diff --git a/src/main/java/ru/windcorp/optica/client/graphics/GUI.java b/src/main/java/ru/windcorp/optica/client/graphics/GUI.java
index a476c08..75b6a2d 100644
--- a/src/main/java/ru/windcorp/optica/client/graphics/GUI.java
+++ b/src/main/java/ru/windcorp/optica/client/graphics/GUI.java
@@ -20,6 +20,10 @@ package ru.windcorp.optica.client.graphics;
 import java.util.ArrayList;
 import java.util.List;
 
+import com.google.common.eventbus.Subscribe;
+
+import ru.windcorp.optica.client.graphics.input.FrameResizeEvent;
+
 public class GUI {
 	
 	private static final List<Layer> LAYERS = new ArrayList<>();
@@ -44,4 +48,19 @@ public class GUI {
 		}
 	}
 
+	public static void invalidateEverything() {
+		LAYERS.forEach(Layer::invalidate);
+	}
+	
+	public static Object getEventSubscriber() {
+		return new Object() {
+			
+			@Subscribe
+			public void onFrameResized(FrameResizeEvent event) {
+				GUI.invalidateEverything();
+			}
+			
+		};
+	}
+
 }
diff --git a/src/main/java/ru/windcorp/optica/client/graphics/Layer.java b/src/main/java/ru/windcorp/optica/client/graphics/Layer.java
index 4b0a384..7d017e1 100644
--- a/src/main/java/ru/windcorp/optica/client/graphics/Layer.java
+++ b/src/main/java/ru/windcorp/optica/client/graphics/Layer.java
@@ -17,13 +17,18 @@
  *******************************************************************************/
 package ru.windcorp.optica.client.graphics;
 
+import java.util.concurrent.atomic.AtomicBoolean;
+
 import ru.windcorp.optica.client.graphics.backend.GraphicsInterface;
 
 public abstract class Layer {
 	
 	private final String name;
+	
 	private boolean hasInitialized = false;
 	
+	private final AtomicBoolean isValid = new AtomicBoolean(false);
+	
 	public Layer(String name) {
 		this.name = name;
 	}
@@ -33,7 +38,9 @@ public abstract class Layer {
 		return "Layer " + name;
 	}
 	
-	public void render() {
+	void render() {
+		validate();
+		
 		if (!hasInitialized) {
 			initialize();
 			hasInitialized = true;
@@ -42,16 +49,28 @@ public abstract class Layer {
 		doRender();
 	}
 	
+	void validate() {
+		if (isValid.compareAndSet(false, true)) {
+			doValidate();
+		}
+	}
+	
+	public void invalidate() {
+		isValid.set(false);
+	}
+	
 	protected abstract void initialize();
+	
+	protected abstract void doValidate();
 
 	protected abstract void doRender();
 	
 	protected int getWidth() {
-		return GraphicsInterface.getFramebufferWidth();
+		return GraphicsInterface.getFrameWidth();
 	}
 	
 	protected int getHeight() {
-		return GraphicsInterface.getFramebufferHeight();
+		return GraphicsInterface.getFrameHeight();
 	}
 
 }
diff --git a/src/main/java/ru/windcorp/optica/client/graphics/backend/GraphicsBackend.java b/src/main/java/ru/windcorp/optica/client/graphics/backend/GraphicsBackend.java
index bd52e70..5aa8aab 100644
--- a/src/main/java/ru/windcorp/optica/client/graphics/backend/GraphicsBackend.java
+++ b/src/main/java/ru/windcorp/optica/client/graphics/backend/GraphicsBackend.java
@@ -18,6 +18,9 @@
 package ru.windcorp.optica.client.graphics.backend;
 
 import static org.lwjgl.opengl.GL11.*;
+
+import glm.vec._2.i.Vec2i;
+
 import static org.lwjgl.glfw.GLFW.*;
 
 public class GraphicsBackend {
@@ -26,8 +29,7 @@ public class GraphicsBackend {
 	
 	private static long windowHandle;
 	
-	private static int framebufferWidth;
-	private static int framebufferHeight;
+	private static final Vec2i FRAME_SIZE = new Vec2i();
 	
 	private static double frameLength = 1.0 / 60; // TODO do something about it
 	private static int framesRendered = 0;
@@ -56,21 +58,25 @@ public class GraphicsBackend {
 		return windowHandle;
 	}
 	
