3DLABS Oxygen GVX210 - Manual (Page 25)

Software Configuration
3Dlabs Oxygen GVX210 User's Guide 15
OpenGL Support Screen
This screen controls OpenGL-application-specific driver settings and enables you to create your own settings.
When the panel initially appears the New and Remove Settings buttons, as well as the Advanced Options
section, are hidden. They appear when you click the Advanced button at the top of the screen.
Click Driver is optimized for application to reach a drop down list of applications, then select the one
you want to use. The rest of your actions on this screen will apply to that choice. You can also click
Select optimized application in the Configuration Manager and select your application from that pop-
up list.
Click New to add an application to the list and customize its settings. Remove Setting will remove a
user created setting, but will not remove default settings created at driver installation time.
Number of DMA Buffers lets you configure the number of visible 3D windows that can be supported
with full speed acceleration. For most applications, 8 buffers are sufficient.
Size of each DMA buffer controls the size (in bytes) of the Direct Memory Access (DMA) buffer.
DMA is a technique whereby a device can directly read commands from host memory.
Number of DMA Sub-Buffers lets you set the number of Direct Memory Access (DMA) buffers
allocated for use by OpenGL. (DMA is a technique whereby a device can directly access memory
without having to go through the CPU). Each DMA buffer is sub-divided into sub buffers that are
used in conjunction with a queued DMA mechanism to reduce latency in the system. The number of
sub buffers can be set. Setting it to 2 will disable the queued DMA mechanism.
Overlay / Alpha Mode provides additional control of the overlay plane capabilities exported in the
OpenGL pixel formats. It is specific to just two applications: Alpha Only is required by the Alias /
Wavefront application “Maya” where retained alpha planes are required (e.g. the particle system
package), and Overlay Only is for the Parametric Technology application “Pro/3DPaint”. Selection of
the above applications from the application menu cause the correct mode to be set automatically. The
Dynamic setting should be chosen for all other cases.