From 604e34a12a6a9ccdd4e0098ab654834f382e4e6f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Simon=20L=C3=BCbe=C3=9F?= <simon.luebess@gmail.com>
Date: Sat, 9 Apr 2022 12:34:09 +0200
Subject: [PATCH] Start of ContentManager

---
 GlitchyEngine/src/Content/ContentManager.bf | 61 +++++++++++++++++++++
 GlitchyEngine/src/Renderer/Texture.bf       | 23 +++++---
 2 files changed, 77 insertions(+), 7 deletions(-)
 create mode 100644 GlitchyEngine/src/Content/ContentManager.bf

diff --git a/GlitchyEngine/src/Content/ContentManager.bf b/GlitchyEngine/src/Content/ContentManager.bf
new file mode 100644
index 0000000..789abd7
--- /dev/null
+++ b/GlitchyEngine/src/Content/ContentManager.bf
@@ -0,0 +1,61 @@
+using System;
+using System.IO;
+using xxHash;
+
+namespace GlitchyEngine.Content
+{
+	class ContentId
+	{
+		private readonly String _string;
+		private readonly XXH64_hash _hash;
+
+		public String String => _string;
+		public XXH64_hash Hash => _hash;
+
+		[AllowAppend]
+		public this(StringView id)
+		{
+			String str = append String(id);
+
+		    _string = str;
+
+		    _hash = xxHash.ComputeHash(id);
+		}
+	}
+
+	interface IContentManager
+	{
+		Stream GetFile(String filename);
+	}
+
+	class ContentManager : IContentManager
+	{
+		private String _contentRoot;
+
+		[AllowAppend]
+		public this(String contentRoot)
+		{
+			String cntRoot = append String(contentRoot);
+			_contentRoot = cntRoot;
+
+			Runtime.Assert(Directory.Exists(contentRoot), "Content root directory doesn't exist.");
+		}
+
+		public Stream GetFile(String filename)
+		{
+			String fullpath = scope .(_contentRoot.Length + 1 + filename.Length);
+			Path.InternalCombine(fullpath, _contentRoot, filename);
+
+			FileStream stream = new FileStream();
+			var result = stream.Open(fullpath, .Read, .Read);
+
+			if (result case .Err(let error))
+			{
+				Log.EngineLogger.Error($"Failed to open file \"{fullpath}\". Error: {error}");
+				return null;
+			}
+
+			return stream;
+		}
+	}
+}
\ No newline at end of file
diff --git a/GlitchyEngine/src/Renderer/Texture.bf b/GlitchyEngine/src/Renderer/Texture.bf
index 6e57c5b..1694b44 100644
--- a/GlitchyEngine/src/Renderer/Texture.bf
+++ b/GlitchyEngine/src/Renderer/Texture.bf
@@ -78,12 +78,12 @@ namespace GlitchyEngine.Renderer
 		{
 			Debug.Profiler.ProfileResourceFunction!();
 
-			FileStream fs = new FileStream();
+			Stream data = Application.Get().ContentManager.GetFile(_path);
+			defer delete data;
 
-			fs.Open(_path, .Read);
-			var readResult = fs.Read<char8[8]>();
+			var readResult = data.Read<char8[8]>();
 
-			delete fs;
+			data.Position = 0;
 
 			char8[8] magicWord;
 
@@ -93,7 +93,7 @@ namespace GlitchyEngine.Renderer
 
 				if (strView.StartsWith(PngMagicWord))
 				{
-					LoadPng();
+					LoadPng(data);
 				}
 				else if (strView.StartsWith(DdsMagicWord))
 				{
@@ -106,14 +106,23 @@ namespace GlitchyEngine.Renderer
 			}
 		}
 
-		protected void LoadPng()
+		protected void LoadPng(Stream stream)
 		{
 			Debug.Profiler.ProfileResourceFunction!();
+			
+			uint8[] pngData = new:ScopedAlloc! uint8[stream.Length];
+
+			var result = stream.TryRead(pngData);
+
+			if (result case .Err(let err))
+			{
+				Log.EngineLogger.Error($"Failed to read data from stream. Texture: \"{_path}\", Error: {err}");
+			}
 
 			uint8* rawData = ?;
 			uint32 width = 0, height = 0;
 
-			uint32 errorCode = LodePng.LodePng.Decode32File(&rawData, &width, &height, _path.CStr());
+			uint32 errorCode = LodePng.LodePng.Decode32(&rawData, &width, &height, pngData.Ptr, (.)pngData.Count);
 
 			Debug.Assert(errorCode == 0, "Failed to load png File");