Check for W = zero position

[greggman]

It might be possible to check, for any attribute that as pos in the name like position, aPosition, a_position that you want to check for W = 0? See #3

This would basically be, if attribute is named .*pos.* and attribute is size = 4, then read through buffer and check that W != 0. I don't know if it's worth it. Most people use size = 2 or size = 3 for position.

[allan-bonadio]

bad idea to guess at user's variable names. I searched for 'pos' on four web pages I already had open (some pretty big), and came up with this list:

composed
exposure
impossible
opposite
opposition
positive
possessed
possession
post
posterity
posthumously
postpone
proposal
proposed
purpose
purposes

[greggman]

None of those names are likley use for an attribute which is the only place this would come up.

Guessing names is common in GPU debugging tools because there's no other info to go on.

You could ask the user "tell us the names" but most users will never read the docs and therefore not benefit from the checks. Those 1 out of 10000 users that have a clashing name will see the error, then look it up in the docs and find out how to turn off the feature or set a different pattern for checking.