Sine implementation

sine.c

float Sine(float x) {
	if (fabs(x) > 0.0002441406)
	{
		if (fabs(x) < 0.7853982)
		{
			float sq = x * x;
			x *= ((sq * -0.0001950181 + 0.008332016) * sq + -0.16666651) * sq + 1.0;
		}
		else if (x *= 0.6366197 > 1.0737418E+09)
			x = 0;
		else
		{ 
			int qtrPeriod = (int)(x < 0 ? x - 0.5 : x + 0.5);
			//float modulo
			x -= IntToFloat(qtrPeriod);
			if (qtrPeriod & 0x1)
			{
				//crest and trough
				float sq = x * x;
				x = ((sq * -0.020398581 + 0.25359493) * sq + -1.2336967) * sq + 1.0;
				
			}
			else
			{
				//in between
				float sq = x * x;
				x *= ((sq * -0.004601656 + 0.07968003) * sq + -0.64596341) * sq + 1.5707964;
			}
			//Other side of the circle
			if (qtrPeriod & 0x2)
				x = -x;
		}
	}
	return x;
}

float IntToFloat(int arg) {
	return (float)arg;
}