Question Unity always renders on top on win32. (HWND)

use unity : 2020.3.15f2 (window 10)
I am exporting the project to Visual Studio and working in Main.cpp .


a childWindow was created in the win32 environment and rendered as a window window through the -parentHWND option.


in windows order, unity should be at the back.


but there is a problem that when I activate the Unity window, it renders to the front.


Create one Root CreateWindow in win32 environment,

I created two WS_CHILD boxes, Unity Window and Gray Window.

And the order is arranged so that the Gray Window is at the top.

When Unity is rendered, the Unity screen is always newer than the Gray Window.

I tried minimizing the Unity window to check. If it is minimized, the order is obviously correct, but

When re-enabled, the Unity window will rise to the top.

I want to put the component window on top of the unity window.

Ask for help.

how can I adjust d window order in win32 environment?

 

Unity - Manual: Command line arguments (unity3d.com)
https://docs.unity3d.com/uploads/Examples/EmbeddedWindow.zip


In the EmbeddedWindow winform example, the same issue occurs when placing the component on top of the unity panel.

Unity obscures the component.

 

Code (CSharp):

1. #include "PrecompiledHeader.h"
2. #include "..\UnityPlayerStub\Exports.h"
3. #include <stdio.h>
4. #include <Processthreadsapi.h>
5. #include <future>
6. #include <iostream>
7. #include <string>
8. #include <Windows.h>
9. #include <Windowsx.h>
10.  
11.  
12. using namespace std;
13.  
14. #include <gl/GL.h>
15. #include <gl/GLU.h>
16.  
17. // Hint that the discrete gpu should be enabled on optimus/enduro systems
18. // NVIDIA docs: http://developer.download.nvidia.com/devzone/devcenter/gamegraphics/files/OptimusRenderingPolicies.pdf
19. // AMD forum post: http://devgurus.amd.com/thread/169965
20. extern "C"
21. {
22.     __declspec(dllexport) DWORD NvOptimusEnablement = 0x00000001;
23.     __declspec(dllexport) int AmdPowerXpressRequestHighPerformance = 1;
24. }
25.  
26.  
27. HWND rootHandle;
28. HWND parentHandle;
29. HWND grayHandle;
30. HWND unityParentHandle;
31. HWND unityHandle;
32.  
33.  
34. LRESULT CALLBACK WndProc(HWND    hWnd,            // Handle For This Window
35.     UINT    uMsg,            // Message For This Window
36.     WPARAM    wParam,            // Additional Message Information
37.     LPARAM    lParam)            // Additional Message Information
38. {
39.     return DefWindowProc(hWnd, uMsg, wParam, lParam);
40. }
41.  
42.  
43. typedef int (*unityFN)(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPWSTR lpCmdLine, int nShowCmd);
44.  
45.  
46. LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
47.  
48. HINSTANCE g_hInst;
49.  
50. LPCTSTR lpszClass = TEXT("First");
51.  
52. constexpr const wchar_t kUnityWindowClassName[] = L"RUNNER_WIN32_WINDOW_UNITY";
53. constexpr const wchar_t kWindowClassName[] = L"RUNNER_WIN32_WINDOW_UNITY1";
54.  
55. // scale factor
56. int Scale(int source, double scale_factor) {
57.     return static_cast<int>(source * scale_factor);
58. }
59.  
60. LRESULT CALLBACK UnityWndProc(HWND const window,
61.     UINT const message,
62.     WPARAM const wparam,
63.     LPARAM const lparam) noexcept {
64.  
65.     LRESULT result = DefWindowProc(window, message, wparam, lparam);
66.  
67.     if (message == WM_ACTIVATE) {
