[VK] Enabled the feature for Travis CI

Author: sectopod

.travis.yml

@@ -32,13 +32,15 @@ addons:
       - libxcursor1
       - libsdl2-dev
 script:
-  - travis-cargo build
+  - travis-cargo build -- --features vulkan
   - travis-cargo test -- -p gfx_core
   - travis-cargo test -- -p gfx
   - travis-cargo test -- -p gfx_device_gl
   - travis-cargo test -- -p gfx_window_glutin
   - travis-cargo test -- -p gfx_window_glfw
   - travis-cargo test -- -p gfx_window_sdl
+  - travis-cargo test -- -p gfx_device_vulkan
+  - travis-cargo test -- -p gfx_window_vulkan
   - travis-cargo test
 after_success:
   - travis-cargo doc -- -j 1

Cargo.toml

@@ -8,8 +8,8 @@ license = "Apache-2.0"
 authors = ["The Gfx-rs Developers"]
 
 [features]
-default = ["vulkan"]
-vulkan = []
+default = []
+vulkan = ["gfx_device_vulkan", "gfx_window_vulkan"]
 unstable = []
 
 
@@ -24,8 +24,16 @@ gfx_core = { path = "src/core", version = "0.5" }
 gfx = { path = "src/render", version = "0.13" }
 gfx_device_gl = { path = "src/backend/gl", version = "0.12" }
 gfx_window_glutin = { path = "src/window/glutin", version = "0.13" }
-gfx_device_vulkan = { path = "src/backend/vulkan", version = "0.1" }
-gfx_window_vulkan = { path = "src/window/vulkan", version = "0.1" }
+
+[dependencies.gfx_device_vulkan]
+path = "src/backend/vulkan"
+version = "0.1"
+optional = true
+
+[dependencies.gfx_window_vulkan]
+path = "src/window/vulkan"
+version = "0.1"
+optional = true
 
 [target.'cfg(unix)'.dependencies]
 gfx_window_glfw = { path = "src/window/glfw", version = "0.12" }