Dan Brockway (db++at++ParadigmSim.com)
Fri, 06 Jun 1997 10:27:05 -0500
You have a texel internal format problem.
Look at the MultiGen .attr file associated with each texture (or at the
.ct file, if using clip texture). This will show you the internal format
being used.
>From MultiGen Series II, in the Texture Palette, with a texture
selected; pull down "Edit" then "Modify Attributes". Now correlate the
"Internal Format" value with the list in the man page for PfTexture.
This will show you the number of bits being used in texture memory.
You will notice that all of the formats are 16 bits or larger. Bummer.
It is possible, with a little code, to use a GL color table lookup which
is 8 bits, but I don't know how many bits get allocated in testure
memory.
Dan
Thom DeCarlo wrote:
>
> (Isn't it always the case - that immediately after hitting the send
> button you see another key detail that needed to go in the message.)
>
> I just loaded one of my terrain blocks using perfly. It shows the
> texture processing info as follows:
>
> PF Info: pfuDownloadTexList texture processing
> PF Info: Initialized 1 Channel
> PF
> PF Notice: Using 60Hz video rate.
> PF Loading texture:
> PF File name = .../cib.int
> PF Image size (SxTxR) = 2048x2048x1
> PF Download size = 16777216 bytes
> PF Download time =1314.261 ms
> PF Download rate = 12.174 MB/sec
> PF Total texture use = 16.000 MB
> PF This texture uses = 100.000% of 16MB memory
> PF Total texture use = 100.000% of 16MB memory
> PF Download totals
> PF Textures: 1
> PF Elapsed time: 1.318 sec
> PF
>
> So now the question becomes, why is a 4MB image file taking up 16MB of
> texture memory? Is it because my grayscale image is being duplicated in
> the red, green, blue, and alpha bands? If so, I guess cutting it down in
> smaller chunks will help.
>
> Thom
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-- Dan Brockway voice: (972) 960-2301 Paradigm Simulation Inc. fax: (972) 960-2303 14900 Landmark Blvd., Suite 400 mailto:db++at++ParadigmSim.com Dallas TX 75240 http://www.ParadigmSim.com======================================================================= List Archives, FAQ, FTP: http://www.sgi.com/Technology/Performer/ Submissions: info-performer++at++sgi.com Admin. requests: info-performer-request++at++sgi.com SGI DevForum 97 info: http://www.sgi.com/Forum97/
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