Unity Texture Handling

Will explain

• 2D, 3D, Cube, 2D Array, Atlas, Sprite Sheet

• Create

• Scale

• Compress Editor, Runtime

• Save

• Load

[MenuItem("CONTEXT/RenderTexture/Load from Texture")]
public static void Load_FromTexture()
	{
		if (!(Selection.activeObject is RenderTexture)) return;
		var l_RT = (RenderTexture)Selection.activeObject;

		// Show OpenFilePanel wilth last Loaded Path & File Name
		var l_LoadPath = EditorPrefs.GetString("RT_EXT_LoadPath", Application.dataPath + "\\Textures");

		var m_FileName = EditorPrefs.GetString("RT_EXT_FileName", "TexMix_" + Time.time);

		var l_Path = EditorUtility.OpenFilePanel("Load Splatmap", l_LoadPath + m_FileName, "png");

		if (string.IsNullOrEmpty(l_Path)) return;

		EditorPrefs.SetString("RT_EXT_LoadPath", l_Path.Remove(l_Path.LastIndexOf('/') + 1));

		EditorPrefs.SetString("RT_EXT_FileName", l_Path.Remove(0, l_Path.LastIndexOf('/') + 1));

		var l_RelativePath = l_Path.Replace(Application.dataPath, "Assets");

		var l_Tex = (Texture2D)AssetDatabase.LoadAssetAtPath(l_RelativePath, typeof(Texture2D));

		Graphics.Blit(l_Tex, l_RT);

	}

	[MenuItem("CONTEXT/RenderTexture/Save as File")]

	public static void Save_AsFile()

	{

		if (!(Selection.activeObject is RenderTexture)) return;

		var l_RT = (RenderTexture)Selection.activeObject;

		// Show SaveFilePanel wilth last Loaded Path & File Name

		var m_SavePath = EditorPrefs.GetString("RT_EXT_SavePath", Application.dataPath + "\\Textures");

		var m_FileName = EditorPrefs.GetString("RT_EXT_FileName", "TexMix_" + Time.time);

		var l_Path = EditorUtility.SaveFilePanel("Save Splatmap", m_SavePath, m_FileName, "png");

		if (string.IsNullOrEmpty(l_Path)) return;

		EditorPrefs.SetString("RT_EXT_SavePath", l_Path.Remove(l_Path.LastIndexOf('/') + 1));

		EditorPrefs.SetString("RT_EXT_FileName", l_Path.Remove(0, l_Path.LastIndexOf('/') + 1));

		var l_OldTarget = RenderTexture.active;

		RenderTexture.active = l_RT;

		Texture2D l_Tex = new Texture2D(l_RT.width, l_RT.height, TextureFormat.ARGB32, false, !l_RT.sRGB);

		l_Tex.ReadPixels(new Rect(0, 0, l_RT.width, l_RT.height), 0, 0);

		l_Tex.Apply();

		RenderTexture.active = l_OldTarget;

		File.WriteAllBytes(l_Path, l_Tex.EncodeToPNG());

	}

[MenuItem("CONTEXT/TextureImporter/Generate Point MipMaps")]

	public static void Generate_PointMipMaps()

	{

		if (!(Selection.activeObject is Texture2D)) return;

		var l_SelTex2D = (Texture2D)Selection.activeObject;

		var l_Tex2D = new Texture2D(l_SelTex2D.width, l_SelTex2D.height, l_SelTex2D.format, l_SelTex2D.mipmapCount, true);

		if (!l_Tex2D.isReadable)

		{

			Debug.LogError("Unable to Read Pixels, Please set Enable Read/Write");

			return;

		}

		int l_Width = l_Tex2D.width;

		int l_Height = l_Tex2D.height;

		int l_MipCount = l_Tex2D.mipmapCount;

		var l_Colors = l_SelTex2D.GetPixels32();

		for (int i = 0; i < l_MipCount; i++)

		{

			int l_ResDivisor = (int)Math.Pow(2, i);

			int l_MipWidth = Mathf.Max(1, l_Width / l_ResDivisor);

			int l_MipHeight = Mathf.Max(1, l_Height / l_ResDivisor);

			int l_MipPixels = l_MipWidth * l_MipHeight;

			var l_MipCols = new Color32[l_MipPixels];

			for (int v = 0; v < l_MipHeight; v++)

			{

				for (int u = 0; u < l_MipWidth; u++)

				{

					int l_SrcIdx = v * l_Width * l_ResDivisor + u * l_ResDivisor;

					int l_DstIdx = v * l_MipWidth + u;

					l_MipCols[l_DstIdx] = l_Colors[l_SrcIdx];

				}

			}

			l_Tex2D.SetPixels32(l_MipCols, i);

		}

		l_Tex2D.Apply(false, false);

		EditorUtility.CompressTexture(l_Tex2D, TextureFormat.ASTC_6x6, TextureCompressionQuality.Best);

		var m_SavePath = EditorPrefs.GetString("TEX_EXT_SavePath", Application.dataPath + "\\Textures");

		var m_FileName = EditorPrefs.GetString("TEX_EXT_FileName", "TexMix_" + Time.time);

		var l_Path = EditorUtility.SaveFilePanel("Save PointMipMaps", m_SavePath, m_FileName, "asset");

		if (string.IsNullOrEmpty(l_Path)) return;

		EditorPrefs.SetString("TEX_EXT_SavePath", l_Path.Remove(l_Path.LastIndexOf('/') + 1));

		EditorPrefs.SetString("TEX_EXT_FileName", l_Path.Remove(0, l_Path.LastIndexOf('/') + 1));

		AssetDatabase.CreateAsset(l_Tex2D, l_Path);		

	}