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SGI Developer Toolbox 6.1
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SGI Developer Toolbox 6.1 - Disc 1.iso
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toolbox
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src
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exampleCode
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opengl
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XLayerInfo
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README
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Developer toolbox: src/exampleCode/opengl/XLayerInfo
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.
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.
XLayerUtil.h/.c Sample code for routines to portably query overlay
visuals described in the prog_layers.ps article.
layerdemo.c Sample code demonstrating how to use pure-X overlay
windows to achieve transparency effects.
xlayerinfo.c Sample code for a program to list a server's visuals
including visual layering information.