[nostalgia/core] Add AssetManager

src/nostalgia/core/media.hpp

@@ -16,9 +16,26 @@
 namespace nostalgia::core {
 
 template<typename T>
-ox::Result<T> readObj(Context *ctx, const ox::FileAddress &file) noexcept {
-	oxRequire(buff, ctx->rom->read(file));
-	return ox::readClaw<T>(buff);
+ox::Result<AssetRef<T>> readObj(Context *ctx, const ox::FileAddress &file, bool forceLoad = false) noexcept {
+#ifndef OX_BARE_METAL
+	oxRequire(path, file.getPath());
+	if (forceLoad) {
+		oxRequire(buff, ctx->rom->read(file));
+		oxRequire(obj, ox::readClaw<T>(buff));
+		oxRequire(cached, ctx->assetManager.template setAsset(path, obj));
+		return cached;
+	} else {
+		auto [cached, err] = ctx->assetManager.template getAsset<T>(path);
+		if (err) {
+			oxRequire(buff, ctx->rom->read(file));
+			oxRequire(obj, ox::readClaw<T>(buff));
+			oxReturnError(ctx->assetManager.template setAsset(path, obj).moveTo(&cached));
+		}
+		return cached;
+	}
+#else
+	return OxError(1);
+#endif
 }
 
 ox::Result<ox::UniquePtr<ox::FileSystem>> loadRomFs(const char *path) noexcept;