-	public static int getFramebufferWidth() {
-		return framebufferWidth;
+	public static int getFrameWidth() {
+		return FRAME_SIZE.x;
 	}
 
-	public static int getFramebufferHeight() {
-		return framebufferHeight;
+	public static int getFrameHeight() {
+		return FRAME_SIZE.y;
+	}
+	
+	public static Vec2i getFrameSize() {
+		return FRAME_SIZE;
 	}
 
-	static void onFramebufferResized(long window, int newWidth, int newHeight) {
+	static void onFrameResized(long window, int newWidth, int newHeight) {
 		if (window != windowHandle) return;
 		
-		framebufferWidth = newWidth;
-		framebufferHeight = newHeight;
+		InputHandler.handleFrameResize(newWidth, newHeight);
+		FRAME_SIZE.set(newWidth, newHeight);
 		
-		glViewport(0, 0, framebufferWidth, framebufferHeight);
+		glViewport(0, 0, newWidth, newHeight);
 	}
 
 	static void startFrame() {
diff --git a/src/main/java/ru/windcorp/optica/client/graphics/backend/GraphicsInterface.java b/src/main/java/ru/windcorp/optica/client/graphics/backend/GraphicsInterface.java
index 42f6937..94a69f7 100644
--- a/src/main/java/ru/windcorp/optica/client/graphics/backend/GraphicsInterface.java
+++ b/src/main/java/ru/windcorp/optica/client/graphics/backend/GraphicsInterface.java
@@ -18,6 +18,7 @@
 package ru.windcorp.optica.client.graphics.backend;
 
 import glm.vec._2.d.Vec2d;
+import glm.vec._2.i.Vec2i;
 
 public class GraphicsInterface {
 	
@@ -31,16 +32,20 @@ public class GraphicsInterface {
 		return Thread.currentThread() == getRenderThread();
 	}
 	
-	public static int getFramebufferWidth() {
-		return GraphicsBackend.getFramebufferWidth();
+	public static int getFrameWidth() {
+		return GraphicsBackend.getFrameWidth();
 	}
 	
-	public static int getFramebufferHeight() {
-		return GraphicsBackend.getFramebufferHeight();
+	public static int getFrameHeight() {
+		return GraphicsBackend.getFrameHeight();
+	}
+	
+	public static Vec2i getFrameSize() {
+		return GraphicsBackend.getFrameSize();
 	}
 	
 	public static float getAspectRatio() {
-		return ((float) getFramebufferWidth()) / getFramebufferHeight();
+		return ((float) getFrameWidth()) / getFrameHeight();
 	}
 	
 	public static double getTime() {
diff --git a/src/main/java/ru/windcorp/optica/client/graphics/backend/InputHandler.java b/src/main/java/ru/windcorp/optica/client/graphics/backend/InputHandler.java
index e040df3..87912a6 100644
--- a/src/main/java/ru/windcorp/optica/client/graphics/backend/InputHandler.java
+++ b/src/main/java/ru/windcorp/optica/client/graphics/backend/InputHandler.java
@@ -26,35 +26,16 @@ public class InputHandler {
 	
 	private static final EventBus INPUT_EVENT_BUS = new EventBus("Input");
 
-	// ScrollEvent
-
-	private static class ModifiableWheelScrollEvent extends WheelScrollEvent {
-
-		public void initialize(double xoffset, double yoffset) {
-			this.xOffset = xoffset;
-			this.yOffset = yoffset;
-		}
-
-	}
-
-	private static final ModifiableWheelScrollEvent THE_SCROLL_EVENT =
-			new ModifiableWheelScrollEvent();
-
-	static void handleMouseWheel(
-			long window,
-			double xoffset,
-			double yoffset
-	) {
-		if (GraphicsBackend.getWindowHandle() != window) return;
-		THE_SCROLL_EVENT.initialize(xoffset, yoffset);
-		dispatch(THE_SCROLL_EVENT);
-	}
-
 	// KeyEvent
 	
