57 lines
2.4 KiB
HLSL
57 lines
2.4 KiB
HLSL
// SPDX-License-Identifier: (Not available for this version, you are only allowed to use this software if you have express permission from the copyright holder and agreed to the latest NiloToonURP EULA)
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// Copyright (c) 2021 Kuroneko ShaderLab Limited
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// For more information, visit -> https://github.com/ColinLeung-NiloCat/UnityURPToonLitShaderExample
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// #pragma once is a safe guard best practice in almost every .hlsl,
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// doing this can make sure your .hlsl's user can include this .hlsl anywhere anytime without producing any multi include conflict
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#pragma once
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void NiloDoDitherFadeoutClip(float2 SV_POSITIONxy, float ditherOpacity)
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{
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// copy from https://docs.unity3d.com/Packages/com.unity.shadergraph@10.3/manual/Dither-Node.html?q=dither
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float DITHER_THRESHOLDS[16] =
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{
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1.0 / 17.0, 9.0 / 17.0, 3.0 / 17.0, 11.0 / 17.0,
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13.0 / 17.0, 5.0 / 17.0, 15.0 / 17.0, 7.0 / 17.0,
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4.0 / 17.0, 12.0 / 17.0, 2.0 / 17.0, 10.0 / 17.0,
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16.0 / 17.0, 8.0 / 17.0, 14.0 / 17.0, 6.0 / 17.0
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};
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uint index = (uint(SV_POSITIONxy.x) % 4) * 4 + uint(SV_POSITIONxy.y) % 4;
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clip(ditherOpacity - DITHER_THRESHOLDS[index]);
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}
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// this will work for iPhone15Pro, but the original function wont, why? must be due to % or array.
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/*
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void NiloDoDitherFadeoutClip(float2 SV_POSITIONxy, float ditherOpacity)
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{
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// Use integer coordinates
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int x = int(SV_POSITIONxy.x) & 3; // Using bitwise AND instead of modulo
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int y = int(SV_POSITIONxy.y) & 3;
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// Calculate threshold without array
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float threshold;
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int index = x * 4 + y;
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// Unroll the array access
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if (index == 0) threshold = 1.0 / 17.0;
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else if (index == 1) threshold = 9.0 / 17.0;
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else if (index == 2) threshold = 3.0 / 17.0;
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else if (index == 3) threshold = 11.0 / 17.0;
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else if (index == 4) threshold = 13.0 / 17.0;
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else if (index == 5) threshold = 5.0 / 17.0;
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else if (index == 6) threshold = 15.0 / 17.0;
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else if (index == 7) threshold = 7.0 / 17.0;
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else if (index == 8) threshold = 4.0 / 17.0;
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else if (index == 9) threshold = 12.0 / 17.0;
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else if (index == 10) threshold = 2.0 / 17.0;
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else if (index == 11) threshold = 10.0 / 17.0;
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else if (index == 12) threshold = 16.0 / 17.0;
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else if (index == 13) threshold = 8.0 / 17.0;
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else if (index == 14) threshold = 14.0 / 17.0;
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else threshold = 6.0 / 17.0;
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clip(ditherOpacity - threshold);
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}
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*/
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