DirectX 11 framebuffer capture (C , no Win32 or D3DX)

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DirectX 11 framebuffer capture (C  , no Win32 or D3DX)ID3D11Texture2D* pSurface;HRESULT hr = m_swapChain->GetBuffer( 0, __uuidof( ID3D11Texture2D ), reinterpret_cast< void** >( &pSurface ) );if( pSurface ){    const int width = static_cast<int>(m_window->Bounds.Width * m_dpi / 96.0f);    const int height = static_cast<int>(m_window->Bounds.Height * m_dpi / 96.0f);    unsigned int size = width * height;    if( m_captureData )    {        freeFramebufferData( m_captureData );    }    m_captureData = new unsigned char[ width * height * 4 ];     ID3D11Texture2D* pNewTexture = NULL;     D3D11_TEXTURE2D_DESC description =    {        width, height, 1, 1, DXGI_FORMAT_R8G8B8A8_UNORM,        { 1, 0 }, // DXGI_SAMPLE_DESC        D3D11_USAGE_STAGING,        0, D3D11_CPU_ACCESS_READ | D3D11_CPU_ACCESS_WRITE, 0    };     HRESULT hr = m_d3dDevice->CreateTexture2D( &description, NULL, &pNewTexture );    if( pNewTexture )    {        m_d3dContext->CopyResource( pNewTexture, pSurface );        D3D11_MAPPED_SUBRESOURCE resource;        unsigned int subresource = D3D11CalcSubresource( 0, 0, 0 );        HRESULT hr = m_d3dContext->Map( pNewTexture, subresource, D3D11_MAP_READ, 0, &resource );        //resource.pData; // TEXTURE DATA IS HERE         const int pitch = width << 2;        const unsigned char* source = static_cast< const unsigned char* >( resource.pData );        unsigned char* dest = m_captureData;        for( int i = 0; i < height; ++i )        {            memcpy( dest, source, width * 4 );            source += pitch;            dest += pitch;        }         m_captureSize = size;        m_captureWidth = width;        m_captureHeight = height;         return;    }     freeFramebufferData( m_captureData );}       ID3D11Texture2D* pSurface;HRESULT hr = m_swapChain->GetBuffer( 0, __uuidof( ID3D11Texture2D ), reinterpret_cast< void** >( &pSurface ) );if( pSurface ){    const int width = static_cast<int>(m_window->Bounds.Width * m_dpi / 96.0f);    const int height = static_cast<int>(m_window->Bounds.Height * m_dpi / 96.0f);    unsigned int size = width * height;    if( m_captureData )    {        freeFramebufferData( m_captureData );    }    m_captureData = new unsigned char[ width * height * 4 ];     ID3D11Texture2D* pNewTexture = NULL;     D3D11_TEXTURE2D_DESC description;    pSurface->GetDesc( &description );    description.BindFlags = 0;    description.CPUAccessFlags = D3D11_CPU_ACCESS_READ | D3D11_CPU_ACCESS_WRITE;    description.Usage = D3D11_USAGE_STAGING;     HRESULT hr = m_d3dDevice->CreateTexture2D( &description, NULL, &pNewTexture );    if( pNewTexture )    {        m_d3dContext->CopyResource( pNewTexture, pSurface );        D3D11_MAPPED_SUBRESOURCE resource;        unsigned int subresource = D3D11CalcSubresource( 0, 0, 0 );        HRESULT hr = m_d3dContext->Map( pNewTexture, subresource, D3D11_MAP_READ_WRITE, 0, &resource );        //resource.pData; // TEXTURE DATA IS HERE         const int pitch = width << 2;        const unsigned char* source = static_cast< const unsigned char* >( resource.pData );        unsigned char* dest = m_captureData;        for( int i = 0; i < height; ++i )        {            memcpy( dest, source, width * 4 );            source += pitch;            dest += pitch;        }         m_captureSize = size;        m_captureWidth = width;        m_captureHeight = height;         return;    }     freeFramebufferData( m_captureData );}

原理：创建一个新的texture2D,允许写入。利用

m_d3dContext->CopyResource

进行写入。利用

m_d3dContext->Map 进行读取。