First step for WebGL support.

Cargo.toml

@@ -21,13 +21,21 @@ trace = ["serde", "wgc/trace"]
 replay = ["serde", "wgc/replay"]
 # Make Vulkan backend available on platforms where it is by default not, e.g. macOS
 vulkan-portability = ["wgc/gfx-backend-vulkan"]
+webgl = ["wgc"]
 
 [target.'cfg(not(target_arch = "wasm32"))'.dependencies.wgc]
 package = "wgpu-core"
 git = "https://github.com/gfx-rs/wgpu"
 rev = "4ebe1f50b057046e4d4f015eb006330d62f5fe91"
 features = ["raw-window-handle"]
 
+[target.'cfg(target_arch = "wasm32")'.dependencies.wgc]
+package = "wgpu-core"
+git = "https://github.com/gfx-rs/wgpu"
+rev = "4ebe1f50b057046e4d4f015eb006330d62f5fe91"
+features = ["raw-window-handle"]
+optional = true
+
 [dependencies.wgt]
 package = "wgpu-types"
 git = "https://github.com/gfx-rs/wgpu"

src/backend/mod.rs

@@ -1,15 +1,15 @@
-#[cfg(target_arch = "wasm32")]
+#[cfg(all(target_arch = "wasm32", not(feature = "webgl")))]
 mod web;
-#[cfg(target_arch = "wasm32")]
+#[cfg(all(target_arch = "wasm32", not(feature = "webgl")))]
 pub(crate) use web::{BufferMappedRange, Context};
 
-#[cfg(not(target_arch = "wasm32"))]
+#[cfg(any(not(target_arch = "wasm32"), feature = "webgl"))]
 mod direct;
-#[cfg(not(target_arch = "wasm32"))]
+#[cfg(any(not(target_arch = "wasm32"), feature = "webgl"))]
 mod error;
 
-#[cfg(not(target_arch = "wasm32"))]
+#[cfg(any(not(target_arch = "wasm32"), feature = "webgl"))]
 pub(crate) use direct::{BufferMappedRange, Context};
 
-#[cfg(not(target_arch = "wasm32"))]
+#[cfg(any(not(target_arch = "wasm32"), feature = "webgl"))]
 mod native_gpu_future;