GRAPHICS: Add interface for horizontal shake

31 files changed, 107 insertions, 83 deletions

diff --git a/backends/platform/3ds/osystem-graphics.cpp b/backends/platform/3ds/osystem-graphics.cpp
index c3864c143f..1ea70053fb 100644
--- a/backends/platform/3ds/osystem-graphics.cpp
+++ b/backends/platform/3ds/osystem-graphics.cpp
@@ -366,11 +366,12 @@ void OSystem_3DS::updateScreen() {
 	C3D_FrameEnd(0);
 }
 
-void OSystem_3DS::setShakePos(int shakeOffset) {
+void OSystem_3DS::setShakePos(int shakeXOffset, int shakeYOffset) {
 	// TODO: implement this in overlay, top screen, and mouse too
-	_screenShakeOffset = shakeOffset;
-	_gameTopTexture.setPosition(_gameTopX, _gameTopY + _gameTopTexture.getScaleY() * shakeOffset);
-	_gameBottomTexture.setPosition(_gameBottomX, _gameBottomY + _gameBottomTexture.getScaleY() * shakeOffset);
+	_screenShakeXOffset = shakeXOffset;
+	_screenShakeYOffset = shakeYOffset;
+	_gameTopTexture.setPosition(_gameTopX, _gameTopY + _gameTopTexture.getScaleY() * shakeYOffset);
+	_gameBottomTexture.setPosition(_gameBottomX, _gameBottomY + _gameBottomTexture.getScaleY() * shakeYOffset);
 }
 
 void OSystem_3DS::setFocusRectangle(const Common::Rect &rect) {
diff --git a/backends/platform/3ds/osystem.h b/backends/platform/3ds/osystem.h
index c15c353c24..a0f78fdce2 100644
--- a/backends/platform/3ds/osystem.h
+++ b/backends/platform/3ds/osystem.h
@@ -119,7 +119,7 @@ public:
 	Graphics::Surface *lockScreen();
 	void unlockScreen();
 	void updateScreen();
-	void setShakePos(int shakeOffset);
+	void setShakePos(int shakeXOffset, int shakeYOffset);
 	void setFocusRectangle(const Common::Rect &rect);
 	void clearFocusRectangle();
 	void showOverlay();
@@ -200,7 +200,8 @@ private:
 	};
 	uint32 _osdMessageEndTime;
 
-	int _screenShakeOffset;
+	int _screenShakeXOffset;
+	int _screenShakeYOffset;
 	bool _overlayVisible;
 	int _screenChangeId;
 
diff --git a/backends/platform/dc/dc.h b/backends/platform/dc/dc.h
index cdea88e6b3..20098a5e2e 100644
--- a/backends/platform/dc/dc.h
+++ b/backends/platform/dc/dc.h
@@ -145,7 +145,7 @@ public:
   void setCursorPalette(const byte *colors, uint start, uint num);
 
   // Shaking is used in SCUMM. Set current shake position.
-  void setShakePos(int shake_pos);
+  void setShakePos(int shake_x_pos, int shake_y_pos);
 
   // Get the number of milliseconds since the program was started.
   uint32 getMillis(bool skipRecord = false);
@@ -201,7 +201,7 @@ public:
 
   int _ms_cur_x, _ms_cur_y, _ms_cur_w, _ms_cur_h, _ms_old_x, _ms_old_y;
   int _ms_hotspot_x, _ms_hotspot_y, _ms_visible, _devpoll, _last_screen_refresh;
-  int _current_shake_pos, _screen_w, _screen_h;
+  int _current_shake_x_pos, _current_shake_y_pos, _screen_w, _screen_h;
   int _overlay_x, _overlay_y;
   unsigned char *_ms_buf;
   uint32 _ms_keycolor;
diff --git a/backends/platform/dc/dcmain.cpp b/backends/platform/dc/dcmain.cpp
index 26cf9de5b4..31fd883cd6 100644
--- a/backends/platform/dc/dcmain.cpp
+++ b/backends/platform/dc/dcmain.cpp
@@ -42,7 +42,7 @@ const char *gGameName;
 OSystem_Dreamcast::OSystem_Dreamcast()
   : _devpoll(0), screen(NULL), mouse(NULL), overlay(NULL), _softkbd(this),
     _ms_buf(NULL), _mixer(NULL),
-    _current_shake_pos(0), _aspect_stretch(false), _softkbd_on(false),
+    _current_shake_x_pos(0), _current_shake_y_pos(0), _aspect_stretch(false), _softkbd_on(false),
     _softkbd_motion(0), _enable_cursor_palette(false), _screenFormat(0)
 {
   memset(screen_tx, 0, sizeof(screen_tx));
diff --git a/backends/platform/dc/display.cpp b/backends/platform/dc/display.cpp
index 2547605398..447f671059 100644
--- a/backends/platform/dc/display.cpp
+++ b/backends/platform/dc/display.cpp
@@ -35,7 +35,7 @@
 #define OVL_H 200
 #define OVL_TXSTRIDE 512
 
