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Moved femtos to its own repository

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transistor 2024-02-24 15:03:31 -08:00
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.gitmodules vendored Normal file
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[submodule "emulator/libraries/femtos"]
path = emulator/libraries/femtos
url = git@github.com:transistorfet/femtos.git

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README.md
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@ -24,6 +24,11 @@ of doc comments in the code yet but I plan to eventually write more:
[rustdocs for moa_core](http://jabberwocky.ca/moa/doc/moa_core/)
[rustdocs for ym2612](http://jabberwocky.ca/moa/doc/moa_peripherals_yamaha/ym2612/index.html)
This repository uses submodules, so make sure to clone with
```sh
git clone --recurse-submodules git@github.com:transistorfet/moa.git
```
Sega Genesis/MegaDrive
----------------------

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emulator/libraries/femtos Submodule

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Subproject commit 49ae560767057adb58113bfefafadda716262695

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emulator/libraries/femtos/Cargo.toml
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[package]
name = "femtos"
version = "0.1.0"
edition = "2021"
rust-version = "1.60"
categories = ["no-std", "emulation", "simulation"]
keywords = ["femtoseconds", "time", "emulation", "simulation"]
description = "a femtosecond-based representation of time, duration, and frequency, for the purpose of simulation"
authors = ["transistor fet <trans@jabberwocky.ca>"]
license = "MIT OR Apache-2.0"
repository = "https://github.com/transistorfet/moa"
[dependencies]

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emulator/libraries/femtos/LICENSE-APACHE
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Copyright (c) 2024 transistor fet
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emulator/libraries/femtos/README.md
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[![crates.io](https://img.shields.io/crates/v/femtos.svg)](https://crates.io/crates/femtos)
[![Documentation](https://docs.rs/femtos/badge.svg)](https://docs.rs/femtos)
![Minimum Supported Rust Version](https://img.shields.io/badge/rustc-1.60+-blue.svg)
# `femtos`
> A femtosecond representation of time, duration, and frequency

