LibWeb: Implement WebGL extension OES_standard_derivatives

Author: cqundefine

Libraries/LibWeb/CMakeLists.txt

@@ -1031,6 +1031,7 @@ set(SOURCES
     WebGL/Extensions/EXTRenderSnorm.cpp
     WebGL/Extensions/EXTTextureFilterAnisotropic.cpp
     WebGL/Extensions/EXTTextureNorm16.cpp
+    WebGL/Extensions/OESStandardDerivatives.cpp
     WebGL/Extensions/OESVertexArrayObject.cpp
     WebGL/Extensions/WebGLCompressedTextureS3tc.cpp
     WebGL/Extensions/WebGLCompressedTextureS3tcSrgb.cpp

Libraries/LibWeb/Forward.h

@@ -1236,6 +1236,7 @@ class EXTColorBufferFloat;
 class EXTRenderSnorm;
 class EXTTextureFilterAnisotropic;
 class EXTTextureNorm16;
+class OESStandardDerivatives;
 class OESVertexArrayObject;
 class WebGLCompressedTextureS3tc;
 class WebGLCompressedTextureS3tcSrgb;

Libraries/LibWeb/WebGL/Extensions/OESStandardDerivatives.cpp

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

Libraries/LibWeb/WebGL/Extensions/OESStandardDerivatives.h

@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2025, Undefine <undefine@undefine.pl>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibWeb/Bindings/PlatformObject.h>
+#include <LibWeb/Forward.h>
+
+namespace Web::WebGL::Extensions {
+
+class OESStandardDerivatives : public Bindings::PlatformObject {
+    WEB_PLATFORM_OBJECT(OESStandardDerivatives, Bindings::PlatformObject);
+    GC_DECLARE_ALLOCATOR(OESStandardDerivatives);
+
+public:
+    static JS::ThrowCompletionOr<GC::Ptr<OESStandardDerivatives>> create(JS::Realm&, GC::Ref<WebGLRenderingContext>);
+
+protected:
+    void initialize(JS::Realm&) override;
+    void visit_edges(Visitor&) override;
+
+private:
+    OESStandardDerivatives(JS::Realm&, GC::Ref<WebGLRenderingContext>);
+
+    GC::Ref<WebGLRenderingContext> m_context;
+};
+
+}

Libraries/LibWeb/WebGL/Extensions/OESStandardDerivatives.idl

@@ -0,0 +1,12 @@
+#import <WebGL/Types.idl>
+
+// https://registry.khronos.org/webgl/extensions/OES_standard_derivatives/
+// NOTE: Original OES_standard_derivatives 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 OESStandardDerivatives {
+    const GLenum FRAGMENT_SHADER_DERIVATIVE_HINT_OES = 0x8B8B;
+};

Libraries/LibWeb/WebGL/WebGL2RenderingContext.cpp

@@ -252,6 +252,11 @@ bool WebGL2RenderingContext::angle_instanced_arrays_extension_enabled() const
     return false;
 }
 
+bool WebGL2RenderingContext::oes_standard_derivatives_extension_enabled() const
+{
+    return false;
+}
+
 ReadonlySpan<WebIDL::UnsignedLong> WebGL2RenderingContext::enabled_compressed_texture_formats() const
 {
     return m_enabled_compressed_texture_formats;

Libraries/LibWeb/WebGL/WebGL2RenderingContext.h

@@ -53,6 +53,7 @@ class WebGL2RenderingContext final : public Bindings::PlatformObject
 
     virtual bool ext_texture_filter_anisotropic_extension_enabled() const override;
     virtual bool angle_instanced_arrays_extension_enabled() const override;
+    virtual bool oes_standard_derivatives_extension_enabled() const override;
     virtual ReadonlySpan<WebIDL::UnsignedLong> enabled_compressed_texture_formats() const override;
 
 private:

