using UnityEngine;
using System.Collections;

/// <summary>
/// 渲染需要广泛那部分的图
/// </summary>
public class RenderBloomTexture : MonoBehaviour
{
    /// <summary>
    /// 主摄像机
    /// </summary>
    public Camera m_FollowCamera;

    /// <summary>
    /// 渲染需要泛光的摄像机
    /// </summary>
    private Camera m_Camera;

    /// <summary>
    /// 替换shader
    /// </summary>
    private Shader replaceShader = null;

    [SerializeField]
    internal string render_tag = "RenderType";

    void Start()
    {
        m_Camera = GetComponent<Camera>();
        //摄像机背景要设置为黑色
        // m_Camera.enabled = false;
        m_Camera.clearFlags = CameraClearFlags.SolidColor;
        m_Camera.backgroundColor = Color.black;
        UpdateCamera();
        UpdateCameraSetting();
    }

    void LateUpdate()
    {
        // UpdateCamera();
        //调用渲染
        if (replaceShader != null)
            m_Camera.RenderWithShader(replaceShader, render_tag);
        else
            Debug.Log("Error of replace shader");
    }

    void UpdateCamera()
    {
        transform.position = m_FollowCamera.transform.position;
        transform.rotation = m_FollowCamera.transform.rotation;
    }

    void UpdateCameraSetting()
    {
        m_Camera.orthographic = m_FollowCamera.orthographic;
        m_Camera.orthographicSize = m_FollowCamera.orthographicSize;
        m_Camera.nearClipPlane = m_FollowCamera.nearClipPlane;
        m_Camera.farClipPlane = m_FollowCamera.farClipPlane;
        m_Camera.fieldOfView = m_FollowCamera.fieldOfView;
    }

    public void ChangeRenderTag(string tag)
    {
        render_tag = tag;
    }

    public void SetRenderShader(Shader shader)
    {
        replaceShader = shader;
    }
}