using System.Collections;
using System.Collections.Generic;
using UnityEngine;

// 专门用来渲染character的相机，用来做特效
[RequireComponent(typeof(Camera))]
public class UnitCamera : SingletonMB<UnitCamera>
{
	PCController pc { get { return UnitManager.Instance.pc; } }

	Camera m_Camera;

	private void OnEnable()
	{
		m_Camera = GetComponent<Camera>();
        m_Camera.enabled = false;
    }

    // 手动渲染
    public void Render()
    {
        m_Camera.Render();
    }

    // 这里要用OnPreCull,不能是OnPreRender，因为设置了可见性，OnPreRender是在可见性剔除之后
    void OnPreCull() 
	{
		if (pc == null)
			return;
        if (pc.unitImageEffect == null || pc.unitImageEffect.effects.Count == 0)
            return;
		if (m_Camera == null)
			return;

		Vector3 pos = transform.position;
		transform.position = new Vector3(pc.center.x, pc.center.y, pos.z);

		float dz = Mathf.Abs(pos.z - pc.center.z);
		float fov = 2 * Mathf.Atan2(pc.unitDetail.snapshotBound / 2, dz) * Mathf.Rad2Deg;

		m_Camera.fieldOfView = fov;

        // 开启unit的渲染
        pc.unitRender.SetVisibilityInAllCameras(true);
    }

    void OnPostRender()
    {
        if (pc.unitImageEffect == null || pc.unitImageEffect.effects.Count == 0)
            return;

        pc.unitRender.SetVisibilityInAllCameras(false);
    }

}