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emulator/libraries/femtos/src/lib.rs
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#![doc = include_str!("../README.md")]
#![warn(missing_docs)]
#![no_std]
use core::time;
use core::ops::{Add, AddAssign, Sub, SubAssign, Mul, MulAssign, Div, DivAssign};
/// Type to use for storing femtoseconds
///
/// In webassembly, using u128 results in exceedingly slow runtimes, so we use u64 instead
/// which is enough for 5 hours of simulation time.
#[cfg(not(target_arch = "wasm32"))]
type Femtos = u128;
#[cfg(target_arch = "wasm32")]
type Femtos = u64;
/// Represents a duration of time in femtoseconds
///
/// The `Duration` type is used to represent lengths of time and is
/// intentionally similar to `std::time::Duration`, but which records
/// time as femtoseconds to keep accurancy when dealing with partial
/// nanosecond clock divisons.
#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord)]
pub struct Duration {
femtos: Femtos,
}
impl Duration {
/// A duration of zero (0) time
pub const ZERO: Self = Self::from_femtos(0);
/// A duration of the maximum possible length in femtoseconds (`Femtos::MAX`)
///
/// This will be equivalent to either u64::MAX or u128::MAX femtoseconds
pub const MAX: Self = Self::from_femtos(Femtos::MAX);
/// The number of femtoseconds in 1 second as `Femtos`
pub const FEMTOS_PER_SEC: Femtos = 1_000_000_000_000_000;
/// The number of femtoseconds in 1 millisecond as `Femtos`
pub const FEMTOS_PER_MILLISEC: Femtos = 1_000_000_000_000;
/// The number of femtoseconds in 1 microsecond as `Femtos`
pub const FEMTOS_PER_MICROSEC: Femtos = 1_000_000_000;
/// The number of femtoseconds in 1 nanosecond as `Femtos`
pub const FEMTOS_PER_NANOSEC: Femtos = 1_000_000;
/// The number of femtoseconds in 1 picosecond as `Femtos`
pub const FEMTOS_PER_PICOSEC: Femtos = 1_000;
/// Creates a new `Duration` from the specified number of seconds
///
/// # Examples
///
/// ```
/// use femtos::Duration;
///
/// let duration = Duration::from_secs(123);
///
/// assert_eq!(123, duration.as_secs());
/// ```
#[inline]
pub const fn from_secs(secs: u64) -> Self {
Self {
femtos: secs as Femtos * Self::FEMTOS_PER_SEC,
}
}
/// Creates a new `Duration` from the specified number of milliseconds
///
/// # Examples
///
/// ```
/// use femtos::Duration;
///
/// let duration = Duration::from_millis(123);
///
/// assert_eq!(123, duration.as_millis());
/// ```
#[inline]
pub const fn from_millis(millisecs: u64) -> Self {
Self {
femtos: millisecs as Femtos * Self::FEMTOS_PER_MILLISEC,
}
}
/// Creates a new `Duration` from the specified number of microseconds
///
/// # Examples
///
/// ```
/// use femtos::Duration;
///
/// let duration = Duration::from_micros(123);
///
/// assert_eq!(123, duration.as_micros());
/// ```
#[inline]
pub const fn from_micros(microsecs: u64) -> Self {
Self {
femtos: microsecs as Femtos * Self::FEMTOS_PER_MICROSEC,
}
}
/// Creates a new `Duration` from the specified number of nanoseconds
///
/// # Examples
///
/// ```
/// use femtos::Duration;
///
/// let duration = Duration::from_nanos(123);
///
/// assert_eq!(123, duration.as_nanos());
/// ```
#[inline]
pub const fn from_nanos(nanosecs: u64) -> Self {
Self {
femtos: nanosecs as Femtos * Self::FEMTOS_PER_NANOSEC,
}
}
/// Creates a new `Duration` from the specified number of picoseconds
///
/// # Examples
///
/// ```
/// use femtos::Duration;
///
/// let duration = Duration::from_picos(123);
///
/// assert_eq!(123, duration.as_picos());
/// ```
#[inline]
pub const fn from_picos(picosecs: u128) -> Self {
Self {
femtos: picosecs as Femtos * Self::FEMTOS_PER_PICOSEC,
}
}
/// Creates a new `Duration` from the specified number of femtoseconds
///
/// # Examples
///
/// ```
/// use femtos::Duration;
///
/// let duration = Duration::from_femtos(123);
///
/// assert_eq!(123, duration.as_femtos());
/// ```
#[inline]
pub const fn from_femtos(femtos: Femtos) -> Self {
Self {
femtos,
}
}
/// Returns the number of _whole_ seconds contained by this `Duration`.
///
/// # Examples
///
/// ```
/// use femtos::Duration;
///
/// let duration = Duration::from_femtos(123_465_789_012_345_678);
/// assert_eq!(duration.as_secs(), 123);
/// ```
#[inline]
pub const fn as_secs(self) -> u64 {
(self.femtos / Self::FEMTOS_PER_SEC) as u64
}
/// Returns the number of _whole_ milliseconds contained by this `Duration`.
///
/// # Examples
///
/// ```
/// use femtos::Duration;
///
/// let duration = Duration::from_femtos(123_465_789_012_345_678);
