JOGL Double Buffering

Question

What is eligible way to implement double buffering in JOGL (Java OpenGL)?

I am trying to do that by the following code:

...    

/** Creating canvas. */
GLCapabilities capabilities = new GLCapabilities();
capabilities.setDoubleBuffered(true);
GLCanvas canvas = new GLCanvas(capabilities);

...

/** Function display(…), which draws a white Rectangle on a black background. */
public void display(GLAutoDrawable drawable) {
    drawable.swapBuffers();

    gl = drawable.getGL();

    gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
    gl.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);

    gl.glColor3f(1.0f, 1.0f, 1.0f);

    gl.glBegin(GL.GL_POLYGON);
    gl.glVertex2f(-0.5f, -0.5f);
    gl.glVertex2f(-0.5f, 0.5f);
    gl.glVertex2f(0.5f, 0.5f);
    gl.glVertex2f(0.5f, -0.5f);
    gl.glEnd();
}

...

/** Other functions are empty. */

Questions:

— When I'm resizing the window, I usually get flickering. As I see it, I have a mistake in my double buffering implementation.

— I have doubt, where I must place function swapBuffers — before or after (as many sources says) the drawing? As you noticed, I use function swapBuffers (drawable.swapBuffers()) before drawing a rectangle. Otherwise, I'm getting a noise after resize. So what is an appropriate way to do that?

Including or omitting the line capabilities.setDoubleBuffered(true) does not make any effect.

Answer 1

Here's an example of double-buffered animation using JOGL:

http://www.java-tips.org/other-api-tips/jogl/how-to-implement-a-simple-double-buffered-animation-with-mouse-e.html

Try instead of calling swapBuffers(), at the end of display(...) call:

gl.glFlush();

It's been a while since I've done anything with JOGL; hope this helps.

Answer 2

If JOGL is like the C/C++ version:

RMorrisey and the sample code is incorrect in stating the use of glFlush.

The swapBuffers function must go at the end of the drawing.

To confirm this: have the shapes do animation very quickly and watch for tearing. If you get tearing then you are doing a single draw, if you don't then you are using double buffering.