ShaderData.cs

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using Microsoft.Xna.Framework.Graphics;
 
namespace Terraria.Graphics.Shaders;
 
public class ShaderData
{
    private readonly Ref<Effect> _shader;
 
    private string _passName;
 
    private EffectPass _effectPass;
 
    public Effect Shader
    {
        get
        {
            if (_shader != null)
            {
                return _shader.Value;
            }
            return null;
        }
    }
 
    public ShaderData(Ref<Effect> shader, string passName)
    {
        _passName = passName;
        _shader = shader;
    }
 
    public void SwapProgram(string passName)
    {
        _passName = passName;
        if (passName != null)
        {
            _effectPass = Shader.CurrentTechnique.Passes[passName];
        }
    }
 
    public virtual void Apply()
    {
        if (_shader != null && Shader != null && _passName != null)
        {
            _effectPass = Shader.CurrentTechnique.Passes[_passName];
        }
        _effectPass.Apply();
    }
}