NDLI: Multi-fragment effects on the GPU using the k-buffer

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Multi-fragment effects on the GPU using the k-buffer

Content Provider	ACM Digital Library
Author	Silva, Cláudio T. Bavoil, Louis Lefohn, Aaron Callahan, Steven P. Comba, João L. D.
Abstract	Many interactive rendering algorithms require operations on multiple fragments (i.e., ray intersections) at the same pixel location: however, current Graphics Processing Units (GPUs) capture only a single fragment per pixel. Example effects include transparency, translucency, constructive solid geometry, depth-of-field, direct volume rendering, and isosurface visualization. With current GPUs, programmers implement these effects using multiple passes over the scene geometry, often substantially limiting performance. This paper introduces a generalization of the Z-buffer, called the k-buffer, that makes it possible to efficiently implement such algorithms with only a single geometry pass, yet requires only a small, fixed amount of additional memory. The k-buffer uses framebuffer memory as a read-modify-write (RMW) pool of k entries whose use is programmatically defined by a small k-buffer program. We present two proposals for adding k-buffer support to future GPUs and demonstrate numerous multiple-fragment, single-pass graphics algorithms running on both a software-simulated k-buffer and a k-buffer implemented with current GPUs. The goal of this work is to demonstrate the large number of graphics algorithms that the k-buffer enables and that the efficiency is superior to current multipass approaches.
Starting Page	97
Ending Page	104
Page Count	8
File Format	PDF
ISBN	9781595936288
DOI	10.1145/1230100.1230117
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2007-04-30
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Fragment processing Transparency Blending Graphics hardware Visibility ordering Csg Volume rendering
Content Type	Text
Resource Type	Article

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