[nostalgia/core] Add AssetManager

src/nostalgia/core/CMakeLists.txt

@@ -25,6 +25,7 @@ endif()
 
 install(
 	FILES
+		assetmanager.hpp
 		color.hpp
 		config.hpp
 		consts.hpp

src/nostalgia/core/assetmanager.hpp

@@ -0,0 +1,183 @@
+/*
+ * Copyright 2016 - 2021 gary@drinkingtea.net
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#pragma once
+
+#include <ox/model/typenamecatcher.hpp>
+#include <ox/fs/fs.hpp>
+#include <ox/std/hashmap.hpp>
+#include <ox/std/utility.hpp>
+
+namespace nostalgia::core {
+
+template<typename T>
+class AssetRef;
+
+template<typename T>
+struct AssetContainer {
+
+	friend AssetRef<T>;
+
+	private:
+		T m_obj;
+		mutable int m_references = 0;
+
+	public:
+		template<class... Args>
+		explicit AssetContainer(Args&&... args): m_obj(ox::forward<Args>(args)...) {
+		}
+
+		constexpr T *get() noexcept {
+			 return &m_obj;
+		}
+
+		constexpr const T *get() const noexcept {
+			 return &m_obj;
+		}
+
+	protected:
+		constexpr void incRefs() const noexcept {
+			++m_references;
+		}
+
+		constexpr void decRefs() const noexcept {
+			--m_references;
+		}
+
+};
+
+template<typename T>
+class AssetRef {
+	private:
+		const AssetContainer<T> *m_ctr = nullptr;
+
+	public:
+		explicit AssetRef(const AssetContainer<T> *c = nullptr) noexcept: m_ctr(c) {
+		}
+
+		AssetRef(const AssetRef &h) noexcept {
+			m_ctr = h.m_ctr;
+			if (m_ctr) {
+				m_ctr->incRefs();
+			}
+		}
+
+		AssetRef(AssetRef &&h) noexcept {
+			m_ctr = h.m_ctr;
+			h.m_ctr = nullptr;
+		}
+
+		~AssetRef() noexcept {
+			if (m_ctr) {
+				m_ctr->decRefs();
+			}
+		}
+
+		constexpr const T *get() const noexcept {
+			return m_ctr->get();
+		}
+
+		constexpr const T &operator*() const & noexcept {
+			return *m_ctr->get();
+		}
+
+		constexpr const T &&operator*() const && noexcept {
+			return *m_ctr->get();
+		}
+
+		constexpr const T *operator->() const noexcept {
+			return m_ctr->get();
+		}
+
+		AssetRef &operator=(const AssetRef &h) noexcept {
+			if (this == &h) {
+				return *this;
+			}
+			if (m_ctr) {
+				m_ctr->decRefs();
+			}
+			m_ctr = h.m_ctr;
+			if (m_ctr) {
+				m_ctr->incRefs();
+			}
+			return *this;
+		}
+
+		AssetRef &operator=(AssetRef &&h) noexcept {
+			if (this == &h) {
+				return *this;
+			}
+			m_ctr = h.m_ctr;
+			h.m_ctr = nullptr;
+			return *this;
+		}
+
+		explicit constexpr operator bool() const noexcept {
+			return m_ctr;
+		}
+
+};
+
+class AssetManager {
+	private:
+		class AssetTypeManagerBase {
+			public:
+				virtual ~AssetTypeManagerBase() = default;
+		};
+
+		template<typename T>
+		class AssetTypeManager: public AssetTypeManagerBase {
+			private:
+				ox::HashMap<ox::String, ox::UniquePtr<AssetContainer<T>>> m_cache;
+
+			public:
+				ox::Result<AssetRef<T>> getAsset(const ox::String &path) const noexcept {
+					auto out = m_cache.at(path);
+					oxReturnError(out);
+					return AssetRef<T>(out.value.get());
+				}
+
+				ox::Result<AssetRef<T>> setAsset(const ox::String &path, const T &obj) noexcept {
+					auto &p = m_cache[path] = ox::make_unique<AssetContainer<T>>(obj);
+					return AssetRef<T>(p.get());
+				}
+		};
+
+		ox::HashMap<ox::String, ox::UniquePtr<AssetTypeManagerBase>> m_assetTypeManagers;
+
+		template<typename T>
+		AssetTypeManager<T> *getTypeManager() noexcept {
+#if __cplusplus >= 202002L
+			constexpr auto typeName = ox::getModelTypeName<T>();
+			static_assert(ox_strcmp(typeName, "") != 0, "Types must have TypeName to use AssetManager");
+#else
+			const auto typeName = ox::getModelTypeName<T>();
+			oxAssert(ox_strcmp(typeName, "") != 0, "Types must have TypeName to use AssetManager");
+#endif
+			auto &am = m_assetTypeManagers[typeName];
+			if (!am) {
+				am = ox::make_unique<AssetTypeManager<T>>();
+			}
+			return dynamic_cast<AssetTypeManager<T>*>(am.get());
+		}
+
+	public:
+		template<typename T>
+		ox::Result<AssetRef<T>> getAsset(const ox::String &path) noexcept {
+			auto m = getTypeManager<T>();
+			return m->getAsset(path);
+		}
+
+		template<typename T>
+		ox::Result<AssetRef<T>> setAsset(const ox::String &path, const T &obj) noexcept {
+			auto m = getTypeManager<T>();
+			return m->setAsset(path, obj);
+		}
+};
+
+}

