EGL: eglSwapBuffers() show failure in DEBUG mode

1 files changed, 6 insertions, 1 deletions

diff --git a/src/jogl/classes/jogamp/opengl/egl/EGLOnscreenDrawable.java b/src/jogl/classes/jogamp/opengl/egl/EGLOnscreenDrawable.java
index 4359f2ac3..7d5e0448d 100644
--- a/src/jogl/classes/jogamp/opengl/egl/EGLOnscreenDrawable.java
+++ b/src/jogl/classes/jogamp/opengl/egl/EGLOnscreenDrawable.java
@@ -57,7 +57,12 @@ public class EGLOnscreenDrawable extends EGLDrawable {
     }
 
     protected void swapBuffersImpl() {
-        EGL.eglSwapBuffers(eglDisplay, eglSurface);
+        if(!EGL.eglSwapBuffers(eglDisplay, eglSurface)) {
+            if(DEBUG) {
+                System.err.println("eglSwapBuffers failed:");
+                Thread.dumpStack();
+            }
+        }
     }
 
 }