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Index › Programming Questions & Help › OpenGL and 3D Libraries › how to use glDrawPixels();
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how to use glDrawPixels();? (Read 2730 times)
dam
how to use glDrawPixels();?
Aug 18th, 2009, 3:55pm  
please somebody have a simple exemple to use glDrawPixels();?

Because a try to use set() in OpenGl but it is very slow and crapy...


Thank you very munch...
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V
Re: how to use glDrawPixels();?
Reply #1 - Aug 18th, 2009, 5:40pm  
http://msdn2.microsoft.com/en-us/library/ms537062.aspx

gl.glDrawPixels( width, height, GL.GL_RGBA, GL.GL_UNSIGNED_BYTE, IntBuffer.wrap(tmpPixels) );


that should work
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Victor Martins | www.pixelnerve.com/v
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dam
I'm sorry, but.
Reply #2 - Aug 19th, 2009, 4:23am  
Have you a small exemple, with mouseX and mouseY by exemple...
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V
Re: how to use glDrawPixels();?
Reply #3 - Aug 19th, 2009, 4:31am  
its simple. i assume you have a reference to the GL object from processing since you are asking about using opengl functions..

so just load a PImage, and use the line in the post above.

GL gl;
PImage img;

void setup()
{
 img = loadImage( filename );
}

void draw()
{
 gl = ((PGraphicsOpenGL)g).beginGL();

 // pass the pixels from pimage.
gl.glDrawPixels( width, height, GL.GL_RGBA, GL.GL_UNSIGNED_BYTE, IntBuffer.wrap(img.pixels) );

 ((PGraphicsOpenGL)_parent.g).endGL();
}
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Victor Martins | www.pixelnerve.com/v
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dam
Re: how to use glDrawPixels();?
Reply #4 - Aug 19th, 2009, 4:52am  
I try to make this code : but, I have "Cannot find anything named "_parent""...

No i'm a beginner for Opengl, that why is a little bit hard... But a try!
Smiley

Thank you for your help.

/////////////////////////////////////////////////////////////////////////
import processing.opengl.*;
import javax.media.opengl.*;
import javax.media.opengl.glu.*;

GL gl;
PImage img;

void setup()
{
 size(800,600,OPENGL);
 img = loadImage("yo.png");
}

void draw()
{
 gl = ((PGraphicsOpenGL)_parent.g).beginGL();

 // pass the pixels from pimage.
 gl.glDrawPixels( width, height, GL.GL_RGBA, GL.GL_UNSIGNED_BYTE, IntBuffer.wrap(img.pixels) );

 (PGraphicsOpenGL.g).endGL();
}
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V
Re: how to use glDrawPixels();?
Reply #5 - Aug 19th, 2009, 4:54am  
sorry, i've copied it from my framework and didn't see that..

just remove the "parent." part.



gl = ((PGraphicsOpenGL)g).beginGL();
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Victor Martins | www.pixelnerve.com/v
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dam
Re: how to use glDrawPixels();?
Reply #6 - Aug 19th, 2009, 4:57am  
Yes, now i hope the last, have a problem with the IntBuffer. "cannot find anything named IntBuffer".

Re-thank.
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V
Re: how to use glDrawPixels();?
Reply #7 - Aug 19th, 2009, 4:58am  
u need to import to package that has it.. google for it
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Victor Martins | www.pixelnerve.com/v
WWW  
dam
Re: how to use glDrawPixels();?
Reply #8 - Aug 19th, 2009, 5:03am  
ok, package it's probaly,

import javax.nio.*;

it have IntBuffer, but i have expecting EOF, found 'PImage';

That strange..

////the code////////////

import processing.opengl.*;
import javax.media.opengl.*;
import javax.media.opengl.glu.*;
import javax.nio.*

GL gl;
PImage img;


void setup()
{
 size(800,600,OPENGL);
 img = loadImage("yo.png");
}


void draw()
{
 gl = ((PGraphicsOpenGL)g).beginGL();

 // pass the pixels from pimage.
 gl.glDrawPixels( width, height, GL.GL_RGBA, GL.GL_UNSIGNED_BYTE, IntBuffer.wrap(img.pixels) );

 (PGraphicsOpenGL.g).endGL();
}

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dam
Re: how to use glDrawPixels();?
Reply #9 - Aug 19th, 2009, 5:23am  
That right.

thank!

//////////////////////////////////////////////////
import processing.opengl.*;
import javax.media.opengl.*;
import javax.media.opengl.glu.*;
import java.nio.*;

PImage img;
GL gl;


void setup()
{
 size(800,600,OPENGL);
 img = loadImage("yo.png");
}


void draw()
{
 gl = ((PGraphicsOpenGL)g).beginGL();

 // pass the pixels from pimage.
 gl.glDrawPixels( width, height, GL.GL_RGBA, GL.GL_UNSIGNED_BYTE, IntBuffer.wrap(img.pixels));


 ((PGraphicsOpenGL)g).endGL();
}
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