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- Developer toolbox: src/exampleCode/opengl/XLayerInfo
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- This is an OpenGL implementation of the straight-Xlib version included
- in src/exampleCode/X/Xservers/{xlayerinfo && layerdemo} which
- accompanied the prog_layers.ps article. Quoting from that dir's README:
-
- prog_layers.ps PostScript for an article titled "Programming X
- Overlay Windows" explaining how to use SGI's
- SERVER_OVERLAY_VISUALS convention to portably create
- X windows in the overlay planes.
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- ABSTRACT: Overlay planes provide an alternate set of
- frame buffer bitplanes which can be preferentially
- displayed instead of the normal set of bitplanes.
- Overlay planes have been common in high-end graphics
- systems for some time. Recently, work has been done
- by Silicon Graphics to integrate overlay plane support
- into the X Window System. A standard convention
- proposed and implemented by Silicon Graphics allows X
- client writers to create windows in the overlay planes.
- This article describes how to write programs to utilize
- overlay planes.
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- XLayerUtil.h/.c Sample code for routines to portably query overlay
- visuals described in the prog_layers.ps article.
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- layerdemo.c Sample code demonstrating how to use pure-X overlay
- windows to achieve transparency effects.
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- xlayerinfo.c Sample code for a program to list a server's visuals
- including visual layering information.
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