LWJGL3 4.3 debugging. How do I get the message?

[asyx]

Hello!

With LWJGL 2.x, you'd get a string as a parameter in the invoke method. But now, the invoke method looks like this

public void invoke(int source, int type, int id, int severity, int length, long message, long userParam)

So, how do I get the message, as a string, from the pointer I've got here?

[spasi]

Hey asyx,

You can get a Java String like this:

import static org.lwjgl.system.MemoryUtil.*;
// ...
String msg = memDecodeUTF8(memByteBuffer(message, length));

If you would simply like to print the error message, see the setupDebugMessageCallback method on GLContext, e.g.:

debugProc = GLContext.createFromCurrent().setupDebugMessageCallback();

It will also choose the best debug output implementation available (from GL43, KHR_debug, ARB_debug_output, AMD_debug_output).

[asyx]

That's easier than I expected. Thanks.

[doev]

If you would simply like to print the error message, see the setupDebugMessageCallback method on GLContext, e.g.:

debugProc = GLContext.createFromCurrent().setupDebugMessageCallback();

It will also choose the best debug output implementation available (from GL43, KHR_debug, ARB_debug_output, AMD_debug_output).

This is not working anymore (3.0.0b_build35), cause "GLContext" is not available. What is the recommend way to switch on opengl error/debug messages?

[spasi]

The setupDebugMessageCallback methods have moved to the GLUtil class:

GL.createCapabilities();
debugProc = GLUtil.setupDebugMessageCallback();

[FortressBuilder]

With the latest nightly builds you can also use the getMessage utility method inside GLDebugMessageCallback.

String msg = getMessage(length, message);