Explicit Cache Management for Volume Ray-Casting on Parallel Architectures

Jönsson, Daniel; Ganestam, Per; Doggett, Michael; Ynnerman, Anders; Ropinski, Timo

Explicit Cache Management for Volume Ray-Casting on Parallel Architectures

Files

031-040.pdf (466.39 KB)

Date

2012

Authors

Jönsson, Daniel
Ganestam, Per
Doggett, Michael
Ynnerman, Anders
Ropinski, Timo

Publisher

The Eurographics Association

Abstract

A major challenge when designing general purpose graphics hardware is to allow efficient access to texture data. Although different rendering paradigms vary with respect to their data access patterns, there is no flexibility when it comes to data caching provided by the graphics architecture. In this paper we focus on volume ray-casting, and show the benefits of algorithm-aware data caching. Our Marching Caches method exploits inter-ray coherence and thus utilizes the memory layout of the highly parallel processors by allowing them to share data through a cache which marches along with the ray front. By exploiting Marching Caches we can apply higher-order reconstruction and enhancement filters to generate more accurate and enriched renderings with an improved rendering performance. We have tested our Marching Caches with seven different filters, e. g., Catmul-Rom, Bspline, ambient occlusion projection, and could show that a speed up of four times can be achieved compared to using the caching implicitly provided by the graphics hardware, and that the memory bandwidth to global memory can be reduced by orders of magnitude. Throughout the paper, we will introduce the Marching Cache concept, provide implementation details and discuss the performance and memory bandwidth impact when using different filters.

        @inproceedings{:10.2312/EGPGV/EGPGV12/031-040
,
booktitle = {Eurographics Symposium on Parallel Graphics and Visualization
},
editor = {Hank Childs and Torsten Kuhlen and Fabio Marton
},
title = {{Explicit Cache Management for Volume Ray-Casting on Parallel Architectures
}},
author = {Jönsson, Daniel and 
Ganestam, Per and 
Doggett, Michael and 
Ynnerman, Anders and 
Ropinski, Timo
},
year = {2012
},
publisher = {The Eurographics Association
},
ISSN = {1727-348X
},
ISBN = {978-3-905674-35-4
},
DOI = {/10.2312/EGPGV/EGPGV12/031-040
}
}