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app/legion/heightfield.h

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: Heightfield class
+//
+// $Revision: $
+// $NoKeywords: $
+//===========================================================================//
+
+#ifndef HEIGHTFIELD_H
+#define HEIGHTFIELD_H
+
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "materialsystem/MaterialSystemUtil.h"
+
+
+//-----------------------------------------------------------------------------
+// Forward declarations
+//-----------------------------------------------------------------------------
+class CMeshBuilder;
+
+
+//-----------------------------------------------------------------------------
+// Definition of a heightfield
+//-----------------------------------------------------------------------------
+class CHeightField
+{
+public:
+	CHeightField( int nPowX, int nPowY, int nPowScale );
+	~CHeightField();
+
+	// Loads the heights from a file
+	bool LoadHeightFromFile( const char *pFileName );
+
+	// Returns the max range of x, y
+	int GetWidth();
+	int GetHeight();
+
+	// Returns the height of the field at a paticular (x,y)
+	float GetHeight( float x, float y );
+	float GetHeightAndSlope( float x, float y, float *dx, float *dy );
+
+	// Draws the heightfield
+	void Draw( );
+
+private:
+	int m_nPowX;
+	int m_nPowY;
+	int m_nWidth;
+	int m_nHeight;
+	int m_nScale;
+	int m_nPowScale;
+	float m_flOOScale;
+	float *m_pHeightField;
+
+	CMaterialReference m_Material;
+	CTextureReference m_Texture;
+};
+
+
+//-----------------------------------------------------------------------------
+// Returns the max range of x, y (for use in GetHeight)
+//-----------------------------------------------------------------------------
+inline int CHeightField::GetWidth()
+{
+	return m_nWidth << m_nPowScale;
+}
+
+inline int CHeightField::GetHeight()
+{
+	return m_nHeight << m_nPowScale;
+}
+
+
+#endif // HEIGHTFIELD_H