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Downsampling and Upsampling

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Hi guys,


I'm not sure about a few things relating to downsampling and upsampling. If it matters, I'm only downsampling to 1/2 the screen size.


Should I use point sampling and do all the work myself in a shader, or should I use linear sampling and enhance that with a shader ?




I'm pretty sure I use D3D11_TEXTURE_ADDRESS_CLAMP, is that right ?


Also, do I simply render a quad with coordinates (-1,-1...1,1) ? That seems fine but I want to make sure.


And finally, about upsampling, do I need to do anything special to bring it back to screen size ?


I know there are a few techniques like average, tent, etc., I will try them all but first I want to make sure I'm doing the basics correctly.


Thanks a lot.


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