Java and C++ for game programming

This is a discussion on Java and C++ for game programming within the Game Programming forums, part of the General Programming Boards category; I'm taking some java classes right now, and was wondering if I would be able to integrate applications from both ...

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    Java and C++ for game programming

    I'm taking some java classes right now, and was wondering if I would be able to integrate applications from both languages?

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    Jack of many languages Dino's Avatar
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    Yes. Use JNI to call C / C++.
    Mac and Windows cross platform programmer. Ruby lover.

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    Super Moderator VirtualAce's Avatar
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    You can but I would not have any clue why you would want to. If you want to make a game in Java then use Java. If you want to make one in C++ then use C++. I have no idea how using both and will help you.

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    Crazy Fool Perspective's Avatar
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    Quote Originally Posted by Bubba View Post
    You can but I would not have any clue why you would want to. If you want to make a game in Java then use Java. If you want to make one in C++ then use C++. I have no idea how using both and will help you.
    agreed. And if you just want C++ for the rendering capabilities, there are libraries out there that already implement the JNI bindings for OpenGL.

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    Woof, woof! zacs7's Avatar
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    Yes except it's probably going to end up faster to have a C/C++ "rendering" library, that calls OpenGL. Since there is probably more calls to OpenGL than the rendering library. Because calls through the JNI adds HUGE overhead.

    You may want to check out Jake2, a Java port of the Quake2 engine. Most of the 40% slowdown is caused by allocations and calling the OpenGL bindings through JNI.

    Either way, I agree with the others. Use C++ or Java, not both . Although it'd probably be cool to write the map editor in Java.
    Last edited by zacs7; 10-18-2008 at 05:24 PM.

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    (?<!re)tired Mario F.'s Avatar
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    As long as you use native controls... just please boycott java controls.
    The programmer’s wife tells him: “Run to the store and pick up a loaf of bread. If they have eggs, get a dozen.”
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    Reimplementing a large system in another language to get a 25% performance boost is nonsense. It would be cheaper to just get a computer which is 25% faster.

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    Woof, woof! zacs7's Avatar
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    > As long as you use native controls... just please boycott java controls.
    Second.

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    Howbout the best way to communicate c++ and java program,is it rpc-xml???
    yeah so nobody accuse me of going off topic,hmmm let say i want to create game A in C++ and game B in java..what library should I use so they both talk to each other???
    it's rpc-xml the way to go?

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    Woof, woof! zacs7's Avatar
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    No, that'd be extremely slow. Depends on how much, and how frequently you need to send data between A and B.

    The fastest option is still JNI, but it is slow compared to native calls. For example C++ calling a C library function.

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    JNI i guess is the way to go then...
    thanks.

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    Dr Dipshi++ mike_g's Avatar
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    I agree with zacs7 in that you want to be making as few calls through the JNI as possible. Although, unlike everyone else, I don't see why you should not use both C++ and Java.

    For anyone wanting to play around with the JNI this Netbeans tutorial got me going with it:
    http://cnd.netbeans.org/docs/jni/beginning-jni-win.html

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    Crazy Fool Perspective's Avatar
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    Quote Originally Posted by Mario F. View Post
    As long as you use native controls... just please boycott java controls.
    SWT all the way. Native widgets, platform independent, and if a platform doesn't support the widget you want to use it's emulated.

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    Super Moderator VirtualAce's Avatar
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    I agree with zacs7 in that you want to be making as few calls through the JNI as possible. Although, unlike everyone else, I don't see why you should not use both C++ and Java.
    Normally you would choose a language based on how it is going to help you reach your long term goals. I don't see what Java brings to the table in the context of a game that you could not do just as well and faster in C++. Java would certainly bring a lot of GUI functionality, however, most in-game GUIs are either using pure Direct3D or they are using some type of flash API. It may actually take more time to streamline and stabilize a C++/Java game than it would just to do it either in pure Java or pure C++.

    So my question to the OP is what is Java bringing to the table that C++ isn't bringing you. Or on the other hand what is C++ bringing to the table that Java isn't?

    Before you start some mixed language program it might be a good idea to research the pros and cons of doing so. It could save you tons of dev time and a lot of headaches in the long run.

  14. #14
    Dr Dipshi++ mike_g's Avatar
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    Yeah, you have a point there. It may not be suitable for the project.

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