diff --git a/Source/Core/InputCommon/DynamicInputTextureConfiguration.cpp b/Source/Core/InputCommon/DynamicInputTextureConfiguration.cpp
diff --git a/Source/Core/InputCommon/DynamicInputTextureConfiguration.h b/Source/Core/InputCommon/DynamicInputTextureConfiguration.h
diff --git a/Source/Core/InputCommon/DynamicInputTextureManager.cpp b/Source/Core/InputCommon/DynamicInputTextureManager.cpp
@@ -12,7 +12,7 @@
 #include "Core/ConfigManager.h"
 #include "Core/Core.h"
 
-#include "InputCommon/DynamicInputTextureConfiguration.h"
+#include "InputCommon/DynamicInputTextures/DITConfiguration.h"
 #include "VideoCommon/HiresTextures.h"
 #include "VideoCommon/RenderBase.h"
 

diff --git a/Source/Core/InputCommon/DynamicInputTextureManager.h b/Source/Core/InputCommon/DynamicInputTextureManager.h
@@ -11,7 +11,10 @@
 
 namespace InputCommon
 {
-class DynamicInputTextureConfiguration;
+namespace DynamicInputTextures
+{
+class Configuration;
+}
 class DynamicInputTextureManager
 {
 public:
@@ -21,7 +24,7 @@ class DynamicInputTextureManager
   void GenerateTextures(const IniFile::Section* sec, const std::string& controller_name);
 
 private:
-  std::vector<DynamicInputTextureConfiguration> m_configuration;
+  std::vector<DynamicInputTextures::Configuration> m_configuration;
   std::string m_config_type;
 };
 }  // namespace InputCommon
diff --git a/Source/Core/InputCommon/DynamicInputTextures/DITConfiguration.cpp b/Source/Core/InputCommon/DynamicInputTextures/DITConfiguration.cpp
@@ -0,0 +1,221 @@
+// Copyright 2019 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include "InputCommon/DynamicInputTextures/DITConfiguration.h"
+
+#include <optional>
+#include <sstream>
+#include <string>
+
+#include <picojson.h>
+
+#include "Common/CommonPaths.h"
+#include "Common/FileUtil.h"
+#include "Common/Logging/Log.h"
+#include "Common/StringUtil.h"
+#include "Core/ConfigManager.h"
+#include "InputCommon/ControllerEmu/ControllerEmu.h"
+#include "InputCommon/DynamicInputTextures/DITSpecification.h"
+#include "InputCommon/ImageOperations.h"
+
+namespace
+{
+std::string GetStreamAsString(std::ifstream& stream)
+{
+  std::stringstream ss;
+  ss << stream.rdbuf();
+  return ss.str();
+}
+}  // namespace
+
+namespace InputCommon::DynamicInputTextures
+{
+Configuration::Configuration(const std::string& json_file)
+{
+  std::ifstream json_stream;
+  File::OpenFStream(json_stream, json_file, std::ios_base::in);
+  if (!json_stream.is_open())
+  {
+    ERROR_LOG_FMT(VIDEO, "Failed to load dynamic input json file '{}'", json_file);
+    m_valid = false;
+    return;
+  }
+
+  picojson::value root;
+  const auto error = picojson::parse(root, GetStreamAsString(json_stream));
+
+  if (!error.empty())
+  {
+    ERROR_LOG_FMT(VIDEO, "Failed to load dynamic input json file '{}' due to parse error: {}",
+                  json_file, error);
+    m_valid = false;
+    return;
+  }
+
+  SplitPath(json_file, &m_base_path, nullptr, nullptr);
+
+  const picojson::value& specification_json = root.get("specification");
+  u8 specification = 1;
+  if (specification_json.is<double>())
+  {
+    const double spec_from_json = specification_json.get<double>();
+    if (spec_from_json < static_cast<double>(std::numeric_limits<u8>::min()) ||
+        spec_from_json > static_cast<double>(std::numeric_limits<u8>::max()))
+    {
+      ERROR_LOG_FMT(
+          VIDEO,
+          "Failed to load dynamic input json file '{}', specification '{}' is not within bounds",
+          json_file, spec_from_json);
+      m_valid = false;
+      return;
+    }
+    specification = static_cast<u8>(spec_from_json);
+  }
+
+  if (specification != 1)
+  {
+    ERROR_LOG_FMT(VIDEO,
