Changing vertex array object

Question

Lets see this code:

glGenVertexArrays(1, &name);
glBindVertexArray(name);

glBindBuffer(GL_ARRAY_BUFFER, someBuffer1);
glVertexAttribPointer(...);

(...)

glBindBuffer(GL_ARRAY_BUFFER, someBuffer2);
glVertexAttribPointer(...);

(...)

glBindVertexArray(0);

What happens if I decide to do something like this:

glBindVertexArray(name);

glBindBuffer(GL_ARRAY_BUFFER, someBuffer3);
glVertexAttribPointer(...);

(...)

glBindBuffer(GL_ARRAY_BUFFER, someBuffer4);
glVertexAttribPointer(...);

(...)

glBindVertexArray(0);

? Can I change vertex declaration layout this way? Are there ways to do it?

sorry, dont recognized which of questions you answered. What happens when I call glVeretexAttribPointer once again? Will any previous glVeretexAttribPointer's be deleted or somewhat? — user3808059, Oct 09 '15 at 15:21
so, if I need to change only one buffer for binding, I have to reset others? — user3808059, Oct 09 '15 at 15:25

score 1 · Accepted Answer · answered Oct 09 '15 at 15:22

Yes. That's precisely why a simple solution to avoiding VAO's altogether is generating and binding a single one at program start. However, that mitigates any performance benefits you may gain -- switching VAOs is (or should be) faster than redefining the vertex layout.

Changing vertex array object

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