92 lines
2.2 KiB
Plaintext
92 lines
2.2 KiB
Plaintext
Shader "MY/MotionShadow"
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{
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Properties
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{
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_MainTex("Texture", 2D) = "white" {}
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_BlurSize("BlurSize", Range(0.01, 0.99)) = 0.9
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_Offset("xy = uv zw = motion",Vector) = (0,0,0,0)
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_Brightness("Brightness", Range(0,10)) = 1
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_Flash("Flash", Range(0,1)) = 1
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_Alpha("Alpha",Range(0,1)) = 1
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}
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SubShader
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{
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Tags{ "RenderType" = "Opaque" }
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ZTest Off
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cull Off
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ZWrite Off
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Blend SrcAlpha OneMinusSrcAlpha
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Pass
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{
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Name "Main"
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CGPROGRAM
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#pragma vertex vert
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#pragma fragment frag
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#include "UnityCG.cginc"
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struct appdata {
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float4 vertex:POSITION;
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float2 uv:TEXCOORD0;
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};
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struct v2f
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{
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float4 pos:SV_POSITION;
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float2 uv:TEXCOORD0;
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};
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sampler2D _MainTex;
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half4 _Offset;
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half _BlurSize;
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half _Brightness;
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//half _Saturation;
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//half _Contrast;
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half _Flash;
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half _Alpha;
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v2f vert(appdata v)
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{
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v2f o;
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o.pos = UnityObjectToClipPos(v.vertex);
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o.uv = v.uv + _Offset.xy;
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return o;
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}
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fixed4 frag(v2f i) : SV_Target
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{
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fixed4 col = tex2D(_MainTex, i.uv);
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//降低中心人物的运动模糊start
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float r = length((i.uv.x - _Offset.z, i.uv.y - _Offset.w));
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float a = _BlurSize * pow((1 - r + 0.01), 2);
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col.a = max(a, 1 - _BlurSize);
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//降低中心人物的运动模糊end
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//亮度计算直接叠加
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half3 color = col.rgb*_Brightness;
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////饱和度和灰度有关，先计算最低灰度系数下的图像，随后对原始的图像进行插值操作
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//fixed3 gray = fixed3(0.2125, 0.7154, 0.0721);
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////点积得到最低灰度值，构成最低灰度图像
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//fixed minGray = dot(gray, col.rgb);
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//fixed3 grayColor = fixed3(minGray, minGray, minGray);
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////对灰度图像和原始图像插值操作以得到最终系数的显示图像
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//color = lerp(grayColor, color, _Saturation);
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//对比度效果类似，先计算最低对比度图像，即(0.5,0.5,0.5)，随后插值操作
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fixed3 flash = fixed3(1, 1, 1);
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color = lerp(color, flash, _Flash);
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////得到所有处理完成后的图像颜色，但alpha保持不变
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return fixed4(color, col.a * _Alpha);
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}
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ENDCG
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}
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}
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}
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