Implement experimental Vulkan backend

Source/Core/VideoBackends/Vulkan/VertexManager.h

@@ -0,0 +1,44 @@
+// Copyright 2016 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <vector>
+
+#include "VideoCommon/VertexManagerBase.h"
+
+namespace Vulkan
+{
+class StateTracker;
+class StreamBuffer;
+
+class VertexManager : public VertexManagerBase
+{
+public:
+  VertexManager();
+  ~VertexManager();
+
+  bool Initialize(StateTracker* state_tracker);
+
+  NativeVertexFormat* CreateNativeVertexFormat(const PortableVertexDeclaration& vtx_decl) override;
+
+protected:
+  void PrepareDrawBuffers(u32 stride);
+  void ResetBuffer(u32 stride) override;
+
+private:
+  void vFlush(bool use_dst_alpha) override;
+
+  StateTracker* m_state_tracker = nullptr;
+
+  std::vector<u8> m_cpu_vertex_buffer;
+  std::vector<u16> m_cpu_index_buffer;
+
+  std::unique_ptr<StreamBuffer> m_vertex_stream_buffer;
+  std::unique_ptr<StreamBuffer> m_index_stream_buffer;
+
+  u32 m_current_draw_base_vertex = 0;
+  u32 m_current_draw_base_index = 0;
+};
+}