Models are temporary

- Add Model.delete
- Allow BlockModel.createEBO to be called more than once for a single
instance
- Clear cache on QuadConverter.delete

src/main/java/com/jozufozu/flywheel/backend/instancing/instancing/GPUInstancer.java

@@ -69,7 +69,6 @@ public class GPUInstancer<D extends InstanceData> extends AbstractInstancer<D> {
 
 		vao = new GlVertexArray();
 
-		// XXX Callback seems unnecessary. Remove and extract code to run after alloc call?
 		model = modelAllocator.alloc(modelData, arenaModel -> {
 			// XXX VAO is bound and not reset or restored
 			vao.bind();
@@ -77,7 +76,7 @@ public class GPUInstancer<D extends InstanceData> extends AbstractInstancer<D> {
 			arenaModel.setupState(vao);
 		});
 
-		// XXX VAO is already guaranteed to be bound in model callback
+		// XXX VAO is bound and not reset or restored
 		vao.bind();
 		vao.enableArrays(model.getAttributeCount() + instanceFormat.getAttributeCount());
 

src/main/java/com/jozufozu/flywheel/core/QuadConverter.java

@@ -79,6 +79,7 @@ public class QuadConverter {
 
 	public void delete() {
 		GL32.glDeleteBuffers(ebo);
+		this.cache.clear();
 		this.quadCapacity = 0;
 	}
 

src/main/java/com/jozufozu/flywheel/core/hardcoded/ModelPart.java

@@ -51,4 +51,15 @@ public class ModelPart implements Model {
 	public VertexList getReader() {
 		return reader;
 	}
+
+	@Override
+	public void delete() {
+		if (reader instanceof AutoCloseable closeable) {
+			try {
+				closeable.close();
+			} catch (Exception e) {
+				//
+			}
+		}
+	}
 }

src/main/java/com/jozufozu/flywheel/core/model/BlockModel.java

@@ -47,4 +47,15 @@ public class BlockModel implements Model {
 	public VertexList getReader() {
 		return reader;
 	}
+
+	@Override
+	public void delete() {
+		if (reader instanceof AutoCloseable closeable) {
+			try {
+				closeable.close();
+			} catch (Exception e) {
+				//
+			}
+		}
+	}
 }

src/main/java/com/jozufozu/flywheel/core/model/Model.java

@@ -62,6 +62,8 @@ public interface Model {
 				.quads2Tris(vertexCount() / 4);
 	}
 
+	void delete();
+
 	/**
 	 * The size in bytes that this model's data takes up.
 	 */