assimp/code/qnan.h

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#if (!defined AI_QNAN_H_INCLUDED)
#define AI_QNAN_H_INCLUDED
// Data structure for a 32 Bit IEEE 754 floating-point number
union _IEEESingle
{
float Float;
struct
{
uint32_t Frac : 23;
uint32_t Exp : 8;
uint32_t Sign : 1;
} IEEE;
} ;
// ---------------------------------------------------------------------------
// check whether a float is NaN
AI_FORCE_INLINE bool is_qnan(float in)
{
return (in != in);
}
// ---------------------------------------------------------------------------
// check whether a float is NOT NaN.
AI_FORCE_INLINE bool is_not_qnan(float in)
{
return (in == in);
}
// ---------------------------------------------------------------------------
// check whether a float is either NaN or (+/-) INF. Denorms return false,
// they're treated like normal values.
AI_FORCE_INLINE bool is_special_float(float in)
{
return (((_IEEESingle*)&in)->IEEE.Exp == (1u << 8)-1);
}
#endif // !! AI_QNAN_H_INCLUDED