From fc02f3fdad489597f2c2bf1e792e5dc49df2605f Mon Sep 17 00:00:00 2001
From: Michael Fabian 'Xaymar' Dirks <info@xaymar.com>
Date: Sun, 5 Nov 2017 20:05:48 +0100
Subject: [PATCH] plugin: Allow new filters and transitions to self-register

---
 source/plugin.cpp |  9 +++++++++
 source/plugin.h   | 29 +++++++++++++++++++++++++++++
 2 files changed, 38 insertions(+)

diff --git a/source/plugin.cpp b/source/plugin.cpp
index 0cf70243..96dfee31 100644
--- a/source/plugin.cpp
+++ b/source/plugin.cpp
@@ -32,15 +32,24 @@ Filter::Displacement *filterDisplacement;
 Filter::Shape *filterShape;
 Filter::Transform *filterTransform;
 
+std::list<std::function<void()>> initializerFunctions;
+std::list<std::function<void()>> finalizerFunctions;
+
 MODULE_EXPORT bool obs_module_load(void) {
 	filterDisplacement = new Filter::Displacement();
 	filterShape = new Filter::Shape();
 	filterTransform = new Filter::Transform();
 	filterBlur = new Filter::Blur();
+	for (auto func : initializerFunctions) {
+		func();
+	}
 	return true;
 }
 
 MODULE_EXPORT void obs_module_unload(void) {
+	for (auto func : finalizerFunctions) {
+		func();
+	}
 	delete filterTransform;
 	delete filterShape;
 	delete filterDisplacement;
diff --git a/source/plugin.h b/source/plugin.h
index b8ed7126..60b885f4 100644
--- a/source/plugin.h
+++ b/source/plugin.h
@@ -19,6 +19,8 @@
 
 #pragma once
 #include <inttypes.h>
+#include <list>
+#include <functional>
 
 #pragma warning (push)
 #pragma warning (disable: 4201)
@@ -57,3 +59,30 @@
 #define __FUNCTION_NAME__   __func__
 #endif
 #endif
+
+#ifdef __cplusplus
+#define INITIALIZER(f) \
+        static void f(void); \
+        struct f##_t_ { f##_t_(void) { f(); } }; static f##_t_ f##_; \
+        static void f(void)
+#elif defined(_MSC_VER)
+#pragma section(".CRT$XCU",read)
+#define INITIALIZER2_(f,p) \
+        static void f(void); \
+        __declspec(allocate(".CRT$XCU")) void (*f##_)(void) = f; \
+        __pragma(comment(linker,"/include:" p #f "_")) \
+        static void f(void)
+#ifdef _WIN64
+#define INITIALIZER(f) INITIALIZER2_(f,"")
+#else
+#define INITIALIZER(f) INITIALIZER2_(f,"_")
+#endif
+#else
+#define INITIALIZER(f) \
+        static void f(void) __attribute__((constructor)); \
+        static void f(void)
+#endif
+
+// Initializer & Finalizer
+extern std::list<std::function<void()>> initializerFunctions;
+extern std::list<std::function<void()>> finalizerFunctions;