Workaround for slow HW rendering

GLJPanel thinks it is a great idea to use glReadPixels. The Intel
i965 DRI driver thinks otherwise and does no get more than 2 FPS on
a i5-460M CPU (HD Graphics).

With Mesa software rendering (LIBGL_ALWAYS_SOFTWARE=1), the performance
gets stuck on 20 FPS or something. Unfortunately, the software renderer
crashes since Mesa 10[1].

This workaround improves performance by replacing GLJPanel by GLCanvas
as mentioned in the Jogamp wiki[2]. FPS now caps on 30 (but this
can be bumped to 42 by changing Base.FPS to 60).

 [1]: https://bugs.freedesktop.org/show_bug.cgi?id=72926
 [2]: http://jogamp.org/wiki/index.php/Using_JOGL_in_AWT_SWT_and_Swing

1 files changed, 16 insertions, 9 deletions

diff --git a/src/robotrace/Base.java b/src/robotrace/Base.java
index 0f67ce6..e083afd 100644
--- a/src/robotrace/Base.java
+++ b/src/robotrace/Base.java
@@ -4,6 +4,7 @@ import com.jogamp.opengl.util.FPSAnimator;
 import com.jogamp.opengl.util.gl2.GLUT;
 import com.jogamp.opengl.util.texture.Texture;
 import com.jogamp.opengl.util.texture.TextureIO;
+import java.awt.BorderLayout;
 import java.awt.event.KeyEvent;
 import java.awt.event.KeyListener;
 import java.awt.event.MouseEvent;
@@ -20,6 +21,7 @@ import javax.media.opengl.GL;
 import javax.media.opengl.GL2;
 import javax.media.opengl.GLAutoDrawable;
 import javax.media.opengl.GLEventListener;
+import javax.media.opengl.awt.GLCanvas;
 import javax.media.opengl.awt.GLJPanel;
 import javax.media.opengl.glu.GLU;
 import javax.swing.UIManager;
@@ -107,21 +109,26 @@ abstract public class Base {
         
         // Redirect OpenGL listener to the abstract render functions.
         GLJPanel glPanel = (GLJPanel) frame.glPanel;
-        glPanel.addGLEventListener(new GLEventDelegate());
+
+        // HACK: get better performance
+        GLCanvas glCanvas = new GLCanvas();
+        frame.remove(glPanel);
+        frame.getContentPane().add(glCanvas, BorderLayout.CENTER);
+        glCanvas.addGLEventListener(new GLEventDelegate());
         
         // Attach mouse and keyboard listeners.
         GLListener listener = new GLListener();
-        glPanel.addMouseListener(listener);
-        glPanel.addMouseMotionListener(listener);
-        glPanel.addMouseWheelListener(listener);
-        glPanel.addKeyListener(listener);
-        glPanel.setFocusable(true);
-        glPanel.requestFocusInWindow();
-        
+        glCanvas.addMouseListener(listener);
+        glCanvas.addMouseMotionListener(listener);
+        glCanvas.addMouseWheelListener(listener);
+        glCanvas.addKeyListener(listener);
+        glCanvas.setFocusable(true);
+        glCanvas.requestFocusInWindow();
+
         // Attach animator to OpenGL panel and begin refresh
         // at the specified number of frames per second.
         final FPSAnimator animator =
-                new FPSAnimator((GLJPanel) frame.glPanel, FPS, true);
+                new FPSAnimator(glCanvas, FPS, true);
         animator.setIgnoreExceptions(false);
         animator.setPrintExceptions(true);