Update to gfx-hal 0.5

[sapphire-arches]

Fixes #275

This is probably a breaking change since at least one public type is affected (rendy_resource::image::ImageViewCreationError)

[sapphire-arches]

Note that this also updates the examples from winit-0.20-alpha to winit-0.21, which matches the version used by gfx-hal 0.5.

[sapphire-arches]

Looks like this breaks windows, but I don't have a windows machine to debug on. Seems to be a problem with the Cargo features used for gfx_backend_gl, but I'm not sure how to fix that so some help would be appreciated.

[zicklag]

Hey, I just happened to find this and it turns out I'm working on the gfx-backend-gl crate!

So there are changes that are being backported from hal-0.6 ( master ) that I am working on that should fix that problem ( I think, if it doesn't I should still be able to figure out what's wrong ): gfx-rs/gfx#3216.

I discovered an issue that I have to fix, though, and it might be in the range of a few weeks or so before I fix it ( I don't know, my availability is pretty variable at the moment ).

[str4d]

Is there a reason that this PR is updating to gfx-rs/gfx@6d10d21, rather than gfx-hal 0.5 etc? I applied the following patch to this branch, and the Windows tests run fine on my machine:

diff --git a/core/Cargo.toml b/core/Cargo.toml
index b6bcce1..8641420 100644
--- a/core/Cargo.toml
+++ b/core/Cargo.toml
@@ -26,9 +26,9 @@ vulkan = ["gfx-backend-vulkan"]
 no-slow-safety-checks = []
 
 [dependencies]
-gfx-hal = { git = "https://github.com/gfx-rs/gfx", rev = "6d10d21788fffa6a7ca17888c8d3a4b6265442e7" }
-gfx-backend-empty = { git = "https://github.com/gfx-rs/gfx", rev = "6d10d21788fffa6a7ca17888c8d3a4b6265442e7", optional = true }
-gfx-backend-gl = { git = "https://github.com/gfx-rs/gfx", rev = "6d10d21788fffa6a7ca17888c8d3a4b6265442e7", features = ["glutin"], default_features = false, optional = true }
+gfx-hal = { version = "0.5" }
+gfx-backend-empty = { version = "0.5", optional = true }
+gfx-backend-gl = { version = "0.5", features = ["glutin"], default_features = false, optional = true }
 lazy_static = "1.0"
 log = "0.4"
 parking_lot = "0.9"
@@ -37,10 +37,10 @@ thread_profiler = "0.3"
 raw-window-handle = "0.3"
 
 [target.'cfg(all(target_os = "windows", not(target_arch = "wasm32")))'.dependencies]
-gfx-backend-dx12 = { git = "https://github.com/gfx-rs/gfx", rev = "6d10d21788fffa6a7ca17888c8d3a4b6265442e7", optional = true }
+gfx-backend-dx12 = { version = "0.5", optional = true }
 
 [target.'cfg(any(all(not(target_arch = "wasm32"), target_os = "macos"), all(target_arch = "aarch64", target_os = "ios")))'.dependencies]
-gfx-backend-metal = { git = "https://github.com/gfx-rs/gfx", rev = "6d10d21788fffa6a7ca17888c8d3a4b6265442e7", optional = true }
+gfx-backend-metal = { version = "0.5", optional = true }
 
 [target.'cfg(all(any(target_os = "windows", all(unix, not(any(target_os = "macos", target_os = "ios")))), not(target_arch = "wasm32")))'.dependencies]
-gfx-backend-vulkan = { git = "https://github.com/gfx-rs/gfx", rev = "6d10d21788fffa6a7ca17888c8d3a4b6265442e7", features = ["x11"], optional = true }
+gfx-backend-vulkan = { version = "0.5", features = ["x11"], optional = true }
diff --git a/descriptor/Cargo.toml b/descriptor/Cargo.toml
index f2375a9..cd19479 100644
--- a/descriptor/Cargo.toml
+++ b/descriptor/Cargo.toml
@@ -11,7 +11,7 @@ categories = ["rendering"]
 description = "Rendy's descriptor allocator"
 
 [dependencies]
-gfx-hal = { git = "https://github.com/gfx-rs/gfx", rev = "6d10d21788fffa6a7ca17888c8d3a4b6265442e7" }
+gfx-hal = { version = "0.5" }
 log = "0.4"
 relevant = { version = "0.4", features = ["log"] }
 smallvec = "1.0"
diff --git a/descriptor/src/allocator.rs b/descriptor/src/allocator.rs
index 248832e..fd106ca 100644
--- a/descriptor/src/allocator.rs
+++ b/descriptor/src/allocator.rs
@@ -77,7 +77,8 @@ unsafe fn allocate_from_pool<B: Backend>(
     let sets_were = allocation.len();
     raw.allocate(std::iter::repeat(layout).take(count as usize), allocation)
         .map_err(|err| match err {
-            AllocationError::OutOfMemory(oom) => oom,
+            AllocationError::Host => OutOfMemory::Host,
+            AllocationError::Device => OutOfMemory::Device,
             err => {
                 // We check pool for free descriptors and sets before calling this function,
                 // so it can't be exhausted.
diff --git a/memory/Cargo.toml b/memory/Cargo.toml
index 5f5d548..b3c709f 100644
--- a/memory/Cargo.toml
+++ b/memory/Cargo.toml
@@ -14,7 +14,7 @@ description = "Rendy's memory manager"
 serde-1 = ["serde", "gfx-hal/serde"]
 
 [dependencies]
-gfx-hal = { git = "https://github.com/gfx-rs/gfx", rev = "6d10d21788fffa6a7ca17888c8d3a4b6265442e7" }
+gfx-hal = { version = "0.5" }
 log = "0.4"
 hibitset = {version = "0.6", default-features = false}
 relevant = { version = "0.4", features = ["log"] }

[str4d]

I do get the same errors as CI when running this PR as-is. I think that points to a problem in gfx master rather than this PR. Note that the backport PR @zicklag pointed to above subsequently led to them uncovered that GL is currently completely broken in their master: gfx-rs/gfx#3325 (comment)