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use std::ops::Mul;
use super::time::Ticks;
#[derive(Copy, Clone, PartialEq, Debug)]
pub enum BaseEffectType {
Weak { magnitude: u16 },
Strong { magnitude: u16 },
#[doc(hidden)] __Nonexhaustive,
}
impl BaseEffectType {
fn magnitude(&self) -> u16 {
match *self {
BaseEffectType::Weak { magnitude } => magnitude,
BaseEffectType::Strong { magnitude } => magnitude,
BaseEffectType::__Nonexhaustive => unreachable!(),
}
}
}
impl Mul<f32> for BaseEffectType {
type Output = BaseEffectType;
fn mul(self, rhs: f32) -> Self::Output {
let mg = (self.magnitude() as f32 * rhs) as u16;
match self {
BaseEffectType::Weak { .. } => BaseEffectType::Weak { magnitude: mg },
BaseEffectType::Strong { .. } => BaseEffectType::Strong { magnitude: mg },
BaseEffectType::__Nonexhaustive => unreachable!(),
}
}
}
impl Default for BaseEffectType {
fn default() -> Self {
BaseEffectType::Weak { magnitude: 0 }
}
}
#[derive(Copy, Clone, PartialEq, Debug, Default)]
pub struct BaseEffect {
pub kind: BaseEffectType,
pub scheduling: Replay,
pub envelope: Envelope,
}
impl BaseEffect {
pub(super) fn magnitude_at(&self, ticks: Ticks) -> BaseEffectType {
if let Some(wrapped) = self.scheduling.wrap(ticks) {
let att =
self.scheduling.at(wrapped) * self.envelope.at(wrapped, self.scheduling.play_for);
self.kind * att
} else {
self.kind * 0.0
}
}
}
#[derive(Copy, Clone, PartialEq, Debug, Default)]
pub struct Envelope {
pub attack_length: Ticks,
pub attack_level: f32,
pub fade_length: Ticks,
pub fade_level: f32,
}
impl Envelope {
pub(super) fn at(&self, ticks: Ticks, dur: Ticks) -> f32 {
debug_assert!(self.fade_length < dur);
debug_assert!(self.attack_length + self.fade_length < dur);
if ticks < self.attack_length {
self.attack_level
+ ticks.0 as f32 * (1.0 - self.attack_level) / self.attack_length.0 as f32
} else if ticks + self.fade_length > dur {
1.0
+ (ticks + self.fade_length - dur).0 as f32 * (self.fade_level - 1.0)
/ self.fade_length.0 as f32
} else {
1.0
}
}
}
#[derive(Copy, Clone, PartialEq, Debug)]
pub struct Replay {
pub after: Ticks,
pub play_for: Ticks,
pub with_delay: Ticks,
}
impl Replay {
pub(super) fn at(&self, ticks: Ticks) -> f32 {
if ticks >= self.play_for {
0.0
} else {
1.0
}
}
pub fn dur(&self) -> Ticks {
self.play_for + self.with_delay
}
fn wrap(&self, ticks: Ticks) -> Option<Ticks> {
ticks.checked_sub(self.after).map(|t| t % self.dur())
}
}
impl Default for Replay {
fn default() -> Self {
Replay {
after: Ticks(0),
play_for: Ticks(1),
with_delay: Ticks(0),
}
}
}