69 lines
2.1 KiB
Plaintext
69 lines
2.1 KiB
Plaintext
Shader "Hidden/glTFExportMetalGloss"
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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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}
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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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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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float4 result = float4(1, 1 - col.a, col.r, 1);
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#ifdef UNITY_COLORSPACE_GAMMA
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#else
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// hack for linear color space, need to figure out
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// right way to sample textures.
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result.xyz = GammaToLinearSpace(result.xyz);
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#endif
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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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