 	private static class ModifiableKeyEvent extends KeyEvent {
 		
+		protected ModifiableKeyEvent() {
+			super(0, 0, 0, 0, Double.NaN);
+		}
+
 		public void initialize(int key, int scancode, int action, int mods) {
+			this.setTime(GraphicsInterface.getTime());
 			this.key = key;
 			this.scancode = scancode;
 			this.action = action;
@@ -82,15 +63,18 @@ public class InputHandler {
 	
 	private static class ModifiableCursorMoveEvent extends CursorMoveEvent {
 		
+		protected ModifiableCursorMoveEvent() {
+			super(0, 0, Double.NaN);
+		}
+
 		public void initialize(double x, double y) {
-			Vec2d newPos = getNewPosition();
-			newPos.x = x;
-			newPos.y = y;
+			this.setTime(GraphicsInterface.getTime());
+			getNewPosition().set(x, y);
 		}
 		
 	}
 	
-	private static final Vec2d CURSOR_POSITION = new Vec2d().set(
+	private static final Vec2d CURSOR_POSITION = new Vec2d(
 			Double.NaN, Double.NaN
 	);
 	
@@ -113,8 +97,6 @@ public class InputHandler {
 		CURSOR_POSITION.set(x, y);
 	}
 	
-	// Misc
-	
 	public static double getCursorX() {
 		return CURSOR_POSITION.x;
 	}
@@ -126,6 +108,65 @@ public class InputHandler {
 	public static Vec2d getCursorPosition() {
 		return CURSOR_POSITION;
 	}
+
+	// ScrollEvent
+
+	private static class ModifiableWheelScrollEvent extends WheelScrollEvent {
+		
+		public ModifiableWheelScrollEvent() {
+			super(0, 0, Double.NaN);
+		}
+
+		public void initialize(double xOffset, double yOffset) {
+			this.setTime(GraphicsInterface.getTime());
+			this.getOffset().set(xOffset, yOffset);
+		}
+
+	}
+
+	private static final ModifiableWheelScrollEvent THE_WHEEL_SCROLL_EVENT =
+			new ModifiableWheelScrollEvent();
+
+	static void handleWheelScroll(
+			long window,
+			double xoffset,
+			double yoffset
+	) {
+		if (GraphicsBackend.getWindowHandle() != window) return;
+		THE_WHEEL_SCROLL_EVENT.initialize(xoffset, yoffset);
+		dispatch(THE_WHEEL_SCROLL_EVENT);
+	}
+	
+	// FrameResizeEvent
+	
+	private static class ModifiableFrameResizeEvent extends FrameResizeEvent {
+		
+		public ModifiableFrameResizeEvent() {
+			super(0, 0, Double.NaN);
+		}
+		
+		public void initialize(int width, int height) {
+			this.setTime(GraphicsInterface.getTime());
+			this.getNewSize().set(width, height);
+		}
+		
+	}
+	
+	private static final ModifiableFrameResizeEvent THE_FRAME_RESIZE_EVENT =
+			new ModifiableFrameResizeEvent();
+	
+	/*
+	 * NB: this is NOT a GLFW callback, the raw callback is in GraphicsBackend
+	 */
+	static void handleFrameResize(
+			int width,
+			int height
+	) {
+		THE_FRAME_RESIZE_EVENT.initialize(width, height);
+		dispatch(THE_FRAME_RESIZE_EVENT);
+	}
+	
+	// Misc
 	
 	private static void dispatch(InputEvent event) {
 		INPUT_EVENT_BUS.post(event);
diff --git a/src/main/java/ru/windcorp/optica/client/graphics/backend/LWJGLInitializer.java b/src/main/java/ru/windcorp/optica/client/graphics/backend/LWJGLInitializer.java
index 0d5edeb..8ecede8 100644
--- a/src/main/java/ru/windcorp/optica/client/graphics/backend/LWJGLInitializer.java
+++ b/src/main/java/ru/windcorp/optica/client/graphics/backend/LWJGLInitializer.java
@@ -23,6 +23,8 @@ import static org.lwjgl.system.MemoryUtil.*;
 
 import org.lwjgl.opengl.GL;
 
