VideoCommon: add functionality to prepare for a mesh asset that is loaded from a GLTF file

Source/Core/DolphinLib.props

@@ -656,6 +656,7 @@
     <ClInclude Include="VideoCommon\Assets\CustomTextureData.h" />
     <ClInclude Include="VideoCommon\Assets\DirectFilesystemAssetLibrary.h" />
     <ClInclude Include="VideoCommon\Assets\MaterialAsset.h" />
+    <ClInclude Include="VideoCommon\Assets\MeshAsset.h" />
     <ClInclude Include="VideoCommon\Assets\ShaderAsset.h" />
     <ClInclude Include="VideoCommon\Assets\TextureAsset.h" />
     <ClInclude Include="VideoCommon\AsyncRequests.h" />
@@ -1293,6 +1294,7 @@
     <ClCompile Include="VideoCommon\Assets\CustomTextureData.cpp" />
     <ClCompile Include="VideoCommon\Assets\DirectFilesystemAssetLibrary.cpp" />
     <ClCompile Include="VideoCommon\Assets\MaterialAsset.cpp" />
+    <ClCompile Include="VideoCommon\Assets\MeshAsset.cpp" />
     <ClCompile Include="VideoCommon\Assets\ShaderAsset.cpp" />
     <ClCompile Include="VideoCommon\Assets\TextureAsset.cpp" />
     <ClCompile Include="VideoCommon\AsyncRequests.cpp" />

Source/Core/VideoCommon/Assets/MeshAsset.h

@@ -0,0 +1,60 @@
+// Copyright 2023 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <map>
+#include <memory>
+#include <span>
+#include <string>
+#include <string_view>
+
+#include <picojson.h>
+
+#include "Common/CommonTypes.h"
+#include "Common/Matrix.h"
+
+#include "VideoCommon/Assets/CustomAsset.h"
+#include "VideoCommon/NativeVertexFormat.h"
+#include "VideoCommon/RenderState.h"
+
+namespace File
+{
+class IOFile;
+}
+
+namespace VideoCommon
+{
+struct MeshDataChunk
+{
+  std::unique_ptr<u8[]> vertex_data;
+  u32 vertex_stride;
+  u32 num_vertices;
+  std::unique_ptr<u16[]> indices;
+  u32 num_indices;
+  PortableVertexDeclaration vertex_declaration;
+  PrimitiveType primitive_type;
+  u32 components_available;
+  Common::Vec3 minimum_position;
+  Common::Vec3 maximum_position;
+  Common::Matrix44 transform;
+  std::string material_name;
+};
+
+struct MeshData
+{
+  static bool FromJson(const CustomAssetLibrary::AssetID& asset_id, const picojson::object& json,
+                       MeshData* data);
+  static void ToJson(picojson::object& obj, const MeshData& data);
+
+  static bool FromDolphinMesh(std::span<const u8> raw_data, MeshData* data);
+
+  static bool ToDolphinMesh(File::IOFile* file_data, const MeshData& data);
+
+  static bool FromGLTF(std::string_view gltf_file, MeshData* data);
+
+  std::vector<MeshDataChunk> m_mesh_chunks;
+  std::map<std::string, CustomAssetLibrary::AssetID, std::less<>>
+      m_mesh_material_to_material_asset_id;
+};
+}  // namespace VideoCommon

Source/Core/VideoCommon/CMakeLists.txt

@@ -20,6 +20,8 @@ add_library(videocommon
   Assets/DirectFilesystemAssetLibrary.h
   Assets/MaterialAsset.cpp
   Assets/MaterialAsset.h
+  Assets/MeshAsset.cpp
+  Assets/MeshAsset.h
   Assets/ShaderAsset.cpp
   Assets/ShaderAsset.h
   Assets/TextureAsset.cpp
@@ -216,6 +218,7 @@ PRIVATE
   imgui
   implot
   glslang
+  tinygltf
 )
 
 if(_M_X86_64)