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Mask? (Read 888 times)
beachmeat
Mask?
Oct 12th, 2005, 12:44pm  
Hmm,

obviously there is something special about openGL and mask. I found some threads where people have problems using mask in OPENGL, so do I.
Unfortunately I couldnt find a solution of how to get this to work, which is common workaround to have semi-transparent masks over images in openGL?
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fry
Re: Mask?
Reply #1 - Oct 12th, 2005, 3:53pm  
perhaps be more specific / post some code that doesn't work?

be sure to call updatePixels() on an image after using mask(), this should probably be done by mask() itself but may not be at the current time.
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beachmeat
Re: Mask?
Reply #2 - Oct 12th, 2005, 5:21pm  
Hi,

please check out:
http://www.dr3.de/tmp/mask_test.zip

The code is the following:
Code:

import processing.opengl.*;

int[] maske;
PImage img;
PImage imgBgr;

void setup()
{
  size(200,150, OPENGL); // WORKS IN P3D!
  framerate(120);
  maske   = new int[width*height];
  img     = loadImage("pic.jpg"); 
  imgBgr  = loadImage("test.jpg"); 
   
  for(int i=0;i<width*height;i++)
    maske[i] = 0;
}

void draw()
{
  image(imgBgr,0,0);
  
  img.mask(maske);
  img.updatePixels();
  image(img, 0, 0); 
}

void mouseMoved()
{
  maske[constrain( int( (mouseY-1)*width + mouseX), 0, width*height)] = 255;
}


So I am displaying and image, and then wanna display a masked one on top of it. If you switch to P3D, it works.

Any idea of workaround (provided I am NOT the bug) would be greatly appreciated.

Manuel
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