minimize glDrawElements or glBindBuffer...?

Graphics and GPU Programming Programming

Started by Funkymunky December 26, 2012 10:24 PM

2 comments, last by 21st Century Moose 11 years, 3 months ago

Funkymunky

1,420

Author

December 26, 2012 10:24 PM

I'm doing VBO based rendering. Which should I minimize, switching between the active VBO or the number of draw calls?

santa01

307

December 26, 2012 11:52 PM

OpenGL standard doesn't describe how VBO binding should be implemented internally, I guess this would be vendor specific, whereas reducing draw calls would give you an average performance boost.

powly k

657

December 27, 2012 02:58 AM

Why can't you minimize both? You pretty much only need a VBO and draw call per every different kind of a shader you're going to use.

21st Century Moose

13,459

December 27, 2012 08:44 AM

You don't even need a VBO per-shader, you could in theory have one big VBO containing all of your scene geometry and then adjust the params of your draw calls to use the appropriate ranges within it.

Direct3D has need of instancing, but we do not. We have plenty of glVertexAttrib calls.