Working sync version of the game loop
Main problem here is that display() is blocked by update() and the update rate will slow down if the display rate slows below the update rate
This commit is contained in:
parent
7159007154
commit
cbd45ffc92
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.gitignore
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.gitignore
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/target
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181
Cargo.lock
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181
Cargo.lock
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# This file is automatically @generated by Cargo.
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# It is not intended for manual editing.
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version = 3
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"pin-project-lite",
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"proc-macro-hack",
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"proc-macro-nested",
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"slab",
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dependencies = [
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name = "syn"
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checksum = "1873d832550d4588c3dbc20f01361ab00bfe741048f71e3fecf145a7cc18b29c"
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dependencies = [
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"proc-macro2",
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"quote",
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"unicode-xid",
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]
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[[package]]
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name = "unicode-xid"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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9
Cargo.toml
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9
Cargo.toml
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[package]
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name = "loopcore"
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version = "0.1.0"
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edition = "2018"
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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[dependencies]
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futures = "0.3.16"
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83
src/main.rs
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src/main.rs
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use std::time::Instant;
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const UPDATE_INTERVAL: u32 = 40;
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fn main() {
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// track the update delay's exponential moving average (EMA)
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let mut frame_delay_ema: f64 = 0.0;
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// track the latest delays
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let mut frame_delay: u32 = 0;
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let mut tick_delay: u32 = 0;
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loop {
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// start per-loop delay timer
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let timer = Instant::now();
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// DEBUG - track if a tick has happened on this frame
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let mut ticked: bool = false;
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// update (game logic, etc.)
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// executes every UPDATE_INTERVAL milliseconds at maximum
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if tick_delay >= UPDATE_INTERVAL {
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// perform all per-tick logic here
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update();
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// reset the tick delay
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tick_delay = 0;
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// DEBUG
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ticked = true;
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}
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// display (rendering)
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// executes as fast as possible
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{
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display();
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}
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// get the current frame delay, update the frame delay EMA and the tick delay
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frame_delay = timer.elapsed().as_millis() as u32;
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frame_delay_ema = lerp_1d(frame_delay_ema, frame_delay as f64, 0.1f64);
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tick_delay += frame_delay;
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// debug
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let frame_rate = (1000.0f64 / frame_delay_ema as f64) as u32;
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if ticked {
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println!("Frame Delay: {}ms | Frame Rate: {}Hz | Ticked!", frame_delay, frame_rate);
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} else {
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println!("Frame Delay: {}ms | Frame Rate: {}Hz", frame_delay, frame_rate);
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}
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}
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}
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// update function
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fn update() {
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waste_time(64);
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}
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// render function
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fn display() {
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waste_time(16);
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}
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// 1D linear interpolation
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fn lerp_1d(x: f64, y: f64, a: f64) -> f64 {
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x + ((y - x) * a)
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}
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// busywork function
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fn waste_time(repeat: u32) {
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const BUFFER_RESOLUTION: usize = 512;
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// create an RGBA buffer and change every pixel one-by-one
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let mut rgba_buffer = vec![[[0.0f32; 4]; BUFFER_RESOLUTION]; BUFFER_RESOLUTION];
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// change every pixel in the buffer (repeat) times
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for _n in 0..repeat {
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for u in 0..BUFFER_RESOLUTION {
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for v in 0..BUFFER_RESOLUTION {
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rgba_buffer[u][v] = [1.0f32; 4];
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}
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}
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}
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}
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