Download
TPage Calculator





This program was created to assist software developers on the Impact Graphics platform to better understand the texture-mapping subsystem and how their textures are managed.


Those who wish to use more than 1Mb/4Mb of image data can think of the TRAM chip(s) as a data cache. When you exceed the cache, the system will start to save data into host memory, which for some applications is highly undesirable.



To avoid this one should, if possible, define only as many texture objects whose combined sizes (in TRAM pages) will fit into the TRAMs. The question of TRAM usage by individual textures is a complicated one, and this program is offered as a helpful tool.





NOTES


Impact Graphics systems with hardware texturing (TRAMS) always have 256 pages. Using luminance textures will not allow you have a texture of 1024 pages, but it WILL allow you to have 4 256-page textures (via texture-object extension) simultaneously resident in the TRAMS. So the full characterization of space is #pages and #trams used.


In the breakdown scrollbox, if you see that a mipmapped texture with no border data chosen still uses some border pages, this is because the system requires some border pages for its own use. There's no way to avoid using these pages, as long as you are mipmapping.


In the breakdown scrollbox, if you see zero pages for either the image or the border, be assured that the data has been put into an already-existing page.



TRAM Calculator Software and C Version
Paul Hansen
hansen@engr.sgi.com
ISD Graphics
(415) 933-1514








Select any combo of files you'd like to send yourself a
compressed tar image of.  Executables/scripts are indicated
with a trailing `*' character.
(Depending upon the browser, it may be necessary to
hold down the Ctrl key to select/deselect
disjoint items.)


a compressed tar image of the above-selected items.


OR, ...


 a compressed tar 
image of the entire Utilities directory.





Copyright © 1996, Silicon Graphics, Inc.