LibWeb/WebGL2: Implement EXT_color_buffer_float extension

This makes the Point Of Sale model on https://www.shopify.com/ have
colour instead of being completely black.

Libraries/LibWeb/WebGL/Extensions/EXTColorBufferFloat.cpp

@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2025, Luke Wilde <luke@ladybird.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibJS/Runtime/Realm.h>
+#include <LibWeb/Bindings/EXTColorBufferFloatPrototype.h>
+#include <LibWeb/Bindings/Intrinsics.h>
+#include <LibWeb/WebGL/Extensions/EXTColorBufferFloat.h>
+#include <LibWeb/WebGL/OpenGLContext.h>
+#include <LibWeb/WebGL/WebGL2RenderingContext.h>
+
+namespace Web::WebGL::Extensions {
+
+GC_DEFINE_ALLOCATOR(EXTColorBufferFloat);
+
+JS::ThrowCompletionOr<GC::Ptr<EXTColorBufferFloat>> EXTColorBufferFloat::create(JS::Realm& realm, GC::Ref<WebGL2RenderingContext> context)
+{
+    return realm.create<EXTColorBufferFloat>(realm, context);
+}
+
+EXTColorBufferFloat::EXTColorBufferFloat(JS::Realm& realm, GC::Ref<WebGL2RenderingContext> context)
+    : PlatformObject(realm)
+    , m_context(context)
+{
+    m_context->context().request_extension("GL_EXT_color_buffer_float");
+}
+
+void EXTColorBufferFloat::initialize(JS::Realm& realm)
+{
+    Base::initialize(realm);
+    WEB_SET_PROTOTYPE_FOR_INTERFACE(EXTColorBufferFloat);
+}
+
+void EXTColorBufferFloat::visit_edges(Visitor& visitor)
+{
+    Base::visit_edges(visitor);
+    visitor.visit(m_context);
+}
+
+}

Libraries/LibWeb/WebGL/Extensions/EXTColorBufferFloat.h

@@ -0,0 +1,31 @@
+/*
+ * 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>
+
+namespace Web::WebGL::Extensions {
+
+class EXTColorBufferFloat : public Bindings::PlatformObject {
+    WEB_PLATFORM_OBJECT(EXTColorBufferFloat, Bindings::PlatformObject);
+    GC_DECLARE_ALLOCATOR(EXTColorBufferFloat);
+
+public:
+    static JS::ThrowCompletionOr<GC::Ptr<EXTColorBufferFloat>> create(JS::Realm&, GC::Ref<WebGL2RenderingContext>);
+
+protected:
+    void initialize(JS::Realm&) override;
+    void visit_edges(Visitor&) override;
+
+private:
+    EXTColorBufferFloat(JS::Realm&, GC::Ref<WebGL2RenderingContext>);
+
+    GC::Ref<WebGL2RenderingContext> m_context;
+};
+
+}

Libraries/LibWeb/WebGL/Extensions/EXTColorBufferFloat.idl

@@ -0,0 +1,11 @@
+#import <WebGL/Types.idl>
+
+// https://registry.khronos.org/webgl/extensions/EXT_color_buffer_float/
+// NOTE: Original EXT_color_buffer_float name is changed to title case,
+//       so it matches corresponding C++ class name, and does not require
+//       IDL generator to handle snake_case to TitleCase conversion.
+//       Having a different name is totally fine, because LegacyNoInterfaceObject
+//       prevents the name from being exposed to JavaScript.
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface EXTColorBufferFloat {
+};