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kicad/pcbnew/router/pns_diff_pair.h

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/*
* KiRouter - a push-and-(sometimes-)shove PCB router
*
* Copyright (C) 2013-2015 CERN
* Copyright (C) 2016-2021 KiCad Developers, see AUTHORS.txt for contributors.
* Author: Tomasz Wlostowski <tomasz.wlostowski@cern.ch>
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation, either version 3 of the License, or (at your
* option) any later version.
*
* This program 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __PNS_DIFF_PAIR_H
#define __PNS_DIFF_PAIR_H
#include <vector>
#include "pns_line.h"
#include "pns_via.h"
#include "pns_link_holder.h"
#include "ranged_num.h"
namespace PNS {
class DIFF_PAIR;
/**
* Define a "gateway" for routing a differential pair - e.g. a pair of points (anchors) with
* certain orientation, spacing and (optionally) predefined entry paths. The routing algorithm
* connects such gateways with parallel lines, thus creating a differential pair.
*/
class DP_GATEWAY
{
public:
DP_GATEWAY( const VECTOR2I& aAnchorP, const VECTOR2I& aAnchorN, bool aIsDiagonal,
int aAllowedEntryAngles = DIRECTION_45::ANG_OBTUSE, int aPriority = 0 ) :
m_anchorP( aAnchorP ),
m_anchorN( aAnchorN ), m_isDiagonal( aIsDiagonal ),
m_allowedEntryAngles( aAllowedEntryAngles ), m_priority( aPriority )
{
m_hasEntryLines = false;
}
~DP_GATEWAY()
{
}
/**
* @return true if the gateway anchors lie on a diagonal line.
*/
bool IsDiagonal() const
{
return m_isDiagonal;
}
const VECTOR2I& AnchorP() const { return m_anchorP; }
const VECTOR2I& AnchorN() const { return m_anchorN; }
/**
* @return a mask of 45-degree entry directions allowed for the gateway.
*/
int AllowedAngles () const { return m_allowedEntryAngles; }
/**
* @return priority/score value for gateway matching.
*/
int Priority() const
{
return m_priority;
}
void SetPriority(int aPriority)
{
m_priority = aPriority;
}
void SetEntryLines( const SHAPE_LINE_CHAIN& aEntryP, const SHAPE_LINE_CHAIN& aEntryN )
{
m_entryP = aEntryP;
m_entryN = aEntryN;
m_hasEntryLines = true;
}
const SHAPE_LINE_CHAIN& EntryP() const { return m_entryP; }
const SHAPE_LINE_CHAIN& EntryN() const { return m_entryN; }
const DIFF_PAIR Entry() const ;
void Reverse();
bool HasEntryLines () const
{
return m_hasEntryLines;
}
private:
SHAPE_LINE_CHAIN m_entryP, m_entryN;
bool m_hasEntryLines;
VECTOR2I m_anchorP, m_anchorN;
bool m_isDiagonal;
int m_allowedEntryAngles;
int m_priority;
};
/**
* Store starting/ending primitives (pads, vias or segments) for a differential pair.
*/
class DP_PRIMITIVE_PAIR
{
public:
DP_PRIMITIVE_PAIR():
m_primP( nullptr ), m_primN( nullptr ) {};
DP_PRIMITIVE_PAIR( const DP_PRIMITIVE_PAIR& aOther );
DP_PRIMITIVE_PAIR( ITEM* aPrimP, ITEM* aPrimN );
DP_PRIMITIVE_PAIR( const VECTOR2I& aAnchorP, const VECTOR2I& aAnchorN );
~DP_PRIMITIVE_PAIR();
void SetAnchors( const VECTOR2I& aAnchorP, const VECTOR2I& aAnchorN );
const VECTOR2I& AnchorP() const { return m_anchorP; }
const VECTOR2I& AnchorN() const { return m_anchorN; }
DP_PRIMITIVE_PAIR& operator=( const DP_PRIMITIVE_PAIR& aOther );
ITEM* PrimP() const { return m_primP; }
ITEM* PrimN() const { return m_primN; }
bool Directional() const;
DIRECTION_45 DirP() const;
DIRECTION_45 DirN() const;
void CursorOrientation( const VECTOR2I& aCursorPos, VECTOR2I& aMidpoint,
VECTOR2I& aDirection ) const;
void dump()
{
printf( "-- Prim-P %p anchor [%d, %d]\n", m_primP, m_anchorP.x, m_anchorP.y );
printf( "-- Prim-N %p anchor [%d, %d]\n", m_primN, m_anchorN.x, m_anchorN.y );
}
private:
DIRECTION_45 anchorDirection( const ITEM* aItem, const VECTOR2I& aP ) const;
ITEM* m_primP;
ITEM* m_primN;
VECTOR2I m_anchorP, m_anchorN;
};
/**
* A set of gateways calculated for the cursor or starting/ending primitive pair.
