partial vsync implementation, immediate continue hack

sp-server/src/main/java/net/lax1dude/eaglercraft/sp/EAGMinecraftServer.java

@@ -59,15 +59,10 @@ public class EAGMinecraftServer extends MinecraftServer {
 			this.tick();
 			lastTick = SysUtil.steadyTimeMillis();
 		} else {
-			boolean mustYield = false;
+			if (delta >= 50l) {
-			while (delta >= 50L) {
-				if(mustYield) {
-					SysUtil.sleep(1); // allow some async
-				}
 				delta -= 50L;
-				lastTick = SysUtil.steadyTimeMillis();
+				lastTick += 50l;
 				this.tick();
-				mustYield = true;
 			}
 		}
 		

sp-server/src/main/java/net/lax1dude/eaglercraft/sp/IntegratedServer.java

@@ -749,6 +749,8 @@ public class IntegratedServer {
 				sendIPCPacket(new IPCPacketFFProcessKeepAlive(IPCPacket01StopServer.ID));
 				currentProcess = null;
 			}
+		}else {
+			SysUtil.sleep(50);
 		}
 	}
 	
@@ -767,7 +769,7 @@ public class IntegratedServer {
 			
 			mainLoop();
 			
-			SysUtil.sleep(1); // allow some async to occur
+			SysUtil.immediateContinue();
 		}
 		
 		// yee

sp-server/src/main/java/net/lax1dude/eaglercraft/sp/MessageChannel.java

@@ -0,0 +1,36 @@
+package net.lax1dude.eaglercraft.sp;
+
+import org.teavm.jso.JSBody;
+import org.teavm.jso.JSClass;
+import org.teavm.jso.JSObject;
+import org.teavm.jso.JSProperty;
+import org.teavm.jso.workers.MessagePort;
+
+/**
+ * Copyright (c) 2024 lax1dude. All Rights Reserved.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ * 
+ */
+@JSClass
+public class MessageChannel implements JSObject {
+
+	@JSBody(params = { }, script = "return (typeof MessageChannel !== \"undefined\");")
+	public static native boolean supported();
+
+	@JSProperty
+	public native MessagePort getPort1();
+
+	@JSProperty
+	public native MessagePort getPort2();
+
+}

sp-server/src/main/java/net/lax1dude/eaglercraft/sp/SysUtil.java

@@ -4,6 +4,10 @@ import org.teavm.interop.Async;
 import org.teavm.interop.AsyncCallback;
 import org.teavm.jso.JSBody;
 import org.teavm.jso.JSObject;
+import org.teavm.jso.browser.Window;
+import org.teavm.jso.core.JSString;
+import org.teavm.jso.dom.events.EventListener;
+import org.teavm.jso.dom.events.MessageEvent;
 import org.teavm.platform.Platform;
 import org.teavm.platform.PlatformRunnable;
 
@@ -45,4 +49,110 @@ public class SysUtil {
 		}
 	}
 
+	private static boolean hasCheckedImmediateContinue = false;
+	private static MessageChannel immediateContinueChannel = null;
+	private static Runnable currentContinueHack = null;
+	private static final Object immediateContLock = new Object();
+	private static final JSString emptyJSString = JSString.valueOf("");
+
+	public static void immediateContinue() {
+		if(!hasCheckedImmediateContinue) {
+			hasCheckedImmediateContinue = true;
+			checkImmediateContinueSupport();
+		}
+		if(immediateContinueChannel != null) {
+			immediateContinueTeaVM();
+		}else {
+			sleep(0);
+		}
+	}
+
+	@Async
+	private static native void immediateContinueTeaVM();
+
+	private static void immediateContinueTeaVM(final AsyncCallback<Void> cb) {
+		synchronized(immediateContLock) {
+			if(currentContinueHack != null) {
+				cb.error(new IllegalStateException("Worker thread is already waiting for an immediate continue callback!"));
+				return;
+			}
+			currentContinueHack = () -> {
+				cb.complete(null);
+			};
+			try {
+				immediateContinueChannel.getPort2().postMessage(emptyJSString);
+			}catch(Throwable t) {
+				System.err.println("Caught error posting immediate continue, using setTimeout instead");
+				Window.setTimeout(() -> cb.complete(null), 0);
+			}
+		}
+	}
+
+	private static void checkImmediateContinueSupport() {
+		try {
+			immediateContinueChannel = null;
+			if(!MessageChannel.supported()) {
+				System.err.println("Fast immediate continue will be disabled for server context due to MessageChannel being unsupported");
+				return;
+			}
+			immediateContinueChannel = new MessageChannel();
+			immediateContinueChannel.getPort1().addEventListener("message", new EventListener<MessageEvent>() {
+				@Override
+				public void handleEvent(MessageEvent evt) {
+					Runnable toRun;
+					synchronized(immediateContLock) {
+						toRun = currentContinueHack;
+						currentContinueHack = null;
+					}
+					if(toRun != null) {
+						toRun.run();
+					}
+				}
+			});
+			immediateContinueChannel.getPort1().start();
+			immediateContinueChannel.getPort2().start();
+			final boolean[] checkMe = new boolean[1];
+			checkMe[0] = false;
+			currentContinueHack = () -> {
+				checkMe[0] = true;
+			};
+			immediateContinueChannel.getPort2().postMessage(emptyJSString);
+			if(checkMe[0]) {
+				currentContinueHack = null;
+				if(immediateContinueChannel != null) {
+					safeShutdownChannel(immediateContinueChannel);
+				}
+				immediateContinueChannel = null;
+				System.err.println("Fast immediate continue will be disabled for server context due to actually continuing immediately");
+				return;
+			}
+			sleep(10);
+			currentContinueHack = null;
+			if(!checkMe[0]) {
+				if(immediateContinueChannel != null) {
+					safeShutdownChannel(immediateContinueChannel);
+				}
+				immediateContinueChannel = null;
+				System.err.println("Fast immediate continue will be disabled for server context due to startup check failing");
+			}
+		}catch(Throwable t) {
+			System.err.println("Fast immediate continue will be disabled for server context due to exceptions");
+			if(immediateContinueChannel != null) {
+				safeShutdownChannel(immediateContinueChannel);
+			}
+			immediateContinueChannel = null;
+		}
+	}
+
+	private static void safeShutdownChannel(MessageChannel chan) {
+		try {
+			chan.getPort1().close();
+		}catch(Throwable tt) {
+		}
+		try {
+			chan.getPort2().close();
+		}catch(Throwable tt) {
+		}
+	}
+
 }

