244 lines
6.8 KiB
Plaintext
244 lines
6.8 KiB
Plaintext
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#include "../integer.hpp"
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namespace glm{
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namespace detail
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{
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template<length_t L, typename T, qualifier Q, bool compute = false>
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struct compute_ceilShift
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{
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GLM_FUNC_QUALIFIER static vec<L, T, Q> call(vec<L, T, Q> const& v, T)
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{
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return v;
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}
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};
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template<length_t L, typename T, qualifier Q>
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struct compute_ceilShift<L, T, Q, true>
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{
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GLM_FUNC_QUALIFIER static vec<L, T, Q> call(vec<L, T, Q> const& v, T Shift)
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{
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return v | (v >> Shift);
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}
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};
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template<length_t L, typename T, qualifier Q, bool isSigned = true>
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struct compute_ceilPowerOfTwo
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{
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GLM_FUNC_QUALIFIER static vec<L, T, Q> call(vec<L, T, Q> const& x)
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{
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GLM_STATIC_ASSERT(!std::numeric_limits<T>::is_iec559, "'ceilPowerOfTwo' only accept integer scalar or vector inputs");
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vec<L, T, Q> const Sign(sign(x));
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vec<L, T, Q> v(abs(x));
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v = v - static_cast<T>(1);
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v = v | (v >> static_cast<T>(1));
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v = v | (v >> static_cast<T>(2));
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v = v | (v >> static_cast<T>(4));
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v = compute_ceilShift<L, T, Q, sizeof(T) >= 2>::call(v, 8);
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v = compute_ceilShift<L, T, Q, sizeof(T) >= 4>::call(v, 16);
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v = compute_ceilShift<L, T, Q, sizeof(T) >= 8>::call(v, 32);
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return (v + static_cast<T>(1)) * Sign;
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}
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};
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template<length_t L, typename T, qualifier Q>
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struct compute_ceilPowerOfTwo<L, T, Q, false>
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{
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GLM_FUNC_QUALIFIER static vec<L, T, Q> call(vec<L, T, Q> const& x)
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{
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GLM_STATIC_ASSERT(!std::numeric_limits<T>::is_iec559, "'ceilPowerOfTwo' only accept integer scalar or vector inputs");
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vec<L, T, Q> v(x);
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v = v - static_cast<T>(1);
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v = v | (v >> static_cast<T>(1));
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v = v | (v >> static_cast<T>(2));
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v = v | (v >> static_cast<T>(4));
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v = compute_ceilShift<L, T, Q, sizeof(T) >= 2>::call(v, 8);
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v = compute_ceilShift<L, T, Q, sizeof(T) >= 4>::call(v, 16);
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v = compute_ceilShift<L, T, Q, sizeof(T) >= 8>::call(v, 32);
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return v + static_cast<T>(1);
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}
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};
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template<bool is_float, bool is_signed>
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struct compute_ceilMultiple{};
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template<>
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struct compute_ceilMultiple<true, true>
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{
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template<typename genType>
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GLM_FUNC_QUALIFIER static genType call(genType Source, genType Multiple)
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{
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if(Source > genType(0))
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return Source + (Multiple - std::fmod(Source, Multiple));
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else
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return Source + std::fmod(-Source, Multiple);
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}
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};
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template<>
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struct compute_ceilMultiple<false, false>
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{
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template<typename genType>
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GLM_FUNC_QUALIFIER static genType call(genType Source, genType Multiple)
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{
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genType Tmp = Source - genType(1);
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return Tmp + (Multiple - (Tmp % Multiple));
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}
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};
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template<>
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struct compute_ceilMultiple<false, true>
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{
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template<typename genType>
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GLM_FUNC_QUALIFIER static genType call(genType Source, genType Multiple)
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{
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assert(Multiple > genType(0));
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if(Source > genType(0))
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{
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genType Tmp = Source - genType(1);
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return Tmp + (Multiple - (Tmp % Multiple));
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}
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else
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return Source + (-Source % Multiple);
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}
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};
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template<bool is_float, bool is_signed>
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struct compute_floorMultiple{};
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template<>
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struct compute_floorMultiple<true, true>
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{
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template<typename genType>
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GLM_FUNC_QUALIFIER static genType call(genType Source, genType Multiple)
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{
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if(Source >= genType(0))
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return Source - std::fmod(Source, Multiple);
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else
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return Source - std::fmod(Source, Multiple) - Multiple;
