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glEnable()

Started by Boku San Oct 11, 2004 at 7:48 PM 3 replies 500+ views

Original Post

Oct 11, 2004 at 7:48 PM

Are glEnable()/glDisable() calls universal? I mean, if you use a glPushMatrix(), does it only save current coordinates, or does it save settings as well? I'm writing a test application, and it seems that glPushMatrix() only stores coordinates, not what's enabled/disabled at the moment. Thanks in advance for responses, just want to know if it's bad coding or one of the APIs quirks.

cmptrgear

Oct 11, 2004 at 7:52 PM

glPushMatrix only saves the contents of the translation/rotation/scaling matrix (hence the name pushmatrix)

openGL is a big state machine so calling glEnable/glDisable switches various settings on and off, so if you call glEnable it stays enabled until you call glDisable on it.

Boku San

Author

Boku San

Oct 11, 2004 at 7:53 PM

Ah-HA! I KNEW IT!

Thanks for quick response.

benjamin bunny

144

benjamin bunny

Oct 11, 2004 at 7:55 PM

You seem to have misunderstood what glPushMatrix does. glPushMatrix pushes the current matrix onto the appropriate matrix stack. That's it. (edit: cmptrgear beat me to it)

glPushAttrib is probably more what you're after (see the docs).

Boku San

Author

Boku San

Oct 11, 2004 at 7:56 PM

Quote:
Original Post by benjamin bunny
You seem to have misunderstood what glPushMatrix does. glPushMatrix pushes the current matrix onto the appropriate matrix stack. That's it.

glPushAttrib is probably more what you're after (see the docs).

Okay, I didn't know that. The funny part is, I have the blue book right here, and the term right before glPushMatrix happens to be glPushAttrib...so, uh, my bad.

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