Mailinglist Archive: radeonhd (307 mails)

[Alex Deucher <alexdeucher@xxxxxxxxx>]

On Mon, Feb 9, 2009 at 4:46 PM, Mark van Doesburg
<mark.vandoesburg@xxxxxxxxx> wrote:
> Hi,
>
> I am reading the code for the driver, just to get some idea how this
> thing works. But I have a question about the r600_exa.c copy code. This
> function uses the DI_PT_RECTLIST primitive. I don't think I understand
> how the overlapping copy code works. I think that if you can't alter
> the direction in which the address is incremented you would need an
> additional buffer to make this work correctly.

The current code works breaking the overlapping region down into
regions the size of the non-overlapping part and copying them over one
by one.  That way you never have to worry about raster direction since
you are always copying a non-overlapping part.

> The register documentation gives another primitive type called
> DI_PT_2D_COPY_RECT_LIST_V[0-3]. Obviously I have no idea what this does,
> but I can guess that these four primitives are copy functions using four
> different incrementing orders.
>
> Maybe someone with the documentation can answer this question?

Those primitives were designed for that purpose, but they don't work
like the other primitives.  The VGT and vertex setup setup is
completely different.  They were implemented for the 2D emulation in
the CP microcode on r6xx chips.  They aren't really supposed to be
usable by software according to the hw folks.

Alex
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