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
1
.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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[[package]]
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name = "autocfg"
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version = "1.0.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "cdb031dd78e28731d87d56cc8ffef4a8f36ca26c38fe2de700543e627f8a464a"
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[[package]]
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name = "futures"
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version = "0.3.16"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "1adc00f486adfc9ce99f77d717836f0c5aa84965eb0b4f051f4e83f7cab53f8b"
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dependencies = [
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"futures-channel",
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"futures-core",
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"futures-executor",
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"futures-io",
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"futures-sink",
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"futures-task",
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"futures-util",
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]
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[[package]]
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name = "futures-channel"
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version = "0.3.16"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "74ed2411805f6e4e3d9bc904c95d5d423b89b3b25dc0250aa74729de20629ff9"
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dependencies = [
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"futures-core",
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"futures-sink",
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]
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[[package]]
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name = "futures-core"
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version = "0.3.16"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "af51b1b4a7fdff033703db39de8802c673eb91855f2e0d47dcf3bf2c0ef01f99"
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[[package]]
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name = "futures-executor"
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version = "0.3.16"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "4d0d535a57b87e1ae31437b892713aee90cd2d7b0ee48727cd11fc72ef54761c"
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dependencies = [
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"futures-core",
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"futures-task",
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"futures-util",
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]
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[[package]]
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name = "futures-io"
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version = "0.3.16"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "0b0e06c393068f3a6ef246c75cdca793d6a46347e75286933e5e75fd2fd11582"
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[[package]]
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name = "futures-macro"
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version = "0.3.16"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "c54913bae956fb8df7f4dc6fc90362aa72e69148e3f39041fbe8742d21e0ac57"
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dependencies = [
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"autocfg",
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"proc-macro-hack",
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"proc-macro2",
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"quote",
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"syn",
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]
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[[package]]
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name = "futures-sink"
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version = "0.3.16"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "c0f30aaa67363d119812743aa5f33c201a7a66329f97d1a887022971feea4b53"
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[[package]]
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name = "futures-task"
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version = "0.3.16"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "bbe54a98670017f3be909561f6ad13e810d9a51f3f061b902062ca3da80799f2"
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[[package]]
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name = "futures-util"
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version = "0.3.16"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "67eb846bfd58e44a8481a00049e82c43e0ccb5d61f8dc071057cb19249dd4d78"
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dependencies = [
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"autocfg",
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"futures-channel",
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"futures-core",
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"futures-io",
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"futures-macro",
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"futures-sink",
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"futures-task",
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"memchr",
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"pin-project-lite",
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"pin-utils",
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"proc-macro-hack",
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"proc-macro-nested",
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"slab",
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]
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[[package]]
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name = "loopcore"
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version = "0.1.0"
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dependencies = [
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"futures",
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]
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[[package]]
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name = "memchr"
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version = "2.4.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "b16bd47d9e329435e309c58469fe0791c2d0d1ba96ec0954152a5ae2b04387dc"
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[[package]]
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name = "pin-project-lite"
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version = "0.2.7"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "8d31d11c69a6b52a174b42bdc0c30e5e11670f90788b2c471c31c1d17d449443"
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[[package]]
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name = "pin-utils"
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version = "0.1.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "8b870d8c151b6f2fb93e84a13146138f05d02ed11c7e7c54f8826aaaf7c9f184"
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[[package]]
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name = "proc-macro-hack"
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version = "0.5.19"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "dbf0c48bc1d91375ae5c3cd81e3722dff1abcf81a30960240640d223f59fe0e5"
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[[package]]
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name = "proc-macro-nested"
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version = "0.1.7"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "bc881b2c22681370c6a780e47af9840ef841837bc98118431d4e1868bd0c1086"
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[[package]]
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name = "proc-macro2"
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version = "1.0.28"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "5c7ed8b8c7b886ea3ed7dde405212185f423ab44682667c8c6dd14aa1d9f6612"
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dependencies = [
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"unicode-xid",
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]
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[[package]]
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name = "quote"
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version = "1.0.9"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "c3d0b9745dc2debf507c8422de05d7226cc1f0644216dfdfead988f9b1ab32a7"
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dependencies = [
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"proc-macro2",
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]
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[[package]]
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name = "slab"
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version = "0.4.3"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "f173ac3d1a7e3b28003f40de0b5ce7fe2710f9b9dc3fc38664cebee46b3b6527"
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[[package]]
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name = "syn"
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version = "1.0.74"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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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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version = "0.2.2"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "8ccb82d61f80a663efe1f787a51b16b5a51e3314d6ac365b08639f52387b33f3"
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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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Loading…
Reference in New Issue
Block a user