mmorpg2d/Assets/Spine Examples/Scripts/Sample Components/SkeletonRenderTexture/SkeletonRenderTextureFadeout.cs

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#if UNITY_2019_3_OR_NEWER
#define HAS_FORCE_RENDER_OFF
#endif

#if UNITY_2017_2_OR_NEWER
#define HAS_VECTOR_INT
#endif

using UnityEngine;

namespace Spine.Unity.Examples {

	/// <summary>
	/// A simple fadeout component that uses a <see cref="SkeletonRenderTexture"/> for transparency fadeout.
	/// Attach a <see cref="SkeletonRenderTexture"/> and this component to a skeleton GameObject and disable both
	/// components initially and keep them disabled during normal gameplay. When you need to start fadeout,
	/// enable this component.
	/// At the end of the fadeout, the event delegate <c>OnFadeoutComplete</c> is called, to which you can bind e.g.
	/// a method that disables or destroys the entire GameObject.
	/// </summary>
	[RequireComponent(typeof(SkeletonRenderTexture))]
	public class SkeletonRenderTextureFadeout : MonoBehaviour {
		SkeletonRenderTexture skeletonRenderTexture;

		public float fadeoutSeconds = 2.0f;
		protected float fadeoutSecondsRemaining;

		public delegate void FadeoutCallback (SkeletonRenderTextureFadeout skeleton);
		public event FadeoutCallback OnFadeoutComplete;

		protected void Awake () {
			skeletonRenderTexture = this.GetComponent<SkeletonRenderTexture>();
		}

		protected void OnEnable () {
			fadeoutSecondsRemaining = fadeoutSeconds;
			skeletonRenderTexture.enabled = true;
		}

		protected void Update () {
			if (fadeoutSecondsRemaining == 0)
				return;

			fadeoutSecondsRemaining -= Time.deltaTime;
			if (fadeoutSecondsRemaining <= 0) {
				fadeoutSecondsRemaining = 0;
				if (OnFadeoutComplete != null)
					OnFadeoutComplete(this);
				return;
			}
			float fadeoutAlpha = fadeoutSecondsRemaining / fadeoutSeconds;
#if HAS_VECTOR_INT
			skeletonRenderTexture.color.a = fadeoutAlpha;
#else
			Debug.LogError("The SkeletonRenderTexture component requires Unity 2017.2 or newer.");
#endif
		}
	}
}