Implement SDL platform, windowing and input handling

Source/Engine/Platform/SDL/SDLPlatform.Windows.cpp

@@ -0,0 +1,64 @@
+// Copyright (c) 2012-2024 Wojciech Figat. All rights reserved.
+
+
+#if PLATFORM_SDL && PLATFORM_WINDOWS
+
+#include "SDLPlatform.h"
+#include "Engine/Core/Collections/Array.h"
+#include "Engine/Platform/WindowsManager.h"
+#include "Engine/Platform/Win32/IncludeWindowsHeaders.h"
+
+#include <SDL3/SDL_hints.h>
+#include <SDL3/SDL_init.h>
+#include <SDL3/SDL_system.h>
+
+// The events for releasing the mouse during window dragging are missing, handle the mouse release event here
+SDL_bool SDLCALL SDLPlatform::EventMessageHook(void* userdata, MSG* msg)
+{
+#define GET_WINDOW_WITH_HWND(window, hwnd) \
+    do { \
+        (window) = nullptr; \
+        WindowsManager::WindowsLocker.Lock(); \
+        for (int32 i = 0; i < WindowsManager::Windows.Count(); i++) \
+        { \
+            if (WindowsManager::Windows[i]->GetNativePtr() == (hwnd)) \
+            { \
+                (window) = WindowsManager::Windows[i]; \
+                break; \
+            } \
+        } \
+        WindowsManager::WindowsLocker.Unlock(); \
+        ASSERT((window) != nullptr); \
+    } while (false)
+
+    if (msg->message == WM_NCLBUTTONDOWN)
+    {
+        Window* window;
+        GET_WINDOW_WITH_HWND(window, msg->hwnd);
+        
+        auto hit = static_cast<WindowHitCodes>(msg->wParam);
+        if (SDLPlatform::CheckWindowDragging(window, hit))
+            return SDL_FALSE;
+    }
+    return SDL_TRUE;
+#undef GET_WINDOW_WITH_HWND
+}
+
+bool SDLPlatform::InitPlatform()
+{
+    // Workaround required for handling window dragging events properly for DockHintWindow
+    SDL_SetWindowsMessageHook(&EventMessageHook, nullptr);
+
+    if (WindowsPlatform::Init())
+        return true;
+
+    return false;
+}
+
+void SDLPlatform::SetHighDpiAwarenessEnabled(bool enable)
+{
+    // Other supported values: "permonitor", "permonitorv2"
+    SDL_SetHint("SDL_WINDOWS_DPI_AWARENESS", enable ? "system" : "unaware");
+}
+
+#endif