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castano 2011-09-28 19:54:05 +00:00
parent d87b7edd5f
commit f0d9497e1f
1 changed files with 23 additions and 0 deletions
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23
src/nvmath/nvmath.h
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@ -251,6 +251,29 @@ namespace nv
return floor(saturate(f) * scale + offset) / scale;
}*/
union Float754 {
unsigned int raw;
float value;
struct {
#if NV_BIG_ENDIAN
unsigned int negative:1;
unsigned int biasedexponent:8;
unsigned int mantissa:23;
#else
unsigned int mantissa:23;
unsigned int biasedexponent:8;
unsigned int negative:1;
#endif
} field;
};
// Return the exponent of x ~ Floor(Log2(x))
inline int floatExponent(float x)
{
Float754 f;
f.value = x;
return (f.field.biasedexponent - 127);
}
} // nv
#endif // NV_MATH_H