Support; Radeon 7500 Tcl Support; Threads Restriction; No Backing Store/Save Unders For 3D Windows - ATI Technologies 100-432001 - RADEON 7500 Multi-monitor Graphics Card Installation Manual

4.6 3D Support
To get the most out of your RADEON 7500 graphic controller, you must have an Open3D
license to use the 3D hardware-acceleration (direct rendering) features supported by this
product.
The ATI RADEON 7500 Graphics Support kit supports the 3D graphics library OpenGL
V1.2 and GLX V1.2. Among other features, the kit contains support for the ATI RADEON
7500 TCL hardware, hardware alpha and stencil planes, 3D multitexturing, and 3D cube
map textures.
If you have an Open3D license, OpenGL software for RADEON 7500 will, by default, force
a direct-rendered OpenGL rendering context whenever the OpenGL client requests
connection to the DECwindows server using the LOCAL transport.
You can override this default behavior and force the default to always be indirect rendering
by defining the following logical name before running the 3D application:
$ DEFINE LIBGL_ALWAYS_INDIRECT 1
4.6.1

RADEON 7500 TCL Support

The OpenGL driver for the RADEON 7500 contains support for the on-board
transformation, clipping, and lighting (TCL) hardware of the RADEON 7500 for increased
primitive rendering performance. You can take advantage of these capabilities if you have
an Open3D license.
4.6.2

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.
4.6.3

No Backing Store/Save Unders for 3D Windows

Backing store and save under features are not supported when 3D is enabled.
hp OpenVMS Alpha - Graphics Software Installation and Customization 4-7