Merge #226

226: check `gl.GetString` return value is `null` in `get_parameter_string` r=grovesNL a=zirconium-n

This fixes segfault (with an panic) under GL context 1.4, which is the default version of GL in WSL2.

Co-authored-by: Ziru Niu <niuzr@sudoprivacy.com>

src/native.rs

@@ -1177,6 +1177,12 @@ impl HasContext for Context {
     unsafe fn get_parameter_string(&self, parameter: u32) -> String {
         let gl = &self.raw;
         let raw_ptr = gl.GetString(parameter);
+        if raw_ptr.is_null() {
+            panic!(
+                "Get parameter string 0x{:X} failed. Maybe your GL context version is too outdated.",
+                parameter
+            )
+        }
         std::ffi::CStr::from_ptr(raw_ptr as *const native_gl::GLchar)
             .to_str()
             .unwrap()