From 88c94bf3031feb7f9bad4008cd403bd0b2f42db5 Mon Sep 17 00:00:00 2001
From: Jan Van Bruggen <JanCVanB@pm.me>
Date: Sat, 29 Jan 2022 18:57:43 -0700
Subject: [PATCH] Help: Why is this WIP Bevy platform failing?
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

This seems related to https://github.com/rust-lang/rust/issues/91372 .

Without `resolver = "2"`:

```
[nix-shell:~/code/clones/roc]$ cargo run examples/hello-rust/Hello.roc
    Finished dev [unoptimized + debuginfo] target(s) in 0.28s
     Running `target/debug/roc examples/hello-rust/Hello.roc`
thread '<unnamed>' panicked at 'Failed to rebuild src/lib.rs - stderr of the `cargo build` command was:
    Updating crates.io index
   Compiling libc v0.2.116
   Compiling cfg-if v1.0.0
   Compiling proc-macro2 v1.0.36
   ...
   Compiling gilrs v0.8.2
   Compiling gltf-json v0.16.0
   Compiling wgpu-hal v0.12.4
error: DX12 API enabled on non-Windows OS. If your project is not using resolver="2" in Cargo.toml, it should.
  --> /Users/jan/.cargo/registry/src/github.com-1ecc6299db9ec823/wgpu-hal-0.12.4/src/lib.rs:53:1
   |
53 | compile_error!("DX12 API enabled on non-Windows OS. If your project is not using resolver=\"2\" in Cargo.toml, it should.");
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error[E0432]: unresolved import `super::dx12`
  --> /Users/jan/.cargo/registry/src/github.com-1ecc6299db9ec823/wgpu-hal-0.12.4/src/lib.rs:68:20
   |
68 |     pub use super::dx12::Api as Dx12;
   |                    ^^^^ could not find `dx12` in the crate root

   Compiling hexasphere v6.0.0
   Compiling bevy_macro_utils v0.6.0
For more information about this error, try `rustc --explain E0432`.
error: could not compile `wgpu-hal` due to 2 previous errors
warning: build failed, waiting for other jobs to finish...
error: build failed
', compiler/build/src/link.rs:984:27
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Any { .. }', cli/src/build.rs:235:50
🔨 Rebuilding host...
[nix-shell:~/code/clones/roc]$
```

