Unity 2D SpriteRenderer filled Shader实现

最近遇到个需求需要将2D图片SpriteRenderer支持类似UGUI的Image Filled填充功能，搜了下百度居然搜不到(=_=)，然后就自己研究了下Shader，下边直接上代码

目前只支持水平和垂直方向的fill填充，暂时不需要角度填充，所以这里就懒得加了，后面有机会补上角度填充功能

Shader "Sprite/Filled"
{Properties{[PerRendererData] _MainTex ("Sprite Texture", 2D) = "white" {}[MaterialToggle] PixelSnap ("Pixel snap", Float) = 0[HideInInspector] _RendererColor ("RendererColor", Color) = (1,1,1,1)[HideInInspector] _Flip ("Flip", Vector) = (1,1,1,1)[PerRendererData] _AlphaTex ("External Alpha", 2D) = "white" {}[PerRendererData] _EnableExternalAlpha ("Enable External Alpha", Float) = 0_Color ("Tint", Color) = (1,1,1,1)[Enum(Horizontal, 0, Vertical, 1)]_FillType ("FillType", Float) = 0_FillAmount ("FillAmount", Range(0,1)) = 1[Toggle]_FillFlip ("FillFlip", Float) = 0}SubShader{Tags{"Queue"="Transparent""IgnoreProjector"="True""RenderType"="Transparent""PreviewType"="Plane""CanUseSpriteAtlas"="True"}Cull OffLighting OffZWrite OffBlend One OneMinusSrcAlphaPass{CGPROGRAM#pragma vertex SpriteVert// #pragma fragment SpriteFrag#pragma fragment Frag#pragma target 2.0#pragma multi_compile_instancing#pragma multi_compile_local _ PIXELSNAP_ON#pragma multi_compile _ ETC1_EXTERNAL_ALPHA#include "UnitySprites.cginc"float _FillType;fixed _FillAmount;fixed _FillFlip;fixed4 Frag(v2f IN) : SV_Target{fixed4 col = SampleSpriteTexture (IN.texcoord) * IN.color;//计算fillfloat uvValue = lerp(IN.texcoord.x, IN.texcoord.y, sign(saturate(_FillType)));float fValue1 = lerp(uvValue, _FillAmount, sign(saturate(_FillFlip)));float fValue2 = lerp(_FillAmount, uvValue, sign(saturate(_FillFlip)));col.a *= step(fValue1, fValue2);//endcol.rgb *= col.a;return col;}ENDCG}}
}

Inspector面板视图

C#调用

    /// <summary>/// SetSpriteRendererFill/// </summary>/// <param name="obj"></param>/// <param name="fillAmount"> 0-1 </param>/// <param name="fillType"> 0 or 1 (0:Horizaontal, 1:Vertical) </param>/// <param name="fillFlip"> 翻转 0 or 1 </param>public static void SetSpriteRendererFill(GameObject obj, float fillAmount, float fillType = 0, float fillFlip = 0){SpriteRenderer sr = obj.GetComponent<SpriteRenderer>();if (sr == null) return;Material mat = sr.material;if (mat == null || mat.name != "SpriteToFilled") return;fillType = Mathf.Clamp01(fillType);fillAmount = Mathf.Clamp01(fillAmount);mat.SetFloat("_FillType", fillType);mat.SetFloat("_FillAmount", fillAmount);mat.SetFloat("_FillFlip", fillFlip);}