Merge pull request #201 from cortex-command-community/windows-live-resize

Add Windows window live resize

Author: Causeless

Source/Managers/WindowMan.cpp

@@ -1,7 +1,6 @@
 #include "WindowMan.h"
 #include "RTEError.h"
-#include "SDL3/SDL_error.h"
-#include "SDL3/SDL_video.h"
+#include "SDL3/SDL.h"
 #include "SettingsMan.h"
 #include "FrameMan.h"
 #include "ActivityMan.h"
@@ -155,6 +154,8 @@ void WindowMan::Initialize() {
 	} else {
 		SetViewportLetterboxed();
 	}
+
+	SDL_AddEventWatch((SDL_EventFilter)WindowMan::HandleWindowExposedEvent, nullptr);
 }
 
 void WindowMan::CreatePrimaryWindow() {
@@ -674,6 +675,14 @@ void WindowMan::DisplaySwitchOut() const {
 	SDL_SetCursor(nullptr);
 }
 
+void WindowMan::HandleWindowExposedEvent(void *userdata, SDL_Event *event) {
+	if (event->type == SDL_EVENT_WINDOW_EXPOSED) {
+		g_WindowMan.SetViewportLetterboxed();
+		g_WindowMan.ClearBackbuffer(false);
+		g_WindowMan.UploadFrame();
+	}
+}
+
 void WindowMan::QueueWindowEvent(const SDL_Event& windowEvent) {
 	m_EventQueue.emplace_back(windowEvent);
 }

Source/Managers/WindowMan.h

@@ -168,6 +168,9 @@ namespace RTE {
 #pragma endregion
 
 #pragma region Concrete Methods
+		/// SDL_EventFilter to hadnle window exposed events for live resize.
+		static void HandleWindowExposedEvent(void* userdata, SDL_Event* event);
+
 		/// Adds an SDL_Event to the Event queue for processing on Update.
 		/// @param windowEvent The SDL window event to queue.
 		void QueueWindowEvent(const SDL_Event& windowEvent);