투명디스플레이 연구사업

using System;

using System.Runtime.InteropServices;

using UnityEngine;

public class BackgroundKey : MonoBehaviour

{

    #region dll

    [DllImport("Dwmapi.dll")]static extern uint DwmExtendFrameIntoClientArea(IntPtr hWnd, ref Margins margins);

    [DllImport("user32.dll")]static extern int SetWindowLong(IntPtr hWnd, int nIndex, long dwNewLong);

    [DllImport("user32.dll")]public static extern long GetWindowLong(IntPtr hWnd, int nIndex);

    private struct Margins{

        public int Left;

        public int Right;

        public int Top;

        public int Bottom;

    }

    #endregion dll

    #region Private

    private long style;

    private IntPtr thisHwnd;

    private bool active = true;

    [SerializeField]private Material _keyMaterial;

    #endregion Private

    void Start() {

        transform.SetAsFirstSibling();

    }

    public void ActivateTransparency(IntPtr hWnd) {

        thisHwnd = hWnd;

          active = true;

        Color32 c =GetComponent<Camera>().backgroundColor;

        GetComponent<Camera>().backgroundColor=new Color32(c.r,c.g,c.b,5);

#if !UNITY_EDITOR

         style  = GetWindowLong(thisHwnd, -16);

        var m = new Margins() { Left = -1 };

        SetWindowLong(hWnd, -16, 0x80000000 | 0x10000000);

        DwmExtendFrameIntoClientArea(hWnd, ref m);

#endif

    }

    public void DisableTransparency() {

        active = false;

        Color32 c = GetComponent<Camera>().backgroundColor;

        GetComponent<Camera>().backgroundColor = new Color32(c.r, c.g, c.b, 255);

#if !UNITY_EDITOR

        SetWindowLong(thisHwnd, -16, style);

#endif

    }

    void OnRenderImage(RenderTexture a, RenderTexture n)

    {

        if (active) {

            Graphics.Blit(a, n, _keyMaterial);

        }

        else {

            Graphics.Blit(a, n);

        }

    }

}