batch operations
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0dc33e54ab
commit
568e0cb835
76
Cargo.lock
generated
76
Cargo.lock
generated
@ -8,6 +8,12 @@ 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 = "cfg-if"
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version = "1.0.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
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[[package]]
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name = "futures"
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version = "0.3.16"
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@ -102,13 +108,31 @@ dependencies = [
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"slab",
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]
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[[package]]
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name = "getrandom"
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version = "0.2.3"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "7fcd999463524c52659517fe2cea98493cfe485d10565e7b0fb07dbba7ad2753"
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dependencies = [
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"cfg-if",
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"libc",
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"wasi",
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]
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[[package]]
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name = "hypoloop"
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version = "0.1.0"
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dependencies = [
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"futures",
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"rand",
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]
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[[package]]
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name = "libc"
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version = "0.2.99"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "a7f823d141fe0a24df1e23b4af4e3c7ba9e5966ec514ea068c93024aa7deb765"
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[[package]]
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name = "memchr"
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version = "2.4.0"
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@ -127,6 +151,12 @@ 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 = "ppv-lite86"
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version = "0.2.10"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "ac74c624d6b2d21f425f752262f42188365d7b8ff1aff74c82e45136510a4857"
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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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@ -157,6 +187,46 @@ dependencies = [
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"proc-macro2",
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]
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[[package]]
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name = "rand"
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version = "0.8.4"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "2e7573632e6454cf6b99d7aac4ccca54be06da05aca2ef7423d22d27d4d4bcd8"
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dependencies = [
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"libc",
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"rand_chacha",
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"rand_core",
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"rand_hc",
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]
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[[package]]
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name = "rand_chacha"
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version = "0.3.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
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dependencies = [
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"ppv-lite86",
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"rand_core",
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]
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[[package]]
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name = "rand_core"
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version = "0.6.3"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "d34f1408f55294453790c48b2f1ebbb1c5b4b7563eb1f418bcfcfdbb06ebb4e7"
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dependencies = [
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"getrandom",
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]
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[[package]]
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name = "rand_hc"
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version = "0.3.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "d51e9f596de227fda2ea6c84607f5558e196eeaf43c986b724ba4fb8fdf497e7"
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dependencies = [
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"rand_core",
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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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@ -179,3 +249,9 @@ 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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[[package]]
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name = "wasi"
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version = "0.10.2+wasi-snapshot-preview1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "fd6fbd9a79829dd1ad0cc20627bf1ed606756a7f77edff7b66b7064f9cb327c6"
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@ -7,3 +7,4 @@ edition = "2018"
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[dependencies]
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futures = "0.3.16"
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rand = "0.8.4"
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45
src/main.rs
45
src/main.rs
@ -1,4 +1,5 @@
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use std::time::{Duration, Instant};
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use rand::Rng;
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// loop constants
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const UPDATE_INTERVAL: u32 = 40;
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@ -8,8 +9,9 @@ const DEBUG_LOOP: bool = false;
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const GRAVITY: f32 = -9.8;
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// a struct made for physics objects
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#[derive(Copy, Clone)]
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#[derive(Clone)]
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struct PhysicsObject {
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name: String,
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location: [f32; 3],
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velocity: [f32; 3],
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gravity_enabled: bool
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@ -24,27 +26,36 @@ fn main() {
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// track the delta time (the duration of the previous loop in milliseconds)
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let mut delta_time = Duration::new(0, 0);
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// create a test physics object
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let mut test_object = PhysicsObject {
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location: [0.0, 0.0, 10.0],
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velocity: [0.0, 5.0, 0.0],
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// a vector of objects to calculate physics for
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let mut objects: Vec<PhysicsObject> = vec![];
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let mut rng = rand::thread_rng();
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for i in 0..6 {
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let new_object = PhysicsObject {
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name: i.to_string(),
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location: [0.0, 0.0, 0.0],
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velocity: [rng.gen::<f32>() * 10.0, rng.gen::<f32>() * 10.0, rng.gen::<f32>() * 10.0],
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gravity_enabled: true
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};
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objects.push(new_object)
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}
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while simulate {
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// start timing the loop
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let start_time = Instant::now();
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// update
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if delta_time.as_millis() as u32 >= UPDATE_INTERVAL {
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update(delta_time, &mut test_object);
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update(delta_time, &mut objects);
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// reset the delta time
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delta_time = Duration::new(0,0);
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}
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// DEBUG
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println!("Time: {}s | test_object | Location: {:?} | Velocity: {:?}", time.as_millis() as f32 / 1000.0, test_object.location, test_object.velocity);
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for object in objects.iter() {
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println!("Time: {}s | {} | Location: {:?} | Velocity: {:?}", time.as_millis() as f32 / 1000.0, object.name, object.location, object.velocity);
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}
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//display(delta_time, &test_object);
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@ -57,7 +68,7 @@ fn main() {
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// update function
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// TODO - I think I'm resetting delta time in the wrong place or just using it incorrectly; frameskips aren't happening at all
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fn update(delta_time: Duration, object: &mut PhysicsObject) {
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fn update(delta_time: Duration, objects: &mut Vec<PhysicsObject>) {
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if DEBUG_LOOP {
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println!("Updating");
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}
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@ -65,14 +76,19 @@ fn update(delta_time: Duration, object: &mut PhysicsObject) {
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// calculate the exact timestep (fractional time in seconds) from delta time
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let timestep: f32 = delta_time.as_millis() as f32 / 1000.0;
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for object in objects.iter_mut() {
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// update location based on velocity
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for i in 0..3 {
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object.location[i] += timestep * object.velocity[i];
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// location += timestep * velocity
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// use an FMA here to halve the rounding error
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object.location[i] = timestep.mul_add(object.velocity[i], object.location[i]);
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}
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// gravity
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if object.gravity_enabled {
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object.velocity[2] += GRAVITY * timestep;
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// velocity += timestep * gravity
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// use an FMA here to halve the rounding error
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object.velocity[2] = timestep.mul_add(GRAVITY, object.velocity[2]);
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}
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// prevent the object from going below the ground plane, and kill downward velocity upon "hitting" the ground plane
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@ -80,6 +96,7 @@ fn update(delta_time: Duration, object: &mut PhysicsObject) {
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object.location[2] = 0.0;
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object.velocity[2] = object.velocity[2].max(0.0);
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}
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}
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}
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// render function
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@ -92,14 +109,6 @@ fn display(delta_time: Duration, object: &PhysicsObject) {
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println!("Displaying | Delta Time: {}ms | Relative Time: {}", delta_time.as_millis(), interpolation);
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}
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// create a "render object", which we can apply interpolation to
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let mut render_object = *object;
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// interpolate physics values for smooth rendering
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for i in 0..3 {
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render_object.location[i] += render_object.velocity[i] * interpolation;
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}
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// DEBUG
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// println!("test_object | Location: {:?} | Velocity: {:?}", render_object.location, render_object.velocity);
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}
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