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 #define F_PI    (3.14159265358979323846f)
  10 #define F_PI_2  (1.57079632679489661923f)
  11 #define F_TAU   (6.28318530717958647692f)
  12
  13 #ifndef FLT_EPSILON
  14 #define FLT_EPSILON (1.19209290e-07f)
  15 #endif
  16
  17 #ifndef HUGE_VALF
  18 static const union msvc_inf_hack {
  19     unsigned char b[4];
  20     float f;
  21 } msvc_inf_union = {{ 0x00, 0x00, 0x80, 0x7F }};
  22 #define HUGE_VALF (msvc_inf_union.f)
  23 #endif
  24
  25 #ifndef HAVE_LOG2F
  26 static inline float log2f(float f)
  27 {
  28     return logf(f) / logf(2.0f);
  29 }
  30 #endif
  31
  32 #define DEG2RAD(x)  ((float)(x) * (F_PI/180.0f))
  33 #define RAD2DEG(x)  ((float)(x) * (180.0f/F_PI))
  34
  35 #endif /* AL_MATH_DEFS_H */