From d0baabd3da733de91b35d05d0820ef7833676c05 Mon Sep 17 00:00:00 2001
From: GeorgH93 <git@georgh93.eu>
Date: Fri, 17 Nov 2023 21:33:44 +0100
Subject: [PATCH] Add ResourceLoader

---
 openVulkanoCpp/Host/ResourceLoader.cpp        | 76 +++++++++++++++++++
 openVulkanoCpp/Host/ResourceLoader.hpp        | 25 ++++++
 .../Host/iOS/BundledResoureLoaderIos.h        | 19 +++++
 .../Host/iOS/BundledResoureLoaderIos.mm       | 30 ++++++++
 4 files changed, 150 insertions(+)
 create mode 100644 openVulkanoCpp/Host/ResourceLoader.cpp
 create mode 100644 openVulkanoCpp/Host/ResourceLoader.hpp
 create mode 100644 openVulkanoCpp/Host/iOS/BundledResoureLoaderIos.h
 create mode 100644 openVulkanoCpp/Host/iOS/BundledResoureLoaderIos.mm

diff --git a/openVulkanoCpp/Host/ResourceLoader.cpp b/openVulkanoCpp/Host/ResourceLoader.cpp
new file mode 100644
index 0000000..9eaaf5e
--- /dev/null
+++ b/openVulkanoCpp/Host/ResourceLoader.cpp
@@ -0,0 +1,76 @@
+/*
+ * 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 https://mozilla.org/MPL/2.0/.
+ */
+
+#include "ResourceLoader.hpp"
+#include "Base/Logger.hpp"
+#include <vector>
+
+namespace OpenVulkano
+{
+	class AggregatingResourceLoader final : public ResourceLoader
+	{
+		std::vector<std::unique_ptr<ResourceLoader>> m_loaders;
+
+	public:
+		Array<char> GetResource(const std::string& resourceName) override
+		{
+			for(auto& loader : m_loaders)
+			{
+				try
+				{
+					auto res = loader->GetResource(resourceName);
+					if (!res.Empty()) return res;
+				}
+				catch (const std::exception& e)
+				{
+					Logger::FILESYS->error("Error trying to get resource for '{}'! Error: {}", resourceName, e.what());
+				}
+				catch (...)
+				{
+					Logger::FILESYS->error("Unknown error trying to get resource for '{}'!", resourceName);
+				}
+			}
+			return { 0 };
+		}
+
+		void* Register(std::unique_ptr<ResourceLoader> loader)
+		{
+			m_loaders.push_back(std::move(loader));
+			return m_loaders.back().get();
+		}
+
+		bool Unregister(void* loaderHandle)
+		{
+			for(auto iter = m_loaders.begin(); iter != m_loaders.end(); iter++)
+			{
+				if (iter->get() == loaderHandle)
+				{
+					m_loaders.erase(iter);
+					return true;
+				}
+			}
+			return false;
+		}
+	};
+
+	ResourceLoader& ResourceLoader::GetInstance()
+	{
+		static AggregatingResourceLoader resourceLoader;
+		return resourceLoader;
+	}
+
+	void* ResourceLoader::RegisterResourceLoader(std::unique_ptr<ResourceLoader> loader)
+	{
+		AggregatingResourceLoader* aggregator = static_cast<AggregatingResourceLoader*>(&GetInstance());
+		return aggregator->Register(std::move(loader));
+	}
+
+	bool ResourceLoader::UnregisterResourceLoader(void* loaderHandle)
+	{
+		AggregatingResourceLoader* aggregator = static_cast<AggregatingResourceLoader*>(&GetInstance());
+		return aggregator->Unregister(loaderHandle);
+	}
+}
\ No newline at end of file
diff --git a/openVulkanoCpp/Host/ResourceLoader.hpp b/openVulkanoCpp/Host/ResourceLoader.hpp
new file mode 100644
index 0000000..50622fe
--- /dev/null
+++ b/openVulkanoCpp/Host/ResourceLoader.hpp
@@ -0,0 +1,25 @@
+/*
+ * 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 https://mozilla.org/MPL/2.0/.
+ */
+
+#include "Data/Containers/Array.hpp"
+#include <memory>
+
+namespace OpenVulkano
+{
+	class ResourceLoader
+	{
+	public:
+		virtual ~ResourceLoader() = default;
+
+		virtual Array<char> GetResource(const std::string& resourceName) = 0;
+
+		static ResourceLoader& GetInstance();
+
+		static void* RegisterResourceLoader(std::unique_ptr<ResourceLoader> loader);
+
+		static bool UnregisterResourceLoader(void* loaderHandle);
+	};
+}
\ No newline at end of file
diff --git a/openVulkanoCpp/Host/iOS/BundledResoureLoaderIos.h b/openVulkanoCpp/Host/iOS/BundledResoureLoaderIos.h
new file mode 100644
index 0000000..a817c82
--- /dev/null
+++ b/openVulkanoCpp/Host/iOS/BundledResoureLoaderIos.h
@@ -0,0 +1,19 @@
+/*
+ * 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 https://mozilla.org/MPL/2.0/.
+ */
+
+#pragma once
+
+#import <Foundation/Foundation.h>
+#include "Host/ResourceLoader.hpp"
+
+namespace OpenVulkano
+{
+	class BundledResourceLoaderIOS : public ResourceLoader
+	{
+	public:
+		Array<char> GetResource(const std::string& resourceName) override;
+	};
+}
\ No newline at end of file
diff --git a/openVulkanoCpp/Host/iOS/BundledResoureLoaderIos.mm b/openVulkanoCpp/Host/iOS/BundledResoureLoaderIos.mm
new file mode 100644
index 0000000..a6e04ec
--- /dev/null
+++ b/openVulkanoCpp/Host/iOS/BundledResoureLoaderIos.mm
@@ -0,0 +1,30 @@
+/*
+ * 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 https://mozilla.org/MPL/2.0/.
+ */
+
+#include "BundledResoureLoaderIos.h"
+#include "Base/Logger.hpp"
+#include "Base/Utils.hpp"
+
+namespace OpenVulkano
+{
+	namespace
+	{
+		void* LOADER_HANDLE = ResourceLoader::RegisterResourceLoader(std::move(std::unique_ptr<ResourceLoader>(new BundledResourceLoaderIOS())));
+	}
+
+
+	Array<char> BundledResourceLoaderIOS::GetResource(const std::string& resourceName)
+	{
+		@autoreleasepool
+		{
+			auto [fileName, fileType] = Utils::SplitAtLastOccurrence(resourceName, '.');
+			NSString* filePath = [[NSBundle mainBundle] pathForResource:[NSString stringWithUTF8String:fileName.c_str()] ofType:[NSString stringWithUTF8String:fileType.c_str()]];
+			return Utils::ReadFile(std::string([filePath UTF8String]));
+		}
+		Logger::FILESYS->warn("Failed to find resource: '{}' in bundle", resourceName);
+		return {0};
+	}
+}