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38 lines
1.1 KiB
38 lines
1.1 KiB
// Copyright (c) <2015> <Playdead>
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// This file is subject to the MIT License as seen in the root of this folder structure (LICENSE.TXT)
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// AUTHOR: Lasse Jon Fuglsang Pedersen <lasse@playdead.com>
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#ifndef __NOISE_CGINC__
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#define __NOISE_CGINC__
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//====
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//note: normalized random, float=[0;1[
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float PDnrand( float2 n ) {
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return frac( sin(dot(n.xy, float2(12.9898f, 78.233f)))* 43758.5453f );
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}
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float2 PDnrand2( float2 n ) {
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return frac( sin(dot(n.xy, float2(12.9898f, 78.233f)))* float2(43758.5453f, 28001.8384f) );
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}
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float3 PDnrand3( float2 n ) {
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return frac( sin(dot(n.xy, float2(12.9898f, 78.233f)))* float3(43758.5453f, 28001.8384f, 50849.4141f ) );
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}
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float4 PDnrand4( float2 n ) {
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return frac( sin(dot(n.xy, float2(12.9898f, 78.233f)))* float4(43758.5453f, 28001.8384f, 50849.4141f, 12996.89f) );
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}
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//====
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//note: signed random, float=[-1;1[
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float PDsrand( float2 n ) {
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return PDnrand( n ) * 2 - 1;
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}
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float2 PDsrand2( float2 n ) {
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return PDnrand2( n ) * 2 - 1;
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}
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float3 PDsrand3( float2 n ) {
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return PDnrand3( n ) * 2 - 1;
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}
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float4 PDsrand4( float2 n ) {
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return PDnrand4( n ) * 2 - 1;
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}
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#endif//__NOISE_CGINC__
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