查看DX10中Buffer数据

简单来说需要先copyResources至新Buffer中，再Map，文档详见：Copying and Accessing Resource Data (Direct3D 10).

 

新Buffer的创建如下：（其中RainVertex为自定义的顶点格式）

   

// 测试CPU读取Streamoutput结果 [2/2/2012 dell]
    D3D10_BUFFER_DESC staginDESC;
    ZeroMemory(&staginDESC, sizeof(staginDESC));
    staginDESC.ByteWidth = sizeof(RainVertex) * g_numRainVertices;;
    staginDESC.CPUAccessFlags = D3D10_CPU_ACCESS_READ;
    staginDESC.Usage = D3D10_USAGE_STAGING;
    staginDESC.BindFlags = 0;
    staginDESC.MiscFlags = 0;

    V_RETURN(pd3dDevice->CreateBuffer(&staginDESC, NULL, &g_pCPUAccess));

 

拷贝操作如下：

  

// 测试streamOutput结果 [2/2/2012 dell]
    pd3dDevice->CopyResource(g_pCPUAccess, g_pParticleStreamTo);
    void* mapSubData;
    HRESULT hr;
    hr = g_pCPUAccess->Map(D3D10_MAP_READ,0, (void**)&mapSubData);
    RainVertex *pBoolArr=(RainVertex*)mapSubData;
    g_pCPUAccess->Unmap();

 

DirectX SDK BasicComputer11 demo中也有示例：

//--------------------------------------------------------------------------------------
// Create a CPU accessible buffer and download the content of a GPU buffer into it
// This function is very useful for debugging CS programs
//--------------------------------------------------------------------------------------
ID3D11Buffer* CreateAndCopyToDebugBuf( ID3D11Device* pDevice, ID3D11DeviceContext* pd3dImmediateContext, ID3D11Buffer* pBuffer ) {
    ID3D11Buffer* debugbuf = NULL;

    D3D11_BUFFER_DESC desc;
    ZeroMemory( &desc, sizeof(desc) );
    pBuffer->GetDesc( &desc );
    desc.CPUAccessFlags = D3D11_CPU_ACCESS_READ;
    desc.Usage = D3D11_USAGE_STAGING;
    desc.BindFlags = 0;
    desc.MiscFlags = 0;
    if ( SUCCEEDED(pDevice->CreateBuffer(&desc, NULL, &debugbuf)) )
    {
#if defined(DEBUG) || defined(PROFILE)
        debugbuf->SetPrivateData( WKPDID_D3DDebugObjectName, sizeof( "Debug" ) - 1, "Debug" );
#endif

        pd3dImmediateContext->CopyResource( debugbuf, pBuffer );
    }

    return debugbuf;
}