With `resolver = "2"`:

```
[nix-shell:~/code/clones/roc]$ cargo run examples/hello-rust/Hello.roc
    Finished dev [unoptimized + debuginfo] target(s) in 0.86s
     Running `target/debug/roc examples/hello-rust/Hello.roc`
🔨 Rebuilding host... Done!
Undefined symbols for architecture x86_64:
  "_AudioComponentFindNext", referenced from:
      __ZN9coreaudio10audio_unit9AudioUnit14new_with_flags17heb6ec65f112e010bE in host.o
  "_AudioComponentInstanceDispose", referenced from:
      __ZN74_$LT$coreaudio..audio_unit..AudioUnit$u20$as$u20$core..ops..drop..Drop$GT$4drop17h75c103dc6ced4686E in host.o
  "_AudioComponentInstanceNew", referenced from:
      __ZN9coreaudio10audio_unit9AudioUnit14new_with_flags17heb6ec65f112e010bE in host.o
  "_AudioObjectGetPropertyData", referenced from:
      __ZN4cpal4host9coreaudio5macos9enumerate13audio_devices17haf753430364e01ffE in host.o
      __ZN4cpal4host9coreaudio5macos9enumerate20default_input_device17h2d1534837211f2f8E in host.o
      __ZN4cpal4host9coreaudio5macos9enumerate21default_output_device17h083911c236280accE in host.o
      __ZN4cpal4host9coreaudio5macos6Device4name17h68e2f994f5671fa5E in host.o
      __ZN4cpal4host9coreaudio5macos6Device17supported_configs17h11dc942236696a63E in host.o
      __ZN4cpal4host9coreaudio5macos6Device14default_config17hdbd3efef31ad18f9E in host.o
      __ZN4cpal4host9coreaudio5macos6Device22build_input_stream_raw13rate_listener17h0d393e1cb81ceb75E in host.o
      ...
  "_AudioObjectGetPropertyDataSize", referenced from:
      __ZN4cpal4host9coreaudio5macos9enumerate13audio_devices17haf753430364e01ffE in host.o
      __ZN4cpal4host9coreaudio5macos6Device17supported_configs17h11dc942236696a63E in host.o
  "_AudioOutputUnitStart", referenced from:
      __ZN9coreaudio10audio_unit9AudioUnit5start17h3f1dd3512794e2c6E in host.o
  "_AudioOutputUnitStop", referenced from:
      __ZN9coreaudio10audio_unit9AudioUnit4stop17h8195cacdfa008254E in host.o
  "_AudioUnitGetProperty", referenced from:
      __ZN9coreaudio10audio_unit12get_property17hcf8e3ea3616b46c8E in host.o
      __ZN9coreaudio10audio_unit12get_property17h521e60fcc0df83d1E in host.o
      __ZN9coreaudio10audio_unit12get_property17hbd4c129c859bc308E in host.o
  "_AudioUnitInitialize", referenced from:
      __ZN9coreaudio10audio_unit9AudioUnit14new_with_flags17heb6ec65f112e010bE in host.o
      __ZN9coreaudio10audio_unit9AudioUnit10initialize17hb6a2c15df5611a8bE in host.o
  "_AudioUnitSetProperty", referenced from:
      __ZN9coreaudio10audio_unit12set_property17h7ac04f580fde2d6bE in host.o
      __ZN9coreaudio10audio_unit12set_property17h7fe7a189aa012be8E in host.o
      __ZN9coreaudio10audio_unit12set_property17h4c55c6b1a7e57f73E in host.o
      __ZN9coreaudio10audio_unit12set_property17he956119f0b29327cE in host.o
  "_AudioUnitUninitialize", referenced from:
      __ZN9coreaudio10audio_unit9AudioUnit12uninitialize17h3386111a26093dcbE in host.o
      __ZN74_$LT$coreaudio..audio_unit..AudioUnit$u20$as$u20$core..ops..drop..Drop$GT$4drop17h75c103dc6ced4686E in host.o
  "_CFStringGetCString", referenced from:
      __ZN4cpal4host9coreaudio5macos6Device4name17h68e2f994f5671fa5E in host.o
  "_CFStringGetCStringPtr", referenced from:
      __ZN4cpal4host9coreaudio5macos6Device4name17h68e2f994f5671fa5E in host.o
ld: symbol(s) not found for architecture x86_64

[nix-shell:~/code/clones/roc]$
```
---
 examples/hello-rust/platform/Cargo.lock | 3150 ++++++++++++++++++++++-
 examples/hello-rust/platform/Cargo.toml |    4 +
 examples/hello-rust/platform/src/lib.rs |  328 +++
 3 files changed, 3476 insertions(+), 6 deletions(-)

