Hi,

I am completely new to the mipmapping technique. I have read some documents over the MSDN, but somehow I cannot connect all of the pieces together.

I'd like to have generated mipmaps for my terrain. I have a DDS texture which is loaded by using:

HRESULT CreateDDSTextureFromFile( _In_ ID3D11Device*, _In_z_ const wchar_t*,  _Out_opt_ ID3D11Resource**, _Out_opt_ ID3D11ShaderResourceView**, _In_ size_t maxsize = 0 )

from DirectXTK. So, by reading the document http://msdn.microsoft.com/en-us/library/windows/desktop/bb205131(v=vs.85).aspx I wrote such code:

_result = CreateDDSTextureFromFile( device, filename, &_texture, NULL );
D3D11_SHADER_RESOURCE_VIEW_DESC srvDesc;
D3D11_RESOURCE_DIMENSION type; 
_texture->GetType( &type );
if( type == D3D11_RESOURCE_DIMENSION_TEXTURE2D ) {    
    D3D11_TEXTURE2D_DESC desc;    
    ID3D11Texture2D *pTexture2D = (ID3D11Texture2D*)_texture;    
    pTexture2D->GetDesc( &desc );    
    srvDesc.Format = desc.Format;    
    srvDesc.ViewDimension = D3D11_SRV_DIMENSION_TEXTURE2D;    
    srvDesc.Texture2D.MipLevels = desc.MipLevels; // when I put here 0 I can't see my terrain    
    srvDesc.Texture2D.MostDetailedMip = desc.MipLevels - 1;    
    ID3D11ShaderResourceView *pSRView = NULL;    device->CreateShaderResourceView( _texture, &srvDesc, &m_texture );}

after that, in the place where I pass resources to shaders I put:

// ...

deviceContext->Unmap( m_lightBuffer, 0 );

// here is what I add, the "texture" is the "m_texture" from the code above
deviceContext->GenerateMips( texture ); 

deviceContext->PSSetConstantBuffers( 0, 1, &m_lightBuffer ); 
deviceContext->PSSetShaderResources(0, 1, &texture); 

// ...

but it doesn't work, when I put to MipLevels 0 as it was written in some document to generate mipmaps my terrain doesn't show up. When I leave it with desc.MipLevels there are no mipmaps. What step did I overlook?

Thank you.

Thank you for your answer. I have finally solved it an I thought that it will be good to share this to others that are using DirectXTK.
The DirectXTK has another function:

HRESULT CreateDDSTextureFromFileEx( _In_ ID3D11Device* d3dDevice,
                                        _In_z_ const wchar_t* szFileName,
                                        _In_ size_t maxsize,
                                        _In_ D3D11_USAGE usage,
                                        _In_ unsigned int bindFlags,
                                        _In_ unsigned int cpuAccessFlags,
                                        _In_ unsigned int miscFlags,
                                        _In_ bool forceSRGB,
                                        _Out_opt_ ID3D11Resource** texture,
                                        _Out_opt_ ID3D11ShaderResourceView** textureView
                                    );

to this function I can pass the required flags, as you said the D3D11_BIND_RENDER_TARGET and the D3D11_RESOURCE_MISC_GENERATE_MIPS.

I have created a DDS with custom mipmaps that differs a lot from the original picture, so I could clearly see that on a terrain. When I called GenerateMips the mipmaps from DDS has been hid by the generated ones (I think so :D), so it means that it finally works.