Shader "UI/LogoFlicker" {
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Properties {
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_FlashColor ("Flash Color", Color) = (1,1,1,1)
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_Angle ("Flash Angle", Range(0, 180)) = 45
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_Width ("Flash Width", Range(0, 1)) = 0.2
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_LoopTime ("Loop Time", Float) = 1
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_Interval ("Time Interval", Float) = 3
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[PerRendererData] _MainTex("Sprite Texture", 2D) = "white" {}
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_Color("Tint", Color) = (1,1,1,1)
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_StencilComp("Stencil Comparison", Float) = 8
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_Stencil("Stencil ID", Float) = 0
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_StencilOp("Stencil Operation", Float) = 0
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_StencilWriteMask("Stencil Write Mask", Float) = 255
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_StencilReadMask("Stencil Read Mask", Float) = 255
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_ColorMask("Color Mask", Float) = 15
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}
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SubShader
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{
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Tags
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{
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"Queue" = "Transparent"
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"IgnoreProjector" = "True"
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"RenderType" = "Transparent"
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"PreviewType" = "Plane"
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"CanUseSpriteAtlas" = "True"
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}
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Stencil
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{
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Ref[_Stencil]
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Comp[_StencilComp]
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Pass[_StencilOp]
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ReadMask[_StencilReadMask]
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WriteMask[_StencilWriteMask]
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}
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LOD 200
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Blend SrcAlpha OneMinusSrcAlpha //指定alphaBlend
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CGPROGRAM
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#pragma surface surf Lambert alpha exclude_path:prepass noforwardadd
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// #pragma target 3.0
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sampler2D _MainTex;
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float4 _FlashColor;
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float _Angle;
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float _Width;
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float _LoopTime;
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float _Interval;
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struct Input
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{
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half2 uv_MainTex;
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};
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float inFlash(half2 uv)
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{
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float brightness = 0;
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float angleInRad = 0.0174444 * _Angle;
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float tanInverseInRad = 1.0 / tan(angleInRad);
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float currentTime = _Time.y;
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float totalTime = _Interval + _LoopTime;
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float currentTurnStartTime = (int)((currentTime / totalTime)) * totalTime;
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float currentTurnTimePassed = currentTime - currentTurnStartTime - _Interval;
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bool onLeft = (tanInverseInRad > 0);
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float xBottomFarLeft = onLeft? 0.0 : tanInverseInRad;
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float xBottomFarRight = onLeft? (1.0 + tanInverseInRad) : 1.0;
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float percent = currentTurnTimePassed / _LoopTime;
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float xBottomRightBound = xBottomFarLeft + percent * (xBottomFarRight - xBottomFarLeft);
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float xBottomLeftBound = xBottomRightBound - _Width;
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float xProj = uv.x + uv.y * tanInverseInRad;
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if(xProj > xBottomLeftBound && xProj < xBottomRightBound)
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{
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brightness = 1.0 - abs(2.0 * xProj - (xBottomLeftBound + xBottomRightBound)) / _Width;
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}
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return brightness;
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}
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void surf (Input IN, inout SurfaceOutput o)
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{
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half4 texCol = tex2D(_MainTex, IN.uv_MainTex);
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float brightness = inFlash(IN.uv_MainTex);
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o.Emission = texCol.rgb + _FlashColor.rgb * brightness;//改为输出Emission，不受光影响
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o.Alpha = texCol.a;
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}
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ENDCG
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}
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FallBack "Diffuse"
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}
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