tiny.rig.Playback

1pub const Playback = struct {2    /// Seconds into the clip.3    time: f64 = 0,4    speed: f32 = 1,5    loop: bool = true,6    /// Poses shown a second, or null for a new pose at every sample.7    step_rate: ?f32 = null,89    pub fn advance(playback: *Playback, seconds: f64) void {10        assert(std.math.isFinite(seconds));11        assert(std.math.isFinite(playback.speed));12        playback.time += seconds * playback.speed;13    }1415    /// The index of the pose on show, when stepping. A playhead within16    /// `time.boundary_tolerance` of a step boundary counts as on it, so a17    /// clock advanced by a rounded 1/60 each tick still turns poses on18    /// exact ticks.19    pub fn step(playback: Playback) ?i64 {20        const rate = playback.step_rate orelse return null;21        assert(std.math.isFinite(rate));22        assert(rate > 0);23        const position = time.floorSnapped(playback.time * rate);24        assert(@abs(position) < max_exact_step);25        return @intFromFloat(position);26    }2728    /// The time to sample the clip at: the playhead, or the start of its29    /// step.30    pub fn sampleTime(playback: Playback) f64 {31        const index = playback.step() orelse return playback.time;32        return @as(f64, @floatFromInt(index)) / playback.step_rate.?;33    }34};

1pub const Playback = playback.Playback;