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Hardware Release Notes
6.10 ATI RADEON 7500 Graphics
6.10.12 Pixel Depth for Read/Write Color Map
By default, the RADEON 7500 provides a pixel depth of 24 planes with a read-
only, TrueColor color map. Some applications, such as DECwindows Paint,
require a read/write color map. If Paint is run with a read-only color map, it fails
with the following error message:
Error: Visual Not Supported
Supported Visuals are {PseudoColor, GrayScale, StaticGray}
To use a read/write color map, edit the file SYS$MANAGER:DECW$PRIVATE_
SERVER_SETUP.COM (or, if this file does not exist, create it from
SYS$MANAGER:DECW$PRIVATE_SERVER_SETUP.TEMPLATE) and add
the following logical name definition to the file:
$ DEFINE/EXECUTIVE/SYSTEM/NOLOG DECW$SERVER_PIXEL_DEPTH 8,8,8,8,8,8,8,8
Then restart DECwindows using the following command:
$ @SYS$MANAGER:DECW$STARTUP RESTART
This change sets the pixel depth to 8 planes (on up to 8 graphics cards, which
allows for a multiple-card configuration) and allows the server to provide a
PseudoColor visual.
6.10.13 Backing Store/Save Unders Not Supported for 3D Windows
The implementation of backing store and save unders in the RADEON 7500 X11
server does not support 3D windows.
6.10.14 Threads Restriction
The RADEON 7500 OpenGL library for OpenVMS is not thread safe. However,
OpenGL can be used in a multithreaded program if the use of OpenGL is
restricted to a single thread within the program.
6.10.15 No Support for Single Buffered Visuals
The RADEON 7500 DECwindows server exports only double buffered visuals.
For single buffering, users must select a double buffered visual and call
glDrawBuffer( GL_FRONT )
in their application.
6.10.16 No 3D Support for Color Index Mode
Even though 8-bit visuals are supported for 2D operations when the DECwindows
server is started with bit depth = 8, OpenGL rendering is not supported on 8-bit
visuals.
6.10.17 Timer Mechanism
Under certain circumstances, it is possible for a process to be interrupted while it
owns the hardware lock, resulting in an apparent DECwindows server hang.
A timer mechanism has been implemented to detect this situation and to rectify
it by forcing an image exit in the suspended process — or, in some instances, by
deleting the process.
The timer mechanism can be configured using the following two logicals, which
should be specified in the DECW$PRIVATE_SERVER_SETUP.COM file:
• DECW$DRM_TIMER_PERIOD (Default: 5.0 seconds)
Specifies the duration of the clock tick in seconds; a floating-point value.
• DECW$DRM_TIMEOUT (Default: 6)
6–12 Hardware Release Notes