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| author | Tom Cooksey <thomas.cooksey@nokia.com> | 2010-01-20 09:18:32 (GMT) |
|---|---|---|
| committer | Tom Cooksey <thomas.cooksey@nokia.com> | 2010-01-21 12:28:58 (GMT) |
| commit | 3a8236a01f89882d91e22a336f1e7134d3a84b68 (patch) | |
| tree | 0fffca58e99c76092ccedfaf36157d0a48b9f4c4 /doc/src/overviews.qdoc | |
| parent | 1729c2baea4e39f97d71b77f4c25af131f23221c (diff) | |
| download | Qt-3a8236a01f89882d91e22a336f1e7134d3a84b68.zip Qt-3a8236a01f89882d91e22a336f1e7134d3a84b68.tar.gz Qt-3a8236a01f89882d91e22a336f1e7134d3a84b68.tar.bz2 | |
Use an attribute value for the PMV matrix rather than a uniform
This has several advantages: First, updating an attribute value
seems to be cheaper than updating a uniform. Second, vertex atribute
values are independent of shader program, which means they persist
across changing of the shader program. This makes code simpler and
reduces GL state changes. Note: Credit goes to Samuel for finding
this little gem. :-)
For the 25920 solid QGraphicsRectItem test case, this gives 10%
improvement on desktop and 27% on the SGX.
Reviewed-By: Kim
Diffstat (limited to 'doc/src/overviews.qdoc')
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