Direct3D: Creating a render target view from a texture

Question

I would like to create a render target view from a texture, for use in multiple target rendering. I am currently able to create a render target view for the back buffer - all of that works nicely. Further, I am able to create the texture. However, when I try to build the view from it, I get an error.

First, here's the code:

D3D11_TEXTURE2D_DESC textureDesc;
ZeroMemory(&textureDesc, sizeof(textureDesc));

textureDesc.ArraySize = 1;
textureDesc.BindFlags = D3D11_BIND_RENDER_TARGET | D3D11_BIND_SHADER_RESOURCE;
textureDesc.CPUAccessFlags = 0;
textureDesc.Format = DXGI_FORMAT_R32_FLOAT;
textureDesc.Height = m_renderTargetSize.Height;
textureDesc.Width = m_renderTargetSize.Width;
textureDesc.MipLevels = 1;
textureDesc.MiscFlags = 0;
textureDesc.SampleDesc.Count = 1;
textureDesc.SampleDesc.Quality = 0;
textureDesc.Usage = D3D11_USAGE_DEFAULT;

ComPtr<ID3D11Texture2D> texture;
DX::ThrowIfFailed(
    m_d3dDevice->CreateTexture2D(
        &textureDesc,
        nullptr,
        &texture
        )
    );

D3D11_RENDER_TARGET_VIEW_DESC renderTargetViewDescription;
ZeroMemory(&renderTargetViewDescription, sizeof(renderTargetViewDescription));
renderTargetViewDescription.Format = textureDesc.Format;

DX::ThrowIfFailed(
    m_d3dDevice->CreateRenderTargetView(
        texture,
        &renderTargetViewDescription,
        &m_renderTargetView[1]
        )
    );

I am getting the following error from the compiler on the line with the call to CreateRenderTargetView:

Error: no suitable conversion function from "Microsoft::WRL::ComPtr" to "ID3D11Resource *" exists.

According to MSDN, ID3D11Texture2D inherits from ID3D11Resource. Do I have to somehow upcast first?

I am working in DirectX 11, and compiling with vc110.

Answer 1

It seems that WRL's ComPtr doesn't support implicit conversion to T* (unlike ATL's CComPtr), so you need to use the Get method:

DX::ThrowIfFailed(
    m_d3dDevice->CreateRenderTargetView(
        texture.Get(),
        &renderTargetViewDescription,
        &m_renderTargetView[1]
        )
    );