设置

我知道你渴望开始制作游戏, 但我们需要先做少量的设置.

Rust 设置

所有Bevy应用和引擎代码都是用Rust编写的. 这意味着在我们开始之前, 我们需要搭建我们的Rust开发环境.

安装 Rust

按照Rust入门指南安装Rust

一旦完成, rustc编译器和cargo构建系统应该成功安装在你的可执行路径中.

安装系统依赖

Linux
Windows: 你可以很好的进行下去
MacOS: 没有要安装的依赖

代码编辑器 / IDE

你可以使用任何你喜欢编辑器. 但我们强烈推荐拥有Rust Analyzer插件的编辑器. Rust Analyzer仍在开发中, 但它已经提供了顶级的自动补全和代码提示. Visual Studio Code拥有官方支持的Rust Analyzer插件.

Rust 学习资料

本书的目的是学习Bevy, 所以不会提供完整的Rust教学. 如果你想学习更多关于Rust语言的内容, 请查看以下资源:

The Rust Book: the best place to learn Rust from scratch
Rust by Example: learn Rust by working through live coding examples

新建一个Bevy项目

现在我们已经准备好新建一个Bevy项目了! Bevy只是正常的Rust依赖项. 你可以将其添加到现有的Rust项目中, 也可以新建一个. 为了完整起见, 我们从零开始.

新建一个可执行的Rust项目

首先, 导航到要在其中创建新项目的文件夹. 然后, 运行以下命令以创建一个包含rust可执行项目的新文件夹：

cargo new my_bevy_game
cd my_bevy_game

现在执行cargo run来编译和运行你的项目. 你应该可以看到Hello, world!打印在命令行中. 用你选择的编辑器中打开my_bevy_game文件夹, 花一些时间来浏览这些文件.

main.rs 是整个程序的入口:

fn main() {
    println!("Hello, world!");
}

Cargo.toml 是你的项目文件. 它包含了诸如名字, 依赖和构建配置等元数据.

[package]
name = "my_bevy_game"
version = "0.1.0"
authors = ["You <you@veryrealemail.com>"]
edition = "2018"

[dependencies]

Enable Fast Compiles (Optional)

Bevy can be built just fine using default configuration on stable Rust. However for maximally fast iterative compiles, we recommend the following configuration:

Enable Bevy's Dynamic Linking Feature: This is the biggest iterative compilation time win and requires no special setup. When you have bevy as a dependency you can run your app with dynamic linking like this:
```
cargo run --features bevy/dynamic
```
LLD linker: The Rust compiler spends a lot of time in the "link" step. LLD is much faster at linking than the default Rust linker. To install LLD, find your OS below and run the given command:
- Ubuntu: sudo apt-get install lld
- Arch: sudo pacman -S lld
- Windows: Ensure you have the latest cargo-binutils
```
cargo install -f cargo-binutils
rustup component add llvm-tools-preview
```
- MacOS: Modern LLD does not yet support MacOS, but we can use zld instead: brew install michaeleisel/zld/zld

Nightly Rust Compiler: This gives access to the latest performance improvements and "unstable" optimizations

# Install the nightly toolchain
rustup toolchain install nightly
# Configure your current project to use nightly (run this command within the project)
rustup override set nightly
# OR configure cargo to use nightly for all projects -- switch back with `rustup default stable`
rustup default nightly

You can use cargo +nightly ... if you don't want to change the default to nightly.

Generic Sharing: Allows crates to share monomorphized generic code instead of duplicating it. In some cases this allows us to "precompile" generic code so it doesn't affect iterative compiles. This is only available on nightly Rust.

To enable fast compiles, install the nightly rust compiler and LLD. Then copy this file to YOUR_WORKSPACE/.cargo/config.toml. For the project in this guide, that would be my_bevy_game/.cargo/config.toml.

将Bevy添加到项目的Cargo.toml

Bevy可以作为一个库在crates.io中获取. 它是Rust的官方软件包库. 找到最新的版本号()并把它加到Cargo.toml文件中:

[package]
name = "my_bevy_game"
version = "0.1.0"
authors = ["You <you@veryrealemail.com>"]
edition = "2018"

[dependencies]
bevy = "0.4" # make sure this is the latest version

再次执行cargo run. Bevy依赖项开始构建. 这需要一点时间, 因为你实际上是从头构建引擎. 你只需要进行一次完整的构建. 以后每次都会很快的!

如果出现问题, 请查看故障排除部分 or 在Discord中寻求帮助.