most opengl code won't work directly because of how we have to set up rendering. just about everything is processed by PGraphics3 before being sent to opengl, meaning that matrices won't be set up correctly for opengl.

ya, anywayz, here's a nice function for you that fixes your code.  It's called "beginRawGL()" and it makes the other 2 squares draw, but breaks the P engine til the end of the draw call. So make sure you do all your P-ing before you go raw. Someone please write a function to get back out from this mode. -JT

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import processing.opengl.*;
import net.java.games.jogl.*;
GL gl;
int p,q;


void beginRawGL(){
/*
 * escape Fry's matrix to make raw jogl calls work
 * til the end of the draw function.
 * special thanks to Flux for showing me this thread.
 * love always, your pal Josh Nimoy
 */
 gl.glViewport(0,0,width,height);
 gl.glMatrixMode(GL.GL_PROJECTION);
 gl.glLoadIdentity();                                                                                                                                                  
 gl.glMatrixMode(GL.GL_MODELVIEW);                                                                                                                                        
 gl.glLoadIdentity();
 gl.glTranslatef(-1,1,0);
 gl.glScalef(2.0/width,-2.0/height,0);
}








void setup()
{
 size(300,300,OPENGL);
 gl=((PGraphicsGL)g).gl;
 buildquad();
}

   
   
void draw()
{
background(0);

//top right
 beginShape(QUADS);
 fill(255);
 vertex(200,0,0);
 vertex(300,0,0);
 vertex(300,100,0);
 vertex(200,100,0);
 endShape();
 gl.glCallList(q);

 beginRawOpenGL();
 
 // top left square
 gl.glBegin(GL.GL_QUADS);
 gl.glColor4f(1.0,1.0,1.0,1.0);
 gl.glVertex3f(0.0,0.0,0.0);
 gl.glVertex3f(100.0,0.0,0.0);
 gl.glVertex3f(100.0,100.0,0.0);
 gl.glVertex3f(0.0,100.0,0.0);
 gl.glEnd();


 gl.glCallList(p);
}

void buildquad()
{
 p=gl.glGenLists(1);
 gl.glNewList(p,GL.GL_COMPILE);
// bottom left
 gl.glBegin(GL.GL_QUADS);
 gl.glColor4f(1.0,1.0,1.0,1.0);
 gl.glVertex3f(0.0,200.0,0.0);
 gl.glVertex3f(100.0,200.0,0.0);
 gl.glVertex3f(100.0,300.0,0.0);
 gl.glVertex3f(0.0,300.0,0.0);
 gl.glEnd();
 gl.glEndList();
 q=gl.glGenLists(1);
 gl.glNewList(q,GL.GL_COMPILE);
//bottom right
 beginShape(QUADS);
 vertex(200,200,0);
 vertex(300,200,0);
 vertex(300,300,0);
 vertex(200,300,0);
 endShape();
 gl.glEndList();
}