Fixed issue with frexp.

src/math.cpp

@@ -10,6 +10,21 @@
 
 namespace bx
 {
+	float frexp(float _a, int32_t* _outExp)
+	{
+		const uint32_t ftob     = floatToBits(_a);
+		const uint32_t masked0  = uint32_and(ftob, kFloatExponentMask);
+		const uint32_t exp0     = uint32_srl(masked0, kFloatExponentBitShift);
+
+		const uint32_t masked1  = uint32_and(ftob,   kFloatSignMask | kFloatMantissaMask);
+		const uint32_t bits     = uint32_or(masked1, UINT32_C(0x3f000000) );
+		const float    result   = bitsToFloat(bits);
+
+		*_outExp = int32_t(exp0 - 0x7e);
+
+		return result;
+	}
+
 	void mtxLookAt(float* _result, const Vec3& _eye, const Vec3& _at, const Vec3& _up, Handedness::Enum _handedness)
 	{
 		const Vec3 view = normalize(