Implement D3D12 backend

Source/Core/VideoBackends/D3D12/VertexManager.h

@@ -0,0 +1,52 @@
+// Copyright 2019 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <memory>
+#include "VideoBackends/D3D12/DescriptorHeapManager.h"
+#include "VideoBackends/D3D12/StreamBuffer.h"
+#include "VideoCommon/VertexManagerBase.h"
+
+namespace DX12
+{
+class VertexManager final : public VertexManagerBase
+{
+public:
+  VertexManager();
+  ~VertexManager();
+
+  bool Initialize() override;
+
+  void UploadUtilityUniforms(const void* uniforms, u32 uniforms_size) override;
+  bool UploadTexelBuffer(const void* data, u32 data_size, TexelBufferFormat format,
+                         u32* out_offset) override;
+  bool UploadTexelBuffer(const void* data, u32 data_size, TexelBufferFormat format, u32* out_offset,
+                         const void* palette_data, u32 palette_size,
+                         TexelBufferFormat palette_format, u32* out_palette_offset) override;
+
+protected:
+  void ResetBuffer(u32 vertex_stride) override;
+  void CommitBuffer(u32 num_vertices, u32 vertex_stride, u32 num_indices, u32* out_base_vertex,
+                    u32* out_base_index) override;
+  void UploadUniforms() override;
+
+  void UpdateVertexShaderConstants();
+  void UpdateGeometryShaderConstants();
+  void UpdatePixelShaderConstants();
+
+  // Allocates storage in the uniform buffer of the specified size. If this storage cannot be
+  // allocated immediately, the current command buffer will be submitted and all stage's
+  // constants will be re-uploaded. false will be returned in this case, otherwise true.
+  bool ReserveConstantStorage();
+  void UploadAllConstants();
+
+  StreamBuffer m_vertex_stream_buffer;
+  StreamBuffer m_index_stream_buffer;
+  StreamBuffer m_uniform_stream_buffer;
+  StreamBuffer m_texel_stream_buffer;
+  std::array<DescriptorHandle, NUM_TEXEL_BUFFER_FORMATS> m_texel_buffer_views = {};
+};
+
+}  // namespace DX12