Re: [Chromium-dev] readback + tilesort

[Johann W. <jh...@st...>]

Hi,

Putting readback + tilesort aside, I'm testing binaryswap + tilesort
configuration.

With the patch, the problem mentioned earlier has been (partially) resolved.
However this time, similar symtpom is found with bswap + tilesort.
The same portion is drawn on each of the tiles ( I applied the patch ).

Attached .conf is a modified version of psubmit_bswap, which uses two tiles.
Please test with it, and give me a comment.

Thanks in advance,

- johann.


Quoting Brian Paul <bri...@tu...>:

> Joong Ho (Johann) Won wrote:
> > Hi,
> > 
> > I'm testing a combination of readback and tilesort SPUs, of which the
> > ultimate purpose is to let sort-last parallel apps be able to render on
> a
> > DMX mural display. I wrote a simple test script for the first step,
> which is
> > a very simple modification of simplemural.conf.
> > Simplemural.conf uses a tilesort SPU to render an app in two seperate
> > (possibly remote) windows.
> > My intension is just to add a readback SPU on top of the tilesort SPU.
> At
> > this stage, it has nothing to do with DMX.
> > 
> > What should be rendered must be the same as that of the original
> > simplemural.conf, but it is not.
> > SAME part of the application window is rendered on both of the
> crserver
> > windows, i.e. the left half.
> > 
> > Configuration for readback is the simplest, as will be shown below.
> > Mike Houston's guess is that there may be a bug in arguments for
> DrawPixels.
> > Even worse is that when the 'extract_depth' option is turned on,
> nothing is
> > drawn at all.
> > 
> > Below is my modified simplemural.conf script. Only a few lines related
> with
> > readbackSPU are added and without these, everything works fine.
> > 
> > Thanks in advance for any comment.
> 
> I found the problem.  On the server side, the initial current raster 
> position needs to be translated by the origin of the server's tile. 
> Normally, the first call to glRasterPos/glWindowPos would set it 
> correctly, but the tilesort SPU's state tracker was filtering out that 
> state change.
> 
> Try applying this patch to crserverlib/server_context.c
> 
> -Brian
> 
>