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601 lines
14 KiB
C++
601 lines
14 KiB
C++
///////////////////////////////////////////////////////////////////////////////////////////////////
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// OpenGL Mathematics Copyright (c) 2005 - 2013 G-Truc Creation (www.g-truc.net)
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///////////////////////////////////////////////////////////////////////////////////////////////////
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// Created : 2007-03-14
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// Updated : 2008-11-14
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// Licence : This source is under MIT License
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// File : glm/gtx/bit.inl
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///////////////////////////////////////////////////////////////////////////////////////////////////
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namespace glm
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{
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template <typename genIType>
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GLM_FUNC_QUALIFIER genIType mask
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(
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genIType const & count
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)
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{
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return ((genIType(1) << (count)) - genIType(1));
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}
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VECTORIZE_VEC(mask)
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// extractField
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template <typename genIType>
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GLM_FUNC_QUALIFIER genIType extractField
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(
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half const & value,
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genIType const & first,
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genIType const & count
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)
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{
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assert(first + count < sizeof(half));
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return (value._data() << first) >> ((sizeof(half) << 3) - count);
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}
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template <typename genIType>
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GLM_FUNC_QUALIFIER genIType extractField
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(
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float const & value,
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genIType const & first,
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genIType const & count
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)
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{
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assert(first + count < sizeof(float));
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return (detail::uif32(value).i << first) >> ((sizeof(float) << 3) - count);
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}
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template <typename genIType>
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GLM_FUNC_QUALIFIER genIType extractField
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(
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double const & value,
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genIType const & first,
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genIType const & count
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)
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{
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assert(first + count < sizeof(double));
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return (detail::uif64(value).i << first) >> ((sizeof(double) << genIType(3)) - count);
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}
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template <typename genIUType, typename sizeType>
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GLM_FUNC_QUALIFIER genIUType extractField
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(
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genIUType const & Value,
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sizeType const & First,
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sizeType const & Count
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)
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{
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sizeType GenSize = sizeof(genIUType) << 3;
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assert(First + Count <= GenSize);
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genIUType ShiftLeft = Count ? Value << (GenSize - (Count + First)) : 0;
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genIUType ShiftBack = ShiftLeft >> genIUType(GenSize - Count);
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return ShiftBack;
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}
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template <typename genIUType, typename sizeType>
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GLM_FUNC_QUALIFIER detail::tvec2<genIUType> extractField
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(
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detail::tvec2<genIUType> const & value,
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sizeType const & first,
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sizeType const & count
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)
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{
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return detail::tvec2<genIUType>(
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extractField(value[0], first, count),
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extractField(value[1], first, count));
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}
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template <typename genIUType, typename sizeType>
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GLM_FUNC_QUALIFIER detail::tvec3<genIUType> extractField
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(
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detail::tvec3<genIUType> const & value,
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sizeType const & first,
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sizeType const & count
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)
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{
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return detail::tvec3<genIUType>(
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extractField(value[0], first, count),
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extractField(value[1], first, count),
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extractField(value[2], first, count));
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}
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template <typename genIUType, typename sizeType>
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GLM_FUNC_QUALIFIER detail::tvec4<genIUType> extractField
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(
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detail::tvec4<genIUType> const & value,
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sizeType const & first,
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sizeType const & count
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)
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{
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return detail::tvec4<genIUType>(
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extractField(value[0], first, count),
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extractField(value[1], first, count),
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extractField(value[2], first, count),
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extractField(value[3], first, count));
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}
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template <typename genIUType, typename sizeType>
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GLM_FUNC_QUALIFIER detail::tvec2<genIUType> extractField
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(
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detail::tvec2<genIUType> const & value,
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detail::tvec2<sizeType> const & first,
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detail::tvec2<sizeType> const & count
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)
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{
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return detail::tvec2<genIUType>(
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extractField(value[0], first[0], count[0]),
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extractField(value[1], first[1], count[1]));
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}
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template <typename genIUType, typename sizeType>
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GLM_FUNC_QUALIFIER detail::tvec3<genIUType> extractField
