DrawableGameComponent with its own RenderTarget2D

Graphics
1

I am working on a game that has a Core project and multiple implementation projects that target different platforms. I have created a new target project that uses a DrawableGameComponent to add development tools to the game. This is the Program.cs that I use to launch the game with this component.

	private static void Main(string[] args)
	{
		using var game = new CartridgePlatformerGame();
		game.IsMouseVisible = true;
		game.Components.Add(new DebuggerComponent(game));
		game.Run();
	}

I have given the DebuggerComponent its own RenderTarget2D to draw all of the tool elements before drawing it to the game buffer. However, when I call SetRenderTarget to the DebuggerComponent’s target, it clears out all of the visuals of the game.

Here is my Draw(GameTime gt) in my component:

		public override void Draw(GameTime gameTime)
		{
			base.Draw(gameTime);
			Game.GraphicsDevice.SetRenderTarget(ImGuiRenderTarget);
			Game.GraphicsDevice.Clear(Color.Transparent);
			ImGuiRenderer.BeginLayout(gameTime);
			foreach (ToolBase tool in Tools)
			{
				tool.ToolRoutine();
			}
			ImGuiRenderer.EndLayout();
			Game.GraphicsDevice.SetRenderTarget(null);
			Artist.SpriteBatch.Begin(SpriteSortMode.Deferred, BlendState.AlphaBlend, SamplerState.PointClamp, DepthStencilState.Default, RasterizerState.CullNone);
			Artist.SpriteBatch.Draw(ImGuiRenderTarget, GraphicsDevice.Viewport.Bounds, Color.White);
			Artist.SpriteBatch.End();
		}

Is there any way to draw to a render target in a DrawableGameComponent without affecting the base game or other DrawableGameComponents?

2

These are limitations of Monogame. You’ll have to either draw to the buffer last (otherwise it’ll clear), or draw everything to render targets and copy the image there each time (for example, via a spritebatch). Alternatively, try setting the RenderTargetUsage.PreserveContents parameter for the render target in the constructor.