sg_helpers.h

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2015-2017 Cirilo Bernardo <[email protected]>
 * Copyright (C) 2020 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * 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 2
 * 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, you may find one here:
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * or you may search the http://www.gnu.org website for the version 2 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
 */
 
#ifndef SG_HELPERS_H
#define SG_HELPERS_H
 
#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
#include "plugins/3dapi/sg_base.h"
#include "plugins/3dapi/sg_types.h"
#include <glm/glm.hpp>
 
class SGNORMALS;
class SGCOORDS;
class SGCOORDINDEX;
 
 
// Function to drop references within an SGNODE
// The node being destroyed must remove itself from the object reference's
// backpointer list in order to avoid a segfault.
#define DROP_REFS( aType, aList ) \
 do \
 { \
 std::vector<aType*>::iterator sL = aList.begin(); \
 std::vector<aType*>::iterator eL = aList.end(); \
 while( sL != eL ) \
 { \
 ( (SGNODE*) *sL )->delNodeRef( this ); \
 ++sL; \
 } \
 aList.clear(); \
 } while( 0 )
 
 
// Function to delete owned objects within an SGNODE
// The owned object's parent is set to NULL before
// deletion to avoid a redundant 'unlinkChildNode' call.
#define DEL_OBJS( aType, aList ) \
 do \
 { \
 std::vector<aType*>::iterator sL = aList.begin(); \
 std::vector<aType*>::iterator eL = aList.end(); \
 while( sL != eL ) \
 { \
 ( (SGNODE*) *sL )->SetParent( nullptr, false ); \
 delete *sL; \
 ++sL; \
 } \
 aList.clear(); \
 } while( 0 )
 
 
// Function to unlink a child or reference node when that child or
// reference node is being destroyed.
#define UNLINK_NODE( aNodeID, aType, aNode, aOwnedList, aRefList, isChild ) \
 do \
 { \
 if( aNodeID == aNode->GetNodeType() ) \
 { \
 std::vector<aType*>* oSL; \
 std::vector<aType*>::iterator sL; \
 std::vector<aType*>::iterator eL; \
 if( isChild ) \
 { \
 oSL = &aOwnedList; \
 sL = oSL->begin(); \
 eL = oSL->end(); \
 while( sL != eL ) \
 { \
 if( (SGNODE*) *sL == aNode ) \
 { \
 oSL->erase( sL ); \
 return; \
 } \
 ++sL; \
 } \
 } \
 else \
 { \
 oSL = &aRefList; \
 sL = oSL->begin(); \
 eL = oSL->end(); \
 while( sL != eL ) \
 { \
 if( (SGNODE*) *sL == aNode ) \
 { \
 delNodeRef( this ); \
 oSL->erase( sL ); \
 return; \
 } \
  ++sL; \
 } \
 } \
 return; \
 } \
 } while( 0 )
 
 
// Function to check a node type, check for an existing reference,
// and add the node type to the reference list if applicable
#define ADD_NODE( aNodeID, aType, aNode, aOwnedList, aRefList, isChild ) \
 do \
 { \
 if( aNodeID == aNode->GetNodeType() ) \
 { \
 std::vector<aType*>::iterator sL; \
 sL = std::find( aOwnedList.begin(), aOwnedList.end(), aNode ); \
 if( sL != aOwnedList.end() ) \
 return true; \
 sL = std::find( aRefList.begin(), aRefList.end(), aNode ); \
 if( sL != aRefList.end() )  \
 return true; \
 if( isChild ) \
 { \
 SGNODE* ppn = (SGNODE*) aNode->GetParent(); \
 if( nullptr != ppn ) \
 { \
 if( this != ppn ) \
 { \
 std::cerr << __FILE__ << ": " << __FUNCTION__ << ": " << __LINE__ << "\n"; \
 std::cerr << " * [BUG] object '" << aNode->GetName(); \
 std::cerr << "' has multiple parents '" << ppn->GetName() << "', '"; \
 std::cerr << m_Name << "'\n"; \
 return false; \
 } \
 } \
 aOwnedList.push_back( (aType*) aNode ); \
 aNode->SetParent( this, false ); \
 } \
 else  \
 { \
 /*if( nullptr == aNode->GetParent() ) { \
 std::cerr << __FILE__ << ": " << __FUNCTION__ << ": " << __LINE__ << "\n"; \
 std::cerr << " * [BUG] object '" << aNode->GetName(); \
 std::cerr << "' has no parent\n"; \
 std::cerr << " * [INFO] possible copy assignment or copy constructor bug\n"; \
 return false; \
 } */ \
 aRefList.push_back( (aType*) aNode ); \
 aNode->addNodeRef( this ); \
 } \
 return true; \
 } \
 } while( 0 )
 
