Very experimental rendering subsystem changes

rendering/src/main/java/de/staropensource/engine/rendering/RenderingSubsystem.java

@@ -21,25 +21,30 @@ package de.staropensource.engine.rendering;
 
 import de.staropensource.engine.base.annotation.EngineSubsystem;
 import de.staropensource.engine.base.annotation.EventListener;
+import de.staropensource.engine.base.implementable.Event;
 import de.staropensource.engine.base.implementable.SubsystemClass;
 import de.staropensource.engine.base.implementable.helper.EventHelper;
 import de.staropensource.engine.base.logging.Logger;
-import de.staropensource.engine.base.type.EventPriority;
+import de.staropensource.engine.base.utility.misc.NumberUtil;
-import de.staropensource.engine.base.utility.Math;
 import de.staropensource.engine.base.utility.information.EngineInformation;
 import de.staropensource.engine.base.implementation.versioning.StarOpenSourceVersioningSystem;
 import de.staropensource.engine.base.event.InternalEngineShutdownEvent;
 import de.staropensource.engine.base.type.DependencyVector;
-import de.staropensource.engine.base.utility.Miscellaneous;
+import de.staropensource.engine.base.utility.misc.Miscellaneous;
 import de.staropensource.engine.rendering.event.InputEvent;
 import de.staropensource.engine.rendering.event.RenderingErrorEvent;
 import de.staropensource.engine.rendering.exception.NotOnMainThreadException;
+import de.staropensource.engine.rendering.renderer.Renderer;
 import de.staropensource.engine.rendering.type.Window;
+import de.staropensource.engine.rendering.type.window.RenderingPlatform;
 import de.staropensource.engine.rendering.type.window.VsyncMode;
 import lombok.Getter;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 import org.lwjgl.glfw.*;
 
+import java.util.ArrayList;
+import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.LinkedList;
 import java.util.concurrent.atomic.AtomicReference;
@@ -117,8 +122,13 @@ public final class RenderingSubsystem extends SubsystemClass {
 
         // Precompute event listeners
         cacheEvents();
+
+        // Initialize GLFW
         initGlfw();
 
+        // Initialize renderer
+        Renderer.initialize();
+
         // Warn about subsystem and API instability
         Logger.warn("The rendering subsystem is experimental. Subsystem and API stability are not guaranteed.");
     }
@@ -150,10 +160,10 @@ public final class RenderingSubsystem extends SubsystemClass {
             Logger.diag("Setting initialization hints");
             switch (RenderingSubsystemConfiguration.getInstance().getInitialPlatform()) {
                 case ANY -> glfwInitHint(GLFW_PLATFORM, GLFW_ANY_PLATFORM);
-                case WAYLAND -> tryPlatform(GLFW_PLATFORM_WAYLAND);
+                case WAYLAND -> tryPlatform(GLFW_PLATFORM_WAYLAND, RenderingPlatform.WAYLAND);
-                case X11 -> tryPlatform(GLFW_PLATFORM_X11);
+                case X11 -> tryPlatform(GLFW_PLATFORM_X11, RenderingPlatform.X11);
-                case WIN32 -> tryPlatform(GLFW_PLATFORM_WIN32);
+                case WIN32 -> tryPlatform(GLFW_PLATFORM_WIN32, RenderingPlatform.WIN32);
-                case COCOA -> tryPlatform(GLFW_PLATFORM_COCOA);
+                case COCOA -> tryPlatform(GLFW_PLATFORM_COCOA, RenderingPlatform.COCOA);
                 case NONE -> glfwInitHint(GLFW_PLATFORM, GLFW_PLATFORM_NULL);
             }
             glfwInitHint(GLFW_WAYLAND_LIBDECOR, RenderingSubsystemConfiguration.getInstance().isInitialDisableLibdecor() ? GLFW_WAYLAND_DISABLE_LIBDECOR : GLFW_WAYLAND_PREFER_LIBDECOR);
@@ -182,7 +192,7 @@ public final class RenderingSubsystem extends SubsystemClass {
 
         long shutdownTime = Miscellaneous.measureExecutionTime(() -> {
             // Close all windows
-            for (Window window : Window.getWindows())
+            for (Window window : new ArrayList<>(Window.getWindows()))
                 window.close();
 
             instance.errorCallback.free();
@@ -198,7 +208,7 @@ public final class RenderingSubsystem extends SubsystemClass {
      * @see RenderingSubsystemConfiguration#errorRenderingFailures
      * @since v1-alpha9
      */
-    @EventListener(event = RenderingErrorEvent.class, priority = EventPriority.EXCLUSIVELY_IMPORTANT)
+    @EventListener(event = RenderingErrorEvent.class, priority = Event.Priority.EXCLUSIVELY_IMPORTANT)
     private static void logRenderingError(@NotNull String error) {
         Logger.error("Rendering error occurred: " + error);
     }
@@ -220,6 +230,9 @@ public final class RenderingSubsystem extends SubsystemClass {
 
         LinkedHashMap<@NotNull Window, @NotNull Throwable> throwables = new LinkedHashMap<>();
 
+        // Poll for events
+        glfwPollEvents();
+
         // Update and render all windows
         for (Window window : Window.getWindows()) {
             if (!window.isRendering())
@@ -232,14 +245,14 @@ public final class RenderingSubsystem extends SubsystemClass {
                 Logger.error("Rendering window " + window + " failed: Threw throwable " + throwable.getClass().getName() + (throwable.getMessage() == null ? "" : ": " + throwable.getMessage()));
                 throwables.put(window, throwable);
             }
-        }
 
-        // Poll for events
+            //bgfx_frame(false);
-        glfwPollEvents();
+        }
 
         return throwables;
     }
     /**
+     *
      * Renders all windows continuously.
      * To render all windows just once, invoke
      * {@link #renderWindows()} instead.
@@ -270,6 +283,8 @@ public final class RenderingSubsystem extends SubsystemClass {
         if (!RenderingSubsystemConfiguration.getInstance().isDebugFrames())
             reportDuration = Long.MAX_VALUE;
 
+        Logger.info("Entering render loop");
+
         // Run while the 'output' is empty
         while (output.get().isEmpty()) {
             renderTime = Miscellaneous.measureExecutionTime(() -> {
@@ -293,11 +308,33 @@ public final class RenderingSubsystem extends SubsystemClass {
                     Thread.onSpinWait();
             }
 
+
             // Calculate delta time and frame count every second
             if (System.currentTimeMillis() >= reportDuration) {
-                deltaTime = Math.getMeanLong(splitDeltaTime);                                          // Calculate delta time
+                deltaTime = NumberUtil.calculateMeanLong(splitDeltaTime);                                          // Calculate delta time
                 Logger.diag("Delta time average: " + deltaTime + " | Frames/s: " + 1000 / deltaTime);  // Print delta time and frame count to console
 
+                if (RenderingSubsystemConfiguration.getInstance().isDebugWindowStates())
+                    for (Window window : Window.getWindows())
+                        Logger.diag(
+                                "Window state for " + window.getUniqueIdentifier() + "\n" +
+                                "-> Terminated: " + window.isTerminated() + "\n" +
+                                "-> Name: " + window.getName() + "\n" +
+                                "-> Title: " + window.getTitle() + "\n" +
+                                "-> Size: " + window.getSize() + "\n" +
+                                "   -> Minimum: " + window.getMinimumSize() + "\n" +
+                                "   -> Maximum: " + window.getMaximumSize() + "\n" +
+                                "-> Position: " + window.getPosition() + "\n" +
+                                "-> Mode: " + window.getMode() + "\n" +
+                                "-> Monitor: " + window.getMonitor() + "\n" +
+                                "-> Resizable: " + window.isResizable() + "\n" +
+                                "-> Borderless: " + window.isBorderless() + "\n" +
+                                "-> Focusable: " + window.isFocusable() + "\n" +
+                                "-> On top: " + window.isOnTop() + "\n" +
+                                "-> Transparent: " + window.isTransparent() + "\n" +
+                                "-> Rendering: " + window.isRendering()
+                        );
+
                 reportDuration = System.currentTimeMillis() + 1000;                                    // Update 'reportDuration'
                 splitDeltaTime.clear();                                                                // Clear 'splitDeltaTime' list
             }
@@ -312,12 +349,21 @@ public final class RenderingSubsystem extends SubsystemClass {
      * and if so, specifies it as the platform to use.
      *
      * @param platform platform to try
+     * @param renderingPlatform {@link RenderingPlatform} used to log that the platform is unsupported (set to {@code null} to disable)
      * @since v1-alpha9
      */
-    private void tryPlatform(int platform) {
+    private void tryPlatform(int platform, @Nullable RenderingPlatform renderingPlatform) {
         if (glfwPlatformSupported(platform))
-            glfwInitHint(GLFW_PLATFORM, platform);
+            if (platform != GLFW_PLATFORM_WAYLAND)
-        else
+                glfwInitHint(GLFW_PLATFORM, platform);
+            else {
+                Logger.warn("Wayland is not supported by the StarOpenSource Engine due to various issues with it, sorry.");
+                tryPlatform(GLFW_PLATFORM_X11, RenderingPlatform.X11);
+            }
+        else {
+            if (renderingPlatform != null)
+                Logger.warn("Platform RenderingPlatform." + renderingPlatform.name() + " is not supported GLFW. Using RenderingPlatform.ANY instead");
             glfwInitHint(GLFW_PLATFORM, GLFW_ANY_PLATFORM);
+        }
     }
 }

rendering/src/main/java/de/staropensource/engine/rendering/RenderingSubsystemConfiguration.java

