Advanced

A Compressed Depth Cache

Hasselgren, Jon; Andersson, Magnus LU ; Nilsson, Jim and Akenine-Möller, Tomas LU (2012) In Journal of Graphics Techniques 1(1). p.101-118
Abstract
We propose a depth cache that keeps the depth data in compressed format, when possible. Compared to previous work, this requires a more flexible cache implementation, where a tile may occupy a variable number of cache lines depending on whether it can be compressed or not. The advantage of this is that the effective cache size increases proportionally to the compression ratio. We show that the depth-buffer bandwidth can be reduced, on average, by 17%, compared to a system compressing the data after the cache. Alternatively, and perhaps more interestingly, we show that pre-cache compression in all cases increases the effective cache size by a factor of two or more, compared to a post-cache compressor, at equal or higher performance.
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Graphics Techniques
volume
1
issue
1
pages
101 - 118
language
English
LU publication?
yes
id
85a5b1b6-54f4-45dc-9452-1ddfe40d0870 (old id 7759085)
alternative location
http://fileadmin.cs.lth.se/graphics/research/papers/2012/compresseddepth/
date added to LUP
2015-08-12 12:47:43
date last changed
2016-04-16 12:36:03
@article{85a5b1b6-54f4-45dc-9452-1ddfe40d0870,
  abstract     = {We propose a depth cache that keeps the depth data in compressed format, when possible. Compared to previous work, this requires a more flexible cache implementation, where a tile may occupy a variable number of cache lines depending on whether it can be compressed or not. The advantage of this is that the effective cache size increases proportionally to the compression ratio. We show that the depth-buffer bandwidth can be reduced, on average, by 17%, compared to a system compressing the data after the cache. Alternatively, and perhaps more interestingly, we show that pre-cache compression in all cases increases the effective cache size by a factor of two or more, compared to a post-cache compressor, at equal or higher performance.},
  author       = {Hasselgren, Jon and Andersson, Magnus and Nilsson, Jim and Akenine-Möller, Tomas},
  language     = {eng},
  number       = {1},
  pages        = {101--118},
  series       = {Journal of Graphics Techniques},
  title        = {A Compressed Depth Cache},
  volume       = {1},
  year         = {2012},
}