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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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