Problem with saving a render target view's content to a texture

Graphics and GPU Programming Programming DX11

Started by pnt1614 May 24, 2012 02:45 AM

5 comments, last by pnt1614 11 years, 11 months ago

407

Author

May 24, 2012 02:45 AM

If I create a new render target and bind to the pipeline with a render target view, then I save that render target view to a texture, it is okay.



       #pragma region Setup the render target texture description

       D3D11_TEXTURE2D_DESC textureDesc;

       textureDesc.Width = 256;

       textureDesc.Height = 256;

       textureDesc.MipLevels = 1;

       textureDesc.ArraySize = 1;

       textureDesc.Format = DXGI_FORMAT_R32G32B32A32_FLOAT;

       textureDesc.SampleDesc.Count = 1;      

       textureDesc.SampleDesc.Quality = 0;

       textureDesc.Usage = D3D11_USAGE_DEFAULT;

       textureDesc.BindFlags = D3D11_BIND_RENDER_TARGET | D3D11_BIND_SHADER_RESOURCE;

       textureDesc.CPUAccessFlags = 0;

       textureDesc.MiscFlags = 0;

       V_RETURN( pd3dDevice->CreateTexture2D( &textureDesc, NULL, &g_pRenderTargetTexture ) );

       #pragma endregion



      #pragma region Setup the description of the render target view

      D3D11_RENDER_TARGET_VIEW_DESC renderTargetViewDesc;

      renderTargetViewDesc.Format = textureDesc.Format;

      renderTargetViewDesc.ViewDimension = D3D11_RTV_DIMENSION_TEXTURE2D;

      renderTargetViewDesc.Texture2D.MipSlice = 0;

      V_RETURN( pd3dDevice->CreateRenderTargetView( g_pRenderTargetTexture, &renderTargetViewDesc, &g_pRenderTargetView) );

     #pragma endregion

However, if I get the current render target view, which is got with a function named DXUTGetD3D11RenderTargetView, then just render. But the same code, saving to a texture, it does not work, everything is black



	    ID3D11Resource *backbufferRes;

        pRTV->GetResource(&backbufferRes);

        D3D11_TEXTURE2D_DESC texDesc;

        texDesc.ArraySize = 1;

        texDesc.BindFlags = 0;

        texDesc.CPUAccessFlags = 0;

        texDesc.Format = DXGI_FORMAT_R32G32B32A32_FLOAT;

        texDesc.Width = 640;  // the current viewport is 640x480

        texDesc.Height = 480; 

        texDesc.MipLevels = 1;

        texDesc.MiscFlags = 0;

        texDesc.SampleDesc.Count = 1;

        texDesc.SampleDesc.Quality = 0;

        texDesc.Usage = D3D11_USAGE_DEFAULT;

        ID3D11Texture2D *texture;

        V( pd3dDevice->CreateTexture2D(&texDesc, 0, &texture) );

        pd3dImmediateContext->CopyResource(texture, backbufferRes);

        hr = D3DX11SaveTextureToFile( pd3dImmediateContext, texture, D3DX11_IFF_JPG, L"test.jpg");



        SAFE_RELEASE( texture );

        SAFE_RELEASE( backbufferRes );

I do not understand the reason, anybody have experienced this problem, help me please. Thank in advance.

MJP

20,295

May 24, 2012 05:25 AM

The CopyResource call is probably failing because the backbuffer isn't the same format as the texture you're creating. You should pass the DEBUG flag when creating the device, and then it will tell you when something goes wrong.

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pnt1614

407

Author

May 24, 2012 06:44 AM

I am using DXUT and the device is created automatically, so how to set DEBUG flag when it is being created?

Tordin

632

May 24, 2012 10:24 AM

i think you can forceenable the debuglayer aswell via the directx controllpanel.

"There will be major features. none to be thought of yet"

21st Century Moose

13,459

May 24, 2012 11:24 AM

Generally I'd do a GetDesc on the backbuffer and then just modify the things I need to change - probably the handiest way of ensuring that formats/sizes/etc always match.

Direct3D has need of instancing, but we do not. We have plenty of glVertexAttrib calls.

MJP

20,295

May 24, 2012 03:58 PM

In your "ModifyDeviceSettings" callback, set the "CreateFlags" member of the D3D11 settings to D3D11_CREATE_DEVICE_DEBUG

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