1 files changed, 16 insertions, 4 deletions
diff --git a/components/script/dom/webgl_extensions/extensions.rs b/components/script/dom/webgl_extensions/extensions.rs
index 3c22817d555..7e7ccf301e7 100644
--- a/components/script/dom/webgl_extensions/extensions.rs
+++ b/components/script/dom/webgl_extensions/extensions.rs
@@ -57,17 +57,20 @@ struct WebGLExtensionFeatures {
     hint_targets: FnvHashSet<GLenum>,
     /// WebGL GetParameter() names enabled by extensions.
     disabled_get_parameter_names: FnvHashSet<GLenum>,
+    /// WebGL OES_element_index_uint extension.
+    element_index_uint_enabled: bool,
 }
 
 impl WebGLExtensionFeatures {
     fn new(webgl_version: WebGLVersion) -> Self {
-        let (disabled_tex_types, disabled_get_parameter_names) = match webgl_version {
+        let (disabled_tex_types, disabled_get_parameter_names, element_index_uint_enabled) = match webgl_version {
             WebGLVersion::WebGL1 => {
                 (DEFAULT_DISABLED_TEX_TYPES_WEBGL1.iter().cloned().collect(),
-                 DEFAULT_DISABLED_GET_PARAMETER_NAMES_WEBGL1.iter().cloned().collect())
+                 DEFAULT_DISABLED_GET_PARAMETER_NAMES_WEBGL1.iter().cloned().collect(),
+                 false)
             },
             WebGLVersion::WebGL2 => {
-                (Default::default(), Default::default())
+                (Default::default(), Default::default(), true)
             }
         };
         Self {
@@ -78,6 +81,7 @@ impl WebGLExtensionFeatures {
             query_parameter_handlers: Default::default(),
             hint_targets: Default::default(),
             disabled_get_parameter_names,
+            element_index_uint_enabled,
         }
     }
 }
@@ -96,7 +100,7 @@ impl WebGLExtensions {
         Self {
             extensions: DomRefCell::new(HashMap::new()),
             features: DomRefCell::new(WebGLExtensionFeatures::new(webgl_version)),
-            webgl_version
+            webgl_version,
         }
     }
 
@@ -240,6 +244,14 @@ impl WebGLExtensions {
         self.register::<ext::oestexturehalffloatlinear::OESTextureHalfFloatLinear>();
         self.register::<ext::oesvertexarrayobject::OESVertexArrayObject>();
     }
+
+    pub fn enable_element_index_uint(&self) {
+        self.features.borrow_mut().element_index_uint_enabled = true;
+    }
+
+    pub fn is_element_index_uint_enabled(&self) -> bool {
+        self.features.borrow().element_index_uint_enabled
+    }
 }
 
 // Helper structs