@@ -23,6 +23,7 @@ import de.staropensource.engine.base.implementable.Configuration;
 import de.staropensource.engine.base.logging.Logger;
 import de.staropensource.engine.base.utility.PropertiesReader;
 import de.staropensource.engine.rendering.event.RenderingErrorEvent;
+import de.staropensource.engine.rendering.type.window.RenderingAdapter;
 import de.staropensource.engine.rendering.type.window.RenderingPlatform;
 import de.staropensource.engine.rendering.type.window.VsyncMode;
 import lombok.Getter;
@@ -97,24 +98,48 @@ public final class RenderingSubsystemConfiguration extends Configuration {
      * Contains whether or not the delta time and
      * FPS count should be logged to the console
      * every second.
-     * <p>
-     * Changes will no longer be picked up as
-     * soon as the rendering loop is running.
      *
      * @since v1-alpha9
      * -- GETTER --
      * Returns whether or not the delta time and
      * FPS count should be logged to the console
      * every second.
-     * <p>
-     * Changes will no longer be picked up as
-     * soon as the rendering loop is running.
      *
      * @return print delta time and FPS count?
      * @since v1-alpha9
      */
     private boolean debugFrames;
 
+    /**
+     * Contains if to log the state of all
+     * windows every second.
+     *
+     * @since v1-alpha9
+     * -- GETTER --
+     * Returns if to log the state of all
+     * windows every second.
+     *
+     * @return log states of all windows?
+     * @since v1-alpha9
+     */
+    private boolean debugWindowStates;
+
+    /**
+     * Contains if to allow updates to a window's
+     * position. May cause errors and crashes to
+     * appear, we do not know why.
+     *
+     * @since v1-alpha9
+     * -- GETTER --
+     * Returns if to allow updates to a window's
+     * position. May cause errors and crashes to
+     * appear, we do not know why.
+     *
+     * @return allow window position updates?
+     * @since v1-alpha9
+     */
+    private boolean debugAllowPositionUpdates;
+
 
     /**
      * Contains the platform GLFW shall try initialising.
@@ -172,6 +197,18 @@ public final class RenderingSubsystemConfiguration extends Configuration {
     private boolean errorRenderingFailures;
 
 
+    /**
+     * Contains the adapter bgfx shall use.
+     *
+     * @since v1-alpha9
+     * -- GETTER --
+     * Returns the adapter bgfx shall use.
+     *
+     * @return bgfx adapter
+     * @since v1-alpha9
+     */
+    private RenderingAdapter renderingAdapter;
+
     /**
      * Contains which {@link VsyncMode} to use.
      * <p>
@@ -241,18 +278,27 @@ public final class RenderingSubsystemConfiguration extends Configuration {
             case "debug" -> debug = parser.getBoolean(group + property);
             case "debugInput" -> debugInput = parser.getBoolean(group + property);
             case "debugFrames" -> debugFrames = parser.getBoolean(group + property);
+            case "debugWindowStates" -> debugWindowStates = parser.getBoolean(group + property);
+            case "debugAllowPositionUpdates" -> debugAllowPositionUpdates = parser.getBoolean(group + property);
 
             case "initialPlatform" -> {
                 try {
                     initialPlatform = RenderingPlatform.valueOf(parser.getString(group + property).toUpperCase());
                 } catch (IllegalArgumentException ignored) {
-                    Logger.error("Platform " + parser.getString(group + property) + " is not valid");
+                    Logger.error("Rendering platform " + parser.getString(group + property) + " is not valid");
                 }
             }
             case "initialDisableLibdecor" -> initialDisableLibdecor = parser.getBoolean(group + property);
 
             case "errorRenderingFailures" -> errorRenderingFailures = parser.getBoolean(group + property);
 
+            case "renderingAdapter" -> {
+                try {
+                    renderingAdapter = RenderingAdapter.valueOf(parser.getString(group + property).toUpperCase());
+                } catch (IllegalArgumentException exception) {
+                    Logger.error("Rendering adapter " + parser.getString(group + property) + " is not valid");
+                }
+            }
             case "vsyncMode" -> {
                 try {
                     vsyncMode = VsyncMode.valueOf(parser.getString(group + property).toUpperCase());
@@ -271,21 +317,26 @@ public final class RenderingSubsystemConfiguration extends Configuration {
         if (!debug) {
             debugInput = false;
             debugFrames = false;
+            debugWindowStates = false;
+            debugAllowPositionUpdates = false;
         }
     }
 
     /** {@inheritDoc} */
     @Override
     public void loadDefaultConfiguration() {
-        debug = false;
+        debug = true;
         debugInput = false;
-        debugFrames = false;
+        debugFrames = true;
+        debugWindowStates = true;
+        debugAllowPositionUpdates = true;
 
         initialPlatform = RenderingPlatform.ANY;
         initialDisableLibdecor = false;
 
         errorRenderingFailures = true;
 
+        renderingAdapter = RenderingAdapter.ANY;
         vsyncMode = VsyncMode.ON;
         maximumFramesPerSecond = 60;
     }
@@ -297,12 +348,15 @@ public final class RenderingSubsystemConfiguration extends Configuration {
             case "debug" -> { return debug; }
             case "debugInput" -> { return debugInput; }
             case "debugFrames" -> { return debugFrames; }
+            case "debugWindowStates" -> { return debugWindowStates; }
+            case "debugAllowPositionUpdates" -> { return debugAllowPositionUpdates; }
 
             case "initialPlatform" -> { return initialPlatform; }
             case "disableLibdecor" -> { return initialDisableLibdecor; }
 
             case "errorRenderingFailures" -> { return errorRenderingFailures; }
 
+            case "renderingAdapter" -> { return renderingAdapter; }
             case "vsyncMode" -> { return vsyncMode; }
             case "maximumFramesPerSecond" -> { return maximumFramesPerSecond; }
             default -> { return null; }

rendering/src/main/java/de/staropensource/engine/rendering/callback/KeyCallback.java

@@ -21,7 +21,6 @@ package de.staropensource.engine.rendering.callback;
 
 import de.staropensource.engine.rendering.type.Window;
 import de.staropensource.engine.rendering.event.InputEvent;
-import de.staropensource.engine.rendering.callback.WindowCallback;
 import de.staropensource.engine.rendering.type.input.Key;
 import de.staropensource.engine.rendering.type.input.KeyState;
 import org.jetbrains.annotations.NotNull;

rendering/src/main/java/de/staropensource/engine/rendering/event/RenderingThreadThrowableEvent.java

@@ -0,0 +1,58 @@
+/*
+ * STAROPENSOURCE ENGINE SOURCE FILE
+ * Copyright (c) 2024 The StarOpenSource Engine Authors
+ * Licensed under the GNU Affero General Public License v3
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.staropensource.engine.rendering.event;
+
+import de.staropensource.engine.base.implementable.Event;
+import de.staropensource.engine.base.implementable.helper.EventHelper;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Emitted when the rendering thread exits due to an unhandled exception.
+ *
+ * @since v1-alpha9
+ */
+public final class RenderingThreadThrowableEvent implements Event {
+    /**
+     * Creates and initializes an instance of this event.
+     *
+     * @since v1-alpha9
+     */
+    public RenderingThreadThrowableEvent() {}
+
+    /**
+     * {@inheritDoc}
+     *
+     * @deprecated use the {@code callEvent} method with arguments
+     * @see #callEvent(Throwable)
+     */
+    @Deprecated
+    @Override
+    public void callEvent() {}
+
+    /**
+     * Emits the event and calls all event listeners.
+     *
+     * @param throwable thrown {@link Throwable}
+     * @since v1-alpha9
+     */
+    public void callEvent(@NotNull Throwable throwable) {
+        EventHelper.invokeAnnotatedMethods(getClass(), throwable);
+    }
+}

rendering/src/main/java/de/staropensource/engine/rendering/renderer/Renderer.java