-#define TOP_OFFSET (_top_offset+_yscale*_current_shake_pos)
+#define TOP_OFFSET (_top_offset+_yscale*_current_shake_y_pos)
 
 static const struct {
   Graphics::PixelFormat pixelFormat;
@@ -320,9 +320,10 @@ void OSystem_Dreamcast::setMouseCursor(const void *buf, uint w, uint h,
   memcpy(_ms_buf, buf, w * h);
 }
 
-void OSystem_Dreamcast::setShakePos(int shake_pos)
+void OSystem_Dreamcast::setShakePos(int shake_x_pos, int shake_y_pos)
 {
-  _current_shake_pos = shake_pos;
+  _current_shake_x_pos = shake_x_pos;
+  _current_shake_y_pos = shake_y_pos;
 }
 
 void OSystem_Dreamcast::updateScreenTextures(void)
diff --git a/backends/platform/ds/arm9/source/dsmain.cpp b/backends/platform/ds/arm9/source/dsmain.cpp
index 041892aed6..b0f61322d5 100644
--- a/backends/platform/ds/arm9/source/dsmain.cpp
+++ b/backends/platform/ds/arm9/source/dsmain.cpp
@@ -260,7 +260,8 @@ static SpriteEntry spritesMain[128];
 static int tweak;
 
 // Shake
-static int s_shakePos = 0;
+static int s_shakeXOffset = 0;
+static int s_shakeYOffset = 0;
 
 // Keyboard
 static bool keyboardEnable = false;
@@ -1016,8 +1017,9 @@ void displayMode16BitFlipBuffer() {
 	#endif
 }
 
-void setShakePos(int shakePos) {
-	s_shakePos = shakePos;
+void setShakePos(int shakeXOffset, int shakeYOffset) {
+	s_shakeXOffset = shakeXOffset;
+	s_shakeYOffset = shakeYOffset;
 }
 
 
@@ -2096,7 +2098,7 @@ void VBlankHandler(void) {
 		SUB_BG3_CX = subScX + 64;
 	}
 
-	SUB_BG3_CY = subScY + (s_shakePos << 8);*/
+	SUB_BG3_CY = subScY + (s_shakeYOffset << 8);*/
 
 	/*SUB_BG3_XDX = (int) (subScreenWidth / 256.0f * 256);
 	SUB_BG3_XDY = 0;
@@ -2228,7 +2230,7 @@ void VBlankHandler(void) {
 			setZoomedScreenScale(subScreenWidth, ((subScreenHeight * (256 << 8)) / 192) >> 8);
 
 
-			setMainScreenScroll(scX << 8, (scY << 8) + (s_shakePos << 8));
+			setMainScreenScroll(scX << 8, (scY << 8) + (s_shakeYOffset << 8));
 			setMainScreenScale(256, 256);		// 1:1 scale
 
 		} else {
@@ -2244,7 +2246,7 @@ void VBlankHandler(void) {
 			setZoomedScreenScroll(subScX, subScY, (subScreenWidth != 256) && (subScreenWidth != 128));
 			setZoomedScreenScale(subScreenWidth, ((subScreenHeight * (256 << 8)) / 192) >> 8);
 
-			setMainScreenScroll(64, (scY << 8) + (s_shakePos << 8));
+			setMainScreenScroll(64, (scY << 8) + (s_shakeYOffset << 8));
 			setMainScreenScale(320, 256);		// 1:1 scale
 
 		}
diff --git a/backends/platform/ds/arm9/source/dsmain.h b/backends/platform/ds/arm9/source/dsmain.h
index 7345fc2ceb..b413c70763 100644
--- a/backends/platform/ds/arm9/source/dsmain.h
+++ b/backends/platform/ds/arm9/source/dsmain.h
@@ -112,7 +112,7 @@ void	setShowCursor(bool enable);
 void	setMouseCursorVisible(bool visible);
 
 // Shake
-void 	setShakePos(int shakePos);
+void 	setShakePos(int shakeXOffset, int shakeYOffset);
 
 // Reports
 void 	memoryReport();
diff --git a/backends/platform/ds/arm9/source/osystem_ds.cpp b/backends/platform/ds/arm9/source/osystem_ds.cpp
index 9abeb59474..c9a1f08758 100644
--- a/backends/platform/ds/arm9/source/osystem_ds.cpp
+++ b/backends/platform/ds/arm9/source/osystem_ds.cpp
@@ -490,8 +490,8 @@ void OSystem_DS::updateScreen() {
 	}
 }
 
