hi all ...

i'm trying to work a bit with proce55ing but calling javax.media.opengl functions and it works great for displaying in OpenGL but when i tried to read pixels from the OpenGL framebuffer ... i got this :

javax.media.openGL.GLException : Required extensions not available to call this function.

could anybody light me if i can "include" this extensions to be able to call this function ? i've an alternative way of doing this trough loadPixels()..pixels[i] but i need to work it out with glReadPixels ...

any information about this "extensions" required ?

i include in case its usefull some portions of code where i try to read a pixel from the screen ...

GLContext GLCONT;
 GLCONT = pgl.canvas.getContext();
 GLCONT.makeCurrent();
 gl.glFlush();
 gl.glReadBuffer(gl.GL_FRONT);
 gl.glFinish();
 gl.glReadBuffer(gl.GL_FRONT);
 gl.glPixelStorei(gl.GL_INT,1);
 
 long data=0;
 gl.glReadPixels(0,0,0,0,gl.GL_RGB,gl.GL_INT,data);
 println(data);

////////

and that's how i inicialize OpenGL in setup

.../...

 pgl = (PGraphicsOpenGL) g;
 gl = pgl.beginGL();
 gl.glShadeModel(gl.GL_SMOOTH);
 pgl.beginDraw();
 gl.glClearColor(0.0,0.0,255.0,0.0);

.../...

thanks for any info

e*