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Demonstration of the usage of the accumulation buffer to do full-scene antialiasing on a scene E-mail
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The example demonstrates the use the accumulation buffer to do full-scene antialiasing on a scene with perspective projection. The example is ported from C examples in the OpenGL Programming Guide (known as the "red book").


Image

-> Copyright and Permission Notice

package glredbook10;

import java.awt.event.*;

import javax.swing.*;

import javax.media.opengl.*;
import com.sun.opengl.util.*;

/**
 * Use the accumulation buffer to do full-scene antialiasing on a scene with
 * perspective projection.
 
 @author Kiet Le (Java port)
 */
public class accpersp
  extends JFrame
    implements GLEventListener, KeyListener
{
  private GLCapabilities caps;
  private GLCanvas canvas;
  private GLUT glut;

  private static final int ACSIZE = 8;


  /* 2 jitter points */
  jitter_point j2[] =
  new jitter_point(0.246490f0.249999f),
    new jitter_point(-0.246490f, -0.249999f) };

  /* 3 jitter points */
  jitter_point j3[] =
  new jitter_point(-0.373411, -0.250550),//
    new jitter_point(0.2562630.368119)//
    new jitter_point(0.117148, -0.117570) };

  /* 4 jitter points */
  jitter_point j4[] =
  new jitter_point(-0.2081470.353730),
    new jitter_point(0.203849, -0.353780),
    new jitter_point(-0.292626, -0.149945),
    new jitter_point(0.2969240.149994) };

  /* 8 jitter points */
  jitter_point j8[] =
  new jitter_point(-0.3348180.435331),
    new jitter_point(0.286438, -0.393495),
    new jitter_point(0.4594620.141540),
    new jitter_point(-0.414498, -0.192829),
    new jitter_point(-0.1837900.082102),
    new jitter_point(-0.079263, -0.317383),
    new jitter_point(0.1022540.299133)new jitter_point(0.164216, -0.054399) };

  /* 15 jitter points */
  jitter_point j15[] =
  new jitter_point(0.2855610.188437),
    new jitter_point(0.360176, -0.065688),
    new jitter_point(-0.1117510.275019),
    new jitter_point(-0.055918, -0.215197),
    new jitter_point(-0.080231, -0.470965),
    new jitter_point(0.1387210.409168)new jitter_point(0.3841200.458500),
    new jitter_point(-0.4549680.134088),
    new jitter_point(0.179271, -0.331196),
    new jitter_point(-0.307049, -0.364927),
    new jitter_point(0.105354, -0.010099),
    new jitter_point(-0.1541800.021794),
    new jitter_point(-0.370135, -0.116425),
    new jitter_point(0.451636, -0.300013),
    new jitter_point(-0.3706100.387504) };

  /* 24 jitter points */
  jitter_point j24[] =
  new jitter_point(0.0302450.136384),
    new jitter_point(0.018865, -0.348867),
    new jitter_point(-0.350114, -0.472309),
    new jitter_point(0.2221810.149524),
    new jitter_point(-0.393670, -0.266873),
    new jitter_point(0.4045680.230436)new jitter_point(0.0983810.465337),
    new jitter_point(0.4626710.442116),
    new jitter_point(0.400373, -0.212720),
    new jitter_point(-0.4099880.263345),
    new jitter_point(-0.115878, -0.001981),
    new jitter_point(0.348425, -0.009237),
    new jitter_point(-0.4640160.066467),
    new jitter_point(-0.138674, -0.468006),
    new jitter_point(0.144932, -0.022780),
    new jitter_point(-0.2501950.150161),
    new jitter_point(-0.181400, -0.264219),
    new jitter_point(0.196097, -0.234139),
    new jitter_point(-0.311082, -0.078815),
    new jitter_point(0.2683790.366778),
    new jitter_point(-0.0406010.327109),
    new jitter_point(-0.2343920.354659),
    new jitter_point(-0.003102, -0.154402),
    new jitter_point(0.297997, -0.417965) };

