Add support for no_std

.github/workflows/ci.yml

@@ -54,6 +54,10 @@ jobs:
     - run: cargo build --verbose --target wasm32-unknown-unknown
       env:
         RUSTFLAGS: --cfg=web_sys_unstable_apis 
+    - run: cargo build --verbose --no-default-features
+    - run: cargo build --verbose --target wasm32-unknown-unknown --no-default-features
+      env:
+        RUSTFLAGS: --cfg=web_sys_unstable_apis 
     - run: cargo test --verbose
     - run: (cd examples/hello && cargo build --features glutin)
     - run: (cd examples/hello && cargo build --target wasm32-unknown-unknown)

Cargo.toml

@@ -27,11 +27,15 @@ name = "glow"
 path = "src/lib.rs"
 
 [dependencies]
+ahash = { version = "0.8.3", default-features = false }
+hashbrown = { version = "0.14.0", default-features = false }
 log = { version = "0.4.16", optional = true }
 
 [features]
+default = ["std"]
 debug_trace_calls = []
 debug_automatic_glGetError = []
+std = ["ahash/std"]
 
 [target.'cfg(target_arch = "wasm32")'.dependencies]
 js-sys = "~0.3"

src/lib.rs

@@ -4,10 +4,14 @@
 #![allow(clippy::unreadable_literal)]
 #![allow(clippy::missing_safety_doc)]
 #![allow(clippy::pedantic)] // For anyone using pedantic and a source dep, this is needed
+#![no_std]
 
+extern crate alloc;
+
+use alloc::string::String;
+use alloc::vec::Vec;
 use core::fmt::Debug;
 use core::hash::Hash;
-use std::collections::HashSet;
 
 mod version;
 pub use version::Version;
@@ -95,7 +99,7 @@ pub trait HasContext {
     type TransformFeedback: Copy + Clone + Debug + Eq + Hash + Ord + PartialEq + PartialOrd;
     type UniformLocation: Clone + Debug;
 
-    fn supported_extensions(&self) -> &HashSet<String>;
+    fn supports_extension(&self, extension: &str) -> bool;
 
     fn supports_debug(&self) -> bool;