Clément Foucault
f6ad538040
Introduce a UI batch cache. For the moment it's only used by widgetbase so leaving it interface_widgets.c. If it grows, it can have its own file. Like all preset batches (batches used by UI context), vaos must be refreshed each time a new window context is binded. This still does 3 GWN_batch_draw in the worst cases but at least it does not use the IMM api. I will continue and batch the 3 calls together since we are really CPU bound, so shader complexity does not really matters. I cannot spot any difference on all the widgets I could test. I did not use any unit tests so I cannot tell if there is really any defects. This is not a complete rewrite but it adresses the top bottleneck found after a profilling session.