build: configure some building stuffs

addons/boids/boids.gdextension

@@ -10,6 +10,8 @@ linux.release.x86_64 =   "res://addons/boids/lib/libboids.x86.so"
 windows.release.x86_64 = "res://addons/boids/lib/boids.x86.dll"
 macos.release =          "res://addons/boids/lib/libboids.x86.dylib"
 macos.release.arm64 =    "res://addons/boids/lib/libboids.arm64.dylib"
+web.debug.wasm32 =       "res://rust/target/wasm32-unknown-emscripten/debug/boids.wasm"
+web.release.wasm32 =     "res://addons/boids/lib/boids.wasm"
 
 [icons]
 BoidProperties = "res://addons/boids/resources/boid_properties.svg"

rust/.cargo/config.toml

@@ -0,0 +1,7 @@
+[target.wasm32-unknown-emscripten]
+rustflags = [
+    "-C", "link-args=-sSIDE_MODULE=2",
+    "-C", "link-args=-pthread", # was -sUSE_PTHREADS=1 in earlier emscripten versions
+    "-C", "target-feature=+atomics,+bulk-memory,+mutable-globals",
+    "-Zlink-native-libraries=no"
+]

rust/Cargo.toml

@@ -16,5 +16,8 @@ rayon = { version = "1.10" }
 rustc-hash = "2"
 indexmap = "2.4.0"
 
+[target.wasm32-unknown-emscripten.dependencies]
+godot = { git = "https://github.com/godot-rust/gdext", branch = "master", features = ["api-4-3", "experimental-threads", "register-docs", "experimental-wasm", "lazy-function-tables"] }
+
 [profile.dev]
-opt-level = 3
+opt-level = 1

rust/rust-toolchain.toml

@@ -0,0 +1,3 @@
+[toolchain]
+channel = "nightly"
+targets = ["x86_64-unknown-linux-gnu", "aarch64-apple-darwin", "wasm32-unknown-emscripten"]