NDLI: Decoupled coverage anti-aliasing

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Decoupled coverage anti-aliasing

Content Provider	ACM Digital Library
Author	Wang, Yuxiang Sen, Pradeep He, Yong Wyman, Chris
Abstract	State-of-the-art methods for geometric anti-aliasing in real-time rendering are based on Multi-Sample Anti-Aliasing (MSAA), which samples visibility more than shading to reduce the number of expensive shading calculations. However, for high-quality results the number of visibility samples needs to be large (e.g., 64 samples/pixel), which requires significant memory because visibility samples are usually 24-bit depth values. In this paper, we present Decoupled Coverage Anti-Aliasing (DCAA), which improves upon MSAA by further decoupling coverage from visibility for high-quality geometric anti-aliasing. Our work is based on the previously-explored idea that all fragments at a pixel can be consolidated into a small set of visible surfaces. Although in the past this was only used to reduce the memory footprint of the G-Buffer for deferred shading with MSAA, we leverage this idea to represent each consolidated surface with a 64-bit binary mask for coverage and a single decoupled depth value, thus significantly reducing the overhead for high-quality anti-aliasing. To do this, we introduce new surface merging heuristics and resolve mechanisms to manage the decoupled depth and coverage samples. Our prototype implementation runs in real-time on current graphics hardware, and results in a significant reduction in geometric aliasing with less memory overhead than 8×MSAA for several complex scenes.
Starting Page	33
Ending Page	42
Page Count	10
File Format	PDF ZIP
ISBN	9781450337076
DOI	10.1145/2790060.2790068
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2015-08-07
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Real-time rendering Anti-aliasing Graphics hardware
Content Type	Text
Resource Type	Article

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