From 987f70c8e9b1bab87647d4ed20df79900d6c0c9e Mon Sep 17 00:00:00 2001
From: Wolfgang Draxinger <Wolfgang.Draxinger@draxit.de>
Date: Sat, 14 Sep 2013 15:59:51 +0200
Subject: X11 clobberable window added

---
 samples/OpenGL/x11argb_opengl_glsl/x11argb_opengl_glsl.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'samples/OpenGL/x11argb_opengl_glsl')

diff --git a/samples/OpenGL/x11argb_opengl_glsl/x11argb_opengl_glsl.c b/samples/OpenGL/x11argb_opengl_glsl/x11argb_opengl_glsl.c
index b658f5c..0852cbc 100644
--- a/samples/OpenGL/x11argb_opengl_glsl/x11argb_opengl_glsl.c
+++ b/samples/OpenGL/x11argb_opengl_glsl/x11argb_opengl_glsl.c
@@ -24,12 +24,17 @@
 
 ------------------------------------------------------------------------*/
 
+#define _GNU_SOURCE
+
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
 #include <math.h>
 #include <sys/time.h>
 
+#include <sys/types.h>
+#include <time.h>
+
 #include <GL/glew.h>
 #include <GL/glx.h>
 #include <X11/Xatom.h>
@@ -571,7 +576,16 @@ static void redrawTheWindow(double T)
     draw_cube();
     popModelview();
 
+	struct timespec Ta, Tb;
+
+	clock_gettime(CLOCK_MONOTONIC_RAW, &Ta);
  	glXSwapBuffers(Xdisplay, glX_window_handle);
+	glXWaitGL();
+	clock_gettime(CLOCK_MONOTONIC_RAW, &Tb);
+	
+	fprintf(stderr, "glXSwapBuffers + glXWaitGL returned after %f ms\n",
+	1e3*( (double)Tb.tv_sec + 1e-9*(double)Tb.tv_nsec ) -
+	1e3*( (double)Ta.tv_sec + 1e-9*(double)Ta.tv_nsec ) );	
 }
 
 static double getftime(void) {
-- 
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