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glsl: Comment that expression flattening is used for matrix operations.

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Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net>
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Kenneth Graunke 2012-03-13 11:42:26 -07:00
parent 7f6af49092
commit ced54dcf9b
1 changed files with 4 additions and 1 deletions
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5
src/glsl/ir_expression_flattening.cpp
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@ -27,7 +27,10 @@
* Takes the leaves of expression trees and makes them dereferences of
* assignments of the leaves to temporaries, according to a predicate.
*
* This is used for automatic function inlining, where we want to take
* This is used for breaking down matrix operations, where it's easier to
* create a temporary and work on each of its vector components individually.
*
* It is also used for automatic function inlining, where we want to take
* an expression containing a call and move the call out to its own
* assignment so that we can inline it at the appropriate place in the
* instruction stream.