+import ru.windcorp.optica.client.graphics.GUI;
+
 class LWJGLInitializer {
 	
 	private LWJGLInitializer() {}
@@ -88,12 +90,14 @@ class LWJGLInitializer {
 		long handle = GraphicsBackend.getWindowHandle();
 
 		glfwSetFramebufferSizeCallback(handle,
-				GraphicsBackend::onFramebufferResized);
+				GraphicsBackend::onFrameResized);
 		
 		glfwSetKeyCallback(handle, InputHandler::handleKeyInput);
 		glfwSetCursorPosCallback(handle, InputHandler::handleMouseMoveInput);
 
-		glfwSetScrollCallback(handle, InputHandler::handleMouseWheel);
+		glfwSetScrollCallback(handle, InputHandler::handleWheelScroll);
+		
+		GraphicsInterface.subscribeToInputEvents(GUI.getEventSubscriber());
 	}
 
 }
diff --git a/src/main/java/ru/windcorp/optica/client/graphics/flat/AssembledFlatLayer.java b/src/main/java/ru/windcorp/optica/client/graphics/flat/AssembledFlatLayer.java
index f246ee7..ad0a27f 100644
--- a/src/main/java/ru/windcorp/optica/client/graphics/flat/AssembledFlatLayer.java
+++ b/src/main/java/ru/windcorp/optica/client/graphics/flat/AssembledFlatLayer.java
@@ -26,7 +26,6 @@ public abstract class AssembledFlatLayer extends Layer {
 	
 	private final RenderTarget target = new RenderTarget();
 	
-	private boolean needsReassembly = true;
 	private RenderTarget.Clip[] clips = null;
 	
 	public AssembledFlatLayer(String name) {
@@ -39,24 +38,16 @@ public abstract class AssembledFlatLayer extends Layer {
 		
 	}
 	
-	public void markForReassembly() {
-		needsReassembly = true;
-	}
-	
-	private void doReassemble() {
+	@Override
+	protected void doValidate() {
 		assemble(target);
 		clips = target.assemble();
-		needsReassembly = false;
 	}
 	
 	protected abstract void assemble(RenderTarget target);
 	
 	@Override
 	protected void doRender() {
-		if (needsReassembly) {
-			doReassemble();
-		}
-		
 		for (RenderTarget.Clip clip : clips) {
 			clip.render(helper);
 		}
diff --git a/src/main/java/ru/windcorp/optica/client/graphics/flat/FlatRenderHelper.java b/src/main/java/ru/windcorp/optica/client/graphics/flat/FlatRenderHelper.java
index 45f9cc5..ec39961 100644
--- a/src/main/java/ru/windcorp/optica/client/graphics/flat/FlatRenderHelper.java
+++ b/src/main/java/ru/windcorp/optica/client/graphics/flat/FlatRenderHelper.java
@@ -33,8 +33,8 @@ public abstract class FlatRenderHelper extends ShapeRenderHelper {
 	
 	@Override
 	public Mat4 getFinalTransform() {
-		float width = GraphicsInterface.getFramebufferWidth();
-		float height = GraphicsInterface.getFramebufferHeight();
+		float width = GraphicsInterface.getFrameWidth();
+		float height = GraphicsInterface.getFrameHeight();
 		
 		return finalTransform.identity().translate(-1, +1, 0)
 	              .scale(2 / width, -2 / height, 1 / MAX_DEPTH)
diff --git a/src/main/java/ru/windcorp/optica/client/graphics/flat/LayerTestUI.java b/src/main/java/ru/windcorp/optica/client/graphics/flat/LayerTestUI.java
index 16d73aa..cb08fab 100644
--- a/src/main/java/ru/windcorp/optica/client/graphics/flat/LayerTestUI.java
+++ b/src/main/java/ru/windcorp/optica/client/graphics/flat/LayerTestUI.java
@@ -133,7 +133,7 @@ public class LayerTestUI extends AssembledFlatLayer {
 		}
 		
 		flag = event.isPress();
-		markForReassembly();
+		invalidate();
 	}
 	
 	/*
diff --git a/src/main/java/ru/windcorp/optica/client/graphics/flat/TransformedMask.java b/src/main/java/ru/windcorp/optica/client/graphics/flat/TransformedMask.java
index 829191b..eb5f492 100644
--- a/src/main/java/ru/windcorp/optica/client/graphics/flat/TransformedMask.java
+++ b/src/main/java/ru/windcorp/optica/client/graphics/flat/TransformedMask.java
@@ -106,7 +106,7 @@ public class TransformedMask {
 	}
 
