Cherry pick of global delta time from 'options-menu' branch.

Co-authored-by: Hyper <34012267+hyperbx@users.noreply.github.com>

UnleashedRecomp/CMakeLists.txt

@@ -79,6 +79,7 @@ set(SWA_UI_CXX_SOURCES
 )
 
 set(SWA_CXX_SOURCES
+    "app.cpp"
     "main.cpp"
     "misc_impl.cpp"
     "stdafx.cpp"

UnleashedRecomp/app.cpp

@@ -0,0 +1,19 @@
+#include <kernel/function.h>
+#include <ui/window.h>
+#include <app.h>
+
+double g_deltaTime;
+
+// CApplication::Update
+PPC_FUNC_IMPL(__imp__sub_822C1130);
+PPC_FUNC(sub_822C1130)
+{
+    g_deltaTime = ctx.f1.f64;
+
+    SDL_PumpEvents();
+    SDL_FlushEvents(SDL_FIRSTEVENT, SDL_LASTEVENT);
+
+    Window::Update();
+
+    __imp__sub_822C1130(ctx, base);
+}

UnleashedRecomp/app.h

@@ -0,0 +1,3 @@
+#pragma once
+
+extern double g_deltaTime;

UnleashedRecomp/ui/window.cpp

@@ -1,7 +1,6 @@
 #include "window.h"
 #include "sdl_listener.h"
 #include <cfg/config.h>
-#include <kernel/function.h>
 #include <SDL_syswm.h>
 
 bool m_isFullscreenKeyReleased = true;
@@ -175,15 +174,3 @@ void Window::Update()
         Config::WindowHeight = Window::s_height;
     }
 }
-
-// CApplication::Update
-PPC_FUNC_IMPL(__imp__sub_822C1130);
-PPC_FUNC(sub_822C1130)
-{
-    SDL_PumpEvents();
-    SDL_FlushEvents(SDL_FIRSTEVENT, SDL_LASTEVENT);
-
-    Window::Update();
-
-    __imp__sub_822C1130(ctx, base);
-}