Changed the dynamic library open function to allow setting the path of the library to open extra libraries.

core/os/os.h

@@ -195,7 +195,7 @@ public:
 	virtual void set_ime_position(const Point2 &p_pos) {}
 	virtual void set_ime_intermediate_text_callback(ImeCallback p_callback, void *p_inp) {}
 
-	virtual Error open_dynamic_library(const String p_path, void *&p_library_handle) { return ERR_UNAVAILABLE; }
+	virtual Error open_dynamic_library(const String p_path, void *&p_library_handle,bool p_also_set_library_path=false) { return ERR_UNAVAILABLE; }
 	virtual Error close_dynamic_library(void *p_library_handle) { return ERR_UNAVAILABLE; }
 	virtual Error get_dynamic_library_symbol_handle(void *p_library_handle, const String p_name, void *&p_symbol_handle, bool p_optional = false) { return ERR_UNAVAILABLE; }
 

drivers/unix/os_unix.cpp

@@ -391,7 +391,7 @@ String OS_Unix::get_locale() const {
 	return locale;
 }
 
-Error OS_Unix::open_dynamic_library(const String p_path, void *&p_library_handle) {
+Error OS_Unix::open_dynamic_library(const String p_path, void *&p_library_handle,bool p_also_set_library_path) {
 	p_library_handle = dlopen(p_path.utf8().get_data(), RTLD_NOW);
 	if (!p_library_handle) {
 		ERR_EXPLAIN("Can't open dynamic library: " + p_path + ". Error: " + dlerror());

drivers/unix/os_unix.h

@@ -77,7 +77,7 @@ public:
 	//virtual VideoMode get_video_mode() const;
 	//virtual void get_fullscreen_mode_list(List<VideoMode> *p_list) const;
 
-	virtual Error open_dynamic_library(const String p_path, void *&p_library_handle);
+	virtual Error open_dynamic_library(const String p_path, void *&p_library_handle,bool p_also_set_library_path=false);
 	virtual Error close_dynamic_library(void *p_library_handle);
 	virtual Error get_dynamic_library_symbol_handle(void *p_library_handle, const String p_name, void *&p_symbol_handle, bool p_optional = false);
 

modules/gdnative/gdnative.cpp

@@ -144,7 +144,7 @@ bool GDNative::initialize() {
 		}
 	}
 
-	Error err = OS::get_singleton()->open_dynamic_library(path, native_handle);
+	Error err = OS::get_singleton()->open_dynamic_library(path, native_handle,true);
 	if (err != OK) {
 		return false;
 	}

platform/windows/os_windows.cpp

@@ -1588,8 +1588,21 @@ void OS_Windows::_update_window_style(bool repaint) {
 	}
 }
 
-Error OS_Windows::open_dynamic_library(const String p_path, void *&p_library_handle) {
-	p_library_handle = (void *)LoadLibrary(p_path.utf8().get_data());
+Error OS_Windows::open_dynamic_library(const String p_path, void *&p_library_handle, bool p_also_set_library_path) {
+
+
+	DLL_DIRECTORY_COOKIE cookie;
+
+	if (p_also_set_library_path) {
+		cookie = AddDllDirectory(p_path.get_base_dir().c_str());
+	}
+
+	p_library_handle = (void *)LoadLibraryExW(p_path.c_str(),NULL,p_also_set_library_path ? LOAD_LIBRARY_SEARCH_USER_DIRS : 0);
+
+	if (p_also_set_library_path) {
+		RemoveDllDirectory(cookie);
+	}
+
 	if (!p_library_handle) {
 		ERR_EXPLAIN("Can't open dynamic library: " + p_path + ". Error: " + String::num(GetLastError()));
 		ERR_FAIL_V(ERR_CANT_OPEN);
@@ -1954,7 +1967,7 @@ void OS_Windows::set_icon(const Ref<Image> &p_icon) {
 
 bool OS_Windows::has_environment(const String &p_var) const {
 
-	return getenv(p_var.utf8().get_data()) != NULL;
+	return _wgetenv(p_var.c_str()) != NULL;
 };
 
 String OS_Windows::get_environment(const String &p_var) const {

platform/windows/os_windows.h

@@ -212,7 +212,7 @@ public:
 	virtual void set_borderless_window(int p_borderless);
 	virtual bool get_borderless_window();
 
-	virtual Error open_dynamic_library(const String p_path, void *&p_library_handle);
+	virtual Error open_dynamic_library(const String p_path, void *&p_library_handle,bool p_also_set_library_path=false);
 	virtual Error close_dynamic_library(void *p_library_handle);
 	virtual Error get_dynamic_library_symbol_handle(void *p_library_handle, const String p_name, void *&p_symbol_handle, bool p_optional = false);