Repo created

libs/drape/attribute_buffer_mutator.hpp

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+#pragma once
+
+#include "drape/binding_info.hpp"
+#include "drape/pointers.hpp"
+
+#include "base/shared_buffer_manager.hpp"
+
+#include <cstdint>
+#include <map>
+#include <utility>
+#include <vector>
+
+namespace dp
+{
+struct MutateRegion
+{
+  MutateRegion() : m_offset(0), m_count(0) {}
+  MutateRegion(uint32_t offset, uint32_t count) : m_offset(offset), m_count(count) {}
+
+  uint32_t m_offset;  // Offset from buffer begin in "Elements" not in bytes.
+  uint32_t m_count;   // Count of "Elements".
+};
+
+struct MutateNode
+{
+  MutateRegion m_region;
+  ref_ptr<void> m_data;
+};
+
+class AttributeBufferMutator
+{
+  using TBufferNode = std::pair<SharedBufferManager::shared_buffer_ptr_t, size_t>;
+  using TBufferArray = std::vector<TBufferNode>;
+  using TMutateNodes = std::vector<MutateNode>;
+  using TMutateData = std::map<BindingInfo, TMutateNodes>;
+
+public:
+  ~AttributeBufferMutator();
+  void AddMutation(BindingInfo const & info, MutateNode const & node);
+  void * AllocateMutationBuffer(size_t byteCount);
+
+private:
+  friend class VertexArrayBuffer;
+  TMutateData const & GetMutateData() const { return m_data; }
+
+  TMutateData m_data;
+  TBufferArray m_array;
+};
+}  // namespace dp