Paul,
I believe the poster in that LWJGL thread is mistaken. Vertex array objects are not required in a 3.2 core profile context. See the OpenGL 3.2 core profile spec, which clearly states that a default (ID = 0) vertex array object is used when the app hasn't explicit bound an app-created VAO.
Yes, I think so too. Unfortunately Apple decides that a VAO is required. I can fill a radar and ask in the developer forums but, for now, what is the best solution?
Best regards,
David If you are not getting correct rendering unless you bind a VAO, then that sounds like a possible driver bug. On Windows, for example, I am able to get correct rendering if I modify osgsimplegl3 as follows: * Change the "#version 140" to "#version 150" in both shader source strings. * Change the version string from "3.1" to "3.2". * Set the profile bit to 0x1 (WGL's core profile bit). Then, "osgsimplegl3 teapot.osg" renders correctly without any warnings or errors. Assuming it's a driver bug, I'm not sure how we'd want to work around it. However, I imagine a submission to add VAO support to OSG Drawables might be considered by Robert for inclusion in a future release. -Paul On 3/3/2012 4:08 PM, David Garcia wrote:
Paul,
Seems that OSG must use VAO. Look at this message for the same error:
http://lwjgl.org/forum/index.php?topic=4071.msg22035#msg22035
And then this comment in the next message:
"Oups... My Bad. OpenGL 3.2 Core REQUIRES the use of VAOs (not just VBOs...)
I added VAO instructions, now It work perfectly !"
Maybe this will make sense to you :)
David
On Mar 3, 2012, at 23:58 , David Garcia <da...@aimsun.com
<mailto:da...@aimsun.com>> wrote:
Paul,
I cannot help, my knowlenge in GL3 is quite limited. As far as I know Lion
implementation is strictly Core profile only and probably OSG is mixing GL3
with older profiles. You can find a bit more information, but not too much, in
the Apple Developer forums.
My original problem was to use a GLSL 1.5 program in OSG's Mac version. In
Windows and Linux the system will create the best profile possible for OSG,
automatically and without enabling GL3 explicitly, and, in my case, is version
3.3. In Mac the developer must create explicitly a 3.2 profile. This is not
the case in OSG and my app fails.
As far as I know my only options are either to code the GLSL function in
version 1.2 or run OSG in GL3 mode.
Best regards,
David
On Mar 3, 2012, at 2:56 , Paul Martz <pma...@skew-matrix.com
<mailto:pma...@skew-matrix.com>> wrote:
I'm assuming you are referring to the shader program info log message:
Validation Failed: No vertex array object bound.
That's a mystery. It doesn't appear on Windows. I find it odd that OS X would
require the use of vertex array objects when you open a 3.x context, but
that's what the error text appears to imply. I did a quick web search and
didn't see any discussion of such a message.
-Paul
On 3/2/2012 5:10 PM, David Garcia wrote:
Following Paul advice I try osgWorks (2.0.0) teapot. I got different errors. In
the state I have add to extract more information:
gc->getState()->setCheckForGLErrors(osg::State::ONCE_PER_ATTRIBUTE);
The output is in the zip file (errors.txt).
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