Hi,
I'm making some tests on DGA 2 library in order to use it in the
future. But i've got some problems in understanding how it works.
First of all, i've understand that the function XDGASetViewport()
allow us to change the viewport in order to act as a flip function. So
to change the viewport i need an image size that is at least twice
larger than the screen size. For example if the video mode is 640x480, i
need an image of 1280x480 or of 640x960.
But in the list of the modes given by XDGAQueryModes() i can't have
such an image size. This means that i can't use XDGASetViewport in order
to do double buffering, doesn't it ?
Here a part of my XF86Config:
subsection "display"
depth 24
modes "1024x768" "800x600" "640x480"
endsubsection
In the list of modes, i can choose a mode where the image size is
1024x480 for a screen size of 640x480, but it's not enough !! I've got
an ATI Xpert 2000 pro with 32mo. So normaly, i can use video memory in
order to do double buffering.
Is DGA only able to use the video memory allocated by the Xserver so
here 1024x768 ??
I've got a another question, it's about the DGA blitting functions.
According to the flags given by DGA, i'm able to use the HW-blitting but
i've read in the src code of SDL that we can't blit on the memory area
where the screen is !! So if i can't use the XDGASetViewport i can't
use the XDGACopyArea() too !!
If somebody have examples of using DGA 2 or a good documentation (not
the README.DGA), i'm very interested !! Could you please send it to me
??
Sorry for my poor english and thanks for answering me.
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