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game/client/splinepatch.h

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: A little helper class that computes a spline patch
+//
+// $Workfile:     $
+// $Date:         $
+//
+//-----------------------------------------------------------------------------
+// $Log: $
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#ifndef SPLINEPATCH_H
+#define SPLINEPATCH_H
+#pragma once
+
+#include "mathlib/vector4d.h"
+
+//-----------------------------------------------------------------------------
+// Spline patch: 
+//-----------------------------------------------------------------------------
+
+class CSplinePatch
+{
+public:
+	// The last argument represents the number of float channels in addition to position
+	CSplinePatch( );
+	~CSplinePatch();
+
+	// Call this to initialize the patch
+	void Init( int w, int h, int extraChannels );
+
+	// 0 = linear, 1 = spliney!
+	void SetLinearBlend( float factor );
+
+	// Hooks the patch up to externally controlled data...
+	void SetControlPositions( Vector const** pPositions );
+	void SetChannelData( int channel, float* pChannel );
+
+	// This interface isn't wonderful; it's limited by optimization issues...
+
+	// Call this before querying the patch for data at (i,j)
+	void SetupPatchQuery( float i, float j );
+
+	// Gets the point and normal at (i,j) specified above
+	void GetPointAndNormal( Vector& position, Vector& normal ) const;
+
+	// Gets at other channels
+	float GetChannel( int channel ) const;
+
+	// Gets at the dimensions
+	int	Width() const { return m_Width; }
+	int Height() const { return m_Height; }
+
+public:
+	// The integer + float values for the patch query
+	int		m_is, m_it;
+	float	m_fs, m_ft;
+
+private:
+	enum
+	{
+		MAX_CHANNELS = 4
+	};
+
+	// no copy constructor
+	CSplinePatch( const CSplinePatch& );
+
+	// Computes indices of the samples to read for this interpolation
+	void ComputeIndices( );
+
+	// input data
+	int m_Width;
+	int m_Height;
+	int m_ChannelCount;
+	Vector const** m_ppPositions;
+	float const* m_pChannel[MAX_CHANNELS];
+
+	// temporary data used for a single patch query
+	int		m_SampleIndices[4][4];
+	Vector4D m_SVec;
+	Vector4D m_TVec;
+
+	float m_LinearFactor;
+};
+
+#endif // SPLINEPATCH_H