Allow VertexViews to hold a memory owner

- Remove MemoryBlock parameter from SimpleQuadMesh constructors

common/src/api/java/dev/engine_room/flywheel/api/model/Model.java

@@ -2,12 +2,10 @@ package dev.engine_room.flywheel.api.model;
 
 import java.util.List;
 
-import dev.engine_room.flywheel.api.instance.InstanceType;
-
-import dev.engine_room.flywheel.api.instance.InstancerProvider;
-
 import org.joml.Vector4fc;
 
+import dev.engine_room.flywheel.api.instance.InstanceType;
+import dev.engine_room.flywheel.api.instance.InstancerProvider;
 import dev.engine_room.flywheel.api.material.Material;
 
 public interface Model {

common/src/lib/java/dev/engine_room/flywheel/lib/model/SimpleQuadMesh.java

@@ -6,25 +6,21 @@ import org.joml.Vector4fc;
 
 import dev.engine_room.flywheel.api.vertex.MutableVertexList;
 import dev.engine_room.flywheel.api.vertex.VertexList;
-import dev.engine_room.flywheel.lib.memory.MemoryBlock;
 
 public final class SimpleQuadMesh implements QuadMesh {
 	private final VertexList vertexList;
-	// Unused but we need to hold on to a reference so the cleaner doesn't nuke us.
-	private final MemoryBlock data;
 	private final Vector4f boundingSphere;
 	@Nullable
 	private final String descriptor;
 
-	public SimpleQuadMesh(VertexList vertexList, MemoryBlock data, @Nullable String descriptor) {
+	public SimpleQuadMesh(VertexList vertexList, @Nullable String descriptor) {
 		this.vertexList = vertexList;
-		this.data = data;
 		boundingSphere = ModelUtil.computeBoundingSphere(vertexList);
 		this.descriptor = descriptor;
 	}
 
-	public SimpleQuadMesh(VertexList vertexList, MemoryBlock data) {
-		this(vertexList, data, null);
+	public SimpleQuadMesh(VertexList vertexList) {
+		this(vertexList, null);
 	}
 
 	@Override

common/src/lib/java/dev/engine_room/flywheel/lib/model/baked/MeshHelper.java

@@ -41,7 +41,8 @@ final class MeshHelper {
 
 		vertexView.ptr(dstPtr);
 		vertexView.vertexCount(vertexCount);
+		vertexView.nativeMemoryOwner(dst);
 
-		return new SimpleQuadMesh(vertexView, dst, meshDescriptor);
+		return new SimpleQuadMesh(vertexView, meshDescriptor);
 	}
 }

common/src/lib/java/dev/engine_room/flywheel/lib/model/part/ModelPartConverter.java

@@ -37,7 +37,7 @@ public final class ModelPartConverter {
 
 		VertexView vertexView = new PosTexNormalVertexView();
 		vertexView.load(data);
-		return new SimpleQuadMesh(vertexView, data, "source=ModelPartConverter");
+		return new SimpleQuadMesh(vertexView, "source=ModelPartConverter");
 	}
 
 	public static Mesh convert(ModelLayerLocation layer, @Nullable TextureAtlasSprite sprite, String... childPath) {

common/src/lib/java/dev/engine_room/flywheel/lib/vertex/AbstractVertexView.java

@@ -1,8 +1,12 @@
 package dev.engine_room.flywheel.lib.vertex;
 
+import org.jetbrains.annotations.Nullable;
+
 public abstract class AbstractVertexView implements VertexView {
 	protected long ptr;
 	protected int vertexCount;
+	@Nullable
+	private Object nativeMemoryOwner;
 
 	@Override
 	public long ptr() {
@@ -23,4 +27,15 @@ public abstract class AbstractVertexView implements VertexView {
 	public void vertexCount(int vertexCount) {
 		this.vertexCount = vertexCount;
 	}
+
+	@Override
+	@Nullable
+	public final Object nativeMemoryOwner() {
+		return nativeMemoryOwner;
+	}
+
+	@Override
+	public final void nativeMemoryOwner(@Nullable Object owner) {
+		nativeMemoryOwner = owner;
+	}
 }

common/src/lib/java/dev/engine_room/flywheel/lib/vertex/VertexView.java

@@ -1,5 +1,6 @@
 package dev.engine_room.flywheel.lib.vertex;
 
+import org.jetbrains.annotations.Nullable;
 import org.lwjgl.system.MemoryUtil;
 
 import dev.engine_room.flywheel.api.vertex.MutableVertexList;
@@ -14,6 +15,17 @@ public interface VertexView extends MutableVertexList {
 
 	long stride();
 
+	@Nullable
+	Object nativeMemoryOwner();
+
+	/**
+	 * The memory referenced by this vertex view's pointer may be owned by another object, such that the memory is
+	 * automatically freed when the other object becomes phantom reachable or is garbage collected. Use this method to
+	 * ensure this vertex view retains a strong reference to the memory owner so this vertex view's pointer remains
+	 * valid even when no other references to the memory owner are retained.
+	 */
+	void nativeMemoryOwner(@Nullable Object owner);
+
 	default void load(MemoryBlock data) {
 		long bytes = data.size();
 		long stride = stride();
@@ -24,6 +36,7 @@ public interface VertexView extends MutableVertexList {
 
 		ptr(data.ptr());
 		vertexCount(vertexCount);
+		nativeMemoryOwner(data);
 	}
 
 	@Override