Load a texture with PGraphics

paolofuse

I'm trying to load a texture inside a PGraphics:

PGraphics offscreen;

void setup()
{
        size(1200, 800, OPENGL);
        offscreen = createGraphics(600, 400, OPENGL);
        ...
        PGL pgl = offscreen.beginPGL();
        IntBuffer textureID = IntBuffer.allocate(1);
    ->  pgl.genTextures(1, textureID);
        ...
        offscreen.endPGL();
}

but I get a NullException error in the indicated line. Any suggestion?

Thanks in advance.