Question

拥有一个带有小型触摸屏和大显示屏的信息亭系统，我有一个可以在大屏幕上播放视频的应用程序。出于某种原因，当Direct3D停止（应用程序退出）时，两个屏幕都会闪烁（变黑，然后恢复）。

我将问题简化为只打开焦点窗口的程序，初始化Direct3D设备，然后释放它。在释放（或停止程序而不释放）时，两个屏幕都会闪烁。

熟悉Direct3D的人是否可以看到这个并告诉我，我是否做错了什么？

#include <iostream>
#include <windows.h>
#include <d3d9.h>

const char g_szClassName[] = "myWindowClass";

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    switch (msg)
    {
    case WM_CLOSE:
        DestroyWindow(hwnd);
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hwnd, msg, wParam, lParam);
    }
    return 0;
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) {

    WNDCLASSEX wc;

    wc.cbSize = sizeof(WNDCLASSEX);
    wc.style = 0;
    wc.lpfnWndProc = WndProc;
    wc.cbClsExtra = 0;
    wc.cbWndExtra = 0;
    wc.hInstance = hInstance;
    wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
    wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
    wc.lpszMenuName = NULL;
    wc.lpszClassName = g_szClassName;
    wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION);

    if (!RegisterClassEx(&wc)) {
        MessageBox(NULL, "Window Registration Failed!", "Error!", MB_ICONEXCLAMATION | MB_OK);
        return 0;
    }

    HWND hwnd = CreateWindowEx(
        WS_EX_CLIENTEDGE,
        g_szClassName,
        "Focus Window",
        WS_POPUP | WS_VISIBLE,
        CW_USEDEFAULT, CW_USEDEFAULT, 240, 120,
        NULL, NULL, hInstance, NULL);

    if (hwnd == NULL) {
        MessageBox(NULL, "Window Creation Failed!", "Error!", MB_ICONEXCLAMATION | MB_OK);
        return 0;
    }

    ShowWindow(hwnd, nCmdShow);
    UpdateWindow(hwnd);

    IDirect3D9* m_pD3D = Direct3DCreate9(D3D_SDK_VERSION);
    if (m_pD3D == NULL) {
        MessageBox(NULL, "Failed to initialize direct3D!", "Error!", MB_ICONEXCLAMATION | MB_OK);
        return 0;
    }

    // second display is 1920 x 1080

    D3DPRESENT_PARAMETERS m_param;
    ZeroMemory(&m_param, sizeof(m_param));
    m_param.BackBufferWidth = 1920;
    m_param.BackBufferHeight = 1080;
    m_param.BackBufferFormat = D3DFMT_X8R8G8B8;
    m_param.BackBufferCount = 1;
    m_param.MultiSampleType = D3DMULTISAMPLE_NONE;
    m_param.SwapEffect = D3DSWAPEFFECT_COPY;
    m_param.hDeviceWindow = hwnd;
    m_param.Windowed = FALSE;
    m_param.Flags = D3DPRESENTFLAG_VIDEO;
    m_param.FullScreen_RefreshRateInHz = D3DPRESENT_RATE_DEFAULT;
    m_param.PresentationInterval = D3DPRESENT_INTERVAL_ONE;

    HRESULT hr;
    IDirect3DDevice9* m_pD3DD;
    hr = m_pD3D->CreateDevice(
        1,
        D3DDEVTYPE_HAL,
        hwnd,
        D3DCREATE_HARDWARE_VERTEXPROCESSING | D3DCREATE_MULTITHREADED,
        &m_param,
        &m_pD3DD
    );

    if (hr != S_OK) {
        MessageBox(NULL, "Failed to create direct3D device!", "Error!", MB_ICONEXCLAMATION | MB_OK);
        return 0;
    }

    Sleep(3000);

    // flicker occurs here
    m_pD3DD->Release();
    m_pD3D->Release();

    return 0;

}

注意：此程序应在同一视频卡上有2个屏幕的任何设置上运行，但可能需要调整第二个屏幕的宽度/高度（它在BackBufferWidth中进行了硬编码和BackBufferHeight）

Answer 1

不确定这对你是否可行，但在试图围绕互联网的各种例子时，似乎避免闪烁的唯一方法是使用带无边框窗口的窗口模式：

...

HWND hwnd = CreateWindowEx(
    0,
    g_szClassName,
    "Focus Window",
    WS_POPUP | WS_VISIBLE, // <-- borderless window
    800, 0,                // <-- position on 2nd screen
    1920, 1080,            // <-- fill entire 2nd screen
    NULL, NULL, hInstance, NULL);

...

D3DPRESENT_PARAMETERS m_param;
ZeroMemory(&m_param, sizeof(m_param));
m_param.BackBufferWidth = 1920;
m_param.BackBufferHeight = 1080;
m_param.BackBufferFormat = D3DFMT_X8R8G8B8;
m_param.BackBufferCount = 1;
m_param.MultiSampleType = D3DMULTISAMPLE_NONE;
m_param.SwapEffect = D3DSWAPEFFECT_COPY;
m_param.hDeviceWindow = hwnd;
m_param.Windowed = TRUE;   // <-- use windowed mode
m_param.Flags = D3DPRESENTFLAG_VIDEO;
m_param.FullScreen_RefreshRateInHz = D3DPRESENT_RATE_DEFAULT;
m_param.PresentationInterval = D3DPRESENT_INTERVAL_ONE;

如何在多头设置上发布时停止Direct3D闪烁？

1 个答案: