VBO-backed Geometry

[theacodes]

Give geometries the ability to be VBO backed.

• lock() will push geometry data into a VBO, but keep the data in RAM as well.
• lock(true) will push geometry data into a VBO and drop RAM data
• if a geometry is already locked and lock() is called again, the VBO is updated.
• unlock() will release the VBO and copy geometry data back if necessary.

BatchRenderer will have to be changed to accomodate rendering VBOd geometries.

[ruby0x1]

I'd suggest a refresh() or update() (like BatchGeometry?) that syncs up. Mainly because lock would be unrelated, as a word, and because its overloaded as a function for its name?

[theacodes]

Good idea, I think we can keep the behavior of lock() calling update() if the geometry is already locked.

[theacodes]

b4311dc7d9 adds tentative support. Gotta add the ability to pull the data back from the gfx card and some more extensive testing.

[theacodes]

fdde3c2 finishes support for this feature.