using UnityEngine;

//提供一个后处理的基类，主要功能在于直接通过Inspector面板拖入shader，生成shader对应的材质
public class PostEffectsBase : MonoBehaviour
{

    //Inspector面板上直接拖入
    public Shader shader = null;
    private Material _material = null;

    /// <summary>
    /// 检测需要渲染的Shader可用性，然后返回使用了该shader的material
    /// </summary>
    /// <param name="shader">指定shader</param>
    /// <param name="material">创建的材质</param>
    /// <returns>得到指定shader的材质</returns>
    protected Material CheckShaderAndCreateMaterial(Shader shader, ref Material material)
    {
        if (shader == null || !shader.isSupported)
            return null;

        if (material && material.shader == shader)
            return material;

        material = new Material(shader);
        material.hideFlags = HideFlags.DontSave;
        return material;
    }
}