Compressed Multisampling for Efficient Hardware Edge Antialiasing
and Pierre Poulin
Proc. Graphics Interface 2004, May 2004
Today's hardware graphics accelerators incorporate
techniques to antialias edges and minimize geometry-related sampling
artifacts. Two such techniques, brute force supersampling and
multisampling, increase the sampling rate by rasterizing the
triangles in a larger antialiasing buffer that is then filtered down
to the size of the framebuffer. The sampling rate is proportional to
the number of subsamples in the antialiasing buffer and, when no
compression is used, to the memory it occupies. In turn, a larger
antialiasing buffer implies an increase in bandwidth, one of the
limiting resources for today's applications. In this paper we
propose a mechanism to compress the antialiasing buffer and limit
the bandwidth requirements while maintaining higher sampling rates.
The usual framebuffer-related functions of OpenGL are supported:
alpha blending, stenciling, color operations, and color masking. The
technique is scalable, allowing for user-specified maximal and
minimal sampling rates. The compression scheme includes a mechanism
to nicely degrade the quality when too much information would be
required. A lower bound on the quality of the resulting image is
also available since the sampling rate will never be less than the
user-specified minimal rate. The compression scheme is simple enough
to be incorporated into standard hardware graphics accelerators.
Software simulations show that, for a given bandwidth, our technique
offers improved visual results over multisampling schemes.
Graphics hardware, edge antialiasing, multisampling.
title = "Compressed Multisampling for Efficient Hardware Edge Antialiasing",
author = "Philippe Beaudoin and Pierre Poulin",
booktitle = "Graphics Interface 2004",
year = "2004",
month = "May",
pages = "169-176"
Adobe PDF version of the paper