Multisampled Antialiasing of Per-pixel Geometry

Abstract

Many algorithms exist which generate per-pixel geometry by selectively discarding fragments generated for a simple bounding geometry. On the other hand, multisampling support has become ubiquitous and is almost free in current graphics hardware. In this paper we leverage the ability of setting a pixel s coverage mask in the pixel shader to make seemingly inherently pixel-based per-pixel geometry approaches compatible with multisampled antialiasing. We consider both the rendering of curve regions as well as displacement mapping with antialiased outer and inner silhouettes.