From 814f9a141ecbb5dedc53d7e9cd981e71eaa2b68a Mon Sep 17 00:00:00 2001
From: Ioannis Tsakpinis <iotsakp@gmail.com>
Date: Thu, 23 Aug 2012 10:36:12 +0000
Subject: [PATCH] Attempt to fix lost key up events when Display is out of
 focus. (Windows)

---
 src/java/org/lwjgl/opengl/WindowsDisplay.java    | 12 +++---------
 src/java/org/lwjgl/opengl/WindowsKeyboard.java   | 16 +++++++++++++---
 .../windows/org_lwjgl_opengl_WindowsKeyboard.c   |  4 ++++
 3 files changed, 20 insertions(+), 12 deletions(-)

diff --git a/src/java/org/lwjgl/opengl/WindowsDisplay.java b/src/java/org/lwjgl/opengl/WindowsDisplay.java
index c30c1896..2986109f 100644
--- a/src/java/org/lwjgl/opengl/WindowsDisplay.java
+++ b/src/java/org/lwjgl/opengl/WindowsDisplay.java
@@ -345,6 +345,9 @@ final class WindowsDisplay implements DisplayImplementation {
 			redoMakeContextCurrent = true;
 			if (Display.isFullscreen())
 				updateClipping();
+
+			if ( keyboard != null )
+				keyboard.fireLostKeyEvents();
 		} else if (Display.isFullscreen()) {
 			showWindow(getHwnd(), SW_SHOWMINNOACTIVE);
 			resetDisplayMode();
@@ -1045,15 +1048,6 @@ final class WindowsDisplay implements DisplayImplementation {
 		return height;
 	}
 
-	private int firstMouseButtonDown() {
-		for(int i=0; i<Mouse.getButtonCount(); i++) {
-			if(Mouse.isButtonDown(i)) {
-				return i;
-			}
-		}
-		return -1;
-	}
-
 	private native boolean nTrackMouseEvent(long hwnd);
 
 	public boolean isInsideWindow() {
diff --git a/src/java/org/lwjgl/opengl/WindowsKeyboard.java b/src/java/org/lwjgl/opengl/WindowsKeyboard.java
index 92ab1492..5f871274 100644
--- a/src/java/org/lwjgl/opengl/WindowsKeyboard.java
+++ b/src/java/org/lwjgl/opengl/WindowsKeyboard.java
@@ -49,8 +49,8 @@ final class WindowsKeyboard {
 	private static final int BUFFER_SIZE = 50;
 
 	private final long hwnd;
-	private final ByteBuffer keyboard_state;
 	private final byte[] key_down_buffer = new byte[Keyboard.KEYBOARD_SIZE];
+	private final byte[] virt_key_down_buffer = new byte[Keyboard.KEYBOARD_SIZE];
 	private final EventQueue event_queue = new EventQueue(Keyboard.EVENT_SIZE);
 	private final ByteBuffer tmp_event = ByteBuffer.allocate(Keyboard.EVENT_SIZE);
 
@@ -65,7 +65,6 @@ final class WindowsKeyboard {
 
 	WindowsKeyboard(long hwnd) throws LWJGLException {
 		this.hwnd = hwnd;
-		keyboard_state = BufferUtils.createByteBuffer(256);
 	}
 	private static native boolean isWindowsNT();
 
@@ -99,6 +98,7 @@ final class WindowsKeyboard {
 	private static native int ToAscii(int wVirtKey, int wScanCode, ByteBuffer lpKeyState, ByteBuffer lpChar, int flags);
 	private static native int GetKeyboardState(ByteBuffer lpKeyState);
 	private static native int GetKeyState(int virt_key);
+	private static native int GetAsyncKeyState(int virt_key);
 
 	private void putEvent(int keycode, byte state, int ch, long millis, boolean repeat) {
 		tmp_event.clear();
@@ -155,8 +155,10 @@ final class WindowsKeyboard {
 		flushRetained();
 		has_retained_event = true;
 		int keycode = WindowsKeycodes.mapVirtualKeyToLWJGLCode(virt_key);
-		if (keycode < key_down_buffer.length)
+		if (keycode < key_down_buffer.length) {
 			key_down_buffer[keycode] = event_state;
+			virt_key_down_buffer[virt_key] = event_state;
+		}
 		retained_key_code = keycode;
 		retained_state = event_state;
 		retained_millis = millis;
@@ -164,6 +166,14 @@ final class WindowsKeyboard {
 		retained_repeat = repeat;
 	}
 
+
+	public void fireLostKeyEvents() {
+		for ( int i = 0; i < virt_key_down_buffer.length; i++ ) {
+			if ( (virt_key_down_buffer[i] & 1) == 1 && (GetAsyncKeyState(i) & 1) == 0 )
+				handleKey(i, 0, false, (byte)0, System.currentTimeMillis(), false);
+		}
+	}
+
 	public void handleChar(int event_char, long millis, boolean repeat) {
 		if (has_retained_event && retained_char != 0)
 			flushRetained();
diff --git a/src/native/windows/org_lwjgl_opengl_WindowsKeyboard.c b/src/native/windows/org_lwjgl_opengl_WindowsKeyboard.c
index b3176fa1..10349cb4 100644
--- a/src/native/windows/org_lwjgl_opengl_WindowsKeyboard.c
+++ b/src/native/windows/org_lwjgl_opengl_WindowsKeyboard.c
@@ -45,6 +45,10 @@ JNIEXPORT jint JNICALL Java_org_lwjgl_opengl_WindowsKeyboard_GetKeyState(JNIEnv
 	return GetKeyState(virt_key);
 }
 
+JNIEXPORT jint JNICALL Java_org_lwjgl_opengl_WindowsKeyboard_GetAsyncKeyState(JNIEnv *env, jclass unused, jint virt_key) {
+	return GetAsyncKeyState(virt_key);
+}
+
 JNIEXPORT jint JNICALL Java_org_lwjgl_opengl_WindowsKeyboard_MapVirtualKey(JNIEnv *env, jclass unused, jint uCode, jint uMapType) {
 	return MapVirtualKey(uCode, uMapType);
 }