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[java] Java / JNI / DirectX

Started by Ataru Jul 30, 2003 at 11:40 AM 3 replies 1.5k views

Original Post

Jul 30, 2003 at 11:40 AM

I''ve seen some people discussing similar things before, but this is one of those cases where the "why would you use java if you want to write the whole enginge in C++" argument does not work. I''m thinking of writing a native code 3D application in C++, however this simulation is data driven from a large Java application that frankly I don''t want to touch. How easy would it be, for my application to have a button that says "run 3D simulation", and then calls through JNI my c++ 3D app, using DirectX or OpenGL. I want to create my own graphics window, etc... I don''t care about portability, I don''t want to bother wrapping DirectX or OpenGL to Java, I want a java application, at some point, to switch to a c++ graphics engine. It looks like something like this should be easy. Is it as easy as I''m making it out to be?

nickwinters

Jul 30, 2003 at 5:01 PM

Theoretically, you should be able to do that. Just try doing simple things like creating a window and see what happens. Since OpenGL bindings exist, I know you should be able to do so with DirectX. Go to http://www.lwjgl.org and take a look at their source code. It''s a full OpenGL binding, but at least the window classes should get you started.

nickwinters

Jul 31, 2003 at 11:24 AM

Actually, try getting your hands on the bastardization (IMHO) of Java. eg. J++ or maybe J#. Both should be able to do what you want.

Edit: IMHO

[edited by - nickwinters on August 1, 2003 12:49:24 PM]

NuffSaid

Aug 1, 2003 at 4:07 PM

Alternately, seeing as you aren''t really integrating the 3D app into the existing Java app, you could just code the entire 3D part in C++.

Then, in the Java app, have a button called "Run 3D Simulation", which gets a Runtime object, which then just executes the C++ app. The C++ app could take a few parameters on the command line so you can pass whatever additional information to it (e.g. file name to load, etc).

This is something similar to the C function system() or the Win32 function ShellExecuteEx().

CaptainJester

Aug 5, 2003 at 8:21 PM

Look at the various flavours of Runtime.exec(...);.

First make it work,
then make it fast.
--Brian Kernighan

"I’m happy to share what I can, because I’m in it for the love of programming. The Ferraris are just gravy, honest!" --John Carmack: Forward to Graphics Programming Black Book

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