Add start of headless

Author: Voltstro

src/Packages/UnityWebBrowser/Runtime/Core/WebBrowserClient.cs

@@ -288,6 +288,8 @@ public IWebBrowserLogger Logger
 
         #endregion
 
+        private bool headless;
+        private bool hasInitialized;
         private EngineProcess engineProcess;
         private WebBrowserCommunicationsManager communicationsManager;
         private CancellationTokenSource cancellationSource;
@@ -296,16 +298,33 @@ public IWebBrowserLogger Logger
         private NativeArray<byte> textureData;
         internal NativeArray<byte> nextTextureData;
 
-        internal WebBrowserClient()
+        /// <summary>
+        ///     Creates a new <see cref="WebBrowserClient"/> instance
+        /// </summary>
+        /// <param name="headless">
+        ///     Creates the browser client in headless mode.
+        ///     Headless mode will not create a <see cref="BrowserTexture"/> for you to use
+        /// </param>
+        public WebBrowserClient(bool headless = false)
         {
+            this.headless = headless;
         }
 
         /// <summary>
-        ///     Inits the browser client
+        ///     Inits the browser client.
+        ///     In normal operation you do not need to call this method.
         /// </summary>
         /// <exception cref="FileNotFoundException"></exception>
-        internal void Init()
+        /// <exception cref="InitializationException"></exception>
+        public void Init()
         {
+            //Initialized check
+            if (hasInitialized)
+                throw new InitializationException("The browser client has already been initialized!");
+
+            hasInitialized = true;
+            
+            //OS support check
             if (!WebBrowserUtils.IsRunningOnSupportedPlatform())
             {
                 logger.Warn("UWB is not supported on the current runtime platform! Not running.");
@@ -329,14 +348,16 @@ internal void Init()
             communicationLayer.IsInUse = true;
 
             //Setup texture
-            BrowserTexture = new Texture2D((int)resolution.Width, (int)resolution.Height, TextureFormat.BGRA32, false,
-                false);
-            WebBrowserUtils.SetAllTextureColorToOne(BrowserTexture, backgroundColor);
-
-            resizeLock = new object();
-            textureData = BrowserTexture.GetRawTextureData<byte>();
-            nextTextureData = new NativeArray<byte>(textureData.ToArray(), Allocator.Persistent);
-
+            if (!headless)
+            {
+                BrowserTexture = new Texture2D((int)resolution.Width, (int)resolution.Height, TextureFormat.BGRA32, false,
+                    false);
+                WebBrowserUtils.SetAllTextureColorToOne(BrowserTexture, backgroundColor);
+                resizeLock = new object();
+                textureData = BrowserTexture.GetRawTextureData<byte>();
+                nextTextureData = new NativeArray<byte>(textureData.ToArray(), Allocator.Persistent);
+            }
+            
             string browserEngineMainDir = WebBrowserUtils.GetAdditionFilesDirectory();
 
             //Start to build our arguments
@@ -412,11 +433,6 @@ internal void Init()
                 argsBuilder.AppendArgument("ignore-ssl-errors-domains", string.Join(",", ignoreSslErrorsDomains));
             }
 
-            //Make sure not to include this, its for testing
-#if UWB_ENGINE_PRJ //Define for backup, cause I am dumb as fuck and gonna accidentally include this in a release build one day 
-            //argsBuilder.AppendArgument("start-delay", 2000);
-#endif
-
             //Disable sandbox
             if (noSandbox)
             {
@@ -536,6 +552,10 @@ internal async UniTaskVoid EngineReady()
                     }
                 }
 
+                //Create pixel data loop in headless mode
+                if(headless)
+                    return;
+                
                 Thread pixelDataLoopThread = new(PixelDataLoop)
                 {
                     Name = "UWB Pixel Data Loop Thread"