How to achieve full anti-aliasing while doing native OpenGL calls.

capturevision

Hello,

Using P5 2.1.1, I used to setup antialising with smooth(32).. However, as soon as I make a direct OpenGL call (like glTranslate3f, etc..), the sketch refuses to run and antialiasing is bad..

Though, using smooth(); alone lets the sketch work but full antialiasing is not on..

My question is how (P5 code and/or OpenGL code) to achieve full antialiasing while making direct OpenGL call in the sketch ?

capturevision

@codeanticode, @gotoloop, @poersch, any idea ?

codeanticode

smooth() sets an antialiased opengl context where your low-level opengl calls should draw to as well, so I'm surprised that you don't get antialiasing. Maybe if you post some code would be easier to find the problem.

capturevision

Sure..

Here is an example code :

import com.jogamp.opengl.util.gl2.GLUT;
import java.nio.*;
import java.util.*;
import javax.media.opengl.GL2;
import javax.media.opengl.glu.GLU;

 PJOGL   pgl;
 GL2     gl;
 GLU     glu;  
 GLUT    glut;
float angle = .67;
void setup() 
{  

  size(1280, 720, P3D);
  pgl  = (PJOGL) beginPGL();
  glu  = pgl.glu;
  glut = new GLUT();
  gl   = GLU.getCurrentGL().getGL2();

  gl.setSwapInterval(1);  
  gl.glShadeModel(GL2.GL_SMOOTH);                                  
  gl.glClearDepth(1.0f);                                           
  gl.glEnable(GL2.GL_DEPTH_TEST);                                  
  gl.glDepthFunc(GL2.GL_LEQUAL);                                   
  gl.glHint(GL2.GL_PERSPECTIVE_CORRECTION_HINT, GL2.GL_NICEST);    

  // OFFENDING LINE ! runs with just "smooth();", but not "smooth(32)",
  // as soon as I use OpenGL objects..
  smooth(32);
}

void draw() 
{ 
  background(50);

  gl.glPushMatrix();
  gl.glTranslatef(displayWidth/2, displayHeight/2, 0);
  gl.glRotatef(angle,0,1,0); 
  gl.glRotatef(angle * 1.02 ,1,0,0);  
  gl.glScalef(1,-1,1);
  gl.glScalef(200,200,200);

  drawGlCube();
  gl.glPopMatrix();

}

public void drawGlCube()
{
  gl.glBegin(GL2.GL_QUADS);

  gl.glNormal3f(0,0,-1);

  gl.glTexCoord2f(0,0);
  gl.glVertex3f(-1,1,-1);
  gl.glTexCoord2f(0,1);
  gl.glVertex3f(-1,-1,-1);
  gl.glTexCoord2f(1,1);
  gl.glVertex3f(1,-1,-1);
  gl.glTexCoord2f(1,0);
  gl.glVertex3f(1,1,-1);


  gl.glNormal3f(1,0,0);  

  gl.glTexCoord2f(1,1);
  gl.glVertex3f(1,-1,1);
  gl.glTexCoord2f(1,0);
  gl.glVertex3f(1,1,1);
  gl.glTexCoord2f(0,0);
  gl.glVertex3f(1,1,-1);
  gl.glTexCoord2f(0,1);
  gl.glVertex3f(1,-1,-1);

  gl.glNormal3f(0,0,1);

  gl.glTexCoord2f(1,1);
  gl.glVertex3f(-1,-1,1);
  gl.glTexCoord2f(1,0);
  gl.glVertex3f(-1,1,1);
  gl.glTexCoord2f(0,0);
  gl.glVertex3f(1,1,1);
  gl.glTexCoord2f(0,1);
  gl.glVertex3f(1,-1,1);


  gl.glNormal3f(-1,0,0);

  gl.glTexCoord2f(0,0);
  gl.glVertex3f(-1,1,1);
  gl.glTexCoord2f(0,1);
  gl.glVertex3f(-1,-1,1);
  gl.glTexCoord2f(1,1);
  gl.glVertex3f(-1,-1,-1);
  gl.glTexCoord2f(1,0);
  gl.glVertex3f(-1,1,-1);


  gl.glNormal3f(0,1,0);

  gl.glTexCoord2f(0,0);
  gl.glVertex3f(1,1,1);
  gl.glTexCoord2f(0,1);
  gl.glVertex3f(-1,1,1);
  gl.glTexCoord2f(1,1);
  gl.glVertex3f(-1,1,-1);
  gl.glTexCoord2f(1,0);
  gl.glVertex3f(1,1,-1);


  gl.glNormal3f(0,-1,0);

  gl.glTexCoord2f(0,0);
  gl.glVertex3f(-1,-1,1);
  gl.glTexCoord2f(0,1);
  gl.glVertex3f(1,-1,1);
  gl.glTexCoord2f(1,1);
  gl.glVertex3f(1,-1,-1);
  gl.glTexCoord2f(1,0);
  gl.glVertex3f(-1,-1,-1);

  gl.glEnd();
}

When I try to run this, I get a NullPointerException with the following call stack dump :

    java.lang.NullPointerException
        at processing.mode.java.runner.Runner.findException(Runner.java:926)
        at processing.mode.java.runner.Runner.reportException(Runner.java:871)
        at processing.mode.java.runner.Runner.exceptionEvent(Runner.java:797)
        at processing.mode.java.runner.Runner$2.run(Runner.java:686)

When I use smooth(), everything runs fine, but as soon as I write smooth(32) and use OpenGL code afterwards, I get this exception.

Any idea where it may come from ?