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Java-Gaming.org > Java Game APIs & Engines > OpenGL Development > JOGL Development > opengl.util.BufferUtil and VBO
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  opengl.util.BufferUtil and VBO  (Read 1407 times)
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Offline blizzard

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Posts: 19
« on: 2011-10-13 04:50:19 »
Hello

I start using VBO´s and saw different ways to initialize the buffers.
One is using the opengl.util.BufferUtil classes.

Is this the best way and where do I get it ?
thanks
Offline theagentd

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« Reply #1 on: 2011-10-13 05:30:16 »
Yes. BufferUtil ensures that the byte buffer created is direct and that the correct byte order (native byte order) is used. It's basically equal to:
1  
ByteBuffer.allocateDirect(size).order(ByteOrder.nativeOrder());
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Offline blizzard

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« Reply #2 on: 2011-10-13 06:26:08 »
Ok, thanks

but where can I download it ? It was not in the packages that I have downloaded for using jogl.
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Offline theagentd

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« Reply #3 on: 2011-10-13 09:17:38 »
Ah, you're using JOGL. BufferUtil is part of LWJGL, which is an alternative to JOGL. Personally I prefer LWJGL, but you can just make your own utility class for buffer creation. To create other buffers (FloatBuffer for example) just create a ByteBuffer (with the code I posted) with 4 times the size (as you'll need 4 bytes per float) and use asFloatBuffer().
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Offline sproingie

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« Reply #4 on: 2011-10-13 11:56:41 »
If you're using JOGL, you don't use ByteBuffers.  You should be able to use a plain-jane array.
Offline Z-Knight

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« Reply #5 on: 2011-10-13 12:26:07 »
Quote from: theagentd on 2011-10-13 09:17:38
Ah, you're using JOGL. BufferUtil is part of LWJGL, which is an alternative to JOGL. Personally I prefer LWJGL, but you can just make your own utility class for buffer creation. To create other buffers (FloatBuffer for example) just create a ByteBuffer (with the code I posted) with 4 times the size (as you'll need 4 bytes per float) and use asFloatBuffer().

wait, what?!?  BufferUtil is part of JOGL... it is in: com.sun.opengl.util.BufferUtil

So this is what I usually do:
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vertices = ByteBuffer.allocateDirect(totalBuffer * BufferUtil.SIZEOF_FLOAT).order(ByteOrder.nativeOrder()).asFloatBuffer();


You also need to remember to 'rewind' the buffer, I think:

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vertices.rewind();
Online ra4king

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« Reply #6 on: 2011-10-13 17:35:55 »
No you don't rewind the buffer, you flip it:
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vertices.flip();
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Offline gouessej

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« Reply #7 on: 2011-10-13 18:13:04 »
Hi

Quote from: blizzard on 2011-10-13 06:26:08
Ok, thanks

but where can I download it ? It was not in the packages that I have downloaded for using jogl.
I assume you use an obsolete version of JOGL (JOGL 1.1.1a?). In JOGL 2.0, this class has been renamed Buffers:
http://jogamp.org/deployment/jogamp-next/javadoc/gluegen/javadoc/com/jogamp/common/nio/Buffers.html

I'm sorry, I was busy and many people here gave you confusing answers. I advise you to ask questions specific to JOGL on the official JogAmp forum. Best regards.
Julien Gouesse
Offline theagentd

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« Reply #8 on: 2011-10-13 22:17:26 »
Ignore me, listen to the JOGL expert!  Yawn
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Offline blizzard

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« Reply #9 on: 2011-10-14 03:23:03 »
Ok I ignore you ;-)

thanks for all your answers
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Offline gouessej

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« Reply #10 on: 2011-10-14 06:08:27 »
Hi

Quote from: theagentd on 2011-10-13 22:17:26
Ignore me, listen to the JOGL expert!  Yawn
Sorry, I didn't want to be harsh with you and the class Buffers from JOGL works like the class used by our competitor you quoted.

blizzard, I hope you now understand that you don't need to download another JAR to use the class Buffers. Actually, I assume you were speaking about com.sun.opengl.utils.BufferUtils which was in JOGL 1.1.1a and renamed com.jogamp.common.nio.Buffers in JOGL 2.0.
Julien Gouesse
Offline theagentd

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« Reply #11 on: 2011-10-14 07:10:49 »
Nonono, I wasn't insulted at all, I just felt a little ashamed because I was talking out of my ass! xD
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Offline blizzard

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« Reply #12 on: 2011-10-14 07:46:00 »
Yes I understand, I found everything  and at the moment my first VBO test programms  are running well :-)
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