LibWeb/WebGL: Implement WEBGL_compressed_texture_s3tc extension

Author: https://github.com/Lubrsi
Commit: 958938655d
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/3385

Libraries/LibWeb/WebGL/Extensions/WebGLCompressedTextureS3tc.h

@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2025, Luke Wilde <luke@ladybird.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibWeb/Bindings/PlatformObject.h>
+#include <LibWeb/Forward.h>
+#include <LibWeb/WebGL/WebGLRenderingContextBase.h>
+
+namespace Web::WebGL::Extensions {
+
+class WebGLCompressedTextureS3tc : public Bindings::PlatformObject {
+    WEB_PLATFORM_OBJECT(WebGLCompressedTextureS3tc, Bindings::PlatformObject);
+    GC_DECLARE_ALLOCATOR(WebGLCompressedTextureS3tc);
+
+public:
+    static JS::ThrowCompletionOr<GC::Ptr<WebGLCompressedTextureS3tc>> create(JS::Realm&, WebGLRenderingContextBase*);
+
+protected:
+    void initialize(JS::Realm&) override;
+    void visit_edges(Visitor&) override;
+
+private:
+    WebGLCompressedTextureS3tc(JS::Realm&, WebGLRenderingContextBase*);
+
+    // FIXME: It should be GC::Ptr instead of raw pointer, but we need to make WebGLRenderingContextBase inherit from PlatformObject first.
+    WebGLRenderingContextBase* m_context;
+};
+
+}