+                  "Failed to load dynamic input json file '{}', specification '{}' is invalid",
+                  json_file, specification);
+    m_valid = false;
+    return;
+  }
+
+  m_valid = ProcessSpecificationV1(root, m_dynamic_input_textures, m_base_path, json_file);
+}
+
+Configuration::~Configuration() = default;
+
+bool Configuration::GenerateTextures(const IniFile::Section* sec,
+                                     const std::string& controller_name) const
+{
+  bool any_dirty = false;
+  for (const auto& texture_data : m_dynamic_input_textures)
+  {
+    any_dirty |= GenerateTexture(sec, controller_name, texture_data);
+  }
+
+  return any_dirty;
+}
+
+bool Configuration::GenerateTexture(const IniFile::Section* sec, const std::string& controller_name,
+                                    const Data& texture_data) const
+{
+  std::string device_name;
+  if (!sec->Get("Device", &device_name))
+  {
+    return false;
+  }
+
+  auto emulated_controls_iter = texture_data.m_emulated_controllers.find(controller_name);
+  if (emulated_controls_iter == texture_data.m_emulated_controllers.end())
+  {
+    return false;
+  }
+
+  bool device_found = true;
+  auto host_devices_iter = texture_data.m_host_devices.find(device_name);
+  if (host_devices_iter == texture_data.m_host_devices.end())
+  {
+    // If we fail to find our exact device,
+    // it's possible the creator doesn't care (single player game)
+    // and has used a wildcard for any device
+    host_devices_iter = texture_data.m_host_devices.find("");
+
+    if (host_devices_iter == texture_data.m_host_devices.end())
+    {
+      device_found = false;
+    }
+  }
+
+  // Two copies of the loaded texture
+  // The first one is used as a fallback if a key or device isn't mapped
+  // the second one is used as the final image to write to the textures directory
+  const auto original_image = LoadImage(m_base_path + texture_data.m_image_name);
+  auto image_to_write = original_image;
+
+  bool dirty = false;
+  for (auto& [emulated_key, rects] : emulated_controls_iter->second)
+  {
+    // TODO: Remove this line when we move to C++20
+    auto& rects_ref = rects;
+    auto apply_original = [&] {
+      for (const auto& rect : rects_ref)
+      {
+        CopyImageRegion(*original_image, *image_to_write, rect, rect);
+        dirty = true;
+      }
+    };
+
+    if (!device_found)
+    {
+      // If we get here, that means the controller is set to a
+      // device not exposed to the pack
+      // We still apply the original image, in case the user
+      // switched devices and wants to see the changes
+      apply_original();
+      continue;
+    }
+
+    std::string host_key;
+    sec->Get(emulated_key, &host_key);
+
+    const auto input_image_iter = host_devices_iter->second.find(host_key);
+    if (input_image_iter == host_devices_iter->second.end())
+    {
+      apply_original();
+    }
+    else
+    {
+      const auto host_key_image = LoadImage(m_base_path + input_image_iter->second);
+
+      for (const auto& rect : rects)
+      {
+        InputCommon::ImagePixelData pixel_data;
+        if (host_key_image->width == rect.GetWidth() && host_key_image->height == rect.GetHeight())
+        {
+          pixel_data = *host_key_image;
+        }
+        else if (texture_data.m_preserve_aspect_ratio)
+        {
+          pixel_data = ResizeKeepAspectRatio(ResizeMode::Nearest, *host_key_image, rect.GetWidth(),
+                                             rect.GetHeight(), Pixel{0, 0, 0, 0});
+        }
+        else
+        {
+          pixel_data =
+              Resize(ResizeMode::Nearest, *host_key_image, rect.GetWidth(), rect.GetHeight());
+        }
+