/// assert_eq!(duration.as_millis(), 123_465);
/// ```
#[inline]
pub const fn as_millis(self) -> u64 {
(self.femtos / Self::FEMTOS_PER_MILLISEC) as u64
}
/// Returns the number of _whole_ microseconds contained by this `Duration`.
///
/// # Examples
///
/// ```
/// use femtos::Duration;
///
/// let duration = Duration::from_femtos(123_465_789_012_345_678);
/// assert_eq!(duration.as_micros(), 123_465_789);
/// ```
#[inline]
pub const fn as_micros(self) -> u64 {
(self.femtos / Self::FEMTOS_PER_MICROSEC) as u64
}
/// Returns the number of _whole_ nanoseconds contained by this `Duration`.
///
/// # Examples
///
/// ```
/// use femtos::Duration;
///
/// let duration = Duration::from_femtos(123_465_789_012_345_678);
/// assert_eq!(duration.as_nanos(), 123_465_789_012);
/// ```
#[inline]
pub const fn as_nanos(self) -> u64 {
(self.femtos / Self::FEMTOS_PER_NANOSEC) as u64
}
/// Returns the number of _whole_ picoseconds contained by this `Duration`.
///
/// # Examples
///
/// ```
/// use femtos::Duration;
///
/// let duration = Duration::from_femtos(123_465_789_012_345_678);
/// assert_eq!(duration.as_picos(), 123_465_789_012_345);
/// ```
#[inline]
#[allow(clippy::unnecessary_cast)]
pub const fn as_picos(self) -> u128 {
(self.femtos / Self::FEMTOS_PER_PICOSEC) as u128
}
/// Returns the number of _whole_ femtoseconds contained by this `Duration`.
///
/// # Examples
///
/// ```
/// use femtos::Duration;
///
/// let duration = Duration::from_femtos(123_465_789_012_345_678);
/// assert_eq!(duration.as_femtos(), 123_465_789_012_345_678);
/// ```
#[inline]
pub const fn as_femtos(self) -> Femtos {
self.femtos
}
/// Checked `Duration` addition. Computes `self + rhs`, returning [`None`]
/// if an overflow occured.
///
/// # Examples
///
/// ```
/// use femtos::Duration;
///
/// assert_eq!(Duration::from_secs(1).checked_add(Duration::from_secs(1)), Some(Duration::from_secs(2)))
/// assert_eq!(Duration::from_secs(1).checked_add(Duration::from_femtos(Femtos::MAX)), None)
/// ```
#[inline]
pub const fn checked_add(self, rhs: Self) -> Option<Self> {
match self.femtos.checked_add(rhs.femtos) {
Some(femtos) => Some(Self::from_femtos(femtos)),
None => None,
}
}
/// Checked `Duration` subtraction. Computes `self - rhs`, returning [`None`]
/// if an overflow occured.
///
/// # Examples
///
/// ```
/// use femtos::Duration;
///
/// assert_eq!(Duration::from_secs(1).checked_sub(Duration::from_secs(1)), Some(Duration::ZERO))
/// assert_eq!(Duration::from_secs(1).checked_sub(Duration::from_femtos(2), None)
/// ```
#[inline]
pub const fn checked_sub(self, rhs: Self) -> Option<Self> {
match self.femtos.checked_sub(rhs.femtos) {
Some(femtos) => Some(Self::from_femtos(femtos)),
None => None,
}
}
}
impl Add for Duration {
type Output = Self;
fn add(self, rhs: Self) -> Self::Output {
self.checked_add(rhs).expect("clock duration overflow during addition")
}
}
impl AddAssign for Duration {
fn add_assign(&mut self, rhs: Self) {
*self = *self + rhs;
}
}
impl Sub for Duration {
type Output = Self;
fn sub(self, rhs: Self) -> Self::Output {
self.checked_sub(rhs).expect("clock duration overflow during subtraction")
}
}
impl SubAssign for Duration {
fn sub_assign(&mut self, rhs: Self) {
*self = *self - rhs;
}
}
impl Mul<u64> for Duration {
type Output = Self;
fn mul(self, rhs: u64) -> Self::Output {
Self::from_femtos(self.femtos * rhs as Femtos)
}
}
impl MulAssign<u64> for Duration {
fn mul_assign(&mut self, rhs: u64) {
*self = Self::from_femtos(self.femtos * rhs as Femtos);
}
}
impl Div<u64> for Duration {
type Output = Self;
fn div(self, rhs: u64) -> Self::Output {
Self::from_femtos(self.femtos / rhs as Femtos)
}
}
impl DivAssign<u64> for Duration {
fn div_assign(&mut self, rhs: u64) {
*self = Self::from_femtos(self.femtos / rhs as Femtos);
}
}
impl Div<Duration> for Duration {
type Output = u64;
fn div(self, rhs: Duration) -> Self::Output {
(self.femtos / rhs.femtos) as u64
}
}
impl From<Duration> for time::Duration {
fn from(value: Duration) -> Self {
time::Duration::from_nanos(value.as_nanos())
}
}
impl From<time::Duration> for Duration {
fn from(value: time::Duration) -> Self {
Duration::from_nanos(value.as_nanos() as u64)
}
}
/// Represents time from the start of the simulation
///
/// `Instant` is for representing the current running clock. It uses a
/// duration to represent the time from simulation start, and is monotonic.
#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord)]
pub struct Instant(Duration);