68.         printf("WM_ACTIVATE");
69.  
70.         if (wparam == WA_ACTIVE) {
71.             return 0;
72.         }
73.  
74.     }
75.     else if (message == WM_ACTIVATEAPP) {
76.         printf("WM_ACTIVATEAPP");
77.     }
78.  
79.     SetWindowPos(unityHandle, HWND_BOTTOM, 80, 80, 200, 200, SWP_NOMOVE | SWP_NOSIZE);
80.     //SetWindowPos(unityParentHandle, grayHandle, 80, 80, 200, 200, SWP_NOMOVE | SWP_NOSIZE);
81.     SetWindowPos(grayHandle, HWND_NOTOPMOST, 80, 80, 200, 200, SWP_NOMOVE | SWP_NOSIZE);
82.  
83.    
84.    
85.     return result;
86. }
87.  
88.  
89.  
90. void FindUnityWindow(HWND hWnd, LPARAM lParam) {
91.  
92.     unityHandle = hWnd;
93.  
94.     auto mainThread = GetWindowThreadProcessId(reinterpret_cast<HWND>(rootHandle), nullptr);
95.     auto unityMainThread = GetWindowThreadProcessId(unityHandle, nullptr);
96.     AttachThreadInput(mainThread, unityMainThread, FALSE);
97.     AttachThreadInput(unityMainThread, mainThread, FALSE);
98.  
99.     SendMessageA(hWnd, WM_ACTIVATE, WA_ACTIVE, 0);
100.     MoveWindow(unityHandle, 0, 0, 150, 150, true);
101. }
102.  
103. BOOL CALLBACK FindProcessesWindowEnum(HWND hWnd, LPARAM lParam)
104. {
105.     TCHAR className[256] = { 0 };
106.     GetClassName(hWnd, className, 256);
107.  
108.     if (className != NULL && wcscmp(className, L"UnityWndClass") == 0) {
109.         FindUnityWindow(hWnd, lParam);
110.         return true;
111.     }
112.  
113.     return false;
114. }
115.  
116. void thread_function(HWND child, HWND parent, HWND gray)
117. {
118.  
119.     unityParentHandle = child;
120.     parentHandle = parent;
121.     grayHandle = gray;
122.  
123.     //ShowWindow(child, SW_SHOWMINNOACTIVE);
124.  
125.     //SetWindowPos(parent, HWND_TOPMOST, 80, 80, 200, 200, SWP_NOMOVE | SWP_NOSIZE);
126.  
127.  
128.     while (unityHandle == nullptr)
129.         EnumChildWindows(child, FindProcessesWindowEnum, NULL);
130.  
131.  
132.     //SetParent(child, parent);
133.     //SetWindowPos(child, HWND_BOTTOM, 0, 0, 200, 200, SWP_NOMOVE | SWP_NOSIZE);
134.  
135.  
136. }
137.  
138.  
139.  
140.  
141. int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPWSTR lpCmdLine, int nShowCmd)
142. {
143.  
144.     HWND hWnd;
145.     MSG Message;
146.     WNDCLASS WndClass;
147.     g_hInst = hInstance;
148.  
149.     WndClass.cbClsExtra = 0;
150.     WndClass.cbWndExtra = 0;
151.     WndClass.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
152.     WndClass.hCursor = LoadCursor(NULL, IDC_ARROW);
153.     WndClass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
154.     WndClass.hInstance = hInstance;
155.     WndClass.lpfnWndProc = WndProc;
156.     WndClass.lpszClassName = lpszClass;
157.     WndClass.lpszMenuName = NULL;
158.     WndClass.style = CS_HREDRAW | CS_VREDRAW;
159.     RegisterClass(&WndClass);
160.  
161.     hWnd = CreateWindow(lpszClass, lpszClass, WS_OVERLAPPEDWINDOW | WS_VISIBLE,
162.         CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
163.         NULL, (HMENU)NULL, hInstance, NULL);
164.  
165.     ShowWindow(hWnd, nShowCmd);
166.  
167.     WNDCLASS unity_window_class{};
168.     unity_window_class.hCursor = LoadCursor(nullptr, IDC_ARROW);
169.     unity_window_class.lpszClassName = kUnityWindowClassName;
170.     unity_window_class.style = CS_HREDRAW | CS_VREDRAW;
