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

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!

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@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

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@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

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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

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@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

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

Hex

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

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@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.

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

Are you by any chance running on Wayland?

No, I'm running it on RetroPie 4.2 on my pi3. No X11, Xorg, Mir, or Wayland

I compiled sdl_interface.cpp on there as well, copying it to /usr/bin. I ran freej2me-rpi and your example on that same setup, and got the same result both times -- a black screen and a mouse pointer.

From what I can see, J is sending to C. I can even capture an error trying to write to the stream after I kill C with F4.

Hex

@recompile Yea I saw your comment after I typed mine. Let me check what might be an issue.

Hex

@recompile I have found the error. Apparently SDL2 uses OpenGLES which freaks out if not drawing from main thread. I have fixed it, tested it and updated the new code.

~~Edit : Key events are not read. Let me check~~ I was typing on my ssh machine rather than the keyboard connected to the Pi :|

All in all its working as expected. I tried raw streaming the image, Python, and Java solutions. All are working on Pi3 as of now.