vincentlj f338fbacb1 SSAO: Use a proper rand() function to generate fragment local coordinate system.
This new level of randomness get rid of most banding effect, SSAO now looks quite good.

git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@15072 178a84e3-b1eb-0310-8ba1-8eac791a3b58
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