@@ -0,0 +1,379 @@
+/*
+ * STAROPENSOURCE ENGINE SOURCE FILE
+ * Copyright (c) 2024 The StarOpenSource Engine Authors
+ * Licensed under the GNU Affero General Public License v3
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.staropensource.engine.rendering.renderer;
+
+import de.staropensource.engine.base.logging.Logger;
+import de.staropensource.engine.base.utility.misc.Miscellaneous;
+import de.staropensource.engine.base.utility.misc.NumberUtil;
+import de.staropensource.engine.rendering.RenderingSubsystemConfiguration;
+import de.staropensource.engine.rendering.exception.NotOnMainThreadException;
+import de.staropensource.engine.rendering.type.FrameHandler;
+import de.staropensource.engine.rendering.type.Monitor;
+import de.staropensource.engine.rendering.type.Window;
+import de.staropensource.engine.rendering.type.window.VsyncMode;
+import lombok.Getter;
+import org.jetbrains.annotations.NotNull;
+
+import java.time.LocalTime;
+import java.util.*;
+
+import static org.lwjgl.bgfx.BGFX.*;
+import static org.lwjgl.glfw.GLFW.*;
+
+/**
+ * Renders all windows out.
+ *
+ * @since v1-alpha9
+ */
+@SuppressWarnings({ "JavadocDeclaration" })
+public final class Renderer {
+    /**
+     * Contains all frame handlers.
+     * <p>
+     * Frame handlers are invoked before
+     * all windows are rendered, allowing
+     * the application or game to respond
+     * to frame renders.
+     *
+     * @since v1-alpha9
+     */
+    private static final @NotNull List<@NotNull FrameHandler> frameHandlers = Collections.synchronizedList(new ArrayList<>());
+
+    /**
+     * Contains if the renderer has been initialized.
+     *
+     * @since v1-alpha9
+     * -- GETTER --
+     * Returns if the renderer has been initialized.
+     *
+     * @return renderer initialized?
+     * @since v1-alpha9
+     */
+    @Getter
+    private static boolean initialized = false;
+
+    /**
+     * Contains if the renderer is running.
+     *
+     * @since v1-alpha9
+     * -- GETTER --
+     * Returns if the renderer is running.
+     *
+     * @return renderer running?
+     * @since v1-alpha9
+     */
+    @Getter
+    private static boolean running = false;
+
+    /**
+     * Contains the frame count aka.
+     * the amount of frames rendered.
+     * <p>
+     * Updated every frame.
+     *
+     * @since v1-alpha9
+     * -- GETTER --
+     * Returns the frame count aka.
+     * the amount of frames rendered.
+     * <p>
+     * Updated every frame.
+     *
+     * @return amount of frames rendered
+     * @since v1-alpha9
+     */
+    @Getter
+    private static long frameCount = 0L;
+
+    /**
+     * Contains the delta time, also
+     * known as the render time.
+     * <p>
+     * Updated every second.
+     *
+     * @since v1-alpha9
+     * -- GETTER --
+     * Returns the delta time, also
+     * known as the render time.
+     * <p>
+     * Updated every second.
+     *
+     * @return delta time
+     * @since v1-alpha9
+     */
+    @Getter
+    private static double deltaTime = 0d;
+
+    /**
+     * Contains the frames per second (FPS) count.
+     * <p>
+     * Updated every second.
+     *
+     * @since v1-alpha9
+     * -- GETTER --
+     * Returns the frames per second (FPS) count.
+     * <p>
+     * Updated every second.
+     *
+     * @return frames per second
+     * @since v1-alpha9
+     */
+    @Getter
+    private static double framesPerSecond = 0d;
+
+    /**
+     * Contains the time it took
+     * to calculate the last frame.
+     * <p>
+     * Updated every frame.
+     *
+     * @since v1-alpha9
+     * -- GETTER --
+     * Contains the time it took
+     * to calculate the last frame.
+     * <p>
+     * Updated every frame.
+     *
+     * @return last frame time
+     * @since v1-alpha9
+     */
+    @Getter
+    private static Map<@NotNull String, @NotNull Long> lastFrameTime = Collections.unmodifiableMap(new HashMap<>());
+
+
+    // ----> Initialization
+    /**
+     * Initializes the renderer.
+     *
+     * @since v1-alpha9
+     */
+    public static void initialize() {
+        if (initialized)
+            return;
+
+        addFrameHandler(new FrameHandler() {
+            @Override
+            public @NotNull FrameHandler.Priority getPriority() {
+                return Priority.VERY_IMPORTANT;
+            }
+
+            @Override
+            public void run() {
+                bgfx_set_view_clear(0, BGFX_CLEAR_COLOR | BGFX_CLEAR_DEPTH, 0x000000, 1.0f, 0);
+            }
+        });
+        addFrameHandler(new FrameHandler() {
+            /** {@inheritDoc} */
+            @Override
+            public @NotNull FrameHandler.Priority getPriority() {
+                return Priority.VERY_UNIMPORTANT;
+            }
+
+            /** {@inheritDoc} */
+            @Override
+            public void run() {
+                int offset = 2;
+
+                bgfx_dbg_text_clear(0, false);
+                bgfx_dbg_text_printf(0, 0, 0x0f, "It's " + NumberUtil.padNumbers(LocalTime.now().getHour(), 2) + ":" + NumberUtil.padNumbers(LocalTime.now().getMinute(), 2) + ":" + NumberUtil.padNumbers(LocalTime.now().getSecond(), 2));
+                bgfx_dbg_text_printf(0, 1, 0x0f, "LFT.size(): " + lastFrameTime.size());
+                for (String item : lastFrameTime.keySet()) {
+                    bgfx_dbg_text_printf(0, offset, 0x0f, item + ": " + lastFrameTime.get(item) + "ms");
+                    offset += 1;
+                }
+            }
+        });
+
+        initialized = true;
+    }
+
+
+    // -----> Frame handler management
+    /**
+     * Adds the specified frame handler.
+     *
+     * @param frameHandler {@link FrameHandler} to add
+     * @since v1-alpha9
+     */
+    public static void addFrameHandler(@NotNull FrameHandler frameHandler) {
+        frameHandlers.add(frameHandler);
+        frameHandlers.sort(Comparator.comparing(FrameHandler::getPriority));
+    }
+
+    /**
+     * Removes the specified frame handler.
+     *
+     * @param frameHandler {@link FrameHandler} to remove
+     * @since v1-alpha9
+     */
+    public static void removeFrameHandler(@NotNull FrameHandler frameHandler) {
+        frameHandlers.remove(frameHandler);
+    }
+
+
+    // -----> Rendering logic
+    /**
+     * Starts the renderer.
+     *
+     * @throws NotOnMainThreadException if not running on the main thread
+     * @throws RuntimeException         on major rendering error
+     * @since v1-alpha9
+     */
+    public static void start() throws RuntimeException {
+        // Check if running on main thread
+        if (!Miscellaneous.onMainThread())
+            throw new NotOnMainThreadException();
+
+        String threadName = Thread.currentThread().getName();
+        int threadPriority = Thread.currentThread().getPriority();
+        RuntimeException exception = null;
+
+        // Update thread
+        Thread.currentThread().setName("Rendering thread");
+        Thread.currentThread().setPriority(Thread.MAX_PRIORITY);
+
+        // Start renderer
+        running = true;
+        try {
+            render();
+        } catch (Throwable throwable) {
+            exception = new RuntimeException("Renderer failed", throwable);
+        }
+
+        // Revert thread changes
+        Thread.currentThread().setName(threadName);
+        Thread.currentThread().setPriority(threadPriority);
+
+        // Throw if necessary
+        if (exception != null)
+            throw exception;
+    }
+
+    /**
+     * Renders all windows.
+     *
+     * @since v1-alpha9
+     */
+    @SuppressWarnings({ "InfiniteLoopStatement" })
+    private static void render() throws Throwable {
+        long previousFrameCount = 0L;                                         // Frame count one second ago
+        LinkedList<Long> deltaTimeFractions = new LinkedList<>();             // Contains all delta time fractions
+        Map<String, Long> execTimes = new LinkedHashMap<>();                  // Contains the amount of time of all rendering operations
+        long timesWait;                                                       // Time to wait until the next frame
+        long timesPSO = System.currentTimeMillis() + 1000;                    // Time to wait until invoking per-second operations
+
+        while (true) {
+            // Invoke frame handlers
+            for (FrameHandler frameHandler : frameHandlers)
+                execTimes.put("Frame handler '" + frameHandler.getClass().getName() + "'", Miscellaneous.measureExecutionTime(frameHandler::run));
+
+
+            // Perform rendering
+            execTimes.put("Rendering", Miscellaneous.measureExecutionTime(() -> {
+                // Poll for events
+                glfwPollEvents();
+
+                // Reset backbuffer
+                bgfx_reset(Window.getWindows().getFirst().getSize().getX(), Window.getWindows().getFirst().getSize().getY(), RenderingSubsystemConfiguration.getInstance().getVsyncMode() == VsyncMode.ON ? BGFX_RESET_VSYNC : BGFX_RESET_NONE, BGFX_TEXTURE_FORMAT_RGBA4);
+
+                // Render all windows
+                for (Window window : Window.getWindows())
+                    if (window.isRendering()) {
+                        window.updateState();
+                        window.render();
+                    }
+
+                // Advance to next frame
+                bgfx_frame(false);
+            }));
+
+
+            // Determine time to wait for the next frame
+            execTimes.put("Waiting", 0L);
+            switch (RenderingSubsystemConfiguration.getInstance().getVsyncMode()) {
+                case OFF -> execTimes.replace("Waiting", (long) (1d / RenderingSubsystemConfiguration.getInstance().getMaximumFramesPerSecond() * 1000d));
+                case ON -> {
+                    for (Monitor monitor : Monitor.getMonitors())
+                        if (monitor.getRefreshRate() > execTimes.get("Waiting"))
+                            execTimes.replace("Waiting", (long) monitor.getRefreshRate());
+                }
+                default -> {}
+            }
+            for (String time : execTimes.keySet())
+                if (!time.equals("Waiting"))
+                    execTimes.replace("Waiting", execTimes.get("Waiting") - execTimes.get(time));
+
+            // Wait until next frame
+            if (execTimes.get("Waiting") > 0) {
+                timesWait = execTimes.get("Waiting") + System.currentTimeMillis();
+
+                while (System.currentTimeMillis() < timesWait)
+                    Thread.onSpinWait();
+            }
+
+
+            // Perform per-frame operations
+            frameCount += 1;
+            lastFrameTime = new HashMap<>(execTimes);
+            deltaTimeFractions.add(execTimes.get("Rendering") + execTimes.get("Waiting"));
+            execTimes.clear();
+
+
+            // Perform per-second operations
+            if (System.currentTimeMillis() >= timesPSO) {
+                // Calculate delta time and FPS count
+                deltaTime = NumberUtil.calculateMeanLong(deltaTimeFractions);
+                framesPerSecond = 1000 / deltaTime;
+
+                // Log frame count
+                if (RenderingSubsystemConfiguration.getInstance().isDebugFrames())
+                    Logger.diag("Frames " + previousFrameCount + "-" + frameCount + "\n-> Frames/s: " + framesPerSecond + "\n-> Delta time: " + deltaTime);
+
+                // Log window states
+                if (RenderingSubsystemConfiguration.getInstance().isDebugWindowStates())
+                    for (Window window : Window.getWindows())
+                        Logger.diag(
+                                "Window state for " + window.getUniqueIdentifier() + "\n" +
+                                        "-> Terminated: " + window.isTerminated() + "\n" +
+                                        "-> Name: " + window.getName() + "\n" +
+                                        "-> Title: " + window.getTitle() + "\n" +
+                                        "-> Size: " + window.getSize() + "\n" +
+                                        "   -> Minimum: " + window.getMinimumSize() + "\n" +
+                                        "   -> Maximum: " + window.getMaximumSize() + "\n" +
+                                        "-> Position: " + window.getPosition() + "\n" +
+                                        "-> Mode: " + window.getMode() + "\n" +
+                                        "-> Monitor: " + window.getMonitor() + "\n" +
+                                        "-> Resizable: " + window.isResizable() + "\n" +
+                                        "-> Borderless: " + window.isBorderless() + "\n" +
+                                        "-> Focusable: " + window.isFocusable() + "\n" +
+                                        "-> On top: " + window.isOnTop() + "\n" +
+                                        "-> Transparent: " + window.isTransparent() + "\n" +
+                                        "-> Rendering: " + window.isRendering()
+                        );
+
+
+
+                // Reset per-second variables
+                previousFrameCount = frameCount;
+                deltaTimeFractions.clear();
+                timesPSO = System.currentTimeMillis() + 1000;
+            }
+        }
+    }
+}

