Allow drawing engine registration via context interfaces

src/openrct2-ui/UiContext.cpp

@@ -0,0 +1,49 @@
+#pragma region Copyright (c) 2014-2016 OpenRCT2 Developers
+/*****************************************************************************
+* OpenRCT2, an open source clone of Roller Coaster Tycoon 2.
+*
+* OpenRCT2 is the work of many authors, a full list can be found in contributors.md
+* For more information, visit https://github.com/OpenRCT2/OpenRCT2
+*
+* OpenRCT2 is free software: you can redistribute it and/or modify
+* it under the terms of the GNU General Public License as published by
+* the Free Software Foundation, either version 3 of the License, or
+* (at your option) any later version.
+*
+* A full copy of the GNU General Public License can be found in licence.txt
+*****************************************************************************/
+#pragma endregion
+
+#include "UiContext.h"
+#include "drawing\engines\DrawingEngines.h"
+
+using namespace OpenRCT2;
+using namespace OpenRCT2::Ui;
+
+class UiContext : public IUiContext
+{
+private:
+    IContext * const _context;
+
+    // Drawing engines
+    SoftwareDrawingEngineFactory        _softwareDrawingFactory;
+    HardwareDisplayDrawingEngineFactory _hardwareDrawingFactory;
+#ifndef DISABLE_OPENGL
+    OpenGLDrawingEngineFactory          _openglDrawingFactory;
+#endif
+
+public:
+    UiContext(IContext * context) :
+        _context(context)
+    {
+    }
+
+    ~UiContext() override
+    {
+    }
+};
+
+IUiContext * OpenRCT2::Ui::CreateContext(IContext * context)
+{
+    return new UiContext(context);
+}