using System;
using System.Runtime.InteropServices;
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: [url]https://msdn.microsoft.com/en-us/library/windows/desktop/ms633591%28v=vs.85%29.aspx[/url]
SetWindowLong(hwnd, GWL_STYLE, WS_POPUP | WS_VISIBLE);
// Extend the window into the client area
See: [url]https://msdn.microsoft.com/en-us/library/windows/desktop/aa969512%28v=vs.85%29.aspx[/url]
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);
}
}