Libraries/LibWeb/WebGL/WebGLRenderingContext.cpp

@@ -17,6 +17,7 @@
 #include <LibWeb/WebGL/Extensions/ANGLEInstancedArrays.h>
 #include <LibWeb/WebGL/Extensions/EXTBlendMinMax.h>
 #include <LibWeb/WebGL/Extensions/EXTTextureFilterAnisotropic.h>
+#include <LibWeb/WebGL/Extensions/OESStandardDerivatives.h>
 #include <LibWeb/WebGL/Extensions/OESVertexArrayObject.h>
 #include <LibWeb/WebGL/Extensions/WebGLCompressedTextureS3tc.h>
 #include <LibWeb/WebGL/Extensions/WebGLCompressedTextureS3tcSrgb.h>
@@ -98,6 +99,7 @@ void WebGLRenderingContext::visit_edges(Cell::Visitor& visitor)
     visitor.visit(m_angle_instanced_arrays_extension);
     visitor.visit(m_ext_blend_min_max_extension);
     visitor.visit(m_ext_texture_filter_anisotropic);
+    visitor.visit(m_oes_standard_derivatives_object_extension);
     visitor.visit(m_oes_vertex_array_object_extension);
     visitor.visit(m_webgl_compressed_texture_s3tc_extension);
     visitor.visit(m_webgl_compressed_texture_s3tc_srgb_extension);
@@ -208,6 +210,15 @@ JS::Object* WebGLRenderingContext::get_extension(String const& name)
         return m_ext_texture_filter_anisotropic;
     }
 
+    if (name.equals_ignoring_ascii_case("OES_standard_derivatives"sv)) {
+        if (!m_oes_standard_derivatives_object_extension) {
+            m_oes_standard_derivatives_object_extension = MUST(Extensions::OESStandardDerivatives::create(realm(), *this));
+        }
+
+        VERIFY(m_oes_standard_derivatives_object_extension);
+        return m_oes_standard_derivatives_object_extension;
+    }
+
     if (name.equals_ignoring_ascii_case("OES_vertex_array_object"sv)) {
         if (!m_oes_vertex_array_object_extension) {
             m_oes_vertex_array_object_extension = MUST(Extensions::OESVertexArrayObject::create(realm(), *this));
@@ -279,6 +290,11 @@ bool WebGLRenderingContext::angle_instanced_arrays_extension_enabled() const
     return !!m_angle_instanced_arrays_extension;
 }
 
+bool WebGLRenderingContext::oes_standard_derivatives_extension_enabled() const
+{
+    return !!m_oes_standard_derivatives_object_extension;
+}
+
 ReadonlySpan<WebIDL::UnsignedLong> WebGLRenderingContext::enabled_compressed_texture_formats() const
 {
     return m_enabled_compressed_texture_formats;

Libraries/LibWeb/WebGL/WebGLRenderingContext.h

@@ -52,6 +52,7 @@ class WebGLRenderingContext final : public Bindings::PlatformObject
 
     virtual bool ext_texture_filter_anisotropic_extension_enabled() const override;
     virtual bool angle_instanced_arrays_extension_enabled() const override;
+    virtual bool oes_standard_derivatives_extension_enabled() const override;
     virtual ReadonlySpan<WebIDL::UnsignedLong> enabled_compressed_texture_formats() const override;
 
 private:
@@ -88,6 +89,7 @@ class WebGLRenderingContext final : public Bindings::PlatformObject
     GC::Ptr<Extensions::ANGLEInstancedArrays> m_angle_instanced_arrays_extension;
     GC::Ptr<Extensions::EXTBlendMinMax> m_ext_blend_min_max_extension;
     GC::Ptr<Extensions::EXTTextureFilterAnisotropic> m_ext_texture_filter_anisotropic;
+    GC::Ptr<Extensions::OESStandardDerivatives> m_oes_standard_derivatives_object_extension;
     GC::Ptr<Extensions::OESVertexArrayObject> m_oes_vertex_array_object_extension;
     GC::Ptr<Extensions::WebGLCompressedTextureS3tc> m_webgl_compressed_texture_s3tc_extension;
     GC::Ptr<Extensions::WebGLCompressedTextureS3tcSrgb> m_webgl_compressed_texture_s3tc_srgb_extension;

Libraries/LibWeb/WebGL/WebGLRenderingContextBase.h

@@ -46,6 +46,7 @@ class WebGLRenderingContextBase {
     virtual OpenGLContext& context() = 0;
     virtual bool ext_texture_filter_anisotropic_extension_enabled() const = 0;
     virtual bool angle_instanced_arrays_extension_enabled() const = 0;
+    virtual bool oes_standard_derivatives_extension_enabled() const = 0;
     virtual ReadonlySpan<WebIDL::UnsignedLong> enabled_compressed_texture_formats() const = 0;
 
     template<typename T>