-void OSystem_DS::setShakePos(int shakeOffset) {
-	DS::setShakePos(shakeOffset);
+void OSystem_DS::setShakePos(int shakeXOffset, int shakeYOffset) {
+	DS::setShakePos(shakeXOffset, shakeYOffset);
 }
 
 void OSystem_DS::showOverlay() {
diff --git a/backends/platform/ds/arm9/source/osystem_ds.h b/backends/platform/ds/arm9/source/osystem_ds.h
index c2813d11e4..5db644bed5 100644
--- a/backends/platform/ds/arm9/source/osystem_ds.h
+++ b/backends/platform/ds/arm9/source/osystem_ds.h
@@ -103,7 +103,7 @@ public:
 
 	virtual void copyRectToScreen(const void *buf, int pitch, int x, int y, int w, int h);
 	virtual void updateScreen();
-	virtual void setShakePos(int shakeOffset);
+	virtual void setShakePos(int shakeXOffset, int shakeYOffset);
 
 	virtual void showOverlay();
 	virtual void hideOverlay();
diff --git a/backends/platform/ios7/ios7_common.h b/backends/platform/ios7/ios7_common.h
index aa5134335e..dd1e85a884 100644
--- a/backends/platform/ios7/ios7_common.h
+++ b/backends/platform/ios7/ios7_common.h
@@ -80,7 +80,8 @@ struct VideoContext {
 	VideoContext() : asprectRatioCorrection(), screenWidth(), screenHeight(), overlayVisible(false),
 	                 overlayWidth(), overlayHeight(), mouseX(), mouseY(),
 	                 mouseHotspotX(), mouseHotspotY(), mouseWidth(), mouseHeight(),
-	                 mouseIsVisible(), graphicsMode(kGraphicsModeNone), filtering(false), shakeOffsetY() {
+	                 mouseIsVisible(), graphicsMode(kGraphicsModeNone), filtering(false),
+	                 shakeXOffset(), shakeYOffset() {
 	}
 
 	// Game screen state
@@ -103,7 +104,8 @@ struct VideoContext {
 	// Misc state
 	GraphicsModes graphicsMode;
 	bool filtering;
-	int shakeOffsetY;
+	int shakeXOffset;
+	int shakeYOffset;
 };
 
 struct InternalEvent {
diff --git a/backends/platform/ios7/ios7_osys_main.h b/backends/platform/ios7/ios7_osys_main.h
index 994a67dddb..f70e48e7de 100644
--- a/backends/platform/ios7/ios7_osys_main.h
+++ b/backends/platform/ios7/ios7_osys_main.h
@@ -161,7 +161,7 @@ public:
 	virtual void updateScreen();
 	virtual Graphics::Surface *lockScreen();
 	virtual void unlockScreen();
-	virtual void setShakePos(int shakeOffset);
+	virtual void setShakePos(int shakeXOffset, int shakeYOffset);
 
 	virtual void showOverlay();
 	virtual void hideOverlay();
diff --git a/backends/platform/ios7/ios7_osys_video.mm b/backends/platform/ios7/ios7_osys_video.mm
index 20cf687709..d31ca10ea3 100644
--- a/backends/platform/ios7/ios7_osys_video.mm
+++ b/backends/platform/ios7/ios7_osys_video.mm
@@ -138,7 +138,8 @@ void OSystem_iOS7::initSize(uint width, uint height, const Graphics::PixelFormat
 
 	_videoContext->screenWidth = width;
 	_videoContext->screenHeight = height;
-	_videoContext->shakeOffsetY = 0;
+	_videoContext->shakeXOffset = 0;
+	_videoContext->shakeYOffset = 0;
 
 	// In case we use the screen texture as frame buffer we reset the pixels
 	// pointer here to avoid freeing the screen texture.
@@ -354,9 +355,10 @@ void OSystem_iOS7::unlockScreen() {
 	dirtyFullScreen();
 }
 
-void OSystem_iOS7::setShakePos(int shakeOffset) {
-	//printf("setShakePos(%i)\n", shakeOffset);
-	_videoContext->shakeOffsetY = shakeOffset;
+void OSystem_iOS7::setShakePos(int shakeXOffset, int shakeYOffset) {
+	//printf("setShakePos(%i, %i)\n", shakeXOffset, shakeYOffset);
+	_videoContext->shakeXOffset = shakeXOffset;
+	_videoContext->shakeYOffset = shakeYOffset;
 	execute_on_main_thread(^ {
 		[[iOS7AppDelegate iPhoneView] setViewTransformation];
 	});
diff --git a/backends/platform/ios7/ios7_video.h b/backends/platform/ios7/ios7_video.h
index a26213f28e..030d81cd9f 100644
--- a/backends/platform/ios7/ios7_video.h
+++ b/backends/platform/ios7/ios7_video.h
@@ -84,7 +84,8 @@ typedef struct {
 	GLint _mouseWidth, _mouseHeight;
 	GLfloat _mouseScaleX, _mouseScaleY;
 
