wasm4fun_time/
ticker.rs

1// Copyright Claudio Mattera 2022.
2//
3// Distributed under the MIT License or the Apache 2.0 License at your option.
4// See the accompanying files License-MIT.txt and License-Apache-2.0.txt, or
5// online at
6// https://opensource.org/licenses/MIT
7// https://opensource.org/licenses/Apache-2.0
8
9/// A ticker to keep track of the current frame from start
10///
11/// WASM-4 console runs at 60 frames per second.
12/// This object can be used to find out what is the current frame number since
13/// the console startup, or within the current second.
14pub struct Ticker;
15
16static mut TICKER_COUNTER: u64 = 0;
17
18impl Ticker {
19    /// Update the ticker
20    ///
21    /// This function must be called at the end of each frame.
22    #[inline]
23    pub fn update(&mut self) {
24        unsafe {
25            TICKER_COUNTER += 1;
26        }
27    }
28
29    /// Get the current frame number since console startup
30    #[inline]
31    pub fn since_startup(&self) -> u64 {
32        unsafe { TICKER_COUNTER }
33    }
34
35    /// Get the current frame number within current second
36    ///
37    /// The frame number will be in range [0; 60).
38    #[inline]
39    pub fn within_second(&self) -> u8 {
40        unsafe { (TICKER_COUNTER % 60) as u8 }
41    }
42}
wasm4fun_time/ticker.rs

wasm4fun_time/
ticker.rs