+        CopyImageRegion(pixel_data, *image_to_write, Rect{0, 0, rect.GetWidth(), rect.GetHeight()},
+                        rect);
+        dirty = true;
+      }
+    }
+  }
+
+  if (dirty)
+  {
+    const std::string& game_id = SConfig::GetInstance().GetGameID();
+    const auto hi_res_folder =
+        File::GetUserPath(D_HIRESTEXTURES_IDX) + texture_data.m_generated_folder_name;
+    if (!File::IsDirectory(hi_res_folder))
+    {
+      File::CreateDir(hi_res_folder);
+    }
+    WriteImage(hi_res_folder + DIR_SEP + texture_data.m_hires_texture_name, *image_to_write);
+
+    const auto game_id_folder = hi_res_folder + DIR_SEP + "gameids";
+    if (!File::IsDirectory(game_id_folder))
+    {
+      File::CreateDir(game_id_folder);
+    }
+    File::CreateEmptyFile(game_id_folder + DIR_SEP + game_id + ".txt");
+
+    return true;
+  }
+
+  return false;
+}
+}  // namespace InputCommon::DynamicInputTextures
diff --git a/Source/Core/InputCommon/DynamicInputTextures/DITConfiguration.h b/Source/Core/InputCommon/DynamicInputTextures/DITConfiguration.h
@@ -0,0 +1,32 @@
+// Copyright 2019 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <string>
+#include <unordered_map>
+#include <vector>
+
+#include "Common/CommonTypes.h"
+#include "Common/IniFile.h"
+#include "InputCommon/DynamicInputTextures/DITData.h"
+
+namespace InputCommon::DynamicInputTextures
+{
+class Configuration
+{
+public:
+  explicit Configuration(const std::string& json_file);
+  ~Configuration();
+  bool GenerateTextures(const IniFile::Section* sec, const std::string& controller_name) const;
+
+private:
+  bool GenerateTexture(const IniFile::Section* sec, const std::string& controller_name,
+                       const Data& texture_data) const;
+
+  std::vector<Data> m_dynamic_input_textures;
+  std::string m_base_path;
+  bool m_valid = true;
+};
+}  // namespace InputCommon::DynamicInputTextures
diff --git a/Source/Core/InputCommon/DynamicInputTextures/DITData.h b/Source/Core/InputCommon/DynamicInputTextures/DITData.h
@@ -0,0 +1,28 @@
+// Copyright 2021 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <string>
+#include <unordered_map>
+#include <vector>
+
+#include "InputCommon/ImageOperations.h"
+
+namespace InputCommon::DynamicInputTextures
+{
+struct Data
+{
+  std::string m_image_name;
+  std::string m_hires_texture_name;
+  std::string m_generated_folder_name;
+
+  using EmulatedKeyToRegionsMap = std::unordered_map<std::string, std::vector<Rect>>;
+  std::unordered_map<std::string, EmulatedKeyToRegionsMap> m_emulated_controllers;
+
+  using HostKeyToImagePath = std::unordered_map<std::string, std::string>;
+  std::unordered_map<std::string, HostKeyToImagePath> m_host_devices;
+  bool m_preserve_aspect_ratio = true;
+};
+}  // namespace InputCommon::DynamicInputTextures
diff --git a/Source/Core/InputCommon/DynamicInputTextures/DITSpecification.cpp b/Source/Core/InputCommon/DynamicInputTextures/DITSpecification.cpp
@@ -0,0 +1,201 @@
+// Copyright 2021 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include "InputCommon/DynamicInputTextures/DITSpecification.h"
+
+#include <fmt/format.h>
+
+#include "Common/FileUtil.h"
+#include "Common/IOFile.h"
+#include "Common/Logging/Log.h"
+#include "Core/ConfigManager.h"
+
+namespace InputCommon::DynamicInputTextures
+{
+bool ProcessSpecificationV1(picojson::value& root, std::vector<Data>& input_textures,
+                            const std::string& base_path, const std::string& json_file)
+{
+  const picojson::value& output_textures_json = root.get("output_textures");
+  if (!output_textures_json.is<picojson::object>())
+  {
+    ERROR_LOG_FMT(
+        VIDEO,
+        "Failed to load dynamic input json file '{}' because 'output_textures' is missing or "
