gov/nasa/worldwind/BasicFrameController.java

   1 /*
   2 Copyright (C) 2001, 2006 United States Government
   3 as represented by the Administrator of the
   4 National Aeronautics and Space Administration.
   5 All Rights Reserved.
   6 */
   7 package gov.nasa.worldwind;
   8
   9 import javax.media.opengl.*;
  10
  11 /**
  12  * @author Tom Gaskins
  13  * @version $Id: BasicFrameController.java 1941 2007-06-02 08:52:28Z tgaskins $
  14  */
  15 public class BasicFrameController implements FrameController
  16 {
  17     public void initializeFrame(DrawContext dc)
  18     {
  19         if (null == dc)
  20         {
  21             String msg = WorldWind.retrieveErrMsg("nullValue.DrawContextIsNull");
  22             WorldWind.logger().log(java.util.logging.Level.FINE, msg);
  23             throw new IllegalArgumentException(msg);
  24         }
  25
  26         javax.media.opengl.GL gl = dc.getGL();
  27
  28         gl.glPushAttrib(GL.GL_VIEWPORT_BIT | GL.GL_ENABLE_BIT | GL.GL_TRANSFORM_BIT);
  29
  30         gl.glMatrixMode(GL.GL_MODELVIEW);
  31         gl.glPushMatrix();
  32         gl.glLoadIdentity();
  33
  34         gl.glMatrixMode(GL.GL_PROJECTION);
  35         gl.glPushMatrix();
  36         gl.glLoadIdentity();
  37
  38         gl.glEnable(GL.GL_DEPTH_TEST);
  39     }
  40
  41     public void finalizeFrame(DrawContext dc)
  42     {
  43         if (null == dc)
  44         {
  45             String msg = WorldWind.retrieveErrMsg("nullValue.DrawContextIsNull");
  46             WorldWind.logger().log(java.util.logging.Level.FINE, msg);
  47             throw new IllegalArgumentException(msg);
  48         }
  49
  50         GL gl = dc.getGL();
  51
  52         gl.glMatrixMode(GL.GL_MODELVIEW);
  53         gl.glPopMatrix();
  54
  55         gl.glMatrixMode(GL.GL_PROJECTION);
  56         gl.glPopMatrix();
  57
  58         gl.glPopAttrib();
  59
  60         gl.glFlush();
  61
  62 //        checkGLErrors(dc);
  63     }
  64
  65     /**
  66      * Called to check for openGL errors. This method includes a "round-trip" between the application and renderer,
  67      * which is slow. Therefore, this method is excluded from the "normal" render pass. It is here as a matter of
  68      * convenience to developers, and is not part of the API.
  69      *
  70      * @param dc the relevant <code>DrawContext</code>
  71      */
  72     @SuppressWarnings({"UNUSED_SYMBOL", "UnusedDeclaration"})
  73     private void checkGLErrors(DrawContext dc)
  74     {
  75         GL gl = dc.getGL();
  76         int err = gl.glGetError();
  77         if (err != GL.GL_NO_ERROR)
  78         {
  79             String msg = dc.getGLU().gluErrorString(err);
  80             msg += err;
  81             WorldWind.logger().log(java.util.logging.Level.FINE, msg);
  82         }
  83     }
  84
  85     public void clearFrame(DrawContext dc)
  86     {
  87         java.awt.Color cc = dc.getClearColor();
  88         dc.getGL().glClearColor(cc.getRed(), cc.getGreen(), cc.getBlue(), cc.getAlpha());
  89         dc.getGL().glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
  90     }
  91 }