ScrollDetailTexture

using UnityEngine;
using UnityEngine.UI;


[RequireComponent(typeof(Image))]
public class ScrollDetailTexture : MonoBehaviour
{
public bool uniqueMaterial = false;
public Vector2 scrollPerSecond = Vector2.zero;

Matrix4x4 m_Matrix;
Material mCopy;
Material mOriginal;
Image mSprite;
Material m_Mat;

void OnEnable ()
{
mSprite = GetComponent<Image>();
mOriginal = mSprite.material;

if (uniqueMaterial && mSprite.material != null)
{
mCopy = new Material(mOriginal);
mCopy.name = "Copy of " + mOriginal.name;
mCopy.hideFlags = HideFlags.DontSave;
mSprite.material = mCopy;
}
}

void OnDisable ()
{
if (mCopy != null)
{
mSprite.material = mOriginal;
if (Application.isEditor)
UnityEngine.Object.DestroyImmediate(mCopy);
else
UnityEngine.Object.Destroy(mCopy);
mCopy = null;
}
mOriginal = null;
}

void Update ()
{
Material mat = (mCopy != null) ? mCopy : mOriginal;

if (mat != null)
{
Texture tex = mat.GetTexture("_DetailTex");

if (tex != null)
{
mat.SetTextureOffset("_DetailTex", scrollPerSecond * Time.time);

// TODO: It would be better to add support for MaterialBlocks on UIRenderer,
// because currently only one Update() function's matrix can be active at a time.
// With material block properties, the batching would be correctly broken up instead,
// and would work with multiple widgets using this detail shader.
}
}
}
}