common/math_defs.h

   1 #ifndef AL_MATH_DEFS_H
   2 #define AL_MATH_DEFS_H
   3
   4 #include <math.h>
   5 #ifdef HAVE_FLOAT_H
   6 #include <float.h>
   7 #endif
   8
   9 #ifndef M_PI
  10 #define M_PI (3.14159265358979323846)
  11 #endif
  12
  13 #define F_PI    (3.14159265358979323846f)
  14 #define F_PI_2  (1.57079632679489661923f)
  15 #define F_TAU   (6.28318530717958647692f)
  16
  17 #ifndef FLT_EPSILON
  18 #define FLT_EPSILON (1.19209290e-07f)
  19 #endif
  20
  21 #define SQRT_2 1.41421356237309504880
  22 #define SQRT_3 1.73205080756887719318
  23
  24 #define SQRTF_2 1.41421356237309504880f
  25 #define SQRTF_3 1.73205080756887719318f
  26
  27 #ifndef HUGE_VALF
  28 static const union msvc_inf_hack {
  29     unsigned char b[4];
  30     float f;
  31 } msvc_inf_union = {{ 0x00, 0x00, 0x80, 0x7F }};
  32 #define HUGE_VALF (msvc_inf_union.f)
  33 #endif
  34
  35 #ifndef HAVE_LOG2F
  36 static inline float log2f(float f)
  37 {
  38     return logf(f) / logf(2.0f);
  39 }
  40 #endif
  41
  42 #ifndef HAVE_CBRTF
  43 static inline float cbrtf(float f)
  44 {
  45     return powf(f, 1.0f/3.0f);
  46 }
  47 #endif
  48
  49 #ifndef HAVE_COPYSIGNF
  50 static inline float copysignf(float x, float y)
  51 {
  52     union {
  53         float f;
  54         unsigned int u;
  55     } ux = { x }, uy = { y };
  56     ux.u &= 0x7fffffffu;
  57     ux.u |= (uy.u&0x80000000u);
  58     return ux.f;
  59 }
  60 #endif
  61
  62 #define DEG2RAD(x)  ((float)(x) * (float)(M_PI/180.0))
  63 #define RAD2DEG(x)  ((float)(x) * (float)(180.0/M_PI))
  64
  65 #endif /* AL_MATH_DEFS_H */