From 71b6fb0590af9acd4bd5710f03fec09f48d98923 Mon Sep 17 00:00:00 2001
From: Eduardo Bart <edub4rt@gmail.com>
Date: Sun, 20 Mar 2011 19:30:15 -0300
Subject: [PATCH] render when visible only

---
 src/framework/engine.cpp | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/src/framework/engine.cpp b/src/framework/engine.cpp
index f068e98b..2981c62c 100644
--- a/src/framework/engine.cpp
+++ b/src/framework/engine.cpp
@@ -75,11 +75,13 @@ void Engine::run()
         update(ticks - lastFrameTicks);
         lastFrameTicks = ticks;
 
-        // render
-        render();
+        // render only when visible
+        if(Platform::isWindowVisible()) {
+            render();
 
-        // swap buffers
-        Platform::swapBuffers();
+            // swap buffers
+            Platform::swapBuffers();
+        }
     }
 
     lastFrameTicks = 0;