Lots of physics thinking
This commit is contained in:
JP Stringham
40
Cargo.lock
generated
40
Cargo.lock
generated
@@ -1715,9 +1715,9 @@ checksum = "8f1fe948ff07f4bd06c30984e69f5b4899c516a3ef74f34df92a2df2ab535495"
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@@ -2307,9 +2307,9 @@ checksum = "1d674e81391d1e1ab681a28d99df07927c6d4aa5b027d7da16ba32d1d21ecd99"
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"crc32fast",
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@@ -3036,9 +3036,9 @@ dependencies = [
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@@ -3947,9 +3947,9 @@ dependencies = [
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dependencies = [
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"aho-corasick",
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"memchr",
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@@ -3959,9 +3959,9 @@ dependencies = [
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[[package]]
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@@ -3970,9 +3970,9 @@ dependencies = [
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@@ -4618,9 +4618,9 @@ checksum = "5c1cb5db39152898a79168971543b1cb5020dff7fe43c8dc468b0885f5e29df5"
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@@ -5673,18 +5673,18 @@ checksum = "6df3dc4292935e51816d896edcd52aa30bc297907c26167fec31e2b0c6a32524"
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[[package]]
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dependencies = [
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"zerocopy-derive",
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]
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[[package]]
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name = "zerocopy-derive"
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dependencies = [
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"proc-macro2",
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"quote",
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@@ -5693,6 +5693,6 @@ dependencies = [
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[[package]]
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name = "zmij"
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version = "1.0.19"
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version = "1.0.20"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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@@ -219,7 +219,7 @@ fn gameloop(
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play_phys.vel *= 6;
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play_phys.vel /= 10;
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} else {
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play_phys.add_vel(dir * UNITS_TO_PX_SCALE);
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play_phys.apply_force(dir * UNITS_TO_PX_SCALE, Some(UNITS_TO_PX_SCALE * 10 / 100));
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}
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*player_sing.1 = Transform::from_xyz(
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@@ -1,26 +1,41 @@
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/// This module is intended to be used as a fixed-point physics system.
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/// The hope is that this will make deterministic physics easier,
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/// and therefore networking a bit less of a pain.
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use bevy::{
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app::{Plugin, Update},
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ecs::{component::Component, system::Query},
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math::I64Vec2,
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};
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use bevy::{math::I64Vec2, prelude::*};
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const MAX_SPEED: i64 = 400;
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const FIXED_UPDATE_INTERVAL_MS: u128 = 10; // 100 fps physics
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#[derive(Default, Debug)]
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pub struct Physics2DPlugin {}
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pub struct Physics2DPlugin;
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#[derive(Default, Debug, Resource)]
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pub struct Physics2DWorld {
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pub last_update: u128,
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}
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impl Plugin for Physics2DPlugin {
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fn build(&self, app: &mut bevy::app::App) {
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app.add_systems(Update, tick_physics);
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app.insert_resource(Physics2DWorld::default())
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.add_systems(Update, tick_physics);
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}
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}
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fn tick_physics(mut query: Query<&mut PhysicsBody2D>) {
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fn tick_physics(
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mut query: Query<&mut PhysicsBody2D>,
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mut p_world: ResMut<Physics2DWorld>,
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time: Res<Time>,
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) {
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let t = time.elapsed().as_millis();
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let delta_t = t - p_world.last_update;
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if delta_t < FIXED_UPDATE_INTERVAL_MS {
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return;
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}
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p_world.last_update = t;
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query.iter_mut().for_each(|mut pb| {
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pb.tick();
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pb.tick(delta_t as i64);
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});
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}
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@@ -31,24 +46,27 @@ pub struct PhysicsBody2D {
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}
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impl PhysicsBody2D {
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pub fn tick(&mut self) {
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self.pos += self.vel;
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pub fn tick(&mut self, delta_t: i64) {
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self.pos += self.vel * delta_t;
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}
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pub fn add_vel(&mut self, force: I64Vec2) {
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pub fn apply_force(&mut self, force: I64Vec2, term_speed: Option<i64>) {
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let mut vel = self.vel + force;
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if vel.length_squared() >= MAX_SPEED.pow(2) {
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let Some(max_speed) = term_speed else {
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return;
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};
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if vel.length_squared() >= max_speed.pow(2) {
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let l = vel.length_squared();
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let x = vel.x * vel.x;
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let y = vel.y * vel.y;
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vel.x = match vel.x {
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..0 => (x * -MAX_SPEED) / l,
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_ => (x * MAX_SPEED) / l,
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..0 => (x * -max_speed) / l,
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_ => (x * max_speed) / l,
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};
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vel.y = match vel.y {
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..0 => (y * -MAX_SPEED) / l,
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_ => (y * MAX_SPEED) / l,
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..0 => (y * -max_speed) / l,
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_ => (y * max_speed) / l,
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};
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}
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self.vel = vel;
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