  /* 66 jitter points */
  jitter_point j66[] =
  new jitter_point(0.266377, -0.218171),
    new jitter_point(-0.170919, -0.429368),
    new jitter_point(0.047356, -0.387135),
    new jitter_point(-0.4300630.363413),
    new jitter_point(-0.221638, -0.313768),
    new jitter_point(0.124758, -0.197109),
    new jitter_point(-0.4000210.482195),
    new jitter_point(0.2478820.152010),
    new jitter_point(-0.286709, -0.470214),
    new jitter_point(-0.4267900.004977),
    new jitter_point(-0.361249, -0.104549),
    new jitter_point(-0.0406430.123453),
    new jitter_point(-0.1892960.438963),
    new jitter_point(-0.453521, -0.299889),
    new jitter_point(0.408216, -0.457699),
    new jitter_point(0.328973, -0.101914),
    new jitter_point(-0.055540, -0.477952),
    new jitter_point(0.1944210.453510)//
    new jitter_point(0.4040510.224974)//
    new jitter_point(0.3101360.419700),
    new jitter_point(-0.0217430.403898),
    new jitter_point(-0.4662100.248839),
    new jitter_point(0.3413690.081490),
    new jitter_point(0.124156, -0.016859),
    new jitter_point(-0.461321, -0.176661),
    new jitter_point(0.0132100.234401),
    new jitter_point(0.174258, -0.311854),
    new jitter_point(0.2940610.263364),
    new jitter_point(-0.1148360.328189),
    new jitter_point(0.041206, -0.106205),
    new jitter_point(0.0792270.345021),
    new jitter_point(-0.109319, -0.242380),
    new jitter_point(0.425005, -0.332397),
    new jitter_point(0.0091460.015098),
    new jitter_point(-0.339084, -0.355707),
    new jitter_point(-0.224596, -0.189548),
    new jitter_point(0.0834750.117028),
    new jitter_point(0.295962, -0.334699),
    new jitter_point(0.4529980.025397),
    new jitter_point(0.206511, -0.104668),
    new jitter_point(0.447544, -0.096004),
    new jitter_point(-0.108006, -0.002471),
    new jitter_point(-0.3808100.130036),
    new jitter_point(-0.2424400.186934),
    new jitter_point(-0.2003630.070863),
    new jitter_point(-0.344844, -0.230814),
    new jitter_point(0.4086600.345826),
    new jitter_point(-0.2330160.305203),
    new jitter_point(0.158475, -0.430762),
    new jitter_point(0.4869720.139163),
    new jitter_point(-0.3016100.009319),
    new jitter_point(0.282245, -0.458671),
    new jitter_point(0.4820460.443890),
    new jitter_point(-0.1215270.210223),
    new jitter_point(-0.477606, -0.424878),
    new jitter_point(-0.083941, -0.121440),
    new jitter_point(-0.3457730.253779),
    new jitter_point(0.2346460.034549),
    new jitter_point(0.394102, -0.210901),
    new jitter_point(-0.3125710.397656),
    new jitter_point(0.2009060.333293),
    new jitter_point(0.018703, -0.261792),
    new jitter_point(-0.209349, -0.065383),
    new jitter_point(0.0762480.478538),
    new jitter_point(-0.073036, -0.355064),
    new jitter_point(0.1450870.221726) };

  public accpersp()
  {
    super("accpersp");

    caps = new GLCapabilities();
    caps.setAccumBlueBits(16);
    caps.setAccumGreenBits(16);
    caps.setAccumRedBits(16);
    System.out.println(caps.toString());
    canvas = new GLCanvas(caps);
    canvas.addGLEventListener(this);
    canvas.addKeyListener(this);

    getContentPane().add(canvas);
  }

  public void run()
  {
    setSize(250250);
    setLocationRelativeTo(null);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setVisible(true);
    canvas.requestFocusInWindow();
  }

