From 69839df1eb2a594b81bceb8cfac58ccbba286628 Mon Sep 17 00:00:00 2001
From: iwubcode <iwubcode@users.noreply.github.com>
Date: Tue, 15 Mar 2022 01:46:58 -0500
Subject: [PATCH] VideoCommon: support dynamically updating game mods at
 runtime

---
 Source/Core/VideoCommon/RenderBase.cpp       | 31 ++++++++++++++++++++
 Source/Core/VideoCommon/TextureCacheBase.cpp |  9 +++++-
 Source/Core/VideoCommon/TextureCacheBase.h   |  1 +
 Source/Core/VideoCommon/VideoConfig.h        |  3 ++
 4 files changed, 43 insertions(+), 1 deletion(-)

diff --git a/Source/Core/VideoCommon/RenderBase.cpp b/Source/Core/VideoCommon/RenderBase.cpp
index b13f74542c..412461d409 100644
--- a/Source/Core/VideoCommon/RenderBase.cpp
+++ b/Source/Core/VideoCommon/RenderBase.cpp
@@ -136,6 +136,22 @@ bool Renderer::Initialize()
     return false;
   }
 
+  if (g_ActiveConfig.bGraphicMods)
+  {
+    // If a config change occurred in a previous session,
+    // remember the old change count value.  By setting
+    // our current change count to the old value, we
+    // avoid loading the stale data when we
+    // check for config changes.
+    const u32 old_game_mod_changes = g_ActiveConfig.graphics_mod_config ?
+                                         g_ActiveConfig.graphics_mod_config->GetChangeCount() :
+                                         0;
+    g_ActiveConfig.graphics_mod_config = GraphicsModGroupConfig(SConfig::GetInstance().GetGameID());
+    g_ActiveConfig.graphics_mod_config->Load();
+    g_ActiveConfig.graphics_mod_config->SetChangeCount(old_game_mod_changes);
+    m_graphics_mod_manager.Load(*g_ActiveConfig.graphics_mod_config);
+  }
+
   return true;
 }
 
@@ -466,12 +482,27 @@ void Renderer::CheckForConfigChanges()
   const bool old_force_filtering = g_ActiveConfig.bForceFiltering;
   const bool old_vsync = g_ActiveConfig.bVSyncActive;
   const bool old_bbox = g_ActiveConfig.bBBoxEnable;
+  const u32 old_game_mod_changes =
+      g_ActiveConfig.graphics_mod_config ? g_ActiveConfig.graphics_mod_config->GetChangeCount() : 0;
+  const bool old_graphics_mods_enabled = g_ActiveConfig.bGraphicMods;
 
   UpdateActiveConfig();
   FreeLook::UpdateActiveConfig();
 
   g_freelook_camera.SetControlType(FreeLook::GetActiveConfig().camera_config.control_type);
 
+  if (g_ActiveConfig.bGraphicMods && !old_graphics_mods_enabled)
+  {
+    g_ActiveConfig.graphics_mod_config = GraphicsModGroupConfig(SConfig::GetInstance().GetGameID());
+    g_ActiveConfig.graphics_mod_config->Load();
+  }
+
+  if (g_ActiveConfig.graphics_mod_config &&
+      (old_game_mod_changes != g_ActiveConfig.graphics_mod_config->GetChangeCount()))
+  {
+    m_graphics_mod_manager.Load(*g_ActiveConfig.graphics_mod_config);
+  }
+
   // Update texture cache settings with any changed options.
   g_texture_cache->OnConfigChanged(g_ActiveConfig);
 
diff --git a/Source/Core/VideoCommon/TextureCacheBase.cpp b/Source/Core/VideoCommon/TextureCacheBase.cpp
index 3bd6e2ae52..9bbabb0252 100644
--- a/Source/Core/VideoCommon/TextureCacheBase.cpp
+++ b/Source/Core/VideoCommon/TextureCacheBase.cpp
@@ -154,6 +154,9 @@ void TextureCacheBase::OnConfigChanged(const VideoConfig& config)
     HiresTexture::Update();
   }
 
+  const u32 change_count =
+      config.graphics_mod_config ? config.graphics_mod_config->GetChangeCount() : 0;
+
   // TODO: Invalidating texcache is really stupid in some of these cases
   if (config.iSafeTextureCache_ColorSamples != backup_config.color_samples ||
       config.bTexFmtOverlayEnable != backup_config.texfmt_overlay ||
@@ -161,7 +164,9 @@ void TextureCacheBase::OnConfigChanged(const VideoConfig& config)
       config.bHiresTextures != backup_config.hires_textures ||
       config.bEnableGPUTextureDecoding != backup_config.gpu_texture_decoding ||
       config.bDisableCopyToVRAM != backup_config.disable_vram_copies ||
-      config.bArbitraryMipmapDetection != backup_config.arbitrary_mipmap_detection)
+      config.bArbitraryMipmapDetection != backup_config.arbitrary_mipmap_detection ||
+      config.bGraphicMods != backup_config.graphics_mods ||
+      change_count != backup_config.graphics_mod_change_count)
   {
     Invalidate();
     TexDecoder_SetTexFmtOverlayOptions(config.bTexFmtOverlayEnable, config.bTexFmtOverlayCenter);
@@ -257,6 +262,8 @@ void TextureCacheBase::SetBackupConfig(const VideoConfig& config)
   backup_config.disable_vram_copies = config.bDisableCopyToVRAM;
   backup_config.arbitrary_mipmap_detection = config.bArbitraryMipmapDetection;
   backup_config.graphics_mods = config.bGraphicMods;
+  backup_config.graphics_mod_change_count =
+      config.graphics_mod_config ? config.graphics_mod_config->GetChangeCount() : 0;
 }
 
 TextureCacheBase::TCacheEntry*
diff --git a/Source/Core/VideoCommon/TextureCacheBase.h b/Source/Core/VideoCommon/TextureCacheBase.h
index 61cc612eed..287f3b840f 100644
--- a/Source/Core/VideoCommon/TextureCacheBase.h
+++ b/Source/Core/VideoCommon/TextureCacheBase.h
@@ -378,6 +378,7 @@ private:
     bool disable_vram_copies;
     bool arbitrary_mipmap_detection;
     bool graphics_mods;
+    u32 graphics_mod_change_count;
   };
   BackupConfig backup_config = {};
 
diff --git a/Source/Core/VideoCommon/VideoConfig.h b/Source/Core/VideoCommon/VideoConfig.h
index 7be25a6d88..6ce7bed379 100644
--- a/Source/Core/VideoCommon/VideoConfig.h
+++ b/Source/Core/VideoCommon/VideoConfig.h
@@ -9,10 +9,12 @@
 
 #pragma once
 
+#include <optional>
 #include <string>
 #include <vector>
 
 #include "Common/CommonTypes.h"
+#include "VideoCommon/GraphicsModSystem/Config/GraphicsModGroup.h"
 #include "VideoCommon/VideoCommon.h"
 
 // Log in two categories, and save three other options in the same byte
@@ -112,6 +114,7 @@ struct VideoConfig final
   bool bEnableGPUTextureDecoding = false;
   int iBitrateKbps = 0;
   bool bGraphicMods = false;
+  std::optional<GraphicsModGroupConfig> graphics_mod_config;
 
   // Hacks
   bool bEFBAccessEnable = false;