questions about glDrawPixels

"张银霞" <[email protected]>
Newsgroups gmane.comp.video.mesa3d.user
Message-ID <[email protected]> 
Is it necessary to do glUseProgram(0) before use glDrawPixels?I found that if I just call glDrawPixels,Pixels I got are all about background color .but if i do glUseProgram(0) before glDrawPixels I will get correct pixels.

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