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51 lines
1.1 KiB
51 lines
1.1 KiB
3 years ago
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// Colorful FX - Unity Asset
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// Copyright (c) 2015 - Thomas Hourdel
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// http://www.thomashourdel.com
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Shader "Hidden/Colorful/Contrast Gain"
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{
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Properties
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{
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_MainTex ("Base (RGB)", 2D) = "white" {}
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_Gain ("Contrast Gain (Float)", Float) = 1.0
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}
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SubShader
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{
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ZTest Always Cull Off ZWrite Off
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Fog { Mode off }
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Pass
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{
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CGPROGRAM
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#pragma vertex vert_img
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#pragma fragment frag
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#pragma fragmentoption ARB_precision_hint_fastest
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#include "UnityCG.cginc"
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sampler2D _MainTex;
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half _Gain;
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half4 frag(v2f_img i) : SV_Target
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{
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half4 color = saturate(tex2D(_MainTex, i.uv));
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half g = pow(2.0, _Gain) * 0.5;
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// The following code fails for some reason on Unity 4.6/DX9
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//color.rgb = (color.rgb < 0.5) ? pow(color.rgb, _Gain) * g : 1.0 - pow(1.0 - color.rgb, _Gain) * g;
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// So use a classic lerp/step combo instead
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half3 c1 = pow(color.rgb, _Gain) * g;
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half3 c2 = 1.0 - pow(1.0 - color.rgb, _Gain) * g;
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color.rgb = lerp(c1, c2, step(0.5, color.rgb));
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return color;
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}
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ENDCG
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}
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}
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FallBack off
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}
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