Re: Virtual Graphics Adapter driver support for reverse resolution.

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Hi,

Thanks Ben.

Yes 640 * 960 worked and so do 768 * 1024. But the reason for this is
that resolution of 960 * 640 and 1024 * 768 are supported by the ATI
graphics adapter.

Thus, the inference which I drew from my R&D is that , if a perticular
mode is supported by the ATI graphics card like (1024 * 768, 960 * 640)
, then its reverse resoluiton is also supported by the it(768 * 1024 ,
640 * 960), and thus these resolutions can also be supported by my
virutal graphics adapter driver.

But my point is , why this dependency is there on of my virtual
graphics adapter driver on the the main ATI graphics adapter.. Mine is
an independent virutal graphics adapter driver , that should be able to
support any resolution. Why then it fails to support 480 * 800 or 123 *
456.

In DrvGetmodes I am filling the DEVMODEW structure with both the
resolutions 800 * 480 and 480 * 800. While 800 * 480 gets supported ,
480 * 800 doesnt.

I want to support the resolution of 480 * 800 in my virtual graphics
adapter driver . Please help.

Thanks

Ben Voigt wrote:
"anshul makkar" <anshulmakkar@xxxxxxxxx> wrote in message
news:1156861206.151937.284150@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Hi,

I have written a virtual graphics adapter driver that consists of -:

- > miniport driver that does nothing except from returning true or
false

- > display driver is just a skeleton driver that pass all the call to
it to DIB engine through eng calls.

Display driver dll has been written to support the standard resolution
of 800 * 600 . It works well for my extended graphics monitor.

But I want my graphics driver to support the reverse resolution mode of
480 * 800.When in DrvGetmodes i give the resolution as 480 * 800 and
then when I load the graphics driver , the error message flashes that
"this driver has been written for older version of windows..." and the
driver does not get loaded..

Then I tried my graphics driver with ATI card that supports some of
the reverse resolutions. eg 800 * 1200 etc.
So in my graphics drivers DrvGetModes I gave the resolution as 800 *
1200 , and then loaded the graphcis driver.

Please note that 800x1200 is a standard resolution, i.e. 800x600 dual
monitor. 480x800 is not. Can you just use part of a larger resolution,
like 640x960?


To my surprise the driver got loaded properly.

Now , I fail to understand why this dependency of my virtual graphics
adapter driver is there on the main ATI graphics adapter.

If this dependency is there , then I can only support resolution that
are supported by the ATI card ?

I want to support resolution of 480 * 800 in my virtual graphics
adapter. If anyone has any idea then please share it .


.

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