using System;
using UnityEngine;

[ExecuteInEditMode]
public class TestSceneViewShaderHelper : MonoBehaviour
{
#if UNITY_EDITOR
	private int _isSceneViewID = Shader.PropertyToID("_IsSceneView");

	public void OnEnable()
	{
		Camera.onPreRender += SetIfSceneViewCamera;
	}

	public void OnDisable()
	{
		Camera.onPreRender -= SetIfSceneViewCamera;
	}

	public void SetIfSceneViewCamera(Camera cam)
	{
		// Scene View camera is named "SceneCamera"
		if (cam.gameObject.name == "SceneCamera")
		{
			Shader.EnableKeyword("SCENE_VIEW");
			Shader.SetGlobalFloat(_isSceneViewID, 1f);
		}
		// Inspector preview for materials, models, and prefabs is named "Preview Scene Camera"
		// else if (cam.gameObject.name == "Preview Scene Camera")
		// {
		//     Shader.EnableKeyword("SCENE_VIEW");
		//     Shader.SetGlobalFloat(_isSceneViewID, 2f);
		// }
		// Otherwise this is a game view or other user camera
		else
		{
			Shader.DisableKeyword("SCENE_VIEW");
			Shader.SetGlobalFloat(_isSceneViewID, 0f);
		} 

		// You can double check the camera names if something breaks in the future
		// Debug.Log(cam);
	}
#endif
}