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}
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};
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template<>
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struct compute_floorMultiple<false, false>
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{
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template<typename genType>
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GLM_FUNC_QUALIFIER static genType call(genType Source, genType Multiple)
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{
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if(Source >= genType(0))
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return Source - Source % Multiple;
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else
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{
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genType Tmp = Source + genType(1);
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return Tmp - Tmp % Multiple - Multiple;
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}
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}
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};
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template<>
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struct compute_floorMultiple<false, true>
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{
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template<typename genType>
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GLM_FUNC_QUALIFIER static genType call(genType Source, genType Multiple)
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{
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if(Source >= genType(0))
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return Source - Source % Multiple;
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else
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{
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genType Tmp = Source + genType(1);
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return Tmp - Tmp % Multiple - Multiple;
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}
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}
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};
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}//namespace detail
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template<typename genIUType>
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GLM_FUNC_QUALIFIER bool isPowerOfTwo(genIUType Value)
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{
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GLM_STATIC_ASSERT(std::numeric_limits<genIUType>::is_integer, "'isPowerOfTwo' only accept integer inputs");
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genIUType const Result = glm::abs(Value);
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return !(Result & (Result - 1));
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}
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template<typename genIUType>
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GLM_FUNC_QUALIFIER genIUType nextPowerOfTwo(genIUType value)
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{
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GLM_STATIC_ASSERT(std::numeric_limits<genIUType>::is_integer, "'nextPowerOfTwo' only accept integer inputs");
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return detail::compute_ceilPowerOfTwo<1, genIUType, defaultp, std::numeric_limits<genIUType>::is_signed>::call(vec<1, genIUType, defaultp>(value)).x;
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}
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template<typename genIUType>
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GLM_FUNC_QUALIFIER genIUType prevPowerOfTwo(genIUType value)
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{
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GLM_STATIC_ASSERT(std::numeric_limits<genIUType>::is_integer, "'prevPowerOfTwo' only accept integer inputs");
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return isPowerOfTwo(value) ? value : static_cast<genIUType>(static_cast<genIUType>(1) << static_cast<genIUType>(findMSB(value)));
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}
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template<typename genIUType>
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GLM_FUNC_QUALIFIER bool isMultiple(genIUType Value, genIUType Multiple)
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{
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GLM_STATIC_ASSERT(std::numeric_limits<genIUType>::is_integer, "'isMultiple' only accept integer inputs");
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return isMultiple(vec<1, genIUType>(Value), vec<1, genIUType>(Multiple)).x;
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}
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template<typename genIUType>
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GLM_FUNC_QUALIFIER genIUType nextMultiple(genIUType Source, genIUType Multiple)
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{
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GLM_STATIC_ASSERT(std::numeric_limits<genIUType>::is_integer, "'nextMultiple' only accept integer inputs");
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return detail::compute_ceilMultiple<std::numeric_limits<genIUType>::is_iec559, std::numeric_limits<genIUType>::is_signed>::call(Source, Multiple);
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}
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template<typename genIUType>
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GLM_FUNC_QUALIFIER genIUType prevMultiple(genIUType Source, genIUType Multiple)
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{
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GLM_STATIC_ASSERT(std::numeric_limits<genIUType>::is_integer, "'prevMultiple' only accept integer inputs");
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return detail::compute_floorMultiple<std::numeric_limits<genIUType>::is_iec559, std::numeric_limits<genIUType>::is_signed>::call(Source, Multiple);
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}
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template<typename genIUType>
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GLM_FUNC_QUALIFIER int findNSB(genIUType x, int significantBitCount)
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{
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GLM_STATIC_ASSERT(std::numeric_limits<genIUType>::is_integer, "'findNSB' only accept integer inputs");
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if(bitCount(x) < significantBitCount)
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return -1;
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genIUType const One = static_cast<genIUType>(1);
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int bitPos = 0;
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genIUType key = x;
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int nBitCount = significantBitCount;
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int Step = sizeof(x) * 8 / 2;
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while (key > One)
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{
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genIUType Mask = static_cast<genIUType>((One << Step) - One);
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genIUType currentKey = key & Mask;
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int currentBitCount = bitCount(currentKey);
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if (nBitCount > currentBitCount)
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{
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nBitCount -= currentBitCount;
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bitPos += Step;
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key >>= static_cast<genIUType>(Step);
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}
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else
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{
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key = key & Mask;
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}
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Step >>= 1;
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}
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return static_cast<int>(bitPos);
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}
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}//namespace glm
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