 
// Function to find a node object given a (non-unique) node name
#define FIND_NODE( aType, aName, aNodeList, aCallingNode ) \
 do \
 { \
 std::vector<aType*>::iterator sLA = aNodeList.begin(); \
 std::vector<aType*>::iterator eLA = aNodeList.end(); \
 SGNODE* psg = nullptr; \
 while( sLA != eLA ) \
 { \
 if( (SGNODE*) *sLA != aCallingNode ) \
 { \
 psg = (SGNODE*) ( *sLA )->FindNode( aName, this ); \
 if( nullptr != psg ) \
 return psg; \
 } \
 ++sLA; \
 } \
 } while( 0 )
 
 
namespace S3D
{
 bool degenerate( glm::dvec3* pts ) noexcept;
 
 //
 // Normals calculations from triangles
 //
 
 /*
 * Take an array of 3D coordinates and its corresponding index set and calculates
 * the normals assuming that indices are given in CCW order.
 *
 * Care must be taken in using this function to ensure that:
 * -# All coordinates are indexed; unindexed coordinates are assigned normal(0,0,1);
 * when dealing with VRML models which may list and reuse one large coordinate set it
 * is necessary to gather all index sets and perform this operation only once.
 * -# Index sets must represent triangles (multiple of 3 indices) and must not be
 * degenerate, that is all indices and coordinates in a triad must be unique.
 *
 * @param coords is the array of 3D vertices.
 * @param index is the array of 3x vertex indices (triads).
 * @param norms is an empty array which holds the normals corresponding to each vector.
 * @return true on success; otherwise false.
 */
 bool CalcTriangleNormals( std::vector< SGPOINT > coords, std::vector< int >& index,
 std::vector< SGVECTOR >& norms );
 
 // formats a floating point number for text output to a VRML file
 void FormatFloat( std::string& result, double value );
 
 // format orientation data for VRML output
 void FormatOrientation( std::string& result, const SGVECTOR& axis, double rotation );
 
 // format point data for VRML output
 void FormatPoint( std::string& result, const SGPOINT& point );
 
 // format vector data for VRML output
 void FormatVector( std::string& result, const SGVECTOR& aVector );
 
 // format Color data for VRML output
 void FormatColor( std::string& result, const SGCOLOR& aColor );
 
 //
 // Cache related WRITE functions
 //
 
 // write out an XYZ vertex
 bool WritePoint( std::ostream& aFile, const SGPOINT& aPoint );
 
 // write out a unit vector
 bool WriteVector( std::ostream& aFile, const SGVECTOR& aVector );
 
 // write out an RGB color
 bool WriteColor( std::ostream& aFile, const SGCOLOR& aColor );
 
 S3D::SGTYPES ReadTag( std::istream& aFile, std::string& aName );
 
 // read an XYZ vertex
 bool ReadPoint( std::istream& aFile, SGPOINT& aPoint );
 
 // read a unit vector
 bool ReadVector( std::istream& aFile, SGVECTOR& aVector );
 
 // read an RGB color
 bool ReadColor( std::istream& aFile, SGCOLOR& aColor );
}
 
#endif // SG_HELPERS_H