src/lwjgl/java/net/lax1dude/eaglercraft/adapter/EaglerAdapterImpl2.java

@@ -81,8 +81,6 @@ import net.lax1dude.eaglercraft.RelayQuery.VersionMismatch;
 import net.lax1dude.eaglercraft.RelayWorldsQuery;
 import net.lax1dude.eaglercraft.ServerQuery;
 import net.lax1dude.eaglercraft.Voice;
-import net.lax1dude.eaglercraft.adapter.EaglerAdapterImpl2.ProgramGL;
-import net.lax1dude.eaglercraft.adapter.EaglerAdapterImpl2.RateLimit;
 import net.lax1dude.eaglercraft.adapter.lwjgl.GameWindowListener;
 import net.lax1dude.eaglercraft.sp.relay.pkt.IPacket;
 import net.lax1dude.eaglercraft.sp.relay.pkt.IPacket07LocalWorlds.LocalWorld;
@@ -971,11 +969,15 @@ public class EaglerAdapterImpl2 {
 	public static final boolean shouldShutdown() {
 		return Display.isCloseRequested();
 	}
-	public static final void updateDisplay() {
+	public static final void updateDisplay(int fpsLimit, boolean vsync) {
+		if(vsync) {
+			Display.setVSyncEnabled(true);
+			Display.update();
+		}else {
+			Display.setVSyncEnabled(false);
+			Display.sync(fpsLimit);
 			Display.update();
 		}
-	public static final void setVSyncEnabled(boolean p1) {
-		Display.setVSyncEnabled(p1);
 	}
 	public static final void enableRepeatEvents(boolean b) {
 		Keyboard.enableRepeatEvents(b);
@@ -1005,17 +1007,14 @@ public class EaglerAdapterImpl2 {
 			e.printStackTrace();
 		}
 	}
-	public static final void syncDisplay(int performanceToFps) {
-		Display.sync(performanceToFps);
-	}
 
-	private static final Set<String> rateLimitedAddresses = new HashSet();
+	private static final Set<String> rateLimitedAddresses = new HashSet<>();
-	private static final Set<String> blockedAddresses = new HashSet();
+	private static final Set<String> blockedAddresses = new HashSet<>();
 	
 	private static WebSocketClient clientSocket = null;
 	private static final Object socketSync = new Object();
 	
-	private static LinkedList<byte[]> readPackets = new LinkedList();
+	private static LinkedList<byte[]> readPackets = new LinkedList<>();
 	
 	private static class EaglerSocketClient extends WebSocketClient {
 		
@@ -1465,7 +1464,7 @@ public class EaglerAdapterImpl2 {
 	public static final float getVoiceSpeakVolume() {
 		return volumeSpeak;
 	}
-	private static final Set<String> emptySet = new HashSet();
+	private static final Set<String> emptySet = new HashSet<>();
 	public static final Set<String> getVoiceListening() {
 		return emptySet;
 	}
@@ -1478,7 +1477,7 @@ public class EaglerAdapterImpl2 {
 	public static final Set<String> getVoiceMuted() {
 		return emptySet;
 	}
-	private static final List<String> emptyList = new ArrayList();
+	private static final List<String> emptyList = new ArrayList<>();
 	public static final List<String> getVoiceRecent() {
 		return emptyList;
 	}
@@ -1546,8 +1545,8 @@ public class EaglerAdapterImpl2 {
 	
 	private static class ServerQueryImpl extends WebSocketClient implements ServerQuery {
 		
