On the #Cocoa port, I'll probably create one CGImage by tile, and cache them.

On each frame, I can then draw the CGImages on a CGBitmapContext— and pass the buffer to OpenGL or Metal.

I just wonder how to update the CGImages when the underlying buffer changes. Do I need to re-create the image? Or can I update the underlying buffer directly? What about locking or race conditions?

Stay tuned for the next episode of graphics-programming-for-newbies!