Implements cmd_shakeScreen.

svn-id: r21394

3 files changed, 25 insertions, 2 deletions

diff --git a/engines/kyra/screen.cpp b/engines/kyra/screen.cpp
index af55d6f300..5b34dbaea8 100644
--- a/engines/kyra/screen.cpp
+++ b/engines/kyra/screen.cpp
@@ -2094,4 +2094,17 @@ void Screen::copyBackgroundBlock2(int x) {
 	copyBackgroundBlock(x, 4, 1);
 }
 
+void Screen::shakeScreen(int times) {
+	debugC(9, kDebugLevelScreen, "Screen::shakeScreen(%d)", times);
+	
+	while (times--) {
+		// seems to be 1 line (320 pixels) offset in the original
+		// 4 looks more like dosbox though, maybe check this again
+		_system->setShakePos(4);
+		_system->updateScreen();
+		_system->setShakePos(0);
+		_system->updateScreen();
+	}
+}
+
 } // End of namespace Kyra
diff --git a/engines/kyra/screen.h b/engines/kyra/screen.h
index 5b50e2e5b1..22586e4c01 100644
--- a/engines/kyra/screen.h
+++ b/engines/kyra/screen.h
@@ -130,7 +130,9 @@ public:
 	static void decodeFrameDeltaPage(uint8 *dst, const uint8 *src, int pitch, int noXor);
 	uint8 *encodeShape(int x, int y, int w, int h, int flags);
 	void copyRegionToBuffer(int pageNum, int x, int y, int w, int h, uint8 *dest);
-		
+
+	void shakeScreen(int times);
+
 	int getRectSize(int x, int y);
 	void hideMouse();
 	void showMouse();
diff --git a/engines/kyra/script_v1.cpp b/engines/kyra/script_v1.cpp
index 920d730858..bc09ba707a 100644
--- a/engines/kyra/script_v1.cpp
+++ b/engines/kyra/script_v1.cpp
@@ -1371,7 +1371,15 @@ int KyraEngine::cmd_intPrint(ScriptState *script) {
 }
 
 int KyraEngine::cmd_shakeScreen(ScriptState *script) {
-	warning("STUB: cmd_shakeScreen");
+	debugC(3, kDebugLevelScriptFuncs, "cmd_shakeScreen(%p) (%d, %d)", (const void *)script, stackPos(0), stackPos(1));
+	int waitTicks = stackPos(1);
+	int times = stackPos(0);
+
+	for (int i = 0; i < times; ++i) {
+		_screen->shakeScreen(1);
+		delay(waitTicks * _tickLength);
+	}
+
 	return 0;
 }