add from giga-device, new branch added

StgSharp.Common/MVVM/ViewPort.cs

@@ -0,0 +1,122 @@
+//-----------------------------------------------------------------------
+// -----------------------------------------------------------------------
+// file="ViewPort.cs"
+// Project: StgSharp
+// AuthorGroup: Nitload Space
+// Copyright (c) Nitload Space. All rights reserved.
+//     
+// Permission is hereby granted, free of charge, to any person 
+// obtaining a copy of this software and associated documentation 
+// files (the “Software”), to deal in the Software without restriction, 
+// including without limitation the rights to use, copy, modify, merge,
+// publish, distribute, sublicense, and/or sell copies of the Software, 
+// and to permit persons to whom the Software is furnished to do so, 
+// subject to the following conditions:
+//     
+// The above copyright notice and 
+// this permission notice shall be included in all copies 
+// or substantial portions of the Software.
+//     
+// THE SOFTWARE IS PROVIDED “AS IS”, 
+// WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, 
+// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 
+// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 
+// ARISING FROM, OUT OF OR IN CONNECTION WITH 
+// THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//     
+// -----------------------------------------------------------------------
+// -----------------------------------------------------------------------
+using System;
+using System.Collections.Concurrent;
+using System.Diagnostics;
+using System.Diagnostics.Contracts;
+using System.Runtime.CompilerServices;
+using System.Text;
+using System.Threading;
+
+namespace StgSharp.MVVM
+{
+    public class ViewPort
+    {
+
+        private static readonly ConcurrentDictionary<IntPtr, ViewPort> _handleToViewPortIndex = [];
+        private int _width, _height, _newWidth, _newHeight;
+
+        internal ViewPort()
+        {
+            _newHeight = 600;
+            _newWidth = 800;
+            FlushSize();
+            Name = new StackFrame(1, false).
+                GetMethod()!.DeclaringType!.Name;
+            Monitor = IntPtr.Zero;
+            ViewPortHandle = InternalIO.glfwCreateWindow(
+                _newWidth, _newHeight, Encoding.UTF8.GetBytes(Name), Monitor, IntPtr.Zero);
+            if (ViewPortHandle == IntPtr.Zero) {
+                throw new InvalidOperationException("Unable to create viewport handle.");
+            }
+            _ = _handleToViewPortIndex.TryAdd(ViewPortHandle, this);
+        }
+
+        public ViewPort(int width, int height, string name, IntPtr monitor)
+        {
+            _newWidth = width;
+            _newHeight = height;
+            FlushSize();
+            Name = name;
+            Monitor = monitor;
+            ViewPortHandle = InternalIO.glfwCreateWindow(
+                _newWidth, _newHeight, Encoding.UTF8.GetBytes(Name), Monitor, IntPtr.Zero);
+            if (ViewPortHandle == IntPtr.Zero) {
+                throw new InvalidOperationException("Unable to create viewport handle.");
+            }
+            _ = _handleToViewPortIndex.TryAdd(ViewPortHandle, this);
+        }
+
+        public unsafe int Height
+        {
+[MethodImpl(MethodImplOptions.AggressiveInlining)]
+            get => _height;
+[MethodImpl(MethodImplOptions.AggressiveInlining)]
+            internal set => Interlocked.Exchange(ref _height, value);
+        }
+
+        public unsafe int Width
+        {
+[MethodImpl(MethodImplOptions.AggressiveInlining)]
+            get => _width;
+[MethodImpl(MethodImplOptions.AggressiveInlining)]
+            internal set => Interlocked.Exchange(ref _width, value);
+        }
+
+        public IntPtr GraphicHandle { get; internal set; }
+
+        public IntPtr Monitor { get; internal set; }
+
+        public IntPtr ViewPortHandle { get; private set; }
+
+        public string Name { get; set; }
+
+        // [BlueprintNodeExecution]
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static bool GetExistedViewPort(IntPtr handle, out ViewPort port)
+        {
+            return _handleToViewPortIndex.TryGetValue(handle, out port);
+        }
+
+        internal unsafe void FlushSize()
+        {
+            _ = Interlocked.Exchange(ref _height, _newHeight);
+            _ = Interlocked.Exchange(ref _width, _newWidth);
+        }
+
+        internal void RequestFlushSizeInNextFrame(int width, int height)
+        {
+            _ = Interlocked.Exchange(ref _newHeight, height);
+            _ = Interlocked .Exchange(ref _newWidth, width);
+        }
+
+    }
+}