83 lines
2.2 KiB
Plaintext
83 lines
2.2 KiB
Plaintext
Shader "Hidden/MetalGlossOcclusionChannelSwap"
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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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_SmoothnessRangeMin ("Smoothness Range Min", float) = 0
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_SmoothnessRangeMax ("Smoothness Range Max", float) = 1
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_MetallicRangeMin ("Metallic Range Min", float) = 0
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_MetallicRangeMax ("Metallic Range Max", float) = 1
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_OcclusionRangeMin ("Occlusion Range Min", float) = 0
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_OcclusionRangeMax ("Occlusion Range Max", float) = 1
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}
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SubShader
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{
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// No culling or depth
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Cull Off ZWrite Off ZTest Always
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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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#include "UnityCG.cginc"
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struct appdata
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{
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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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float2 uv : TEXCOORD0;
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float4 vertex : SV_POSITION;
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};
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v2f vert (appdata v)
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{
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v2f o;
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o.vertex = UnityObjectToClipPos(v.vertex);
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o.uv = v.uv;
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return o;
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}
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sampler2D _MainTex;
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float _MetallicRangeMin;
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float _MetallicRangeMax;
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float _SmoothnessRangeMin;
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float _SmoothnessRangeMax;
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float _OcclusionRangeMin;
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float _OcclusionRangeMax;
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float4 frag (v2f i) : SV_Target
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{
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float4 col = tex2D(_MainTex, i.uv);
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// From the GLTF 2.0 spec
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// The metallic-roughness texture. The metalness values are sampled from the B channel.
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// The roughness values are sampled from the G channel. These values are linear.
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// If other channels are present (R or A), they are ignored for metallic-roughness calculations.
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//
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// Unity, by default, puts metallic in R channel and glossiness in A channel.
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// Unity uses a metallic-gloss texture so we need to invert the value in the g channel.
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//
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// Conversion Summary
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// Unity R channel goes into B channel
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// Unity A channel goes into G channel, then inverted
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// Unity G channel goes into R channel > Occlusion
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float4 result = float4(
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_OcclusionRangeMin + col.g * (_OcclusionRangeMax - _OcclusionRangeMin),
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1 - (_SmoothnessRangeMin + col.a * (_SmoothnessRangeMax - _SmoothnessRangeMin)),
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_MetallicRangeMin + col.r * (_MetallicRangeMax - _MetallicRangeMin),
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0);
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return result;
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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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