1 Sample Implementation
** published by SGI, but has not been independently verified as being
** compliant with the OpenGL(R) version 1.2.1 Specification.
*/
/*
* 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_ */
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