AnOutlinedDrawRenderTargetContent.cs

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using System;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
 
namespace Terraria.GameContent;
 
public abstract class AnOutlinedDrawRenderTargetContent : ARenderTargetContentByRequest
{
    protected int width = 84;
 
    protected int height = 84;
 
    public Color _borderColor = Color.White;
 
    private EffectPass _coloringShader;
 
    private RenderTarget2D _helperTarget;
 
    public void UseColor(Color color)
    {
        _borderColor = color;
    }
 
    protected override void HandleUseReqest(GraphicsDevice device, SpriteBatch spriteBatch)
    {
        Effect pixelShader = Main.pixelShader;
        if (_coloringShader == null)
        {
            _coloringShader = pixelShader.CurrentTechnique.Passes["ColorOnly"];
        }
        new Rectangle(0, 0, width, height);
        PrepareARenderTarget_AndListenToEvents(ref _target, device, width, height, RenderTargetUsage.PreserveContents);
        PrepareARenderTarget_WithoutListeningToEvents(ref _helperTarget, device, width, height, RenderTargetUsage.DiscardContents);
        device.SetRenderTarget(_helperTarget);
        device.Clear(Color.Transparent);
        spriteBatch.Begin(SpriteSortMode.Immediate, BlendState.AlphaBlend, SamplerState.PointClamp, DepthStencilState.None, RasterizerState.CullCounterClockwise, null);
        DrawTheContent(spriteBatch);
        spriteBatch.End();
        device.SetRenderTarget(_target);
        device.Clear(Color.Transparent);
        spriteBatch.Begin(SpriteSortMode.Immediate, BlendState.AlphaBlend, SamplerState.PointClamp, DepthStencilState.None, RasterizerState.CullCounterClockwise, null);
        _coloringShader.Apply();
        int num = 2;
        int num2 = num * 2;
        for (int i = -num2; i <= num2; i += num)
        {
            for (int j = -num2; j <= num2; j += num)
            {
                if (Math.Abs(i) + Math.Abs(j) == num2)
                {
                    spriteBatch.Draw(_helperTarget, new Vector2(i, j), Color.Black);
                }
            }
        }
        num2 = num;
        for (int k = -num2; k <= num2; k += num)
        {
            for (int l = -num2; l <= num2; l += num)
            {
                if (Math.Abs(k) + Math.Abs(l) == num2)
                {
                    spriteBatch.Draw(_helperTarget, new Vector2(k, l), _borderColor);
                }
            }
        }
        pixelShader.CurrentTechnique.Passes[0].Apply();
        spriteBatch.Draw(_helperTarget, Vector2.Zero, Color.White);
        spriteBatch.End();
        device.SetRenderTarget(null);
        _wasPrepared = true;
    }
 
    internal abstract void DrawTheContent(SpriteBatch spriteBatch);
}