DirectX11鼠标控制

Question

我在DirectX中有一个3D程序，我想让鼠标控制到相机。问题是鼠标从屏幕上移开（在窗口模式下），然后相机不再转动。我试图使用SetCusorPos将鼠标移动后锁定到位。这样我就可以得到一个dx，然后将鼠标设置回屏幕的中心。我最终得到了一个无尽的白色屏幕。这是我到目前为止的相机/鼠标移动代码。如果您需要更多信息，请询问。

void PhysicsApp::OnMouseMove(WPARAM btnState, int x, int y)
{
    // Make each pixel correspond to a quarter of a degree.
    float dx = XMConvertToRadians(0.25f*static_cast<float>(x - mLastMousePos.x));
    float dy = XMConvertToRadians(0.25f*static_cast<float>(y - mLastMousePos.y));

    // Update angles based on input to orbit camera around box.
    mTheta += -dx;
    mPhi   += -dy;
    // Update players direction to always face forward
    playerRotation.y = -mTheta;

    // Restrict the angle mPhi.
    mPhi = MathHelper::Clamp(mPhi, 0.1f, MathHelper::Pi-0.1f);

    if( (btnState & MK_RBUTTON) != 0 )
    {
        // Make each pixel correspond to 0.2 unit in the scene.
        float dx = 0.05f*static_cast<float>(x - mLastMousePos.x);
        float dy = 0.05f*static_cast<float>(y - mLastMousePos.y);

        // Update the camera radius based on input.
        mRadius += dx - dy;

        // Restrict the radius.
        mRadius = MathHelper::Clamp(mRadius, 5.0f, 50.0f);
    }
    mLastMousePos.x = x;
    mLastMousePos.y = y;
}