nvidia: how to use overlay

nvidia: how to use overlay

[feedback]

gongpu (gongp03@hotmail.com) has submitted this feedback
for nvidia

In my project which I\'m working on, I want to display two layer. One is for some video information. The other is for some symbols. I know how to use frame buffer to write directly to the video ram. But how to implement these two layers? 
SDL sdk gives some overlay functions, but I think it was implemented in software. How to use hardware overlay?
Of course, I\'m sure that my video card surpport this kind of overlay. 
I\'ll be very appreciated if you can tell me how to do it or where I can find relative information. Thanks for reading. Waiting for your answer.


-------------------------------------------------------
This SF.Net email is sponsored by: IntelliVIEW -- Interactive Reporting
Tool for open source databases. Create drag-&-drop reports. Save time
by over 75%! Publish reports on the web. Export to DOC, XLS, RTF, etc.
Download a FREE copy at http://www.intelliview.com/go/osdn_nl

Re: nvidia: how to use overlay

[Antonino A. Daplas]

On Thursday 20 January 2005 20:18, feedback@linux-fbdev.sourceforge.net wrote:
> gongpu (gongp03@hotmail.com) has submitted this feedback
> for nvidia
>
> In my project which I\'m working on, I want to display two layer. One is
> for some video information. The other is for some symbols. I know how to
> use frame buffer to write directly to the video ram. But how to implement
> these two layers? SDL sdk gives some overlay functions, but I think it was
> implemented in software. How to use hardware overlay? Of course, I\'m sure
> that my video card surpport this kind of overlay. I\'ll be very appreciated
> if you can tell me how to do it or where I can find relative information.
> Thanks for reading. Waiting for your answer.

Try DirectFB (www.directfb.org).  They have an nvidia driver that supports
multiple layers (usually primary + overlay).  You can use SDL on DirectFB by
the way.

Note: I don't know the status of the DirectFB nvidia driver, but it seems
there is a flurry of development recently.

Tony




-------------------------------------------------------
This SF.Net email is sponsored by: IntelliVIEW -- Interactive Reporting
Tool for open source databases. Create drag-&-drop reports. Save time
by over 75%! Publish reports on the web. Export to DOC, XLS, RTF, etc.
Download a FREE copy at http://www.intelliview.com/go/osdn_nl