[nostalgia] Split part of Core out into Foundation, add module system

src/nostalgia/foundation/media.hpp

@@ -0,0 +1,99 @@
+/*
+ * Copyright 2016 - 2023 Gary Talent (gary@drinkingtea.net). All rights reserved.
+ */
+
+#pragma once
+
+#include <ox/std/defines.hpp>
+
+#include <ox/claw/claw.hpp>
+#include <ox/fs/fs.hpp>
+#include <ox/model/metadata.hpp>
+
+#include <nostalgia/foundation/context.hpp>
+
+#include "typeconv.hpp"
+
+namespace nostalgia::foundation {
+
+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(foundation::Context *ctx, const ox::FileAddress &file) noexcept;
+ox::Result<std::size_t> getPreloadAddr(foundation::Context *ctx, ox::CRStringView file) noexcept;
+
+template<typename T>
+ox::Result<foundation::AssetRef<T>> readObj([[maybe_unused]] foundation::Context *ctx, [[maybe_unused]] ox::CRStringView path,
+                                            [[maybe_unused]] bool forceLoad = false) noexcept {
+#ifndef OX_BARE_METAL
+	const auto readConvert = [ctx](const ox::Buffer &buff) -> ox::Result<T> {
+		auto [obj, err] = ox::readClaw<T>(buff);
+		if (err) {
+			if (err != ox::Error_ClawTypeVersionMismatch && err != ox::Error_ClawTypeMismatch) {
+				return err;
+			}
+			oxReturnError(convert<T>(ctx, buff, &obj));
+		}
+		return std::move(obj);
+	};
+	if (forceLoad) {
+		oxRequire(buff, ctx->rom->read(path));
+		oxRequire(obj, readConvert(buff));
+		oxRequire(cached, ctx->assetManager.setAsset(path, obj));
+		return std::move(cached);
+	} else {
+		auto [cached, err] = ctx->assetManager.getAsset<T>(path);
+		if (err) {
+			oxRequire(buff, ctx->rom->read(path));
+			oxRequire(obj, readConvert(buff));
+			oxReturnError(ctx->assetManager.setAsset(path, obj).moveTo(&cached));
+		}
+		return std::move(cached);
+	}
+#else
+	if constexpr(ox::preloadable<T>::value) {
+		oxRequire(addr, getPreloadAddr(ctx, path));
+		return foundation::AssetRef<T>(reinterpret_cast<const T*>(addr));
+	} else {
+		return OxError(1);
+	}
+#endif
+}
+
+template<typename T>
+ox::Result<foundation::AssetRef<T>> readObj(foundation::Context *ctx, const ox::FileAddress &file,
+                                            [[maybe_unused]] bool forceLoad = false) noexcept {
+#ifndef OX_BARE_METAL
+	oxRequire(path, file.getPath());
+	return readObj<T>(ctx, ox::StringView(path), forceLoad);
+#else
+	if constexpr(ox::preloadable<T>::value) {
+		oxRequire(addr, getPreloadAddr(ctx, file));
+		return foundation::AssetRef<T>(reinterpret_cast<const T*>(addr));
+	} else {
+		return OxError(1);
+	}
+#endif
+}
+
+template<typename T>
+ox::Error writeObj(foundation::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());
+}
+
+ox::Result<ox::UniquePtr<ox::FileSystem>> loadRomFs(ox::CRStringView path) noexcept;
+
+ox::Result<char*> loadRom(ox::CRStringView path = "") noexcept;
+
+void unloadRom(char*) noexcept;
+
+}