From f5bd7c9b954f3c206074e21faa724aff9b277e95 Mon Sep 17 00:00:00 2001
From: Allusive <154700875+AllusiveWheat@users.noreply.github.com>
Date: Sat, 8 Nov 2025 18:12:57 -0800
Subject: [PATCH] Add model reloading (#872)

* Make async call does not cause a crash if the script vm gets deleted before call finishes.

* also fix in call since it still tries to call even if sqvm is invalid.

* Update log string to account for not crashing anymore

* small formatting things

* fix formatting

* Replace sprintf usage with sprintf_s in version.cpp

* Actually check for size of version.

* fix format

* Add model reloading

* fix formatting

* fix cmake format

* update the help string

* Update location in cmake file

* add changes from review

* small update
---
 primedev/Northstar.cmake   |  1 +
 primedev/engine/models.cpp | 24 ++++++++++++++++++++++++
 2 files changed, 25 insertions(+)
 create mode 100644 primedev/engine/models.cpp

diff --git a/primedev/Northstar.cmake b/primedev/Northstar.cmake
index c64b0bc7..bc73a700 100644
--- a/primedev/Northstar.cmake
+++ b/primedev/Northstar.cmake
@@ -65,6 +65,7 @@ add_library(
     "engine/host.cpp"
     "engine/hoststate.cpp"
     "engine/hoststate.h"
+    "engine/models.cpp"
     "engine/r2engine.cpp"
     "engine/r2engine.h"
     "engine/runframe.cpp"
diff --git a/primedev/engine/models.cpp b/primedev/engine/models.cpp
new file mode 100644
index 00000000..51141381
--- /dev/null
+++ b/primedev/engine/models.cpp
@@ -0,0 +1,24 @@
+static void (*Studio_ReloadModels)(__int64 a1, unsigned int a2) = nullptr;
+static uintptr_t model_loader;
+static uint8_t* g_VpkMode;
+
+void ConCommand_reload_models(const CCommand& args)
+{
+	uint8_t prevVpkMode = *g_VpkMode;
+	*g_VpkMode = 0; // need to set to zero to disable file cache temporarily
+	Studio_ReloadModels(model_loader, 2);
+	*g_VpkMode = prevVpkMode;
+};
+
+ON_DLL_LOAD("filesystem_stdio.dll", FileSystemModels, (CModule module))
+{
+	g_VpkMode = module.Offset(0xe5aa9).RCast<uint8_t*>();
+}
+
+ON_DLL_LOAD_CLIENT_RELIESON("engine.dll", EngineModels, ConCommand, (CModule module))
+{
+	model_loader = module.Offset(0x7c4c20);
+	module.Offset(0xCF024).Patch({0xEB, 0x0E});
+	Studio_ReloadModels = module.Offset(0xCEEF0).RCast<decltype(Studio_ReloadModels)>();
+	RegisterConCommand("reload_models", ConCommand_reload_models, "reload all models", FCVAR_CLIENTDLL);
+}