diff --git a/src/d3d11/d3d11_context_impl.cpp b/src/d3d11/d3d11_context_impl.cpp
index 4bc62a20..b8c67832 100644
--- a/src/d3d11/d3d11_context_impl.cpp
+++ b/src/d3d11/d3d11_context_impl.cpp
@@ -3602,25 +3602,6 @@ template <typename ContextInternalState> class MTLD3D11DeviceContextImplBase : p
         });
       });
     }
-    // auto previous_encoder = GetLastEncoder();
-    // assert(previous_encoder->kind == EncoderKind::Render);
-    // auto previous_renderpass = (ENCODER_RENDER_INFO *)previous_encoder;
-    // if (!active_occlusion_queries.empty()) {
-    //   previous_renderpass->use_visibility_result = 1;
-    //   if (auto next_offset = vro_state.getNextWriteOffset(true); next_offset != ~0uLL) {
-    //     EmitCommand([next_offset](CommandChunk::context &ctx) {
-    //       ctx.render_encoder->setVisibilityResultMode(
-    //           MTL::VisibilityResultModeCounting, (ctx.visibility_offset_base + next_offset) << 3
-    //       );
-    //     });
-    //   }
-    // } else {
-    //   if (vro_state.getNextWriteOffset(false) != ~0uLL && previous_renderpass->use_visibility_result) {
-    //     EmitCommand([](CommandChunk::context &ctx) {
-    //       ctx.render_encoder->setVisibilityResultMode(MTL::VisibilityResultModeDisabled, 0);
-    //     });
-    //   }
-    // }
     dirty_state.clrAll();
     if (cmdbuf_state == CommandBufferState::TessellationRenderPipelineReady) {
       return UploadShaderStageResourceBinding<PipelineStage::Vertex, true>() &&
diff --git a/src/d3d11/d3d11_query.cpp b/src/d3d11/d3d11_query.cpp
index a04fb0a8..ca625cff 100644
--- a/src/d3d11/d3d11_query.cpp
+++ b/src/d3d11/d3d11_query.cpp
@@ -58,6 +58,7 @@ class OcculusionQuery : public MTLD3DQueryBase<IMTLD3DOcclusionQuery> {
       } else {
         *((uint64_t *)data) = accumulated_value;
       }
+      query = new VisibilityResultQuery();
       state = QueryState::Signaled;
       return S_OK;
     }
@@ -73,6 +74,7 @@ class OcculusionQuery : public MTLD3DQueryBase<IMTLD3DOcclusionQuery> {
     if (state == QueryState::Issued) {
       // discard previous issued query
       state = QueryState::Building;
+      query = new VisibilityResultQuery();
       return true;
     }
     // FIXME: it's effectively ignoring  Begin() after Begin()
@@ -83,6 +85,7 @@ class OcculusionQuery : public MTLD3DQueryBase<IMTLD3DOcclusionQuery> {
   End() override {
     if (state == QueryState::Signaled) {
       // ignore  a single End()
+      accumulated_value = 0;
       return false;
     }
     if (state == QueryState::Issued) {
diff --git a/src/dxmt/dxmt_command_queue.hpp b/src/dxmt/dxmt_command_queue.hpp
index 012bf757..53439e4b 100644
--- a/src/dxmt/dxmt_command_queue.hpp
+++ b/src/dxmt/dxmt_command_queue.hpp
@@ -192,10 +192,10 @@ class CommandChunk {
 
   void
   reset() noexcept {
+    visibility_readback = {};
     list_enc.~CommandList();
     cpu_arugment_heap_offset = 0;
     gpu_arugment_heap_offset = 0;
-    visibility_readback = {};
     attached_cmdbuf = nullptr;
   }
 };
diff --git a/src/dxmt/dxmt_context.cpp b/src/dxmt/dxmt_context.cpp
index 67f08b39..2ab8c049 100644
--- a/src/dxmt/dxmt_context.cpp
+++ b/src/dxmt/dxmt_context.cpp
@@ -397,7 +397,7 @@ ArgumentEncodingContext::bumpVisibilityResultOffset() {
     render_encoder->use_visibility_result = 1;
     if (auto offset = vro_state_.getNextWriteOffset(true); offset != ~0uLL)
       encodeRenderCommand([offset](RenderCommandContext &ctx) {
-        ctx.encoder->setVisibilityResultMode(MTL::VisibilityResultModeCounting, offset >> 3);
+        ctx.encoder->setVisibilityResultMode(MTL::VisibilityResultModeCounting, offset << 3);
       });
   } else {
     if (vro_state_.getNextWriteOffset(false) != ~0uLL && render_encoder->use_visibility_result)
@@ -426,7 +426,6 @@ ArgumentEncodingContext::flushCommands(MTL::CommandBuffer *cmdbuf, uint64_t seqI
     assert(encoder_index == encoder_count);
   }
 
-  // TODO: optimize command order
   if (encoder_count > 1) {
     unsigned j, i;
     EncoderData *prev;
diff --git a/src/dxmt/dxmt_occlusion_query.hpp b/src/dxmt/dxmt_occlusion_query.hpp
index 253090a7..e449a7d3 100644
--- a/src/dxmt/dxmt_occlusion_query.hpp
+++ b/src/dxmt/dxmt_occlusion_query.hpp
@@ -115,9 +115,8 @@ class VisibilityResultQuery {
 
   void
   issue(uint64_t seqId, uint64_t const *readbackBuffer, unsigned numResults) {
-    seq_id_issued = seqId;
-    assert(seq_id_issued >= seq_id_begin);
-    assert(seq_id_issued <= seq_id_end);
+    assert(seqId >= seq_id_begin);
+    assert(seqId <= seq_id_end);
     uint64_t const *start = seqId == seq_id_begin ? readbackBuffer + occlusion_counter_begin : readbackBuffer;
     uint64_t const *end = seqId == seq_id_end ? readbackBuffer + occlusion_counter_end : readbackBuffer + numResults;
     assert(start <= end);
@@ -125,6 +124,7 @@ class VisibilityResultQuery {
       accumulated_value_ += *start;
       start++;
     }
+    seq_id_issued = seqId;
   }
 
   bool
@@ -133,16 +133,25 @@ class VisibilityResultQuery {
       *value = accumulated_value_;
       return true;
     }
-    *value = 0;
     return false;
   }
 
+  void
+  reset() {
+    accumulated_value_ = 0;
+    seq_id_begin = ~0uLL;
+    occlusion_counter_begin = ~0uLL;
+    seq_id_end = ~0uLL;
+    occlusion_counter_end = ~0uLL;
+    seq_id_issued = 0;
+  };
+
 private:
   uint64_t accumulated_value_ = 0;
-  uint64_t seq_id_begin = 0;
-  uint64_t occlusion_counter_begin = 0;
-  uint64_t seq_id_end = 0;
-  uint64_t occlusion_counter_end = 0;
+  uint64_t seq_id_begin = ~0uLL;
+  uint64_t occlusion_counter_begin = ~0uLL;
+  uint64_t seq_id_end = ~0uLL;
+  uint64_t occlusion_counter_end = ~0uLL;
   uint64_t seq_id_issued = 0;
   std::atomic<uint32_t> refcount_ = {0u};
 };
@@ -156,7 +165,7 @@ class VisibilityResultReadback {
       seq_id(seq_id),
       num_results(num_results),
       queries(queries),
-      visibility_result_heap(visibility_result_heap) {}
+      visibility_result_heap(std::move(visibility_result_heap)) {}
   ~VisibilityResultReadback() {
     for (auto query : queries) {
       query->issue(seq_id, (uint64_t *)visibility_result_heap->contents(), num_results);