ReflectiveArmorShaderData.cs

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using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Terraria.DataStructures;
using Terraria.Graphics.Shaders;
 
namespace Terraria.GameContent.Dyes;
 
public class ReflectiveArmorShaderData : ArmorShaderData
{
    public ReflectiveArmorShaderData(Ref<Effect> shader, string passName)
        : base(shader, passName)
    {
    }
 
    public override void Apply(Entity entity, DrawData? drawData)
    {
        if (entity == null)
        {
            base.Shader.Parameters["uLightSource"].SetValue(Vector3.Zero);
        }
        else
        {
            float num = 0f;
            if (drawData.HasValue)
            {
                num = drawData.Value.rotation;
            }
            Vector2 position = entity.position;
            float num2 = entity.width;
            float num3 = entity.height;
            Vector2 vector = position + new Vector2(num2, num3) * 0.1f;
            num2 *= 0.8f;
            num3 *= 0.8f;
            Vector3 subLight = Lighting.GetSubLight(vector + new Vector2(num2 * 0.5f, 0f));
            Vector3 subLight2 = Lighting.GetSubLight(vector + new Vector2(0f, num3 * 0.5f));
            Vector3 subLight3 = Lighting.GetSubLight(vector + new Vector2(num2, num3 * 0.5f));
            Vector3 subLight4 = Lighting.GetSubLight(vector + new Vector2(num2 * 0.5f, num3));
            float num4 = subLight.X + subLight.Y + subLight.Z;
            float num5 = subLight2.X + subLight2.Y + subLight2.Z;
            float num6 = subLight3.X + subLight3.Y + subLight3.Z;
            float num7 = subLight4.X + subLight4.Y + subLight4.Z;
            Vector2 spinningpoint = new Vector2(num6 - num5, num7 - num4);
            float num8 = spinningpoint.Length();
            if (num8 > 1f)
            {
                num8 = 1f;
                spinningpoint /= num8;
            }
            if (entity.direction == -1)
            {
                spinningpoint.X *= -1f;
            }
            spinningpoint = spinningpoint.RotatedBy(0f - num);
            Vector3 value = new Vector3(spinningpoint, 1f - (spinningpoint.X * spinningpoint.X + spinningpoint.Y * spinningpoint.Y));
            value.X *= 2f;
            value.Y -= 0.15f;
            value.Y *= 2f;
            value.Normalize();
            value.Z *= 0.6f;
            base.Shader.Parameters["uLightSource"].SetValue(value);
        }
        base.Apply(entity, drawData);
    }
}