LibGL+LibGPU+LibSoftGPU: Load SoftGPU driver dynamically

This loads libsoftgpu.so during GLContext creation and instantiates the
device class which is then passed into the GLContext constructor.

Userland/Libraries/LibGPU/Driver.h

@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2022, Stephan Unverwerth <s.unverwerth@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Error.h>
+#include <AK/NonnullOwnPtr.h>
+#include <AK/NonnullRefPtr.h>
+#include <AK/RefCounted.h>
+#include <AK/StringView.h>
+#include <AK/Weakable.h>
+#include <LibGPU/Device.h>
+#include <LibGfx/Size.h>
+
+namespace GPU {
+
+class Driver final
+    : public RefCounted<Driver>
+    , public Weakable<Driver> {
+public:
+    static ErrorOr<NonnullRefPtr<Driver>> try_create(StringView driver_name);
+    ~Driver();
+
+    ErrorOr<NonnullOwnPtr<Device>> try_create_device(Gfx::IntSize size);
+
+private:
+    Driver(void* dlopen_result, serenity_gpu_create_device_t device_creation_function)
+        : m_dlopen_result { dlopen_result }
+        , m_serenity_gpu_create_device { device_creation_function }
+    {
+        VERIFY(dlopen_result);
+        VERIFY(device_creation_function);
+    }
+
+    void* const m_dlopen_result { nullptr };
+    serenity_gpu_create_device_t m_serenity_gpu_create_device { nullptr };
+};
+
+}