-		private final LinkedList<QueryResponse> queryResponses = new LinkedList();
+		private final LinkedList<QueryResponse> queryResponses = new LinkedList<>();
-		private final LinkedList<byte[]> queryResponsesBytes = new LinkedList();
+		private final LinkedList<byte[]> queryResponsesBytes = new LinkedList<>();
 		private final String type;
 		private boolean open;
 		private boolean alive;

src/main/java/net/lax1dude/eaglercraft/EarlyLoadScreen.java

@@ -99,7 +99,8 @@ public class EarlyLoadScreen {
 		_wglDrawArrays(_wGL_TRIANGLES, 0, 6);
 		_wglDisableVertexAttribArray(0);
 		_wglFlush();
-		updateDisplay();
+		updateDisplay(0, false);
+		sleep(20);
 
 		_wglUseProgram(null);
 		_wglBindBuffer(_wGL_ARRAY_BUFFER, null);
@@ -156,7 +157,8 @@ public class EarlyLoadScreen {
 		_wglDrawArrays(_wGL_TRIANGLES, 0, 6);
 		_wglDisableVertexAttribArray(0);
 		_wglFlush();
-		updateDisplay();
+		updateDisplay(0, false);
+		sleep(20);
 
 		_wglUseProgram(null);
 		_wglBindBuffer(_wGL_ARRAY_BUFFER, null);

src/main/java/net/lax1dude/eaglercraft/glemu/EaglerAdapterGL30.java

@@ -1613,4 +1613,33 @@ public class EaglerAdapterGL30 extends EaglerAdapterImpl2 {
 		return ret;
 	}
 
+	public static boolean sync(int limitFramerate, long[] timerPtr) {
+		boolean limitFPS = limitFramerate > 0 && limitFramerate < 1000;
+		boolean blocked = false;
+		
+		if(limitFPS) {
+			if(timerPtr[0] == 0l) {
+				timerPtr[0] = steadyTimeMillis();
+			}else {
+				long millis = steadyTimeMillis();
+				long frameMillis = (1000l / limitFramerate);
+				long frameTime = millis - timerPtr[0];
+				if(frameTime > 2000l || frameTime < 0l) {
+					frameTime = frameMillis;
+					timerPtr[0] = millis;
+				}else {
+					timerPtr[0] += frameMillis;
+				}
+				if(frameTime >= 0l && frameTime < frameMillis) {
+					sleep((int)(frameMillis - frameTime));
+					blocked = true;
+				}
+			}
+		}else {
+			timerPtr[0] = 0l;
+		}
+		
+		return blocked;
+	}
+
 }

src/main/java/net/minecraft/client/Minecraft.java

@@ -243,6 +243,7 @@ public class Minecraft implements Runnable {
 	
 	public boolean lanState = false;
 	public boolean yeeState = false;
+	public boolean checkGLErrors = false;
 	
 	public Minecraft() {
 		this.tempDisplayHeight = 480;
@@ -404,7 +405,7 @@ public class Minecraft implements Runnable {
 			EaglerAdapter.glPopMatrix();
 
 			EaglerAdapter.glFlush();
-			EaglerAdapter.updateDisplay();
+			updateDisplay();
 			
 			long t = t1 + 17 + 17*i - EaglerAdapter.steadyTimeMillis();
 			if(t > 0) {
@@ -437,7 +438,7 @@ public class Minecraft implements Runnable {
 			EaglerAdapter.glPopMatrix();
 
 			EaglerAdapter.glFlush();
-			EaglerAdapter.updateDisplay();
+			updateDisplay();
 			
 			long t = t1 + 17 + 17*i - EaglerAdapter.steadyTimeMillis();
 			if(t > 0) {
@@ -468,7 +469,7 @@ public class Minecraft implements Runnable {
 			EaglerAdapter.glPopMatrix();
 
 			EaglerAdapter.glFlush();
-			EaglerAdapter.updateDisplay();
+			updateDisplay();
 			
 			long t = t1 + 17 + 17*i - EaglerAdapter.steadyTimeMillis();
 			if(t > 0) {
@@ -478,7 +479,7 @@ public class Minecraft implements Runnable {
 		
 		EaglerAdapter.glClear(EaglerAdapter.GL_COLOR_BUFFER_BIT | EaglerAdapter.GL_DEPTH_BUFFER_BIT);
 		EaglerAdapter.glFlush();
-		EaglerAdapter.updateDisplay();
+		updateDisplay();
 		
 		EaglerAdapter.sleep(100);
 		
@@ -521,7 +522,7 @@ public class Minecraft implements Runnable {
 		EaglerAdapter.glEnable(EaglerAdapter.GL_ALPHA_TEST);
 		EaglerAdapter.glAlphaFunc(EaglerAdapter.GL_GREATER, 0.1F);
 		EaglerAdapter.glFlush();
-		EaglerAdapter.updateDisplay();
+		updateDisplay();
 		EaglerAdapter.optimize();
 	}
 
@@ -603,6 +604,7 @@ public class Minecraft implements Runnable {
 	 * string.
 	 */
 	public void checkGLError(String par1Str) {
+		if(!checkGLErrors) return;
 		int var2;
 		
