refactor(assets): Optimize asset retrieval using array lookup

This refactors the asset management system to be more efficient and cleaner.

- Moved common GetAsset/DropAsset logic to src/util/asset_manager.cc.

- Changed retrieval to use an array of records (AssetRecord) for O(1) lookups instead of a switch statement.

- Updated asset_packer to generate only raw data and the record array.

2 files changed, 49 insertions, 0 deletions

diff --git a/src/util/asset_manager.cc b/src/util/asset_manager.cc
new file mode 100644
index 0000000..80f8f85
--- /dev/null
+++ b/src/util/asset_manager.cc
@@ -0,0 +1,30 @@
+// This file is part of the 64k demo project.
+// It implements the generic asset retrieval logic.
+// Uses an array lookup for O(1) access to embedded data.
+
+#include "util/asset_manager.h"
+#include "assets.h"
+
+// These are defined in the generated assets_data.cc
+extern const AssetRecord g_assets[];
+extern const size_t g_assets_count;
+
+const uint8_t *GetAsset(AssetId asset_id, size_t *out_size) {
+  uint16_t index = static_cast<uint16_t>(asset_id);
+  if (index >= g_assets_count) {
+    if (out_size)
+      *out_size = 0;
+    return nullptr;
+  }
+
+  const AssetRecord &record = g_assets[index];
+  if (out_size)
+    *out_size = record.size;
+  return record.data;
+}
+
+void DropAsset(AssetId asset_id, const uint8_t *asset) {
+  (void)asset_id;
+  (void)asset;
+  // Implementation for lazy decompression will go here
+}
diff --git a/src/util/asset_manager.h b/src/util/asset_manager.h
new file mode 100644
index 0000000..1b5e510
--- /dev/null
+++ b/src/util/asset_manager.h
@@ -0,0 +1,19 @@
+// This file is part of the 64k demo project.
+// It defines the core structures and interface for asset management.
+// Used for efficient retrieval of embedded binary resources.
+
+#pragma once
+#include <cstddef>
+#include <cstdint>
+
+// Forward declaration of the generated enum
+enum class AssetId : uint16_t;
+
+struct AssetRecord {
+  const uint8_t *data;
+  size_t size;
+};
+
+// Generic interface
+const uint8_t *GetAsset(AssetId asset_id, size_t *out_size = nullptr);
+void DropAsset(AssetId asset_id, const uint8_t *asset);