From 818d795b09637d16e00a18d729a5eaa14c19d423 Mon Sep 17 00:00:00 2001
From: Pascal Massimino <pascal.massimino@gmail.com>
Date: Tue, 9 May 2017 18:02:25 +0200
Subject: [PATCH] vwebp: activate GLUT double-buffering

This prevents the flickering of animated webp + alpha.

Change-Id: I335a434ccc6c90e32528c9832555a38cc0f71cc4
---
 examples/vwebp.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/examples/vwebp.c b/examples/vwebp.c
index 485d629b..8feeccea 100644
--- a/examples/vwebp.c
+++ b/examples/vwebp.c
@@ -378,13 +378,13 @@ static void HandleDisplay(void) {
     }
   }
   glPopMatrix();
-  glFlush();
+  glutSwapBuffers();
 }
 
 static void StartDisplay(void) {
   const int width = kParams.canvas_width;
   const int height = kParams.canvas_height;
-  glutInitDisplayMode(GLUT_RGBA);
+  glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA);
   glutInitWindowSize(width, height);
   glutCreateWindow("WebP viewer");
   glutDisplayFunc(HandleDisplay);