// Unity built-in shader source. Copyright (c) 2016 Unity Technologies. MIT license (see license.txt) Shader "Custom/FlowLightShader" { Properties { [PerRendererData] _MainTex ("Sprite Texture", 2D) = "white" {} _Color ("Tint", Color) = (1,1,1,1) _StencilComp ("Stencil Comparison", Float) = 8 _Stencil ("Stencil ID", Float) = 0 _StencilOp ("Stencil Operation", Float) = 0 _StencilWriteMask ("Stencil Write Mask", Float) = 255 _StencilReadMask ("Stencil Read Mask", Float) = 255 _ColorMask ("Color Mask", Float) = 15 //ADD--------- lightTime("Light Time", Float) = 0.6 thick("Light Thick", Float) = 0.3 nextTime("Next Light Time", Float) = 2 angle("Light Angle", int) = 45 //ADD--------- [Toggle(UNITY_UI_ALPHACLIP)] _UseUIAlphaClip ("Use Alpha Clip", Float) = 0 } SubShader { Tags { "Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent" "PreviewType"="Plane" "CanUseSpriteAtlas"="True" } Stencil { Ref [_Stencil] Comp [_StencilComp] Pass [_StencilOp] ReadMask [_StencilReadMask] WriteMask [_StencilWriteMask] } Cull Off Lighting Off ZWrite Off ZTest [unity_GUIZTestMode] Blend SrcAlpha OneMinusSrcAlpha ColorMask [_ColorMask] Pass { Name "Default" CGPROGRAM #pragma vertex vert #pragma fragment frag #pragma target 2.0 #include "UnityCG.cginc" #include "UnityUI.cginc" #pragma multi_compile_local _ UNITY_UI_CLIP_RECT #pragma multi_compile_local _ UNITY_UI_ALPHACLIP struct appdata_t { float4 vertex : POSITION; float4 color : COLOR; float2 texcoord : TEXCOORD0; UNITY_VERTEX_INPUT_INSTANCE_ID }; struct v2f { float4 vertex : SV_POSITION; fixed4 color : COLOR; float2 texcoord : TEXCOORD0; float4 worldPosition : TEXCOORD1; float4 mask : TEXCOORD2; UNITY_VERTEX_OUTPUT_STEREO }; sampler2D _MainTex; fixed4 _Color; fixed4 _TextureSampleAdd; float4 _ClipRect; float4 _MainTex_ST; float _UIMaskSoftnessX; float _UIMaskSoftnessY; //ADD--------- half lightTime; int angle; float thick; float nextTime; //ADD--------- v2f vert(appdata_t v) { v2f OUT; UNITY_SETUP_INSTANCE_ID(v); UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(OUT); float4 vPosition = UnityObjectToClipPos(v.vertex); OUT.worldPosition = v.vertex; OUT.vertex = vPosition; float2 pixelSize = vPosition.w; pixelSize /= float2(1, 1) * abs(mul((float2x2)UNITY_MATRIX_P, _ScreenParams.xy)); float4 clampedRect = clamp(_ClipRect, -2e10, 2e10); float2 maskUV = (v.vertex.xy - clampedRect.xy) / (clampedRect.zw - clampedRect.xy); OUT.texcoord = TRANSFORM_TEX(v.texcoord.xy, _MainTex); OUT.mask = float4(v.vertex.xy * 2 - clampedRect.xy - clampedRect.zw, 0.25 / (0.25 * half2(_UIMaskSoftnessX, _UIMaskSoftnessY) + abs(pixelSize.xy))); OUT.color = v.color * _Color; return OUT; } fixed4 frag(v2f IN) : SV_Target { half4 color = (tex2D(_MainTex, IN.texcoord) + _TextureSampleAdd); //ADD--------- fixed currentTimePassed = fmod(_Time.y, lightTime + nextTime); fixed x = currentTimePassed / lightTime;//0-1为扫光时间 >1为等待时间 fixed tanx = tan(0.0174*angle);// uv-y/uv-x 0.0174为3.14/180 x += (x-1)/tanx;//保证能从头扫到尾 fixed x1 = IN.texcoord.y /tanx + x;//用uv-y来计算倾斜的uv-x fixed x2 = x1 + thick;//范围 if(IN.texcoord.x > x1 && IN.texcoord.x < x2) { fixed dis = abs(IN.texcoord.x-(x1+x2)/2);//距离扫光当前x中心点的距离 dis = 1-dis*2/thick;//越中心越大 half ca = color.a; color += color*(1.4*dis);//颜色加强 color.a = ca; } //ADD--------- #ifdef UNITY_UI_CLIP_RECT half2 m = saturate((_ClipRect.zw - _ClipRect.xy - abs(IN.mask.xy)) * IN.mask.zw); color.a *= m.x * m.y; #endif #ifdef UNITY_UI_ALPHACLIP clip (color.a - 0.001); #endif return color; } ENDCG } } }
在官网对应的unity版本下下载build in shaders,找到UI-Default.shader,添加标志了ADD---------的代码,创建新的材质,赋值给Image的材质就可以了。