~ Initial SDL2 implementation

Limitation
- Dependent projects need to set NAZARA_PLATFORM_SDL2 if nazara has been build with SDL2 since OpenGL.hpp (and maybe some other headers) exposes platform details
- SDL2 window doesn't supports async window since the API isn't fitting for now
- Contexts parameters can't be changed until we close all the SDL windows (SDL limitation)

src/Nazara/Platform/SDL2/InputImpl.hpp

@@ -0,0 +1,30 @@
+// Copyright (C) 2017 Jérôme Leclercq
+// This file is part of the "Nazara Engine - Platform module"
+// For conditions of distribution and use, see copyright notice in Config.hpp
+
+#pragma once
+
+#ifndef NAZARA_INPUTIMPL_HPP
+#define NAZARA_INPUTIMPL_HPP
+
+#include <Nazara/Core/String.hpp>
+#include <Nazara/Math/Vector2.hpp>
+#include <Nazara/Platform/Keyboard.hpp>
+#include <Nazara/Platform/Mouse.hpp>
+
+namespace Nz
+{
+	class EventImpl
+	{
+		public:
+			static String GetKeyName(Keyboard::Key key);
+			static Vector2i GetMousePosition();
+			static Vector2i GetMousePosition(const Window& relativeTo);
+			static bool IsKeyPressed(Keyboard::Key key);
+			static bool IsMouseButtonPressed(Mouse::Button button);
+			static void SetMousePosition(int x, int y);
+			static void SetMousePosition(int x, int y, const Window& relativeTo);
+	};
+}
+
+#endif // NAZARA_INPUTIMPL_HPP