impl Instant {
/// An `Instant` representing the start of time (t = 0)
pub const START: Self = Self(Duration::ZERO);
/// An `Instant` representing the greatest possible time (t = `Femtos::MAX`)
pub const FOREVER: Self = Self(Duration::MAX);
/// Returns a `Duration` equivalent to the amount of time elapsed since the earliest
/// possible time (t = 0).
#[inline]
pub const fn as_duration(self) -> Duration {
self.0
}
/// Returns the `Duration` that has elapsed between this `Instant` and `other`.
///
/// # Examples
///
/// ```
/// use femtos::{Instant, Duration};
///
/// let now = Instant::START + Duration::from_secs(1);
/// assert_eq!(now.duration_since(Instant::START), Duration::from_secs(1));
/// ```
#[inline]
pub fn duration_since(self, other: Self) -> Duration {
self.0 - other.0
}
/// Checked `Instant` addition. Computes `self + duration`, returning [`None`]
/// if an overflow occured.
///
/// # Examples
///
/// ```
/// use femtos::Instant;
///
/// assert_eq!(Instant::START.checked_add(Duration::from_secs(1)).as_duration(), Some(Duration::from_secs(1)))
/// assert_eq!(Instant::START.checked_add(Duration::from_femtos(Femtos::MAX)).as_duration(), None)
/// ```
#[inline]
pub const fn checked_add(self, duration: Duration) -> Option<Self> {
match self.0.checked_add(duration) {
Some(duration) => Some(Self(duration)),
None => None,
}
}
/// Checked `Instant` subtraction. Computes `self - duration`, returning [`None`]
/// if an overflow occured.
///
/// # Examples
///
/// ```
/// use femtos::Instant;
///
/// assert_eq!(Instant::FOREVER.checked_sub(Duration::from_secs(1)).as_duration(), Some(Duration::from_femtos(Femtos::MAX - 1)))
/// assert_eq!(Instant::START.checked_sub(Duration::from_secs(1)).as_duration(), None)
/// ```
#[inline]
pub const fn checked_sub(self, duration: Duration) -> Option<Self> {
match self.0.checked_sub(duration) {
Some(duration) => Some(Self(duration)),
None => None,
}
}
}
impl Add<Duration> for Instant {
type Output = Self;
fn add(self, rhs: Duration) -> Self::Output {
Self(self.0.add(rhs))
}
}
impl AddAssign<Duration> for Instant {
fn add_assign(&mut self, rhs: Duration) {
*self = Self(self.0.add(rhs));
}
}
/// Represents a frequency in Hz
///
/// Clocks are usually given as a frequency, but durations are needed when dealing with clocks
/// and clock durations. This type makes it easier to create a clock of a given frequency and
/// convert it to a `Duration`
#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord)]
pub struct Frequency {
hertz: u32,
}
impl Frequency {
/// Creates a new `Frequency` from the specified number of hertz
///
/// # Examples
///
/// ```
/// use femtos::Frequency;
///
/// Frequency::from_hz(123);
/// ```
#[inline]
pub const fn from_hz(hertz: u32) -> Self {
Self {
hertz,
}
}
/// Creates a new `Frequency` from the specified number of kilohertz
///
/// # Examples
///
/// ```
/// use femtos::Frequency;
///
/// Frequency::from_khz(123);
/// ```
#[inline]
pub const fn from_khz(khz: u32) -> Self {
Self {
hertz: khz * 1_000,
}
}
/// Creates a new `Frequency` from the specified number of megahertz
///
/// # Examples
///
/// ```
/// use femtos::Frequency;
///
/// Frequency::from_mhz(123);
/// ```
#[inline]
pub const fn from_mhz(mhz: u32) -> Self {
Self {
hertz: mhz * 1_000_000,
}
}
/// Returns the frequency is hertz
#[inline]
pub const fn as_hz(self) -> u32 {
self.hertz
}
/// Returns the frequency is kilohertz
#[inline]
pub const fn as_khz(self) -> u32 {
self.hertz / 1_000
}
/// Returns the frequency is megahertz
#[inline]
pub const fn as_mhz(self) -> u32 {
self.hertz / 1_000_000
}
/// Returns the `Duration` equivalent to the time period between cycles of
/// the given `Frequency`
///
/// # Examples
///
/// ```
/// use femtos::Frequency;
///
/// assert_eq!(Frequency::from_hz(1).period_duration(), Duration::from_secs(1));
/// ```
#[inline]
pub const fn period_duration(self) -> Duration {
Duration::from_femtos(Duration::FEMTOS_PER_SEC / self.hertz as Femtos)
}
}
impl Mul<u32> for Frequency {
type Output = Self;
fn mul(self, rhs: u32) -> Self::Output {
Self::from_hz(self.hertz * rhs)
}
}
impl MulAssign<u32> for Frequency {
fn mul_assign(&mut self, rhs: u32) {
*self = Self::from_hz(self.hertz * rhs);
}
}
impl Div<u32> for Frequency {
type Output = Self;
fn div(self, rhs: u32) -> Self::Output {
Self::from_hz(self.hertz / rhs)
}
}
impl DivAssign<u32> for Frequency {
fn div_assign(&mut self, rhs: u32) {
*self = Self::from_hz(self.hertz / rhs);
}
}