guise-ui 1.5.0

//! What a player runs: one motion, or a sequence of them.
//!
//! A closed enum rather than `Box<dyn>` — there are exactly two kinds and
//! both are cheap to clone, so dispatch costs a branch and sampling stays
//! allocation-free.

use super::{Frame, Motion, Sequence};

#[derive(Debug, Clone, PartialEq)]
pub enum Clip {
    Motion(Motion),
    Sequence(Sequence),
}

impl Default for Clip {
    fn default() -> Self {
        Clip::Motion(Motion::new())
    }
}

impl Clip {
    /// One pass, in milliseconds.
    pub fn iteration_ms(&self) -> f32 {
        match self {
            Clip::Motion(motion) => motion.iteration_ms(),
            Clip::Sequence(sequence) => sequence.iteration_ms(),
        }
    }

    /// Every pass, or `f32::INFINITY` when it never ends.
    pub fn total_ms(&self) -> f32 {
        match self {
            Clip::Motion(motion) => motion.total_ms(),
            Clip::Sequence(sequence) => sequence.total_ms(),
        }
    }

    /// Whether it runs forever — the thing a player can never wait out.
    pub fn is_endless(&self) -> bool {
        !self.total_ms().is_finite()
    }

    /// Whether every other pass runs backwards.
    pub fn alternates(&self) -> bool {
        match self {
            Clip::Motion(motion) => motion.alternate,
            Clip::Sequence(sequence) => sequence.is_alternating(),
        }
    }

    pub fn sample(&self, t: f32) -> Frame {
        let mut frame = Frame::new();
        self.sample_into(t, &mut frame);
        frame
    }

    pub fn sample_into(&self, t: f32, frame: &mut Frame) {
        match self {
            Clip::Motion(motion) => motion.sample_into(t, frame),
            Clip::Sequence(sequence) => sequence.sample_into(t, frame),
        }
    }
}

impl From<Motion> for Clip {
    fn from(motion: Motion) -> Self {
        Clip::Motion(motion)
    }
}

impl From<Sequence> for Clip {
    fn from(sequence: Sequence) -> Self {
        Clip::Sequence(sequence)
    }
}