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use objc2::{Encode, Encoding, RefEncode};
/// Basis function to use to interpolate curve control points (from `MTLCurveBasis`).
///
/// Availability: API_AVAILABLE(macos(14.0), ios(17.0))
#[repr(u64)]
#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash, PartialOrd, Ord)]
pub enum MTLCurveBasis {
/// B-Spline basis. Each curve segment must have 3 or 4 control
/// points. Curve segments join with C^(N - 2) continuity, where N is
/// the number of control points. The curve does not necessarily pass
/// through the control points without additional control points at the
/// beginning and end of the curve. Each curve segment can overlap
/// N-1 control points.
BSpline = 0,
/// Catmull-Rom basis. Curves represented in this basis can also be
/// easily converted to and from the Bézier basis. Each curve segment must
/// have 4 control points. Each index in the control point index buffer
/// points to the first of 4 consecutive control points in the control point
/// buffer.
///
/// The tangent at each control point is given by
/// (P_(i+1) - P_(i-1)) / 2. Therefore, the curve does not pass through the
/// first and last control point of each connected sequence of curve
/// segments. Instead, the first and last control point are used to control
/// the tangent vector at the beginning and end of the curve.
///
/// Curve segments join with C^1 continuity and the
/// curve passes through the control points. Each curve segment can overlap
/// 3 control points.
CatmullRom = 1,
/// Linear basis. The curve is made of a sequence of connected line
/// segments each with 2 control points.
Linear = 2,
/// Bezier basis
Bezier = 3,
}
unsafe impl Encode for MTLCurveBasis {
const ENCODING: Encoding = u64::ENCODING;
}
unsafe impl RefEncode for MTLCurveBasis {
const ENCODING_REF: Encoding = Encoding::Pointer(&Self::ENCODING);
}