app/src/main/java/chess/view/DDDrender/DDDModel.java

@@ -1,10 +1,12 @@
 package chess.view.DDDrender;
 
+import java.io.Closeable;
+import java.io.IOException;
 import java.util.List;
 
 import chess.view.DDDrender.opengl.VertexArray;
 
-public class DDDModel {
+public class DDDModel implements Closeable {
 	private final List<VertexArray> vaos;
 
 	public DDDModel(List<VertexArray> vaos) {
@@ -15,4 +17,11 @@ public class DDDModel {
 		return vaos;
 	}
 
+	@Override
+	public void close() throws IOException {
+		for (VertexArray vertexArray : vaos) {
+			vertexArray.close();
+		}
+	}
+
 }

app/src/main/java/chess/view/DDDrender/DDDView.java

@@ -23,15 +23,13 @@ public class DDDView extends GameAdaptator {
 
 	private final CommandExecutor commandExecutor;
 	private final Window window;
-	private final Renderer renderer;
 	private final World world;
 	private BoardEntity boardEntity;
 
 	public DDDView(CommandExecutor commandExecutor) {
 		this.commandExecutor = commandExecutor;
-		this.renderer = new Renderer();
 		this.world = new World();
-		this.window = new Window(this.renderer, this.world, new Camera());
+		this.window = new Window(new Renderer(), this.world, new Camera());
 	}
 
 	// Invoked when a cell is clicked
@@ -114,6 +112,14 @@ public class DDDView extends GameAdaptator {
 		// cam.setRotateAngle(cam.getRotateAngle() + angle * delta);
 		// });
 		this.window.run();
+
+		// free OpenGL resources
+		try {
+			this.window.close();
+			this.world.close();
+		} catch (IOException e) {
+			e.printStackTrace();
+		}
 	}
 
 }

app/src/main/java/chess/view/DDDrender/Renderer.java

@@ -2,6 +2,9 @@ package chess.view.DDDrender;
 
 import static org.lwjgl.opengl.GL11.GL_UNSIGNED_INT;
 
+import java.io.Closeable;
+import java.io.IOException;
+
 import org.joml.Matrix4f;
 import org.joml.Vector3f;
 import org.lwjgl.opengl.GL30;
@@ -11,7 +14,7 @@ import chess.view.DDDrender.shader.BoardShader;
 import chess.view.DDDrender.shader.PieceShader;
 import chess.view.DDDrender.shader.ShaderProgram;
 
-public class Renderer {
+public class Renderer implements Closeable{
 	private BoardShader boardShader;
 	private PieceShader pieceShader;
 
@@ -56,4 +59,10 @@ public class Renderer {
 	public BoardShader getBoardShader() {
 		return boardShader;
 	}
+
+	@Override
+	public void close() throws IOException {
+		this.boardShader.close();
+		this.pieceShader.close();
+	}
 }

app/src/main/java/chess/view/DDDrender/Window.java

@@ -11,6 +11,8 @@ import chess.view.DDDrender.world.Entity;
 import chess.view.DDDrender.world.World;
 import common.Signal1;
 
+import java.io.Closeable;
+import java.io.IOException;
 import java.nio.*;
 import java.util.ArrayList;
 import java.util.List;
@@ -24,7 +26,7 @@ import static org.lwjgl.opengl.GL11.*;
 import static org.lwjgl.system.MemoryStack.*;
 import static org.lwjgl.system.MemoryUtil.*;
 
-public class Window {
+public class Window implements Closeable{
 
 	// The window handle
 	private long window;
@@ -225,4 +227,9 @@ public class Window {
 		}
 	}
 
+	@Override
+	public void close() throws IOException {
+		this.renderer.close();
+	}
+
 }

app/src/main/java/chess/view/DDDrender/opengl/ElementBuffer.java

@@ -1,10 +1,13 @@
 package chess.view.DDDrender.opengl;
 
+import java.io.Closeable;
+import java.io.IOException;
+
 import org.lwjgl.opengl.GL30;
 
-public class ElementBuffer {
+public class ElementBuffer implements Closeable {
-	private int id;
+	private final int id;
-	private int indiciesCount;
+	private final int indiciesCount;
 
 	public ElementBuffer(int[] indicies) {
 		this.indiciesCount = indicies.length;
@@ -15,10 +18,6 @@ public class ElementBuffer {
 		Unbind();
 	}
 
-	public void Destroy() {
-		GL30.glDeleteBuffers(this.id);
-	}
-
 	public void Bind() {
 		GL30.glBindBuffer(GL30.GL_ELEMENT_ARRAY_BUFFER, this.id);
 	}
@@ -30,4 +29,9 @@ public class ElementBuffer {
 	public int GetIndiciesCount() {
 		return this.indiciesCount;
 	}
+
+	@Override
+	public void close() throws IOException {
+		GL30.glDeleteBuffers(this.id);
+	}
 }

app/src/main/java/chess/view/DDDrender/opengl/VertexArray.java

@@ -1,14 +1,17 @@
 package chess.view.DDDrender.opengl;
 
+import java.io.Closeable;
+import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
 
 import org.lwjgl.opengl.GL30;
 
