Can't disable and re-enable MULTISAMPLE mode

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Laurent Ach (ach++at++anna.reality)
Thu, 27 Jun 1996 19:35:00 -0600

Hello,

I called glDisable(GL_MULTISAMPLE_SGIS) in the draw process in a Performer 2.0
/ OpenGL application on a RE2, in order to draw faster a background image using
glDrawPixels. Then glDrawPixels is much faster but if I try to call
glEnable(GL_MULTISAMPLE_SGIS) after glDrawPixels the application becomes
surprisingly slow.

The test can be done with the example program complex.C (in
/usr/share/Performer/src/lib/libpf/C++) by including the lines
glDisable(GL_MULTISAMPLE_SGIS) and glEnable(GL_MULTISAMPLE_SGIS) at the
begining of the DrawChannel Callback. Running on a RE2, the program is then
about 20 times slower, while whithout the glEnable call it is OK.

Does somebody know how to explain this. Thanks in advance

-- 
Laurent Ach
SYSECA
tel :  33.1/41.48.06.60
fax : 33.1/41.48.06.60
email : ach++at++syseca.fr
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