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FAQ MultiScreen

Japanese

SpanMode vs. DualView

On Windows XP graphic card drivers offer two different modes to use multiple monitors on 1 card:

  • SpanMode treats multiple monitors together as one DirectX device.
  • DualView treats each monitor as a single DirectX device.

A current limitation of Videotexture (EX9.Texture) and VideoTexture (EX9.Texture YUVMixing) is that they can only playback on one DirectX device at a time. Meaning that in DualView you can see them only on one monitor.

SpanMode (only available on Windows XP)

  • Multiple monitors together form one DirectX device
  • Renderers always go fullscreen spanning over all the outputs of the graphic card

In this mode you can play videotextures on multiple monitors, but you can't go fullscreen on only one of the monitors and have the patches on the other. SpanMode always only works on one graphiccard, the desktop cannot be spanned via several graphiccards.

DualView

  • A DirectX device is created for each ouptut on the graphic card
  • Renderers go fullscreen on individual outputs independently

In this mode a videotexture plays only on one of the outputs at a time and you can go fullscreen with a renderer on one monitor while still patching on the other.

Mosaic Mode in Windows 7 with Nvida Graphic Cards

You can use Span Mode in Windows 7 by simply going in the Nvida Control Pannel and setting it up. There it is called Mosaic-Mode.

You can also download configureMosaic.exe from the Nvdia page and use the following commandline parameters to activate it:

    > cd c:\Path\
    > configureMosaic.exe set rows=1 cols=3 overlap=0,0 res=1920,1080,60

This might be handy if you want vvvv or a startup script to set up the span mode.

Overcomming the VideoTexture limitations

Option 1

Use two filestreams and two videotextures where each is connected to one of the renderers to see video on both renderers/devices but they'll probably not be in sync and you risk bad performance.

Option 2

Use VideoIn/FileStream->sharedmem->videotexture->quad
for one device. and then use sharedmemtexture->quad for the other devices.

ggml said
21.11.08 23:19:
videoin across shared memory works streched on 3 videocards pretty well. if anyone interested, i can report precise performance and system information.

Expanding Windows' SpanMode

  • Graphics expansion modules are small black boxes that let you connect two or three monitors to a single VGA, DVI or DisplayPort output and use your system's GPU across all monitors. Via a custom EDID they make your PC believe that only one monitor with a resolution of e.g. 3072*768 Pixel is connected. Well known products are Matrox DualHead2Go and Matrox TripleHead2Go
  • AMD EyeFinity Technology a.k.a. Evergreen supports multiple display outputs simultaneously as one large SpanMode. Used in ASUS' graphic card line 'Radeon' EyeFinity enables massive desktop workspaces, e.g. you can connect 6 monitors with each FullHD resolution to the graphic card and then go fullscreen with only one DirectX renderer.

Links

related vvvviki-pages

related vvvvorum-threads

anonymous user login

Shoutbox

~3d ago

cznickesz: @tonfilm thanks for the info. Can´t wait to give it a try!

~4d ago

tonfilm: @cznickesz #vvvv #vl #xenko integration is not ready for the public yet, it's still under heavy development... more updates soon.

~4d ago

cznickesz: Possibly dumb question: is there any release containing xenko-integration right now?

~5d ago

~5d ago

~6d ago

joreg: looking for latest #vvvv gamma preview? it is here: vvvv-gamma-2019.1-preview

~7d ago

udo2013: I just want to know why the camera does not work. should be easy to be answered.

~7d ago

udo2013: an answer, please. also there was a 4d julia set in dx9. that must have programmed one. haalllooo!!

~7d ago

udo2013: where are the people who have translated shadertoy's mandelbulb in hlsl ?? for vvvv