0.9.9 API documenation
compute_common.hpp
1 #pragma once
2 
3 #include "setup.hpp"
4 #include <limits>
5 
6 namespace glm{
7 namespace detail
8 {
9  template<typename genFIType, bool /*signed*/>
10  struct compute_abs
11  {};
12 
13  template<typename genFIType>
14  struct compute_abs<genFIType, true>
15  {
16  GLM_FUNC_QUALIFIER GLM_CONSTEXPR static genFIType call(genFIType x)
17  {
18  GLM_STATIC_ASSERT(
19  std::numeric_limits<genFIType>::is_iec559 || std::numeric_limits<genFIType>::is_signed,
20  "'abs' only accept floating-point and integer scalar or vector inputs");
21 
22  return x >= genFIType(0) ? x : -x;
23  // TODO, perf comp with: *(((int *) &x) + 1) &= 0x7fffffff;
24  }
25  };
26 
27 #if GLM_COMPILER & GLM_COMPILER_CUDA
28  template<>
29  struct compute_abs<float, true>
30  {
31  GLM_FUNC_QUALIFIER GLM_CONSTEXPR static float call(float x)
32  {
33  return fabsf(x);
34  }
35  };
36 #endif
37 
38  template<typename genFIType>
39  struct compute_abs<genFIType, false>
40  {
41  GLM_FUNC_QUALIFIER GLM_CONSTEXPR static genFIType call(genFIType x)
42  {
43  GLM_STATIC_ASSERT(
44  (!std::numeric_limits<genFIType>::is_signed && std::numeric_limits<genFIType>::is_integer),
45  "'abs' only accept floating-point and integer scalar or vector inputs");
46  return x;
47  }
48  };
49 }//namespace detail
50 }//namespace glm
Definition: common.hpp:20