@Aressera Good points all around! This feels like a direction I can get started in.

Flone said:
Handle all user input (so handle all windows messages).

You don't want to do that! Windows messages are messed up with a lot of stuff that you don't need and so you should never (even if most tutorials do so) do the entire game and message handling in the main thread! The message loop was…

It looks like the compiler is choking because of that ‘blendedBiome’ buffer that you declared as a local variable, but didn't initialize. You either need to assign a valid buffer to that variable, or make it a global if you intend it to be an additional bound buffer for your dispatch.