1 files changed, 56 insertions, 0 deletions
diff --git a/components/script/dom/webgl_extensions/ext/oesstandardderivatives.rs b/components/script/dom/webgl_extensions/ext/oesstandardderivatives.rs
new file mode 100644
index 00000000000..dfafa7051a5
--- /dev/null
+++ b/components/script/dom/webgl_extensions/ext/oesstandardderivatives.rs
@@ -0,0 +1,56 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+use super::{WebGLExtension, WebGLExtensionSpec, WebGLExtensions};
+use crate::dom::bindings::codegen::Bindings::OESStandardDerivativesBinding::OESStandardDerivativesConstants;
+use crate::dom::bindings::reflector::{reflect_dom_object, DomObject, Reflector};
+use crate::dom::bindings::root::DomRoot;
+use crate::dom::webglrenderingcontext::WebGLRenderingContext;
+use canvas_traits::webgl::WebGLVersion;
+use dom_struct::dom_struct;
+
+#[dom_struct]
+pub struct OESStandardDerivatives {
+    reflector_: Reflector,
+}
+
+impl OESStandardDerivatives {
+    fn new_inherited() -> OESStandardDerivatives {
+        Self {
+            reflector_: Reflector::new(),
+        }
+    }
+}
+
+impl WebGLExtension for OESStandardDerivatives {
+    type Extension = OESStandardDerivatives;
+    fn new(ctx: &WebGLRenderingContext) -> DomRoot<OESStandardDerivatives> {
+        reflect_dom_object(
+            Box::new(OESStandardDerivatives::new_inherited()),
+            &*ctx.global(),
+        )
+    }
+
+    fn spec() -> WebGLExtensionSpec {
+        WebGLExtensionSpec::Specific(WebGLVersion::WebGL1)
+    }
+
+    fn is_supported(ext: &WebGLExtensions) -> bool {
+        // The standard derivatives are always available in desktop OpenGL.
+        !ext.is_gles() || ext.supports_any_gl_extension(&["GL_OES_standard_derivatives"])
+    }
+
+    fn enable(ext: &WebGLExtensions) {
+        ext.enable_hint_target(
+            OESStandardDerivativesConstants::FRAGMENT_SHADER_DERIVATIVE_HINT_OES,
+        );
+        ext.enable_get_parameter_name(
+            OESStandardDerivativesConstants::FRAGMENT_SHADER_DERIVATIVE_HINT_OES,
+        );
+    }
+
+    fn name() -> &'static str {
+        "OES_standard_derivatives"
+    }
+}