[UnityShader基础]07.MaterialPropertyDrawer

参考链接：

https://blog.csdn.net/e295166319/article/details/60141677

https://docs.unity3d.com/ScriptReference/MaterialPropertyDrawer.html

1.Toggle

a.[Toggle] _Invert ("Invert?", Float) = 0

勾选时，表示使shader关键字_INVERT_ON生效，关键字格式为：name_ON(全部大写)

取消勾选时，表示使对应的关键字失效

要注意的是，这个关键字是要去定义的，否则Toggle无效

 Shader "Custom/TestMaterialProperty"
 {
     Properties
     {
         [Toggle] _Invert ("Invert?", Float) =
     }
     SubShader
     {
         Pass
         {
             CGPROGRAM
             #pragma vertex vert
             #pragma fragment frag
             #pragma multi_compile __ _INVERT_ON

             #include "UnityCG.cginc"

             struct appdata
             {
                 float4 vertex : POSITION;
             };

             struct v2f
             {
                 float4 vertex : SV_POSITION;
             };

             v2f vert (appdata v)
             {
                 v2f o;
                 o.vertex = mul(UNITY_MATRIX_MVP, v.vertex);
                 return o;
             }

             fixed4 frag (v2f i) : SV_Target
             {
                 fixed4 col = fixed4(, , , );
                 #ifdef _INVERT_ON
                 col = fixed4(, , , );
                 #endif
                 return col;
             }
             ENDCG
         }
     }
 }

效果如下，来回勾选就可以看到颜色在切换了

b.[Toggle(ENABLE_FANCY)] _Fancy ("Fancy?", Float) = 0

勾选时，表示使shader关键字ENABLE_FANCY生效

取消勾选时，表示使对应的关键字失效

 Shader "Custom/TestMaterialProperty"
 {
     Properties
     {
         [Toggle(ENABLE_FANCY)] _Fancy ("Fancy?", Float) =
     }
     SubShader
     {
         Pass
         {
             CGPROGRAM
             #pragma vertex vert
             #pragma fragment frag
             #pragma multi_compile __ ENABLE_FANCY

             #include "UnityCG.cginc"

             struct appdata
             {
                 float4 vertex : POSITION;
             };

             struct v2f
             {
                 float4 vertex : SV_POSITION;
             };

             v2f vert (appdata v)
             {
                 v2f o;
                 o.vertex = mul(UNITY_MATRIX_MVP, v.vertex);
                 return o;
             }

             fixed4 frag (v2f i) : SV_Target
             {
                 fixed4 col = fixed4(, , , );
                 #ifdef ENABLE_FANCY
                 col = fixed4(, , , );
                 #endif
                 return col;
             }
             ENDCG
         }
     }
 }

2.KeywordEnum

[KeywordEnum(None, Add, Multiply)] _Overlay ("Overlay mode", Float) = 0

当选择None时，表示使shader关键字_OVERLAY_NONE生效，关键字格式为：属性名_枚举名(全部大写)

 Shader "Custom/TestMaterialProperty"
 {
     Properties
     {
         [KeywordEnum(None, Add, Multiply)] _Overlay ("Overlay mode", Float) =
     }
     SubShader
     {
         Pass
         {
             CGPROGRAM
             #pragma vertex vert
             #pragma fragment frag
             #pragma multi_compile _OVERLAY_NONE _OVERLAY_ADD _OVERLAY_MULTIPLY

             #include "UnityCG.cginc"

             struct appdata
             {
                 float4 vertex : POSITION;
             };

             struct v2f
             {
                 float4 vertex : SV_POSITION;
             };

             v2f vert (appdata v)
             {
                 v2f o;
                 o.vertex = mul(UNITY_MATRIX_MVP, v.vertex);
                 return o;
             }

             fixed4 frag (v2f i) : SV_Target
             {
                 fixed4 col = fixed4(, , , );
                 #if _OVERLAY_NONE
                     col = fixed4(, , , );
                 #elif _OVERLAY_ADD
                     col = fixed4(, , , );
                 #elif _OVERLAY_MULTIPLY
                     col = fixed4(, , , );
                 #endif
                 return col;
             }
             ENDCG
         }
     }
 }

效果如下，选择不同的选项即显示不同的颜色