diff --git a/examples/hello-rust/platform/Cargo.lock b/examples/hello-rust/platform/Cargo.lock
index b113b7e1cda..37a12547cb1 100644
--- a/examples/hello-rust/platform/Cargo.lock
+++ b/examples/hello-rust/platform/Cargo.lock
@@ -2,20 +2,3158 @@
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+checksum = "2eb6ec270a31b1d3c7e266b999739109abce8b6c87e4b31fcfcd788b65267395"
+dependencies = [
+ "cfg-if 1.0.0",
+ "js-sys",
+ "wasm-bindgen",
+ "web-sys",
+]
+
+[[package]]
+name = "wasm-bindgen-macro"
+version = "0.2.79"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2f4203d69e40a52ee523b2529a773d5ffc1dc0071801c87b3d270b471b80ed01"
+dependencies = [
+ "quote",
+ "wasm-bindgen-macro-support",
+]
+
+[[package]]
+name = "wasm-bindgen-macro-support"
+version = "0.2.79"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bfa8a30d46208db204854cadbb5d4baf5fcf8071ba5bf48190c3e59937962ebc"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+ "wasm-bindgen-backend",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-shared"
+version = "0.2.79"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3d958d035c4438e28c70e4321a2911302f10135ce78a9c7834c0cab4123d06a2"
+
+[[package]]
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+checksum = "c060b319f29dd25724f09a2ba1418f142f539b2be99fbf4d2d5a8f7330afb8eb"
+dependencies = [
+ "js-sys",
+ "wasm-bindgen",
+]
+
+[[package]]
+name = "wgpu"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b97cd781ff044d6d697b632a2e212032c2e957d1afaa21dbf58069cbb8f78567"
+dependencies = [
+ "arrayvec",
+ "js-sys",
+ "log",
+ "naga",
+ "parking_lot",
+ "raw-window-handle",
+ "smallvec",
+ "wasm-bindgen",
+ "wasm-bindgen-futures",
+ "web-sys",
+ "wgpu-core",
+ "wgpu-hal",
+ "wgpu-types",
+]
+
+[[package]]
+name = "wgpu-core"
+version = "0.12.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c4688c000eb841ca55f7b35db659b78d6e1cd77d7caf8fb929f4e181f754047d"
+dependencies = [
+ "arrayvec",
+ "bitflags",
+ "cfg_aliases",
+ "codespan-reporting",
+ "copyless",
+ "fxhash",
+ "log",
+ "naga",
+ "parking_lot",
+ "profiling",
+ "raw-window-handle",
+ "smallvec",
+ "thiserror",
+ "wgpu-hal",
+ "wgpu-types",
+]
+
+[[package]]
+name = "wgpu-hal"
+version = "0.12.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "93b1a9400e8d7f32dd4dd909bb9a391015d70633d639775ddd3f14d1104bc970"
+dependencies = [
+ "arrayvec",
+ "ash",
+ "bit-set",
+ "bitflags",
+ "block",
+ "core-graphics-types",
+ "d3d12",
+ "foreign-types",
+ "fxhash",
+ "glow",
+ "gpu-alloc",
+ "gpu-descriptor",
+ "inplace_it",
+ "js-sys",
+ "khronos-egl",
+ "libloading",
+ "log",
+ "metal",
+ "naga",
+ "objc",
+ "parking_lot",
+ "profiling",
+ "range-alloc",
+ "raw-window-handle",
+ "renderdoc-sys",
+ "thiserror",
+ "wasm-bindgen",
+ "web-sys",
+ "wgpu-types",
+ "winapi",
+]
+
+[[package]]
+name = "wgpu-types"
+version = "0.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "549533d9e1cdd4b4cda7718d33ff500fc4c34b5467b71d76b547ae0324f3b2a2"
+dependencies = [
+ "bitflags",
+]
+
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-util"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
+dependencies = [
+ "winapi",
+]
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
+[[package]]
+name = "winit"
+version = "0.26.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9b43cc931d58b99461188607efd7acb2a093e65fc621f54cad78517a6063e73a"
+dependencies = [
+ "bitflags",
+ "cocoa",
+ "core-foundation 0.9.2",
+ "core-graphics 0.22.3",
+ "core-video-sys",
+ "dispatch",
+ "instant",
+ "lazy_static",
  "libc",
- "roc_std",
+ "log",
+ "mio 0.8.0",
+ "ndk 0.5.0",
+ "ndk-glue 0.5.0",
+ "ndk-sys 0.2.2",
+ "objc",
+ "parking_lot",
+ "percent-encoding",
+ "raw-window-handle",
+ "wasm-bindgen",
+ "web-sys",
+ "winapi",
+ "x11-dl",
 ]
 
 [[package]]
-name = "libc"
-version = "0.2.92"
+name = "x11-dl"
+version = "2.19.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "56d855069fafbb9b344c0f962150cd2c1187975cb1c22c1522c240d8c4986714"
+checksum = "ea26926b4ce81a6f5d9d0f3a0bc401e5a37c6ae14a1bfaa8ff6099ca80038c59"
+dependencies = [
+ "lazy_static",
+ "libc",
+ "pkg-config",
+]
 
 [[package]]
-name = "roc_std"
-version = "0.1.0"
+name = "xi-unicode"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a67300977d3dc3f8034dae89778f502b6ba20b269527b3223ba59c0cf393bb8a"
diff --git a/examples/hello-rust/platform/Cargo.toml b/examples/hello-rust/platform/Cargo.toml
index 72f534c88eb..4ff6129cec9 100644
--- a/examples/hello-rust/platform/Cargo.toml
+++ b/examples/hello-rust/platform/Cargo.toml
@@ -5,11 +5,13 @@ authors = ["The Roc Contributors"]
 license = "UPL-1.0"
 edition = "2018"
 links = "app"
+resolver = "2"
 
 [lib]
 name = "host"
 path = "src/lib.rs"
 crate-type = ["staticlib", "rlib"]
+# crate-type = ["staticlib"]
 
