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pd-rs / crankstart

A barely functional, wildly incomplete and basically undocumented Rust crate whose aim is to let you write Games for the Playdate handheld gaming system in Rust.
MIT License
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A game built without `--device` running on device tries to run the Lua `playdate.update` #74

Open paulyoung opened 1 year ago

paulyoung commented 1 year ago

I’m not sure if this is a bug but it might be worth documenting if not.

I made a PR with some changes that allow interacting with the Lua runtime. I had to define an empty main.lua file and add the resulting main.pdz file to assets in Crank.toml or I got an error about main.pdz being missing when running in the simulator, but otherwise everything worked great.

(I’m now wondering if that’s even necessary if I build with --device and will try that later, see below)

As explained in this dev forum post; if I build with crank build and then upload via the simulator, something tries to call playdate.update in Lua. This obviously doesn’t exist, but if I define it in main.lua the function gets called.

If I build with crank build --device and upload to device via the simulator, my Rust update function gets called.

For what it’s worth, I’m uploading to device via the simulator because crank run --device hangs (https://github.com/pd-rs/crankstart/issues/41#issuecomment-1763471714)

paulyoung commented 1 year ago

I suppose this may actually belong in the crank repo, but I'll follow up here anyway.

I had to define an empty main.lua file and add the resulting main.pdz file to assets in Crank.toml or I got an error about main.pdz being missing when running in the simulator, but otherwise everything worked great.

(I’m now wondering if that’s even necessary if I build with --device and will try that later, see below)

I just tried this and it is necessary. --device makes no difference.

As explained in this dev forum post; if I build with crank build and then upload via the simulator, something tries to call playdate.update in Lua. This obviously doesn’t exist, but if I define it in main.lua the function gets called.

If I build with crank build --device and upload to device via the simulator, my Rust update function gets called.

The opposite appears to be true as well. If I do crank build --device and open the resulting .pdx in the simulator, I get a no such function 'update' error because something is trying to run a Lua playdate.update function. If I go to Device > Upload Game to Device the Rust update function runs on the device and things work as expected.