Added original SDK code for Alien Swarm.

public/disp_vertindex.h

@@ -0,0 +1,150 @@
+//========= Copyright <20> 1996-2005, Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#ifndef DISP_VERTINDEX_H
+#define DISP_VERTINDEX_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+
+#include "tier0/dbg.h"
+
+
+// ------------------------------------------------------------------------ //
+// Helper class used for indexing vertices in the 2D grid.
+// ------------------------------------------------------------------------ //
+
+class CVertIndex
+{
+public:
+				CVertIndex();
+				CVertIndex( short ix, short iy );
+	
+	void		Init( short ix, short iy );
+
+	short&		operator[]( short i );
+	short const&	operator[]( short i ) const;
+	void		operator+=( CVertIndex const &other );
+	void		operator-=( CVertIndex const &other );
+	CVertIndex	operator+( CVertIndex const &other ) const;
+	CVertIndex	operator-( CVertIndex const &other ) const;
+	void		operator<<=( int shift );
+	void		operator>>=( int shift );
+	bool		operator==( CVertIndex const &other ) const;
+	bool		operator!=( CVertIndex const &other ) const;
+
+
+public:
+
+	short			x, y;
+};
+
+
+// ------------------------------------------------------------------ //
+// Helper functions.
+// ------------------------------------------------------------------ //
+
+inline CVertIndex BuildOffsetVertIndex(
+	CVertIndex const &nodeIndex,
+	CVertIndex const &offset,
+	int mul )
+{
+	return CVertIndex( nodeIndex.x + offset.x * mul, nodeIndex.y + offset.y * mul );
+}
+
+
+// ------------------------------------------------------------------ //
+// CVertIndex inlines.
+// ------------------------------------------------------------------ //
+
+inline CVertIndex::CVertIndex()
+{
+}
+
+
+inline CVertIndex::CVertIndex( short ix, short iy )
+{
+	x = ix;
+	y = iy;
+}
+
+
+inline void CVertIndex::Init( short ix, short iy )
+{
+	x = ix;
+	y = iy;
+}
+
+
+inline short& CVertIndex::operator[]( short i )
+{
+	Assert( i >= 0 && i <= 1 );
+	return ((short*)this)[i];
+}
+
+
+inline short const& CVertIndex::operator[]( short i ) const
+{
+	Assert( i >= 0 && i <= 1 );
+	return ((short*)this)[i];
+}
+
+
+inline void CVertIndex::operator+=( CVertIndex const &other )
+{
+	x += other.x;
+	y += other.y;
+}
+
+
+inline void CVertIndex::operator-=( CVertIndex const &other )
+{
+	x -= other.x;
+	y -= other.y;
+}
+
+
+inline CVertIndex CVertIndex::operator+( CVertIndex const &other ) const
+{
+	return CVertIndex( x + other.x, y + other.y );
+}
+
+
+inline CVertIndex CVertIndex::operator-( CVertIndex const &other ) const
+{
+	return CVertIndex( x - other.x, y - other.y );
+}
+
+
+inline void CVertIndex::operator<<=( int shift )
+{
+	x <<= shift;
+	y <<= shift;
+}
+
+
+inline void CVertIndex::operator>>=( int shift )
+{
+	x >>= shift;
+	y >>= shift;
+}
+
+
+inline bool CVertIndex::operator==( CVertIndex const &other ) const
+{
+	return x==other.x && y==other.y;
+}
+
+
+inline bool CVertIndex::operator!=( CVertIndex const &other ) const
+{
+	return x!=other.x || y!=other.y;
+}
+
+
+#endif // DISP_VERTINDEX_H