New module: Platform - Split window management from Utility module (#128)

* New module: Platform - Split window management from Utility module

Final touch

* NDK/SDK: Bring back initialization of Utility

src/Nazara/Platform/Platform.cpp

@@ -0,0 +1,108 @@
+// 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
+
+#include <Nazara/Platform/Platform.hpp>
+#include <Nazara/Core/CallOnExit.hpp>
+#include <Nazara/Platform/Config.hpp>
+#include <Nazara/Platform/Cursor.hpp>
+#include <Nazara/Platform/Window.hpp>
+#include <Nazara/Utility/Utility.hpp>
+#include <Nazara/Platform/Debug.hpp>
+
+namespace Nz
+{
+	/*!
+	* \ingroup system
+	* \class Nz::Platform
+	* \brief Platform class that represents the module initializer of Platform
+	*/
+
+	/*!
+	* \brief Initializes the Platform module
+	* \return true if initialization is successful
+	*
+	* \remark Produces a NazaraNotice
+	* \remark Produces a NazaraError if one submodule failed
+	*/
+
+	bool Platform::Initialize()
+	{
+		if (s_moduleReferenceCounter > 0)
+		{
+			s_moduleReferenceCounter++;
+			return true; // Already initialized
+		}
+
+		// Initialize module dependencies
+		if (!Utility::Initialize())
+		{
+			NazaraError("Failed to initialize utility module");
+			return false;
+		}
+
+		s_moduleReferenceCounter++;
+
+		// Initialisation of the module
+		CallOnExit onExit(Platform::Uninitialize);
+
+		if (!Window::Initialize())
+		{
+			NazaraError("Failed to initialize window's system");
+			return false;
+		}
+
+		// Must be initialized after Window
+		if (!Cursor::Initialize())
+		{
+			NazaraError("Failed to initialize cursors");
+			return false;
+		}
+
+		onExit.Reset();
+
+		NazaraNotice("Initialized: Platform module");
+		return true;
+	}
+
+	/*!
+	* \brief Checks whether the module is initialized
+	* \return true if module is initialized
+	*/
+
+	bool Platform::IsInitialized()
+	{
+		return s_moduleReferenceCounter != 0;
+	}
+
+	/*!
+	* \brief Uninitializes the Platform module
+	*
+	* \remark Produces a NazaraNotice
+	*/
+
+	void Platform::Uninitialize()
+	{
+		if (s_moduleReferenceCounter != 1)
+		{
+			// The module is still in use, or can not be uninitialized
+			if (s_moduleReferenceCounter > 1)
+				s_moduleReferenceCounter--;
+
+			return;
+		}
+
+		// Free of module
+		s_moduleReferenceCounter = 0;
+
+		Cursor::Uninitialize(); //< Must be done before Window
+		Window::Uninitialize();
+
+		NazaraNotice("Uninitialized: Platform module");
+
+		// Free of dependances
+		Utility::Uninitialize();
+	}
+
+	unsigned int Platform::s_moduleReferenceCounter = 0;
+}