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Diffstat (limited to 'samples/OpenGL/x11argb_opengl/x11argb_opengl.c')
-rw-r--r--samples/OpenGL/x11argb_opengl/x11argb_opengl.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/samples/OpenGL/x11argb_opengl/x11argb_opengl.c b/samples/OpenGL/x11argb_opengl/x11argb_opengl.c
index 1c1e2e0..723c6ae 100644
--- a/samples/OpenGL/x11argb_opengl/x11argb_opengl.c
+++ b/samples/OpenGL/x11argb_opengl/x11argb_opengl.c
@@ -23,12 +23,16 @@
\_____/ FTB.
------------------------------------------------------------------------*/
+#define _GNU_SOURCE
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
+#include <sys/types.h>
+#include <time.h>
+
#include <GL/gl.h>
#include <GL/glx.h>
#include <GL/glxext.h>
@@ -461,7 +465,13 @@ static void redrawTheWindow()
b = fmod(b+0.5, 360.);
c = fmod(c+0.25, 360.);
+ struct timespec Ta, Tb;
+
+ clock_gettime(CLOCK_MONOTONIC_RAW, &Ta);
glXSwapBuffers(Xdisplay, glX_window_handle);
+ clock_gettime(CLOCK_MONOTONIC_RAW, &Tb);
+
+ fprintf(stderr, "glXSwapBuffers returned after %f ms\n", 1e3*((double)Tb.tv_sec + 1e-6*(double)Tb.tv_nsec) - 1e3*((double)Ta.tv_sec + 1e-6*(double)Ta.tv_nsec));
}
int main(int argc, char *argv[])