How to initializing a GLPBuffer in JOGL2

Hi,

Jzy3d 0.8 (i.e. JOGL1) offers offscreen rendering using GLPBuffer. I wonder how to initialize a GLPBuffer properly in JOGL2:

public void initGLPBuffer(int width, int height) {
        GLCapabilities caps = org.jzy3d.global.Settings.getInstance().getGLCapabilities();
        caps.setDoubleBuffered(false);
        glpBuffer = GLDrawableFactory.getFactory(GLProfile.getDefault()).createGLPbuffer(null, caps, null, width,height, null);
        //glpBuffer = GLDrawableFactory.getDesktopFactory().createGLPbuffer(null, caps, null, width, height, null);
               
        glpBuffer.addGLEventListener(renderer);
        glContext =  glpBuffer.createContext(null);
        glContext.makeCurrent();
        glpBuffer.createContext(glContext);
        //renderer.reshape(glpBuffer, 0, 0, width, height);
}

Although I properly define dimensions (400*400), when starting this way, I got:

Exception in thread "main" java.lang.IllegalArgumentException: Width (0) and height (0) must be > 0
        at java.awt.image.SampleModel.<init>(Unknown Source)
        at java.awt.image.ComponentSampleModel.<init>(Unknown Source)
        at java.awt.image.PixelInterleavedSampleModel.<init>(Unknown Source)
        at java.awt.image.Raster.createInterleavedRaster(Unknown Source)
        at java.awt.image.Raster.createInterleavedRaster(Unknown Source)
        at java.awt.image.BufferedImage.<init>(Unknown Source)
        at com.jogamp.opengl.util.awt.Screenshot.readToBufferedImage(Screenshot.java:256)
        at com.jogamp.opengl.util.awt.Screenshot.readToBufferedImage(Screenshot.java:218)
        at com.jogamp.opengl.util.awt.Screenshot.readToBufferedImage(Screenshot.java:192)
        at org.jzy3d.plot3d.rendering.view.Renderer3d.display(Renderer3d.java:87)
        at jogamp.opengl.GLDrawableHelper.displayImpl(GLDrawableHelper.java:189)
        at jogamp.opengl.GLDrawableHelper.display(GLDrawableHelper.java:177)
        at jogamp.opengl.GLPbufferImpl$DisplayAction.run(GLPbufferImpl.java:300)
        at jogamp.opengl.GLDrawableHelper.invokeGLImpl(GLDrawableHelper.java:425)
        at jogamp.opengl.GLDrawableHelper.invokeGL(GLDrawableHelper.java:364)
        at jogamp.opengl.GLPbufferImpl.invokeGL(GLPbufferImpl.java:286)
        at jogamp.opengl.GLPbufferImpl.display(GLPbufferImpl.java:149)
        at org.jzy3d.plot3d.rendering.canvas.OffscreenCanvasNotWorking.screenshot(OffscreenCanvasNotWorking.java:82)
        at org.jzy3d.demos.offscreen.WireSurfaceOffscreenDemo.createScreenshot(WireSurfaceOffscreenDemo.java:44)
        at org.jzy3d.demos.offscreen.WireSurfaceOffscreenDemo.init(WireSurfaceOffscreenDemo.java:37)
        at org.jzy3d.demos.offscreen.WireSurfaceOffscreenDemo.main(WireSurfaceOffscreenDemo.java:30)

I tried calling reshape(...) on my GLEventListener, but once called, GLAutoDrawable.getGL() returns null when passing the GLPBuffer as GLAutoDrawable, so the reshape method of my GLEventListener can't do its job.

I tried using GLProfile.getGL2GL3() as profile, but it does not work better.
I also tried using GLDrawableFactory.getDesktopFactory() to build the GLPBuffer with the same problems.

Thanks in advance for your suggestions...

Martin

Hi

Maybe you should rather use Sven's new API to manipulate FBOs.

Does it mean GLPBuffer is not usable anymore?

On 08/24/2012 07:20 PM, Martin [via jogamp] wrote:
> Does it mean GLPBuffer is not usable anymore?
>
It is .. where it is supported :)

However, just do as the exception says .. use a valid size > 0x0.

Pbuffer and FBO GLAutoDrawable examples are within the JOGL unit test
using the GLDrawableFactory directly.

~Sven

Sven Gothel wrote

However, just do as the exception says .. use a valid size > 0x0.

That was already done.

Very surprised to see that following code is working:

protected void initGLPBuffer(int width, int height) {
        GLCapabilities caps = org.jzy3d.global.Settings.getInstance().getGLCapabilities();
        caps.setDoubleBuffered(false);
        if (!GLDrawableFactory.getFactory(caps.getGLProfile()).canCreateGLPbuffer(null))
            throw new RuntimeException("No pbuffer support");

        glpBuffer = GLDrawableFactory.getFactory(caps.getGLProfile()).createGLPbuffer(null, caps, null, width, height, null);
        glpBuffer.addGLEventListener(renderer);
    }

Don't know what I missed before :)