 	private void flipY() {
-		float height = GraphicsInterface.getFramebufferHeight();
+		float height = GraphicsInterface.getFrameHeight();
 		
 		startXstartY.y = height - startXstartY.y;
 		startXendY.y = height - startXendY.y;
diff --git a/src/main/java/ru/windcorp/optica/client/graphics/input/CursorEvent.java b/src/main/java/ru/windcorp/optica/client/graphics/input/CursorEvent.java
index 9483e28..62f058c 100644
--- a/src/main/java/ru/windcorp/optica/client/graphics/input/CursorEvent.java
+++ b/src/main/java/ru/windcorp/optica/client/graphics/input/CursorEvent.java
@@ -22,6 +22,10 @@ import ru.windcorp.optica.client.graphics.backend.GraphicsInterface;
 
 public abstract class CursorEvent extends InputEvent {
 	
+	public CursorEvent(double time) {
+		super(time);
+	}
+
 	public double getCursorX() {
 		return GraphicsInterface.getCursorX();
 	}
diff --git a/src/main/java/ru/windcorp/optica/client/graphics/input/CursorMoveEvent.java b/src/main/java/ru/windcorp/optica/client/graphics/input/CursorMoveEvent.java
index 6c04d2b..7f3a6b3 100644
--- a/src/main/java/ru/windcorp/optica/client/graphics/input/CursorMoveEvent.java
+++ b/src/main/java/ru/windcorp/optica/client/graphics/input/CursorMoveEvent.java
@@ -24,12 +24,13 @@ public class CursorMoveEvent extends CursorEvent {
 	
 	private final Vec2d newPosition = new Vec2d();
 
-	protected CursorMoveEvent(double newX, double newY) {
+	protected CursorMoveEvent(double newX, double newY, double time) {
+		super(time);
 		newPosition.set(newX, newY);
 	}
 	
-	protected CursorMoveEvent(Vec2d newPos) {
-		newPosition.set(newPos.x, newPos.y);
+	protected CursorMoveEvent(Vec2d newPos, double time) {
+		this(newPos.x, newPos.y, time);
 	}
 	
 	@Override
@@ -83,8 +84,6 @@ public class CursorMoveEvent extends CursorEvent {
 		return result.set(getChangeX(), getChangeY());
 	}
 	
-	protected CursorMoveEvent() {}
-	
 	@Override
 	public CursorMoveEvent snapshot() {
 		return new StaticMouseMoveEvent(
@@ -96,7 +95,6 @@ public class CursorMoveEvent extends CursorEvent {
 	
 	private class StaticMouseMoveEvent extends CursorMoveEvent {
 		
-		private final double time;
 		private final Vec2d previousPosition = new Vec2d();
 
 		public StaticMouseMoveEvent(
@@ -104,25 +102,14 @@ public class CursorMoveEvent extends CursorEvent {
 				Vec2d newPosition,
 				double time
 		) {
-			super(newPosition);
+			super(newPosition, time);
 			this.previousPosition.set(previousPosition.x, previousPosition.y);
-			this.time = time;
 		}
 		
 		@Override
 		public Vec2d getPreviousPosition() {
 			return previousPosition;
 		}
-		
-		@Override
-		public double getTime() {
-			return time;
-		}
-
-		@Override
-		public CursorMoveEvent snapshot() {
-			return this;
-		}
 