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(
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detail::tvec3<genIUType> const & value,
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detail::tvec3<sizeType> const & first,
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detail::tvec3<sizeType> const & count
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)
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{
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return detail::tvec3<genIUType>(
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extractField(value[0], first[0], count[0]),
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extractField(value[1], first[1], count[1]),
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extractField(value[2], first[2], count[2]));
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}
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template <typename genIUType, typename sizeType>
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GLM_FUNC_QUALIFIER detail::tvec4<genIUType> extractField
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(
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detail::tvec4<genIUType> const & value,
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detail::tvec4<sizeType> const & first,
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detail::tvec4<sizeType> const & count
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)
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{
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return detail::tvec4<genIUType>(
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extractField(value[0], first[0], count[0]),
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extractField(value[1], first[1], count[1]),
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extractField(value[2], first[2], count[2]),
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extractField(value[3], first[3], count[3]));
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}
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template <typename genIUType, typename sizeType>
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GLM_FUNC_QUALIFIER detail::tvec2<genIUType> extractField
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(
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genIUType const & value,
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detail::tvec2<sizeType> const & first,
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detail::tvec2<sizeType> const & count
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)
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{
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return detail::tvec2<genIUType>(
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extractField(value, first[0], count[0]),
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extractField(value, first[1], count[1]));
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}
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template <typename genIUType, typename sizeType>
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GLM_FUNC_QUALIFIER detail::tvec3<genIUType> extractField
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(
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genIUType const & value,
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detail::tvec3<sizeType> const & first,
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detail::tvec3<sizeType> const & count
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)
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{
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return detail::tvec3<genIUType>(
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extractField(value, first[0], count[0]),
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extractField(value, first[1], count[1]),
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extractField(value, first[2], count[2]));
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}
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template <typename genIUType, typename sizeType>
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GLM_FUNC_QUALIFIER detail::tvec4<genIUType> extractField
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(
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genIUType const & value,
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detail::tvec4<sizeType> const & first,
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detail::tvec4<sizeType> const & count
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)
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{
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return detail::tvec4<genIUType>(
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extractField(value, first[0], count[0]),
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extractField(value, first[1], count[1]),
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extractField(value, first[2], count[2]),
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extractField(value, first[3], count[3]));
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}
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// lowestBit
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template <typename genType>
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GLM_FUNC_QUALIFIER int lowestBit
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(
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genType const & Value
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)
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{
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assert(Value != genType(0)); // not valid call
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genType Bit;
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for(Bit = genType(0); !(Value & (1 << Bit)); ++Bit){}
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return Bit;
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}
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template <typename valType>
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GLM_FUNC_QUALIFIER detail::tvec2<int> lowestBit
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(
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detail::tvec2<valType> const & value
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)
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{
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return detail::tvec2<int>(
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lowestBit(value[0]),
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lowestBit(value[1]));
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}
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template <typename valType>
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GLM_FUNC_QUALIFIER detail::tvec3<int> lowestBit
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(
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detail::tvec3<valType> const & value
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)
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{
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return detail::tvec3<int>(
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lowestBit(value[0]),
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lowestBit(value[1]),
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lowestBit(value[2]));
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}
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template <typename valType>
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GLM_FUNC_QUALIFIER detail::tvec4<int> lowestBit
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(
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detail::tvec4<valType> const & value
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)
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{
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return detail::tvec4<int>(
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lowestBit(value[0]),
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lowestBit(value[1]),
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lowestBit(value[2]),
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lowestBit(value[3]));
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}
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// highestBit
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template <typename genType>
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GLM_FUNC_QUALIFIER int highestBit
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(
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genType const & value
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)
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{
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assert(value != genType(0)); // not valid call
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genType bit = genType(-1);
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for(genType tmp = value; tmp; tmp >>= 1, ++bit){}
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return bit;
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}
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//template <>
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//GLM_FUNC_QUALIFIER int highestBit<int>
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//(
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// int value
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//)
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//{
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// int bit = -1;
