native: switch to setWaitEvent()

src/Engine.zig

@@ -53,10 +53,28 @@ pub fn setOptions(engine: *Engine, options: structs.Options) !void {
     engine.options = options;
 }
 
+// Signals mach to stop the update loop.
 pub fn setShouldClose(engine: *Engine, value: bool) void {
     engine.internal.setShouldClose(value);
 }
 
+// Signals mach to wait for an event with timeout before calling update()
+// again.  Mach resets to null, so call during each update() if needed.
+//
+// timeout is in seconds (null disables waiting)
+// - pass std.math.floatMax(f64) to wait with no timeout
+//
+// update() can be called earlier than timeout if an event happens (key press,
+// mouse motion, etc.)
+//
+// update() can be called a bit later than timeout due to timer precision and
+// process scheduling.
+//
+// Calling this multiple times means the last call's value is used.
+pub fn setWaitEvent(engine: *Engine, timeout: ?f64) void {
+    engine.internal.setWaitEvent(timeout);
+}
+
 // Returns the framebuffer size, in subpixel units.
 //
 // e.g. returns 1280x960 on macOS for a window that is 640x480
@@ -71,6 +89,10 @@ pub fn getWindowSize(engine: *Engine) structs.Size {
     return engine.internal.getWindowSize();
 }
 
+pub fn hasEvent(engine: *Engine) !bool {
+    return engine.internal.hasEvent();
+}
+
 pub fn pollEvent(engine: *Engine) ?structs.Event {
     return engine.internal.pollEvent();
 }