animation animation_create(s32 duration)
{
	animation an;
	an.time = 0;
	an.started = false;
	an.duration = duration;
	an.percentage = 0.0f;
	return an;
}

float animation_update(animation* an)
{
	if (!an->started) return an->percentage;
	an->time += frame_delta*1000.0f;
	if (an->time > an->duration) an->time = an->duration;
	an->percentage = an->time/an->duration; 
	return an->percentage;
}