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  Question regarding interaction between VAO bindings and sperate VBO bindings  (Read 693 times)
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Offline greenOwl

Junior Devvie

Medals: 1

from Germany

« Posted 2013-03-24 18:40:36 »


I've got the following question for you:
When I set up my VAO I bind the VAO (glBindVertexArray) then bind the VBO (glBindBuffer(GL_ARRAY_BUFFER)) and IBO (glBindBuffer(GL_ELEMENT_ARRAY_BUFFER)) and then unbind the VAO. As I understand it now the VBO and the IBO are "connected" to the VAO and before I want to draw something I just have to call glBindVertexArray() (without binding the VBO and IBO again).

Now, can I bind the VBO / IBO separately (e.g. for calling glBufferSubData()) and don't lose the "connection" between VAO and VBO / IBO (or do I have to go through the hole binding VAO, then VBO/IBO again)?

I ask this question because I changed up some code (for optimizing performance) and now I get a
org.lwjgl.opengl.OpenGLException: Cannot use offsets when Element Array Buffer Object is disabled 
I can't quite trace back where the problem is.
EDIT: Found the problem that caused the exception (missing glGenBuffers() call  Roll Eyes). Question above remains but now I think that I can bind/unbind the VBO/IBO as much as I want without losing the "connection". I'd be very grateful if some could confirm.

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« Reply #1 - Posted 2013-03-24 19:42:17 »

No, the state is stored in the VAO and it shouldn't be modified if you use the VBO for different purposes AFAIK.

Offline greenOwl

Junior Devvie

Medals: 1

from Germany

« Reply #2 - Posted 2013-03-25 18:54:58 »

Thank you, everything works now and I can confirm:
You can bind and unbind the VBO / IBO as much as you want without disturbing the VAO.

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