VOID VertexData::AppendVertexDecl( LPDIRECT3DVERTEXDECLARATION9 pVertexDecl, DWORD dwStreamIndex )
{
if( m_pVertexDecl == NULL )
{
SetVertexDecl( pVertexDecl );
return;
}
DWORD dwExistingCount = MAXD3DDECLLENGTH + 1;
D3DVERTEXELEMENT9 ExistingElements[MAXD3DDECLLENGTH + 1];
m_pVertexDecl->GetDeclaration( ExistingElements, (UINT*)&dwExistingCount );
DWORD dwNewCount = MAXD3DDECLLENGTH + 1;
D3DVERTEXELEMENT9 NewElements[MAXD3DDECLLENGTH + 1];
pVertexDecl->GetDeclaration( NewElements, (UINT*)&dwNewCount );
AppendVertexElements( ExistingElements, dwStreamIndex, NewElements, 0, 0 );
D3DVertexDeclaration* pNewDecl = D3DDevice_CreateVertexDeclaration( ExistingElements );
SetVertexDecl( pNewDecl );
}
//--------------------------------------------------------------------------------------
// Name: CreatePooledVertexDeclaration()
// Desc: Function to coalesce vertex declarations into a shared pool of vertex declarations
//--------------------------------------------------------------------------------------
HRESULT WINAPI CreatePooledVertexDeclaration( const D3DVERTEXELEMENT9* pVertexElements,
D3DVertexDeclaration** ppVertexDeclaration )
{
static std::vector <VTX_DECL> m_VertexDecls;
// Count the number of vertex elements
DWORD dwNumElements = 0;
while( pVertexElements[dwNumElements].Stream < 16 )
dwNumElements++;
assert( dwNumElements <= MAXD3DDECLLENGTH );
// Check for a previously-created vertex decl
for( unsigned int i = 0; i < m_VertexDecls.size(); i++ )
{
if( ( m_VertexDecls[i].dwNumElements == dwNumElements ) &&
( !memcmp( m_VertexDecls[i].pElements, pVertexElements, sizeof( D3DVERTEXELEMENT9 ) * dwNumElements ) ) )
{
// If found, return it
( *ppVertexDeclaration ) = m_VertexDecls[i].pDeclaration;
return S_OK;
}
}
// No previously-created vertex decl was found, so create one
( *ppVertexDeclaration ) = D3DDevice_CreateVertexDeclaration( pVertexElements );
// And save a record of it
VTX_DECL d;
XMemCpy( d.pElements, pVertexElements, sizeof( D3DVERTEXELEMENT9 ) * dwNumElements );
d.dwNumElements = dwNumElements;
d.pDeclaration = ( *ppVertexDeclaration );
d.pDeclaration->AddRef();
m_VertexDecls.push_back( d );
return S_OK;
}
