It doesn’t show up in the extension string, so that may be more than a little telling, but if you ignore that you can setup the extension’s functions. It’s even in ATI’s extension loading library. Based on some with my Radeon 9700, however, it doesn’t look like works at all. I get an invalid enum error with:
This extension is supported on the Radeon 8000 series and later
platforms.
In order to ensure that Radeon 8000 series will accelerate point
sprite rendering using TCL hardware, make sure that the point sprite
R mode is set to GL_ZERO. (This is the default.)
Radeon 8000 series can render points as large as 2047.