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86 linhas
3.2 KiB
86 linhas
3.2 KiB
// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'
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Shader "Unlit/DissolveEffect"
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{
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Properties{
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_Diffuse("Diffuse", Color) = (1,1,1,1)
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_DissolveColor("Dissolve Color", Color) = (0,0,0,0)
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_DissolveEdgeColor("Dissolve Edge Color", Color) = (1,1,1,1)
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_MainTex("Texture", 2D) = "white" {}
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_DissolveMap("DissolveMap", 2D) = "white"{}
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_DissolveThreshold("DissolveThreshold", Range(0,1)) = 0
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_ColorFactor("ColorFactor", Range(0,1)) = 0.7
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_DissolveEdge("DissolveEdge", Range(0,1)) = 0.8
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}
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CGINCLUDE
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#include "Lighting.cginc"
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uniform fixed4 _Diffuse;
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uniform fixed4 _DissolveColor;
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uniform fixed4 _DissolveEdgeColor;
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uniform sampler2D _MainTex;
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uniform float4 _MainTex_ST;
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uniform sampler2D _DissolveMap;
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uniform fixed _DissolveThreshold;
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uniform fixed _ColorFactor;
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uniform fixed _DissolveEdge;
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struct v2f
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{
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half4 pos : SV_POSITION;
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// half3 worldNormal : TEXCOORD0;
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half2 uv : TEXCOORD1;
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};
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v2f vert(appdata_base 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 = TRANSFORM_TEX(v.texcoord, _MainTex);
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//o.worldNormal = mul(v.normal, (float3x3)unity_WorldToObject);
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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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//采样Dissolve Map
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fixed4 dissolveValue = tex2D(_DissolveMap, i.uv);
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//小于阈值的部分直接discard
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if (dissolveValue.r < _DissolveThreshold)
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{
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discard;
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}
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//Diffuse + Ambient光照计算
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//fixed3 worldNormal = normalize(i.worldNormal);
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//fixed3 worldLightDir = normalize(_WorldSpaceLightPos0.xyz);
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//fixed3 lambert = saturate(dot(worldNormal, worldLightDir));
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// fixed3 albedo = lambert * _Diffuse.xyz * _LightColor0.xyz + UNITY_LIGHTMODEL_AMBIENT.xyz;
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fixed3 color = tex2D(_MainTex, i.uv).rgb; //* albedo;
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//优化版本，尽量不在shader中用分支判断的版本,但是代码很难理解啊....
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fixed percentage = _DissolveThreshold / dissolveValue.r;
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//如果当前百分比 - 颜色权重 - 边缘颜色
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fixed lerpEdge = sign(percentage - _ColorFactor - _DissolveEdge);
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//貌似sign返回的值还得saturate一下，否则是一个很奇怪的值
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fixed3 edgeColor = lerp(_DissolveEdgeColor.rgb, _DissolveColor.rgb, saturate(lerpEdge));
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//最终输出颜色的lerp值
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fixed lerpOut = sign(percentage - _ColorFactor);
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//最终颜色在原颜色和上一步计算的颜色之间差值（其实经过saturate（sign（..））的lerpOut应该只能是0或1）
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fixed3 colorOut = lerp(color, edgeColor, saturate(lerpOut));
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return fixed4(colorOut, 1);
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}
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ENDCG
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SubShader
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{
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Tags{ "RenderType" = "Opaque" }
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Pass
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{
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CGPROGRAM
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#pragma vertex vert
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#pragma fragment frag
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ENDCG
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}
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}
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//FallBack "Diffuse"
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}
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