using System;
using UnityEngine;

[Serializable]
public class RenderTextureAlpha : MonoBehaviour
{
	public float alpha;

	private Material mat;

	public RenderTextureAlpha()
	{
		alpha = 1f;
	}

	public virtual void Start()
	{
		mat = new Material("Shader \"Hidden/Clear Alpha\" {" + "Properties { _Alpha(\"Alpha\", Float)=1.0 } " + "SubShader {" + "    Pass {" + "        ZTest Always Cull Off ZWrite Off" + "        ColorMask A" + "        SetTexture [_Dummy] {" + "            constantColor(0,0,0,[_Alpha]) combine constant }" + "    }" + "}" + "}");
	}

	public virtual void OnPostRender()
	{
		GL.PushMatrix();
		GL.LoadOrtho();
		mat.SetFloat("_Alpha", alpha);
		mat.SetPass(0);
		GL.Begin(7);
		GL.Vertex3(0f, 0f, 0.1f);
		GL.Vertex3(1f, 0f, 0.1f);
		GL.Vertex3(1f, 1f, 0.1f);
		GL.Vertex3(0f, 1f, 0.1f);
		GL.End();
		GL.PopMatrix();
	}

	public virtual void Main()
	{
	}
}