add an option about display server protocol, and create document `doc…

…s/cargo_features.md` (#249)

add an option about display server protocol, and create document `docs/cargo_features.md`

Cargo.toml

@@ -13,7 +13,7 @@ readme = "README.md"
 exclude = ["assets/**/*", "tools/**/*", ".github/**/*", "crates/**/*"]
 
 [features]
-default = ["bevy_audio", "bevy_gltf", "bevy_wgpu", "bevy_winit", "png", "hdr", "mp3"]
+default = ["bevy_audio", "bevy_gltf", "bevy_wgpu", "bevy_winit", "png", "hdr", "mp3", "x11"]
 profiler = ["bevy_ecs/profiler", "bevy_diagnostic/profiler"]
 wgpu_trace = ["bevy_wgpu/trace"]
 
@@ -29,6 +29,10 @@ vorbis = ["bevy_audio/vorbis"]
 
 serialize = ["bevy_input/serialize"]
 
+# Display server protocol support (X11 is enabled by default)
+wayland = ["bevy_winit/wayland"]
+x11 = ["bevy_winit/x11"]
+
 [workspace]
 members = [
     "crates/*",

README.md

@@ -73,4 +73,8 @@ Bevy is only possible because of the hard work put into these foundational techn
 * [winit](https://github.com/rust-windowing/winit): cross platform window creation and management in Rust
 * [spirv-reflect](https://github.com/gwihlidal/spirv-reflect-rs): Reflection API in rust for SPIR-V shader byte code
 
+## [Bevy Cargo Features](docs/cargo_features.md)
+
+The cargo features provided by Bevy, could be enabled for certain usages.
+
 Additionally, we would like to thank the [Amethyst](https://github.com/amethyst/amethyst), [macroquad](https://github.com/not-fl3/macroquad), [coffee](https://github.com/hecrj/coffee), [ggez](https://github.com/ggez/ggez), and [Piston](https://github.com/PistonDevelopers/piston) projects for providing solid examples of game engine development in Rust. If you are looking for a Rust game engine, it is worth considering all of your options. Each engine has different design goals and some will likely resonate with you more than others. 

crates/bevy_winit/Cargo.toml

@@ -9,6 +9,10 @@ repository = "https://github.com/bevyengine/bevy"
 license = "MIT"
 keywords = ["bevy"]
 
+[features]
+wayland = ["winit/wayland"]
+x11 = ["winit/x11"]
+
 [dependencies]
 # bevy
 bevy_app = { path = "../bevy_app", version = "0.1" }
@@ -18,5 +22,5 @@ bevy_math = { path = "../bevy_math", version = "0.1" }
 bevy_window = { path = "../bevy_window", version = "0.1" }
 
 # other
-winit = { version = "0.22.2", package = "cart-tmp-winit", default-features = false, features = ["x11"] }
+winit = { version = "0.22.2", package = "cart-tmp-winit", default-features = false}
 log = { version = "0.4", features = ["release_max_level_info"] }

docs/cargo_features.md

@@ -0,0 +1,61 @@
+# Cargo Features
+
+## Default Features
+
+### bevy_audio
+
+Audio support. All audio formats support depends on this.
+
+### bevy_gltf
+
+[glTF](https://www.khronos.org/gltf/) support.
+
+### bevy_winit
+
+GUI support.
+
+### bevy_wgpu
+
+Make use of GPU via [WebGPU](https://gpuweb.github.io/gpuweb/) support.
+
+### png 
+
+PNG picture format support. 
+
+### hdr
+
+[HDR](https://en.wikipedia.org/wiki/High_dynamic_range) support.
+
+### mp3
+
+Audio of mp3 format support.
+
+### x11
+
+Make GUI applications use X11 procotol. You could enable wayland feature to override this.
+
+## Optional Features
+
+### profiler
+
+For profiler.
+
+### wgpu_trace
+
+For tracing wgpu.
+
+### flac
+
+FLAC audio fromat support. It's included in bevy_audio feature.
+
+### wav
+
+WAV audio format support.
+
+### vorbis 
+
+Vorbis audio format support.
+
+### wayland
+
+Enable this to use Wayland display server protocol other than X11.

examples/README.md

@@ -1,7 +1,10 @@
 # Examples
 
 These examples demonstrate the main features of Bevy and how to use them.
-To run an example, use the command `cargo run --example <Example>`.
+To run an example, use the command `cargo run --example <Example>`, and add the option `--features x11` or `--features wayland` to force the example to run on a specific window compositor, e.g.
+```
+cargo run --features wayland hello_world
+```
 
 ## Hello, World!