KeyboardTest

KeyboardTestGame.cs

using System;
using System.Runtime.InteropServices;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;

namespace KeyboardTest
{
	unsafe class KeyboardTestGame : Game
	{
		GraphicsDeviceManager graphics;

		KeyboardState oldKeyboardState = new KeyboardState();
		byte* oldSdlKeyboardState;

		public KeyboardTestGame()
		{
			graphics = new GraphicsDeviceManager(this);
			graphics.PreferredBackBufferWidth = 1280;
			graphics.PreferredBackBufferHeight = 720;
			Content.RootDirectory = "Content";

			Window.AllowUserResizing = true;
			IsMouseVisible = true;

			SDL2.SDL.SDL_GetKeyboardState(out int numkeys);
			oldSdlKeyboardState = (byte*) Marshal.AllocHGlobal(numkeys);
		}

		protected override void Update(GameTime gameTime)
		{
			var keyboardState = Keyboard.GetState();

			foreach (var key in keyboardState.GetPressedKeys())
			{
				if (!oldKeyboardState.IsKeyDown(key))
				{
					Console.WriteLine("XNA key: " + key.ToString());
				}
			}

			byte* sdlKeyboardState = (byte*) SDL2.SDL.SDL_GetKeyboardState(out int numkeys);

			for (int scancode = 0; scancode < numkeys; scancode += 1)
			{
				if (sdlKeyboardState[scancode] != 0 && oldSdlKeyboardState[scancode] == 0)
				{
					Console.WriteLine("SDL key: " + (SDL2.SDL.SDL_Scancode) scancode);
				}
			}

			oldKeyboardState = keyboardState;
			Buffer.MemoryCopy(sdlKeyboardState, oldSdlKeyboardState, numkeys, numkeys);

			base.Update(gameTime);
		}

		protected override void Draw(GameTime gameTime)
		{
			GraphicsDevice.Clear(Color.CornflowerBlue);

			base.Draw(gameTime);
		}
	}
}