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  about glGetFloat  (Read 3791 times)
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Offline Ushio

Junior Newbie





« Posted 2011-05-27 12:22:46 »

I can't use glGetFloat() function well. please help me.

I wrote this code.
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GL11.glMatrixMode(GL11.GL_MODELVIEW);
GL11.glLoadIdentity();
GL11.glScalef(10.f, 10.f, 10.f);
FloatBuffer FB = ByteBuffer.allocateDirect(16 * 4).asFloatBuffer();
GL11.glGetFloat(GL11.GL_MODELVIEW, FB);

for(int i = 0 ; i < 16 ; ++i)
{
  System.out.println(FB.get(i));
}

but, this program out put this.
0.0
0.0
0.0
0.0
...
0.0
all Zero.
this output is not good.
it is different from I expected.
Where is wrong?
 
I'm Japanese. So My English may have some problems. Please pardon me.

Offline Mike

« JGO Spiffy Duke »


Medals: 149
Projects: 1
Exp: 6 years


Java guru wannabe


« Reply #1 - Posted 2011-05-27 14:03:32 »

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GL11.glMatrixMode(GL11.GL_MODELVIEW);
GL11.glLoadIdentity();
GL11.glScalef(10, 10, 10);
FloatBuffer modelview = BufferUtils.createFloatBuffer(16);
GL11.glGetFloat(GL11.GL_MODELVIEW_MATRIX, modelview);
for(int i = 0 ; i < 16 ; i++)
{
  System.out.println(modelview.get(i));
}


Mike

My current game, Minecraft meets Farmville and goes online Smiley
State of Fortune | Discussion thread @ JGO
Offline gouessej
« Reply #2 - Posted 2011-05-27 14:04:30 »

The answer is here:
http://lwjgl.org/forum/index.php?topic=1215.0

Mickelukas, rewind() is not necessary in this case, isn't it?

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Offline Ushio

Junior Newbie





« Reply #3 - Posted 2011-05-27 16:08:52 »

Thank you for your appropriate answers !

I could get good program output,
because I used BufferUtils.createFloatBuffer() Instead of BufferUtils.createFloatBuffer(),
I used glGetFloat(GL11.GL_MODELVIEW_MATRIX...) Instead of glGetFloat(GL11.GL_MODELVIEW...)

My problem is solved!.
Thank you.
Offline ra4king

JGO Kernel


Medals: 506
Projects: 3
Exp: 5 years


I'm the King!


« Reply #4 - Posted 2011-05-27 19:11:52 »

...
because I used BufferUtils.createFloatBuffer() Instead of BufferUtils.createFloatBuffer(),
...
Those are the same thing Tongue

Offline Ushio

Junior Newbie





« Reply #5 - Posted 2011-05-27 20:17:27 »

oh ... miss take! Shocked
I used BufferUtils.createFloatBuffer() Instead of ByteBuffer.allocateDirect(16 * 4).asFloatBuffer();
Offline ra4king

JGO Kernel


Medals: 506
Projects: 3
Exp: 5 years


I'm the King!


« Reply #6 - Posted 2011-05-27 20:50:38 »

Haha alright Smiley

Offline Mike

« JGO Spiffy Duke »


Medals: 149
Projects: 1
Exp: 6 years


Java guru wannabe


« Reply #7 - Posted 2011-05-28 07:58:07 »

Mickelukas, rewind() is not necessary in this case, isn't it?

That's true, I copied the necessary lines from my code and it snuck in Smiley I've adjusted my code so that no one spreads it.

Mike

My current game, Minecraft meets Farmville and goes online Smiley
State of Fortune | Discussion thread @ JGO
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