glCopyBufferSubData missing?

[fschutt]

It seems that the current Gl trait is missing a copy_buffer_sub_data() function, which corresponds to the glCopyBufferSubData function - this is an important function necessary for deep-cloning vertex / index buffers without making roundtrips to the CPU. Is it intentional that this function has been left out or is this a bug?

[jdm]

Not intentional. We would merge a pull request that adds it.