From d63d367ec041a54ecf537abe6942159ba0bdb404 Mon Sep 17 00:00:00 2001
From: Seivan Heidari <seivan.heidari@icloud.com>
Date: Thu, 21 Feb 2019 21:30:41 +0100
Subject: [PATCH] Allow creating a surface by passing a metal layer.

This is useful if you're using `SDL2`
```rust
    let canvas = window.into_canvas().build().unwrap();
    let metal_layer = unsafe { sdl2::sys::SDL_RenderGetMetalLayer(canvas.raw()) };
    let surface = instance.create_surface_with_metal_layer(metal_layer);
```
---
 wgpu-rs/src/lib.rs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/wgpu-rs/src/lib.rs b/wgpu-rs/src/lib.rs
index 8bff0c44c8..d14409ba0f 100644
--- a/wgpu-rs/src/lib.rs
+++ b/wgpu-rs/src/lib.rs
@@ -242,6 +242,13 @@ impl Instance {
             id: wgn::wgpu_instance_create_surface_from_winit(self.id, window),
         }
     }
+    
+    #[cfg(feature = "metal")]
+    pub fn create_surface_with_metal_layer(&self, window: *mut std::ffi::c_void) -> Surface {
+        Surface {
+            id: wgn::wgpu_instance_create_surface_from_macos_layer(self.id, window),
+        }
+    }
 }
 
 impl Adapter {