91 lines
2.8 KiB
C#
91 lines
2.8 KiB
C#
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// KlakSpout - Spout video frame sharing plugin for Unity
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// https://github.com/keijiro/KlakSpout
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using UnityEngine;
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using UnityEditor;
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using System;
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using System.Collections.Generic;
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namespace Klak.Spout
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{
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static class MaterialPropertySelector
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{
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#region Public method
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// Material property drop-down list
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public static void DropdownList(
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SerializedProperty rendererProperty,
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SerializedProperty materialProperty
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)
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{
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// Try retrieving the target shader.
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var shader = RetrieveTargetShader(rendererProperty);
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// Abandon the current value if it failed to get a shader.
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if (shader == null)
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{
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materialProperty.stringValue = "";
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return;
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}
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// Cache property names found in the target shader.
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CachePropertyNames(shader);
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// Abandon the current value if there is no property candidate.
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if (_propertyNames.Length == 0)
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{
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materialProperty.stringValue = "";
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return;
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}
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// Show the dropdown list.
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var index = Array.IndexOf(_propertyNames, materialProperty.stringValue);
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var newIndex = EditorGUILayout.Popup("Property", index, _propertyNames);
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// Update the serialized property if the selection was changed.
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if (index != newIndex) materialProperty.stringValue = _propertyNames[newIndex];
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}
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#endregion
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#region Private members
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static string[] _propertyNames; // Property name list
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static Shader _cachedShader; // Shader used to cache the name list
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// Retrieve a shader from a given renderer.
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static Shader RetrieveTargetShader(SerializedProperty rendererProperty)
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{
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var renderer = rendererProperty.objectReferenceValue as Renderer;
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if (renderer == null) return null;
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var material = renderer.sharedMaterial;
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if (material == null) return null;
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return material.shader;
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}
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// Cache property names provided within a specified shader.
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static void CachePropertyNames(Shader shader)
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{
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// Exit early when the shader is same to the cached one.
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if (shader == _cachedShader) return;
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var temp = new List<string>();
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var count = ShaderUtil.GetPropertyCount(shader);
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for (var i = 0; i < count; i++)
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{
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var propType = ShaderUtil.GetPropertyType(shader, i);
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if (propType == ShaderUtil.ShaderPropertyType.TexEnv)
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temp.Add(ShaderUtil.GetPropertyName(shader, i));
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}
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_propertyNames = temp.ToArray();
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_cachedShader = shader;
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}
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#endregion
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}
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}
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