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Diffstat (limited to 'public/bitmap/cubemap.h')
| -rw-r--r-- | public/bitmap/cubemap.h | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/public/bitmap/cubemap.h b/public/bitmap/cubemap.h new file mode 100644 index 0000000..1bda06f --- /dev/null +++ b/public/bitmap/cubemap.h @@ -0,0 +1,68 @@ +//========= Copyright Valve Corporation, All rights reserved. ============// +// +// Purpose: a class for performing cube-mapped spherical sample lookups. +// +// $Workfile: $ +// $Date: $ +// $NoKeywords: $ +//===========================================================================// + +#ifndef CUBEMAP_H +#define CUBEMAP_H + +#ifdef _WIN32 +#pragma once +#endif + +#include "tier0/platform.h" +#include "tier1/utlmemory.h" +#include "mathlib/mathlib.h" + +template<class T, int RES> struct CCubeMap +{ + T m_Samples[6][RES][RES]; + +public: + FORCEINLINE void GetCoords( Vector const &vecNormalizedDirection, int &nX, int &nY, int &nFace ) + { + // find largest magnitude component + int nLargest = 0; + int nAxis0 = 1; + int nAxis1 = 2; + if ( fabs( vecNormalizedDirection[1] ) > fabs( vecNormalizedDirection[0] ) ) + { + nLargest = 1; + nAxis0 = 0; + nAxis1 = 2; + } + if ( fabs( vecNormalizedDirection[2] ) > fabs( vecNormalizedDirection[nLargest] ) ) + { + nLargest = 2; + nAxis0 = 0; + nAxis1 = 1; + } + float flZ = vecNormalizedDirection[nLargest]; + if ( flZ < 0 ) + { + flZ = - flZ; + nLargest += 3; + } + nFace = nLargest; + flZ = 1.0 / flZ; + nX = RemapValClamped( vecNormalizedDirection[nAxis0] * flZ, -1, 1, 0, RES - 1 ); + nY = RemapValClamped( vecNormalizedDirection[nAxis1] * flZ, -1, 1, 0, RES - 1 ); + } + + FORCEINLINE T & GetSample( Vector const &vecNormalizedDirection ) + { + int nX, nY, nFace; + GetCoords( vecNormalizedDirection, nX, nY, nFace ); + return m_Samples[nFace][nX][nY]; + } +}; + + + + + +#endif // CUBEMAP_H |