From aaad0c2b2089acd434892e582e5d8f1078a587e1 Mon Sep 17 00:00:00 2001
From: wareya <wareya@gmail.com>
Date: Fri, 11 Jul 2025 11:40:50 -0400
Subject: [PATCH] texture reload debug command

---
 apps/openmw/mwlua/debugbindings.cpp  |  8 +++++++
 components/resource/imagemanager.cpp | 33 +++++++++++++++++++++++-----
 components/resource/imagemanager.hpp |  3 +++
 3 files changed, 38 insertions(+), 6 deletions(-)

diff --git a/apps/openmw/mwlua/debugbindings.cpp b/apps/openmw/mwlua/debugbindings.cpp
index dcb77580ce..cdafef9a72 100644
--- a/apps/openmw/mwlua/debugbindings.cpp
+++ b/apps/openmw/mwlua/debugbindings.cpp
@@ -10,6 +10,7 @@
 #include "../mwrender/postprocessor.hpp"
 #include "../mwrender/renderingmanager.hpp"
 
+#include <components/resource/imagemanager.hpp>
 #include <components/resource/resourcesystem.hpp>
 #include <components/resource/scenemanager.hpp>
 #include <components/shader/shadermanager.hpp>
@@ -82,6 +83,13 @@ namespace MWLua
             });
         };
 
+        api["triggerTextureReload"] = [context]() {
+            context.mLuaManager->addAction([] {
+                auto imageManager = MWBase::Environment::get().getResourceSystem()->getImageManager();
+                imageManager->attemptGlobalReload();
+            });
+        };
+
         api["setShaderHotReloadEnabled"] = [context](bool value) {
             context.mLuaManager->addAction([value] {
                 auto world = MWBase::Environment::get().getWorld();
diff --git a/components/resource/imagemanager.cpp b/components/resource/imagemanager.cpp
index b7a19b4d52..0b480936d1 100644
--- a/components/resource/imagemanager.cpp
+++ b/components/resource/imagemanager.cpp
@@ -85,12 +85,39 @@ namespace Resource
         return true;
     }
 
+    void ImageManager::attemptGlobalReload()
+    {
+        mCache->call([&](std::string name, osg::Object* obj) {
+            auto image = performLoad(VFS::Path::NormalizedView(name.data()));
+            image->swap(*static_cast<osg::Image*>(obj));
+            static_cast<osg::Image*>(obj)->dirty();
+        });
+    }
+
     osg::ref_ptr<osg::Image> ImageManager::getImage(VFS::Path::NormalizedView path, bool disableFlip)
     {
         osg::ref_ptr<osg::Object> obj = mCache->getRefFromObjectCache(path);
         if (obj)
             return osg::ref_ptr<osg::Image>(static_cast<osg::Image*>(obj.get()));
         else
+        {
+            auto image = performLoad(path, disableFlip);
+            // Duplicate the image we got if it's the warning image, so that we can't thrash it
+            if (image == mWarningImage)
+            {
+                // The warning image is like 8x8 so it's not really a problem to deeply clone it.
+                // We want each usage to have its own osg::Image so that assigning into the cache is safe.
+                auto cloned = mWarningImage.get()->clone(osg::CopyOp(osg::CopyOp::Options::DEEP_COPY_ALL));
+                image = static_cast<osg::Image*>(cloned); // constructs a ref_ptr during assignment
+            }
+            mCache->addEntryToObjectCache(path.value(), image);
+            return image;
+        }
+    }
+
+    osg::ref_ptr<osg::Image> ImageManager::performLoad(VFS::Path::NormalizedView path, bool disableFlip)
+    {
+        if (true) // for diff reduction indentation
         {
             Files::IStreamPtr stream;
             try
@@ -100,7 +127,6 @@ namespace Resource
             catch (std::exception& e)
             {
                 Log(Debug::Error) << "Failed to open image: " << e.what();
-                mCache->addEntryToObjectCache(path.value(), mWarningImage);
                 return mWarningImage;
             }
 
@@ -109,7 +135,6 @@ namespace Resource
             if (!reader)
             {
                 Log(Debug::Error) << "Error loading " << path << ": no readerwriter for '" << ext << "' found";
-                mCache->addEntryToObjectCache(path.value(), mWarningImage);
                 return mWarningImage;
             }
 
@@ -122,7 +147,6 @@ namespace Resource
                 if (stream->gcount() != 18)
                 {
                     Log(Debug::Error) << "Error loading " << path << ": couldn't read TGA header";
-                    mCache->addEntryToObjectCache(path.value(), mWarningImage);
                     return mWarningImage;
                 }
                 int type = header[2];
@@ -142,7 +166,6 @@ namespace Resource
             {
                 Log(Debug::Error) << "Error loading " << path << ": " << result.message() << " code "
                                   << result.status();
-                mCache->addEntryToObjectCache(path.value(), mWarningImage);
                 return mWarningImage;
             }
 
@@ -155,7 +178,6 @@ namespace Resource
                 if (!uncompress)
                 {
                     Log(Debug::Error) << "Error loading " << path << ": no S3TC texture compression support installed";
-                    mCache->addEntryToObjectCache(path.value(), mWarningImage);
                     return mWarningImage;
                 }
                 else
@@ -186,7 +208,6 @@ namespace Resource
                 image = newImage;
             }
 
-            mCache->addEntryToObjectCache(path.value(), image);
             return image;
         }
     }
diff --git a/components/resource/imagemanager.hpp b/components/resource/imagemanager.hpp
index ead55c792a..c0692f2da6 100644
--- a/components/resource/imagemanager.hpp
+++ b/components/resource/imagemanager.hpp
@@ -33,6 +33,8 @@ namespace Resource
 
         void reportStats(unsigned int frameNumber, osg::Stats* stats) const override;
 
+        void attemptGlobalReload();
+
     private:
         osg::ref_ptr<osg::Image> mWarningImage;
         osg::ref_ptr<osgDB::Options> mOptions;
@@ -40,6 +42,7 @@ namespace Resource
 
         ImageManager(const ImageManager&);
         void operator=(const ImageManager&);
+        osg::ref_ptr<osg::Image> performLoad(VFS::Path::NormalizedView name, bool disableFlip = false);
     };
 
 }