Modified source engine (2017) developed by valve and leaked in 2020. Not for commercial purporses
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//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose:
//
//=====================================================================================//
#ifndef MESHREADER_H
#define MESHREADER_H
#ifdef _WIN32
#pragma once
#endif
//-----------------------------------------------------------------------------
// This is used to read vertex and index data out of already-created meshes.
// xbox uses this a lot so it doesn't have to store sysmem backups of the
// vertex data.
//-----------------------------------------------------------------------------
class CBaseMeshReader : protected MeshDesc_t
{
// Initialization.
public:
CBaseMeshReader();
~CBaseMeshReader();
// Use BeginRead/EndRead to initialize the mesh reader.
void BeginRead(
IMesh* pMesh,
int firstVertex = 0,
int numVertices = 0,
int firstIndex = 0,
int numIndices = 0 );
void EndRead();
// PC can use this if it stores its own copy of meshes around, in case
// locking static buffers is too costly.
void BeginRead_Direct( const MeshDesc_t &desc, int numVertices, int nIndices );
// Resets the mesh builder so it points to the start of everything again
void Reset();
protected:
IMesh *m_pMesh;
int m_MaxVertices;
int m_MaxIndices;
};
// A bunch of accessors for the data that CBaseMeshReader sets up.
class CMeshReader : public CBaseMeshReader
{
public:
// Access to vertex data.
public:
int NumIndices() const;
unsigned short Index( int index ) const;
const Vector& Position( int iVertex ) const;
unsigned int Color( int iVertex ) const;
const float *TexCoord( int iVertex, int stage ) const;
void TexCoord2f( int iVertex, int stage, float &s, float &t ) const;
const Vector2D& TexCoordVector2D( int iVertex, int stage ) const;
int NumBoneWeights() const;
float Wrinkle( int iVertex ) const;
const Vector &Normal( int iVertex ) const;
void Normal( int iVertex, Vector &vNormal ) const;
const Vector &TangentS( int iVertex ) const;
const Vector &TangentT( int iVertex ) const;
float BoneWeight( int iVertex ) const;
#ifdef NEW_SKINNING
float* BoneMatrix( int iVertex ) const;
#else
unsigned char* BoneMatrix( int iVertex ) const;
#endif
};
//-----------------------------------------------------------------------------
// CBaseMeshReader implementation.
//-----------------------------------------------------------------------------
inline CBaseMeshReader::CBaseMeshReader()
{
m_pMesh = NULL;
}
inline CBaseMeshReader::~CBaseMeshReader()
{
Assert( !m_pMesh );
}
inline void CBaseMeshReader::BeginRead(
IMesh* pMesh,
int firstVertex,
int numVertices,
int firstIndex,
int numIndices )
{
Assert( pMesh && (!m_pMesh) );
if ( numVertices < 0 )
{
numVertices = pMesh->VertexCount();
}
if ( numIndices < 0 )
{
numIndices = pMesh->IndexCount();
}
m_pMesh = pMesh;
m_MaxVertices = numVertices;
m_MaxIndices = numIndices;
// UNDONE: support reading from compressed VBs if needed
VertexCompressionType_t compressionType = CompressionType( pMesh->GetVertexFormat() );
Assert( compressionType == VERTEX_COMPRESSION_NONE );
if ( compressionType != VERTEX_COMPRESSION_NONE )
{
Warning( "Cannot use CBaseMeshReader with compressed vertices! Will get junk data or a crash.\n" );
}
// Locks mesh for modifying
pMesh->ModifyBeginEx( true, firstVertex, numVertices, firstIndex, numIndices, *this );
// Point to the start of the buffers..
Reset();
}
inline void CBaseMeshReader::EndRead()
{
Assert( m_pMesh );
m_pMesh->ModifyEnd( *this );
m_pMesh = NULL;
}
inline void CBaseMeshReader::BeginRead_Direct( const MeshDesc_t &desc, int nVertices, int nIndices )
{
MeshDesc_t *pThis = this;
*pThis = desc;
m_MaxVertices = nVertices;
m_MaxIndices = nIndices;
// UNDONE: support reading from compressed verts if necessary
Assert( desc.m_CompressionType == VERTEX_COMPRESSION_NONE );
if ( desc.m_CompressionType != VERTEX_COMPRESSION_NONE )
{
Warning( "Cannot use CBaseMeshReader with compressed vertices!\n" );
}
}
inline void CBaseMeshReader::Reset()
{
}
// -------------------------------------------------------------------------------------- //
// CMeshReader implementation.
