compute_common.hpp
#pragma once
#include "setup.hpp"
#include <limits>
namespace glm{
namespace detail
{
template<typename genFIType, bool /*signed*/>
struct compute_abs
{};
template<typename genFIType>
struct compute_abs<genFIType, true>
{
GLM_FUNC_QUALIFIER GLM_CONSTEXPR static genFIType call(genFIType x)
{
GLM_STATIC_ASSERT(
std::numeric_limits<genFIType>::is_iec559 || std::numeric_limits<genFIType>::is_signed,
"'abs' only accept floating-point and integer scalar or vector inputs");
return x >= genFIType(0) ? x : -x;
// TODO, perf comp with: *(((int *) &x) + 1) &= 0x7fffffff;
}
};
#if GLM_COMPILER & GLM_COMPILER_CUDA
template<>
struct compute_abs<float, true>
{
GLM_FUNC_QUALIFIER GLM_CONSTEXPR static float call(float x)
{
return fabsf(x);
}
};
#endif
template<typename genFIType>
struct compute_abs<genFIType, false>
{
GLM_FUNC_QUALIFIER GLM_CONSTEXPR static genFIType call(genFIType x)
{
GLM_STATIC_ASSERT(
(!std::numeric_limits<genFIType>::is_signed && std::numeric_limits<genFIType>::is_integer),
"'abs' only accept floating-point and integer scalar or vector inputs");
return x;
}
};
}//namespace detail
}//namespace glm
glm
Definition: common.hpp:20