-	int _scaledShakeOffsetY;
+	int _scaledShakeXOffset;
+	int _scaledShakeYOffset;
 
 	UITouch *_firstTouch;
 	UITouch *_secondTouch;
diff --git a/backends/platform/ios7/ios7_video.mm b/backends/platform/ios7/ios7_video.mm
index 321ccdb63d..914dc6ded1 100644
--- a/backends/platform/ios7/ios7_video.mm
+++ b/backends/platform/ios7/ios7_video.mm
@@ -454,7 +454,8 @@ uint getSizeNextPOT(uint size) {
 	_overlayTexture = 0;
 	_mouseCursorTexture = 0;
 
-	_scaledShakeOffsetY = 0;
+	_scaledShakeXOffset = 0;
+	_scaledShakeYOffset = 0;
 
 	_firstTouch = NULL;
 	_secondTouch = NULL;
@@ -868,9 +869,9 @@ uint getSizeNextPOT(uint size) {
 - (void)setViewTransformation {
 	// Scale the shake offset according to the overlay size. We need this to
 	// adjust the overlay mouse click coordinates when an offset is set.
-	_scaledShakeOffsetY = (int)(_videoContext.shakeOffsetY / (GLfloat)_videoContext.screenHeight * CGRectGetHeight(_overlayRect));
+	_scaledShakeYOffset = (int)(_videoContext.shakeYOffset / (GLfloat)_videoContext.screenHeight * CGRectGetHeight(_overlayRect));
 
-	glUniform1f(_shakeSlot, _scaledShakeOffsetY);
+	glUniform1f(_shakeSlot, _scaledShakeYOffset);
 }
 
 - (void)clearColorBuffer {
@@ -914,12 +915,12 @@ uint getSizeNextPOT(uint size) {
 		area = &_overlayRect;
 		width = _videoContext.overlayWidth;
 		height = _videoContext.overlayHeight;
-		offsetY = _scaledShakeOffsetY;
+		offsetY = _scaledShakeYOffset;
 	} else {
 		area = &_gameScreenRect;
 		width = _videoContext.screenWidth;
 		height = _videoContext.screenHeight;
-		offsetY = _videoContext.shakeOffsetY;
+		offsetY = _videoContext.shakeYOffset;
 	}
 
 	point.x = (point.x - CGRectGetMinX(*area)) / CGRectGetWidth(*area);
diff --git a/backends/platform/iphone/iphone_common.h b/backends/platform/iphone/iphone_common.h
index 59dca84b85..a09ddd462c 100644
--- a/backends/platform/iphone/iphone_common.h
+++ b/backends/platform/iphone/iphone_common.h
@@ -61,7 +61,8 @@ struct VideoContext {
 	VideoContext() : asprectRatioCorrection(), screenWidth(), screenHeight(), overlayVisible(false),
 	                 overlayWidth(), overlayHeight(), mouseX(), mouseY(),
 	                 mouseHotspotX(), mouseHotspotY(), mouseWidth(), mouseHeight(),
-	                 mouseIsVisible(), graphicsMode(kGraphicsModeLinear), shakeOffsetY() {
+	                 mouseIsVisible(), graphicsMode(kGraphicsModeLinear),
+	                 shakeXOffset(), shakeYOffset() {
 	}
 
 	// Game screen state
@@ -83,7 +84,8 @@ struct VideoContext {
 
 	// Misc state
 	GraphicsModes graphicsMode;
-	int shakeOffsetY;
+	int shakeXOffset;
+	int shakeYOffset;
 };
 
 struct InternalEvent {
diff --git a/backends/platform/iphone/iphone_video.h b/backends/platform/iphone/iphone_video.h
index 26c32183ce..8cba07c409 100644
--- a/backends/platform/iphone/iphone_video.h
+++ b/backends/platform/iphone/iphone_video.h
@@ -69,7 +69,8 @@
 	GLint _mouseWidth, _mouseHeight;
 	GLfloat _mouseScaleX, _mouseScaleY;
 
-	int _scaledShakeOffsetY;
+	int _scaledShakeXOffset;
+	int _scaledShakeYOffset;
 	CGFloat _contentScaleFactor;
 
 	UITouch *_firstTouch;
diff --git a/backends/platform/iphone/iphone_video.mm b/backends/platform/iphone/iphone_video.mm
index 9e521de179..1866bf5f96 100644
--- a/backends/platform/iphone/iphone_video.mm
+++ b/backends/platform/iphone/iphone_video.mm
@@ -191,7 +191,8 @@ const char *iPhone_getDocumentsDir() {
 	_overlayTexture = 0;
 	_mouseCursorTexture = 0;
 