171.     unity_window_class.cbClsExtra = 0;
172.     unity_window_class.cbWndExtra = 0;
173.     unity_window_class.hInstance = GetModuleHandle(nullptr);
174.  
175.     //window_class.hbrBackground = 0;
176.     unity_window_class.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
177.     unity_window_class.lpszMenuName = nullptr;
178.     unity_window_class.lpfnWndProc = UnityWndProc;
179.     RegisterClass(&unity_window_class);
180.  
181.  
182.     HWND window = CreateWindow(kUnityWindowClassName, L"aa", WS_VISIBLE | WS_CHILD, 0, 0, 200, 200, hWnd, nullptr, (HINSTANCE)GetWindowLongPtr(hWnd, GWLP_HINSTANCE), NULL);
183.  
184.  
185.     WNDCLASS window_class{};
186.     window_class.hCursor = LoadCursor(nullptr, IDC_ARROW);
187.     window_class.lpszClassName = kWindowClassName;
188.     window_class.style = CS_HREDRAW | CS_VREDRAW;
189.     window_class.cbClsExtra = 0;
190.     window_class.cbWndExtra = 0;
191.     window_class.hInstance = GetModuleHandle(nullptr);
192.  
193.     //window_class.hbrBackground = 0;
194.     window_class.hbrBackground = (HBRUSH)GetStockObject(LTGRAY_BRUSH);
195.     window_class.lpszMenuName = nullptr;
196.     window_class.lpfnWndProc = WndProc;
197.     RegisterClass(&window_class);
198.  
199.  
200.     HWND window2 = CreateWindow(kWindowClassName, L"aaaa", WS_VISIBLE | WS_CHILD, 50, 50, 200, 200, hWnd, nullptr, (HINSTANCE)GetWindowLongPtr(hWnd, GWLP_HINSTANCE), NULL);
201.  
202.     //SetParent(window, window2);
203.  
204.     /*
205.     Win32Window window;
206.     Win32Window::Point origin(10, 10);
207.     Win32Window::Size size(1280, 720);
208.     window.CreateAndShow(L"flutter_acrylic_example", origin, size);
209.  
210.     const int hwndParamsSize = 10;
211.     const int showCmd = 10;
212.     auto dllHandle = LoadLibrary(L"UnityPlayer.dll");
213.     auto funcHandle = GetProcAddress(dllHandle, "UnityMain");
214.     unityFN unityFunc = (unityFN)funcHandle;
215.  
216.     auto cmd = GetCommandLine();
217.     auto hwndStr = std::to_wstring((int)hWnd);
218.     auto cmdStr = std::wstring(cmd);
219.     int i = cmdStr.size() - hwndParamsSize;
220.     for (int j = 0; i < cmdStr.size() - hwndParamsSize + hwndStr.size(); i++, j++)
221.     {
222.         cmd[i] = hwndStr[j];
223.     }
224.     cmd[i] = 0;
225.  
226.     unityFunc(0, 0, L"", showCmd);
227.     */
228.     std::string scmdLine = std::string("-parentHWND ") + std::to_string((uint64_t)window).c_str();
229.  
230.     //std::string scmdLine = std::string("-parentHWND '") + std::to_string((uint64_t)window).c_str() + std::string("' delayed");
231.  
232.     LPWSTR output = NULL;
233.     int lenA = lstrlenA(scmdLine.c_str());
234.     int lenW = ::MultiByteToWideChar(CP_ACP, 0, scmdLine.c_str(), lenA, NULL, 0);
235.     if (lenW > 0)
236.     {
237.         output = new wchar_t[lenW];
238.         ::MultiByteToWideChar(CP_ACP, 0, scmdLine.c_str(), lenA, output, lenW);
239.     }
240.  
241.     rootHandle = hWnd;
242.  
243.     thread _t1(thread_function, window, hWnd, window2);
244.  
245.     UnityMain(hInstance, hPrevInstance, output, nShowCmd);
246.  
247.     while (GetMessage(&Message, NULL, 0, 0))
248.     {
249.  
250.         TranslateMessage(&Message);
251.         DispatchMessage(&Message);
252.  
253.     }
254.  
255.     return (int)Message.wParam;
256. }
257.  

