ShaderLabのCustomMaterialPropertyDrawerのサンプル（区切り線, Texture2Dの1行表示, foldout）

GatoMaterialPropertyDrawer.cs

using UnityEngine;
using UnityEditor;
using System;

namespace GatoMaterialPropertyDrawer
{
    internal class LineDecorator : MaterialPropertyDrawer
    {
        private float spaceSize;

        public LineDecorator()
        {
            spaceSize = 0;
        }

        public LineDecorator(float spaceSize)
        {
            this.spaceSize = spaceSize;
        }

        public override void OnGUI(Rect position, MaterialProperty prop, GUIContent label, MaterialEditor editor)
        {
            GUILayout.Space(spaceSize);
            GUILayout.Box(string.Empty, GUILayout.ExpandWidth(true), GUILayout.Height(1));
            GUILayout.Space(spaceSize);
        }
    }

    internal class SingleLineTexDrawer : MaterialPropertyDrawer
    {
        public SingleLineTexDrawer() { }

        public override void OnGUI(Rect position, MaterialProperty prop, GUIContent label, MaterialEditor editor)
        {
            editor.TexturePropertySingleLine(label, prop);
        }
    }

    internal class FoldoutDecorator : MaterialPropertyDrawer
    {
        public bool isFoldout = false;
        private bool useIndent = true;
        private string groupKeyword;

        public FoldoutDecorator(string groupKeyword)
        {
            this.groupKeyword = groupKeyword;
        }

        public FoldoutDecorator(string groupKeyword, float isFoldout)
        {
            this.groupKeyword = groupKeyword;
            this.isFoldout = Convert.ToBoolean(isFoldout);
        }

        public override float GetPropertyHeight(MaterialProperty prop, string label, MaterialEditor editor)
        {
            return EditorGUIUtility.singleLineHeight;
        }

        public override void OnGUI(Rect position, MaterialProperty prop, GUIContent label, MaterialEditor editor)
        {
            var style = new GUIStyle("ShurikenModuleTitle");
            style.font = new GUIStyle(EditorStyles.label).font;
            style.border = new RectOffset(15, 7, 4, 4);
            style.fixedHeight = 22;
            style.contentOffset = new Vector2(20f, -2f);

            var rect = new Rect(position.x, position.y, position.width, EditorGUIUtility.singleLineHeight);
            GUI.Box(rect, groupKeyword, style);

            var e = Event.current;

            var toggleRect = new Rect(rect.x + 4f, rect.y + 2f, 13f, 13f);
            if (e.type == EventType.Repaint)
            {
                EditorStyles.foldout.Draw(toggleRect, false, false, isFoldout, false);
            }

            if (e.type == EventType.MouseDown && rect.Contains(e.mousePosition))
            {
                isFoldout = !isFoldout;
                e.Use();
            }

            var material = editor.target as Material;
            material.SetFloat("_IsFoldout"+groupKeyword, Convert.ToSingle(isFoldout));
        }
    }

    internal class FoldoutGroupDrawer : MaterialPropertyDrawer
    {
        private string groupKeyword;

        public FoldoutGroupDrawer(string groupKeyword)
        {
            this.groupKeyword = groupKeyword;
        }

        public override float GetPropertyHeight(MaterialProperty prop, string label, MaterialEditor editor)
        {
            var material = editor.target as Material;
            if (!material.HasProperty("_IsFoldout" + groupKeyword)) return 0f;
            var isFoldout = Convert.ToBoolean(material.GetFloat("_IsFoldout" + groupKeyword));

            if (!isFoldout)
            {
                return 0f;
            }
            else
            {
                return base.GetPropertyHeight(prop, label, editor);
            }
        }

        public override void OnGUI(Rect position, MaterialProperty prop, GUIContent label, MaterialEditor editor)
        {
            var material = editor.target as Material;
            if (!material.HasProperty("_IsFoldout" + groupKeyword)) return;
            var isFoldout = Convert.ToBoolean(material.GetFloat("_IsFoldout" + groupKeyword));

            if (!isFoldout)
            {
                return;
            }
            
            EditorGUI.indentLevel++;
            editor.DefaultShaderProperty(prop, label.text);
            EditorGUI.indentLevel--;
        }
    }
}

PropertyTest.shader

Shader "Unlit/PropertyTest"
{
	Properties
	{
		[SingleLineTex]
		_TestTex ("TestTex", 2D) = "while" {}

		[Line(10)]

		_Color ("Color", Color) = (1, 1, 1, 1)

		[Foldout(Test)]
		[FoldoutGroup(Test)]
		_Color2("Color2", Color) = (1, 1, 1, 1)

		[FoldoutGroup(Test)]
		_MainTex ("Texture", 2D) = "white" {}

		[FoldoutGroup(Test)]
		_FloatValue("Float", Range(0, 1)) = 1

		[Foldout(Test2)]
		[FoldoutGroup(Test2)]
		_Color3("Color3", Color) = (1, 1, 1, 1)
	}
	SubShader
	{
		Tags { "RenderType"="Opaque" }
		LOD 100

		Pass
		{
			CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag
			// make fog work
			#pragma multi_compile_fog
			
			#include "UnityCG.cginc"

			struct appdata
			{
				float4 vertex : POSITION;
				float2 uv : TEXCOORD0;
			};

			struct v2f
			{
				float2 uv : TEXCOORD0;
				UNITY_FOG_COORDS(1)
				float4 vertex : SV_POSITION;
			};

			sampler2D _MainTex;
			float4 _MainTex_ST;
			
			v2f vert (appdata v)
			{
				v2f o;
				o.vertex = UnityObjectToClipPos(v.vertex);
				o.uv = TRANSFORM_TEX(v.uv, _MainTex);
				UNITY_TRANSFER_FOG(o,o.vertex);
				return o;
			}
			
			fixed4 frag (v2f i) : SV_Target
			{
				// sample the texture
				fixed4 col = tex2D(_MainTex, i.uv);
				// apply fog
				UNITY_APPLY_FOG(i.fogCoord, col);
				return col;
			}
			ENDCG
		}
	}
}

z_readme.md

実装機能

• 区切り線 [Line] [Line(上下余白)]
• Texture2Dの1行表示 [SingleLineTex]
• 折りたたむ
  • 最初の要素に　[Foldout(グループ名)]
  • 各要素に [FoldoutGroup(グループ名)]

導入方法

1. Editorフォルダを作成してGatoMaterialPropertyDrawer.csを入れる
2. Shaderコードで[Line]や[SingleLineTex]などを書く（PropertyTest.shaderを参照）

unitypackageの配布

https://drive.google.com/open?id=1EK-FVzLDklNo9kuEqW2mUW9r4l_dVS-U