/// <summary>
/// MIT License - Copyright(c) 2019 Ugo Belfiore
/// </summary>

using UnityEngine;

namespace PerspectiveSwitcher
{
    public static class ExtMatrix
    {
        /// <summary>
        /// apply a lerp between the 2 matrix by time
        /// </summary>
        /// <returns>Lerped matrix</returns>
        public static Matrix4x4 MatrixLerp(Matrix4x4 from, Matrix4x4 to, float time)
        {
            Matrix4x4 ret = new Matrix4x4();
            for (int i = 0; i < 16; i++)
                ret[i] = Mathf.Lerp(from[i], to[i], time);
            return ret;
        }

        /// <summary>
        /// get an Orthographic matrix
        /// </summary>
        /// <param name="aspect">aspect ratio</param>
        /// <param name="orthographicSize">size of the orthigraphic projection</param>
        /// <param name="nearClippingPlane">near</param>
        /// <param name="farClippingPlane">far</param>
        /// <returns>Orthographic matrix</returns>
        public static Matrix4x4 GetMatrixOrthographic(float aspect, float orthographicSize, float nearClippingPlane, float farClippingPlane)
        {
            return (Matrix4x4.Ortho(-orthographicSize * aspect, orthographicSize * aspect, -orthographicSize, orthographicSize, nearClippingPlane, farClippingPlane));
        }

        /// <summary>
        /// get an Perspective matrix
        /// </summary>
        /// <param name="aspect">aspect ratio</param>
        /// <param name="fieldOfView">field Of View of the camera</param>
        /// <param name="nearClippingPlane">near</param>
        /// <param name="farClippingPlane">far</param>
        /// <returns>Perspective matrix</returns>
        public static Matrix4x4 GetMatrixPerspective(float aspect, float fieldOfView, float nearClippingPlane, float farClippingPlane)
        {
            return (Matrix4x4.Perspective(fieldOfView, aspect, nearClippingPlane, farClippingPlane));
        }
    }
}