345 lines
10 KiB
Text
345 lines
10 KiB
Text
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/// @ref gtc_round
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/// @file glm/gtc/round.inl
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#include "../detail/func_integer.hpp"
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namespace glm{
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namespace detail
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{
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template <typename T, precision P, template <typename, precision> class vecType, bool compute = false>
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struct compute_ceilShift
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{
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GLM_FUNC_QUALIFIER static vecType<T, P> call(vecType<T, P> 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 <typename T, precision P, template <typename, precision> class vecType>
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struct compute_ceilShift<T, P, vecType, true>
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{
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GLM_FUNC_QUALIFIER static vecType<T, P> call(vecType<T, P> 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 <typename T, precision P, template <typename, precision> class vecType, bool isSigned = true>
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struct compute_ceilPowerOfTwo
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{
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GLM_FUNC_QUALIFIER static vecType<T, P> call(vecType<T, P> 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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vecType<T, P> const Sign(sign(x));
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vecType<T, P> 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<T, P, vecType, sizeof(T) >= 2>::call(v, 8);
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v = compute_ceilShift<T, P, vecType, sizeof(T) >= 4>::call(v, 16);
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v = compute_ceilShift<T, P, vecType, 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 <typename T, precision P, template <typename, precision> class vecType>
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struct compute_ceilPowerOfTwo<T, P, vecType, false>
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{
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GLM_FUNC_QUALIFIER static vecType<T, P> call(vecType<T, P> 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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vecType<T, P> 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<T, P, vecType, sizeof(T) >= 2>::call(v, 8);
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v = compute_ceilShift<T, P, vecType, sizeof(T) >= 4>::call(v, 16);
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v = compute_ceilShift<T, P, vecType, 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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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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template <bool is_float, bool is_signed>
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struct compute_roundMultiple{};
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template <>
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struct compute_roundMultiple<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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{
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genType Tmp = Source + genType(1);
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return Tmp - std::fmod(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_roundMultiple<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_roundMultiple<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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////////////////
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// isPowerOfTwo
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template <typename genType>
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GLM_FUNC_QUALIFIER bool isPowerOfTwo(genType Value)
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{
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genType const Result = glm::abs(Value);
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return !(Result & (Result - 1));
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}
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template <typename T, precision P, template <typename, precision> class vecType>
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GLM_FUNC_QUALIFIER vecType<bool, P> isPowerOfTwo(vecType<T, P> const & Value)
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{
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vecType<T, P> const Result(abs(Value));
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return equal(Result & (Result - 1), vecType<T, P>(0));
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}
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//////////////////
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// ceilPowerOfTwo
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template <typename genType>
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GLM_FUNC_QUALIFIER genType ceilPowerOfTwo(genType value)
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{
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return detail::compute_ceilPowerOfTwo<genType, defaultp, tvec1, std::numeric_limits<genType>::is_signed>::call(tvec1<genType, defaultp>(value)).x;
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}
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template <typename T, precision P, template <typename, precision> class vecType>
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GLM_FUNC_QUALIFIER vecType<T, P> ceilPowerOfTwo(vecType<T, P> const & v)
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{
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return detail::compute_ceilPowerOfTwo<T, P, vecType, std::numeric_limits<T>::is_signed>::call(v);
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}
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///////////////////
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// floorPowerOfTwo
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template <typename genType>
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GLM_FUNC_QUALIFIER genType floorPowerOfTwo(genType value)
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{
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return isPowerOfTwo(value) ? value : static_cast<genType>(1) << findMSB(value);
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}
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template <typename T, precision P, template <typename, precision> class vecType>
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GLM_FUNC_QUALIFIER vecType<T, P> floorPowerOfTwo(vecType<T, P> const & v)
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{
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return detail::functor1<T, T, P, vecType>::call(floorPowerOfTwo, v);
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}
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///////////////////
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// roundPowerOfTwo
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template <typename genIUType>
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GLM_FUNC_QUALIFIER genIUType roundPowerOfTwo(genIUType value)
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{
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if(isPowerOfTwo(value))
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return value;
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genIUType const prev = static_cast<genIUType>(1) << findMSB(value);
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genIUType const next = prev << static_cast<genIUType>(1);
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return (next - value) < (value - prev) ? next : prev;
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}
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template <typename T, precision P, template <typename, precision> class vecType>
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GLM_FUNC_QUALIFIER vecType<T, P> roundPowerOfTwo(vecType<T, P> const & v)
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{
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return detail::functor1<T, T, P, vecType>::call(roundPowerOfTwo, v);
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}
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////////////////
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// isMultiple
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template <typename genType>
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GLM_FUNC_QUALIFIER bool isMultiple(genType Value, genType Multiple)
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{
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return isMultiple(tvec1<genType>(Value), tvec1<genType>(Multiple)).x;
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}
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template <typename T, precision P, template <typename, precision> class vecType>
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GLM_FUNC_QUALIFIER vecType<bool, P> isMultiple(vecType<T, P> const & Value, T Multiple)
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{
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return (Value % Multiple) == vecType<T, P>(0);
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}
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template <typename T, precision P, template <typename, precision> class vecType>
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GLM_FUNC_QUALIFIER vecType<bool, P> isMultiple(vecType<T, P> const & Value, vecType<T, P> const & Multiple)
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{
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return (Value % Multiple) == vecType<T, P>(0);
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}
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//////////////////////
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// ceilMultiple
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template <typename genType>
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GLM_FUNC_QUALIFIER genType ceilMultiple(genType Source, genType Multiple)
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{
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return detail::compute_ceilMultiple<std::numeric_limits<genType>::is_iec559, std::numeric_limits<genType>::is_signed>::call(Source, Multiple);
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}
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template <typename T, precision P, template <typename, precision> class vecType>
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GLM_FUNC_QUALIFIER vecType<T, P> ceilMultiple(vecType<T, P> const & Source, vecType<T, P> const & Multiple)
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{
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return detail::functor2<T, P, vecType>::call(ceilMultiple, Source, Multiple);
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}
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//////////////////////
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// floorMultiple
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template <typename genType>
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GLM_FUNC_QUALIFIER genType floorMultiple(genType Source, genType Multiple)
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{
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return detail::compute_floorMultiple<std::numeric_limits<genType>::is_iec559, std::numeric_limits<genType>::is_signed>::call(Source, Multiple);
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}
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template <typename T, precision P, template <typename, precision> class vecType>
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GLM_FUNC_QUALIFIER vecType<T, P> floorMultiple(vecType<T, P> const & Source, vecType<T, P> const & Multiple)
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{
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return detail::functor2<T, P, vecType>::call(floorMultiple, Source, Multiple);
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}
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//////////////////////
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// roundMultiple
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template <typename genType>
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GLM_FUNC_QUALIFIER genType roundMultiple(genType Source, genType Multiple)
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{
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return detail::compute_roundMultiple<std::numeric_limits<genType>::is_iec559, std::numeric_limits<genType>::is_signed>::call(Source, Multiple);
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}
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template <typename T, precision P, template <typename, precision> class vecType>
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GLM_FUNC_QUALIFIER vecType<T, P> roundMultiple(vecType<T, P> const & Source, vecType<T, P> const & Multiple)
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{
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return detail::functor2<T, P, vecType>::call(roundMultiple, Source, Multiple);
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}
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}//namespace glm
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