  public static void main(String[] args)
  {
    new accpersp().run();
  }

  public void init(GLAutoDrawable drawable)
  {
    GL gl = drawable.getGL();
    glut = new GLUT();
    //
    float mat_ambient[] new float[]
    1.0f1.0f1.0f1.0f };
    float mat_specular[] new float[]
    1.0f1.0f1.0f1.0f };
    float light_position[] new float[]
    0.0f0.0f10.0f1.0f };
    float lm_ambient[] new float[]
    0.2f0.2f0.2f1.0f };

    gl.glMaterialfv(GL.GL_FRONT, GL.GL_AMBIENT, mat_ambient, 0);
    gl.glMaterialfv(GL.GL_FRONT, GL.GL_SPECULAR, mat_specular, 0);
    gl.glMaterialf(GL.GL_FRONT, GL.GL_SHININESS, 50.0f);
    gl.glLightfv(GL.GL_LIGHT0, GL.GL_POSITION, light_position, 0);
    gl.glLightModelfv(GL.GL_LIGHT_MODEL_AMBIENT, lm_ambient, 0);

    gl.glEnable(GL.GL_LIGHTING);
    gl.glEnable(GL.GL_LIGHT0);
    gl.glEnable(GL.GL_DEPTH_TEST);
    gl.glShadeModel(GL.GL_FLAT);

    gl.glClearColor(0.0f0.0f0.0f0.0f);
    gl.glClearAccum(0.0f0.0f0.0f0.0f);
  }

  public void display(GLAutoDrawable drawable)
  {
    GL gl = drawable.getGL();
    //
    int viewport[] new int[4];
    int jitter;

    gl.glGetIntegerv(GL.GL_VIEWPORT, viewport, 0);

    gl.glClear(GL.GL_ACCUM_BUFFER_BIT);
    for (jitter = 0; jitter < ACSIZE; jitter++)
    {
      gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
      accPerspective(gl, 50.0(doubleviewport[2(doubleviewport[3],
          1.015.0, j8[jitter].x, j8[jitter].y, 0.00.01.0);
      displayObjects(gl);
      gl.glAccum(GL.GL_ACCUM, 1.0f / ACSIZE);
    }
    gl.glAccum(GL.GL_RETURN, 1.0f);
    gl.glFlush();
  }

  public void reshape(GLAutoDrawable drawable, int x, int y, int w, int h)
  {
    GL gl = drawable.getGL();
    //
    gl.glViewport(x, y, w, h);
  }

  public void displayChanged(GLAutoDrawable drawable, boolean modeChanged,
      boolean deviceChanged)
  {

  }

  /*
   * accFrustum() The first 6 arguments are identical to the glFrustum() call.
   * pixdx and pixdy are anti-alias jitter in pixels. Set both equal to 0.0 for
   * no anti-alias jitter. eyedx and eyedy are depth-of field jitter in pixels.
   * Set both equal to 0.0 for no depth of field effects. focus is distance from
   * eye to plane in focus. focus must be greater than, but not equal to 0.0.
   * Note that accFrustum() calls glTranslatef(). You will probably want to
   * insure that your ModelView matrix has been initialized to identity before
   * calling accFrustum().
   */
  private void accFrustum(GL gl, double left, double right, double bottom,
      double top, double near, double far, double pixdx, double pixdy,
      double eyedx, double eyedy, double focus)
  {
    double xwsize, ywsize;
    double dx, dy;
    int viewport[] new int[4];

    gl.glGetIntegerv(GL.GL_VIEWPORT, viewport, 0);

    xwsize = right - left;
    ywsize = top - bottom;

    dx = -(pixdx * xwsize / (doubleviewport[2+ eyedx * near / focus);
    dy = -(pixdy * ywsize / (doubleviewport[3+ eyedy * near / focus);

    gl.glMatrixMode(GL.GL_PROJECTION);
    gl.glLoadIdentity();
    gl.glFrustum(left + dx, right + dx, bottom + dy, top + dy, near, far);
    gl.glMatrixMode(GL.GL_MODELVIEW);
    gl.glLoadIdentity();
    gl.glTranslatef((float-eyedx, (float-eyedy, 0.0f);
  }

