+ plugins project

1 files changed, 41 insertions, 0 deletions

diff --git a/Plugins/MonoGame.Extended/source/MonoGame.Extended.Graphics/RenderTarget2DExtensions.cs b/Plugins/MonoGame.Extended/source/MonoGame.Extended.Graphics/RenderTarget2DExtensions.cs
new file mode 100644
index 0000000..f090603
--- /dev/null
+++ b/Plugins/MonoGame.Extended/source/MonoGame.Extended.Graphics/RenderTarget2DExtensions.cs
@@ -0,0 +1,41 @@
+using System;
+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Graphics;
+
+namespace MonoGame.Extended.Graphics
+{
+    public static class RenderTarget2DExtensions
+    {
+        public static IDisposable BeginDraw(this RenderTarget2D renderTarget, GraphicsDevice graphicsDevice,
+            Color backgroundColor)
+        {
+            return new RenderTargetOperation(renderTarget, graphicsDevice, backgroundColor);
+        }
+
+        private class RenderTargetOperation : IDisposable
+        {
+            private readonly GraphicsDevice _graphicsDevice;
+            private readonly RenderTargetUsage _previousRenderTargetUsage;
+            private readonly Viewport _viewport;
+
+            public RenderTargetOperation(RenderTarget2D renderTarget, GraphicsDevice graphicsDevice,
+                Color backgroundColor)
+            {
+                _graphicsDevice = graphicsDevice;
+                _viewport = _graphicsDevice.Viewport;
+                _previousRenderTargetUsage = _graphicsDevice.PresentationParameters.RenderTargetUsage;
+
+                _graphicsDevice.PresentationParameters.RenderTargetUsage = RenderTargetUsage.PreserveContents;
+                _graphicsDevice.SetRenderTarget(renderTarget);
+                _graphicsDevice.Clear(backgroundColor);
+            }
+
+            public void Dispose()
+            {
+                _graphicsDevice.SetRenderTarget(null);
+                _graphicsDevice.PresentationParameters.RenderTargetUsage = _previousRenderTargetUsage;
+                _graphicsDevice.Viewport = _viewport;
+            }
+        }
+    }
+}
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