/// <summary>
/// 设置混合模式
/// <para>effect</para>
/// <para>blendMode</para>
/// </summary>
/// <param name="luaState"></param>
/// <returns></returns>
public static int SetSpriteEffectBlendMode(ILuaState luaState)
{
STGSpriteEffect effect = luaState.ToUserData(-2) as STGSpriteEffect;
eBlendMode blendMode = (eBlendMode)luaState.ToInteger(-1);
effect.SetBlendMode(blendMode);
return(0);
}