 
@@ -712,7 +714,7 @@ public class Minecraft implements Runnable {
 		EaglerAdapter.glEnable(EaglerAdapter.GL_TEXTURE_2D);
 
 		if (!EaglerAdapter.isKeyDown(65)) {
-			EaglerAdapter.updateDisplay();
+			updateDisplay();
 		}
 
 		if (this.thePlayer != null && this.thePlayer.isEntityInsideOpaqueBlock()) {
@@ -781,11 +783,6 @@ public class Minecraft implements Runnable {
 			chunkGeometryUpdates = 0;
 			secondTimer = EaglerAdapter.steadyTimeMillis();
 		}
-		this.mcProfiler.startSection("syncDisplay");
-
-		if (this.func_90020_K() > 0) {
-			EaglerAdapter.syncDisplay(EntityRenderer.performanceToFps(this.func_90020_K()));
-		}
 		
 		if(isGonnaTakeDatScreenShot) {
 			isGonnaTakeDatScreenShot = false;
@@ -1104,6 +1101,11 @@ public class Minecraft implements Runnable {
 		this.voiceOverlay.setResolution(var4, var5);
 	}
 	
+	public void updateDisplay() {
+		int i = this.func_90020_K();
+		EaglerAdapter.updateDisplay(i > 0 ? EntityRenderer.performanceToFps(i) : 0, false);
+	}
+	
 	private boolean wasPaused = false;
 
 	/**

src/main/java/net/minecraft/src/GuiConnecting.java

@@ -101,13 +101,13 @@ public class GuiConnecting extends GuiScreen {
 	private void showDisconnectScreen(String e) {
 		RateLimit l = EaglerAdapter.getRateLimitStatus();
 		if(l == RateLimit.NOW_LOCKED) {
-			this.mc.displayGuiScreen(new GuiDisconnected(this.field_98098_c, "disconnect.ipNowLocked", "disconnect.endOfStream", null));
+			this.mc.displayGuiScreen(new GuiDisconnected(this.field_98098_c, "disconnect.ipNowLocked", "disconnect.endOfStream"));
 		}else if(l == RateLimit.LOCKED) {
-			this.mc.displayGuiScreen(new GuiDisconnected(this.field_98098_c, "disconnect.ipLocked", "disconnect.endOfStream", null));
+			this.mc.displayGuiScreen(new GuiDisconnected(this.field_98098_c, "disconnect.ipLocked", "disconnect.endOfStream"));
 		}else if(l == RateLimit.BLOCKED) {
-			this.mc.displayGuiScreen(new GuiDisconnected(this.field_98098_c, "disconnect.ipBlocked", "disconnect.endOfStream", null));
+			this.mc.displayGuiScreen(new GuiDisconnected(this.field_98098_c, "disconnect.ipBlocked", "disconnect.endOfStream"));
 		}else if(l == RateLimit.FAILED_POSSIBLY_LOCKED) {
-			this.mc.displayGuiScreen(new GuiDisconnected(this.field_98098_c, "disconnect.ipFailedPossiblyLocked", "disconnect.endOfStream", null));
+			this.mc.displayGuiScreen(new GuiDisconnected(this.field_98098_c, "disconnect.ipFailedPossiblyLocked", "disconnect.endOfStream"));
 		}else {
 			this.mc.displayGuiScreen(new GuiDisconnected(this.field_98098_c, "connect.failed", "disconnect.genericReason", "could not connect to "+uri, e));
 		}

src/main/java/net/minecraft/src/LoadingScreenRenderer.java

@@ -137,7 +137,7 @@ public class LoadingScreenRenderer implements IProgressUpdate {
 
 				this.mc.fontRenderer.drawStringWithShadow(this.currentlyDisplayedText, (var5 - this.mc.fontRenderer.getStringWidth(this.currentlyDisplayedText)) / 2, var6 / 2 - 4 - 16, 16777215);
 				this.mc.fontRenderer.drawStringWithShadow(this.field_73727_a, (var5 - this.mc.fontRenderer.getStringWidth(this.field_73727_a)) / 2, var6 / 2 - 4 + 8, 16777215);
-				EaglerAdapter.updateDisplay();
+				this.mc.updateDisplay();
 			}
 		}
 	}

