New answers tagged directx10
You've basically already answered your question: Render your scene to a texture of the desired size. Render a full-screen quad with that texture applied. You only need a very simple shader to perform step 2.
in the shader file I believe in the vertex shader file you can do something like this: output.texcoord = input.texcoord * 2.0f; What this will do is move the texture UV coord's over 2 units over. What you will do is achieve texture repeating. If you don't you can just either have it times by 1.0f . So, the output would be for the pixelshader or fragment ...
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