 [[bin]]
 name = "host"
@@ -18,5 +20,7 @@ path = "src/main.rs"
 [dependencies]
 roc_std = { path = "../../../roc_std" }
 libc = "0.2"
+bevy = { version = "0.6.0" }
+# bevy = { version = "0.6.0", features = ["dynamic"] }
 
 [workspace]
diff --git a/examples/hello-rust/platform/src/lib.rs b/examples/hello-rust/platform/src/lib.rs
index 6b054aa5514..bceaf14ed1e 100644
--- a/examples/hello-rust/platform/src/lib.rs
+++ b/examples/hello-rust/platform/src/lib.rs
@@ -4,6 +4,14 @@ use core::ffi::c_void;
 use roc_std::RocStr;
 use std::ffi::CStr;
 use std::os::raw::c_char;
+//// [JanCVanB] From the simple Bevy example: https://github.com/bevyengine/bevy/blob/main/examples/hello_world.rs
+use bevy::prelude::*;
+// //// [JanCVanB] From the advanced Bevy example: https://github.com/bevyengine/bevy/blob/main/examples/game/breakout.rs
+// use bevy::{
+//     core::FixedTimestep,
+//     prelude::*,
+//     sprite::collide_aabb::{collide, Collision},
+// };
 
 extern "C" {
     #[link_name = "roc__mainForHost_1_exposed"]
@@ -55,6 +63,7 @@ pub unsafe extern "C" fn roc_memset(dst: *mut c_void, c: i32, n: usize) -> *mut
 
 #[no_mangle]
 pub extern "C" fn rust_main() -> i32 {
+    bevy_main();
     unsafe {
         let roc_str = roc_main();
 
