c++ - 纹理无法呈现 - DirectX 9

Question

我在 DirectX 9 中有这段代码，我需要从 COM 接口(interface)获取 DC 并绘制它。我确实得到了 DC，它包含图像，但我得到的是黑屏。有什么想法吗？

    LPDIRECT3DSURFACE9 pRenderSurface = NULL, pRenderSurfaceTMP = NULL;

    m_pRenderTexture->GetSurfaceLevel(0, &pRenderSurface);
    if (pRenderSurface == NULL)
        return FALSE;

    m_pD3DDevice->CreateOffscreenPlainSurface(m_nWidth, m_nHeight,
        D3DFMT_X8R8G8B8, D3DPOOL_SYSTEMMEM, &pRenderSurfaceTMP, 0);

    m_pD3DDevice->GetRenderTargetData(pRenderSurface,pRenderSurfaceTMP);

    HDC hDC = NULL;
    hr = pRenderSurfaceTMP->GetDC(&hDC);
    if (FAILED(hr))
        return FALSE;   

    if (m_pViewObject != NULL)
    {
        // RECT is relative to the windowless container rect
        RECTL rcRect = {0, 0, m_nWidth, m_nHeight};  

        // Draw onto the DC!
        hr = m_pViewObject->Draw(DVASPECT_CONTENT, 1,
            NULL, NULL, NULL, hDC, &rcRect, NULL, NULL,
            0);
    }


    pRenderSurface->ReleaseDC(hDC);
    pRenderSurface->Release();


    // Draw the surface
    m_pD3DDevice->SetStreamSource( 0, m_pVertexBuffer, 0, sizeof(Vertex) );
    m_pD3DDevice->SetTexture( 0, m_pRenderTexture );


    hr = m_pD3DDevice->DrawPrimitive(D3DPT_TRIANGLESTRIP, 0, 2);

    m_hbrBackground = NULL;
    pRenderSurfaceTMP->Release();

提前致谢

Answer 1

确保 m_pRenderTexture 是使用 D3DUSAGE_RENDERTARGET 创建的。 pRenderSurface 和 pRenderSurfaceTMP 的大小和格式应该匹配。有关详细信息，请参阅 GetRenderTargetData 何时失败:http://msdn.microsoft.com/en-us/library/windows/desktop/bb174405(v=vs.85).aspx