-	_scaledShakeOffsetY = 0;
+	_scaledShakeXOffset = 0;
+	_scaledShakeYOffset = 0;
 
 	_firstTouch = NULL;
 	_secondTouch = NULL;
@@ -567,10 +568,10 @@ const char *iPhone_getDocumentsDir() {
 
 	// Scale the shake offset according to the overlay size. We need this to
 	// adjust the overlay mouse click coordinates when an offset is set.
-	_scaledShakeOffsetY = (int)(_videoContext.shakeOffsetY / (GLfloat)_videoContext.screenHeight * CGRectGetHeight(_overlayRect));
+	_scaledShakeYOffset = (int)(_videoContext.shakeYOffset / (GLfloat)_videoContext.screenHeight * CGRectGetHeight(_overlayRect));
 
-	// Apply the shakeing to the output screen.
-	glTranslatef(0, -_scaledShakeOffsetY, 0);
+	// Apply the shaking to the output screen.
+	glTranslatef(0, -_scaledShakeYOffset, 0);
 }
 
 - (void)clearColorBuffer {
@@ -641,12 +642,12 @@ const char *iPhone_getDocumentsDir() {
 		area = &_overlayRect;
 		width = _videoContext.overlayWidth;
 		height = _videoContext.overlayHeight;
-		offsetY = _scaledShakeOffsetY;
+		offsetY = _scaledShakeYOffset;
 	} else {
 		area = &_gameScreenRect;
 		width = _videoContext.screenWidth;
 		height = _videoContext.screenHeight;
-		offsetY = _videoContext.shakeOffsetY;
+		offsetY = _videoContext.shakeYOffset;
 	}
 
 	point.x = (point.x - CGRectGetMinX(*area)) / CGRectGetWidth(*area);
diff --git a/backends/platform/iphone/osys_main.h b/backends/platform/iphone/osys_main.h
index 6aa77e291d..427d8063e4 100644
--- a/backends/platform/iphone/osys_main.h
+++ b/backends/platform/iphone/osys_main.h
@@ -147,7 +147,7 @@ public:
 	virtual void updateScreen();
 	virtual Graphics::Surface *lockScreen();
 	virtual void unlockScreen();
-	virtual void setShakePos(int shakeOffset);
+	virtual void setShakePos(int shakeXOffset, int shakeYOffset);
 
 	virtual void showOverlay();
 	virtual void hideOverlay();
diff --git a/backends/platform/iphone/osys_video.mm b/backends/platform/iphone/osys_video.mm
index f07160d350..a5dca7ffb7 100644
--- a/backends/platform/iphone/osys_video.mm
+++ b/backends/platform/iphone/osys_video.mm
@@ -72,7 +72,8 @@ void OSystem_IPHONE::initSize(uint width, uint height, const Graphics::PixelForm
 
 	_videoContext->screenWidth = width;
 	_videoContext->screenHeight = height;
-	_videoContext->shakeOffsetY = 0;
+	_videoContext->shakeXOffset = 0;
+	_videoContext->shakeYOffset = 0;
 
 	// In case we use the screen texture as frame buffer we reset the pixels
 	// pointer here to avoid freeing the screen texture.
@@ -282,9 +283,10 @@ void OSystem_IPHONE::unlockScreen() {
 	dirtyFullScreen();
 }
 
-void OSystem_IPHONE::setShakePos(int shakeOffset) {
-	//printf("setShakePos(%i)\n", shakeOffset);
-	_videoContext->shakeOffsetY = shakeOffset;
+void OSystem_IPHONE::setShakePos(int shakeXOffset, int shakeYOffset) {
+	//printf("setShakePos(%i, %i)\n", shakeXOffset, shakeYOffset);
+	_videoContext->shakeXOffset = shakeXOffset;
+	_videoContext->shakeYOffset = shakeYOffset;
 	[g_iPhoneViewInstance performSelectorOnMainThread:@selector(setViewTransformation) withObject:nil waitUntilDone: YES];
 	// HACK: We use this to force a redraw.
 	_mouseDirty = true;
diff --git a/backends/platform/n64/osys_n64.h b/backends/platform/n64/osys_n64.h
index 75a15b4d17..5ad4e00b28 100644
--- a/backends/platform/n64/osys_n64.h
+++ b/backends/platform/n64/osys_n64.h
@@ -97,7 +97,8 @@ protected:
 	uint8 _offscrPixels; // Pixels to skip on each line before start drawing, used to center image
 	uint8 _maxFps; // Max frames-per-second which can be shown on screen
 
