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OpenGL HDR faking in ogl

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Hi, regarding an opengl implementation of what is generally considered "fake" HDR (in which 8 bit render targets get downsampled + gaussian blurred + filtered back up then blended with the back buffer). All the papers I can find say to render scene once to back buffer, copy to a smaller render target (what opengl call - if any - will do this?) then apply the usual process. If there is no opengl equivalent to the dx strechrect() then I will use a full size render target and compisite that with the results of gaussian filtering a downsampled version.

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