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53 lines
1.5 KiB
HLSL
53 lines
1.5 KiB
HLSL
/******************************************************************************/
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/*
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Project - MudBun
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Publisher - Long Bunny Labs
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http://LongBunnyLabs.com
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Author - Ming-Lun "Allen" Chou
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http://AllenChou.net
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Based on project "webgl-noise" by Ashima Arts.
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Description : Array and textureless GLSL 2D simplex noise function.
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Author : Ian McEwan, Ashima Arts.
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Maintainer : ijm
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Lastmod : 20110822 (ijm)
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License : Copyright (C) 2011 Ashima Arts. All rights reserved.
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Distributed under the MIT License. See LICENSE file.
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https://github.com/ashima/webgl-noise
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*/
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/******************************************************************************/
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#ifndef MUDBUN_CACHED_NOISE_3D
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#define MUDBUN_CACHED_NOISE_3D
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#include "NoiseCommon.cginc"
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#include "ClassicNoise3D.cginc"
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//#if MUDBUN_IS_COMPUTE_SHADER
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Texture3D noiseCache;
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SamplerState noiseCache_trilinear_repeat_sampler;
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//#else
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//sampler3D noiseCache;
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//#endif
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float4 noiseCacheDimension; // w: unused
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float noiseCacheDensity;
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// range: [-0.5, 0.5]
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float mbn_cached_noise(float3 p)
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{
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float3 unitsPerPeriod = noiseCacheDimension.xyz / noiseCacheDensity;
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p = p / unitsPerPeriod;
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//#if MUDBUN_IS_COMPUTE_SHADER
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return noiseCache.SampleLevel(noiseCache_trilinear_repeat_sampler, p, 0.0f, 0).r;
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//#else
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// return tex3D(noiseCache, p).r;
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//#endif
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}
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// multiple octave
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DEFINE_NOISE_FUNC_MULTIPLE_OCTAVES(mbn_cached_noise, float, float3, 0.5f)
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#endif
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