@@ -69,3 +78,322 @@ pub extern "C" fn rust_main() -> i32 {
     // Exit code
     0
 }
+
+//// [JanCVanB] From the simple Bevy example: https://github.com/bevyengine/bevy/blob/main/examples/hello_world.rs
+
+// [JanCVanB] Renamed for clarity
+fn bevy_main() {
+    App::new().add_system(hello_world_system).run();
+}
+
+fn hello_world_system() {
+    println!("hello world");
+}
+
+// //// [JanCVanB] From the advanced Bevy example: https://github.com/bevyengine/bevy/blob/main/examples/game/breakout.rs
+
+// /// An implementation of the classic game "Breakout"
+// const TIME_STEP: f32 = 1.0 / 60.0;
+// // [JanCVanB] Renamed for clarity
+// fn bevy_main() {
+//     App::new()
+//         .add_plugins(DefaultPlugins)
+//         .insert_resource(Scoreboard { score: 0 })
+//         .insert_resource(ClearColor(Color::rgb(0.9, 0.9, 0.9)))
+//         .add_startup_system(setup)
+//         .add_system_set(
+//             SystemSet::new()
+//                 .with_run_criteria(FixedTimestep::step(TIME_STEP as f64))
+//                 .with_system(paddle_movement_system)
+//                 .with_system(ball_collision_system)
+//                 .with_system(ball_movement_system),
+//         )
+//         .add_system(scoreboard_system)
+//         .add_system(bevy::input::system::exit_on_esc_system)
+//         .run();
+// }
+
+// #[derive(Component)]
+// struct Paddle {
+//     speed: f32,
+// }
+
+// #[derive(Component)]
+// struct Ball {
+//     velocity: Vec3,
+// }
+
+// #[derive(Component)]
+// enum Collider {
+//     Solid,
+//     Scorable,
+//     Paddle,
+// }
+
+// struct Scoreboard {
+//     score: usize,
+// }
+
+// fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
+//     // Add the game's entities to our world
+
+//     // cameras
+//     commands.spawn_bundle(OrthographicCameraBundle::new_2d());
+//     commands.spawn_bundle(UiCameraBundle::default());
+//     // paddle
+//     commands
+//         .spawn_bundle(SpriteBundle {
+//             transform: Transform {
+//                 translation: Vec3::new(0.0, -215.0, 0.0),
+//                 scale: Vec3::new(120.0, 30.0, 0.0),
+//                 ..Default::default()
+//             },
+//             sprite: Sprite {
+//                 color: Color::rgb(0.5, 0.5, 1.0),
+//                 ..Default::default()
+//             },
+//             ..Default::default()
+//         })
+//         .insert(Paddle { speed: 500.0 })
+//         .insert(Collider::Paddle);
+//     // ball
+//     commands
+//         .spawn_bundle(SpriteBundle {
+//             transform: Transform {
+//                 scale: Vec3::new(30.0, 30.0, 0.0),
+//                 translation: Vec3::new(0.0, -50.0, 1.0),
+//                 ..Default::default()
+//             },
+//             sprite: Sprite {
+//                 color: Color::rgb(1.0, 0.5, 0.5),
+//                 ..Default::default()
+//             },
+//             ..Default::default()
+//         })
+//         .insert(Ball {
+//             velocity: 400.0 * Vec3::new(0.5, -0.5, 0.0).normalize(),
+//         });
+//     // scoreboard
+//     commands.spawn_bundle(TextBundle {
+//         text: Text {
+//             sections: vec![
+//                 TextSection {
+//                     value: "Score: ".to_string(),
+//                     style: TextStyle {
+//                         font: asset_server.load("fonts/FiraSans-Bold.ttf"),
+//                         font_size: 40.0,
+//                         color: Color::rgb(0.5, 0.5, 1.0),
+//                     },
+//                 },
+//                 TextSection {
+//                     value: "".to_string(),
+//                     style: TextStyle {
+//                         font: asset_server.load("fonts/FiraMono-Medium.ttf"),
+//                         font_size: 40.0,
+//                         color: Color::rgb(1.0, 0.5, 0.5),
+//                     },
+//                 },
+//             ],
+//             ..Default::default()
+//         },
+//         style: Style {
+//             position_type: PositionType::Absolute,
+//             position: Rect {
+//                 top: Val::Px(5.0),
+//                 left: Val::Px(5.0),
+//                 ..Default::default()
+//             },
+//             ..Default::default()
+//         },
+//         ..Default::default()
+//     });
+
+//     // Add walls
+//     let wall_color = Color::rgb(0.8, 0.8, 0.8);
+//     let wall_thickness = 10.0;
+//     let bounds = Vec2::new(900.0, 600.0);
+
+//     // left
+//     commands
+//         .spawn_bundle(SpriteBundle {
+//             transform: Transform {
+//                 translation: Vec3::new(-bounds.x / 2.0, 0.0, 0.0),
+//                 scale: Vec3::new(wall_thickness, bounds.y + wall_thickness, 1.0),
+//                 ..Default::default()
+//             },
+//             sprite: Sprite {
+//                 color: wall_color,
+//                 ..Default::default()
+//             },
+//             ..Default::default()
+//         })
+//         .insert(Collider::Solid);
+//     // right
+//     commands
+//         .spawn_bundle(SpriteBundle {
+//             transform: Transform {
+//                 translation: Vec3::new(bounds.x / 2.0, 0.0, 0.0),
+//                 scale: Vec3::new(wall_thickness, bounds.y + wall_thickness, 1.0),
+//                 ..Default::default()
+//             },
+//             sprite: Sprite {
+//                 color: wall_color,
+//                 ..Default::default()
+//             },
+//             ..Default::default()
+//         })
+//         .insert(Collider::Solid);
+//     // bottom
+//     commands
+//         .spawn_bundle(SpriteBundle {
+//             transform: Transform {
+//                 translation: Vec3::new(0.0, -bounds.y / 2.0, 0.0),