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// for(int tmp = value; tmp; tmp >>= 1, ++bit);
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// return bit;
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//}
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template <typename valType>
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GLM_FUNC_QUALIFIER detail::tvec2<int> highestBit
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(
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detail::tvec2<valType> const & value
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)
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{
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return detail::tvec2<int>(
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highestBit(value[0]),
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highestBit(value[1]));
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}
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template <typename valType>
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GLM_FUNC_QUALIFIER detail::tvec3<int> highestBit
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(
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detail::tvec3<valType> const & value
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)
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{
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return detail::tvec3<int>(
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highestBit(value[0]),
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highestBit(value[1]),
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highestBit(value[2]));
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}
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template <typename valType>
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GLM_FUNC_QUALIFIER detail::tvec4<int> highestBit
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(
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detail::tvec4<valType> const & value
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)
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{
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return detail::tvec4<int>(
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highestBit(value[0]),
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highestBit(value[1]),
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highestBit(value[2]),
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highestBit(value[3]));
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}
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// highestBitValue
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template <typename genType>
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GLM_FUNC_QUALIFIER genType highestBitValue
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(
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genType const & value
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)
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{
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genType tmp = value;
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genType result = genType(0);
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while(tmp)
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{
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result = (tmp & (~tmp + 1)); // grab lowest bit
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tmp &= ~result; // clear lowest bit
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}
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return result;
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}
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template <typename valType>
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GLM_FUNC_QUALIFIER detail::tvec2<int> highestBitValue
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(
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detail::tvec2<valType> const & value
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)
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{
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return detail::tvec2<int>(
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highestBitValue(value[0]),
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highestBitValue(value[1]));
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}
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template <typename valType>
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GLM_FUNC_QUALIFIER detail::tvec3<int> highestBitValue
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(
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detail::tvec3<valType> const & value
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)
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{
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return detail::tvec3<int>(
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highestBitValue(value[0]),
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highestBitValue(value[1]),
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highestBitValue(value[2]));
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}
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template <typename valType>
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GLM_FUNC_QUALIFIER detail::tvec4<int> highestBitValue
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(
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detail::tvec4<valType> const & value
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)
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{
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return detail::tvec4<int>(
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highestBitValue(value[0]),
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highestBitValue(value[1]),
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highestBitValue(value[2]),
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highestBitValue(value[3]));
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}
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// isPowerOfTwo
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template <typename genType>
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GLM_FUNC_QUALIFIER bool isPowerOfTwo(genType const & Value)
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{
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//detail::If<std::numeric_limits<genType>::is_signed>::apply(abs, Value);
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//return !(Value & (Value - 1));
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// For old complier?
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genType Result = Value;
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if(std::numeric_limits<genType>::is_signed)
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Result = abs(Result);
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return !(Result & (Result - 1));
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}
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template <typename valType>
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GLM_FUNC_QUALIFIER detail::tvec2<bool> isPowerOfTwo
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(
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detail::tvec2<valType> const & value
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)
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{
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return detail::tvec2<bool>(
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isPowerOfTwo(value[0]),
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isPowerOfTwo(value[1]));
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}
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template <typename valType>
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GLM_FUNC_QUALIFIER detail::tvec3<bool> isPowerOfTwo
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(
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detail::tvec3<valType> const & value
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)
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{
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return detail::tvec3<bool>(
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isPowerOfTwo(value[0]),
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isPowerOfTwo(value[1]),
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isPowerOfTwo(value[2]));
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}
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template <typename valType>
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GLM_FUNC_QUALIFIER detail::tvec4<bool> isPowerOfTwo
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(
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detail::tvec4<valType> const & value
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)
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{
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return detail::tvec4<bool>(
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isPowerOfTwo(value[0]),
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isPowerOfTwo(value[1]),
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isPowerOfTwo(value[2]),
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isPowerOfTwo(value[3]));
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}
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// powerOfTwoAbove
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template <typename genType>
