Returns the value of RepeatS attribute. RepeatS is the field that specifies how the texture wraps in the S direction. If RepeatS is TRUE (the default case), the texture map is repeated outside the [0.0, 1.0] texture coordinate range in the S direction so that it fills the shape. If RepeatS is FALSE, the texture coordinates are clamped in the S direction to lie within the [0.0, 1.0] range.