src/main/java/net/minecraft/src/NetClientHandler.java

@@ -119,20 +119,20 @@ public class NetClientHandler extends NetHandler {
 				RateLimit r = EaglerAdapter.getRateLimitStatus();
 				if(r != null) {
 					if(r == RateLimit.NOW_LOCKED) {
-						this.mc.displayGuiScreen(new GuiDisconnected(backToMenu(), "disconnect.ratelimit.ipNowLocked", "disconnect.endOfStream", null));
+						this.mc.displayGuiScreen(new GuiDisconnected(backToMenu(), "disconnect.ratelimit.ipNowLocked", "disconnect.endOfStream"));
 					}else if(r == RateLimit.LOCKED) {
-						this.mc.displayGuiScreen(new GuiDisconnected(backToMenu(), "disconnect.ratelimit.ipLocked", "disconnect.endOfStream", null));
+						this.mc.displayGuiScreen(new GuiDisconnected(backToMenu(), "disconnect.ratelimit.ipLocked", "disconnect.endOfStream"));
 					}else if(r == RateLimit.BLOCKED) {
-						this.mc.displayGuiScreen(new GuiDisconnected(backToMenu(), "disconnect.ratelimit.ipBlocked", "disconnect.endOfStream", null));
+						this.mc.displayGuiScreen(new GuiDisconnected(backToMenu(), "disconnect.ratelimit.ipBlocked", "disconnect.endOfStream"));
 					}else if(r == RateLimit.FAILED_POSSIBLY_LOCKED) {
-						this.mc.displayGuiScreen(new GuiDisconnected(backToMenu(), "disconnect.ratelimit.ipFailedPossiblyLocked", "disconnect.endOfStream", null));
+						this.mc.displayGuiScreen(new GuiDisconnected(backToMenu(), "disconnect.ratelimit.ipFailedPossiblyLocked", "disconnect.endOfStream"));
 					}else {
-						this.mc.displayGuiScreen(new GuiDisconnected(backToMenu(), "disconnect.disconnected", "RateLimit." + r.name(), null));
+						this.mc.displayGuiScreen(new GuiDisconnected(backToMenu(), "disconnect.disconnected", "RateLimit." + r.name()));
 					}
 				}else {
 					if(!(this.mc.currentScreen instanceof GuiDisconnected) && !(this.mc.currentScreen instanceof GuiScreenSingleplayerException) &&
 							!(this.mc.currentScreen instanceof GuiScreenSingleplayerLoading)) {
-						this.mc.stopServerAndDisplayGuiScreen(new GuiDisconnected(backToMenu(), "disconnect.disconnected", "disconnect.endOfStream", null));
+						this.mc.stopServerAndDisplayGuiScreen(new GuiDisconnected(backToMenu(), "disconnect.disconnected", "disconnect.endOfStream"));
 					}
 				}
 				this.disconnected = true;

src/teavm/java/net/lax1dude/eaglercraft/adapter/EaglerAdapterImpl2.java

@@ -32,6 +32,7 @@ import org.teavm.interop.AsyncCallback;
 import org.teavm.jso.JSBody;
 import org.teavm.jso.JSFunctor;
 import org.teavm.jso.JSObject;
+import org.teavm.jso.JSProperty;
 import org.teavm.jso.ajax.ReadyStateChangeHandler;
 import org.teavm.jso.ajax.XMLHttpRequest;
 import org.teavm.jso.browser.Storage;
@@ -39,6 +40,7 @@ import org.teavm.jso.browser.TimerHandler;
 import org.teavm.jso.browser.Window;
 import org.teavm.jso.canvas.CanvasRenderingContext2D;
 import org.teavm.jso.canvas.ImageData;
+import org.teavm.jso.core.JSString;
 import org.teavm.jso.dom.css.CSSStyleDeclaration;
 import org.teavm.jso.dom.events.ErrorEvent;
 import org.teavm.jso.dom.events.Event;
@@ -108,10 +110,12 @@ import net.lax1dude.eaglercraft.Voice;
 import net.lax1dude.eaglercraft.adapter.teavm.EaglercraftLANClient;
 import net.lax1dude.eaglercraft.adapter.teavm.EaglercraftLANServer;
 import net.lax1dude.eaglercraft.adapter.teavm.EaglercraftVoiceClient;
+import net.lax1dude.eaglercraft.adapter.teavm.MessageChannel;
 import net.lax1dude.eaglercraft.adapter.teavm.SelfDefence;
 import net.lax1dude.eaglercraft.adapter.teavm.WebGL2RenderingContext;
 import net.lax1dude.eaglercraft.adapter.teavm.WebGLQuery;
 import net.lax1dude.eaglercraft.adapter.teavm.WebGLVertexArray;
+import net.lax1dude.eaglercraft.glemu.EaglerAdapterGL30;
 import net.lax1dude.eaglercraft.sp.relay.pkt.IPacket;
 import net.lax1dude.eaglercraft.sp.relay.pkt.IPacket00Handshake;
 import net.lax1dude.eaglercraft.sp.relay.pkt.IPacket07LocalWorlds;
@@ -243,6 +247,13 @@ public class EaglerAdapterImpl2 {
 	private static String[] identifier = new String[0];
 	private static String integratedServerScript = "worker_bootstrap.js";
 	private static boolean anisotropicFilteringSupported = false;
+	private static boolean vsyncSupport = false;
+	private static int vsyncTimeout = -1;
+	private static boolean useDelayOnSwap = false;
+	private static MessageChannel immediateContinueChannel = null;
+	private static Runnable currentMsgChannelContinueHack = null;
+	
+	private static final EagsFileChooser fileChooser = initFileChooser();
 	
 	public static final String[] getIdentifier() {
 		return identifier;
@@ -395,6 +406,18 @@ public class EaglerAdapterImpl2 {
 		});
 		onBeforeCloseRegister();
 		
