1 files changed, 20 insertions, 0 deletions
diff --git a/lib/engine.cc b/lib/engine.cc
index ed52d8c..2d53beb 100644
--- a/lib/engine.cc
+++ b/lib/engine.cc
@@ -5,6 +5,11 @@
 bool mogltk::engine::inited = false, mogltk::engine::postsetuped = false;
 bool mogltk::engine::appactive = false, mogltk::engine::cursorvisible = false, mogltk::engine::quitrequest = false;
 int mogltk::engine::mx, mogltk::engine::my, mogltk::engine::mbuttons;
+int mogltk::engine::frames;
+double mogltk::engine::curfps = -1;
+Uint32 mogltk::engine::curticks;
+
+#define UPDATERATE 1000
 
 int mogltk::engine::setup() throw(GeneralException) {
     if (inited) {
@@ -28,6 +33,7 @@ int mogltk::engine::postsetup() throw(GeneralException) {
     }
     
     SDL_EnableUNICODE(1);
+    curticks = SDL_GetTicks();
     
     postsetuped = true;
 
@@ -110,6 +116,16 @@ void mogltk::engine::pollevents() {
     if (!postsetuped)
 	postsetup();
     
+    if (appactive) {
+	Uint32 ticks = SDL_GetTicks();
+	frames++;
+	if (ticks - curticks > UPDATERATE) {
+	    curfps = (double) frames * 1000 / (ticks - curticks);
+	    frames = 0;
+	    curticks = ticks;
+	}
+    }
+    
     while(true) {
 	if (hastoreturn)
 	    if (!SDL_PollEvent(NULL)) {
@@ -197,3 +213,7 @@ int mogltk::engine::mouseY() {
 int mogltk::engine::mousebuttons() {
     return mbuttons;
 }
+
+double mogltk::engine::FPS() {
+    return curfps;
+}