Reorganize dependencies (#46)

* Reorganize dependencies

* Enable logging in the minimal-winit example

* Fix a very minor bug in the minimal-winit example

Cargo.toml

@@ -25,18 +25,44 @@ maintenance = { status = "actively-developed" }
 [dependencies]
 wgpu = "0.4"
 
+# These are only used by the examples, and enabled with features
+# See: https://github.com/rust-lang/cargo/issues/1982
+byteorder = { version = "1.3", optional = true }
+env_logger = { version = "0.7", optional = true }
+getrandom = { version = "0.1", optional = true }
+gilrs = { version = "0.7", optional = true }
+line_drawing = { version = "0.8", optional = true }
+log = { version = "0.4", features = ["release_max_level_warn"], optional = true }
+randomize = { version = "3.0", optional = true }
+simple-invaders = { path = "simple-invaders", optional = true }
+winit = { version = "0.20.0-alpha4", optional = true }
+winit_input_helper = { version = "0.4.0-alpha4", optional = true }
+
 [dev-dependencies]
-byteorder = "1.3"
-env_logger = "0.7"
-getrandom = "0.1"
-gilrs = "0.7"
-line_drawing = "0.8"
-log = { version = "0.4", features = ["release_max_level_warn"] }
 pixels-mocks = { path = "pixels-mocks" }
-randomize = "3.0"
-simple-invaders = { path = "simple-invaders" }
 winit = "0.20.0-alpha4"
-winit_input_helper = "0.4.0-alpha4"
+
+[[example]]
+name = "conway"
+required-features = ["conway"]
+
+[[example]]
+name = "invaders"
+required-features = ["invaders"]
+
+[[example]]
+name = "minimal-winit"
+required-features = ["minimal-winit"]
+
+[features]
+default = []
+log-deps = ["env_logger", "log"]
+random-deps = ["byteorder", "getrandom", "randomize"]
+winit-deps = ["winit", "winit_input_helper"]
+
+conway = ["line_drawing", "log-deps", "random-deps", "winit-deps"]
+invaders = ["gilrs", "log-deps", "random-deps", "simple-invaders", "winit-deps"]
+minimal-winit = ["log-deps", "winit-deps"]
 
 [workspace]
 members = [

examples/conway/README.md

@@ -5,7 +5,7 @@
 ## Running
 
 ```bash
-cargo run --release --example conway
+cargo run --release --example conway --features conway
 ```
 
 ## Controls

examples/invaders/README.md

@@ -7,7 +7,7 @@ The pixels have invaded!
 ## Running
 
 ```bash
-cargo run --release --example invaders
+cargo run --release --example invaders --features invaders
 ```
 
 ## Controls

examples/minimal-winit/README.md

@@ -7,7 +7,7 @@ Minimal example with `winit`.
 ## Running
 
 ```bash
-cargo run --release --example minimal-winit
+cargo run --release --example minimal-winit --features minimal-winit
 ```
 
 ## About

examples/minimal-winit/main.rs

@@ -21,6 +21,7 @@ struct World {
 }
 
 fn main() -> Result<(), Error> {
+    env_logger::init();
     let event_loop = EventLoop::new();
     let mut input = WinitInputHelper::new();
     let window = {
@@ -94,10 +95,10 @@ impl World {
 
     /// Update the `World` internal state; bounce the box around the screen.
     fn update(&mut self) {
-        if self.box_x < 0 || self.box_x + BOX_SIZE >= WIDTH as i16 {
+        if self.box_x <= 0 || self.box_x + BOX_SIZE - 1 >= WIDTH as i16 {
             self.velocity_x *= -1;
         }
-        if self.box_y < 0 || self.box_y + BOX_SIZE >= HEIGHT as i16 {
+        if self.box_y <= 0 || self.box_y + BOX_SIZE - 1 >= HEIGHT as i16 {
             self.velocity_y *= -1;
         }