-	int _shakeOffset;
+	int _shakeXOffset;
+	int _shakeYOffset;
 
 	uint8 *_cursor_pal; // Cursor buffer, palettized
 	uint16 *_cursor_hic; // Cursor buffer, 16bit
@@ -163,7 +164,7 @@ public:
 	virtual void updateScreen();
 	virtual Graphics::Surface *lockScreen();
 	virtual void unlockScreen();
-	virtual void setShakePos(int shakeOffset);
+	virtual void setShakePos(int shakeXOffset, int shakeYOffset);
 
 	virtual void showOverlay();
 	virtual void hideOverlay();
diff --git a/backends/platform/n64/osys_n64_base.cpp b/backends/platform/n64/osys_n64_base.cpp
index 1ad90cb014..357bdf2584 100644
--- a/backends/platform/n64/osys_n64_base.cpp
+++ b/backends/platform/n64/osys_n64_base.cpp
@@ -90,7 +90,8 @@ OSystem_N64::OSystem_N64() {
 
 	_overlayVisible = false;
 
-	_shakeOffset = 0;
+	_shakeXOffset = 0;
+	_shakeYOffset = 0;
 
 	// Allocate memory for offscreen buffers
 	_offscreen_hic = (uint16 *)memalign(8, _screenWidth * _screenHeight * 2);
@@ -512,8 +513,8 @@ void OSystem_N64::updateScreen() {
 	// Copy the game buffer to screen
 	if (!_overlayVisible) {
 		tmpDst = game_framebuffer;
-		tmpSrc = _offscreen_hic + (_shakeOffset * _screenWidth);
-		for (currentHeight = _shakeOffset; currentHeight < _gameHeight; currentHeight++) {
+		tmpSrc = _offscreen_hic + (_shakeYOffset * _screenWidth);
+		for (currentHeight = _shakeYOffset; currentHeight < _gameHeight; currentHeight++) {
 			uint64 *game_dest = (uint64 *)(tmpDst + skip_pixels + _offscrPixels);
 			uint64 *game_src = (uint64 *)tmpSrc;
 
@@ -525,7 +526,7 @@ void OSystem_N64::updateScreen() {
 			tmpSrc += _screenWidth;
 		}
 
-		uint16 _clearLines = _shakeOffset; // When shaking we must take care of remaining lines to clear
+		uint16 _clearLines = _shakeYOffset; // When shaking we must take care of remaining lines to clear
 		while (_clearLines--) {
 			memset(tmpDst + skip_pixels + _offscrPixels, 0, _screenWidth * 2);
 			tmpDst += _frameBufferWidth;
@@ -599,13 +600,14 @@ void OSystem_N64::unlockScreen() {
 	_dirtyOffscreen = true;
 }
 
-void OSystem_N64::setShakePos(int shakeOffset) {
+void OSystem_N64::setShakePos(int shakeXOffset, int shakeYOffset) {
 
 	// If a rumble pak is plugged in and screen shakes, rumble!
-	if (shakeOffset && _controllerHasRumble) rumblePakEnable(1, _controllerPort);
-	else if (!shakeOffset && _controllerHasRumble) rumblePakEnable(0, _controllerPort);
+	if (shakeYOffset && _controllerHasRumble) rumblePakEnable(1, _controllerPort);
+	else if (!shakeYOffset && _controllerHasRumble) rumblePakEnable(0, _controllerPort);
 
-	_shakeOffset = shakeOffset;
+	_shakeXOffset = shakeXOffset;
+	_shakeYOffset = shakeYOffset;
 	_dirtyOffscreen = true;
 
 	return;
@@ -654,8 +656,8 @@ void OSystem_N64::clearOverlay() {
 	uint8 skip_pixels = (_screenWidth - _gameWidth) / 2; // Center horizontally the image
 
 	uint16 *tmpDst = _overlayBuffer + (_overlayWidth * skip_lines * 2);
-	uint16 *tmpSrc = _offscreen_hic + (_shakeOffset * _screenWidth);
-	for (uint16 currentHeight = _shakeOffset; currentHeight < _gameHeight; currentHeight++) {
+	uint16 *tmpSrc = _offscreen_hic + (_shakeYOffset * _screenWidth);
+	for (uint16 currentHeight = _shakeYOffset; currentHeight < _gameHeight; currentHeight++) {
 		memcpy((tmpDst + skip_pixels), tmpSrc, _gameWidth * 2);
 		tmpDst += _overlayWidth;
 		tmpSrc += _screenWidth;
diff --git a/backends/platform/ps2/Gs2dScreen.cpp b/backends/platform/ps2/Gs2dScreen.cpp
index a11d70162e..da7d6aadfa 100644
--- a/backends/platform/ps2/Gs2dScreen.cpp
+++ b/backends/platform/ps2/Gs2dScreen.cpp
@@ -309,7 +309,8 @@ Gs2dScreen::Gs2dScreen(uint16 width, uint16 height) {
 	_mouseScaleY = (_tvHeight << 8) / _height;
 	setMouseXy(_width / 2, _height / 2);
 	_mTraCol = 255;
-	_shakePos = 0;
+	_shakeXOffset = 0;
+	_shakeYOffset = 0;
 
