SimpleOverlay.cs

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using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using ReLogic.Content;
using Terraria.Graphics.Shaders;
 
namespace Terraria.Graphics.Effects;
 
public class SimpleOverlay : Overlay
{
    private Asset<Texture2D> _texture;
 
    private ScreenShaderData _shader;
 
    public Vector2 TargetPosition = Vector2.Zero;
 
    public SimpleOverlay(string textureName, ScreenShaderData shader, EffectPriority priority = EffectPriority.VeryLow, RenderLayers layer = RenderLayers.All)
        : base(priority, layer)
    {
        _texture = Main.Assets.Request<Texture2D>((textureName == null) ? "" : textureName, (AssetRequestMode)1);
        _shader = shader;
    }
 
    public SimpleOverlay(string textureName, string shaderName = "Default", EffectPriority priority = EffectPriority.VeryLow, RenderLayers layer = RenderLayers.All)
        : base(priority, layer)
    {
        _texture = Main.Assets.Request<Texture2D>((textureName == null) ? "" : textureName, (AssetRequestMode)1);
        _shader = new ScreenShaderData(Main.ScreenShaderRef, shaderName);
    }
 
    public ScreenShaderData GetShader()
    {
        return _shader;
    }
 
    public override void Draw(SpriteBatch spriteBatch)
    {
        _shader.UseGlobalOpacity(Opacity);
        _shader.UseTargetPosition(TargetPosition);
        _shader.Apply();
        spriteBatch.Draw(_texture.Value, new Rectangle(0, 0, Main.screenWidth, Main.screenHeight), Main.ColorOfTheSkies);
    }
 
    public override void Update(GameTime gameTime)
    {
        _shader.Update(gameTime);
    }
 
    public override void Activate(Vector2 position, params object[] args)
    {
        TargetPosition = position;
        Mode = OverlayMode.FadeIn;
    }
 
    public override void Deactivate(params object[] args)
    {
        Mode = OverlayMode.FadeOut;
    }
 
    public override bool IsVisible()
    {
        return _shader.CombinedOpacity > 0f;
    }
}