XInput.cs

using System.Runtime.InteropServices;
 
namespace Gondwana.WinForms.Input.Gamepad.XInput;

internal static class XInput
{
    [DllImport("xinput1_4.dll", EntryPoint = "XInputGetState")]
    internal static extern int GetState(int dwUserIndex, out XINPUT_STATE pState);

    [StructLayout(LayoutKind.Sequential)]
    internal struct XINPUT_STATE
    {
        public uint dwPacketNumber;

        public XINPUT_GAMEPAD Gamepad;
    }

    [StructLayout(LayoutKind.Sequential)]
    internal struct XINPUT_GAMEPAD
    {
        public ushort wButtons;

        public byte bLeftTrigger;

        public byte bRightTrigger;

        public short sThumbLX;

        public short sThumbLY;

        public short sThumbRX;

        public short sThumbRY;
    }

    [Flags]
    internal enum XInputButtons : ushort
    {
        A = 0x1000,

        B = 0x2000,

        X = 0x4000,

        Y = 0x8000,

        DPadUp = 0x0001,

        DPadDown = 0x0002,

        DPadLeft = 0x0004,

        DPadRight = 0x0008,

        Start = 0x0010,

        Back = 0x0020,

        LeftShoulder = 0x0100,

        RightShoulder = 0x0200,

        LeftThumb = 0x0040,

        RightThumb = 0x0080,
    }
}