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89 lines
2.2 KiB
C++
89 lines
2.2 KiB
C++
//========= Copyright © 1996-2005, Valve Corporation, All rights reserved. ============//
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//
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// Purpose: A little helper class that computes a spline patch
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//
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// $Workfile: $
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// $Date: $
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//
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//-----------------------------------------------------------------------------
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// $Log: $
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//
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// $NoKeywords: $
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//=============================================================================//
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#ifndef SPLINEPATCH_H
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#define SPLINEPATCH_H
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#pragma once
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#include "vector4D.h"
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//-----------------------------------------------------------------------------
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// Spline patch:
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//-----------------------------------------------------------------------------
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class CSplinePatch
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{
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public:
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// The last argument represents the number of float channels in addition to position
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CSplinePatch( );
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~CSplinePatch();
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// Call this to initialize the patch
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void Init( int w, int h, int extraChannels );
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// 0 = linear, 1 = spliney!
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void SetLinearBlend( float factor );
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// Hooks the patch up to externally controlled data...
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void SetControlPositions( Vector const** pPositions );
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void SetChannelData( int channel, float* pChannel );
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// This interface isn't wonderful; it's limited by optimization issues...
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// Call this before querying the patch for data at (i,j)
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void SetupPatchQuery( float i, float j );
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// Gets the point and normal at (i,j) specified above
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void GetPointAndNormal( Vector& position, Vector& normal ) const;
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// Gets at other channels
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float GetChannel( int channel ) const;
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// Gets at the dimensions
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int Width() const { return m_Width; }
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int Height() const { return m_Height; }
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public:
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// The integer + float values for the patch query
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int m_is, m_it;
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float m_fs, m_ft;
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private:
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enum
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{
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MAX_CHANNELS = 4
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};
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// no copy constructor
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CSplinePatch( const CSplinePatch& );
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// Computes indices of the samples to read for this interpolation
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void ComputeIndices( );
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// input data
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int m_Width;
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int m_Height;
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int m_ChannelCount;
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Vector const** m_ppPositions;
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float const* m_pChannel[MAX_CHANNELS];
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// temporary data used for a single patch query
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int m_SampleIndices[4][4];
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Vector4D m_SVec;
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Vector4D m_TVec;
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float m_LinearFactor;
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};
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#endif // SPLINEPATCH_H
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