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连续捕获鼠标输入后，即。左右点击，切换到其他软件（如谷歌浏览器）时电脑会变得非常滞后，但当你结束框架几秒钟后会恢复正常，没有滞后。

在我创建 Graphics 对象之前，该框架工作正常。因此，我怀疑 Graphics 类有问题，但我仍然无法找出导致此性能问题的部分。

图形类

图形.h

#ifndef GRAPHICS_H
#define GRAPHICS_H

#include <d3d9.h>

class Graphics
{
public:
    Graphics();
    ~Graphics();
    void initialize(HWND hWnd, int backBufferWidth, int backBufferHeight);
    void BeginFrame();
    void EndFrame();

private:
    IDirect3D9*       direct3D9;
    IDirect3DDevice9* d3dDevice;
};

#endif

图形.cpp

#include "Graphics.h"

Graphics::Graphics()
{
}

Graphics::~Graphics()
{
    //  Release the device when exiting.
    d3dDevice->Release();
    //  Reset pointer to NULL.
    d3dDevice = NULL;
}

void Graphics::initialize(HWND hWnd, int backBufferWidth, int backBufferHeight)
{
    //  Define Direct3D 9.
    direct3D9 = Direct3DCreate9(D3D_SDK_VERSION);

    //  Define how the screen presents.
    D3DPRESENT_PARAMETERS d3dPP;
    ZeroMemory(&d3dPP, sizeof(d3dPP));

    d3dPP.Windowed           = true;
    d3dPP.SwapEffect         = D3DSWAPEFFECT_DISCARD;
    d3dPP.BackBufferFormat   = D3DFMT_X8R8G8B8;
    d3dPP.BackBufferCount    = 1;
    d3dPP.BackBufferWidth    = backBufferWidth;
    d3dPP.BackBufferHeight   = backBufferHeight;
    d3dPP.hDeviceWindow      = hWnd;

    //  Create a Direct3D 9 device.
    direct3D9->CreateDevice(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, hWnd, 
    D3DCREATE_SOFTWARE_VERTEXPROCESSING, &d3dPP, &d3dDevice);
}

void Graphics::BeginFrame()
{
    //  Clear the back buffer.
    d3dDevice->Clear(0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(0, 0, 0), 1.0f, 0);

    //  Begin the scene
    d3dDevice->BeginScene();
}

void Graphics::EndFrame()
{
    //  End the scene
    d3dDevice->EndScene();

    //  Present the back buffer to screen
    d3dDevice->Present(NULL, NULL, NULL, NULL);
}

如果您想检查所有代码，这是我的整个项目：https ://www.dropbox.com/s/p4nm57fzqse12t7/Zero%20DirectX%20Framework.rar

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