rendering/src/main/java/de/staropensource/engine/rendering/type/FrameHandler.java

@@ -0,0 +1,93 @@
+/*
+ * STAROPENSOURCE ENGINE SOURCE FILE
+ * Copyright (c) 2024 The StarOpenSource Engine Authors
+ * Licensed under the GNU Affero General Public License v3
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.staropensource.engine.rendering.type;
+
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Used for performing actions
+ * before a frame is rendered.
+ *
+ * @since v1-alpha9
+ */
+public interface FrameHandler {
+    /**
+     * Returns the priority this frame handler has.
+     *
+     * @return priority
+     * @since v1-alpha9
+     */
+    @NotNull FrameHandler.Priority getPriority();
+
+    /**
+     * Invokes this frame handler.
+     *
+     * @since v1-alpha9
+     */
+    void run();
+
+    /**
+     * Contains all priority levels
+     * a {@link FrameHandler} can have.
+     *
+     * @since v1-alpha9
+     */
+    enum Priority {
+        /**
+         * {@link FrameHandler}s with
+         * this priority are called first.
+         *
+         * @since v1-alpha9
+         */
+        VERY_IMPORTANT,
+
+        /**
+         * {@link FrameHandler}s with
+         * this priority are called 2nd.
+         *
+         * @since v1-alpha9
+         */
+        IMPORTANT,
+
+        /**
+         * {@link FrameHandler}s with
+         * this priority are called 3rd.
+         *
+         * @since v1-alpha9
+         */
+        DEFAULT,
+
+        /**
+         * {@link FrameHandler}s with
+         * this priority are called 4th.
+         *
+         * @since v1-alpha9
+         */
+        UNIMPORTANT,
+
+        /**
+         * {@link FrameHandler}s with
+         * this priority are called last.
+         *
+         * @since v1-alpha9
+         */
+        VERY_UNIMPORTANT,
+    }
+}

rendering/src/main/java/de/staropensource/engine/rendering/type/Window.java

@@ -22,19 +22,21 @@ package de.staropensource.engine.rendering.type;
 import de.staropensource.engine.base.logging.Logger;
 import de.staropensource.engine.base.type.Tristate;
 import de.staropensource.engine.base.type.vector.Vec2i;
-import de.staropensource.engine.base.utility.Miscellaneous;
+import de.staropensource.engine.base.utility.misc.Miscellaneous;
+import de.staropensource.engine.base.utility.misc.TypeConversion;
+import de.staropensource.engine.rendering.RenderingSubsystemConfiguration;
 import de.staropensource.engine.rendering.callback.KeyCallback;
 import de.staropensource.engine.rendering.callback.MouseButtonCallback;
 import de.staropensource.engine.rendering.event.InputEvent;
 import de.staropensource.engine.rendering.exception.NotOnMainThreadException;
 import de.staropensource.engine.rendering.exception.WindowCreationFailureException;
-import de.staropensource.engine.rendering.type.window.WindowMode;
 import lombok.AccessLevel;
 import lombok.Getter;
 import lombok.Setter;
 import org.jetbrains.annotations.ApiStatus;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
+import org.lwjgl.bgfx.BGFX;
 import org.lwjgl.bgfx.BGFXInit;
 import org.lwjgl.glfw.*;
 import org.lwjgl.stb.STBImage;
@@ -60,7 +62,7 @@ import static org.lwjgl.system.MemoryUtil.*;
  * @since v1-alpha9
  */
 @Getter
-@SuppressWarnings({ "JavadocDeclaration" })
+@SuppressWarnings({ "unused", "JavadocDeclaration" })
 public final class Window implements AutoCloseable {
     /**
      * A set of all active windows.
@@ -69,18 +71,7 @@ public final class Window implements AutoCloseable {
      */
     private static final @NotNull List<@NotNull Window> windows = new ArrayList<>();
 
-    /**
+    // -----> Internal fields
-     * Contains the internal window identifier.
-     *
-     * @since v1-alpha9
-     * -- GETTER --
-     * Returns the internal window identifier.
-     *
-     * @return window identifier
-     * @since v1-alpha9
-     */
-    private long identifier;
-
     /**
      * Contains if this window is fresh.
      * <p>
@@ -99,8 +90,39 @@ public final class Window implements AutoCloseable {
      * @return fresh flag state
      * @since v1-alpha9
      */
-    private boolean fresh = true;
+    @Getter(value = AccessLevel.NONE)
+    @Setter(value = AccessLevel.NONE)
+    private boolean fresh;
 
+    /**
+     * Contains the internal GLFW window identifier.
+     *
+     * @since v1-alpha9
+     * -- GETTER --
+     * Returns the internal GLFW window identifier.
+     *
+     * @return GLFW window identifier
+     * @since v1-alpha9
+     */
+    @Getter(value = AccessLevel.NONE)
+    @Setter(value = AccessLevel.NONE)
+    private long internalWindowIdentifier;
+
+    /**
+     * Contains the internal bgfx view identifier.
+     *
+     * @since v1-alpha9
+     * -- GETTER --
+     * Returns the internal bgfx view identifier.
+     *
+     * @return bgfx view identifier
+     * @since v1-alpha9
+     */
+    @Getter(value = AccessLevel.NONE)
+    @Setter(value = AccessLevel.NONE)
+    private int internalViewIdentifier;
+
+    // -----> Window properties
     /**
      * Contains if this window can be interacted with or not.
      *
@@ -258,7 +280,7 @@ public final class Window implements AutoCloseable {
     private @NotNull Vec2i position;
 
     /**
-     * Contains in which {@link WindowMode} this window is in.
+     * Contains in which {@link Mode} this window is in.
      *
      * @since v1-alpha9
      * -- GETTER --
@@ -267,7 +289,7 @@ public final class Window implements AutoCloseable {
      * @return window mode
      * @since v1-alpha9
      */
-    private @NotNull WindowMode windowMode;
+    private @NotNull Window.Mode mode;
 
     /**
      * Contains on which {@link Monitor} the window is displayed on.
@@ -287,24 +309,6 @@ public final class Window implements AutoCloseable {
     @Setter
     private @NotNull Monitor monitor;
 
-    /**
-     * Contains how fast the window may update it's contents.
-     *
-     * @since v1-alpha9
-     * -- GETTER --
-     * Returns how fast the window may update it's contents.
-     *
-     * @return new window frame limit
-     * @since v1-alpha9
-     * -- SETTER --
-     * Sets how fast the window may update it's contents.
-     *
-     * @param framerate new frame limit
-     * @since v1-alpha9
-     */
-    @Setter
-    private int framerate;
-
     /**
      * Contains if this window can be resized by the user.
      *
@@ -403,16 +407,20 @@ public final class Window implements AutoCloseable {
      */
     private GLFWMouseButtonCallback mouseButtonCallback;
 
