Cache factory function pointers to avoid repeated DLL loads

Author: TheMostDiligent

Graphics/Archiver/interface/ArchiverFactoryLoader.h

@@ -50,7 +50,12 @@ typedef struct IArchiverFactory* (*GetArchiverFactoryType)();
 
 inline GetArchiverFactoryType DILIGENT_GLOBAL_FUNCTION(LoadArchiverFactory)()
 {
-    return (GetArchiverFactoryType)LoadEngineDll("Archiver", "GetArchiverFactory");
+    static GetArchiverFactoryType GetFactoryFunc = NULL;
+    if (GetFactoryFunc == NULL)
+    {
+        GetFactoryFunc = (GetArchiverFactoryType)LoadEngineDll("Archiver", "GetArchiverFactory");
+    }
+    return GetFactoryFunc;
 }
 
 #else

Graphics/GraphicsEngineD3D11/interface/EngineFactoryD3D11.h

@@ -157,7 +157,12 @@ typedef struct IEngineFactoryD3D11* (*GetEngineFactoryD3D11Type)();
 
 inline GetEngineFactoryD3D11Type DILIGENT_GLOBAL_FUNCTION(LoadGraphicsEngineD3D11)()
 {
-    return (GetEngineFactoryD3D11Type)LoadEngineDll("GraphicsEngineD3D11", "GetEngineFactoryD3D11");
+    static GetEngineFactoryD3D11Type GetFactoryFunc = NULL;
+    if (GetFactoryFunc == NULL)
+    {
+        GetFactoryFunc = (GetEngineFactoryD3D11Type)LoadEngineDll("GraphicsEngineD3D11", "GetEngineFactoryD3D11");
+    }
+    return GetFactoryFunc;
 }
 
 #else

Graphics/GraphicsEngineD3D12/interface/EngineFactoryD3D12.h

@@ -193,7 +193,12 @@ typedef struct IEngineFactoryD3D12* (*GetEngineFactoryD3D12Type)();
 
 inline GetEngineFactoryD3D12Type DILIGENT_GLOBAL_FUNCTION(LoadGraphicsEngineD3D12)()
 {
-    return (GetEngineFactoryD3D12Type)LoadEngineDll("GraphicsEngineD3D12", "GetEngineFactoryD3D12");
+    static GetEngineFactoryD3D12Type GetFactoryFunc = NULL;
+    if (GetFactoryFunc == NULL)
+    {
+        GetFactoryFunc = (GetEngineFactoryD3D12Type)LoadEngineDll("GraphicsEngineD3D12", "GetEngineFactoryD3D12");
+    }
+    return GetFactoryFunc;
 }
 
 #else

Graphics/GraphicsEngineOpenGL/interface/EngineFactoryOpenGL.h

@@ -130,7 +130,12 @@ typedef struct IEngineFactoryOpenGL* (*GetEngineFactoryOpenGLType)();
 
 inline GetEngineFactoryOpenGLType DILIGENT_GLOBAL_FUNCTION(LoadGraphicsEngineOpenGL)()
 {
-    return (GetEngineFactoryOpenGLType)LoadEngineDll("GraphicsEngineOpenGL", "GetEngineFactoryOpenGL");
+    static GetEngineFactoryOpenGLType GetFactoryFunc = NULL;
+    if (GetFactoryFunc == NULL)
+    {
+        GetFactoryFunc = (GetEngineFactoryOpenGLType)LoadEngineDll("GraphicsEngineOpenGL", "GetEngineFactoryOpenGL");
+    }
+    return GetFactoryFunc;
 }
 
 #else

Graphics/GraphicsEngineVulkan/interface/EngineFactoryVk.h

@@ -136,7 +136,12 @@ typedef struct IEngineFactoryVk* (*GetEngineFactoryVkType)();
 
 inline GetEngineFactoryVkType DILIGENT_GLOBAL_FUNCTION(LoadGraphicsEngineVk)()
 {
-    return (GetEngineFactoryVkType)LoadEngineDll("GraphicsEngineVk", "GetEngineFactoryVk");
+    static GetEngineFactoryVkType GetFactoryFunc = NULL;
+    if (GetFactoryFunc == NULL)
+    {
+        GetFactoryFunc = (GetEngineFactoryVkType)LoadEngineDll("GraphicsEngineVk", "GetEngineFactoryVk");
+    }
+    return GetFactoryFunc;
 }
 
 #else

Graphics/GraphicsEngineWebGPU/interface/EngineFactoryWebGPU.h

@@ -145,7 +145,12 @@ typedef struct IEngineFactoryWebGPU* (*GetEngineFactoryWebGPUType)();
 
 inline GetEngineFactoryWebGPUType DILIGENT_GLOBAL_FUNCTION(LoadGraphicsEngineWebGPU)()
 {
-    return (GetEngineFactoryWebGPUType)LoadEngineDll("GraphicsEngineWebGPU", "GetEngineFactoryWebGPU");
+    static GetEngineFactoryWebGPUType GetFactoryFunc = NULL;
+    if (GetFactoryFunc == NULL)
+    {
+        GetFactoryFunc = (GetEngineFactoryWebGPUType)LoadEngineDll("GraphicsEngineWebGPU", "GetEngineFactoryWebGPU");
+    }
+    return GetFactoryFunc;
 }
 
 #else