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OSX/Metal people: do you know of any guide how to create a simple window with a metal layer from code? I have a MTKView but it seems I cannot do things like while(running) { repaint(); } on it. Do I need it to event based? Can I fake it?(OSX noob here)
You’d normally want to draw in response to a CVDisplayLink callback (which MTKView uses internally on macOS), but you can also use the setNeedsDisplay/updateLayer mechanism to provoke drawing into a CAMetalLayer. Happy to discuss further on DM.
As you observe, Cocoa generally wants to be event-driven, so you wouldn’t want to redraw in a tight loop because (1) you’ll starve the runloop event processing mechanism and (2) you’re going to wind up blocking in -[CAMetalLayer nextDrawable] if you try to run too far ahead.
Right! I suspected I needed to go event driven somehow. But how do you usually implement a game loop with that? Trigger a new request for a draw when the last one finishes?
Perhaps. There are of course many, many ways to tackle synchronization, but in the simplest case, you’d run a CVDisplayLink at your target frame rate and kick off rendering from the callback.
I'd be interested to see any proof-of-concept / minimal code that does this *cleanly*. (I tackled the same problem a few months ago with no Cocoa knowledge at all and ended up with a solution that I found... gross)
I don't think I have done it cleanly enough, but I will try to pull it out of framework and get some code posted later. Focus for me right now is rendering abstraction and not game loop/window management, sorry
Understood. Feel free to get in touch if I can help down the line.
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