Setting audio renderer to null results in a failure to load lwjgl native library

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1

Using appsettings to set the audio renderer to null as in

  AppSettings appSettings = new AppSettings(true);
  appSettings.setCustomRenderer(AwtPanelsContext.class);
  appSettings.setAudioRenderer(null);

results in the following exception
Exception in thread “LWJGL Renderer Thread” java.lang.UnsatisfiedLinkError: no lwjgl in java.library.path
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1856)
at java.lang.Runtime.loadLibrary0(Runtime.java:845)
at java.lang.System.loadLibrary(System.java:1084)
at org.lwjgl.Sys$1.run(Sys.java:73)
at java.security.AccessController.doPrivileged(Native Method)
at org.lwjgl.Sys.doLoadLibrary(Sys.java:66)
at org.lwjgl.Sys.loadLibrary(Sys.java:95)
at org.lwjgl.Sys.(Sys.java:112)
at com.jme3.system.lwjgl.LwjglOffscreenBuffer.run(LwjglOffscreenBuffer.java:148)
at java.lang.Thread.run(Thread.java:722)

2

Seems you don’t have lwjgl on the classpath, do you use the SDK? Else check the wiki for the meaning of each jar, its under “source structure”.

3

We’re using the jar files and not the SDK. However, my applications work fine except when i do appsettings.setAudioRenderer(null). For some reason, setting the audio renderer to null results in a failure to load the lwjgl libraries.

I think the problem is in extractNativeLibs in combination with using the AwtPanelsContext. In Natives.extractNativeLibs(Platform, AppSettings) the code to check which libraries to extract is

[java]if (renderer != null) {
if (renderer.startsWith(“LWJGL”)) {
needLWJGL = true;
}
}
if (audioRenderer != null) {
if (audioRenderer.equals(“LWJGL”)) {
needLWJGL = true;
needOAL = true;
}
} [/java]

We have set the renderer to AwtPanelsContext.class, failing the renderer.startsWith(“LWJGL”) test. This means that setting the audioRenderer to null will result in not extracting the native libraries. Changing

[java]
AppSettings appSettings = new AppSettings(true);
appSettings.setCustomRenderer(AwtPanelsContext.class);
appSettings.setAudioRenderer(null);
[/java]

to

[java]
AppSettings appSettings = new AppSettings(true);
appSettings.setCustomRenderer(AwtPanelsContext.class);
try
{
Natives.extractNativeLibs(JmeSystem.getPlatform(), appSettings);
}
catch (IOException e)
{
throw new RuntimeException(“Cannot load native libs”);
}
appSettings.setAudioRenderer(null);
[/java]

results in a working renderer. We want to disable the audio renderer because we don’t use it and it fails to close properly on some platforms. I think the solution is to make the Natives.extractNativeLibs have a more robust check ( quick fix would be to do renderer.startsWith(“LWJGL”) || renderer.startsWith(“CUSTOMAwtPanelsContext”), but that would not be robust for other contexts)

1 Like
4

Ok, thanks. Funny enough, I am about to rework the renderer and natives extraction code soon anyway, so there won’t be a need for workarounds in the engine :slight_smile: