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HP-UX Starbase Device Drivers Manual - Vol1: HP 9000 Series 700 Computers > Chapter 2 HP VMX Device Driver
HP VMX Device Driver, VM Rendering Utilities, and Overlay Planes |
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Before going further, we must clarify some points related to HP VMX. In order to do so, you need to understand the two basic functions that HP VMX provides:
Together, these two functions create what we call "HP VMX". There also exists, as a matter of implementation, a set of internal graphics system functions which rely on VM rendering, but not on the display of the VM buffer in a window. This set of functions is called the VM Rendering Utilities and includes:
Again, these utilities are not included in the definition of "HP VMX" but do rely on some of the same internal implementation. The majority of this chapter will discuss HP VMX as a "device driver" and is organized in a manner similar to the other device driver chapters. The "VM Rendering Utilities" section near the end of the chapter discusses in more detail each of the VM rendering utilities and explains some of the implementation details. HP VMX serves as the Starbase driver for all CRX-family and HCRX-family "overlay plane" device opens. Note, that the "hardware device driver" (for example, hpgcrx or hpcrx48z) is not supported in the overlay planes on these devices. HP VMX is used as the exclusive Starbase driver for the overlay planes on these devices. Please see the section "HP VMX: The Overlay Plane Driver" for details on how HP VMX is used in this capacity. |
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