+
+    // -----> Static methods
     /**
      * Returns a set of active windows.
      *
      * @return active windows
      * @since v1-alpha9
      */
-    public static @NotNull HashSet<@NotNull Window> getWindows() {
+    public static @NotNull List<@NotNull Window> getWindows() {
-        return new HashSet<>(windows);
+        return Collections.unmodifiableList(windows);
     }
 
+
+    // -----> Initialization
     /**
      * Creates and initializes an instance of this abstract class.
      *
@@ -423,7 +431,7 @@ public final class Window implements AutoCloseable {
      * @param minimumSize minimum size
      * @param maximumSize maximum size
      * @param position    position
-     * @param windowMode  window mode
+     * @param mode  window mode
      * @param monitor     monitor
      * @param resizable   resizable flag
      * @param borderless  borderless flag
@@ -441,7 +449,7 @@ public final class Window implements AutoCloseable {
                    @NotNull Vec2i minimumSize,
                    @NotNull Vec2i maximumSize,
                    @NotNull Vec2i position,
-                   @NotNull WindowMode windowMode,
+                   @NotNull Window.Mode mode,
                    @NotNull Monitor monitor,
                    boolean resizable,
                    boolean borderless,
@@ -450,7 +458,11 @@ public final class Window implements AutoCloseable {
                    boolean transparent,
                    boolean rendering) throws NotOnMainThreadException {
         // Initialize variables
+        this.fresh = true;
+        this.internalWindowIdentifier = 0L;
+        this.internalViewIdentifier = 0;
         this.uniqueIdentifier = UUID.randomUUID();
+        this.terminated = false;
         this.name = name;
         this.title = title;
         this.icons = icons;
@@ -458,7 +470,7 @@ public final class Window implements AutoCloseable {
         this.minimumSize = minimumSize;
         this.maximumSize = maximumSize;
         this.position = position;
-        this.windowMode = windowMode;
+        this.mode = mode;
         this.monitor = monitor;
         this.resizable = resizable;
         this.borderless = borderless;
@@ -468,25 +480,45 @@ public final class Window implements AutoCloseable {
         this.rendering = rendering;
 
         // Log about window creation
-        Logger.diag("Creating new window with properties: uniqueIdentifier=" + uniqueIdentifier + " name=\"" + name + "\" title=\"" + title + "\" icons=" + Arrays.toString(icons) + " size=" + size + " minimumSize=" + minimumSize + " maximumSize=" + maximumSize + " position=" + position + " windowMode=" + windowMode + " monitor=" + monitor.getUniqueIdentifier() + " (" + monitor.getName() + ") resizable=" + resizable + " borderless=" + borderless + " focusable=" + focusable + " onTop=" + onTop + " transparent=" + transparent + " rendering=" + rendering);
+        Logger.verb("Creating new window " + this.uniqueIdentifier + "\n" +
+                "-> Name: " + this.name + "\n" +
+                "-> Title: " + this.title + "\n" +
+                "-> Size: " + this.size + "\n" +
+                "   -> Minimum: " + this.minimumSize + "\n" +
+                "   -> Maximum: " + this.maximumSize + "\n" +
+                "-> Position: " + this.position + "\n" +
+                "-> Mode: " + this.mode + "\n" +
+                "-> Monitor: " + this.monitor + "\n" +
+                "-> Resizable: " + this.resizable + "\n" +
+                "-> Borderless: " + this.borderless + "\n" +
+                "-> Focusable: " + this.focusable + "\n" +
+                "-> On top: " + this.onTop + "\n" +
+                "-> Transparent: " + this.transparent + "\n" +
+                "-> Rendering: " + this.rendering
+        );
 
-        // Allow windowing API to initialize window
+        // Check if another window already exists
+        if (!Window.getWindows().isEmpty())
+            Logger.crash("Window already present\nThe StarOpenSource Engine is unable to initialize more than one window at the moment, sorry.");
+
+        // Initialize window
         initializeWindow();
 
         // Update state
         updateState();
 
+        // Initialize bgfx
+        if (glfwGetPlatform() != GLFW_PLATFORM_NULL)
+            initBgfx();
+
         // Add to window set
         windows.add(this);
         fresh = false;
     }
 
+
     /**
-     * Allows the windowing API to initialize the window.
+     * Initializes this window.
-     * <p>
-     * NEVER place any code in the constructor. Instead, write
-     * API-specific window initialization code in here
-     * or stuff may break unexpectedly.
      *
      * @throws NotOnMainThreadException if not running on the main thread
      * @since v1-alpha9
@@ -504,12 +536,13 @@ public final class Window implements AutoCloseable {
         }
 
         // Set window hints
-        glfwWindowHint(GLFW_VISIBLE, GLFW_FALSE);  // The window's visibility is later changed in setWindowState, this is just for setting up the window
+        if (RenderingSubsystemConfiguration.getInstance().isDebugAllowPositionUpdates()) {
-        glfwWindowHint(GLFW_POSITION_X, getPosition().getX());
+            glfwWindowHint(GLFW_POSITION_X, getPosition().getX());
-        glfwWindowHint(GLFW_POSITION_Y, getPosition().getY());
+            glfwWindowHint(GLFW_POSITION_Y, getPosition().getY());
+        }
         glfwWindowHint(GLFW_CENTER_CURSOR, 0);
-        glfwWindowHint(GLFW_FOCUSED, Miscellaneous.getIntegerizedBoolean(focused));
+        glfwWindowHint(GLFW_FOCUSED, TypeConversion.booleanToInteger(focused));
-        glfwWindowHint(GLFW_TRANSPARENT_FRAMEBUFFER, Miscellaneous.getIntegerizedBoolean(isTransparent()));
+        glfwWindowHint(GLFW_TRANSPARENT_FRAMEBUFFER, TypeConversion.booleanToInteger(transparent));
         glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API);
         glfwWindowHint(GLFW_COCOA_RETINA_FRAMEBUFFER, GLFW_FALSE);
         glfwWindowHintString(GLFW_WAYLAND_APP_ID, getName());
@@ -517,8 +550,8 @@ public final class Window implements AutoCloseable {
         glfwWindowHintString(GLFW_X11_INSTANCE_NAME, getName());
 
         // Create window
-        identifier = glfwCreateWindow(getSize().getX(), getSize().getY(), getTitle(), NULL, NULL);
+        internalWindowIdentifier = glfwCreateWindow(getSize().getX(), getSize().getY(), getTitle(), NULL, NULL);
-        if (identifier == NULL)
+        if (internalWindowIdentifier == NULL)
             throw new WindowCreationFailureException();
 
         // Own context
@@ -532,18 +565,15 @@ public final class Window implements AutoCloseable {
         mouseButtonCallback = GLFWMouseButtonCallback.create(new MouseButtonCallback(this));
 
         // Set callback
-        glfwSetKeyCallback(identifier, keyCallback);
+        glfwSetKeyCallback(internalWindowIdentifier, keyCallback);
-        glfwSetMouseButtonCallback(identifier, mouseButtonCallback);
+        glfwSetMouseButtonCallback(internalWindowIdentifier, mouseButtonCallback);
 
         // Update the window state
         setIcons(getIcons());
         setSize(getSize());
         setMinimumSize(getMinimumSize());
         setMaximumSize(getMaximumSize());
-        setWindowMode(getWindowMode());
+        setMode(getMode());
-
-        // Initialize bgfx
-        initBgfx();
     }
 
     /**
@@ -552,6 +582,10 @@ public final class Window implements AutoCloseable {
      * @since v1-alpha9
      */
     private void initBgfx() {
+        // Ensure the window is not terminated
+        if (terminated)
+            return;
+
         try (MemoryStack stack = stackPush()) {
             Logger.verb("Initializing bgfx");
 
@@ -560,13 +594,29 @@ public final class Window implements AutoCloseable {
             BGFXInit init = BGFXInit.calloc(stack);
             bgfx_init_ctor(init);
 
+            // Set adapter
+            Logger.diag("Setting adapter");
+            init.vendorId(switch (RenderingSubsystemConfiguration.getInstance().getRenderingAdapter()) {
+                case ANY -> BGFX_PCI_ID_NONE;
+                case SOFTWARE -> BGFX_PCI_ID_SOFTWARE_RASTERIZER;
+                case AMD -> BGFX_PCI_ID_AMD;
+                case APPLE -> BGFX_PCI_ID_APPLE;
+                case INTEL -> BGFX_PCI_ID_INTEL;
+                case NVIDIA -> BGFX_PCI_ID_NVIDIA;
+                case MICROSOFT -> BGFX_PCI_ID_MICROSOFT;
+            });
+
             // Set initial resolution
             Logger.diag("Setting initial resolution");
             init
-                    .resolution(it -> it
+                    .resolution(
-                            .width(size.getX())
+                            it -> it
-                            .height(size.getY())
+                                .width(size.getX())
-                            .reset(BGFX_RESET_VSYNC));
+                                .height(size.getY())
+                                .reset(
+                                        BGFX_RESET_VSYNC
+                                )
+                    );
 