+        "was not of type object",
+        json_file);
+    return false;
+  }
+
+  const picojson::value& preserve_aspect_ratio_json = root.get("preserve_aspect_ratio");
+
+  bool preserve_aspect_ratio = true;
+  if (preserve_aspect_ratio_json.is<bool>())
+  {
+    preserve_aspect_ratio = preserve_aspect_ratio_json.get<bool>();
+  }
+
+  const picojson::value& generated_folder_name_json = root.get("generated_folder_name");
+
+  const std::string& game_id = SConfig::GetInstance().GetGameID();
+  std::string generated_folder_name = fmt::format("{}_Generated", game_id);
+  if (generated_folder_name_json.is<std::string>())
+  {
+    generated_folder_name = generated_folder_name_json.get<std::string>();
+  }
+
+  const picojson::value& default_host_controls_json = root.get("default_host_controls");
+  picojson::object default_host_controls;
+  if (default_host_controls_json.is<picojson::object>())
+  {
+    default_host_controls = default_host_controls_json.get<picojson::object>();
+  }
+
+  const auto output_textures = output_textures_json.get<picojson::object>();
+  for (auto& [name, data] : output_textures)
+  {
+    Data texture_data;
+    texture_data.m_hires_texture_name = name;
+
+    // Required fields
+    const picojson::value& image = data.get("image");
+    const picojson::value& emulated_controls = data.get("emulated_controls");
+
+    if (!image.is<std::string>() || !emulated_controls.is<picojson::object>())
+    {
+      ERROR_LOG_FMT(VIDEO,
+                    "Failed to load dynamic input json file '{}' because required fields "
+                    "'image', or 'emulated_controls' are either "
+                    "missing or the incorrect type",
+                    json_file);
+      return false;
+    }
+
+    texture_data.m_image_name = image.to_str();
+    texture_data.m_preserve_aspect_ratio = preserve_aspect_ratio;
+    texture_data.m_generated_folder_name = generated_folder_name;
+
+    const std::string image_full_path = base_path + texture_data.m_image_name;
+    if (!File::Exists(image_full_path))
+    {
+      ERROR_LOG_FMT(VIDEO,
+                    "Failed to load dynamic input json file '{}' because the image '{}' "
+                    "could not be loaded",
+                    json_file, image_full_path);
+      return false;
+    }
+
+    const auto& emulated_controls_json = emulated_controls.get<picojson::object>();
+    for (auto& [emulated_controller_name, map] : emulated_controls_json)
+    {
+      if (!map.is<picojson::object>())
+      {
+        ERROR_LOG_FMT(VIDEO,
+                      "Failed to load dynamic input json file '{}' because 'emulated_controls' "
+                      "map key '{}' is incorrect type.  Expected map  ",
+                      json_file, emulated_controller_name);
+        return false;
+      }
+
+      auto& key_to_regions = texture_data.m_emulated_controllers[emulated_controller_name];
+      for (auto& [emulated_control, regions_array] : map.get<picojson::object>())
+      {
+        if (!regions_array.is<picojson::array>())
+        {
+          ERROR_LOG_FMT(
+              VIDEO,
+              "Failed to load dynamic input json file '{}' because emulated controller '{}' "
+              "key '{}' has incorrect value type.  Expected array ",
+              json_file, emulated_controller_name, emulated_control);
+          return false;
+        }
+
+        std::vector<Rect> region_rects;
+        for (auto& region : regions_array.get<picojson::array>())
+        {
+          Rect r;
+          if (!region.is<picojson::array>())
+          {
+            ERROR_LOG_FMT(
+                VIDEO,
