481 lines
13 KiB
C++
481 lines
13 KiB
C++
//========= Copyright Valve Corporation, All rights reserved. ============//
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//
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// Implementation of CDmMeshComp - CDmeMesh computation class
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//
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//=============================================================================
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// Valve includes
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#include "movieobjects/dmmeshcomp.h"
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#include "movieobjects/dmefaceset.h"
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#include "movieobjects/dmemesh.h"
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#include "movieobjects/dmevertexdata.h"
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// memdbgon must be the last include file in a .cpp file!!!
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#include "tier0/memdbgon.h"
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//=============================================================================
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//
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//=============================================================================
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CDmMeshComp::CDmMeshComp( CDmeMesh *pMesh, CDmeVertexData *pPassedBase )
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: m_pMesh( pMesh )
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, m_pBase( NULL )
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{
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m_pBase = pPassedBase ? pPassedBase : pMesh->GetCurrentBaseState();
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if ( !m_pBase )
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return;
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const FieldIndex_t pIndex( m_pBase->FindFieldIndex( CDmeVertexData::FIELD_POSITION ) );
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if ( pIndex < 0 )
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return;
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const CUtlVector< Vector > &pPositionData( m_pBase->GetPositionData() );
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const CUtlVector<int> &pPositionIndices( m_pBase->GetVertexIndexData( CDmeVertexData::FIELD_POSITION ) );
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const int nVertices( pPositionData.Count() );
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if ( nVertices <= 0 )
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return;
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// Create vertices
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// TODO: check for duplicates in pPositionData - that would break this algorithm
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m_verts.EnsureCapacity( nVertices );
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for ( int i = 0; i < nVertices; ++i )
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{
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const CUtlVector< int > &vertexIndices = m_pBase->FindVertexIndicesFromDataIndex( CDmeVertexData::FIELD_POSITION, i );
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m_verts.AddToTail( new CVert( i, &vertexIndices, &pPositionData[ i ] ) );
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}
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// Create edges and faces
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const int nFaceSets( pMesh->FaceSetCount() );
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for ( int i = 0; i < nFaceSets; ++i )
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{
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CDmeFaceSet *pFaceSet( pMesh->GetFaceSet( i ) );
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const int nIndices( pFaceSet->NumIndices() );
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if ( nIndices < 4 ) // At least a triangle and a -1
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continue;
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m_faces.EnsureCapacity( m_faces.Count() + nIndices / 4 ); // # new faces <= nIndices/4 (tri + -1)
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m_edges.EnsureCapacity( m_edges.Count() + nIndices / 2 ); // # new edges <= 2*new faces
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int facePosIndex( -1 );
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int edgePosIndex0( -1 );
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int edgePosIndex1( -1 );
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CUtlVector< CVert * > verts;
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CUtlVector< CEdge * > edges;
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CUtlVector< bool > edgeReverseMap;
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bool bReverse = false;
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for ( int j( 0 ); j < nIndices; ++j )
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{
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const int faceVertexIndex( pFaceSet->GetIndex( j ) );
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if ( faceVertexIndex < 0 )
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{
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// End of face
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edgePosIndex0 = edgePosIndex1;
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edgePosIndex1 = facePosIndex;
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Assert( edgePosIndex0 >= 0 );
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Assert( edgePosIndex1 >= 0 );
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edges.AddToTail( FindOrCreateEdge( edgePosIndex0, edgePosIndex1, &bReverse ) );
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edgeReverseMap.AddToTail( bReverse );
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CreateFace( verts, edges, edgeReverseMap );
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facePosIndex = -1;
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verts.RemoveAll();
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edges.RemoveAll();
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edgeReverseMap.RemoveAll();
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continue;
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}
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if ( facePosIndex < 0 )
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{
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// First vertex
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facePosIndex = pPositionIndices[ faceVertexIndex ];
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edgePosIndex1 = facePosIndex;
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verts.AddToTail( m_verts[ edgePosIndex1 ] );
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continue;
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}
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// 2nd through last vertex
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edgePosIndex0 = edgePosIndex1;
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edgePosIndex1 = pPositionIndices[ faceVertexIndex ];
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verts.AddToTail( m_verts[ edgePosIndex1 ] );
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Assert( edgePosIndex0 >= 0 );
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Assert( edgePosIndex1 >= 0 );
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edges.AddToTail( FindOrCreateEdge( edgePosIndex0, edgePosIndex1, &bReverse ) );
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edgeReverseMap.AddToTail( bReverse );
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}
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}
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}
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//-----------------------------------------------------------------------------