 	}
 
diff --git a/src/main/java/ru/windcorp/optica/client/graphics/input/FrameResizeEvent.java b/src/main/java/ru/windcorp/optica/client/graphics/input/FrameResizeEvent.java
new file mode 100644
index 0000000..549c2e9
--- /dev/null
+++ b/src/main/java/ru/windcorp/optica/client/graphics/input/FrameResizeEvent.java
@@ -0,0 +1,85 @@
+/*******************************************************************************
+ * Optica
+ * Copyright (C) 2020  Wind Corporation
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *******************************************************************************/
+package ru.windcorp.optica.client.graphics.input;
+
+import glm.vec._2.i.Vec2i;
+import ru.windcorp.optica.client.graphics.backend.GraphicsInterface;
+
+public class FrameResizeEvent extends InputEvent {
+
+	private final Vec2i newSize = new Vec2i();
+
+	protected FrameResizeEvent(int newWidth, int newHeight, double time) {
+		super(time);
+		this.newSize.set(newWidth, newHeight);
+	}
+	
+	protected FrameResizeEvent(Vec2i newSize, double time) {
+		this(newSize.x, newSize.y, time);
+	}
+
+	public int getNewWidth() {
+		return getNewSize().x;
+	}
+	
+	public int getNewHeight() {
+		return getNewSize().y;
+	}
+	
+	public Vec2i getNewSize() {
+		return newSize;
+	}
+	
+	public int getPreviousWidth() {
+		return getPreviousSize().x;
+	}
+	
+	public int getPreviousHeight() {
+		return getPreviousSize().y;
+	}
+	
+	public Vec2i getPreviousSize() {
+		return GraphicsInterface.getFrameSize();
+	}
+
+	@Override
+	public FrameResizeEvent snapshot() {
+		return new StaticFrameResizeEvent(getNewSize(), getPreviousSize(), getTime());
+	}
+	
+	private static class StaticFrameResizeEvent extends FrameResizeEvent {
+		
+		private final Vec2i previousSize;
+
+		public StaticFrameResizeEvent(
+				Vec2i newSize,
+				Vec2i previousSize,
+				double time
+		) {
+			super(newSize, time);
+			this.previousSize = previousSize;
+		}
+		
+		@Override
+		public Vec2i getPreviousSize() {
+			return previousSize;
+		}
+
+	}
+
+}
diff --git a/src/main/java/ru/windcorp/optica/client/graphics/input/InputEvent.java b/src/main/java/ru/windcorp/optica/client/graphics/input/InputEvent.java
index 8910bcf..cbf5fb4 100644
--- a/src/main/java/ru/windcorp/optica/client/graphics/input/InputEvent.java
+++ b/src/main/java/ru/windcorp/optica/client/graphics/input/InputEvent.java
@@ -17,12 +17,20 @@
  *******************************************************************************/
 package ru.windcorp.optica.client.graphics.input;
 
-import ru.windcorp.optica.client.graphics.backend.GraphicsInterface;
-
 public abstract class InputEvent {
 	
+	private double time;
+	
+	public InputEvent(double time) {
+		this.time = time;
+	}
+	
+	protected void setTime(double time) {
+		this.time = time;
+	}
+	
 	public double getTime() {
-		return GraphicsInterface.getTime();
+		return time;
 	}
 	
 	public abstract InputEvent snapshot();
diff --git a/src/main/java/ru/windcorp/optica/client/graphics/input/KeyEvent.java b/src/main/java/ru/windcorp/optica/client/graphics/input/KeyEvent.java
index 4493f57..275e1f9 100644
--- a/src/main/java/ru/windcorp/optica/client/graphics/input/KeyEvent.java
+++ b/src/main/java/ru/windcorp/optica/client/graphics/input/KeyEvent.java
@@ -26,14 +26,15 @@ public class KeyEvent extends InputEvent {
 	protected int action;
 	protected int mods;
 
-	protected KeyEvent(int key, int scancode, int action, int mods) {
+	protected KeyEvent(
+			int key, int scancode, int action, int mods, double time
+	) {
+		super(time);
 		this.key = key;
 		this.scancode = scancode;
 		this.action = action;
 		this.mods = mods;
 	}
-	
-	protected KeyEvent() {}
 
 	public int getKey() {
 		return key;
@@ -64,32 +65,8 @@ public class KeyEvent extends InputEvent {
 	}
 	
 	@Override
-	public InputEvent snapshot() {
-		return new StaticKeyEvent(key, scancode, action, mods, getTime());
-	}
-	
-	private class StaticKeyEvent extends KeyEvent {
-		
-		private final double time;
-
-		public StaticKeyEvent(
-				int key, int scancode, int action, int mods,
-				double time
-		) {
-			super(key, scancode, action, mods);
-			this.time = time;
-		}
-		
-		@Override
-		public double getTime() {
-			return time;
-		}
-
-		@Override
-		public InputEvent snapshot() {
-			return this;
-		}
-
+	public KeyEvent snapshot() {
+		return new KeyEvent(key, scancode, action, mods, getTime());
 	}
 