*/
class DP_GATEWAYS
{
public:
DP_GATEWAYS( int aGap ):
m_gap( aGap ),
m_viaGap( aGap )
{
// Do not leave uninitialized members, and keep static analyzer quiet:
m_viaDiameter = 0;
m_fitVias = true;
}
void Clear() { m_gateways.clear(); }
void SetFitVias( bool aEnable, int aDiameter = 0, int aViaGap = -1 )
{
m_fitVias = aEnable;
m_viaDiameter = aDiameter;
if( aViaGap < 0 )
m_viaGap = m_gap;
else
m_viaGap = aViaGap;
}
void BuildForCursor( const VECTOR2I& aCursorPos );
void BuildOrthoProjections( DP_GATEWAYS& aEntries, const VECTOR2I& aCursorPos,
int aOrthoScore );
void BuildGeneric( const VECTOR2I& p0_p, const VECTOR2I& p0_n, bool aBuildEntries = false,
bool aViaMode = false );
void BuildFromPrimitivePair( const DP_PRIMITIVE_PAIR& aPair, bool aPreferDiagonal );
bool FitGateways( DP_GATEWAYS& aEntry, DP_GATEWAYS& aTarget, bool aPrefDiagonal,
DIFF_PAIR& aDp );
std::vector<DP_GATEWAY>& Gateways() { return m_gateways; }
const std::vector<DP_GATEWAY>& CGateways() const { return m_gateways; }
void FilterByOrientation( int aAngleMask, DIRECTION_45 aRefOrientation );
private:
struct DP_CANDIDATE
{
SHAPE_LINE_CHAIN p, n;
VECTOR2I gw_p, gw_n;
int score;
};
bool checkDiagonalAlignment( const VECTOR2I& a, const VECTOR2I& b ) const;
void buildDpContinuation( const DP_PRIMITIVE_PAIR& aPair, bool aIsDiagonal );
void buildEntries( const VECTOR2I& p0_p, const VECTOR2I& p0_n );
int m_gap;
int m_viaGap;
int m_viaDiameter;
bool m_fitVias;
std::vector<DP_GATEWAY> m_gateways;
};
/**
* Basic class for a differential pair. Stores two PNS_LINEs (for positive and negative nets,
* respectively), the gap and coupling constraints.
*/
class DIFF_PAIR : public LINK_HOLDER
{
public:
struct COUPLED_SEGMENTS
{
COUPLED_SEGMENTS ( const SEG& aCoupledP, const SEG& aParentP, int aIndexP,
const SEG& aCoupledN, const SEG& aParentN, int aIndexN ) :
coupledP( aCoupledP ),
coupledN( aCoupledN ),
parentP( aParentP ),
parentN( aParentN ),
indexP( aIndexP ),
indexN( aIndexN )
{}
SEG coupledP;
SEG coupledN;
SEG parentP;
SEG parentN;
int indexP;
int indexN;
};
typedef std::vector<COUPLED_SEGMENTS> COUPLED_SEGMENTS_VEC;
DIFF_PAIR() :
LINK_HOLDER( ITEM::DIFF_PAIR_T ),
m_hasVias( false )
{
// Initialize some members, to avoid uninitialized variables.
m_net_p = 0;
m_net_n = 0;;
m_width = 0;
m_gap = 0;
m_viaGap = 0;
m_maxUncoupledLength = 0;
m_chamferLimit = 0;
}
DIFF_PAIR( int aGap ) :
LINK_HOLDER( ITEM::DIFF_PAIR_T ),
m_hasVias( false )
{
m_gapConstraint = aGap;
// Initialize other members, to avoid uninitialized variables.
m_net_p = 0;
m_net_n = 0;;
m_width = 0;
m_gap = 0;
m_viaGap = 0;
m_maxUncoupledLength = 0;
m_chamferLimit = 0;
}
DIFF_PAIR( const SHAPE_LINE_CHAIN &aP, const SHAPE_LINE_CHAIN& aN, int aGap = 0 ) :
LINK_HOLDER( ITEM::DIFF_PAIR_T ),
m_n( aN ),
m_p( aP ),
m_hasVias( false )
{
m_gapConstraint = aGap;
// Initialize other members, to avoid uninitialized variables.
