51 lines
1.2 KiB
C++
51 lines
1.2 KiB
C++
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#pragma once
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#include "setup.hpp"
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#include <limits>
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namespace glm{
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namespace detail
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{
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template<typename genFIType, bool /*signed*/>
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struct compute_abs
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{};
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template<typename genFIType>
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struct compute_abs<genFIType, true>
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{
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GLM_FUNC_QUALIFIER GLM_CONSTEXPR static genFIType call(genFIType x)
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{
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GLM_STATIC_ASSERT(
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std::numeric_limits<genFIType>::is_iec559 || std::numeric_limits<genFIType>::is_signed,
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"'abs' only accept floating-point and integer scalar or vector inputs");
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return x >= genFIType(0) ? x : -x;
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// TODO, perf comp with: *(((int *) &x) + 1) &= 0x7fffffff;
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}
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};
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#if GLM_COMPILER & GLM_COMPILER_CUDA
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template<>
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struct compute_abs<float, true>
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{
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GLM_FUNC_QUALIFIER GLM_CONSTEXPR static float call(float x)
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{
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return fabsf(x);
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}
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};
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#endif
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template<typename genFIType>
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struct compute_abs<genFIType, false>
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{
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GLM_FUNC_QUALIFIER GLM_CONSTEXPR static genFIType call(genFIType x)
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{
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GLM_STATIC_ASSERT(
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(!std::numeric_limits<genFIType>::is_signed && std::numeric_limits<genFIType>::is_integer),
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"'abs' only accept floating-point and integer scalar or vector inputs");
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return x;
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}
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};
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}//namespace detail
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}//namespace glm
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