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OpenGL SWT Snippet render thread [message #450744]

Thu, 17 February 2005 14:59

Asim Ullah

Messages: 24
Registered: July 2009

Junior Member

In the OpenGL SWT Snippet (Snippet174.java) a separate thread
calls render every 50ms. I thought at first that this might be an
animation thread, but the Quad that gets rendered appears to be static.
(The OpenGLExample appears to follow the same pattern.)

Is there a reason for constantly rendering in this way, even though
the window is not being damage/overlapped, as opposed to calling render
through a PaintEvent? E.g

canvas.addPaintListener(new PaintListener() {
public void paintControl(PaintEvent e) {
render();
context.swapBuffers();
}
});

Trying this out on Windows (and commenting out the Runnable) seems
to work fine. Perhaps the Runnable is need for other platforms?

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Re: OpenGL SWT Snippet render thread [message #450746 is a reply to message #450744]

Thu, 17 February 2005 15:41

Stephan Michels

Messages: 23
Registered: July 2009

Junior Member

Asim Ullah wrote:

> In the OpenGL SWT Snippet (Snippet174.java) a separate thread
> calls render every 50ms. I thought at first that this might be an
> animation thread, but the Quad that gets rendered appears to be static.
> (The OpenGLExample appears to follow the same pattern.)

> Is there a reason for constantly rendering in this way, even though
> the window is not being damage/overlapped, as opposed to calling render
> through a PaintEvent? E.g

> canvas.addPaintListener(new PaintListener() {
> public void paintControl(PaintEvent e) {
> render();
> context.swapBuffers();
> }
> });

If I remind me correctly this doesn't for GTK, because the empty GC repaint
this area after the GLContext were rendered.

I use a very dirty and ugly hack to get the expose event to redraw the
GLContext by overriding gtk_expose_event(int, int) method. I wish there
will be a better method to repaint the GLContext.

Stephan Michels

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