Upgrade to amethyst 0.15, introduce features for choosing backend (#14)

Author: vladbat00

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "amethyst-imgui"
-version = "0.6.1"
+version = "0.7.0"
 description = "imgui library for amethyst"
 license = "CC0-1.0"
 authors = ["Awpteamoose <[email protected]>", "Walter Pearce <[email protected]>"]
@@ -9,14 +9,16 @@ readme = "README.md"
 edition = "2018"
 
 [features]
-default = ["amethyst/vulkan"]
+vulkan = ["amethyst/vulkan"]
+metal = ["amethyst/metal"]
+empty = ["amethyst/empty"]
 shader-compiler = ["amethyst/shader-compiler"]
 docking = []
 
 [dependencies]
 imgui = { version = "0.2" }
 imgui-winit-support = { version = "0.2" }
-amethyst = { version = "0.14" }
+amethyst = { version = "0.15" }
 
 # Development dependencies
 #amethyst = { path = "../amethyst", features = ["saveload", "vulkan", "gltf", "experimental-spirv-reflection", "shader-compiler", "tiles"] }

README.md

@@ -14,18 +14,21 @@ This crate provides an amethyst `RenderPlugin` (available since amethyst 0.12) w
 A minimal example is available at [examples/demo_window.rs](examples/demo_window.rs)
 
 ```
-cargo run --example demo_window --features amethyst/vulkan
+# For Windows/Linux:
+cargo run --example demo_window --features vulkan
+# For MacOS:
+cargo run --example demo_window --features metal
 ```
 
-## Usage 
+## Usage
 
 This crate currently requires including the amethyst crate; this may introduce a full recompilation of amethyst due to differing features. If this is the case, you'll need to clone this git repository and and set the appropriate features.
 
 This create uses the amethyst `shader-compiler`, which relies on `shaderc` to compile its shaders at build  time. Finally, this crate exposes the same rendering features as amethyst, and will pass them along to amethyst.
 
 Example Cargo.toml Usage:
 ```toml
-amethyst-imgui = "0.5"
+amethyst-imgui = { version = "0.7", features = ["vulkan"] }
 ```