+		checkImmediateContinueSupport();
+		
+		vsyncTimeout = -1;
+		vsyncSupport = false;
+
+		try {
+			asyncRequestAnimationFrame();
+			vsyncSupport = true;
+		}catch(Throwable t) {
+			System.err.println("VSync is not supported on this browser!");
+		}
+		
 		initFileChooser();
 		
 		EarlyLoadScreen.paintScreen();
@@ -456,33 +479,54 @@ public class EaglerAdapterImpl2 {
 	@JSBody(params = { }, script = "return window.startVoiceClient();")
 	private static native EaglercraftVoiceClient startVoiceClient();
 
+	private static interface EagsFileChooser extends JSObject {
+
+		@JSProperty
+		HTMLElement getInputElement();
+
+		void openFileChooser(String ext, String mime);
+
+		@JSProperty
+		ArrayBuffer getGetFileChooserResult();
+
+		@JSProperty
+		void setGetFileChooserResult(ArrayBuffer val);
+
+		@JSProperty
+		String getGetFileChooserResultName();
+
+		@JSProperty
+		void setGetFileChooserResultName(String str);
+
+	}
+
 	@JSBody(params = { }, script = 
-			"window.eagsFileChooser = {\r\n" + 
+			"var ret = {\r\n" + 
 			"inputElement: null,\r\n" + 
 			"openFileChooser: function(ext, mime){\r\n" + 
-			"var el = window.eagsFileChooser.inputElement = document.createElement(\"input\");\r\n" + 
+			"var el = ret.inputElement = document.createElement(\"input\");\r\n" + 
 			"el.type = \"file\";\r\n" + 
 			"el.multiple = false;\r\n" + 
 			"el.addEventListener(\"change\", function(evt){\r\n" + 
-			"var f = window.eagsFileChooser.inputElement.files;\r\n" + 
+			"var f = ret.inputElement.files;\r\n" + 
 			"if(f.length == 0){\r\n" + 
-			"window.eagsFileChooser.getFileChooserResult = null;\r\n" + 
+			"ret.getFileChooserResult = null;\r\n" + 
 			"}else{\r\n" + 
-			"(async function(){\r\n" + 
+			"f[0].arrayBuffer().then(function(res) {\r\n" + 
-			"window.eagsFileChooser.getFileChooserResult = await f[0].arrayBuffer();\r\n" + 
+			"ret.getFileChooserResult = res;\r\n" + 
-			"window.eagsFileChooser.getFileChooserResultName = f[0].name;\r\n" + 
+			"ret.getFileChooserResultName = f[0].name;\r\n" + 
-			"})();\r\n" + 
+			"});\r\n" + 
 			"}\r\n" + 
 			"});\r\n" + 
-			"window.eagsFileChooser.getFileChooserResult = null;\r\n" + 
+			"ret.getFileChooserResult = null;\r\n" + 
-			"window.eagsFileChooser.getFileChooserResultName = null;\r\n" + 
+			"ret.getFileChooserResultName = null;\r\n" + 
 			"el.accept = \".\" + ext;\r\n" +
 			"el.click();\r\n" + 
 			"},\r\n" + 
 			"getFileChooserResult: null,\r\n" + 
 			"getFileChooserResultName: null\r\n" + 
-			"};")
+			"}; return ret;")
-	private static native void initFileChooser();
+	private static native EagsFileChooser initFileChooser();
 	
