Fixed Issue 92: Platform Independent VSync functionality

Added GL.setSwapInterval() which delegates to appropriate
platform-dependent routines. Must be called only from within
GLEventListener callbacks.


git-svn-id: file:///usr/local/projects/SUN/JOGL/git-svn/svn-server-sync/jogl/trunk@260 232f8b59-042b-4e1e-8c03-345bb8c30851

3 files changed, 21 insertions, 0 deletions

diff --git a/src/net/java/games/jogl/impl/GLContext.java b/src/net/java/games/jogl/impl/GLContext.java
index 17667fbce..318ff24a2 100644
--- a/src/net/java/games/jogl/impl/GLContext.java
+++ b/src/net/java/games/jogl/impl/GLContext.java
@@ -552,6 +552,13 @@ public abstract class GLContext {
    */
   public abstract void releasePbufferFromTexture();
 
+  /*
+   * Sets the swap interval for onscreen OpenGL contexts. Has no
+   * effect for offscreen contexts.
+   */
+  public void setSwapInterval(final int interval) {
+  }
+
   /** Maps the given "platform-independent" function name to a real function
       name. Currently this is only used to map "glAllocateMemoryNV" and
       associated routines to wglAllocateMemoryNV / glXAllocateMemoryNV. */
diff --git a/src/net/java/games/jogl/impl/macosx/MacOSXGLContext.java b/src/net/java/games/jogl/impl/macosx/MacOSXGLContext.java
index 3c8027e7c..cfa5c3d99 100644
--- a/src/net/java/games/jogl/impl/macosx/MacOSXGLContext.java
+++ b/src/net/java/games/jogl/impl/macosx/MacOSXGLContext.java
@@ -227,6 +227,13 @@ public abstract class MacOSXGLContext extends GLContext
     return "";
   }
 	
+  public void setSwapInterval(int interval) {
+    if (nsContext == 0) {
+      throw new GLException("OpenGL context not current");
+    }
+    CGL.setSwapInterval(nsContext, interval);
+  }
+
   //----------------------------------------------------------------------
   // Internals only below this point
   //
diff --git a/src/net/java/games/jogl/impl/x11/X11OnscreenGLContext.java b/src/net/java/games/jogl/impl/x11/X11OnscreenGLContext.java
index 1b5f54979..241a45dc9 100644
--- a/src/net/java/games/jogl/impl/x11/X11OnscreenGLContext.java
+++ b/src/net/java/games/jogl/impl/x11/X11OnscreenGLContext.java
@@ -103,6 +103,13 @@ public class X11OnscreenGLContext extends X11GLContext {
     throw new GLException("Should not call this");
   }
 
+  public void setSwapInterval(int interval) {
+    GL gl = getGL();
+    if (gl.isExtensionAvailable("GLX_SGI_swap_control")) {
+      gl.glXSwapIntervalSGI(interval);
+    }
+  }
+
   protected synchronized boolean makeCurrent(Runnable initAction) throws GLException {
     try {
       if (!lockSurface()) {