 

As you can see, no matter what you do, the Unity render window is always on top.
Can you tell me what I'm doing wrong in the code?
The white window is the parent window of Unity passed as args.
I want to feed the
z-order in the same way as the parent window.

 

Please check the comments above, I have been having a difficult issue for a few weeks.
thank you.

 

I changed it through SetWindowLongPtr ,

WM_ACTIVATE was received.

But no change...

What am I doing wrong here?

Code (CSharp):

1.  
2. WNDPROC prevWndProc;
3. LRESULT __stdcall UnityWndProc(HWND const window,
4.     UINT const message,
5.     WPARAM const wparam,
6.     LPARAM const lparam) noexcept {
7.  
8.     if (message == WM_ACTIVATE) {
9.  
10.         if (wparam == WA_ACTIVE) {
11.             LRESULT result = CallWindowProc(prevWndProc, window, message, wparam, lparam);
12.  
13.             SetWindowPos(window, HWND_BOTTOM, 80, 80, 200, 200, SWP_NOMOVE | SWP_NOSIZE);
14.             SetWindowPos(grayHandle, HWND_TOPMOST, 80, 80, 200, 200, SWP_NOMOVE | SWP_NOSIZE);
15.  
16.             return result;          
17.         }
18.  
19.  
20.     }
21.    
22.     return DefWindowProc(window, message, wparam, lparam);
23. }
24.  
25. void FindUnityWindow(HWND hWnd, LPARAM lParam) {
26.  
27.     unityHandle = hWnd;
28.  
29.     prevWndProc = reinterpret_cast<WNDPROC>(SetWindowLongPtr(hWnd, GWLP_WNDPROC, reinterpret_cast<LONG_PTR>(UnityWndProc)));
30.  
31.     auto mainThread = GetWindowThreadProcessId(reinterpret_cast<HWND>(rootHandle), nullptr);
32.     auto unityMainThread = GetWindowThreadProcessId(unityHandle, nullptr);
33.     AttachThreadInput(mainThread, unityMainThread, FALSE);
34.     AttachThreadInput(unityMainThread, mainThread, FALSE);
35.  
36.     SendMessage(hWnd, WM_ACTIVATE, WA_ACTIVE, 0);
37.     MoveWindow(unityHandle, 0, 0, 150, 150, true);
38. }

 

If you check with spy++ through the above source code, you have the lower layer.

 

I tried adjusting the Windows HWND in real time.

It is confirmed that Unity's render area is still eating TOP.
(Look at the order of overlapping window bars on the screen)

ChildWindow is placed on top, but Unity's OpenGL View area is the problem.

 

I'm using OpenGL with the standard build.

This is to use Windows Unity as a framework, and it is necessary to mix Unity and UI frameworks.

 

I was running with the OpenGL Core graphics engine.

PlayerConnection initialized from C:/Users/Noah/Documents/EmbeddedWindow-1/build/bin/EmbeddedWindow_Data (debug = 0)

PlayerConnection initialized network socket : 0.0.0.0 55340

Multi-casting "[IP] 118.220.130.140 [Port] 55340 [Flags] 2 [Guid] 3725785989 [EditorId] 1648985591 [Version] 1048832 [Id] WindowsPlayer(NOAH-IMAC-5K) [Debug] 0 [PackageName] WindowsPlayer [ProjectName] EmbeddedWindow" to [225.0.0.222:54997]...

Started listening to [0.0.0.0:55340]

PlayerConnection already initialized - listening to [0.0.0.0:55340]

Initialize engine version: 2020.3.15f2 (6cf78cb77498)

[Subsystems] Discovering subsystems at path C:/Users/Noah/Documents/EmbeddedWindow-1/build/bin/EmbeddedWindow_Data/UnitySubsystems

GfxDevice: creating device client; threaded=1

Renderer: AMD Radeon Pro 5700 XT

Vendor:   ATI Technologies Inc.

Version:  4.5.13587 Core Profile Forward-Compatible/Debug Context FireGL 19.50.32.03 26.20.15032.3004

