InputCommon: Introducing the "Dynamic Input Texture". Configuration links an emulated input action to an image based on what host key is defined for that emulated input. Specific regions are called out in configuration that mark where to replace an input button with a host key image.

Source/Core/InputCommon/DynamicInputTextureManager.cpp

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+// Copyright 2019 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include "InputCommon/DynamicInputTextureManager.h"
+
+#include <set>
+
+#include "Common/CommonPaths.h"
+#include "Common/FileSearch.h"
+#include "Common/FileUtil.h"
+#include "Core/ConfigManager.h"
+
+#include "InputCommon/DynamicInputTextureConfiguration.h"
+#include "VideoCommon/HiresTextures.h"
+
+namespace InputCommon
+{
+DynamicInputTextureManager::DynamicInputTextureManager() = default;
+
+DynamicInputTextureManager::~DynamicInputTextureManager() = default;
+
+void DynamicInputTextureManager::Load()
+{
+  m_configuration.clear();
+
+  const std::string& game_id = SConfig::GetInstance().GetGameID();
+  const std::set<std::string> dynamic_input_directories =
+      GetTextureDirectoriesWithGameId(File::GetUserPath(D_DYNAMICINPUT_IDX), game_id);
+
+  for (const auto& dynamic_input_directory : dynamic_input_directories)
+  {
+    const auto json_files = Common::DoFileSearch({dynamic_input_directory}, {".json"});
+    for (auto& file : json_files)
+    {
+      m_configuration.emplace_back(file);
+    }
+  }
+}
+
+void DynamicInputTextureManager::GenerateTextures(const IniFile::Section* sec,
+                                                  const std::string& controller_name)
+{
+  for (const auto& configuration : m_configuration)
+  {
+    configuration.GenerateTextures(sec, controller_name);
+  }
+}
+}  // namespace InputCommon