HP c8000 Workstation Guia do Utilizador descarregar pdf (Página 22)

configuring X Windows on HP-UX (HP Visualize graphics cards)

X Server configuration

Chapter 220

Screen /dev/crt0

SingleLogicalScreen 1 2

/dev/crt1 /dev/crt2

Figure 2-7 Three physical displays, screen plus single logical screen(1x2)

miscellaneous topics

double buffer extensions

DBE is an extension to the X Server that provides a double-buffering

Application Programming Interface (API). For more information about

DBE and the API, consult the DBE man pages:

DBE

XdbeQueryExtension

XdbeGetVisualInfo

XdbeFreeVisualInfo

XdbeAllocateBackBufferName

XdbeDeallocateBackBufferName

XdbeSwapBuffers

XdbeBeginIdiom

XdbeEndIdiom

XdbeGetBackBufferAttributes

performing buffer swaps on vertical blank

For performance reasons, the default DBE behavior is to not synchronize

buffer swaps with the monitor’s vertical retrace period. In some

instances, therefore, image tearing (seeing part of the old image and part

of the new image on the display at the same time) could be visible while

swapping large DBE windows. For those instances where tearing would

occur and is undesirable, an optional X Server mode is available to allow

for synchronization of buffer swaps with vertical retrace. To activate this

optional X Server mode, set the following screen option in the X*screens

File before the X Server is started:

SwapBuffersOnVBlank

host

>:0.0

/dev/crt0

/dev/crt1

/dev/crt2

host

>:0.0

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HP c8000 Workstation Guia do Utilizador Página 22