m_net_p = 0;
m_net_n = 0;;
m_width = 0;
m_gap = 0;
m_viaGap = 0;
m_maxUncoupledLength = 0;
m_chamferLimit = 0;
}
DIFF_PAIR( const LINE &aLineP, const LINE &aLineN, int aGap = 0 ) :
LINK_HOLDER( ITEM::DIFF_PAIR_T ),
m_line_p( aLineP ),
m_line_n( aLineN ),
m_hasVias( false )
{
m_gapConstraint = aGap;
m_net_p = aLineP.Net();
m_net_n = aLineN.Net();
m_p = aLineP.CLine();
m_n = aLineN.CLine();
// Do not leave uninitialized members, and keep static analyzer quiet:
m_width = 0;
m_gap = 0;
m_viaGap = 0;
m_maxUncoupledLength = 0;
m_chamferLimit = 0;
}
static inline bool ClassOf( const ITEM* aItem )
{
return aItem && ITEM::DIFF_PAIR_T == aItem->Kind();
}
DIFF_PAIR* Clone() const override
{
assert( false );
return nullptr;
}
virtual void ClearLinks() override
{
m_links.clear();
m_line_p.ClearLinks();
m_line_n.ClearLinks();
}
static DIFF_PAIR* AssembleDp( LINE *aLine );
void SetShape( const SHAPE_LINE_CHAIN &aP, const SHAPE_LINE_CHAIN& aN, bool aSwapLanes = false )
{
if( aSwapLanes )
{
m_p = aN;
m_n = aP;
}
else
{
m_p = aP;
m_n = aN;
}
}
void SetShape( const DIFF_PAIR& aPair )
{
m_p = aPair.m_p;
m_n = aPair.m_n;
}
void SetNets( int aP, int aN )
{
m_net_p = aP;
m_net_n = aN;
}
void SetWidth( int aWidth )
{
m_width = aWidth;
m_n.SetWidth( aWidth );
m_p.SetWidth( aWidth );
}
int Width() const { return m_width; }
void SetGap( int aGap )
{
m_gap = aGap;
m_gapConstraint = RANGED_NUM<int>( m_gap, 10000, 10000 );
}
int Gap() const
{
return m_gap;
}
void AppendVias( const VIA &aViaP, const VIA& aViaN )
{
m_hasVias = true;
m_via_p = aViaP;
m_via_n = aViaN;
}
void RemoveVias()
{
m_hasVias = false;
}
bool EndsWithVias() const
{
return m_hasVias;
}
void SetViaDiameter( int aDiameter )
{
m_via_p.SetDiameter( aDiameter );
m_via_n.SetDiameter( aDiameter );
}
void SetViaDrill( int aDrill )
{
m_via_p.SetDrill( aDrill );
m_via_n.SetDrill( aDrill );
}
int NetP() const
{
return m_net_p;
}
int NetN() const
{
return m_net_n;
}
LINE& PLine()
{
if( !m_line_p.IsLinked() )
updateLine( m_line_p, m_p, m_net_p, m_via_p );
return m_line_p;
}
LINE& NLine()
{
if( !m_line_n.IsLinked() )
updateLine( m_line_n, m_n, m_net_n, m_via_n );
return m_line_n;
}
DP_PRIMITIVE_PAIR EndingPrimitives();
double CoupledLength() const;
double TotalLength() const;
double CoupledLengthFactor() const;
double Skew() const;
void CoupledSegmentPairs( COUPLED_SEGMENTS_VEC& aPairs ) const;
void Clear()
{
m_n.Clear();
m_p.Clear();
}
void Append( const DIFF_PAIR& aOther )
{
m_n.Append( aOther.m_n );
m_p.Append( aOther.m_p );
}
bool Empty() const
{
return ( m_n.SegmentCount() == 0 ) || ( m_p.SegmentCount() == 0 );
}
const SHAPE_LINE_CHAIN& CP() const { return m_p; }
const SHAPE_LINE_CHAIN& CN() const { return m_n; }
bool BuildInitial( const DP_GATEWAY& aEntry, const DP_GATEWAY& aTarget, bool aPrefDiagonal );
bool CheckConnectionAngle( const DIFF_PAIR &aOther, int allowedAngles ) const;
int CoupledLength( const SEG& aP, const SEG& aN ) const;
int64_t CoupledLength( const SHAPE_LINE_CHAIN& aP, const SHAPE_LINE_CHAIN& aN ) const;
const RANGED_NUM<int> GapConstraint() const
{
return m_gapConstraint;
}
private:
void updateLine( LINE &aLine, const SHAPE_LINE_CHAIN& aShape, int aNet, const VIA& aVia )
{
aLine.SetShape( aShape );
aLine.SetWidth( m_width );
aLine.SetNet( aNet );
aLine.SetLayer( Layers().Start() );
if( m_hasVias )
aLine.AppendVia( aVia );
}
SHAPE_LINE_CHAIN m_n, m_p;
LINE m_line_p, m_line_n;
VIA m_via_p, m_via_n;
bool m_hasVias;
int m_net_p, m_net_n;
int m_width;
int m_gap;
int m_viaGap;
int m_maxUncoupledLength;
int m_chamferLimit;
RANGED_NUM<int> m_gapConstraint;
};
}
#endif
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