             // Determine platform to render for
             Logger.diag("Setting platform");
@@ -574,18 +624,17 @@ public final class Window implements AutoCloseable {
                 case GLFW_PLATFORM_X11 -> init
                         .platformData()
                         .ndt(GLFWNativeX11.glfwGetX11Display())
-                        .nwh(GLFWNativeX11.glfwGetX11Window(identifier));
+                        .nwh(GLFWNativeX11.glfwGetX11Window(internalWindowIdentifier));
                 case GLFW_PLATFORM_WAYLAND -> init
                         .platformData()
                         .ndt(GLFWNativeWayland.glfwGetWaylandDisplay())
-                        .nwh(GLFWNativeWayland.glfwGetWaylandWindow(identifier));
+                        .nwh(GLFWNativeWayland.glfwGetWaylandWindow(internalWindowIdentifier));
                 case GLFW_PLATFORM_WIN32 -> init
                         .platformData()
-                        .nwh(GLFWNativeWin32.glfwGetWin32Window(identifier));
+                        .nwh(GLFWNativeWin32.glfwGetWin32Window(internalWindowIdentifier));
                 case GLFW_PLATFORM_COCOA -> init
                         .platformData()
-                        .nwh(GLFWNativeCocoa.glfwGetCocoaWindow(identifier));
+                        .nwh(GLFWNativeCocoa.glfwGetCocoaWindow(internalWindowIdentifier));
-                case GLFW_PLATFORM_NULL -> {}
                 default -> Logger.crash("Invalid GLFW platform \"" + glfwGetPlatform() + "\"");
             }
 
@@ -595,8 +644,6 @@ public final class Window implements AutoCloseable {
                 Logger.crash("Unable to initialize bgfx");
 
             bgfx_set_debug(BGFX_DEBUG_TEXT);
-            bgfx_set_view_rect(0, 0, 0, size.getX(), size.getY());
-            bgfx_touch(0);
         } catch (UnsatisfiedLinkError error) {
             Logger.crash("Failed to load LWJGL native libraries", error);
         }
@@ -613,7 +660,7 @@ public final class Window implements AutoCloseable {
      */
     public void updateState() throws NotOnMainThreadException {
         // Ensure the window is not terminated
-        if (isTerminated())
+        if (terminated)
             return;
 
         // Ensure running on the main thread
@@ -621,14 +668,14 @@ public final class Window implements AutoCloseable {
             throw new NotOnMainThreadException();
 
         // Update window mode
-        if (Miscellaneous.getBooleanizedInteger(glfwGetWindowAttrib(identifier, GLFW_ICONIFIED)))
+        if (TypeConversion.integerToBoolean(glfwGetWindowAttrib(internalWindowIdentifier, GLFW_ICONIFIED)))
-            setWindowMode(WindowMode.MINIMIZED);
+            mode = Mode.MINIMIZED;
-        else if (Miscellaneous.getBooleanizedInteger(glfwGetWindowAttrib(identifier, GLFW_MAXIMIZED)))
+        else if (TypeConversion.integerToBoolean(glfwGetWindowAttrib(internalWindowIdentifier, GLFW_MAXIMIZED)))
-            setWindowMode(WindowMode.MAXIMIZED);
+            mode = Mode.MAXIMIZED;
-        else if (Miscellaneous.getBooleanizedInteger(glfwGetWindowAttrib(identifier, GLFW_VISIBLE)))
+        else if (TypeConversion.integerToBoolean(glfwGetWindowAttrib(internalWindowIdentifier, GLFW_VISIBLE)))
-            setWindowMode(WindowMode.WINDOWED);
+            mode = Mode.WINDOWED;
-        else if (Miscellaneous.getBooleanizedInteger(glfwGetWindowAttrib(identifier, GLFW_VISIBLE)))
+        else if (TypeConversion.integerToBoolean(glfwGetWindowAttrib(internalWindowIdentifier, GLFW_VISIBLE)))
-            setWindowMode(WindowMode.HIDDEN);
+            mode = Mode.HIDDEN;
 
         // Update monitor
         if (!getMonitor().isConnected()) {
@@ -638,10 +685,12 @@ public final class Window implements AutoCloseable {
                 if (monitor.isConnected())
                     newMonitor = monitor;
 
-            if (newMonitor == null)
+            if (newMonitor == null) {
                 Logger.crash("Unable to set a new target monitor for window " + getUniqueIdentifier() + " as no monitors are connected to the system");
+                return;
+            }
 
-            setMonitor(Objects.requireNonNull(newMonitor));
+            monitor = newMonitor;
         }
 
         // Update vectors
@@ -649,17 +698,17 @@ public final class Window implements AutoCloseable {
             IntBuffer width = stack.mallocInt(2);
             IntBuffer height = stack.mallocInt(2);
 
-            glfwGetWindowSize(identifier, width, height);
+            glfwGetWindowSize(internalWindowIdentifier, width, height);
-            setSize(new Vec2i(width.get(), height.get()));
+            size = new Vec2i(width.get(), height.get());
 
-            glfwGetWindowPos(identifier, width, height);
+            glfwGetWindowPos(internalWindowIdentifier, width, height);
-            setPosition(new Vec2i(width.get(), height.get()));
+            position = new Vec2i(width.get(), height.get());
         }
 
         // Update booleans
-        setResizable(Miscellaneous.getBooleanizedInteger(glfwGetWindowAttrib(identifier, GLFW_RESIZABLE)));
+        resizable = TypeConversion.integerToBoolean(glfwGetWindowAttrib(internalWindowIdentifier, GLFW_RESIZABLE));
-        setOnTop(Miscellaneous.getBooleanizedInteger(glfwGetWindowAttrib(identifier, GLFW_FLOATING)));
+        onTop = TypeConversion.integerToBoolean(glfwGetWindowAttrib(internalWindowIdentifier, GLFW_FLOATING));
-        setTransparent(Miscellaneous.getBooleanizedInteger(glfwGetWindowAttrib(identifier, GLFW_TRANSPARENT_FRAMEBUFFER)));
+        transparent = TypeConversion.integerToBoolean(glfwGetWindowAttrib(internalWindowIdentifier, GLFW_TRANSPARENT_FRAMEBUFFER));
     }
 
     /**
@@ -672,18 +721,15 @@ public final class Window implements AutoCloseable {
      * @since v1-alpha9
      */
     public void render() throws NotOnMainThreadException {
-        // Ensure running on the main thread
-        if (!Miscellaneous.onMainThread())
-            throw new NotOnMainThreadException();
-
         // Ensure the window is not terminated
-        if (isTerminated())
+        if (terminated)
             return;
+
         // Ensure rendering is enabled
         if (!isRendering())
             return;
 
-        glfwSwapBuffers(identifier);
+        bgfx_set_view_rect(0, 0, 0, size.getX(), size.getY());
     }
 
     /**
@@ -696,8 +742,13 @@ public final class Window implements AutoCloseable {
         if (!Miscellaneous.onMainThread())
             throw new NotOnMainThreadException();
 
-        closeInternal();
+        // Ensure the window is not terminated
+        if (terminated)
+            return;
+
+        windows.remove(this);
         terminated = true;
+        closeInternal();
     }
 
     /**
@@ -709,11 +760,12 @@ public final class Window implements AutoCloseable {
      */
     private void closeInternal() {
         // Terminate bgfx
-        bgfx_shutdown();
+        if (glfwGetPlatform() != GLFW_PLATFORM_NULL)
+            bgfx_shutdown();
 
         // Destroy the window
-        Callbacks.glfwFreeCallbacks(identifier);
+        Callbacks.glfwFreeCallbacks(internalWindowIdentifier);
-        glfwDestroyWindow(identifier);
+        glfwDestroyWindow(internalWindowIdentifier);
     }
 
     /**
@@ -724,11 +776,15 @@ public final class Window implements AutoCloseable {
      * @since v1-alpha9
      */
     public boolean isClosureRequested() {
+        // Ensure running on the main thread
+        if (!Miscellaneous.onMainThread())
+            throw new NotOnMainThreadException();
+
         // Ensure the window is not terminated
-        if (isTerminated())
+        if (terminated)
             return false;
 
-        return glfwWindowShouldClose(identifier);
+        return glfwWindowShouldClose(internalWindowIdentifier);
     }
 
     /**
@@ -738,11 +794,15 @@ public final class Window implements AutoCloseable {
      * @since v1-alpha9
      */
     public boolean isFocused() {
+        // Ensure running on the main thread
+        if (!Miscellaneous.onMainThread())
+            throw new NotOnMainThreadException();
+
         // Ensure the window is not terminated
-        if (isTerminated())
+        if (terminated)
             return false;
 
-        return Miscellaneous.getTristatedInteger(glfwGetWindowAttrib(identifier, GLFW_FOCUSED)).toBoolean();
+        return TypeConversion.integerToBoolean(glfwGetWindowAttrib(internalWindowIdentifier, GLFW_FOCUSED));
     }
 
     /**
@@ -752,11 +812,15 @@ public final class Window implements AutoCloseable {
      * @since v1-alpha9
      */
     public void focus() {
+        // Ensure running on the main thread
+        if (!Miscellaneous.onMainThread())
+            throw new NotOnMainThreadException();
+
         // Ensure the window is not terminated
-        if (isTerminated())
+        if (terminated)
             return;
 
-        glfwFocusWindow(identifier);
+        glfwFocusWindow(internalWindowIdentifier);
     }
 
