LibGL: Add Shader and Program class stubs

Userland/Libraries/LibGL/Shaders/Shader.h

@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2022, Stephan Unverwerth <s.unverwerth@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Error.h>
+#include <AK/RefCounted.h>
+#include <AK/RefPtr.h>
+#include <AK/String.h>
+#include <AK/StringView.h>
+#include <AK/Vector.h>
+#include <LibGL/GL/glplatform.h>
+
+namespace GL {
+
+class Shader final : public RefCounted<Shader> {
+public:
+    static NonnullRefPtr<Shader> create(GLenum shader_type);
+
+    void clear_sources() { m_sources.clear(); }
+    ErrorOr<void> add_source(StringView source_code);
+    ErrorOr<void> compile();
+    GLenum type() const { return m_type; }
+
+private:
+    explicit Shader(GLenum shader_type)
+        : m_type { shader_type }
+    {
+    }
+
+    Vector<String> m_sources;
+    GLenum m_type;
+};
+
+}