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//
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//-----------------------------------------------------------------------------
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CDmMeshComp::~CDmMeshComp()
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{
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m_verts.PurgeAndDeleteElements();
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m_edges.PurgeAndDeleteElements();
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}
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//-----------------------------------------------------------------------------
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//
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//-----------------------------------------------------------------------------
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CDmMeshComp::CVert::CVert( int nPositionIndex, const CUtlVector< int > *pVertexIndices, const Vector *pPosition )
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: m_positionIndex( nPositionIndex )
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, m_pVertexIndices( pVertexIndices )
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, m_pPosition( pPosition )
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, m_edges( 8, 8 )
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{
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}
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//-----------------------------------------------------------------------------
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//
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//-----------------------------------------------------------------------------
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CDmMeshComp::CVert::CVert( const CVert &src )
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: m_positionIndex( src.m_positionIndex )
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, m_pVertexIndices( src.m_pVertexIndices )
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, m_pPosition( src.m_pPosition )
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, m_edges( 8, 8 )
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{
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m_edges.AddMultipleToTail( src.m_edges.Count(), src.m_edges.Base() );
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}
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//-----------------------------------------------------------------------------
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//
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//-----------------------------------------------------------------------------
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int CDmMeshComp::CVert::PositionIndex() const
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{
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return m_positionIndex;
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}
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//-----------------------------------------------------------------------------
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//
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//-----------------------------------------------------------------------------
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const Vector *CDmMeshComp::CVert::Position() const
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{
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return m_pPosition;
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}
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//-----------------------------------------------------------------------------
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//
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//-----------------------------------------------------------------------------
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const CUtlVector< int > *CDmMeshComp::CVert::VertexIndices() const
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{
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return m_pVertexIndices;
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}
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//-----------------------------------------------------------------------------
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//
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//-----------------------------------------------------------------------------
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bool CDmMeshComp::CVert::operator==( const CVert &rhs ) const
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{
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return ( m_pPosition->DistToSqr( *rhs.m_pPosition ) < FLT_EPSILON );
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}
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//-----------------------------------------------------------------------------
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//
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//-----------------------------------------------------------------------------
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CDmMeshComp::CEdge::CEdge()
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: m_pVert0( NULL )
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, m_pVert1( NULL )
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, m_faceCount( 0 )
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{
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}
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//-----------------------------------------------------------------------------
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// Returns the vertex position index given the edge relative vertex index
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//-----------------------------------------------------------------------------
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int CDmMeshComp::CEdge::GetVertPositionIndex( int edgeRelativeVertexIndex ) const
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{
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if ( edgeRelativeVertexIndex == 0 && m_pVert0 )
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return m_pVert0->PositionIndex();
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if ( edgeRelativeVertexIndex == 1 && m_pVert1 )
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return m_pVert1->PositionIndex();
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return -1;
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}
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//-----------------------------------------------------------------------------
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//
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//-----------------------------------------------------------------------------
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CDmMeshComp::CVert *CDmMeshComp::CEdge::GetVert( int edgeRelativeVertexIndex ) const
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{
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if ( edgeRelativeVertexIndex == 0 )
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return m_pVert0;
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if ( edgeRelativeVertexIndex == 1 )
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return m_pVert1;
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return NULL;
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}
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//-----------------------------------------------------------------------------
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// Returns true if the edge starts and stops at the same position in space
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// The order of the vertices is not checked
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//-----------------------------------------------------------------------------
