Bug 242 - Unable to select single-buffered visual
Summary: Unable to select single-buffered visual
Alias: None
Product: Jogl
Classification: JogAmp
Component: core (show other bugs)
Version: 1
Hardware: All all
: P3 normal
Assignee: Sven Gothel
: 295 (view as bug list)
Depends on:
Reported: 2006-08-14 10:18 CEST by Sven Gothel
Modified: 2010-03-24 07:49 CET (History)
0 users

See Also:
SCM Refs:
Workaround: ---


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Description Sven Gothel 2010-03-24 07:49:30 CET

---- Reported by kcr 2006-08-14 10:18:07 ----

There is a bug in the X11GLDrawableFactory.glCapabilities2AttribList method that
prevents an app from selecting a single-buffered visual on X11 platforms. That
method treats GLX_DOUBLEBUFFER as if it were an attribute that takes a boolean
parameter, which is incorrect for glXChooseVisual. The GLX_DOUBLEBUFFER
attribute takes no parameter, rather its presence indicates that a double
buffered visual should be selected. This bug causes two problems. First, if a
single-buffered visual is requested, the request will not be honored. Second,
the "false" value will be interpreted as "None" causing all subsequent
attributes to be ignored.

---- Additional Comments From kcr 2006-08-14 10:21:22 ----

Btw, you need to be careful when fixing this bug if the output of this method is
ever used by glXFBConfig, which *does* treat GLX_DOUBLEBUFFER as a boolean
attribute that takes a parameter.

---- Additional Comments From kcr 2006-08-14 10:25:00 ----

One more thing. The GLX_STEREO attribute is being set correctly for
glXChooseVisual and, as such, is currently incorrect when used by glXFBConfig.
In other words, it has the opposite problem of GLX_DOUBLEBUFFER.

---- Additional Comments From kbr 2006-08-14 11:43:53 ----

Fixed GLX_DOUBLEBUFFER and GLX_STEREO specifications for both
on-screen and pbuffer visuals as per suggestion.

---- Additional Comments From kbr 2007-04-19 20:29:59 ----

*** Issue 295 has been marked as a duplicate of this issue. ***

--- Bug imported by sgothel@jausoft.com 2010-03-24 07:49 EDT  ---

This bug was previously known as _bug_ 242 at https://jogl.dev.java.net/bugs/show_bug.cgi?id=242

Unknown bug field "has_duplicates" encountered while moving bug
     <when>2007-04-19 20:30:00</when>