Rough Scene/SceneManager implementation

src/main/java/org/hirw/game/Scene.java

@@ -0,0 +1,8 @@
+package org.hirw.game;
+
+
+public abstract class Scene {
+  public Scene() {}
+
+  abstract void update();
+}

src/main/java/org/hirw/game/SceneManager.java

@@ -0,0 +1,20 @@
+package org.hirw.game;
+
+import java.util.EnumMap;
+import java.util.Map;
+import lombok.Getter;
+
+final class SceneManager {
+  private static final EnumMap<SceneType, Scene> SCENES =
+      new EnumMap<>(
+          Map.of(
+              SceneType.SPLASH, new SplashScene(),
+              SceneType.MENU, new SplashScene(),
+              SceneType.GAME, new SplashScene()));
+
+  @Getter private static Scene scene = SCENES.get(SceneType.SPLASH);
+
+  public static void setScene(SceneType sType) {
+    scene = SCENES.get(sType);
+  }
+}

src/main/java/org/hirw/game/SceneType.java

@@ -0,0 +1,7 @@
+package org.hirw.game;
+
+public enum SceneType {
+  SPLASH,
+  MENU,
+  GAME
+}

src/main/java/org/hirw/game/SplashScene.java

@@ -0,0 +1,19 @@
+package org.hirw.game;
+
+import static org.lwjgl.opengl.GL11.*;
+
+import java.util.Objects;
+import org.hirw.game.util.Time;
+
+public class SplashScene extends Scene {
+  private float ramp = 0.0f;
+
+  public void update() {
+    if (Objects.isNull(Window.get().getGlfwWindow())) {
+      return;
+    }
+
+    glClearColor(this.ramp, this.ramp, this.ramp, 0.0f);
+    this.ramp += 0.5f * Time.deltaTime();
+  }
+}

src/main/java/org/hirw/game/Window.java

@@ -5,6 +5,7 @@ import static org.lwjgl.glfw.GLFW.*;
 import static org.lwjgl.opengl.GL11.*;
 import static org.lwjgl.system.MemoryUtil.*;
 
+import lombok.Getter;
 import org.hirw.game.util.Time;
 import org.lwjgl.Version;
 import org.lwjgl.glfw.*;
@@ -13,7 +14,7 @@ import org.lwjgl.opengl.*;
 public class Window {
   private int width, height;
   private final String title;
-  private long glfwWindow;
+  @Getter private long glfwWindow;
 
   private static Window window = null;
 
@@ -78,13 +79,13 @@ public class Window {
     glfwShowWindow(glfwWindow);
 
     GL.createCapabilities();
-    glClearColor(1.0f, 0.0f, 2.0f, 0.0f);
+    glClearColor(0.0f, 0.0f, 2.0f, 0.0f);
   }
 
   private void loop() {
     while (!glfwWindowShouldClose(glfwWindow)) {
       Time.update();
-      System.out.println(Time.deltaTime());
+      SceneManager.getScene().update();
       glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
       glfwSwapBuffers(glfwWindow);
       glfwPollEvents();