+//                 scale: Vec3::new(bounds.x + wall_thickness, wall_thickness, 1.0),
+//                 ..Default::default()
+//             },
+//             sprite: Sprite {
+//                 color: wall_color,
+//                 ..Default::default()
+//             },
+//             ..Default::default()
+//         })
+//         .insert(Collider::Solid);
+//     // top
+//     commands
+//         .spawn_bundle(SpriteBundle {
+//             transform: Transform {
+//                 translation: Vec3::new(0.0, bounds.y / 2.0, 0.0),
+//                 scale: Vec3::new(bounds.x + wall_thickness, wall_thickness, 1.0),
+//                 ..Default::default()
+//             },
+//             sprite: Sprite {
+//                 color: wall_color,
+//                 ..Default::default()
+//             },
+//             ..Default::default()
+//         })
+//         .insert(Collider::Solid);
+
+//     // Add bricks
+//     let brick_rows = 4;
+//     let brick_columns = 5;
+//     let brick_spacing = 20.0;
+//     let brick_size = Vec3::new(150.0, 30.0, 1.0);
+//     let bricks_width = brick_columns as f32 * (brick_size.x + brick_spacing) - brick_spacing;
+//     // center the bricks and move them up a bit
+//     let bricks_offset = Vec3::new(-(bricks_width - brick_size.x) / 2.0, 100.0, 0.0);
+//     let brick_color = Color::rgb(0.5, 0.5, 1.0);
+//     for row in 0..brick_rows {
+//         let y_position = row as f32 * (brick_size.y + brick_spacing);
+//         for column in 0..brick_columns {
+//             let brick_position = Vec3::new(
+//                 column as f32 * (brick_size.x + brick_spacing),
+//                 y_position,
+//                 0.0,
+//             ) + bricks_offset;
+//             // brick
+//             commands
+//                 .spawn_bundle(SpriteBundle {
+//                     sprite: Sprite {
+//                         color: brick_color,
+//                         ..Default::default()
+//                     },
+//                     transform: Transform {
+//                         translation: brick_position,
+//                         scale: brick_size,
+//                         ..Default::default()
+//                     },
+//                     ..Default::default()
+//                 })
+//                 .insert(Collider::Scorable);
+//         }
+//     }
+// }
+
+// fn paddle_movement_system(
+//     keyboard_input: Res<Input<KeyCode>>,
+//     mut query: Query<(&Paddle, &mut Transform)>,
+// ) {
+//     let (paddle, mut transform) = query.single_mut();
+//     let mut direction = 0.0;
+//     if keyboard_input.pressed(KeyCode::Left) {
+//         direction -= 1.0;
+//     }
+
+//     if keyboard_input.pressed(KeyCode::Right) {
+//         direction += 1.0;
+//     }
+
+//     let translation = &mut transform.translation;
+//     // move the paddle horizontally
+//     translation.x += direction * paddle.speed * TIME_STEP;
+//     // bound the paddle within the walls
+//     translation.x = translation.x.min(380.0).max(-380.0);
+// }
+
+// fn ball_movement_system(mut ball_query: Query<(&Ball, &mut Transform)>) {
+//     let (ball, mut transform) = ball_query.single_mut();
+//     transform.translation += ball.velocity * TIME_STEP;
+// }
+
+// fn scoreboard_system(scoreboard: Res<Scoreboard>, mut query: Query<&mut Text>) {
+//     let mut text = query.single_mut();
+//     text.sections[1].value = format!("{}", scoreboard.score);
+// }
+
+// fn ball_collision_system(
+//     mut commands: Commands,
+//     mut scoreboard: ResMut<Scoreboard>,
+//     mut ball_query: Query<(&mut Ball, &Transform)>,
+//     collider_query: Query<(Entity, &Collider, &Transform)>,
+// ) {
+//     let (mut ball, ball_transform) = ball_query.single_mut();
+//     let ball_size = ball_transform.scale.truncate();
+//     let velocity = &mut ball.velocity;
+
+//     // check collision with walls
+//     for (collider_entity, collider, transform) in collider_query.iter() {
+//         let collision = collide(
+//             ball_transform.translation,
+//             ball_size,
+//             transform.translation,
+//             transform.scale.truncate(),
+//         );
+//         if let Some(collision) = collision {
+//             // scorable colliders should be despawned and increment the scoreboard on collision
+//             if let Collider::Scorable = *collider {
+//                 scoreboard.score += 1;
+//                 commands.entity(collider_entity).despawn();
+//             }
+
+//             // reflect the ball when it collides
+//             let mut reflect_x = false;
+//             let mut reflect_y = false;
+
+//             // only reflect if the ball's velocity is going in the opposite direction of the
+//             // collision
+//             match collision {
+//                 Collision::Left => reflect_x = velocity.x > 0.0,
+//                 Collision::Right => reflect_x = velocity.x < 0.0,
+//                 Collision::Top => reflect_y = velocity.y < 0.0,
+//                 Collision::Bottom => reflect_y = velocity.y > 0.0,
+//             }
+
+//             // reflect velocity on the x-axis if we hit something on the x-axis
+//             if reflect_x {
+//                 velocity.x = -velocity.x;
+//             }
+
+//             // reflect velocity on the y-axis if we hit something on the y-axis
+//             if reflect_y {
+//                 velocity.y = -velocity.y;
+//             }
+
+//             // break if this collide is on a solid, otherwise continue check whether a solid is
+//             // also in collision
+//             if let Collider::Solid = *collider {
+//                 break;
+//             }
+//         }
+//     }
+// }