+                "Failed to load dynamic input json file '{}' because emulated controller '{}' "
+                "key '{}' has a region with the incorrect type.  Expected array ",
+                json_file, emulated_controller_name, emulated_control);
+            return false;
+          }
+
+          auto region_offsets = region.get<picojson::array>();
+
+          if (region_offsets.size() != 4)
+          {
+            ERROR_LOG_FMT(
+                VIDEO,
+                "Failed to load dynamic input json file '{}' because emulated controller '{}' "
+                "key '{}' has a region that does not have 4 offsets (left, top, right, "
+                "bottom).",
+                json_file, emulated_controller_name, emulated_control);
+            return false;
+          }
+
+          if (!std::all_of(region_offsets.begin(), region_offsets.end(),
+                           [](picojson::value val) { return val.is<double>(); }))
+          {
+            ERROR_LOG_FMT(
+                VIDEO,
+                "Failed to load dynamic input json file '{}' because emulated controller '{}' "
+                "key '{}' has a region that has the incorrect offset type.",
+                json_file, emulated_controller_name, emulated_control);
+            return false;
+          }
+
+          r.left = static_cast<u32>(region_offsets[0].get<double>());
+          r.top = static_cast<u32>(region_offsets[1].get<double>());
+          r.right = static_cast<u32>(region_offsets[2].get<double>());
+          r.bottom = static_cast<u32>(region_offsets[3].get<double>());
+          region_rects.push_back(r);
+        }
+        key_to_regions.insert_or_assign(emulated_control, std::move(region_rects));
+      }
+    }
+
+    // Default to the default controls but overwrite if the creator
+    // has provided something specific
+    picojson::object host_controls = default_host_controls;
+    const picojson::value& host_controls_json = data.get("host_controls");
+    if (host_controls_json.is<picojson::object>())
+    {
+      host_controls = host_controls_json.get<picojson::object>();
+    }
+
+    if (host_controls.empty())
+    {
+      ERROR_LOG_FMT(VIDEO,
+                    "Failed to load dynamic input json file '{}' because field "
+                    "'host_controls' is missing ",
+                    json_file);
+      return false;
+    }
+
+    for (auto& [host_device, map] : host_controls)
+    {
+      if (!map.is<picojson::object>())
+      {
+        ERROR_LOG_FMT(VIDEO,
+                      "Failed to load dynamic input json file '{}' because 'host_controls' "
+                      "map key '{}' is incorrect type ",
+                      json_file, host_device);
+        return false;
+      }
+      auto& host_control_to_imagename = texture_data.m_host_devices[host_device];
+      for (auto& [host_control, image_name] : map.get<picojson::object>())
+      {
+        host_control_to_imagename.insert_or_assign(host_control, image_name.to_str());
+      }
+    }
+
+    input_textures.emplace_back(std::move(texture_data));
+  }
+
+  return true;
+}
+}  // namespace InputCommon::DynamicInputTextures
diff --git a/Source/Core/InputCommon/DynamicInputTextures/DITSpecification.h b/Source/Core/InputCommon/DynamicInputTextures/DITSpecification.h
@@ -0,0 +1,18 @@
+// Copyright 2021 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <string>
+#include <vector>
+
+#include <picojson.h>
+
+#include "InputCommon/DynamicInputTextures/DITData.h"
+
+namespace InputCommon::DynamicInputTextures
+{
+bool ProcessSpecificationV1(picojson::value& root, std::vector<Data>& input_textures,
+                            const std::string& base_path, const std::string& json_file);
+}