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FantasyVII

OpenGL glGen.* vs glCreate.*

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Hello,

 

So I'm learning OpenGL 4.5 for the first time. Can someone please explain what is the difference between glGen.* and glCreate.* and when should I use one rather than the other?

 

for example:- 

glGenBuffers vs glCreateBuffers

or 

glGenVertexArrays vs glCreateVertexArrays

 

thanks.

Edited by FantasyVII

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glCreate functiosn were introduced by GL_ARB_direct_state_access and the difference is that the old glGen functions don't actually create an OpenGL object at all - all that they do is give you an unused name, and the object is not created until the first time you bind it.  Since DSA gets rid of the need to bind-to-create, the glCreate functions will actually create the underlying GL object (with a default/uninitialized/undefined state as appropriate) as well as give you an unused name for it.

 

This is all discussed in issue #12 of the linked specification: "What's the purpose of the new Create* API?"

 

As a general rule, if you're using DSA then use glCreate, if you're not then use glGen, but don't mix-and-match.

 

 

I see. Thanks smile.png

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