FlameParticle.cs

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using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using ReLogic.Content;
using Terraria.DataStructures;
 
namespace Terraria.Graphics.Renderers;
 
public class FlameParticle : ABasicParticle
{
    public float FadeOutNormalizedTime = 1f;
 
    private float _timeTolive;
 
    private float _timeSinceSpawn;
 
    private int _indexOfPlayerWhoSpawnedThis;
 
    private int _packedShaderIndex;
 
    public override void FetchFromPool()
    {
        base.FetchFromPool();
        FadeOutNormalizedTime = 1f;
        _timeTolive = 0f;
        _timeSinceSpawn = 0f;
        _indexOfPlayerWhoSpawnedThis = 0;
        _packedShaderIndex = 0;
    }
 
    public override void SetBasicInfo(Asset<Texture2D> textureAsset, Rectangle? frame, Vector2 initialVelocity, Vector2 initialLocalPosition)
    {
        base.SetBasicInfo(textureAsset, frame, initialVelocity, initialLocalPosition);
        _origin = new Vector2(_frame.Width / 2, _frame.Height - 2);
    }
 
    public void SetTypeInfo(float timeToLive, int indexOfPlayerWhoSpawnedIt, int packedShaderIndex)
    {
        _timeTolive = timeToLive;
        _indexOfPlayerWhoSpawnedThis = indexOfPlayerWhoSpawnedIt;
        _packedShaderIndex = packedShaderIndex;
    }
 
    public override void Update(ref ParticleRendererSettings settings)
    {
        base.Update(ref settings);
        _timeSinceSpawn += 1f;
        if (_timeSinceSpawn >= _timeTolive)
        {
            base.ShouldBeRemovedFromRenderer = true;
        }
    }
 
    public override void Draw(ref ParticleRendererSettings settings, SpriteBatch spritebatch)
    {
        Color color = new Color(120, 120, 120, 60) * Utils.GetLerpValue(1f, FadeOutNormalizedTime, _timeSinceSpawn / _timeTolive, clamped: true);
        Vector2 vector = settings.AnchorPosition + LocalPosition;
        ulong seed = Main.TileFrameSeed ^ (((ulong)LocalPosition.X << 32) | (uint)LocalPosition.Y);
        Player player = Main.player[_indexOfPlayerWhoSpawnedThis];
        for (int i = 0; i < 4; i++)
        {
            DrawData drawData = new DrawData(position: vector + new Vector2(Utils.RandomInt(ref seed, -2, 3), Utils.RandomInt(ref seed, -2, 3)) * Scale, texture: _texture.Value, sourceRect: _frame, color: color, rotation: Rotation, origin: _origin, scale: Scale, effect: SpriteEffects.None);
            drawData.shader = _packedShaderIndex;
            DrawData cdd = drawData;
            PlayerDrawHelper.SetShaderForData(player, 0, ref cdd);
            cdd.Draw(spritebatch);
        }
        Main.pixelShader.CurrentTechnique.Passes[0].Apply();
    }
}