如何实现unity工程的透明窗体效果，正常运行在QNX下

在windows下的实现方案

using System.Runtime.InteropServices;
using System;
using UnityEngine;

public class TransparentWindow : MonoBehaviour
{
    [SerializeField] private Material m_Material;

    private struct MARGINS
    {
        public int cxLeftWidth;
        public int cxRightWidth;
        public int cyTopHeight;
        public int cyBottomHeight;
    }

    // Define function signatures to import from Windows APIs

    [DllImport("user32.dll")]
    private static extern IntPtr GetActiveWindow();

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

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


    // Definitions of window styles
    const int GWL_STYLE = -16;
    const uint WS_POPUP = 0x80000000;
    const uint WS_VISIBLE = 0x10000000;

    void Start()
    {
#if !UNITY_EDITOR
        var margins = new MARGINS() {cxLeftWidth = -1};

        // Get a handle to the window
        var hwnd = GetActiveWindow();

        // Set properties of the window
        // See: https://msdn.microsoft.com/en-us/library/windows/desktop/ms633591%28v=vs.85%29.aspx
        SetWindowLong(hwnd, GWL_STYLE, WS_POPUP | WS_VISIBLE);

        // Extend the window into the client area
        //See: https://msdn.microsoft.com/en-us/library/windows/desktop/aa969512%28v=vs.85%29.aspx 
        DwmExtendFrameIntoClientArea(hwnd, ref margins);
#endif
    }

    // Pass the output of the camera to the custom material
    // for chroma replacement
    void OnRenderImage(RenderTexture from, RenderTexture to)
    {
        Graphics.Blit(from, to, m_Material);
    }
}

现在问题是，如何在QNX下实现上面的代码功能

理论上将这些在Windows上的api，在QNX上找到即可。实际上不一定能一一对应找到，找到了也不一定好用