Make the arbitrary mipmap detection threshold configureable

This is likely a "superuser" option at best, but I want to be able to play with
it without rebuilding if I want to tweak the heuristics

3 files changed, 5 insertions, 2 deletions

diff --git a/Source/Core/VideoCommon/TextureCacheBase.cpp b/Source/Core/VideoCommon/TextureCacheBase.cpp
index 00d65c953d..370bdd836b 100644
--- a/Source/Core/VideoCommon/TextureCacheBase.cpp
+++ b/Source/Core/VideoCommon/TextureCacheBase.cpp
@@ -507,7 +507,7 @@ public:
     // expect a normal blurred mipmap to look like and what we actually received
     // 4.5% was chosen because it's just below the lowest clearly-arbitrary texture
     // I found in my tests, the background clouds in Mario Galaxy's Observatory lobby.
-    constexpr auto THRESHOLD_PERCENT = 4.5f;
+    const auto threshold = g_ActiveConfig.fArbitraryMipmapDetectionThreshold;
 
     auto* src = downsample_buffer;
     auto* dst = downsample_buffer + levels[1].shape.row_length * levels[1].shape.height * 4;
@@ -533,7 +533,7 @@ public:
     }
 
     auto all_levels = total_diff / (levels.size() - 1);
-    return all_levels > THRESHOLD_PERCENT;
+    return all_levels > threshold;
   }
 
 private:
diff --git a/Source/Core/VideoCommon/VideoConfig.cpp b/Source/Core/VideoCommon/VideoConfig.cpp
index c7ab81d82b..a0029df1e7 100644
--- a/Source/Core/VideoCommon/VideoConfig.cpp
+++ b/Source/Core/VideoCommon/VideoConfig.cpp
@@ -121,6 +121,8 @@ void VideoConfig::Refresh()
   bForceTrueColor = Config::Get(Config::GFX_ENHANCE_FORCE_TRUE_COLOR);
   bDisableCopyFilter = Config::Get(Config::GFX_ENHANCE_DISABLE_COPY_FILTER);
   bArbitraryMipmapDetection = Config::Get(Config::GFX_ENHANCE_ARBITRARY_MIPMAP_DETECTION);
+  fArbitraryMipmapDetectionThreshold =
+      Config::Get(Config::GFX_ENHANCE_ARBITRARY_MIPMAP_DETECTION_THRESHOLD);
 
   stereo_mode = Config::Get(Config::GFX_STEREO_MODE);
   iStereoDepth = Config::Get(Config::GFX_STEREO_DEPTH);
diff --git a/Source/Core/VideoCommon/VideoConfig.h b/Source/Core/VideoCommon/VideoConfig.h
index faebb31f70..97d6429133 100644
--- a/Source/Core/VideoCommon/VideoConfig.h
+++ b/Source/Core/VideoCommon/VideoConfig.h
@@ -75,6 +75,7 @@ struct VideoConfig final
   bool bForceTrueColor;
   bool bDisableCopyFilter;
   bool bArbitraryMipmapDetection;
+  float fArbitraryMipmapDetectionThreshold;
 
   // Information
   bool bShowFPS;