// -------------------------------------------------------------------------------------- //
inline int CMeshReader::NumIndices() const
{
return m_MaxIndices;
}
inline unsigned short CMeshReader::Index( int index ) const
{
Assert( (index >= 0) && (index < m_MaxIndices) );
return m_pIndices[index * m_nIndexSize];
}
inline const Vector& CMeshReader::Position( int iVertex ) const
{
Assert( iVertex >= 0 && iVertex < m_MaxVertices );
return *(Vector*)((char*)m_pPosition + iVertex * m_VertexSize_Position);
}
inline unsigned int CMeshReader::Color( int iVertex ) const
{
Assert( iVertex >= 0 && iVertex < m_MaxVertices );
unsigned char *pColor = m_pColor + iVertex * m_VertexSize_Color;
return (pColor[0] << 16) | (pColor[1] << 8) | (pColor[2]) | (pColor[3] << 24);
}
inline const float *CMeshReader::TexCoord( int iVertex, int iStage ) const
{
Assert( iVertex >= 0 && iVertex < m_MaxVertices );
return (float*)( (char*)m_pTexCoord[iStage] + iVertex * m_VertexSize_TexCoord[iStage] );
}
inline void CMeshReader::TexCoord2f( int iVertex, int iStage, float &s, float &t ) const
{
Assert( iVertex >= 0 && iVertex < m_MaxVertices );
float *p = (float*)( (char*)m_pTexCoord[iStage] + iVertex * m_VertexSize_TexCoord[iStage] );
s = p[0];
t = p[1];
}
inline const Vector2D& CMeshReader::TexCoordVector2D( int iVertex, int iStage ) const
{
Assert( iVertex >= 0 && iVertex < m_MaxVertices );
Vector2D *p = (Vector2D*)( (char*)m_pTexCoord[iStage] + iVertex * m_VertexSize_TexCoord[iStage] );
return *p;
}
inline float CMeshReader::Wrinkle( int iVertex ) const
{
Assert( iVertex >= 0 && iVertex < m_MaxVertices );
return *(float*)( (char*)m_pWrinkle + iVertex * m_VertexSize_Wrinkle );
}
inline int CMeshReader::NumBoneWeights() const
{
return m_NumBoneWeights;
}
inline const Vector &CMeshReader::Normal( int iVertex ) const
{
Assert( iVertex >= 0 && iVertex < m_MaxVertices );
return *(const Vector *)(const float*)( (char*)m_pNormal + iVertex * m_VertexSize_Normal );
}
inline void CMeshReader::Normal( int iVertex, Vector &vNormal ) const
{
Assert( iVertex >= 0 && iVertex < m_MaxVertices );
const float *p = (const float*)( (char*)m_pNormal + iVertex * m_VertexSize_Normal );
vNormal.Init( p[0], p[1], p[2] );
}
inline const Vector &CMeshReader::TangentS( int iVertex ) const
{
Assert( iVertex >= 0 && iVertex < m_MaxVertices );
return *(const Vector*)( (char*)m_pTangentS + iVertex * m_VertexSize_TangentS );
}
inline const Vector &CMeshReader::TangentT( int iVertex ) const
{
Assert( iVertex >= 0 && iVertex < m_MaxVertices );
return *(const Vector*)( (char*)m_pTangentT + iVertex * m_VertexSize_TangentT );
}
inline float CMeshReader::BoneWeight( int iVertex ) const
{
Assert( iVertex >= 0 && iVertex < m_MaxVertices );
float *p = (float*)( (char*)m_pBoneWeight + iVertex * m_VertexSize_BoneWeight );
return *p;
}
#endif // MESHREADER_H