1 files changed, 73 insertions, 0 deletions
diff --git a/demos/MiscDemos/SharedGLTest.java b/demos/MiscDemos/SharedGLTest.java
new file mode 100644
index 0000000..1377b20
--- /dev/null
+++ b/demos/MiscDemos/SharedGLTest.java
@@ -0,0 +1,73 @@
+import java.awt.*;
+import gl4java.*;
+import gl4java.awt.*;
+
+public class SharedGLTest extends Frame {
+  public static void main(String[] args) {
+    SharedGLTest t1 = new SharedGLTest();
+    t1.setVisible(true);
+
+    do { // Wait until t1 is fully created and displayed.
+      if(t1.getGLContext() != null) break;
+    }
+    while(true);
+
+    SharedGLTest t2 = new SharedGLTest(t1.getGLContext());
+    t2.setVisible(true);
+  }
+
+  public SharedGLTest() { this(null); }
+  public SharedGLTest(GLContext shareWith) {
+    super();
+    setBounds(50, 0, 200, 200);
+    c = new MyCanvas(100, 100, shareWith);
+    add(c);
+  }
+
+  private MyCanvas c;
+  public GLContext getGLContext() { return c.getGLContext(); }
+
+  private class MyCanvas extends GLCanvas {
+
+    public MyCanvas(int w, int h) {
+      super(w, h);
+    }
+
+    public MyCanvas(int w, int h, GLContext shareWith) {
+      super(w, h);
+      sharedGLContext = shareWith;
+    }
+
+    public void display() {
+  	  if( glj.gljMakeCurrent() == false ) {
+    		System.out.println("problem in use() method");
+		    return;
+  	  }
+
+  	  GLFunc gl = glj.getGLFunc();
+      buildCallList(gl); // Really build something only once.
+      gl.glCallList(callList);
+
+
+	    glj.gljSwap();
+	    glj.gljCheckGL();
+  	  glj.gljFree();
+    }
+  }
+  private static int callList;
+  private static boolean alreadyDone;
+  private static void buildCallList(GLFunc gl) { // Build only one call list for both GLCanvas.
+    if(alreadyDone) return;
+    alreadyDone = true;
+
+    callList = gl.glGenLists(1);
+
+    gl.glNewList(callList, gl.GL_COMPILE);
+  	gl.glClearColor(1f, 0f, 0f, 1f);
+  	gl.glClear(gl.GL_COLOR_BUFFER_BIT); // Clear the GLCanvas with red.
+  	gl.glEndList();
+  }
+}
+
+
+