[gl4java-usergroup] Problem reading frame buffer.

[Erwin V. <er...@cs...>]

Hello all,

I've got a problem reading the OpenGL frame buffer using GL4Java. In my
program (the Java MD3 Model Viewer - http://fragland.net/md3view) I use the
following piece of code to do this:


public class MD3GLCanvas extends GLAnimCanvas {

  ...

  public void dumpCanvasToTGA(String filename) throws java.io.IOException {
   byte[] pixels=new byte[this.getWidth() * this.getHeight() * 3];

   sDisplay(); // make sure the image on the canvas is properly drawn!

  // get viewport data
  gl.glReadBuffer(GL_BACK);
  gl.glReadPixels(0, 0, this.getWidth(), this.getHeight(), GL_RGB,
GL_UNSIGNED_BYTE, pixels);

  ...

  }
}

This works just fine, but from time to time the retreived image data is
screwed up (look at the example I've attached to this mail). My guess is
that I should somehow synchronise my reading of the frame buffer?

Any ideas what might be causing this or how I can fix it?

Erwin 'KLR8' Vervaet
er...@cs...