 	public static final void destroyContext() {
 		
@@ -1695,7 +1739,13 @@ public class EaglerAdapterImpl2 {
 	public static final boolean shouldShutdown() {
 		return false;
 	}
-	public static final void updateDisplay() {
+	public static final boolean isVSyncSupported() {
+		return vsyncSupport;
+	}
+	@JSBody(params = { "doc" }, script = "return (typeof doc.visibilityState !== \"string\") || (doc.visibilityState === \"visible\");")
+	private static native boolean getVisibilityState(JSObject doc);
+	private static final long[] syncTimer = new long[1];
+	public static final void updateDisplay(int fpsLimit, boolean vsync) {
 		double r = win.getDevicePixelRatio();
 		int w = parent.getClientWidth();
 		int h = parent.getClientHeight();
@@ -1713,7 +1763,172 @@ public class EaglerAdapterImpl2 {
 		webgl.blitFramebuffer(0, 0, backBufferWidth, backBufferHeight, 0, 0, w2, h2, COLOR_BUFFER_BIT, NEAREST);
 		webgl.bindFramebuffer(FRAMEBUFFER, backBuffer.obj);
 		resizeBackBuffer(w2, h2);
-		sleep(1);
+
+		if(getVisibilityState(win.getDocument())) {
+			if(vsyncSupport && vsync) {
+				syncTimer[0] = 0l;
+				asyncRequestAnimationFrame();
+			}else {
+				if(fpsLimit <= 0) {
+					syncTimer[0] = 0l;
+					swapDelayTeaVM();
+				}else {
+					if(!EaglerAdapterGL30.sync(fpsLimit, syncTimer)) {
+						swapDelayTeaVM();
+					}
+				}
+			}
+		}else {
+			syncTimer[0] = 0l;
+			sleep(50);
+		}
+	}
+	@Async
+	private static native void asyncRequestAnimationFrame();
+	private static void asyncRequestAnimationFrame(AsyncCallback<Void> cb) {
+		if(vsyncTimeout != -1) {
+			cb.error(new IllegalStateException("Already waiting for vsync!"));
+			return;
+		}
+		final boolean[] hasTimedOut = new boolean[] { false };
+		final int[] timeout = new int[] { -1 };
+		Window.requestAnimationFrame((d) -> {
+			if(!hasTimedOut[0]) {
+				hasTimedOut[0] = true;
+				if(vsyncTimeout != -1) {
+					if(vsyncTimeout == timeout[0]) {
+						try {
+							Window.clearTimeout(vsyncTimeout);
+						}catch(Throwable t) {
+						}
+						vsyncTimeout = -1;
+					}
+					cb.complete(null);
+				}
+			}
+		});
+		vsyncTimeout = timeout[0] = Window.setTimeout(() -> {
+			if(!hasTimedOut[0]) {
+				hasTimedOut[0] = true;
+				if(vsyncTimeout != -1) {
+					vsyncTimeout = -1;
+					cb.complete(null);
+				}
+			}
+		}, 50);
+	}
+	private static final void swapDelayTeaVM() {
+		if(!useDelayOnSwap && immediateContinueChannel != null) {
+			immediateContinueTeaVM0();
+		}else {
+			sleep(0);
+		}
+	}
+	public static final void immediateContinue() {
+		if(immediateContinueChannel != null) {
+			immediateContinueTeaVM0();
+		}else {
+			sleep(0);
+		}
+	}
+	private static final JSString emptyJSString = JSString.valueOf("");
+	@Async
+	private static native void immediateContinueTeaVM0();
+	private static void immediateContinueTeaVM0(final AsyncCallback<Void> cb) {
+		if(currentMsgChannelContinueHack != null) {
+			cb.error(new IllegalStateException("Main thread is already waiting for an immediate continue callback!"));
+			return;
+		}
+		currentMsgChannelContinueHack = () -> {
+			cb.complete(null);
+		};
+		try {
+			immediateContinueChannel.getPort2().postMessage(emptyJSString);
+		}catch(Throwable t) {
+			currentMsgChannelContinueHack = null;
+			System.err.println("Caught error posting immediate continue, using setTimeout instead");
+			Window.setTimeout(() -> cb.complete(null), 0);
+		}
+	}
+	private static final int IMMEDIATE_CONT_SUPPORTED = 0;
+	private static final int IMMEDIATE_CONT_FAILED_NOT_ASYNC = 1;
+	private static final int IMMEDIATE_CONT_FAILED_NOT_CONT = 2;
+	private static final int IMMEDIATE_CONT_FAILED_EXCEPTIONS = 3;
+	private static void checkImmediateContinueSupport() {
+		immediateContinueChannel = null;
+		int stat = checkImmediateContinueSupport0();
+		if(stat == IMMEDIATE_CONT_SUPPORTED) {
+			return;
+		}else if(stat == IMMEDIATE_CONT_FAILED_NOT_ASYNC) {
+			System.err.println("MessageChannel fast immediate continue hack is incompatible with this browser due to actually continuing immediately!");
+		}else if(stat == IMMEDIATE_CONT_FAILED_NOT_CONT) {
+			System.err.println("MessageChannel fast immediate continue hack is incompatible with this browser due to startup check failing!");
+		}else if(stat == IMMEDIATE_CONT_FAILED_EXCEPTIONS) {
+			System.err.println("MessageChannel fast immediate continue hack is incompatible with this browser due to exceptions!");
+		}
+		immediateContinueChannel = null;
+	}
+	private static int checkImmediateContinueSupport0() {
+		try {
+			if(!MessageChannel.supported()) {
+				return IMMEDIATE_CONT_SUPPORTED;
+			}
+			immediateContinueChannel = new MessageChannel();
+			immediateContinueChannel.getPort1().addEventListener("message", new EventListener<MessageEvent>() {
+				@Override
+				public void handleEvent(MessageEvent evt) {
+					Runnable toRun = currentMsgChannelContinueHack;
+					currentMsgChannelContinueHack = null;
+					if(toRun != null) {
+						toRun.run();
+					}
+				}
+			});
+			immediateContinueChannel.getPort1().start();
+			immediateContinueChannel.getPort2().start();
+			final boolean[] checkMe = new boolean[1];
+			checkMe[0] = false;
+			currentMsgChannelContinueHack = () -> {
+				checkMe[0] = true;
+			};
+			immediateContinueChannel.getPort2().postMessage(emptyJSString);
+			if(checkMe[0]) {
+				currentMsgChannelContinueHack = null;
+				if(immediateContinueChannel != null) {
+					safeShutdownChannel(immediateContinueChannel);
+				}
+				immediateContinueChannel = null;
+				return IMMEDIATE_CONT_FAILED_NOT_ASYNC;
+			}
+			sleep(10);
+			currentMsgChannelContinueHack = null;
+			if(!checkMe[0]) {
+				if(immediateContinueChannel != null) {
+					safeShutdownChannel(immediateContinueChannel);
+				}
+				immediateContinueChannel = null;
+				return IMMEDIATE_CONT_FAILED_NOT_CONT;
+			}else {
+				return IMMEDIATE_CONT_SUPPORTED;
+			}
+		}catch(Throwable t) {
+			currentMsgChannelContinueHack = null;
+			if(immediateContinueChannel != null) {
+				safeShutdownChannel(immediateContinueChannel);
+			}
+			immediateContinueChannel = null;
+			return IMMEDIATE_CONT_FAILED_EXCEPTIONS;
+		}
+	}
+	private static void safeShutdownChannel(MessageChannel chan) {
+		try {
+			chan.getPort1().close();
+		}catch(Throwable tt) {
+		}
+		try {
+			chan.getPort2().close();
+		}catch(Throwable tt) {
+		}
 	}
 	public static final void setupBackBuffer() {
 		backBuffer = _wglCreateFramebuffer();
@@ -1739,9 +1954,6 @@ public class EaglerAdapterImpl2 {
 	}
 	public static final float getContentScaling() {
 		 return (float)win.getDevicePixelRatio();
-	}
-	public static final void setVSyncEnabled(boolean p1) {
-		
 	}
 	public static final void enableRepeatEvents(boolean b) {
 		enableRepeatEvents = b;
@@ -1776,9 +1988,6 @@ public class EaglerAdapterImpl2 {
 	}
 	public static final void setDisplaySize(int x, int y) {
 		
