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-rw-r--r--examples/vsync.rs46
1 files changed, 46 insertions, 0 deletions
diff --git a/examples/vsync.rs b/examples/vsync.rs
new file mode 100644
index 0000000..ec9ea79
--- /dev/null
+++ b/examples/vsync.rs
@@ -0,0 +1,46 @@
+#[cfg(target_os = "android")]
+#[macro_use]
+extern crate android_glue;
+
+extern crate clock_ticks;
+extern crate glutin;
+
+mod support;
+
+#[cfg(target_os = "android")]
+android_start!(main);
+
+#[cfg(not(feature = "window"))]
+fn main() { println!("This example requires glutin to be compiled with the `window` feature"); }
+
+#[cfg(feature = "window")]
+fn resize_callback(width: u32, height: u32) {
+ println!("Window resized to {}x{}", width, height);
+}
+
+#[cfg(feature = "window")]
+fn main() {
+ println!("Vsync example. This example may panic if your driver or your system forces \
+ you out of vsync. This is intended when `build_strict` is used.");
+
+ let mut window = glutin::WindowBuilder::new().with_vsync().build_strict().unwrap();
+ window.set_window_resize_callback(Some(resize_callback as fn(u32, u32)));
+ unsafe { window.make_current() };
+
+ let context = support::load(&window);
+
+ while !window.is_closed() {
+ let before = clock_ticks::precise_time_ns();
+
+ context.draw_frame((0.0, 1.0, 0.0, 1.0));
+ window.swap_buffers();
+
+ for ev in window.poll_events() {
+ println!("{:?}", ev);
+ }
+
+ let after = clock_ticks::precise_time_ns();
+ println!("Vsync example - Time of previous frame: {}ms",
+ (after - before) as f32 / 1000000.0);
+ }
+}