src/nostalgia/core/glfw/core.cpp

@@ -37,9 +37,10 @@ static void handleGlfwKeyEvent(GLFWwindow *window, int key, int, int action, int
 	}
 }
 
-ox::Result<ox::UniquePtr<Context>> init(ox::FileSystem *fs) noexcept {
+ox::Result<ox::UniquePtr<Context>> init(ox::UniquePtr<ox::FileSystem> fs, const char *appName) noexcept {
 	auto ctx = ox::make_unique<Context>();
-	ctx->rom = fs;
+	ctx->rom = std::move(fs);
+	ctx->appName = appName;
 	const auto id = new GlfwImplData;
 	ctx->setWindowerData(id);
 	using namespace std::chrono;

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;

src/nostalgia/core/userland/gfx.cpp

@@ -32,22 +32,22 @@ ox::Error loadBgTileSheet(Context *ctx,
                           const ox::FileAddress &tilesheetPath,
                           const ox::FileAddress &palettePath) noexcept {
 	oxRequire(tilesheet, readObj<NostalgiaGraphic>(ctx, tilesheetPath));
-	oxRequire(palette, readObj<NostalgiaPalette>(ctx, palettePath ? palettePath : tilesheet.defaultPalette));
-	const unsigned bytesPerTile = tilesheet.bpp == 8 ? 64 : 32;
-	const auto tiles = tilesheet.pixels.size() / bytesPerTile;
+	oxRequire(palette, readObj<NostalgiaPalette>(ctx, palettePath ? palettePath : tilesheet->defaultPalette));
+	const unsigned bytesPerTile = tilesheet->bpp == 8 ? 64 : 32;
+	const auto tiles = tilesheet->pixels.size() / bytesPerTile;
 	constexpr int width = 8;
 	const int height = 8 * static_cast<int>(tiles);
 	ox::Vector<uint32_t> pixels;
 	if (bytesPerTile == 64) { // 8 BPP
-		pixels.resize(tilesheet.pixels.size());
-		for (std::size_t i = 0; i < tilesheet.pixels.size(); ++i) {
-			pixels[i] = toColor32(palette.colors[tilesheet.pixels[i]]);
+		pixels.resize(tilesheet->pixels.size());
+		for (std::size_t i = 0; i < tilesheet->pixels.size(); ++i) {
+			pixels[i] = toColor32(palette->colors[tilesheet->pixels[i]]);
 		}
 	} else { // 4 BPP
-		pixels.resize(tilesheet.pixels.size() * 2);
-		for (std::size_t i = 0; i < tilesheet.pixels.size(); ++i) {
-			pixels[i * 2 + 0] = toColor32(palette.colors[tilesheet.pixels[i] & 0xF]);
-			pixels[i * 2 + 1] = toColor32(palette.colors[tilesheet.pixels[i] >> 4]);
+		pixels.resize(tilesheet->pixels.size() * 2);
+		for (std::size_t i = 0; i < tilesheet->pixels.size(); ++i) {
+			pixels[i * 2 + 0] = toColor32(palette->colors[tilesheet->pixels[i] & 0xF]);
+			pixels[i * 2 + 1] = toColor32(palette->colors[tilesheet->pixels[i] >> 4]);
 		}
 	}
 	return renderer::loadBgTexture(ctx, section, pixels.data(), width, height);