~ 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/CursorImpl.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/Core/Error.hpp>
+#include <Nazara/Platform/Debug.hpp>
+#include <Nazara/Platform/SDL2/CursorImpl.hpp>
+#include <Nazara/Utility/Image.hpp>
+#include <Nazara/Utility/PixelFormat.hpp>
+
+namespace Nz
+{
+	bool CursorImpl::Create(const Image& cursor, int hotSpotX, int hotSpotY)
+	{
+		m_iconImage = cursor;
+		if (!m_iconImage.Convert(PixelFormatType_BGRA8))
+		{
+			NazaraError("Failed to convert icon to BGRA8");
+			return false;
+		}
+
+		m_icon = SDL_CreateRGBSurfaceWithFormatFrom(
+			m_iconImage.GetPixels(),
+			m_iconImage.GetWidth(),
+			m_iconImage.GetHeight(),
+			32,
+			32 * m_iconImage.GetWidth(),
+			SDL_PIXELFORMAT_BGRA8888
+			);
+
+		if (!m_icon)
+		{
+			NazaraError(SDL_GetError());
+
+			return false;
+		}
+
+		m_cursor = SDL_CreateColorCursor(m_icon, hotSpotX, hotSpotY);
+
+		if (!m_cursor)
+		{
+			NazaraError(SDL_GetError());
+
+			return false;
+		}
+
+		return true;
+	}
+
+	bool CursorImpl::Create(SystemCursor cursor)
+	{
+		if (cursor != SystemCursor_None)
+			m_cursor = SDL_CreateSystemCursor(s_systemCursorIds[cursor]);
+		else
+			m_cursor = nullptr;
+
+		m_icon = nullptr;
+
+		return true;
+	}
+
+	void CursorImpl::Destroy()
+	{
+		if (m_icon)
+			SDL_FreeSurface(m_icon);
+
+		if (m_cursor)
+			SDL_FreeCursor(m_cursor);
+	}
+
+	SDL_Cursor* CursorImpl::GetCursor()
+	{
+		return m_cursor;
+	}
+
+	bool CursorImpl::Initialize()
+	{
+		return true;
+	}
+
+	void CursorImpl::Uninitialize()
+	{
+	}
+
+	std::array<SDL_SystemCursor, SystemCursor_Max + 1> CursorImpl::s_systemCursorIds =
+	{
+		SDL_SYSTEM_CURSOR_CROSSHAIR,                     // SystemCursor_Crosshair
+		SDL_SYSTEM_CURSOR_ARROW,                         // SystemCursor_Default
+		SDL_SYSTEM_CURSOR_HAND,                          // SystemCursor_Hand
+		SDL_SYSTEM_CURSOR_ARROW,                         // SystemCursor_Help
+		SDL_SYSTEM_CURSOR_SIZEALL,                       // SystemCursor_Move
+		SDL_NUM_SYSTEM_CURSORS,                          // SystemCursor_None
+		SDL_SYSTEM_CURSOR_HAND,                          // SystemCursor_Pointer
+		SDL_SYSTEM_CURSOR_WAITARROW,                     // SystemCursor_Progress
+		SDL_SYSTEM_CURSOR_SIZEWE,                        // SystemCursor_ResizeE
+		SDL_SYSTEM_CURSOR_SIZENS,                        // SystemCursor_ResizeN
+		SDL_SYSTEM_CURSOR_SIZENESW,                      // SystemCursor_ResizeNE
+		SDL_SYSTEM_CURSOR_SIZENWSE,                      // SystemCursor_ResizeNW
+		SDL_SYSTEM_CURSOR_SIZENS,                        // SystemCursor_ResizeS
+		SDL_SYSTEM_CURSOR_SIZENWSE,                      // SystemCursor_ResizeSE
+		SDL_SYSTEM_CURSOR_SIZENESW,                      // SystemCursor_ResizeSW
+		SDL_SYSTEM_CURSOR_SIZEWE,                        // SystemCursor_ResizeW
+		SDL_SYSTEM_CURSOR_IBEAM,                         // SystemCursor_Text
+		SDL_SYSTEM_CURSOR_WAIT                           // SystemCursor_Wait
+	};
+
+	static_assert(SystemCursor_Max + 1 == 18, "System cursor array is incomplete");
+}