[PyOpenGL-Devel] [ pyopengl-Bugs-2829309 ] glCallLists calls lists twice

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Bugs item #2829309, was opened at 2009-07-30 01:02
Message generated for change (Comment added) made by lethalman
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Category: GL
Group: v3.0.0
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Luca Bruno (lethalman)
Assigned to: Mike C. Fletcher (mcfletch)
Summary: glCallLists calls lists twice

Initial Comment:
Hello,
I'm using pyopengl 3.0.0~c1 from debian and mesa 7.6 from git. I'm almost pretty sure that glCallLists ([1]) calls the list 1 twice, so it happens for more than one list. Reproduce as follows:
1. glRenderMode(GL_SELECT)
2. ... glCallLists([1])
3. glRenderMode(GL_RENDER)
If the list 1 pushed only one name, you get two hits. This doesn't happen if you glCallList(1), you only get one hit as expected. I'm currently doing (glCallList(list) for list in lists) instead of glCallLists as temporarly workaround. I don't know if this happens with C++ directly, couldn't test so I've reported it here.

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Comment By: Luca Bruno (lethalman)
Date: 2010-02-22 22:36

Message:
I've already added a test case which fails on my platform, I don't know why
you are using another test made by you which it's clearly different than
mine, most of all because I said it only happens in COMPILE AND EXECUTE.

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Comment By: Mike C. Fletcher (mcfletch)
Date: 2010-02-22 21:53

Message:
Any news as to whether the test case fails on your machine?  I haven't been
able to reproduce yet.

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Comment By: Mike C. Fletcher (mcfletch)
Date: 2009-08-03 00:33

Message:
Not getting records was just because of interference from previous test
case for the same problem (duh!)  With current test case I pass on both
Win32 and Linux AMD64 (two different Linux AMD64 machines, with ATI and
nVidia cards).  Test case is in the 3.0.1a2 release if you wish to download
that and test on your machine (tests/test_core.py script).

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Comment By: Mike C. Fletcher (mcfletch)
Date: 2009-07-30 16:34

Message:
Hmm, I'm seeing exactly the same behaviour from both call-types, namely I'm
not getting any records at all (just ([],) don't have time to investigate
why just now.

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Comment By: Luca Bruno (lethalman)
Date: 2009-07-30 07:41

Message:
I rectify, it happens with GL_COMPILE_AND_EXECUTE (not necessary other
lists) and glCallLists must be in a list to call other lists:

        glMatrixMode(GL_PROJECTION)
        glLoadIdentity() 
        gluPerspective(40.0, 1.0, 1.0, 10.0)  
        glTranslatef (0, 0, -3)

        glMatrixMode (GL_MODELVIEW)
        glLoadIdentity ()
        glNewList(1, GL_COMPILE_AND_EXECUTE)
        glInitNames ()
        glCallLists([2]) # replace with gCallList(2)
        glEndList ()

        glNewList(2, GL_COMPILE)
        glPushName (1)
        glBegin (GL_POINTS)
        glVertex3f (0, 0, 0)
        glEnd ()
        glPopName ()
        glEndList ()

        glSelectBuffer (100)
        glRenderMode (GL_SELECT)
        glCallList(1)
        print glRenderMode (GL_RENDER)

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Comment By: Mike C. Fletcher (mcfletch)
Date: 2009-07-30 06:53

Message:
I can't replicate this failure condition.  I am using this code, on an
Ubuntu 3.0.1 Jaunty Linux Box with current BZR head of PyOpenGL:

	def test_glCallLists_twice( self ):
		"""SF#2829309 report that glCallLists doubles operation"""
		l = glGenLists(1)
		try:
			glEnd()
		except error.GLerror, err:
			pass
		glSelectBuffer( 23 )
		glRenderMode( GL_SELECT )
		glNewList( l, GL_COMPILE )
		glPushName( 222 )
		glEndList()
		depth = glGetIntegerv( GL_NAME_STACK_DEPTH )
		assert depth == (0,), depth # shouldn't have added in compile mode 
		glCallLists( [l] )
		depth = glGetIntegerv( GL_NAME_STACK_DEPTH )
		assert depth == (1,), depth # should have a single record
		glCallLists( [l] )
		depth = glGetIntegerv( GL_NAME_STACK_DEPTH )
		assert depth == (2,), depth # should have a second (identical) record
		glPopName()
		glPopName()
		glRenderMode( GL_RENDER )

which test passes.  Please provide a test that fails on your platform so I
can test whether we're looking at a bug that was fixed in the meantime or
an error in usage or a subtle corner case.

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