[nostalgia] Integrate Ox Preloader

src/nostalgia/core/media.hpp

@@ -8,14 +8,28 @@
 
 #include <ox/claw/claw.hpp>
 #include <ox/fs/fs.hpp>
+#include <ox/model/metadata.hpp>
 
 #include "context.hpp"
 #include "typeconv.hpp"
 
 namespace nostalgia::core {
 
+struct PreloadPtr {
+	static constexpr auto TypeName = "net.drinkingtea.ox.PreloadPtr";
+	static constexpr auto TypeVersion = 1;
+	uint32_t preloadAddr = 0;
+};
+
+oxModelBegin(PreloadPtr)
+	oxModelField(preloadAddr)
+oxModelEnd()
+
+ox::Result<std::size_t> getPreloadAddr(Context *ctx, const ox::FileAddress &file) noexcept;
+
 template<typename T>
-ox::Result<AssetRef<T>> readObj(Context *ctx, const ox::FileAddress &file, bool forceLoad = false) noexcept {
+ox::Result<AssetRef<T>> readObj(Context *ctx, const ox::FileAddress &file,
+                                [[maybe_unused]] bool forceLoad = false) noexcept {
 #ifndef OX_BARE_METAL
 	constexpr auto readConvert = [](const ox::Buffer &buff) -> ox::Result<T> {
 		auto [obj, err] = ox::readClaw<T>(buff);
@@ -43,12 +57,17 @@ ox::Result<AssetRef<T>> readObj(Context *ctx, const ox::FileAddress &file, bool
 		return std::move(cached);
 	}
 #else
-	return OxError(1);
+	if constexpr(ox::preloadable<T>::value) {
+		return AssetRef<T>{*reinterpret_cast<T*>(getPreloadAddr(ctx, file))};
+	} else {
+		return OxError(1);
+	}
 #endif
 }
 
 template<typename T>
-ox::Error writeObj(Context *ctx, const ox::FileAddress &file, const T &obj, ox::ClawFormat fmt = ox::ClawFormat::Metal) noexcept {
+ox::Error writeObj(Context *ctx, const ox::FileAddress &file, const T &obj,
+                   ox::ClawFormat fmt = ox::ClawFormat::Metal) noexcept {
 	oxRequire(objBuff, ox::writeClaw(&obj, fmt));
 	return ctx->rom->write(file, objBuff.data(), objBuff.size());
 }