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GLM_FUNC_QUALIFIER genType powerOfTwoAbove(genType const & value)
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{
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return isPowerOfTwo(value) ? value : highestBitValue(value) << 1;
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}
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VECTORIZE_VEC(powerOfTwoAbove)
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// powerOfTwoBelow
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template <typename genType>
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GLM_FUNC_QUALIFIER genType powerOfTwoBelow
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(
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genType const & value
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)
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{
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return isPowerOfTwo(value) ? value : highestBitValue(value);
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}
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VECTORIZE_VEC(powerOfTwoBelow)
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// powerOfTwoNearest
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template <typename genType>
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GLM_FUNC_QUALIFIER genType powerOfTwoNearest
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(
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genType const & value
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)
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{
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if(isPowerOfTwo(value))
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return value;
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genType prev = highestBitValue(value);
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genType next = prev << 1;
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return (next - value) < (value - prev) ? next : prev;
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}
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VECTORIZE_VEC(powerOfTwoNearest)
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template <typename genType>
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GLM_FUNC_QUALIFIER genType bitRevert(genType const & In)
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{
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GLM_STATIC_ASSERT(std::numeric_limits<genType>::is_integer, "'bitRevert' only accept integer values");
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genType Out = 0;
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std::size_t BitSize = sizeof(genType) * 8;
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for(std::size_t i = 0; i < BitSize; ++i)
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if(In & (genType(1) << i))
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Out |= genType(1) << (BitSize - 1 - i);
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return Out;
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}
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VECTORIZE_VEC(bitRevert)
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template <typename genType>
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GLM_FUNC_QUALIFIER genType bitRotateRight(genType const & In, std::size_t Shift)
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{
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GLM_STATIC_ASSERT(std::numeric_limits<genType>::is_integer, "'bitRotateRight' only accept integer values");
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std::size_t BitSize = sizeof(genType) * 8;
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return (In << Shift) | (In >> (BitSize - Shift));
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}
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template <typename valType>
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GLM_FUNC_QUALIFIER detail::tvec2<valType> bitRotateRight
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(
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detail::tvec2<valType> const & Value,
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std::size_t Shift
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)
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{
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return detail::tvec2<valType>(
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bitRotateRight(Value[0], Shift),
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bitRotateRight(Value[1], Shift));
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}
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template <typename valType>
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GLM_FUNC_QUALIFIER detail::tvec3<valType> bitRotateRight
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|
(
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detail::tvec3<valType> const & Value,
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std::size_t Shift
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)
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|
{
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return detail::tvec3<valType>(
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bitRotateRight(Value[0], Shift),
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bitRotateRight(Value[1], Shift),
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bitRotateRight(Value[2], Shift));
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}
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template <typename valType>
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GLM_FUNC_QUALIFIER detail::tvec4<valType> bitRotateRight
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|
(
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detail::tvec4<valType> const & Value,
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std::size_t Shift
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)
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|
{
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return detail::tvec4<valType>(
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bitRotateRight(Value[0], Shift),
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bitRotateRight(Value[1], Shift),
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bitRotateRight(Value[2], Shift),
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bitRotateRight(Value[3], Shift));
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}
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template <typename genType>
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GLM_FUNC_QUALIFIER genType bitRotateLeft(genType const & In, std::size_t Shift)
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|
{
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GLM_STATIC_ASSERT(std::numeric_limits<genType>::is_integer, "'bitRotateLeft' only accept integer values");
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std::size_t BitSize = sizeof(genType) * 8;
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return (In >> Shift) | (In << (BitSize - Shift));
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}
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template <typename valType>
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GLM_FUNC_QUALIFIER detail::tvec2<valType> bitRotateLeft
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|
(
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detail::tvec2<valType> const & Value,
|
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std::size_t Shift
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|
)
|
|
{
|
|
return detail::tvec2<valType>(
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bitRotateLeft(Value[0], Shift),
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bitRotateLeft(Value[1], Shift));
|
|
}
|
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template <typename valType>
|
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GLM_FUNC_QUALIFIER detail::tvec3<valType> bitRotateLeft
|
|
(
|
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detail::tvec3<valType> const & Value,
|
|
std::size_t Shift
|
|
)
|
|
{
|
|
return detail::tvec3<valType>(
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bitRotateLeft(Value[0], Shift),
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|
bitRotateLeft(Value[1], Shift),
|
|
bitRotateLeft(Value[2], Shift));
|
|
}
|
|
|
|
template <typename valType>
|
|
GLM_FUNC_QUALIFIER detail::tvec4<valType> bitRotateLeft
|
|
(
|
|
detail::tvec4<valType> const & Value,
|
|
std::size_t Shift
|
|
)
|
|
{
|
|
return detail::tvec4<valType>(
|
|
bitRotateLeft(Value[0], Shift),
|
|
bitRotateLeft(Value[1], Shift),
|
|
bitRotateLeft(Value[2], Shift),
|
|
bitRotateLeft(Value[3], Shift));
|
|
}
|
|
|
|
template <typename genIUType>
|
|
GLM_FUNC_QUALIFIER genIUType fillBitfieldWithOne
|
|
(
|
|
genIUType const & Value,
|
|
int const & FromBit,
|
|
int const & ToBit
|
|
)
|
|
{
|
|
assert(FromBit <= ToBit);
|
|
assert(ToBit <= sizeof(genIUType) * std::size_t(8));
|
|
|
|
genIUType Result = Value;
|
|
for(std::size_t i = 0; i <= ToBit; ++i)
|
|
Result |= (1 << i);
|
|
return Result;
|
|
}
|
|
|
|
template <typename genIUType>
|
|
GLM_FUNC_QUALIFIER genIUType fillBitfieldWithZero
|
|
(
|
|
genIUType const & Value,
|
|
int const & FromBit,
|
|
int const & ToBit
|
|
)
|
|
{
|
|
assert(FromBit <= ToBit);
|
|
assert(ToBit <= sizeof(genIUType) * std::size_t(8));
|
|
|
|
genIUType Result = Value;
|
|
for(std::size_t i = 0; i <= ToBit; ++i)
|
|
Result &= ~(1 << i);
|
|
return Result;
|
|
}
|
|
}//namespace glm
|