overview of OpenGL
environment variables
Chapter 124
environment variables
Here is a list of environment variables used by HP’s implementation of
OpenGL.
HPOGL_ALLOW_LOCAL_INDIRECT_CONTEXTS
This variable may be set if a need arises to really create a local indirect
context. By default, if an indirect context is requested for a local HP
display connection, a direct context will be created instead because the
performance will be much better.
HPOGL_ENABLE_MIT_SHMEM
When rendering locally using the VM Driver, this variable allows the
server and client to look at the rendering buffer at the same time. This
variable has no effect through DHA. It merely eliminates the data
transfer for XPutImage() that is done by VMD. This only offers a
performance improvement on simple wireframes. Under most
circumstances, it does not provide any performance improvements.
HPOGL_FORCE_VGL
This variable can be set to force HP’s Virtual GL (VGL) rendering mode
using VMD. This differs from HPOGL_FORCE_VMD in that the GLX
Visual list and other GLX extension information is not retrieved from the
GLX Server extension, but is rather synthesized from standard X Visual
information and the capabilities known to exist in VMD.
HPOGL_FORCE_VMD
This variable forces clients to render through the VMD. This variable can
be used as a temporary fix and/or a diagnostic. You should set this
variable when a rendering defect in the hardware device driver is
suspected. When this variable is set, rendering speed will slow down. If
rendering is identical in both hardware and software, then this may
indicate a problem in the application code.
HPOGL_LIB_PATH
This variable can be used to load OpenGL driver libraries from a
directory outside the standard LIB_PATH. This variable should be set to
the actual directory the libraries are in, with or without a trailing’/’.
HPOGL_LIGHTING_SPACE (HP Visualize fx family only)
OGLImp.book Page 24 Tuesday, February 14, 2006 9:15 AM
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