Attachment 118 Details for Bug 347 – Java source code demostrating the bug.

Java source code demostrating the bug.

LineAlignmentBug.java (text/plain), 3.69 KB, created by Sven Gothel on 2008-03-10 07:18:00 CET

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Creator: Sven Gothel

Created: 2008-03-10 07:18:00 CET

Size: 3.69 KB

patch

obsolete

>
>import java.awt.*;
>import java.awt.event.*;
>
>import javax.media.opengl.*;
>import javax.swing.*;
>
>/**
> * Example JOGL application showing bug when drawing a line strip with flat shading
> * turned on. The bug occurs when using GLJPanel under the Windows Vista operating system.
> * The bug does not occur under Windows XP.
> *
> * Run environment: 
> * Machine  : n/a
> * OS       : Windows Vista Business (no service pack)
> * Graphics : NVIDIA Geforce3
> * Drivers  : Microsoft Driver 6.0.6000.16386
> * JVM      : java 1.4.2_16 and 1.6.0_04
> * JOGL     : 1.1.1-rc4 and 1.1.1-rc7
> * @author Alan Michael Gay, AVS Inc.
> */
>public class LineAlignmentBug extends JFrame implements GLEventListener 
>{        
>    public LineAlignmentBug()
>    {        
>        // Specify the Frame window title and initial size.
>        setTitle("Line Alignment bug");
>
>        // Create a listener object that will cause the application
>        // to exit when the user dismisses the Frame window.
>        this.addWindowListener(new WindowAdapter()
>        {
>            public void windowClosing(WindowEvent e)
>            {
>                System.exit(0);
>            }
>        });   
>
>        // Use the default capabilities.
>        GLCapabilities capabilities = new GLCapabilities();
>
>        GLJPanel canvas = new GLJPanel(capabilities);
>        canvas.addGLEventListener(this);
>            
>        this.getContentPane().add(canvas);
>    }
>        
>    /**
>     * Sets the OpenGL color using the specified java.awt.Color.
>     * @param gl The OpenGL context whose color is to be set.
>     * @param color The color to set.
>     */
>    private void setColor(GL gl, Color color)
>    {        
>        float red   = color.getRed()/255.0f;
>        float green = color.getGreen()/255.0f;
>        float blue  = color.getBlue()/255.0f;        
>        gl.glColor3f(red, green, blue);              
>    }
>    
>    
>    /**
>     * Implementation of GLEventListener.display
>     * Draws a triangle with a border using a line strip.
>     */
>    public void display(GLAutoDrawable arg0)
>    {
>        GL gl = arg0.getGL();
>        
>        gl.glClear(GL.GL_COLOR_BUFFER_BIT);
>        gl.glMatrixMode(GL.GL_MODELVIEW);
>                
>        // BUG
>        // Line is drawn in the incorrect position when turning flat shading on.
>        gl.glShadeModel(GL.GL_FLAT);
>        
>        //
>        // Triangles
>        //        
>        setColor(gl, Color.GREEN);
>               
>        gl.glBegin(GL.GL_TRIANGLES);
>        
>        gl.glVertex3f(-0.5f, 0.5f, 0.0f);
>        gl.glVertex3f(0.5f, 0.5f, 0.0f);
>        gl.glVertex3f(0.5f, -0.5f, 0.0f);
>      
>        gl.glEnd();    
>                
>        ///
>        // Line strip
>        //        
>        setColor(gl, Color.RED);
>          
>        gl.glBegin(GL.GL_LINE_STRIP);        
>        gl.glVertex3f(-0.5f, 0.5f, 0.0f);
>        gl.glVertex3f(0.5f, 0.5f, 0.0f);                                     
>        gl.glVertex3f(0.5f, -0.5f, 0.0f);
>        gl.glVertex3f(-0.5f, 0.5f, 0.0f);
>        gl.glEnd();    
>    }
>    
>
>    public void init(GLAutoDrawable arg0)
>    {
>    }
>
>    public void reshape(GLAutoDrawable arg0, int arg1, int arg2, int arg3, int arg4)
>    {    
>    }
>
>    public void displayChanged(GLAutoDrawable arg0, boolean arg1, boolean arg2)
>    {  
>    }
>
>    /**
>     * The main() method is called when the Java Virtual Machine starts up. It
>     * just creates and displays an instance of the application.
>     */
>    public static void main(String args[])
>    {
>        LineAlignmentBug app = new LineAlignmentBug();
>        app.pack();
>        app.setSize(300, 300);
>        app.setVisible(true);
>    }
>}
>

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