-public class VertexArray {
+public class VertexArray implements Closeable {
-	private int id;
+
-	private ElementBuffer elementBuffer;
+	private final int id;
-	private List<VertexBuffer> vertexBuffers;
+	private final ElementBuffer elementBuffer;
+	private final List<VertexBuffer> vertexBuffers;
 
 	public VertexArray(ElementBuffer elementBuffer) {
 		this.id = GL30.glGenVertexArrays();
@@ -19,10 +22,6 @@ public class VertexArray {
 		Unbind();
 	}
 
-	public void Destroy() {
-		GL30.glDeleteBuffers(this.id);
-	}
-
 	public int GetVertexCount() {
 		return this.elementBuffer.GetIndiciesCount();
 	}
@@ -48,4 +47,13 @@ public class VertexArray {
 	public List<VertexBuffer> getVertexBuffers() {
 		return vertexBuffers;
 	}
+
+	@Override
+	public void close() throws IOException {
+		GL30.glDeleteBuffers(this.id);
+		for (VertexBuffer vertexBuffer : vertexBuffers) {
+			vertexBuffer.close();
+		}
+		elementBuffer.close();
+	}
 }

app/src/main/java/chess/view/DDDrender/opengl/VertexBuffer.java

@@ -2,15 +2,17 @@ package chess.view.DDDrender.opengl;
 
 import static org.lwjgl.opengl.GL11.GL_FLOAT;
 
+import java.io.Closeable;
+import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
 
 import org.lwjgl.opengl.GL30;
 
-public class VertexBuffer {
+public class VertexBuffer implements Closeable {
-	private int id;
+	private final int id;
-	private int dataStride;
+	private final int dataStride;
-	List<VertexAttribPointer> vertexAttribs;
+	private final List<VertexAttribPointer> vertexAttribs;
 
 	public VertexBuffer(float[] data, int stride) {
 		this.id = GL30.glGenBuffers();
@@ -28,10 +30,6 @@ public class VertexBuffer {
 		Unbind();
 	}
 
-	public void Destroy() {
-		GL30.glDeleteBuffers(id);
-	}
-
 	public void Bind() {
 		GL30.glBindBuffer(GL30.GL_ARRAY_BUFFER, this.id);
 	}
@@ -52,4 +50,9 @@ public class VertexBuffer {
 					this.dataStride * 4, vertexAttribPointer.offset());
 		}
 	}
+
+	@Override
+	public void close() throws IOException {
+		GL30.glDeleteBuffers(id);
+	}
 }

app/src/main/java/chess/view/DDDrender/shader/ShaderProgram.java

@@ -1,5 +1,7 @@
 package chess.view.DDDrender.shader;
 
+import java.io.Closeable;
+import java.io.IOException;
 import java.nio.FloatBuffer;
 import java.nio.IntBuffer;
 
@@ -9,7 +11,7 @@ import org.lwjgl.BufferUtils;
 import org.lwjgl.opengl.GL30;
 import org.lwjgl.system.MemoryStack;
 
-public abstract class ShaderProgram {
+public abstract class ShaderProgram implements Closeable {
 	private int programId;
 	private int vertexShaderId;
 	private int fragmentShaderId;
@@ -91,4 +93,11 @@ public abstract class ShaderProgram {
 			GL30.glUniformMatrix4fv(location, false, buffer);
 		}
 	}
+
+	@Override
+	public void close() throws IOException {
+		GL30.glDeleteShader(vertexShaderId);
+		GL30.glDeleteShader(fragmentShaderId);
+		GL30.glDeleteProgram(programId);
+	}
 }

app/src/main/java/chess/view/DDDrender/world/BoardEntity.java

@@ -1,5 +1,7 @@
 package chess.view.DDDrender.world;
 
+import java.io.IOException;
+
 import org.joml.Vector3f;
 
 import chess.model.Coordinate;
@@ -38,4 +40,9 @@ public class BoardEntity extends Entity {
 		renderer.RenderVao(renderer.getBoardShader(), vao);
 	}
 
+	@Override
+	public void close() throws IOException {
+		vao.close();
+	}
+
 }

app/src/main/java/chess/view/DDDrender/world/Entity.java

@@ -1,9 +1,11 @@
 package chess.view.DDDrender.world;
 
+import java.io.Closeable;
+
 import chess.view.DDDrender.Renderer;
 
-public abstract class Entity {
+public abstract class Entity implements Closeable{
 
 	public abstract void render(Renderer renderer);
-	
+
 }

app/src/main/java/chess/view/DDDrender/world/ModelEntity.java

@@ -1,5 +1,7 @@
 package chess.view.DDDrender.world;
 
+import java.io.IOException;
+
 import org.joml.Vector3f;
 
 import chess.view.DDDrender.DDDModel;
@@ -36,4 +38,9 @@ public class ModelEntity extends Entity {
 		this.rotation = rotation;
 	}
 
+	@Override
+	public void close() throws IOException {
+		this.model.close();
+	}
+
 }

app/src/main/java/chess/view/DDDrender/world/World.java

@@ -1,5 +1,7 @@
 package chess.view.DDDrender.world;
 
+import java.io.Closeable;
+import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -7,7 +9,7 @@ import chess.model.Coordinate;
 import chess.model.Move;
 import chess.model.Piece;
 
-public class World {
+public class World implements Closeable{
 	/** Renderable entity list */
 	private final List<Entity> entites;
 
@@ -55,4 +57,11 @@ public class World {
 		return entites;
 	}
 
+	@Override
+	public void close() throws IOException {
+		for (Entity entity : entites) {
+			entity.close();
+		}
+	}
+
 }