1 files changed, 10 insertions, 1 deletions
diff --git a/src/jogl/classes/jogamp/opengl/GLDrawableImpl.java b/src/jogl/classes/jogamp/opengl/GLDrawableImpl.java
index df7f742aa..ccf0a8f0d 100644
--- a/src/jogl/classes/jogamp/opengl/GLDrawableImpl.java
+++ b/src/jogl/classes/jogamp/opengl/GLDrawableImpl.java
@@ -244,7 +244,16 @@ public abstract class GLDrawableImpl implements GLDrawable {
   /** Callback for special implementations, allowing GLContext to fetch a custom default render framebuffer. Defaults to zero.*/
   protected int getDefaultDrawFramebuffer() { return 0; }
   /** Callback for special implementations, allowing GLContext to fetch a custom default read framebuffer. Defaults to zero. */
-  protected int getDefaultReadFramebuffer() { return 0; }
+  protected int getDefaultReadFramebuffer() { return 0; }  
+  /** Callback for special implementations, allowing GLContext to fetch a custom default read buffer of current framebuffer. */
+  protected int getDefaultReadBuffer(GL gl) {
+      if(gl.isGLES() || getChosenGLCapabilities().getDoubleBuffered()) {
+          // Note-1: Neither ES1 nor ES2 supports selecting the read buffer via glReadBuffer
+          // Note-2: ES3 only supports GL_BACK, GL_NONE or GL_COLOR_ATTACHMENT0+i
+          return GL.GL_BACK;
+      }
+      return GL.GL_FRONT ; 
+  }
   
   @Override
   public final synchronized boolean isRealized() {