 	_overlayFormat.bytesPerPixel = 2;
 
@@ -678,10 +679,10 @@ int16 Gs2dScreen::getOverlayHeight(void) {
 	return _height; // _videoMode.overlayHeight;
 }
 
-void Gs2dScreen::setShakePos(int shake) {
-	_shakePos = (shake * _mouseScaleY) >> 8;
-	_blitCoords[0].y = SCALE(_shakePos) + ORIGIN_Y;
-	_blitCoords[1].y = SCALE(_tvHeight + _shakePos) + ORIGIN_Y;
+void Gs2dScreen::setShakePos(int shakeXOffset, int shakeYOffset) {
+	_shakeYOffset = (shakeYOffset * _mouseScaleY) >> 8;
+	_blitCoords[0].y = SCALE(_shakeYOffset) + ORIGIN_Y;
+	_blitCoords[1].y = SCALE(_tvHeight + _shakeYOffset) + ORIGIN_Y;
 }
 
 void Gs2dScreen::copyPrintfOverlay(const uint8 *buf) {
diff --git a/backends/platform/ps2/Gs2dScreen.h b/backends/platform/ps2/Gs2dScreen.h
index 9ed62da2d0..d8ad25e058 100644
--- a/backends/platform/ps2/Gs2dScreen.h
+++ b/backends/platform/ps2/Gs2dScreen.h
@@ -76,7 +76,7 @@ public:
 	void setMouseOverlay(const uint8 *buf, uint16 width, uint16 height, uint16 hotSpotX, uint16 hotSpotY, uint8 transpCol);
 	void showMouse(bool show);
 	void setMouseXy(int16 x, int16 y);
-	void setShakePos(int shake);
+	void setShakePos(int shakeXOffset, int shakeYOffset);
 
 	void playAnim(void);
 	void wantAnim(bool runIt);
@@ -123,7 +123,8 @@ private:
 	uint32 _mouseScaleX, _mouseScaleY;
 	uint8  _mTraCol;
 
-	int _shakePos;
+	int _shakeXOffset;
+	int _shakeYOffset;
 
 	bool _showMouse, _showOverlay, _screenChanged, _overlayChanged, _clutChanged;
 	uint16 *_overlayBuf;
diff --git a/backends/platform/ps2/systemps2.cpp b/backends/platform/ps2/systemps2.cpp
index a20ac6ada9..2a8f2d65d0 100644
--- a/backends/platform/ps2/systemps2.cpp
+++ b/backends/platform/ps2/systemps2.cpp
@@ -731,8 +731,8 @@ FilesystemFactory *OSystem_PS2::getFilesystemFactory() {
 	return &Ps2FilesystemFactory::instance();
 }
 
-void OSystem_PS2::setShakePos(int shakeOffset) {
-	_screen->setShakePos(shakeOffset);
+void OSystem_PS2::setShakePos(int shakeXOffset, int shakeYOffset) {
+	_screen->setShakePos(shakeXOffset, shakeYOffset);
 }
 
 bool OSystem_PS2::showMouse(bool visible) {
diff --git a/backends/platform/ps2/systemps2.h b/backends/platform/ps2/systemps2.h
index 019c3634a0..e11d320d78 100644
--- a/backends/platform/ps2/systemps2.h
+++ b/backends/platform/ps2/systemps2.h
@@ -65,7 +65,7 @@ protected:
 public:
 
 	virtual void copyRectToScreen(const void *buf, int pitch, int x, int y, int w, int h);
-	virtual void setShakePos(int shakeOffset);
+	virtual void setShakePos(int shakeXOffset, int shakeYOffset);
 	virtual Graphics::Surface *lockScreen();
 	virtual void unlockScreen();
 	virtual void updateScreen();
diff --git a/backends/platform/psp/default_display_client.cpp b/backends/platform/psp/default_display_client.cpp
index 1f0cef2e6c..91183a2238 100644
--- a/backends/platform/psp/default_display_client.cpp
+++ b/backends/platform/psp/default_display_client.cpp
@@ -157,9 +157,10 @@ void Screen::init() {
 	_renderer.setFullScreen(true);
 }
 
