CODEWITHSUNDEEP
javaandroidopengl-eslibgdx
ElSajko
ElSajko

Reputation: 1640

LibGDX getting max texture size - null pointer exception

I try to get max texture size on device where app is running:

protected int getMaxTextureSize() {
    IntBuffer buf = BufferUtils.newIntBuffer(16);
    Gdx.gl.glGetIntegerv(GL20.GL_MAX_TEXTURE_SIZE, buf); //here is null pointer exception
    return buf.get();
}

and app crashes when I use it:

Exception in thread "main" java.lang.NullPointerException
    at com.example.ResourceManager.getMaxTextureSize(ResourceManager.java:32)
    at com.example.ResourceManager.<init>(ResourceManager.java:23)
    at com.example.Game.<init>(Game.java:17)
    at com.example.desktop.DesktopLauncher.main(DesktopLauncher.java:15)

(on Android same exception appears)

Why? Every forum or docs say it is correct.

Upvotes: 2

Views: 208

Answers (1)

derhass
derhass

Reputation: 45332

The stack trace shows that the NullPointerException does not happen inside Gdx.gl.glGetIntegerv, strongly indicating that Gdx.gl.glGetIntegerv itself might be a NULL pointer.

Since glGetIntegerv is a core function which must be present in all versions of GL and GLES, the most plausible explanation is that you call this function before the GL binding is properly initialized.

For this function to return meaningful values, you will always need a valid GL context in any case, so you must move it to some point after the GL context is created.

Upvotes: 1

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