1 files changed, 26 insertions, 0 deletions
diff --git a/third_party/rust/wgpu-hal/src/gles/emscripten.rs b/third_party/rust/wgpu-hal/src/gles/emscripten.rs
new file mode 100644
index 0000000000..7372dbd369
--- /dev/null
+++ b/third_party/rust/wgpu-hal/src/gles/emscripten.rs
@@ -0,0 +1,26 @@
+extern "C" {
+    /// returns 1 if success. 0 if failure. extension name must be null terminated
+    fn emscripten_webgl_enable_extension(
+        context: std::ffi::c_int,
+        extension: *const std::ffi::c_char,
+    ) -> std::ffi::c_int;
+    fn emscripten_webgl_get_current_context() -> std::ffi::c_int;
+}
+/// Webgl requires extensions to be enabled before using them.
+/// This function can be used to enable webgl extension on emscripten target.
+///
+/// returns true on success
+///
+/// # Safety:
+///
+/// - opengl context MUST BE current
+/// - extension_name_null_terminated argument must be a valid string with null terminator.
+/// - extension must be present. check `glow_context.supported_extensions()`
+pub unsafe fn enable_extension(extension_name_null_terminated: &str) -> bool {
+    unsafe {
+        emscripten_webgl_enable_extension(
+            emscripten_webgl_get_current_context(),
+            extension_name_null_terminated.as_ptr() as _,
+        ) == 1
+    }
+}