GLES:     0

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ne3 GL_ATI_texture_float GL_ATI_texture_mirror_once GL_EXT_abgr GL_EXT_bgra GL_EXT_bindable_uniform GL_EXT_blend_color GL_EXT_blend_equation_separate GL_EXT_blend_func_separate GL_EXT_blend_minmax GL_EXT_blend_subtract GL_EXT_compiled_vertex_array GL_EXT_copy_buffer GL_EXT_copy_texture GL_EXT_depth_bounds_test GL_EXT_direct_state_access GL_EXT_draw_buffers2 GL_EXT_draw_instanced GL_EXT_draw_range_elements GL_EXT_fog_coord GL_EXT_framebuffer_blit GL_EXT_framebuffer_multisample GL_EXT_framebuffer_object GL_EXT_framebuffer_sRGB GL_EXT_geometry_shader4 GL_EXT_gpu_program_parameters GL_EXT_gpu_shader4 GL_EXT_histogram GL_EXT_memory_object GL_EXT_memory_object_win32 GL_EXT_multi_draw_arrays GL_EXT_packed_depth_stencil GL_EXT_packed_float GL_EXT_packed_pixels GL_EXT_pixel_buffer_object GL_EXT_point_parameters GL_EXT_polygon_offset_clamp GL_EXT_provoking_vertex GL_EXT_rescale_normal GL_EXT_secondary_color GL_EXT_semaphore GL_EXT_semaphore_win32 GL_EXT_separate_specular_color GL_EXT_shader_image_load_store GL_EXT_sha

der_integer_mix GL_EXT_shadow_funcs GL_EXT_stencil_wrap GL_EXT_subtexture GL_EXT_texgen_reflection GL_EXT_texture3D GL_EXT_texture_array GL_EXT_texture_buffer_object GL_EXT_texture_compression_bptc GL_EXT_texture_compression_latc GL_EXT_texture_compression_rgtc GL_EXT_texture_compression_s3tc GL_EXT_texture_cube_map GL_EXT_texture_edge_clamp GL_EXT_texture_env_add GL_EXT_texture_env_combine GL_EXT_texture_env_dot3 GL_EXT_texture_filter_anisotropic GL_EXT_texture_integer GL_EXT_texture_lod GL_EXT_texture_lod_bias GL_EXT_texture_mirror_clamp GL_EXT_texture_object GL_EXT_texture_rectangle GL_EXT_texture_sRGB GL_EXT_texture_sRGB_R8 GL_EXT_texture_sRGB_RG8 GL_EXT_texture_sRGB_decode GL_EXT_texture_shared_exponent GL_EXT_texture_snorm GL_EXT_texture_storage GL_EXT_texture_swizzle GL_EXT_timer_query GL_EXT_transform_feedback GL_EXT_vertex_array GL_EXT_vertex_array_bgra GL_EXT_vertex_attrib_64bit GL_IBM_texture_mirrored_repeat GL_INTEL_fragment_shader_ordering GL_KHR_context_flush_control GL_KHR_debug GL_KHR_no_erro

r GL_KHR_parallel_shader_compile GL_KHR_robust_buffer_access_behavior GL_KHR_robustness GL_KTX_buffer_region GL_NV_alpha_to_coverage_dither_control GL_NV_blend_square GL_NV_conditional_render GL_NV_copy_depth_to_color GL_NV_copy_image GL_NV_depth_buffer_float GL_NV_explicit_multisample GL_NV_float_buffer GL_NV_half_float GL_NV_primitive_restart GL_NV_shader_atomic_int64 GL_NV_texgen_reflection GL_NV_texture_barrier GL_OES_EGL_image GL_SGIS_generate_mipmap GL_SGIS_texture_edge_clamp GL_SGIS_texture_lod GL_SUN_multi_draw_arrays GL_WIN_swap_hint WGL_EXT_swap_control

OPENGL LOG: Creating OpenGL 4.5 graphics device ; Context level  <OpenGL 4.5> ; Context handle 65537

Microsoft Media Foundation video decoding to texture disabled: graphics device is OpenGL Core, only Direct3D 11 and Direct3D 12 (only on desktop) are supported.

<RI> Initializing input.

<RI> Input initialized.

<RI> Initialized touch support.

UnloadTime: 7.148900 ms

 

Direct also has the same problem.
I must use OpenGL.
you can reproduce it by creating a Unity empty project and pasting the corresponding CPP file.
I need a solution to put another UI component on top of the Unity Window. Ask for help.

 

In my case, I had a very similar problem. The Unity child window was always rendered on top of everything even if it was at the bottom with regards to Z-order.

The solution was to create a UnityContainerWindow in which I then put the actual Unity window.