A fix and a refactor

- ModelPools no longer undbind their buffer during construction, as state should be maintained externally
 - Call BufferUploader#reset at the end of renderChunkLayer to partially fix crash rendering contraptions
 - Remove Engine#getName, it was replaced by FlwEngine

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

@@ -3,5 +3,4 @@ package com.jozufozu.flywheel.backend.instancing;
 import com.jozufozu.flywheel.api.MaterialManager;
 
 public interface Engine extends RenderDispatcher, MaterialManager {
-	String getName();
 }

src/main/java/com/jozufozu/flywheel/backend/instancing/batching/BatchingEngine.java

@@ -70,8 +70,4 @@ public class BatchingEngine implements Engine {
 
 	}
 
-	@Override
-	public String getName() {
-		return "Batching";
-	}
 }

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

@@ -160,11 +160,6 @@ public class InstancingEngine<P extends WorldProgram> implements Engine {
 		}
 	}
 
-	@Override
-	public String getName() {
-		return "GL33 Instanced Arrays";
-	}
-
 	@FunctionalInterface
 	public interface OriginShiftListener {
 		void onOriginShift();

src/main/java/com/jozufozu/flywheel/backend/model/ModelPool.java

@@ -31,6 +31,12 @@ public class ModelPool implements ModelAllocator {
 	private boolean dirty;
 	private boolean anyToRemove;
 
+	/**
+	 * Create a new model pool.
+	 *
+	 * @param vertexType The vertex type of the models that will be stored in the pool.
+	 * @param initialSize The initial size of the pool, in vertices.
+	 */
 	public ModelPool(VertexType vertexType, int initialSize) {
 		this.vertexType = vertexType;
 		int stride = vertexType.getStride();
@@ -40,7 +46,6 @@ public class ModelPool implements ModelAllocator {
 		vbo.bind();
 		vbo.ensureCapacity((long) stride * initialSize);
 		vbo.setGrowthMargin(stride * 64);
-		vbo.unbind();
 	}
 
 	/**

src/main/java/com/jozufozu/flywheel/mixin/LevelRendererMixin.java

@@ -16,6 +16,7 @@ import com.jozufozu.flywheel.core.crumbling.CrumblingRenderer;
 import com.jozufozu.flywheel.event.BeginFrameEvent;
 import com.jozufozu.flywheel.event.ReloadRenderersEvent;
 import com.jozufozu.flywheel.event.RenderLayerEvent;
+import com.mojang.blaze3d.vertex.BufferUploader;
 import com.mojang.blaze3d.vertex.PoseStack;
 import com.mojang.math.Matrix4f;
 
@@ -73,6 +74,7 @@ public class LevelRendererMixin {
 			flywheel$renderLayer(type, stack, camX, camY, camZ);
 		}
 		flywheel$LayerRendered = false;
+		BufferUploader.reset();
 	}
 
 	@Unique