Screen-size float render target on ATI

Is it possible to create a screen-size (rect texture) pbuffer with floating-point color depth on ATI? On NVIDIA this is done through WGL_TEXTURE_RECTANGLE_NV / WGL_BIND_TO_TEXTURE_RECTANGLE_RGBA.
Render-To-Texture in OpenGL is a pain in the ass. :mad:

Does EXT_render_target + ARB_float_texture~ solves this? By the way, how is the work with EXT_render_target going?