 }
diff --git a/src/main/java/ru/windcorp/optica/client/graphics/input/WheelEvent.java b/src/main/java/ru/windcorp/optica/client/graphics/input/WheelEvent.java
index 41c1aae..0e8f5af 100644
--- a/src/main/java/ru/windcorp/optica/client/graphics/input/WheelEvent.java
+++ b/src/main/java/ru/windcorp/optica/client/graphics/input/WheelEvent.java
@@ -19,7 +19,11 @@ package ru.windcorp.optica.client.graphics.input;
 
 public abstract class WheelEvent extends InputEvent {
 
-    @Override
+    public WheelEvent(double time) {
+		super(time);
+	}
+
+	@Override
     public abstract WheelEvent snapshot();
     
 }
diff --git a/src/main/java/ru/windcorp/optica/client/graphics/input/WheelScrollEvent.java b/src/main/java/ru/windcorp/optica/client/graphics/input/WheelScrollEvent.java
index 2b0f1b8..01706cf 100644
--- a/src/main/java/ru/windcorp/optica/client/graphics/input/WheelScrollEvent.java
+++ b/src/main/java/ru/windcorp/optica/client/graphics/input/WheelScrollEvent.java
@@ -17,75 +17,59 @@
  *******************************************************************************/
 package ru.windcorp.optica.client.graphics.input;
 
+import glm.vec._2.d.Vec2d;
+
 public class WheelScrollEvent extends WheelEvent {
+	
+	private final Vec2d offset = new Vec2d();
 
-    protected double xOffset;
-    protected double yOffset;
-
-    protected WheelScrollEvent(double xOffset, double yOffset) {
-        this.xOffset = xOffset;
-        this.yOffset = yOffset;
+    protected WheelScrollEvent(double xOffset, double yOffset, double time) {
+    	super(time);
+        this.offset.set(xOffset, yOffset);
+    }
+    
+    protected WheelScrollEvent(Vec2d offset, double time) {
+    	this(offset.x, offset.y, time);
     }
 
-    protected WheelScrollEvent() {}
-
     public boolean isUp() {
-    	return yOffset > 0;
+    	return getY() > 0;
     }
 
     public boolean isDown() {
-    	return yOffset < 0;
+    	return getY() < 0;
     }
 
     public boolean isRight() {
-    	return xOffset > 0;
+    	return getX() > 0;
     }
 
     public boolean isLeft() {
-    	return xOffset < 0;
+    	return getX() < 0;
     }
 
     public boolean hasVerticalMovement() {
-    	return yOffset != 0;
+    	return getY() != 0;
     }
 
     public boolean hasHorizontalMovement() {
-    	return xOffset != 0;
+    	return getX() != 0;
     }
 
     public double getX() {
-    	return xOffset;
+    	return getOffset().x;
     }
 
     public double getY() {
-    	return yOffset;
+    	return getOffset().y;
     }
+    
+    public Vec2d getOffset() {
+		return offset;
+	}
 
     @Override
     public WheelEvent snapshot() {
-        return new StaticWheelScrollEvent(xOffset, yOffset, getTime());
-    }
-
-    private class StaticWheelScrollEvent extends WheelScrollEvent {
-
-        private final double time;
-
-        public StaticWheelScrollEvent(
-        		double xOffset, double yOffset, double time
-        ) {
-            super(xOffset, yOffset);
-            this.time = time;
-        }
-
-        @Override
-        public double getTime() {
-        	return time;
-        }
-
-        @Override
-        public WheelEvent snapshot() {
-            return this;
-        }
-
+        return new WheelScrollEvent(getOffset(), getTime());
     }
 }
diff --git a/src/main/java/ru/windcorp/optica/client/graphics/world/LayerWorld.java b/src/main/java/ru/windcorp/optica/client/graphics/world/LayerWorld.java
index 7e42272..79575f9 100644
--- a/src/main/java/ru/windcorp/optica/client/graphics/world/LayerWorld.java
+++ b/src/main/java/ru/windcorp/optica/client/graphics/world/LayerWorld.java
@@ -70,6 +70,11 @@ public class LayerWorld extends Layer {
 		GraphicsInterface.subscribeToInputEvents(this);
 	}
 	
+	@Override
+	protected void doValidate() {
+		// Do nothing
+	}
+	
 	@Override
 	protected void doRender() {
 		camera.apply(helper);