-void Screen::setShakePos(int pos) {
-	_shakePos = pos;
-	_renderer.setOffsetOnScreen(0, pos);
+void Screen::setShakePos(int shakeXOffset, int shakeYOffset) {
+	_shakeXOffset = shakeXOffset;
+	_shakeYOffset = shakeYOffset;
+	_renderer.setOffsetOnScreen(0, shakeYOffset);
 	setDirty();
 }
 
diff --git a/backends/platform/psp/default_display_client.h b/backends/platform/psp/default_display_client.h
index f2972e0b49..ed7239720e 100644
--- a/backends/platform/psp/default_display_client.h
+++ b/backends/platform/psp/default_display_client.h
@@ -78,14 +78,14 @@ public:
  */
 class Screen : public DefaultDisplayClient {
 public:
-	Screen() : _shakePos(0) {
+	Screen() : _shakeXOffset(0), _shakeYOffset(0) {
 		memset(&_pixelFormat, 0, sizeof(_pixelFormat));
 		memset(&_frameBuffer, 0, sizeof(_frameBuffer));
 	}
 
 	void init();
 	bool allocate();
-	void setShakePos(int pos);
+	void setShakePos(int shakeXOffset, int shakeYOffset);
 	void setScummvmPixelFormat(const Graphics::PixelFormat *format);
 	const Graphics::PixelFormat &getScummvmPixelFormat() const { return _pixelFormat; }
 	Graphics::Surface *lockAndGetForEditing();
@@ -93,7 +93,8 @@ public:
 	void setSize(uint32 width, uint32 height);
 
 private:
-	uint32 _shakePos;
+	uint32 _shakeXOffset;
+	uint32 _shakeYOffset;
 	Graphics::PixelFormat _pixelFormat;
 	Graphics::Surface _frameBuffer;
 };
diff --git a/backends/platform/psp/osys_psp.cpp b/backends/platform/psp/osys_psp.cpp
index 006305c6fd..a65840669b 100644
--- a/backends/platform/psp/osys_psp.cpp
+++ b/backends/platform/psp/osys_psp.cpp
@@ -231,11 +231,11 @@ void OSystem_PSP::updateScreen() {
 	_pendingUpdate = !_displayManager.renderAll();	// if we didn't update, we have a pending update
 }
 
-void OSystem_PSP::setShakePos(int shakeOffset) {
+void OSystem_PSP::setShakePos(int shakeXOffset, int shakeYOffset) {
 	DEBUG_ENTER_FUNC();
 	_displayManager.waitUntilRenderFinished();
 	_pendingUpdate = false;
-	_screen.setShakePos(shakeOffset);
+	_screen.setShakePos(shakeXOffset, shakeYOffset);
 }
 
 void OSystem_PSP::showOverlay() {
diff --git a/backends/platform/psp/osys_psp.h b/backends/platform/psp/osys_psp.h
index 58354bfbce..ff9dd101d2 100644
--- a/backends/platform/psp/osys_psp.h
+++ b/backends/platform/psp/osys_psp.h
@@ -102,7 +102,7 @@ public:
 	Graphics::Surface *lockScreen();
 	void unlockScreen();
 	void updateScreen();
-	void setShakePos(int shakeOffset);
+	void setShakePos(int shakeXOffset, int shakeYOffset);
 
 	// Overlay related
 	void showOverlay();
diff --git a/backends/platform/wii/osystem.h b/backends/platform/wii/osystem.h
index 5482eb7d49..6481d61d15 100644
--- a/backends/platform/wii/osystem.h
+++ b/backends/platform/wii/osystem.h
@@ -173,7 +173,7 @@ public:
 	virtual void updateScreen();
 	virtual Graphics::Surface *lockScreen();
 	virtual void unlockScreen();
-	virtual void setShakePos(int shakeOffset);
+	virtual void setShakePos(int shakeXOffset, int shakeYOffset);
 
 	virtual void showOverlay();
 	virtual void hideOverlay();
diff --git a/backends/platform/wii/osystem_gfx.cpp b/backends/platform/wii/osystem_gfx.cpp
index 932ca3814c..8c104fb075 100644
--- a/backends/platform/wii/osystem_gfx.cpp
+++ b/backends/platform/wii/osystem_gfx.cpp
@@ -544,9 +544,9 @@ void OSystem_Wii::unlockScreen() {
 	_gameDirty = true;
 }
 
-void OSystem_Wii::setShakePos(int shakeOffset) {
+void OSystem_Wii::setShakePos(int shakeXOffset, int shakeYOffset) {
 	gfx_coords(&_coordsGame, &_texGame, GFX_COORD_FULLSCREEN);
-	_coordsGame.y -= f32(shakeOffset) * _currentYScale;
+	_coordsGame.y -= f32(shakeYOffset) * _currentYScale;
 }
 
 void OSystem_Wii::showOverlay() {