clear-fbo-tex: Add missing glFlush call on single buffered visual.

Otherwise the rendering doesn't happen.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/trivial/clear-fbo-tex.c b/src/trivial/clear-fbo-tex.c
index d91dd67d..de84f98f 100644
--- a/src/trivial/clear-fbo-tex.c
+++ b/src/trivial/clear-fbo-tex.c
@@ -163,6 +163,8 @@ static void Draw( void )
 
    if (doubleBuffer) {
       glutSwapBuffers();
+   } else {
+      glFlush();
    }
 
    CheckError();