Would you like to play Nokia (J2ME) games on Retropie?

pjft

I just want to say that even though this thread has no other active participants, it's highly enjoyable, educational and even exiting to watch this unfold.

Thank you for pursuing this and for doing this in the forums! Looking forward to seeing what comes out of this.

Best.

Hex

@pjft The timing of this was awesome. I just finished PS by your help and @recompile ended up getting is working. I am of the opinion that pair programming is freaking awesome. It is way faster than if a single person were to do it. I will mostly archive these conversations in a README file once this is nearing an alpha release.

recompile

@hex said in Would you like to play Nokia (J2ME) games on Retropie?:

I also had a question about how audio will be handled. Will Java take care of it?

I don't know. I haven't even tried to properly implement audio yet. I would assume that it can be done on the java side.

@hex said in Would you like to play Nokia (J2ME) games on Retropie?:

Do you need joystick and mouse ? Considering no mobile phone had that.

Believe it or not, some games used a touchscreen. Doom II RPG isn't playable without it. Of course, it's the only game I know that requires it, so it's not exactly a priority.

As for joystick, I expect most people will want to play with their controller.

@hex said in Would you like to play Nokia (J2ME) games on Retropie?:

Some special key codes are >256

Not really a big deal to send a short instead of a byte. As long as it's consistent, it doesn't really matter. An int for type and an int for code if you want to really go wild.

I'm out for a few hours. I have to go earn a living.

Hex

@recompile I have updated the source code to have separate threads for Streaming (frames) and Capturing (keys).

C communicates all keyboard events over stdout as an (int) key code followed by \n
Key codes can be found here : https://wiki.libsdl.org/SDLKeycodeLookup

If F4 is received, C terminates cleanly. C also communicates that it received F4 by sending -1 as key code.

Another way to terminate C is to close its stdin. This tells C to terminate cleanly.

Is this sufficient?

To compile : g++ -lSDL2 -lpthread -o sdl_interface sdl_interface.cpp

Hex

This post is deleted!

recompile

@hex We'll need both keydown and keyup events.

Hex

@recompile Missed that. Will make changes and updoad new file.

Also how do you want the key up down difference? Your choice.

KEY 1 <-- Pressed
KEY 0 <-- lifted

recompile

@hex It doesn't really matter as long as I can tell the difference. A flag like that before the code should be just fine.

Hex

@recompile I have updated the code. Syntax is

KEY CODE\n

KEY = 1 : Down / 0 : Up
CODE -> As provided in url above

recompile

I guess back to you.
http://drichardson-shared.s3.amazonaws.com/freej2me-rpi.jar

I get a black screen and a mouse pointer.

Zigurana

This is great!
It's like witnessing the birth of a new emulator (not exactly, but close enough).

Keep up the momentum guys!

Hex

@recompile is there a syntax for that? I am getting an Array out of bounds exception

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0
	at org.recompile.freej2me.RetroPie.<init>(RetroPie.java:64)
	at org.recompile.freej2me.RetroPie.main(RetroPie.java:22)

Allanbuzzy

Yes, I'd love to play these mobile games on my RetroPie. And you probably know what my next splash screen might be...
wink

recompile

@hex You need to pass a jar.

java -jar freej2me-rpi.jar file:/home/pi/RetroPie/roms/j2me/ShadoWalker.jar 240 320

Hex

@recompile I have created a sample Java file in the dropbox folder. I have it working with "Broadcaster.java". Can you test it. That might point to the error. Let me know if this is sufficient.

Please download and recompile sdl_interface.cpp too

javac Broadcaster.java && java -classpath . Broadcaster 16 9

16 x 9 Grid size

recompile

@hex Again, just a black screen and a mouse pointer.

Hex

@recompile Shouldnt be happening. Let me post a video. Then you can compare.

recompile

@hex said in Would you like to play Nokia (J2ME) games on Retropie?:

Shouldnt be happening.

I know. I can't see anything wrong with your example, and it works for you.

The only difference I can see is that I'm running it on a pi3 and, iirc, you're running it on a pi0. Though I don't see why that would make a difference here.

Do you get any output when you run freej2me-rpi?

Hex

@recompile Here is the video of things that should be happening. Grid changes for every key press.

Are you by any chance running on Wayland?

Hex

@recompile I am running it on Linux. Probably that might be a difference. I am heading out so I will test in on Pi3 in an hour or so. Since I know that it is working, the rest is platform dependent and should work out well.

As you can see from the Java code i am sending over 4 bytes (ARGB) per pixel over stream Scalling is excellent and as expected. There is also a smooth scaling version. Can try that out too.