GL rendering in xscreensaver's flipflop

[John M Flinchbaugh <john@hjsoft.com>]

I'm running Debian unstable (with XFree86) on a ThinkPad R40.

With my Radeon 7500, if I run the flipflop screensaver normally (with
acceleration):
    /usr/lib/xscreensaver/flipflop
the little tiles don't have the nice shadows on the edges which give it
a nice 3D look, but it does run nice and fast (42fps by its own count).

If i run it as:
    LIBGL_ALWAYS_INDIRECT=true /usr/lib/xscreensaver/flipflop
the rendering is much nicer with the proper shadows on the edges, so
they look rectangular.  The framerate is only 35fps then, and CPU usage
greatly increases (since I guess it's software rendering).

Am I missing something in my XFree86 config to let the accelerated 3D
Radeon driver render this better?

Here are the sections of my XF86Config-4 that look pertinent:
Section "Module"
        Load  "GLcore"
        Load  "dbe"
        Load  "dri"
        Load  "extmod"
        Load  "glx"
        ...
EndSection
Section "Device"
        Option     "hw_cursor"
        Option      "AGPMode" "4x"
        Option      "AGPFastWrite" "true"
        Identifier  "Card0"
        Driver      "radeon"
        VendorName  "All"
        BoardName   "All"
EndSection

-- 
John M Flinchbaugh
john@hjsoft.com

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