UnityEditor.EditorGUILayout.IntPopup C# (CSharp) Method

        public static int IntPopup(GUIContent label, int selectedValue, GUIContent[] displayedOptions, int[] optionValues, params GUILayoutOption[] options)
        {
            return IntPopup(label, selectedValue, displayedOptions, optionValues, EditorStyles.popup, options);
        }

        public override void OnInspectorGUI()
        {
            if (m_Images == null)
            {
                InitTexturesFromCubemap();
            }

            EditorGUIUtility.labelWidth = 50;
            var c = target as Cubemap;

            if (c == null)
            {
                return;
            }

            GUILayout.BeginVertical();

            GUILayout.BeginHorizontal();
            ShowFace("Right\n(+X)", CubemapFace.PositiveX);
            ShowFace("Left\n(-X)", CubemapFace.NegativeX);
            GUILayout.EndHorizontal();

            GUILayout.BeginHorizontal();
            ShowFace("Top\n(+Y)", CubemapFace.PositiveY);
            ShowFace("Bottom\n(-Y)", CubemapFace.NegativeY);
            GUILayout.EndHorizontal();

            GUILayout.BeginHorizontal();
            ShowFace("Front\n(+Z)", CubemapFace.PositiveZ);
            ShowFace("Back\n(-Z)", CubemapFace.NegativeZ);
            GUILayout.EndHorizontal();

            GUILayout.EndVertical();

            EditorGUIUtility.labelWidth = 0;

            EditorGUILayout.Space();

            EditorGUI.BeginChangeCheck();

            EditorGUILayout.HelpBox("Lowering face size is a destructive operation, you might need to re-assign the textures later to fix resolution issues. It's preferable to use Cubemap texture import type instead of Legacy Cubemap assets.", MessageType.Warning);
            int faceSize = TextureUtil.GetGPUWidth(c);

            faceSize = EditorGUILayout.IntPopup("Face size", faceSize, kSizes, kSizesValues);

            int  mipMaps   = TextureUtil.GetMipmapCount(c);
            bool useMipMap = EditorGUILayout.Toggle("MipMaps", mipMaps > 1);

            bool streamingMipmaps = TextureUtil.GetCubemapStreamingMipmaps(c);

            if (useMipMap)
            {
                streamingMipmaps = EditorGUILayout.Toggle(EditorGUIUtility.TrTextContent("Streaming Mip Maps", "Don't load image data immediately, but wait till image data is requested from script."), streamingMipmaps);
            }

            bool linear = TextureUtil.GetLinearSampled(c);

            linear = EditorGUILayout.Toggle("Linear", linear);

            bool readable = TextureUtil.IsCubemapReadable(c);

            readable = EditorGUILayout.Toggle("Readable", readable);

            if (EditorGUI.EndChangeCheck())
            {
                // reformat the cubemap
                if (TextureUtil.ReformatCubemap(ref c, faceSize, faceSize, c.format, useMipMap, linear))
                {
                    InitTexturesFromCubemap();
                }

                TextureUtil.MarkCubemapReadable(c, readable);
                TextureUtil.SetCubemapStreamingMipmaps(c, streamingMipmaps);
                c.Apply();
            }
        }