NV_path_rendering
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This document provides an overview of GPU-accelerated path rendering using the NV_path_rendering API. It introduces path rendering as a resolution-independent 2D graphics technique where rendering order determines occlusion and transparency. The API uses a "stencil, then cover" approach to render paths specified as sequences of commands like lines and curves. Examples are given of common path operations like filtering, projective rendering, and clipping that the API supports. Benchmark scenes and resources for learning the API are also outlined. Feedback is welcomed to improve the new path rendering functionality.
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- 1. An Introduction to NV_path_rendering Mark J. Kilgard NVIDIA Corporation June 8, 2011
- 2. Purpose of this Presentation Overview of GPU-accelerated path rendering Using “stencil, then cover” Explain and demonstrate the NV_path_rendering API Aimed primarily at programmers Introduce you to the content of NVIDIA’s NVpr SDK
- 3. What is path rendering? A rendering approach Resolution-independent two- dimensional graphics Occlusion & transparency depend on rendering order So called “Painter’s Algorithm” Basic primitive is a path to be filled or stroked Path is a sequence of path commands Commands are – moveto, lineto, curveto, arcto, closepath, etc. Standards Content: PostScript, PDF, TrueType fonts, Flash, Scalable Vector Graphics (SVG), HTML5 Canvas, Silverlight, Office drawings APIs: Apple Quartz 2D, Khronos OpenVG, Microsoft Direct2D, Cairo, Skia, Qt::QPainter, Anti-grain Graphics,
- 4. Path Filling vs. Stroking just filling just stroking filling + stroke = intended content
- 5. Handling Common Path Rendering Functionality: Filtering GPUs are highly efficient at image filtering Fast texture mapping Qt Mipmapping Anisotropic filtering Wrap modes CPUs aren't really Moiré artifacts GPU Cairo
- 6. Projective Path Rendering Support Compared GPU Skia Cairo Qt flawless yes, but bugs unsupported unsupported correct correct unsupported unsupported correct wrong unsupported unsupported
- 7. Rendering Paths Clipped to Some Other Arbitrary Path Example clipping the PostScript tiger to a heart constructed from two cubic Bezier curves unclipped tiger tiger with pink background clipped to heart
- 8. Benchmark Scenes Tiger Dragon Round Dogs Butterfly Spikes Coat of Arms Cowboy Buonaparte Embrace Japanese Strokes
- 9. Learning NV_path_rendering White paper + source code available “Getting Started with NV_path_rendering” Explains Path specification “Stencil, then Cover” API usage Instanced rendering for text and glyphs
- 10. Feedback and Contacts We need your feedback Issues? Questions? Contact us by emailing nvpr-support@nvidia.com