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ade-the-heat

OpenGL most expensive Opengl call-VBO

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I read an article yesterday at opengl.org that the most expensive call is in VBOs. Now I tried again to find the article but couldn't. If I remember it said that VBOs were the most expensive and then state changes. I'm trying to work out what it meant by VBO's being expensive: a) chucking the arays onto the GPU memory b) telling the grfx card to use a different vbo c) changing data in the vbo Thanks Ade

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yes, the function is expensive because it peforms the upload.

In the case of the others for using a VBO it depends on the driver, NV and ATI do setup in different places iirc.

Mapping a VBO can cause you stalls, unless handled properly this should be avoided.

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