-	}
-	public static final void syncDisplay(int performanceToFps) {
-		
 	}
 	
 	private static final DateFormat dateFormatSS = new SimpleDateFormat("yyyy-MM-dd_HH.mm.ss");
@@ -2001,11 +2210,13 @@ public class EaglerAdapterImpl2 {
 	@JSBody(params = { }, script = "window.onbeforeunload = function(){javaMethods.get('net.lax1dude.eaglercraft.adapter.EaglerAdapterImpl2.onWindowUnload()V').invoke();return false;};")
 	private static native void onBeforeCloseRegister();
 
-	@JSBody(params = { "ext", "mime" }, script = "window.eagsFileChooser.openFileChooser(ext, mime);")
+	public static final void openFileChooser(String ext, String mime) {
-	public static native void openFileChooser(String ext, String mime);
+		fileChooser.openFileChooser(ext, mime);
+	}
 	
-	@JSBody(params = { }, script = "return window.eagsFileChooser.getFileChooserResult != null;")
+	public static final boolean getFileChooserResultAvailable() {
-	public static final native boolean getFileChooserResultAvailable();
+		return fileChooser.getGetFileChooserResult() != null;
+	}
 	
 	public static final byte[] getFileChooserResult() {
 		ArrayBuffer b = getFileChooserResult0();
@@ -2022,11 +2233,15 @@ public class EaglerAdapterImpl2 {
 		getFileChooserResult0();
 	}
 
-	@JSBody(params = {  }, script = "var ret = window.eagsFileChooser.getFileChooserResult; window.eagsFileChooser.getFileChooserResult = null; return ret;")
+	private static final ArrayBuffer getFileChooserResult0() {
-	private static native ArrayBuffer getFileChooserResult0();
+		ArrayBuffer ret = fileChooser.getGetFileChooserResult();
+		fileChooser.setGetFileChooserResultName(null);
+		return ret;
+	}
 
-	@JSBody(params = { }, script = "var ret = window.eagsFileChooser.getFileChooserResultName; window.eagsFileChooser.getFileChooserResultName = null; return ret;")
+	public static final String getFileChooserResultName() {
-	public static native String getFileChooserResultName();
+		return fileChooser.getGetFileChooserResultName();
+	}
 
 	public static final void setListenerPos(float x, float y, float z, float vx, float vy, float vz, float pitch, float yaw) {
 		float var2 = MathHelper.cos(-yaw * 0.017453292F);

src/teavm/java/net/lax1dude/eaglercraft/adapter/teavm/MessageChannel.java

@@ -0,0 +1,36 @@
+package net.lax1dude.eaglercraft.adapter.teavm;
+
+import org.teavm.jso.JSBody;
+import org.teavm.jso.JSClass;
+import org.teavm.jso.JSObject;
+import org.teavm.jso.JSProperty;
+import org.teavm.jso.workers.MessagePort;
+
+/**
+ * Copyright (c) 2024 lax1dude. All Rights Reserved.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ * 
+ */
+@JSClass
+public class MessageChannel implements JSObject {
+
+	@JSBody(params = { }, script = "return (typeof MessageChannel !== \"undefined\");")
+	public static native boolean supported();
+
+	@JSProperty
+	public native MessagePort getPort1();
+
+	@JSProperty
+	public native MessagePort getPort2();
+
+}