Initial Commit

Source/Simulore_Tirsova/PreloadSubsystem.h

@@ -0,0 +1,70 @@
+#pragma once
+
+#include "CoreMinimal.h"
+#include "Subsystems/GameInstanceSubsystem.h"
+#include "Engine/StreamableManager.h"
+#include "PreloadSubsystem.generated.h"
+
+DECLARE_DYNAMIC_MULTICAST_DELEGATE(FOnPreloadComplete);
+DECLARE_DYNAMIC_MULTICAST_DELEGATE_OneParam(FOnPreloadProgress, float, Progress);
+
+/**
+ * Preloads assets before level transition to prevent streaming pop-in.
+ *
+ * Usage from Blueprint:
+ *   1. Get this subsystem from GameInstance
+ *   2. Bind OnPreloadComplete / OnPreloadProgress
+ *   3. Call StartPreload with content paths to scan
+ *   4. Poll GetProgress() for loading bar
+ *   5. On complete, open your target level
+ */
+UCLASS()
+class SIMULORE_TIRSOVA_API UPreloadSubsystem : public UGameInstanceSubsystem
+{
+	GENERATED_BODY()
+
+public:
+	/**
+	 * Preload all assets found in the given content directory paths (recursive).
+	 * Example paths: "/Game/ArchVis", "/Game/CollaborativeViewer"
+	 */
+	UFUNCTION(BlueprintCallable, Category = "Preload")
+	void StartPreload(const TArray<FString>& ContentPaths);
+
+	/**
+	 * Preload specific assets by soft object path.
+	 * Useful when you know exactly which heavy assets to load.
+	 */
+	UFUNCTION(BlueprintCallable, Category = "Preload")
+	void PreloadAssets(const TArray<FSoftObjectPath>& Assets);
+
+	/** Current loading progress 0.0 to 1.0. Poll this from your loading widget. */
+	UFUNCTION(BlueprintCallable, BlueprintPure, Category = "Preload")
+	float GetProgress() const;
+
+	/** Number of assets being loaded. */
+	UFUNCTION(BlueprintCallable, BlueprintPure, Category = "Preload")
+	int32 GetTotalAssetCount() const;
+
+	UFUNCTION(BlueprintCallable, BlueprintPure, Category = "Preload")
+	bool IsPreloading() const;
+
+	/** Fires when all assets finish loading. */
+	UPROPERTY(BlueprintAssignable, Category = "Preload")
+	FOnPreloadComplete OnPreloadComplete;
+
+	/** Fires each frame with current progress. Bind to update your loading bar. */
+	UPROPERTY(BlueprintAssignable, Category = "Preload")
+	FOnPreloadProgress OnPreloadProgress;
+
+private:
+	void BeginAsyncLoad();
+	void OnAssetsLoaded();
+	bool TickProgress(float DeltaTime);
+
+	TSharedPtr<FStreamableHandle> StreamableHandle;
+	TArray<FSoftObjectPath> PendingAssets;
+	FTSTicker::FDelegateHandle TickerHandle;
+	int32 TotalAssets = 0;
+	bool bIsPreloading = false;
+};