     /**
@@ -770,11 +834,15 @@ public final class Window implements AutoCloseable {
      * @since v1-alpha9
      */
     public void requestAttention() {
+        // Ensure running on the main thread
+        if (!Miscellaneous.onMainThread())
+            throw new NotOnMainThreadException();
+
         // Ensure the window is not terminated
-        if (isTerminated())
+        if (terminated)
             return;
 
-        glfwRequestWindowAttention(identifier);
+        glfwRequestWindowAttention(internalWindowIdentifier);
     }
     
     // -----> Setters & getters
@@ -801,7 +869,7 @@ public final class Window implements AutoCloseable {
      */
     public void setName(@NotNull String name) {
         // Ensure the window is not terminated
-        if (isTerminated())
+        if (terminated)
             return;
 
         this.name = name;
@@ -816,11 +884,11 @@ public final class Window implements AutoCloseable {
      */
     public void setTitle(@NotNull String title) {
         // Ensure the window is not terminated
-        if (isTerminated())
+        if (terminated)
             return;
 
         this.title = title;
-        glfwSetWindowTitle(identifier, title);
+        glfwSetWindowTitle(internalWindowIdentifier, title);
     }
 
     /**
@@ -833,7 +901,7 @@ public final class Window implements AutoCloseable {
     @ApiStatus.Experimental
     public void setIcons(@NotNull Path @Nullable [] icons) {
         // Ensure the window is not terminated
-        if (isTerminated())
+        if (terminated)
             return;
 
         this.icons = icons;
@@ -873,7 +941,7 @@ public final class Window implements AutoCloseable {
                 iconsBuffer.position(0);
                 Logger.diag("setting icons");
                 Logger.flush();
-                glfwSetWindowIcon(identifier, iconsBuffer);
+                glfwSetWindowIcon(internalWindowIdentifier, iconsBuffer);
 
                 // Free icons
                 Logger.diag("freeing icons");
@@ -894,11 +962,11 @@ public final class Window implements AutoCloseable {
      */
     public void setSize(@NotNull Vec2i size) {
         // Ensure the window is not terminated
-        if (isTerminated())
+        if (terminated)
             return;
 
         this.size = size;
-        glfwSetWindowSize(identifier, size.getX(), size.getY());
+        glfwSetWindowSize(internalWindowIdentifier, size.getX(), size.getY());
     }
 
     /**
@@ -911,11 +979,11 @@ public final class Window implements AutoCloseable {
      */
     public void setMinimumSize(@NotNull Vec2i minimumSize) {
         // Ensure the window is not terminated
-        if (isTerminated())
+        if (terminated)
             return;
 
         this.minimumSize = minimumSize;
-        glfwSetWindowSizeLimits(identifier, minimumSize.getX(), minimumSize.getY(), getMaximumSize().getX(), getMaximumSize().getY());
+        glfwSetWindowSizeLimits(internalWindowIdentifier, minimumSize.getX(), minimumSize.getY(), getMaximumSize().getX(), getMaximumSize().getY());
     }
 
     /**
@@ -928,11 +996,11 @@ public final class Window implements AutoCloseable {
      */
     public void setMaximumSize(@NotNull Vec2i maximumSize) {
         // Ensure the window is not terminated
-        if (isTerminated())
+        if (terminated)
             return;
 
         this.maximumSize = maximumSize;
-        glfwSetWindowSizeLimits(identifier, getMinimumSize().getX(), getMinimumSize().getY(), maximumSize.getX(), maximumSize.getY());
+        glfwSetWindowSizeLimits(internalWindowIdentifier, getMinimumSize().getX(), getMinimumSize().getY(), maximumSize.getX(), maximumSize.getY());
     }
 
     /**
@@ -943,49 +1011,50 @@ public final class Window implements AutoCloseable {
      */
     public void setPosition(@NotNull Vec2i position) {
         // Ensure the window is not terminated
-        if (isTerminated())
+        if (isTerminated() || !RenderingSubsystemConfiguration.getInstance().isDebugAllowPositionUpdates())
             return;
 
         this.position = position;
-        glfwSetWindowSize(identifier, position.getX(), position.getY());
+        glfwSetWindowSize(internalWindowIdentifier, position.getX(), position.getY());
     }
 
     /**
      * Sets the window mode.
      *
-     * @param windowMode new mode
+     * @param mode new mode
      * @since v1-alpha9
      */
-    public void setWindowMode(@NotNull WindowMode windowMode) {
+    public void setMode(@NotNull Window.Mode mode) {
         // Ensure the window is not terminated
-        if (isTerminated())
+        if (terminated)
             return;
 
-        this.windowMode = windowMode;
+        this.mode = mode;
-        switch (windowMode) {
+        switch (mode) {
-            case HIDDEN -> glfwHideWindow(identifier);
+            case HIDDEN -> glfwHideWindow(internalWindowIdentifier);
             case WINDOWED -> {
-                glfwShowWindow(identifier);
+                glfwShowWindow(internalWindowIdentifier);
-                glfwRestoreWindow(identifier);
+                glfwRestoreWindow(internalWindowIdentifier);
             }
             case MINIMIZED -> {
-                glfwShowWindow(identifier);
+                glfwShowWindow(internalWindowIdentifier);
-                glfwIconifyWindow(identifier);
+                glfwIconifyWindow(internalWindowIdentifier);
             }
             case MAXIMIZED -> {
-                glfwShowWindow(identifier);
+                glfwShowWindow(internalWindowIdentifier);
-                glfwRestoreWindow(identifier);
+                glfwRestoreWindow(internalWindowIdentifier);
-                glfwMaximizeWindow(identifier);
+                glfwMaximizeWindow(internalWindowIdentifier);
             }
             case BORDERLESS_FULLSCREEN -> {
-                glfwShowWindow(identifier);
+                glfwShowWindow(internalWindowIdentifier);
-                glfwRestoreWindow(identifier);
+                glfwRestoreWindow(internalWindowIdentifier);
+                glfwSetWindowPos(internalWindowIdentifier, 0, 0);
                 // TODO
             }
             case EXCLUSIVE_FULLSCREEN -> {
-                glfwShowWindow(identifier);
+                glfwShowWindow(internalWindowIdentifier);
-                glfwRestoreWindow(identifier);
+                glfwRestoreWindow(internalWindowIdentifier);
-                // TODO
+                glfwSetWindowPos(internalWindowIdentifier, 0, 0);
             }
         }
     }
@@ -998,7 +1067,7 @@ public final class Window implements AutoCloseable {
      */
     public void setResizable(boolean resizable) {
         // Ensure the window is not terminated
-        if (isTerminated())
+        if (terminated)
             return;
 
         this.resizable = resizable;
@@ -1012,7 +1081,7 @@ public final class Window implements AutoCloseable {
      */
     public void setBorderless(boolean borderless) {
         // Ensure the window is not terminated
-        if (isTerminated())
+        if (terminated)
             return;
 
         this.borderless = borderless;
@@ -1026,7 +1095,7 @@ public final class Window implements AutoCloseable {
      */
     public void setFocusable(boolean focusable) {
         // Ensure the window is not terminated
-        if (isTerminated())
+        if (terminated)
             return;
 
         this.focusable = focusable;
@@ -1040,7 +1109,7 @@ public final class Window implements AutoCloseable {
      */
     public void setOnTop(boolean onTop) {
         // Ensure the window is not terminated
-        if (isTerminated())
+        if (terminated)
             return;
 
         this.onTop = onTop;
@@ -1057,14 +1126,79 @@ public final class Window implements AutoCloseable {
      */
     public void setTransparent(boolean transparent) {
         // Ensure the window is not terminated
-        if (isTerminated())
+        if (terminated)
             return;
 
         this.transparent = transparent;
         initializeWindow();
     }
 
-    // -----> Builder inner class
+    // -----> Inner classes
+    /**
+     * How a window can be displayed.
+     *
+     * @since v1-alpha9
+     */
+    public enum Mode {
+        /**
+         * Marks the window as hidden, making it invisible and unable to be interacted with.
+         *
+         * @since v1-alpha9
+         */
+        HIDDEN,
+
+        /**
+         * Marks the window as windowed, which
+         * will allow the user to drag around the window freely.
+         *
+         * @since v1-alpha9
+         */
+        WINDOWED,
+
+        /**
+         * Same as {@link #HIDDEN} mode, but the window can be
+         * summoned back into {@link #WINDOWED} mode by the user
+         * by (for example) clicking an icon or {@code ALT+TAB}-ing.
+         *
+         * @since v1-alpha9
+         */
+        MINIMIZED,
+
+        /**
+         * Same as {@link #WINDOWED}, but will make the window occupy
+         * most of the screen space, except for windows/bars/docks.
+         *
+         * @since v1-alpha9
+         */
+        MAXIMIZED,
+
+        /**
+         * Makes the window will have the same
+         * size as the monitor it is currently on.
+         *
+         * @since v1-alpha9
+         */
+        BORDERLESS_FULLSCREEN,
+
+        /**
+         * Makes the window occupy the entire
+         * monitor it is currently on without
+         * allowing other windows to occupy
+         * the same space.
+         * <p>
+         * This will increase rendering
+         * throughput as the window manager
+         * or compositor does not need to
+         * care about other windows occupying
+         * the same monitor. Use (and recommend)
+         * this mode if you/your users
+         * want more frames per second.
+         *
+         * @since v1-alpha9
+         */
+        EXCLUSIVE_FULLSCREEN
+    }
+
     /**
      * Provides an API for building {@link Window}s more easily.
      *
@@ -1131,10 +1265,10 @@ public final class Window implements AutoCloseable {
         /**
          * Contains the window mode.
          *
-         * @see Window#windowMode
+         * @see Window#mode
          * @since v1-alpha9
          */
-        private @Nullable WindowMode windowMode = null;
+        private @Nullable Window.Mode mode = null;
 
