Technical data

16-Bit Luminance
11
The branch circuit wiring should be provided with an insulated grounding conductor
that is identical in size, insulation material, and thickness to the earthed and unearthed
branch-circuit supply conductors. The grounding conductor should be green, with or
without one or more yellow stripes. This grounding or earthing conductor should be
connected to earth at the service equipment or, if supplied by a separately derived
system, at the supply transformer or motor-generated set. The power receptacles in the
vicinity of the systems should all be of an earthing type, and the grounding or earthing
conductors serving these receptacles should be connected to earth at the service
equipment.
16-Bit Luminance
To access 16-bit luminance (high-resolution monochrome) using the DVP interface, the
application program must open a 16-bit luminance X-Windows visual. When this is
done, the DVP interface presents the 12 MSBs of luminance on the RED_OUT_{H,L}[11:0]
and (redundantly) on GREEN_OUT_{H,L}[11:0] bits. The 4 LSBs are contained on the
BLUE_OUT_{H,L}[3:0] bits. BLUE_OUT_{H,L}[11:4] contain another redundant copy of
the 8 MSBs of luminance. This provides access to 16-bit luminance without interfering
with the monochrome display of luminance on 8-bit-per-component analog video
channels, since all three color channels contain the 8 MSBs of luminance.
When considering applications of 16-bit luminance, remember that the InfiniteReality
implementation of OpenGL does not support 16-bit rendering such as lighting and
shading. However, 16-bit texturing is fully supported.
Video Format Programming
The DVP can accommodate custom video formats, if needed. InfiniteReality graphics
supports flexible, user-programmable video formats. As previously mentioned, the DVP
supports the full range of pixel clock rates available in the InfiniteReality graphics
subsystem. To load and run video formats on DVP, use the ircombine tool. For more
information about the Video Format Compiler and the ircombine tool, see the Video
Format Compiler Programming Manual (Silicon Graphics part number 007-3402-001), and
the IRcombine User Manual (Silicon Graphics part number 007-3279-001).
The DVP appears as another video channel in the ircombine tool’s user interface. Use
of the DVP does not disable any other video channel. However, the rules for combining
video formats to run on multiple channels (e.g., total memory and video bandwidth