From ac2fa73962d4c25ca805a03ba77f5556732b05cd Mon Sep 17 00:00:00 2001
From: Ulrich Hecht <ulrich.hecht@gmail.com>
Date: Sun, 20 Jun 2010 13:01:50 +0200
Subject: [PATCH] don't waste CPU redrawing the screen when there's no input

Signed-off-by: Ulrich Hecht <ulrich.hecht@gmail.com>
---
 src/gmenu2x.cpp      | 5 ++---
 src/inputmanager.cpp | 5 ++++-
 src/inputmanager.h   | 2 +-
 3 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/src/gmenu2x.cpp b/src/gmenu2x.cpp
index 230e235..3cbc640 100644
--- a/src/gmenu2x.cpp
+++ b/src/gmenu2x.cpp
@@ -940,7 +940,8 @@ void GMenu2X::main() {
 		}
 
 //#ifdef TARGET_GP2X
-		input.update();
+		while (!input.update())
+			usleep(LOOP_DELAY);
 		if ( input[ACTION_B] && menu->selLink()!=NULL ) menu->selLink()->run();
 		else if ( input[ACTION_START]  ) options();
 		else if ( input[ACTION_SELECT] ) contextMenu();
@@ -993,8 +994,6 @@ void GMenu2X::main() {
 				offset = menu->sectionLinks()->size()>linksPerPage ? 2 : 6;
 			}
 		}
-
-		usleep(LOOP_DELAY);
 	}
 }
 
diff --git a/src/inputmanager.cpp b/src/inputmanager.cpp
index 3803682..58014f7 100644
--- a/src/inputmanager.cpp
+++ b/src/inputmanager.cpp
@@ -128,7 +128,8 @@ void InputManager::setActionsCount(int count) {
 	}
 }
 
-void InputManager::update() {
+bool InputManager::update() {
+	bool anyactions = false;
 	SDL_JoystickUpdate();
 
 	events.clear();
@@ -145,11 +146,13 @@ void InputManager::update() {
 			if (tick-actionTick[x]>interval[x]) {
 				actions[x] = true;
 				actionTick[x] = tick;
+				anyactions = true;
 			}
 		} else {
 			actionTick[x] = 0;
 		}
 	}
+	return anyactions;
 }
 
 int InputManager::count() {
diff --git a/src/inputmanager.h b/src/inputmanager.h
index 9e65614..11a08b2 100644
--- a/src/inputmanager.h
+++ b/src/inputmanager.h
@@ -78,7 +78,7 @@ public:
 	vector<bool> actions;
 	vector<MappingList> mappings;
 
-	void update();
+	bool update();
 	int count();
 	void setActionsCount(int count);
 	void setInterval(int ms, int action = -1);