You need the
xf86-video-ati driver, it should be already installed.
If it's not the case, you'll install it with:
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equo install xf86-video-ati
After that, check opengl with
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eselect opengl list
xorg-x11 should be selected - should be marked with an asterisk like this:
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Available OpenGL implementations:
[1] xorg-x11 *
If something different is selected run
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eselect opengl set xorg-x11
to change it.
Another thing to check is, if the radeon module gets loaded. Look in
/etc/conf.d/modules and you should have the following line there:
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modules="radeon"
If it's missing, just add it.
After reboot the the open source driver should be used (actually it's the only one which works with your card).