  /*
   * accPerspective() The first 4 arguments are identical to the
   * gluPerspective() call. pixdx and pixdy are anti-alias jitter in pixels. Set
   * both equal to 0.0 for no anti-alias jitter. eyedx and eyedy are depth-of
   * field jitter in pixels. Set both equal to 0.0 for no depth of field
   * effects. focus is distance from eye to plane in focus. focus must be
   * greater than, but not equal to 0.0. Note that accPerspective() calls
   * accFrustum().
   */
  void accPerspective(GL gl, double fovy, double aspect, double near,
      double far, double pixdx, double pixdy, double eyedx, double eyedy,
      double focus)
  {
    double fov2, left, right, bottom, top;

    fov2 = ((fovy * Math.PI180.02.0;

    top = near / (Math.cos(fov2/ Math.sin(fov2));
    bottom = -top;

    right = top * aspect;
    left = -right;

    accFrustum(gl, left, right, bottom, top, near, far, pixdx, pixdy, eyedx,
        eyedy, focus);
  }

  private void displayObjects(GL gl)
  {
    float torus_diffuse[] new float[]
    0.7f0.7f0.0f1.0f };
    float cube_diffuse[] new float[]
    0.0f0.7f0.7f1.0f };
    float sphere_diffuse[] new float[]
    0.7f0.0f0.7f1.0f };
    float octa_diffuse[] new float[]
    0.7f0.4f0.4f1.0f };

    gl.glPushMatrix();
    gl.glTranslatef(0.0f0.0f, -5.0f);
    gl.glRotatef(30.0f1.0f0.0f0.0f);

    gl.glPushMatrix();
    gl.glTranslatef(-0.80f0.35f0.0f);
    gl.glRotatef(100.0f1.0f0.0f0.0f);
    gl.glMaterialfv(GL.GL_FRONT, GL.GL_DIFFUSE, torus_diffuse, 0);
    glut.glutSolidTorus(0.2750.851616);
    gl.glPopMatrix();

    gl.glPushMatrix();
    gl.glTranslatef(-0.75f, -0.50f0.0f);
    gl.glRotatef(45.0f0.0f0.0f1.0f);
    gl.glRotatef(45.0f1.0f0.0f0.0f);
    gl.glMaterialfv(GL.GL_FRONT, GL.GL_DIFFUSE, cube_diffuse, 0);
    glut.glutSolidCube(1.5f);
    gl.glPopMatrix();

    gl.glPushMatrix();
    gl.glTranslatef(0.75f0.60f0.0f);
    gl.glRotatef(30.0f1.0f0.0f0.0f);
    gl.glMaterialfv(GL.GL_FRONT, GL.GL_DIFFUSE, sphere_diffuse, 0);
    glut.glutSolidSphere(1.01616);
    gl.glPopMatrix();

    gl.glPushMatrix();
    gl.glTranslatef(0.70f, -0.90f0.25f);
    gl.glMaterialfv(GL.GL_FRONT, GL.GL_DIFFUSE, octa_diffuse, 0);
    glut.glutSolidOctahedron();
    gl.glPopMatrix();

    gl.glPopMatrix();
  }

  public void keyTyped(KeyEvent key)
  {

  }

  public void keyPressed(KeyEvent key)
  {
     switch (key.getKeyCode()) {
      case KeyEvent.VK_ESCAPE:
        System.exit(0);
        break;

      default:
        break;
    }
  }

  public void keyReleased(KeyEvent key)
  {
  }

  class jitter_point
  {
    private static final int MAX_SAMPLES = 66;
    float x, y;

    public jitter_point(double x, double y)
    {
      this.x = (floatx;
      this.y = (floaty;
    }
  }
}

Source: Kiet Le's The Red Book Examples using JOGL


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