VideoCommon: add logic to handle a GraphicsMod while Dolphin is running

Source/Core/VideoCommon/GraphicsModSystem/Runtime/FBInfo.h

@@ -0,0 +1,25 @@
+// Copyright 2022 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "Common/CommonTypes.h"
+#include "VideoCommon/TextureDecoder.h"
+
+struct FBInfo
+{
+  u32 m_height = 0;
+  u32 m_width = 0;
+  TextureFormat m_texture_format = TextureFormat::I4;
+  u32 CalculateHash() const;
+  bool operator==(const FBInfo& other) const;
+  bool operator!=(const FBInfo& other) const;
+};
+
+struct FBInfoHasher
+{
+  std::size_t operator()(const FBInfo& fb_info) const noexcept
+  {
+    return static_cast<std::size_t>(fb_info.CalculateHash());
+  }
+};