LibWeb/WebGL: Implement WEBGL_draw_buffers extension

Author: https://github.com/Lubrsi
Commit: 55f7cb4f10
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/3239
Reviewed-by: https://github.com/awesomekling
Reviewed-by: https://github.com/kalenikaliaksandr

Libraries/LibWeb/WebGL/Extensions/WebGLDrawBuffers.cpp

@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2025, Luke Wilde <luke@ladybird.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibJS/Runtime/Realm.h>
+#include <LibWeb/Bindings/Intrinsics.h>
+#include <LibWeb/Bindings/WebGLDrawBuffersPrototype.h>
+#include <LibWeb/WebGL/Extensions/WebGLDrawBuffers.h>
+#include <LibWeb/WebGL/OpenGLContext.h>
+#include <LibWeb/WebGL/WebGLRenderingContext.h>
+
+#define GL_GLEXT_PROTOTYPES 1
+#include <GLES2/gl2.h>
+#include <GLES2/gl2ext.h>
+
+namespace Web::WebGL::Extensions {
+
+GC_DEFINE_ALLOCATOR(WebGLDrawBuffers);
+
+JS::ThrowCompletionOr<GC::Ptr<WebGLDrawBuffers>> WebGLDrawBuffers::create(JS::Realm& realm, GC::Ref<WebGLRenderingContext> context)
+{
+    return realm.create<WebGLDrawBuffers>(realm, context);
+}
+
+WebGLDrawBuffers::WebGLDrawBuffers(JS::Realm& realm, GC::Ref<WebGLRenderingContext> context)
+    : PlatformObject(realm)
+    , m_context(context)
+{
+    m_context->context().request_extension("GL_EXT_draw_buffers");
+}
+
+void WebGLDrawBuffers::draw_buffers_webgl(Vector<GLenum> buffers)
+{
+    m_context->context().make_current();
+    glDrawBuffersEXT(buffers.size(), buffers.data());
+}
+
+void WebGLDrawBuffers::initialize(JS::Realm& realm)
+{
+    Base::initialize(realm);
+    WEB_SET_PROTOTYPE_FOR_INTERFACE(WebGLDrawBuffers);
+}
+
+void WebGLDrawBuffers::visit_edges(Visitor& visitor)
+{
+    Base::visit_edges(visitor);
+    visitor.visit(m_context);
+}
+
+}