removing submodule

depends/rpi-rgb-led-matrix/bindings/c#/examples/MatrixRain/MatrixRain.csproj

@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+	<PropertyGroup>
+		<OutputType>Exe</OutputType>
+		<TargetFramework>net6.0</TargetFramework>
+		<ImplicitUsings>enable</ImplicitUsings>
+		<Nullable>enable</Nullable>
+	</PropertyGroup>
+    <ItemGroup>
+        <ProjectReference Include="..\..\RPiRgbLEDMatrix.csproj"/>
+    </ItemGroup>
+</Project>

depends/rpi-rgb-led-matrix/bindings/c#/examples/MatrixRain/Program.cs

@@ -0,0 +1,74 @@
+using RPiRgbLEDMatrix;
+
+const int MaxHeight = 16;
+const int ColorStep = 15;
+const int FrameStep = 1;
+
+using var matrix = new RGBLedMatrix(new RGBLedMatrixOptions { ChainLength = 2 });
+var canvas = matrix.CreateOffscreenCanvas();
+
+var rnd = new Random();
+var points = new List<Point>();
+var recycled = new Stack<Point>();
+var frame = 0;
+
+var running = true;
+Console.CancelKeyPress += (s, e) =>
+{
+    running = false;
+    e.Cancel = true; // don't terminate, we need to dispose
+};
+
+// run until user presses Ctrl+C
+while (running)
+{
+    var frameStart = Environment.TickCount64;
+    frame++;
+
+    if (frame % FrameStep == 0)
+    {
+        if (recycled.Count == 0)
+            points.Add(new Point(rnd.Next(0, canvas.Width - 1), 0));
+        else
+        {
+            var point = recycled.Pop();
+            point.X = rnd.Next(0, canvas.Width - 1);
+            point.Y = 0;
+            point.Recycled = false;
+        }
+    }
+
+    canvas.Clear();
+
+    foreach (var point in points)
+    {
+        if (point.Recycled) continue;
+        point.Y++;
+
+        if (point.Y - MaxHeight > canvas.Height)
+        {
+            point.Recycled = true;
+            recycled.Push(point);
+        }
+
+        for (var i = 0; i < MaxHeight; i++)
+        {
+            canvas.SetPixel(point.X, point.Y - i, new Color(0, 255 - i * ColorStep, 0));
+        }
+    }
+
+    matrix.SwapOnVsync(canvas);
+
+    // force 30 FPS
+    var elapsed = Environment.TickCount64 - frameStart;
+    if (elapsed < 33) Thread.Sleep(33 - (int)elapsed);
+}
+
+class Point
+{
+    public int X;
+    public int Y;
+    public bool Recycled = false;
+
+    public Point(int x, int y) => (X, Y) = (x, y);
+}