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bool CDmMeshComp::CEdge::operator==( const CEdge &rhs ) const
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{
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return (
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( *m_pVert0 == *rhs.m_pVert0 && *m_pVert1 == *rhs.m_pVert1 ) ||
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( *m_pVert0 == *rhs.m_pVert1 && *m_pVert1 == *rhs.m_pVert0 ) );
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}
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//-----------------------------------------------------------------------------
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//
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//-----------------------------------------------------------------------------
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Vector CDmMeshComp::CEdge::EdgeVector() const
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{
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if ( m_pVert0 && m_pVert1 )
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return *m_pVert1->Position() - *m_pVert0->Position();
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return vec3_origin;
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}
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//-----------------------------------------------------------------------------
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// Finds or Creates an edge... Can still return NULL if vertices do not exist
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//-----------------------------------------------------------------------------
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CDmMeshComp::CEdge *CDmMeshComp::FindOrCreateEdge( int vIndex0, int vIndex1, bool *pReverse /* = NULL */ )
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{
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CEdge *pEdge = FindEdge( vIndex0, vIndex1, pReverse );
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if ( pEdge )
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return pEdge;
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CVert *pVert0 = m_verts[ vIndex0 ];
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if ( pVert0 == NULL )
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return NULL;
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CVert *pVert1 = m_verts[ vIndex1 ];
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if ( pVert1 == NULL )
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return NULL;
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pEdge = m_edges[ m_edges.AddToTail( new CEdge() ) ];
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pEdge->m_pVert0 = pVert0;
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pEdge->m_pVert1 = pVert1;
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pVert0->m_edges.AddToTail( pEdge );
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if ( vIndex0 != vIndex1 )
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pVert1->m_edges.AddToTail( pEdge );
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if ( pReverse )
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{
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*pReverse = false;
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}
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return pEdge;
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}
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//-----------------------------------------------------------------------------
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// Returns the edge between vIndex0 & vIndex1 (or vice versa), NULL if not found
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//-----------------------------------------------------------------------------
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CDmMeshComp::CEdge *CDmMeshComp::FindEdge( int vIndex0, int vIndex1, bool *pReverse /* = NULL */ )
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{
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CUtlVector< CEdge * > &edges = m_verts[ vIndex0 ]->m_edges;
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for ( int i = 0; i < edges.Count(); i++ )
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{
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CEdge *e = edges[ i ];
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if ( e->GetVertPositionIndex( 0 ) == vIndex0 && e->GetVertPositionIndex( 1 ) == vIndex1 )
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{
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if ( pReverse )
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{
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*pReverse = false;
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}
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return e;
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}
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if ( e->GetVertPositionIndex( 1 ) == vIndex0 && e->GetVertPositionIndex( 0 ) == vIndex1 )
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{
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if ( pReverse )
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{
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*pReverse = true;
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}
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return e;
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}
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}
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return NULL;
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}
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//-----------------------------------------------------------------------------
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//
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//-----------------------------------------------------------------------------
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CDmMeshComp::CFace *CDmMeshComp::CreateFace( const CUtlVector< CVert * > &verts, const CUtlVector< CEdge * > &edges, const CUtlVector< bool > &edgeReverseMap )
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{
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CFace *pFace = &m_faces[ m_faces.AddToTail() ];
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pFace->m_verts.RemoveAll();
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pFace->m_verts.AddVectorToTail( verts );
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pFace->m_edges.RemoveAll();
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pFace->m_edges.AddVectorToTail( edges );
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pFace->m_edgeReverseMap.RemoveAll();
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pFace->m_edgeReverseMap.AddVectorToTail( edgeReverseMap );
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for ( int nEdgeIndex = edges.Count() - 1; nEdgeIndex >= 0; --nEdgeIndex )
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{
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edges[ nEdgeIndex ]->m_faceCount += 1;
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}
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return pFace;
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}
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//-----------------------------------------------------------------------------
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//
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//-----------------------------------------------------------------------------
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int CDmMeshComp::FindFacesWithVert( int vIndex, CUtlVector< CFace * > &faces )
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{
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// TODO: optimize this by adding a vector of face pointers to each vertex
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faces.RemoveAll();
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for ( int fi( m_faces.Head() ); fi != m_faces.InvalidIndex(); fi = m_faces.Next( fi ) )
