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HP-UX Starbase Device Drivers Manual - Vol1: HP 9000 Series 700 Computers > Chapter 2 HP VMX Device Driver

HP VMX: The Overlay Plane Driver

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As mentioned in the section "HP VMX Device Driver, VM Rendering Utilities, and Overlay Planes," HP VMX serves as the Starbase driver for all CRX-family and HCRX-family overlay plane device opens. The "hardware device driver" for these devices (e.g. hpgcrx or hpcrx48z) is not supported in the overlay planes. HP VMX is used as the exclusive Starbase driver for the overlay planes on these devices.

If you gopen a window in the overlay planes of a CRX-family or HCRX-family device with a NULL driver parameter, the hpvmx driver will be selected. Alternatively, you may explicitly ask for the HP VMX driver by specifying hpvmx for the driver parameter to gopen.

Note that 8/8 double buffering is supported in the overlay planes using HP VMX.

Table 2-3 “Driver Selection at gopen” details driver selection for the CRX-family of devices at gopen time. Note, the driver selected is based on whether:

  • A window is in the image planes or overlay planes.

  • The hphcrx, hpgcrx, hpcrx48z, hpvmx, or NULL driver is specified.

Table 2-3 Driver Selection at gopen

Type of Window

Driver Specified

Window Depth

Driver Used

Image

hphcrx, hpgcrx, or hpcrx48z

8, 12, or 24

hphcrx, hpgcrx, or hpcrx48z

Image

hpvmx

8 12 and 24

hpvmx not supported

Image

NULL

8, 12, or 24

hphcrx, hpgcrx, or hpcrx48z

Overlay

hphcrx, hpgcrx, or hpcrx48z

8

not supported

Overlay

hpvmx

8

hpvmx

Overlay

NULL

8

hpvmx

 

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