         /**
          * Contains the target monitor.
@@ -1235,8 +1369,8 @@ public final class Window implements AutoCloseable {
                 minimumSize = new Vec2i(-1, -1);
             if (maximumSize == null)
                 maximumSize = new Vec2i(-1, -1);
-            if (windowMode == null)
+            if (mode == null)
-                windowMode = WindowMode.WINDOWED;
+                mode = Mode.WINDOWED;
             if (monitor == null)
                 monitor = Monitor.getMonitors().getFirst();
 
@@ -1255,7 +1389,7 @@ public final class Window implements AutoCloseable {
                 renderingBoolean = false;
 
             // Create new Window instance
-            return new Window(name, title, icons, size, minimumSize, maximumSize, position, windowMode, monitor, resizableBoolean, borderlessBoolean, focusableBoolean, onTopBoolean, transparentBoolean, renderingBoolean);
+            return new Window(name, title, icons, size, minimumSize, maximumSize, position, mode, monitor, resizableBoolean, borderlessBoolean, focusableBoolean, onTopBoolean, transparentBoolean, renderingBoolean);
         }
 
         /**
@@ -1340,11 +1474,11 @@ public final class Window implements AutoCloseable {
          * Returns the window mode.
          *
          * @return window mode
-         * @see Window#windowMode
+         * @see Window#mode
          * @since v1-alpha9
          */
-        public @Nullable WindowMode getWindowMode() {
+        public @Nullable Window.Mode getWindowMode() {
-            return windowMode;
+            return mode;
         }
 
         /**
@@ -1519,13 +1653,13 @@ public final class Window implements AutoCloseable {
         /**
          * Sets the window mode.
          *
-         * @param windowMode new window mode
+         * @param mode new window mode
          * @return builder instance
-         * @see Window#windowMode
+         * @see Window#mode
          * @since v1-alpha9
          */
-        public @NotNull Builder setWindowMode(@Nullable WindowMode windowMode) {
+        public @NotNull Builder setWindowMode(@Nullable Window.Mode mode) {
-            this.windowMode = windowMode;
+            this.mode = mode;
             return this;
         }
 

rendering/src/main/java/de/staropensource/engine/rendering/type/window/RenderingAdapter.java

@@ -20,66 +20,57 @@
 package de.staropensource.engine.rendering.type.window;
 
 /**
- * Contains how a window should be displayed.
+ * Represents all available rendering adapters.
  *
  * @since v1-alpha9
  */
-public enum WindowMode {
+public enum RenderingAdapter {
     /**
-     * Marks the window as hidden, making it invisible and unable to be interacted with.
+     * Allows the bgfx to autodetect the adapter to use.
      *
      * @since v1-alpha9
      */
-    HIDDEN,
+    ANY,
 
     /**
-     * Marks the window as windowed, which
+     * Tells bgfx to use the CPU for rendering.
-     * will allow the user to drag around the window freely.
      *
      * @since v1-alpha9
      */
-    WINDOWED,
+    SOFTWARE,
 
     /**
-     * Same as {@link #HIDDEN} mode, but the window can be
+     * Tells bgfx to use AMD graphics cards for rendering.
-     * summoned back into {@link #WINDOWED} mode by the user
-     * by (for example) clicking an icon or {@code ALT+TAB}-ing.
      *
      * @since v1-alpha9
      */
-    MINIMIZED,
+    AMD,
 
     /**
-     * Same as {@link #WINDOWED}, but will make the window occupy
+     * Tells bgfx to use Apple's SOC for rendering.
-     * most of the screen space, except for windows/bars/docks.
      *
      * @since v1-alpha9
      */
-    MAXIMIZED,
+    APPLE,
 
     /**
-     * Makes the window will have the same
+     * Tells bgfx to use Intel graphics cards for rendering.
-     * size as the monitor it is currently on.
      *
      * @since v1-alpha9
      */
-    BORDERLESS_FULLSCREEN,
+    INTEL,
 
     /**
-     * Makes the window occupy the entire
+     * Tells bgfx to use NVIDIA graphics cards for rendering.
-     * monitor it is currently on without
-     * allowing other windows to occupy
-     * the same space.
-     * <p>
-     * This will increase rendering
-     * throughput as the window manager
-     * or compositor does not need to
-     * care about other windows occupying
-     * the same monitor. Use (and recommend)
-     * this mode if you/your users
-     * want more frames per second.
      *
      * @since v1-alpha9
      */
-    EXCLUSIVE_FULLSCREEN
+    NVIDIA,
+
+    /**
+     * Tells bgfx to use Windows' integrated graphics driver for rendering.
+     *
+     * @since v1-alpha9
+     */
+    MICROSOFT,
 }

rendering/src/main/java/de/staropensource/engine/rendering/type/window/RenderingPlatform.java

@@ -20,13 +20,13 @@
 package de.staropensource.engine.rendering.type.window;
 
 /**
- * Represents all available platforms.
+ * Represents all available rendering platforms.
  *
  * @since v1-alpha9
  */
 public enum RenderingPlatform {
     /**
-     * Allows the subsystem to autodetect the platform to use.
+     * Allows GLFW to autodetect the platform to use.
      *
      * @since v1-alpha9
      */
@@ -61,7 +61,7 @@ public enum RenderingPlatform {
     COCOA,
 
     /**
-     * Prefer initializing without any platform.
+     * Prefer initializing headless.
      *
      * @since v1-alpha9
      */

rendering/src/main/java/de/staropensource/engine/rendering/type/window/VsyncMode.java

@@ -42,5 +42,10 @@ public enum VsyncMode {
      *
      * @since v1-alpha9
      */
-    ON
+    ON,
+
+    /**
+     * Party
+     */
+    PARTY
 }

rendering/src/main/java/module-info.java

@@ -14,11 +14,13 @@ module sosengine.rendering {
     requires org.lwjgl.stb;
     requires org.lwjgl.glfw;
     requires org.lwjgl.bgfx;
+    requires java.desktop;
 
     // API access
     exports de.staropensource.engine.rendering;
     exports de.staropensource.engine.rendering.event;
     exports de.staropensource.engine.rendering.exception;
+    exports de.staropensource.engine.rendering.renderer;
     exports de.staropensource.engine.rendering.type;
     exports de.staropensource.engine.rendering.type.input;
     exports de.staropensource.engine.rendering.type.window;
@@ -27,6 +29,7 @@ module sosengine.rendering {
     opens de.staropensource.engine.rendering;
     opens de.staropensource.engine.rendering.event;
     opens de.staropensource.engine.rendering.exception;
+    opens de.staropensource.engine.rendering.renderer;
     opens de.staropensource.engine.rendering.type;
     opens de.staropensource.engine.rendering.type.input;
     opens de.staropensource.engine.rendering.type.window;

testapp/src/main/java/de/staropensource/engine/testapp/Main.java

@@ -25,9 +25,9 @@ import de.staropensource.engine.base.implementable.EventListenerCode;
 import de.staropensource.engine.base.implementable.helper.EventHelper;
 import de.staropensource.engine.base.logging.Logger;
 import de.staropensource.engine.base.type.vector.Vec2i;
-import de.staropensource.engine.base.utility.misc.Miscellaneous;
-import de.staropensource.engine.rendering.RenderingSubsystem;
 import de.staropensource.engine.rendering.event.InputEvent;
+import de.staropensource.engine.rendering.renderer.Renderer;
+import de.staropensource.engine.rendering.type.FrameHandler;
 import de.staropensource.engine.rendering.type.Window;
 import de.staropensource.engine.rendering.type.input.Key;
 import de.staropensource.engine.rendering.type.input.KeyState;
@@ -35,8 +35,6 @@ import lombok.Getter;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
-import java.util.LinkedHashMap;
-
 /**
  * The main class of the sos!engine development application.
  *
@@ -140,14 +138,23 @@ public final class Main {
                 return;
             }
 
-            // Render loop
+            // Add frame handlers
-            LinkedHashMap<@NotNull Window, @NotNull Throwable> renderLoopFailures = RenderingSubsystem
+            Renderer.addFrameHandler(new FrameHandler() {
-                    .getInstance()
+                @Override
-                    .runRenderLoop(() -> {
+                public @NotNull FrameHandler.Priority getPriority() {
-                        if (shutdown || window.isClosureRequested())
+                    return Priority.DEFAULT;
-                            Engine.getInstance().shutdown();
+                }
-                    });
+                @Override
+                public void run() {
+                    if (shutdown || window.isClosureRequested())
+                        Engine.getInstance().shutdown();
 
+                    //window.setPosition(new Vec2i((int) Renderer.getFrameCount() / 10, (int) Renderer.getFrameCount() / 10));
+                }
+            });
+
+            // Start renderer
+            Renderer.start();
         } catch (Exception exception) {
             Logger.crash("Caught throwable in main thread:", exception);
         }