PDA

View Full Version : programmable tesselation unit



V-man
12-23-2007, 08:59 AM
What is a programmable tesselation unit?
http://ati.amd.com/products/Radeonhd2900/specs.html

Is it the old tesselator? I think it was called pn-triangles
Or this is the one and the same, geometry shader unit?

Groovounet
12-23-2007, 11:08 AM
Currently I don't think it does more than the good old Radeon 7000 pn-trinagles tesselator... The API it's exposed neither in Direct3D neither in OpenGL... "Fixed tessellation unit" would be more appropriate so far.

However, I saw a great lecture during Siggraph 2007 demonstrating the possibilities of the tessellation unit with a terrain rendering demo based on a CLOD algorithm running on the GPU (a Radeon HD 2900). Very impressive!

bobvodka
12-23-2007, 03:43 PM
Yeah, the programmable tessellator does indeed have intresting potential (more so when combined with the other programmable components of the GPU), it's just a same no API is out there.

However, I do recall reading something about DX11 possibly requiring a programmable tessellator so in theory we'll get it at some point.