57 lines
1.8 KiB
C++
57 lines
1.8 KiB
C++
///////////////////////////////////////////////////////////////////////////////
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// Copyright (C) Microsoft Corporation, 1998.
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//
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// EdgeFunc.hpp
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//
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// Direct3D Reference Rasterizer - Edge Function Processing
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//
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///////////////////////////////////////////////////////////////////////////////
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#ifndef _EDGEFUNC_HPP
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#define _EDGEFUNC_HPP
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//-----------------------------------------------------------------------------
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//
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// Utility to compute determinant - must be computed in manner consistent with
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// other edge function processing.
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//
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//-----------------------------------------------------------------------------
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FLOAT
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ComputeDeterminant(
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FLOAT fX0, FLOAT fY0,
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FLOAT fX1, FLOAT fY1,
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FLOAT fX2, FLOAT fY2 );
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//-----------------------------------------------------------------------------
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//
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// Primitive edge function - Computes, stores, and evaluates linear function
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// for edges. Basic function is stored in fixed point. Gradient sign terms
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// are computed and stored separately to adhere to fill rules.
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//
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//-----------------------------------------------------------------------------
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class RREdgeFunc
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{
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private:
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INT32 m_iA; // n.4 fixed point
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INT32 m_iB; // n.4 fixed point
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INT64 m_iC; // n.8 fixed point
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BOOL m_bAPos; // carefully computed signs of A,B
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BOOL m_bBPos;
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public:
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// DEFINE
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void Set(
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FLOAT fX0, FLOAT fY0, FLOAT fX1, FLOAT fY1,
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FLOAT fDet, BOOL bFragProcEnable );
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// Point Sampling Test
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// returns 0000=outside, FFFF=inside
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RRCvgMask PSTest( INT16 iX, INT16 iY );
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// Anti Alias test
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// returns coverage mask (0000=outside, FFFF=completely inside, partial otherwise)
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RRCvgMask AATest( INT16 iX, INT16 iY );
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};
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//////////////////////////////////////////////////////////////////////////////
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#endif // _EDGEFUNC_HPP
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