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{
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CFace &face( m_faces[ fi ] );
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for ( int i = 0; i < face.m_verts.Count(); ++i )
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{
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if ( face.m_verts[ i ]->PositionIndex() == vIndex )
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{
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faces.AddToTail( &face );
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break;
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}
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}
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}
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return faces.Count();
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}
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//-----------------------------------------------------------------------------
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//
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//-----------------------------------------------------------------------------
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int CDmMeshComp::FindNeighbouringVerts( int vIndex, CUtlVector< CVert * > &verts )
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{
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verts.RemoveAll();
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const CUtlVector< CEdge * > & edges = m_verts[ vIndex ]->m_edges;
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for ( int i = 0; i < edges.Count(); ++i )
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{
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CEdge *e = edges[ i ];
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if ( e->GetVertPositionIndex( 0 ) == vIndex )
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{
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verts.AddToTail( e->GetVert( 1 ) );
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}
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else
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{
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verts.AddToTail( e->GetVert( 0 ) );
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}
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}
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return verts.Count();
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}
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//-----------------------------------------------------------------------------
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// Find all edges that are only used by 1 face
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//-----------------------------------------------------------------------------
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int CDmMeshComp::GetBorderEdges( CUtlVector< CUtlVector< CEdge * > > &borderEdgesList )
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{
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// TODO: optimize this by stepping from edge to edge to build chains, using CVert::m_edges
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int retVal = 0;
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borderEdgesList.RemoveAll();
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bool connected;
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for ( int ei = 0; ei < m_edges.Count(); ei++ )
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{
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CEdge *pEdge = m_edges[ ei ];
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if ( pEdge->IsBorderEdge() )
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{
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++retVal;
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connected = false;
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for ( int i = borderEdgesList.Count() - 1; !connected && i >= 0; --i )
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{
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CUtlVector< CEdge * > &borderEdges = borderEdgesList[ i ];
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for ( int j = borderEdges.Count() - 1; j >= 0; --j )
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{
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if ( borderEdges[ j ]->ConnectedTo( pEdge ) )
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{
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borderEdges.AddToTail( pEdge );
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connected = true;
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break;
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}
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}
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}
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if ( !connected )
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{
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CUtlVector< CEdge * > &borderEdges = borderEdgesList[ borderEdgesList.AddToTail() ];
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borderEdges.AddToTail( pEdge );
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}
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}
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}
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// Shrink the borderEdgesList to minimum number required
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bool anyConnected = false;
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do
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{
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anyConnected = false;
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for ( int i = borderEdgesList.Count() - 1; i >= 0; --i )
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{
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CUtlVector< CEdge * > &srcBorderEdges = borderEdgesList[ i ];
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for ( int j = srcBorderEdges.Count() - 1; j >= 0; --j )
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{
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CEdge *pSrcEdge = srcBorderEdges[ j ];
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connected = false;
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for ( int k = 0; !connected && k < i; ++k )
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{
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CUtlVector< CEdge * > &dstBorderEdges = borderEdgesList[ k ];
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for ( int l = dstBorderEdges.Count() - 1; l >= 0; --l )
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{
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if ( dstBorderEdges[ l ]->ConnectedTo( pSrcEdge ) )
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{
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connected = true;
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anyConnected = true;
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dstBorderEdges.AddToTail( pSrcEdge );
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srcBorderEdges.Remove( j );
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break;
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}
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}
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}
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}
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if ( srcBorderEdges.Count() == 0 )
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{
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borderEdgesList.Remove( i );
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}
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}
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} while( anyConnected );
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return retVal;
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}
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