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73 lines
1.8 KiB
C++
73 lines
1.8 KiB
C++
/*
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* All or portions of this file Copyright (c) Amazon.com, Inc. or its affiliates or
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* its licensors.
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*
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* For complete copyright and license terms please see the LICENSE at the root of this
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* distribution (the "License"). All use of this software is governed by the License,
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* or, if provided, by the license below or the license accompanying this file. Do not
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* remove or modify any license notices. This file is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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*
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*/
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// Original file Copyright Crytek GMBH or its affiliates, used under license.
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#ifndef CRYINCLUDE_CRYCOMMONTOOLS_MATHHELPERS_H
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#define CRYINCLUDE_CRYCOMMONTOOLS_MATHHELPERS_H
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#pragma once
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#include <float.h>
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#if (_M_IX86_FP > 0)
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#include <intrin.h>
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#endif
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namespace MathHelpers
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{
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#if (_M_IX86_FP > 0)
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inline int FastRoundFloatTowardZero(float f)
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{
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return _mm_cvtt_ss2si(_mm_set_ss(f));
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}
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#else
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inline int FastRoundFloatTowardZero(float f)
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{
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return int(f);
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}
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#endif
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#if defined(AZ_PLATFORM_WINDOWS)
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inline unsigned int EnableFloatingPointExceptions(unsigned int mask)
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{
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_clearfp();
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unsigned int oldMask;
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_controlfp_s(&oldMask, 0, 0);
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unsigned int newMask;
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_controlfp_s(&newMask, ~mask, _MCW_EM);
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return ~oldMask;
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}
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class AutoFloatingPointExceptions
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{
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public:
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AutoFloatingPointExceptions(const unsigned int mask)
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: m_mask(EnableFloatingPointExceptions(mask))
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{
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}
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~AutoFloatingPointExceptions()
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{
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EnableFloatingPointExceptions(m_mask);
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}
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private:
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unsigned int m_mask;
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};
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#endif //AZ_PLATFORM_WINDOWS
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}
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#endif // CRYINCLUDE_CRYCOMMONTOOLS_MATHHELPERS_H
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